/* ═══════════════════════════════ Token ═══════════════════════════════ */
:root {
    --bg: #0e1220;
    --bg-2: #12172a;
    --panel: #171c2e;
    --panel-2: #1e253b;
    --panel-3: #283049;
    --border: #2d3650;
    --border-soft: var(--line-strong);
    --text: var(--svg-text);
    --text-strong: #f8fafc;
    --muted: #93a0bd;
    --faint: #6d7a96;

    --primary: #818cf8;
    --primary-2: #a5b4fc;
    --primary-soft: rgba(129, 140, 248, 0.16);
    --cyan: #2dd4bf;
    --cyan-soft: rgba(45, 212, 191, 0.14);
    --amber: #f59e0b;
    --amber-soft: rgba(245, 158, 11, 0.16);
    --green: #22c55e;
    --green-soft: rgba(34, 197, 94, 0.14);
    --red: #ef4444;
    --red-soft: rgba(239, 68, 68, 0.14);
    --pink: #ec4899;

    --easy: #22c55e;
    --medium: #f59e0b;
    --hard: #ef4444;

    --grad-graph: #14b8a6;
    --grad-dp: #f59e0b;
    --grad-primary: #3730a3;

    --radius: 10px;
    --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
    --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
    --shadow: 0 20px 50px rgba(0, 0, 0, 0.45);

    --canvas: #0c1018;
    --code-bg: #1e1e1e;
    --code-text: #d4d4d4;
    --code-inline: #ce9178;
    --text-soft: #cfd5e3;
    --svg-text: #e6e9f2;
    --panel-deep: #141a27;
    --line-strong: #2d3650;
    --edge: #3d4864;
    --hl-text: #fde68a;
    --hl-fill: #fff7d6;
    --violet-fill: #ddd6fe;
    --on-amber: #1a1300;
    --red-text: #fca5a5;
    --green-text: #bbf7d0;
    --violet-text: #c4b5fd;
    --amber-text: #fcd34d;
    --blocked-a: #2a1416;
    --blocked-b: #341a1d;
    --tint-rgb: 255, 255, 255;
    --glass-rgb: 20, 25, 36;
    --node-a: #2c3753;
    --node-b: #151b29;
    --node-text: #ffffff;

    /* Warna sintaks kode */
    --syn-comment: #6a9955;
    --syn-keyword: #569cd6;
    --syn-string: #ce9178;
    --syn-number: #b5cea8;
    --syn-type: #4ec9b0;
    --syn-title: #dcdcaa;
    --syn-meta: #c586c0;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
}

html {
    overflow-x: clip;
}

body {
    background: var(--bg);
    color: var(--text);
    font: 14px/1.6 var(--sans);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font: inherit;
    color: inherit;
    cursor: pointer;
}

button:disabled {
    cursor: not-allowed;
}

code,
kbd,
pre,
textarea.mono {
    font-family: var(--mono);
    font-variant-ligatures: none;
}

[hidden] {
    display: none !important;
}

::selection {
    background: rgba(79, 70, 229, 0.28);
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--panel-2);
    border-radius: 10px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--edge);
}

::-webkit-scrollbar-track,
::-webkit-scrollbar-corner {
    background: transparent;
}

.muted {
    color: var(--muted);
}

.faint {
    color: var(--faint);
}

.mono {
    font-family: var(--mono);
}

.nowrap {
    white-space: nowrap;
}

.link {
    color: var(--primary-2);
    font-weight: 500;
}

.link:hover {
    text-decoration: underline;
}

.grad-text {
    background: var(--grad-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.grad-graph-text {
    background: var(--grad-graph);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.grad-dp-text {
    background: var(--grad-dp);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse {
    50% {
        opacity: 0.55;
    }
}

/* ═══════════════════════════════ Topbar ═══════════════════════════════ */
.topbar {
    position: sticky;
    top: 0;
    left: 0;
    z-index: 40;
    width: 100vw;
    max-width: 100vw;
    height: 56px;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 12px;
    background: rgba(var(--glass-rgb), 0.82);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-soft);
}

.topbar-left,
.topbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}

.topbar-right {
    justify-content: flex-end;
}

.topbar-center {
    display: flex;
    gap: 6px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 17px;
    letter-spacing: -0.02em;
    color: var(--text-strong);
    flex: none;
}

.logo-mark {
    width: 30px;
    height: 30px;
    flex: none;
}

.logo-text span {
    color: inherit;
}

.main-nav {
    display: flex;
    gap: 2px;
    margin-left: 22px;
}

.main-nav a {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 12px;
    border-radius: 8px;
    color: var(--muted);
    font-weight: 500;
    transition:
        color 0.15s,
        background 0.15s;
}

.main-nav a svg {
    opacity: 0.8;
}

.main-nav a:hover {
    color: var(--text);
    background: var(--panel-2);
}

.main-nav a.active {
    color: var(--text-strong);
    background: var(--panel-2);
}

.divider {
    width: 1px;
    height: 20px;
    margin: 0 6px;
    background: var(--border);
}

/* User menu */
.user-menu {
    position: relative;
}

.user-menu summary {
    display: flex;
    align-items: center;
    gap: 8px;
    height: 36px;
    padding: 0 10px 0 4px;
    border-radius: 999px;
    list-style: none;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.15s;
}

.user-menu summary::-webkit-details-marker {
    display: none;
}

.user-menu summary:hover,
.user-menu[open] summary {
    background: var(--panel-2);
}

.avatar {
    display: inline-grid;
    place-items: center;
    width: 28px;
    height: 28px;
    flex: none;
    border-radius: 50%;
    background: var(--grad-primary);
    color: #fff;
    font-weight: 700;
    font-size: 12px;
}

.avatar.lg {
    width: 40px;
    height: 40px;
    font-size: 16px;
}

.user-dropdown {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    width: 240px;
    padding: 6px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow);
    animation: fadeIn 0.15s ease;
    z-index: 50;
}

.user-dropdown-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px 12px;
    margin-bottom: 4px;
    border-bottom: 1px solid var(--border-soft);
}

.user-dropdown-head strong {
    display: block;
    color: var(--text-strong);
}

.user-dropdown-head small {
    color: var(--muted);
    font-size: 12px;
}

.user-dropdown a,
.user-dropdown button {
    display: block;
    width: 100%;
    padding: 8px 10px;
    border: 0;
    border-radius: 7px;
    background: none;
    text-align: left;
}

.user-dropdown a:hover,
.user-dropdown button:hover {
    background: var(--panel-2);
}

.user-dropdown form {
    margin-top: 4px;
    padding-top: 4px;
    border-top: 1px solid var(--border-soft);
}

.user-dropdown .logout {
    color: var(--red-text);
}

/* ═══════════════════════════════ Buttons ═══════════════════════════════ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    height: 34px;
    padding: 0 14px;
    border: 0;
    border-radius: 8px;
    background: var(--panel-2);
    color: var(--text);
    font-weight: 600;
    font-size: 13.5px;
    white-space: nowrap;
    transition:
        background 0.15s,
        color 0.15s,
        border-color 0.15s,
        transform 0.1s,
        box-shadow 0.15s,
        opacity 0.15s;
}

.btn:hover {
    background: var(--panel-3);
}

.btn:active {
    transform: translateY(1px);
}

.btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.btn:disabled,
.btn.disabled {
    opacity: 0.4;
    pointer-events: none;
}

.btn-primary {
    background: #3730a3;
    color: #fff;
    box-shadow: none;
}

.btn-primary:hover {
    background: #2e2880;
    box-shadow: none;
}

.btn-success {
    background: var(--green);
    color: #04210f;
}

.btn-success:hover {
    background: #34d070;
}

.btn-ghost {
    background: transparent;
    color: var(--muted);
}

.btn-ghost:hover {
    background: var(--panel-2);
    color: var(--text);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
}

.btn-outline:hover {
    background: transparent;
    border-color: var(--primary);
    color: var(--primary-2);
}

.btn-icon {
    width: 34px;
    padding: 0;
    background: transparent;
    color: var(--muted);
}

.btn-icon:hover {
    color: var(--text);
    background: var(--panel-2);
}

.btn-lg {
    height: 46px;
    padding: 0 22px;
    font-size: 15px;
    border-radius: 10px;
}

.btn-sm {
    height: 28px;
    padding: 0 10px;
    font-size: 12.5px;
    border-radius: 7px;
}

.btn-block {
    width: 100%;
}

.btn.loading {
    opacity: 0.75;
    pointer-events: none;
}

.btn.loading svg {
    animation: spin 0.9s linear infinite;
}

/* ═══════════════════════════════ Pills & badges ═══════════════════════════════ */
.pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 24px;
    padding: 0 10px;
    border-radius: 999px;
    background: var(--panel-2);
    color: var(--muted);
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
}

.pill-graph {
    color: var(--cyan);
    background: var(--cyan-soft);
}

.pill-dp {
    color: var(--amber);
    background: var(--amber-soft);
}

.diff {
    font-weight: 600;
    font-size: 12.5px;
}

.diff.easy {
    color: var(--easy);
}

.diff.medium {
    color: var(--medium);
}

.diff.hard {
    color: var(--hard);
}

.diff-pill.easy {
    color: var(--easy);
    background: var(--green-soft);
}

.diff-pill.medium {
    color: var(--medium);
    background: var(--amber-soft);
}

.diff-pill.hard {
    color: var(--hard);
    background: var(--red-soft);
}

.tag {
    display: inline-block;
    padding: 1px 8px;
    border-radius: 6px;
    background: var(--panel-2);
    color: var(--muted);
    font-size: 12px;
}

.verdict {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 700;
}

.verdict-AC {
    color: var(--green);
}

.verdict-WA {
    color: var(--red);
}

.verdict-TLE {
    color: var(--amber);
}

.verdict-RE {
    color: #f472b6;
}

.verdict-CE {
    color: #fb923c;
}

.score-chip {
    display: inline-block;
    min-width: 38px;
    padding: 1px 8px;
    border-radius: 999px;
    font: 700 12px var(--mono);
    text-align: center;
    color: var(--muted);
    background: var(--panel-2);
}

.score-chip.full {
    color: var(--green);
    background: var(--green-soft);
}

.score-chip.part {
    color: var(--amber);
    background: var(--amber-soft);
}

.status-dot {
    display: inline-block;
    width: 18px;
    height: 18px;
    flex: none;
    border-radius: 50%;
    border: 1.5px dashed var(--faint);
    vertical-align: middle;
}

.status-dot.done {
    border: 0;
    background: var(--green)
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E")
        center / 11px no-repeat;
}

.status-dot.part {
    border: 2px solid var(--amber);
    background: conic-gradient(var(--amber) 0 50%, transparent 50%);
}

/* ═══════════════════════════════ Layout umum ═══════════════════════════════ */
.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 32px 20px 72px;
}

.card {
    background: var(--panel);
    border: 1px solid var(--border-soft);
    border-radius: 14px;
}

.page-head {
    margin-bottom: 22px;
}

.page-head h1 {
    margin: 0 0 4px;
    font-size: 28px;
    letter-spacing: -0.02em;
    color: var(--text-strong);
}

.page-head p {
    margin: 0;
    color: var(--muted);
}

.flash {
    margin-bottom: 20px;
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid rgba(34, 197, 94, 0.3);
    background: var(--green-soft);
    color: var(--green-text);
}

.empty {
    padding: 48px 16px;
    margin: 0;
    text-align: center;
    color: var(--muted);
}

/* ═══════════════════════════════ Beranda ═══════════════════════════════ */
.hero {
    position: relative;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 28px;
    align-items: center;
    padding: 32px;
    margin-bottom: 36px;
    border-radius: 20px;
    overflow: hidden;
    background: var(--panel);
    border: 1px solid var(--border-soft);
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--primary-2);
    font-weight: 600;
}

.hero h1 {
    margin: 0 0 14px;
    font-size: clamp(30px, 4vw, 44px);
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--text-strong);
}

.hero p.lead {
    margin: 0 0 22px;
    max-width: 52ch;
    color: var(--muted);
    font-size: 15px;
}

.hero-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 22px;
    margin-top: 26px;
    flex-wrap: wrap;
}

.hero-stats div b {
    display: block;
    font-size: 22px;
    color: var(--text-strong);
    line-height: 1.2;
}

.hero-stats div small {
    color: var(--muted);
    font-size: 12px;
}

.hero-visual {
    position: relative;
    aspect-ratio: 16 / 11;
    border-radius: 16px;
    background: rgba(var(--glass-rgb), 0.55);
    border: 1px solid var(--border);
    overflow: hidden;
}

.hero-visual svg {
    width: 100%;
    height: 100%;
    display: block;
}

.hv-edge {
    stroke: var(--line-strong);
    stroke-width: 2.5;
}

.hv-edge.lit {
    stroke: var(--primary);
    stroke-width: 3;
    animation: hvEdge 6s infinite;
}

.hv-node circle {
    fill: var(--panel-deep);
    stroke: var(--edge);
    stroke-width: 2;
}

.hv-node text {
    fill: var(--svg-text);
    font: 700 13px var(--mono);
    text-anchor: middle;
    dominant-baseline: central;
}

.hv-node.wave circle,
.hv-node.wave text {
    animation-duration: 6s;
    animation-timing-function: ease;
    animation-iteration-count: infinite;
    animation-delay: var(--d);
}

.hv-node.wave circle {
    animation-name: hvNode;
}

.hv-node.wave text {
    animation-name: hvNodeText;
}

@keyframes hvNode {
    0%,
    8% {
        fill: #ffffff;
        stroke: #c7d2fe;
    }

    12%,
    70% {
        fill: #3730a3;
        stroke: #3730a3;
    }

    100% {
        fill: #ffffff;
        stroke: #c7d2fe;
    }
}

@keyframes hvNodeText {
    0%,
    8% {
        fill: #312e81;
    }

    12%,
    70% {
        fill: #ffffff;
    }

    100% {
        fill: #312e81;
    }
}

@keyframes hvEdge {
    0%,
    10% {
        stroke-opacity: 0.15;
    }

    25%,
    70% {
        stroke-opacity: 1;
    }

    100% {
        stroke-opacity: 0.15;
    }
}

.hv-grid {
    position: absolute;
    right: 14px;
    bottom: 14px;
    display: grid;
    grid-template-columns: repeat(5, 22px);
    gap: 3px;
    padding: 8px;
    border-radius: 12px;
    background: #fff;
    border: 1px solid #e0e7ff;
    box-shadow: none;
}

.hv-grid span {
    display: grid;
    place-items: center;
    height: 22px;
    border-radius: 6px;
    background: var(--panel-2);
    color: transparent;
    font: 700 11px var(--mono);
    animation: hvCell 7s infinite;
    animation-delay: var(--d);
}

@keyframes hvCell {
    0%,
    5% {
        background: #eef2ff;
        color: #312e81;
    }

    12%,
    80% {
        background: #3730a3;
        color: #fff;
    }

    100% {
        background: #eef2ff;
        color: #312e81;
    }
}

.hv-label {
    position: absolute;
    left: 16px;
    top: 14px;
    display: flex;
    gap: 8px;
}

/* Roadmap */
.track {
    margin-bottom: 40px;
}

.track-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}

.track-title {
    display: flex;
    align-items: center;
    gap: 14px;
}

.track-icon {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    color: #fff;
    box-shadow: none;
}

.track-graph .track-icon {
    background: var(--grad-graph);
}

.track-dp .track-icon {
    background: var(--grad-dp);
}

.track-title h2 {
    margin: 0;
    font-size: 22px;
    letter-spacing: -0.02em;
    color: var(--text-strong);
}

.track-title p {
    margin: 0;
    color: var(--muted);
}

.track-progress {
    min-width: 240px;
}

.track-progress-text {
    display: flex;
    justify-content: space-between;
    font-size: 12.5px;
    color: var(--muted);
    margin-bottom: 6px;
}

.track-progress-text b {
    color: var(--text-strong);
}

.bar {
    height: 6px;
    border-radius: 6px;
    background: var(--panel-3);
    overflow: hidden;
}

.bar i {
    display: block;
    height: 100%;
    border-radius: 6px;
    transition: width 0.8s ease;
}

.track-graph .bar i {
    background: var(--grad-graph);
}

.track-dp .bar i {
    background: var(--grad-dp);
}

.roadmap {
    position: relative;
    display: grid;
    gap: 12px;
    padding-left: 34px;
}

.roadmap::before {
    content: "";
    position: absolute;
    left: 13px;
    top: 16px;
    bottom: 16px;
    width: 2px;
    border-radius: 2px;
    background: var(--border);
}

.lesson-card {
    position: relative;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 16px;
    align-items: center;
    padding: 18px 20px;
    border-radius: 14px;
    background: var(--panel);
    border: 1px solid var(--border-soft);
    transition:
        border-color 0.2s,
        transform 0.2s,
        background 0.2s;
}

.lesson-card:hover {
    border-color: var(--border);
    background: var(--panel-2);
    transform: translateX(3px);
}

.lesson-card .node {
    position: absolute;
    left: -30px;
    top: 50%;
    width: 20px;
    height: 20px;
    margin-top: -10px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--faint);
}

.lesson-card.done .node {
    border: 0;
    background: var(--green)
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E")
        center / 11px no-repeat;
}

.lesson-card.next .node {
    border-color: var(--primary);
    box-shadow: 0 0 0 5px var(--primary-soft);
}

.lesson-card.next {
    border-color: #c7d2fe;
}

.lesson-card h3 {
    margin: 0 0 2px;
    font-size: 16px;
    color: var(--text-strong);
}

.lesson-card p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
}

.lesson-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 10px;
}

.lesson-problem {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 2px 9px 2px 3px;
    border-radius: 999px;
    background: var(--panel-2);
    font-size: 12px;
    color: var(--text);
}

.lesson-problem .status-dot {
    width: 16px;
    height: 16px;
}

.lesson-cta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
}

/* ═══════════════════════════════ Halaman materi ═══════════════════════════════ */
.lesson-layout {
    display: block;
    max-width: 1080px;
    margin: 0 auto;
    padding: 28px 20px 80px;
}

.lesson-aside {
    position: sticky;
    top: 80px;
    align-self: start;
    max-height: calc(100vh - 100px);
    overflow: auto;
}

.aside-title {
    margin: 0 0 8px;
    color: var(--faint);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.toc {
    list-style: none;
    margin: 0 0 24px;
    padding: 0;
    border-left: 1px solid var(--border);
}

.toc a {
    display: block;
    margin-left: -1px;
    padding: 5px 0 5px 14px;
    border-left: 2px solid transparent;
    color: var(--muted);
    font-size: 13px;
    transition:
        color 0.15s,
        border-color 0.15s;
}

.toc a:hover {
    color: var(--text);
}

.toc a.active {
    color: var(--text-strong);
    border-left-color: var(--primary);
}

.track-nav {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 2px;
}

.track-nav a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 10px;
    border-radius: 8px;
    color: var(--muted);
    font-size: 13px;
}

.track-nav a:hover {
    background: var(--panel-2);
    color: var(--text);
}

.track-nav a.current {
    background: var(--panel-2);
    color: var(--text-strong);
}

.track-nav .status-dot {
    width: 14px;
    height: 14px;
}

.lesson-main {
    min-width: 0;
}

.lesson-hero {
    padding-bottom: 22px;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--border-soft);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    color: var(--muted);
    font-size: 13px;
}

.breadcrumb a:hover {
    color: var(--text);
}

.lesson-hero h1 {
    margin: 0 0 6px;
    font-size: clamp(28px, 3.6vw, 40px);
    letter-spacing: -0.03em;
    line-height: 1.15;
    color: var(--text-strong);
}

.lesson-hero .subtitle {
    margin: 0 0 14px;
    font-size: 17px;
    color: var(--muted);
}

.lesson-hero .meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.lesson-section {
    padding: 30px 0 6px;
    scroll-margin-top: 70px;
}

.lesson-section > h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 14px;
    font-size: 22px;
    letter-spacing: -0.02em;
    color: var(--text-strong);
}

.lesson-section > h2 .sec-icon {
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    border-radius: 9px;
    background: var(--primary-soft);
    color: var(--primary-2);
    font-size: 16px;
}

.prose {
    max-width: 76ch;
    color: var(--text-soft);
    font-size: 15px;
    line-height: 1.75;
}

.prose p {
    margin: 0 0 14px;
}

.prose strong {
    color: var(--text-strong);
}

.prose ul,
.prose ol {
    margin: 0 0 14px;
    padding-left: 22px;
}

.prose li {
    margin-bottom: 6px;
}

.prose code,
.statement code,
.callout code,
.step-card code,
.quiz code {
    padding: 1px 6px;
    border-radius: 5px;
    background: var(--panel-3);
    border: 1px solid var(--border);
    color: var(--code-inline);
    font-size: 0.88em;
}

.callout {
    display: flex;
    gap: 12px;
    max-width: 76ch;
    margin: 6px 0 18px;
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--panel);
    font-size: 14.5px;
    line-height: 1.65;
}

.callout-icon {
    flex: none;
    font-size: 18px;
    line-height: 1.4;
}

.callout.tip {
    border-color: rgba(34, 211, 238, 0.35);
    background: linear-gradient(0deg, var(--cyan-soft), var(--cyan-soft)), var(--panel);
}

.callout.warn {
    border-color: rgba(245, 158, 11, 0.4);
    background: linear-gradient(0deg, var(--amber-soft), var(--amber-soft)), var(--panel);
}

.callout.key {
    border-color: rgba(139, 92, 246, 0.45);
    background: linear-gradient(0deg, var(--primary-soft), var(--primary-soft)), var(--panel);
}

.callout p {
    margin: 0;
}

.term-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 10px;
    margin: 6px 0 18px;
}

.term {
    padding: 14px;
    border-radius: 12px;
    background: var(--panel);
    border: 1px solid var(--border-soft);
}

.term b {
    display: block;
    margin-bottom: 4px;
    color: var(--text-strong);
}

.term span {
    color: var(--muted);
    font-size: 13px;
}

/* Langkah pengerjaan */
.steps {
    counter-reset: step;
    display: grid;
    gap: 10px;
    max-width: 80ch;
    margin: 4px 0 18px;
}

.step-card {
    position: relative;
    padding: 14px 16px 14px 56px;
    border-radius: 12px;
    background: var(--panel);
    border: 1px solid var(--border-soft);
    font-size: 14.5px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 14px;
    top: 13px;
    display: grid;
    place-items: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--grad-primary);
    color: #fff;
    font: 700 13px var(--mono);
}

.step-card b {
    display: block;
    color: var(--text-strong);
    margin-bottom: 2px;
}

.step-card span {
    color: var(--muted);
}

/* Tabel kompleksitas */
.cx-table {
    width: 100%;
    max-width: 640px;
    margin: 4px 0 18px;
    border-collapse: separate;
    border-spacing: 0;
    border: 1px solid var(--border-soft);
    border-radius: 12px;
    overflow: hidden;
    font-size: 14px;
}

.cx-table th,
.cx-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border-soft);
}

.cx-table th {
    background: var(--panel-2);
    color: var(--muted);
    font-weight: 600;
    font-size: 12.5px;
}

.cx-table tr:last-child td {
    border-bottom: 0;
}

.cx-table td:first-child {
    color: var(--text);
}

.cx-table code {
    color: var(--cyan);
    font-weight: 600;
}

/* Kode */
.code-tabs {
    max-width: 90ch;
    margin: 6px 0 18px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--code-bg);
    overflow: hidden;
}

.code-tabs-head {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 6px;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
}

.code-tab {
    height: 28px;
    padding: 0 12px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--muted);
    font-size: 12.5px;
    font-weight: 600;
}

.code-tab.active {
    background: var(--panel-3);
    color: var(--text-strong);
}

.code-copy {
    margin-left: auto;
}

.code-tabs pre {
    margin: 0;
    padding: 16px 18px;
    overflow: auto;
    font-size: 13px;
    line-height: 1.65;
    background: transparent !important;
}

.code-tabs pre code {
    background: transparent;
    border: 0;
    padding: 0;
    color: var(--code-text);
}

/* Kuis */
.quiz {
    max-width: 80ch;
    margin: 6px 0 18px;
    padding: 18px;
    border-radius: 14px;
    background: var(--panel);
    border: 1px solid var(--border-soft);
}

.quiz-q {
    margin: 0 0 12px;
    color: var(--text-strong);
    font-weight: 600;
    font-size: 15px;
}

.quiz-options {
    display: grid;
    gap: 8px;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--panel-2);
    text-align: left;
    transition:
        border-color 0.15s,
        background 0.15s;
}

.quiz-option:hover {
    border-color: var(--primary);
}

.quiz-option.correct {
    border-color: var(--green);
    background: var(--green-soft);
}

.quiz-option.wrong {
    border-color: var(--red);
    background: var(--red-soft);
}

.quiz-feedback {
    margin: 12px 0 0;
    font-size: 14px;
}

.quiz + .quiz {
    margin-top: 12px;
}

/* Latihan */
.practice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 12px;
    margin: 6px 0 20px;
}

.practice-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 18px;
    border-radius: 14px;
    background: var(--panel);
    border: 1px solid var(--border-soft);
    transition:
        border-color 0.2s,
        transform 0.2s;
}

.practice-card:hover {
    border-color: rgba(139, 92, 246, 0.5);
    transform: translateY(-2px);
}

.practice-card h3 {
    margin: 0;
    font-size: 16px;
    color: var(--text-strong);
}

.practice-card p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
}

.practice-card .row {
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: space-between;
}

.lesson-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 30px;
    padding-top: 22px;
    border-top: 1px solid var(--border-soft);
}

.complete-box {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    border-radius: 14px;
    background: var(--panel);
    border: 1px solid var(--border-soft);
}

.complete-box.is-done {
    border-color: rgba(34, 197, 94, 0.4);
    background: linear-gradient(0deg, var(--green-soft), var(--green-soft)), var(--panel);
}

.nav-lesson {
    display: flex;
    flex-direction: column;
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid var(--border-soft);
    background: var(--panel);
    min-width: 200px;
}

.nav-lesson:hover {
    border-color: var(--border);
}

.nav-lesson small {
    color: var(--muted);
    font-size: 12px;
}

.nav-lesson b {
    color: var(--text-strong);
}

.nav-lesson.next {
    text-align: right;
}

/* ═══════════════════════════════ Visualizer ═══════════════════════════════ */
.viz {
    margin: 8px 0 22px;
    border-radius: 18px;
    background: var(--panel);
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.35);
}

.viz-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-soft);
    background: var(--bg-2);
}

.viz-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    color: var(--text-strong);
}

.viz-title .live {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 0 4px var(--green-soft);
}

.viz-controls-top {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.viz-input {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 32px;
    padding: 0 4px 0 10px;
    border-radius: 8px;
    background: var(--panel-2);
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 12.5px;
}

.viz-input input,
.viz-input select {
    height: 26px;
    border: 0;
    border-radius: 6px;
    background: var(--panel-3);
    color: var(--text-strong);
    font: 600 12.5px var(--mono);
    padding: 0 8px;
    outline: none;
}

.viz-input input {
    width: 120px;
}

.viz-input input.short {
    width: 52px;
}

.viz-input input:focus,
.viz-input select:focus {
    box-shadow: 0 0 0 2px var(--primary);
}

.segmented {
    display: inline-flex;
    padding: 3px;
    border-radius: 9px;
    background: var(--panel-2);
    border: 1px solid var(--border);
}

.segmented button {
    height: 26px;
    padding: 0 10px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--muted);
    font-size: 12.5px;
    font-weight: 600;
}

.segmented button.active {
    background: var(--panel-3);
    color: var(--text-strong);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.viz-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    min-height: 420px;
}

.viz-stage {
    position: relative;
    min-width: 0;
    padding: 12px;
    background:
        radial-gradient(circle at 1px 1px, rgba(var(--tint-rgb), 0.05) 1px, transparent 0) 0 0 / 22px 22px,
        var(--canvas);
    overflow: auto;
}

.viz-stage svg.graph {
    display: block;
    width: 100%;
    height: auto;
    max-height: 460px;
    user-select: none;
}

.viz-side {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 14px;
    border-left: 1px solid var(--border-soft);
    background: var(--panel);
    min-width: 0;
    overflow: auto;
    max-height: 520px;
}

.viz-panel h4 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0 0 8px;
    color: var(--faint);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.viz-panel h4 small {
    color: var(--muted);
    font-size: 11px;
    letter-spacing: 0;
    text-transform: none;
    font-weight: 500;
}

/* Pseudocode */
.pseudo {
    margin: 0;
    padding: 8px 0;
    border-radius: 10px;
    background: var(--canvas);
    border: 1px solid var(--border-soft);
    font: 12.5px/1.75 var(--mono);
    counter-reset: line;
    overflow-x: auto;
}

.pseudo div {
    position: relative;
    padding: 0 10px 0 36px;
    white-space: pre;
    color: var(--muted);
    transition:
        background 0.2s,
        color 0.2s;
}

.pseudo div::before {
    counter-increment: line;
    content: counter(line);
    position: absolute;
    left: 0;
    width: 24px;
    text-align: right;
    color: var(--line-strong);
}

.pseudo div.on {
    background: rgba(245, 158, 11, 0.13);
    color: var(--hl-text);
    box-shadow: inset 3px 0 0 var(--amber);
}

.pseudo .kw {
    color: var(--violet-text);
}

.pseudo div.on .kw {
    color: var(--amber-text);
}

/* Struktur data */
.ds-items {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    min-height: 36px;
    padding: 6px;
    border-radius: 10px;
    background: var(--canvas);
    border: 1px dashed var(--border);
}

.ds-items.is-empty::after {
    content: "kosong";
    align-self: center;
    padding: 0 6px;
    color: var(--faint);
    font-size: 12px;
    font-style: italic;
}

.ds-item {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 34px;
    padding: 0 8px;
    border-radius: 8px;
    background: var(--panel-3);
    border: 1px solid var(--line-strong);
    color: var(--text-strong);
    font: 700 13px var(--mono);
    line-height: 1.1;
    animation: dsIn 0.3s cubic-bezier(0.2, 0.8, 0.3, 1.3);
}

.ds-item small {
    color: var(--muted);
    font-size: 9.5px;
    font-weight: 600;
}

.ds-item.hot {
    background: var(--amber-soft);
    border-color: var(--amber);
    color: var(--hl-text);
}

.ds-item.new {
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px var(--cyan-soft);
}

.ds-item.done {
    background: var(--primary-soft);
    border-color: rgba(167, 139, 250, 0.55);
}

@keyframes dsIn {
    from {
        transform: scale(0.6);
        opacity: 0;
    }
}

.ds-arrow {
    display: flex;
    justify-content: space-between;
    margin-top: 4px;
    color: var(--faint);
    font-size: 10.5px;
}

/* Array dist / tabel kecil */
.dist-table {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(44px, 1fr));
    gap: 4px;
}

.dist-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4px 2px;
    border-radius: 8px;
    background: var(--canvas);
    border: 1px solid var(--border-soft);
    transition:
        background 0.25s,
        border-color 0.25s;
}

.dist-cell small {
    color: var(--faint);
    font: 600 10px var(--mono);
}

.dist-cell b {
    color: var(--text-strong);
    font: 700 13px var(--mono);
}

.dist-cell.inf b {
    color: var(--faint);
}

.dist-cell.changed {
    border-color: var(--cyan);
    background: var(--cyan-soft);
}

.dist-cell.final {
    border-color: rgba(167, 139, 250, 0.5);
}

/* Adjacency list & matrix */
.adj-list {
    display: grid;
    gap: 3px;
    font: 12.5px var(--mono);
}

.adj-row {
    display: flex;
    align-items: center;
    gap: 6px;
    min-height: 26px;
    padding: 2px 6px;
    border-radius: 6px;
    transition: background 0.2s;
}

.adj-row.hot {
    background: var(--amber-soft);
}

.adj-row .head {
    display: grid;
    place-items: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--panel-3);
    color: var(--text-strong);
    font-weight: 700;
}

.adj-row .arrow {
    color: var(--faint);
}

.adj-row .nb {
    padding: 0 6px;
    border-radius: 5px;
    background: var(--panel-2);
    color: var(--text);
    animation: dsIn 0.3s ease;
}

.adj-row .nb.new {
    background: var(--cyan-soft);
    color: var(--cyan);
}

.matrix {
    border-collapse: collapse;
    font: 12px var(--mono);
}

.matrix th {
    width: 26px;
    height: 22px;
    color: var(--faint);
    font-weight: 600;
}

.matrix td {
    width: 26px;
    height: 24px;
    text-align: center;
    border: 1px solid var(--border-soft);
    color: var(--line-strong);
    transition:
        background 0.25s,
        color 0.25s;
}

.matrix td.one {
    color: var(--text-strong);
    background: var(--primary-soft);
    font-weight: 700;
}

.matrix td.new {
    color: #0b0e14;
    background: var(--cyan);
}

.matrix td.hl {
    outline: 1px solid rgba(245, 158, 11, 0.5);
}

/* Caption & player */
.viz-caption {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    min-height: 64px;
    padding: 14px 18px;
    border-top: 1px solid var(--border-soft);
    background: var(--bg-2);
    font-size: 14.5px;
    line-height: 1.6;
}

.viz-caption .badge {
    flex: none;
    padding: 2px 9px;
    margin-top: 1px;
    border-radius: 6px;
    background: var(--panel-3);
    color: var(--muted);
    font: 700 11.5px var(--mono);
}

.viz-caption .text {
    color: var(--text-soft);
}

.viz-caption .text b {
    color: var(--text-strong);
}

.viz-caption .text code {
    padding: 1px 6px;
    border-radius: 5px;
    background: var(--panel-3);
    color: var(--hl-text);
    font-size: 0.9em;
}

.viz-player {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-top: 1px solid var(--border-soft);
    background: var(--panel);
    flex-wrap: wrap;
}

.player-btns {
    display: flex;
    gap: 4px;
}

.player-btn {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border: 0;
    border-radius: 8px;
    background: var(--panel-2);
    color: var(--text);
    transition: background 0.15s;
}

.player-btn:hover {
    background: var(--panel-3);
}

.player-btn.play {
    width: 42px;
    background: var(--grad-primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(139, 92, 246, 0.35);
}

.timeline {
    flex: 1;
    min-width: 160px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.timeline input[type="range"] {
    flex: 1;
    accent-color: var(--primary);
}

.step-count {
    font: 600 12px var(--mono);
    color: var(--muted);
    min-width: 70px;
    text-align: right;
}

.speed {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--muted);
    font-size: 12px;
}

.speed select {
    height: 30px;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: var(--panel-2);
    color: var(--text);
    font: 600 12px var(--mono);
    padding: 0 6px;
}

.viz-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    padding: 10px 16px 14px;
    background: var(--panel);
    color: var(--muted);
    font-size: 12px;
}

.viz-legend span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.viz-legend i {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid;
}

.viz-hint {
    position: absolute;
    left: 14px;
    top: 12px;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(var(--glass-rgb), 0.85);
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 12px;
    pointer-events: none;
}

/* Graph yang bisa diedit: toolbar di atas, petunjuk pindah ke bawah agar tidak tertutup */
.graph-stage:has(.graph-tools) > .viz-hint {
    top: auto;
    bottom: 10px;
}

/* Graph SVG (v2) */
.graph-stage {
    position: relative;
}

.graph-stage[data-gmode="node"] svg.graph {
    cursor: crosshair;
}

.graph-stage[data-gmode="edge"] .g-node,
.graph-stage[data-gmode="erase"] .g-node,
.graph-stage[data-gmode="erase"] .g-edge {
    cursor: pointer;
}

.graph-stage.dragging-node,
.graph-stage.dragging-node .g-node {
    cursor: grabbing;
}

.g-edge .g-line {
    stroke: var(--line-strong);
    stroke-width: 2.5;
    fill: none;
    stroke-linecap: round;
    transition:
        stroke 0.35s,
        stroke-width 0.35s,
        opacity 0.35s;
}

.g-edge .g-hit {
    stroke: transparent;
    stroke-width: 16;
    fill: none;
}

.graph-stage[data-gmode="erase"] .g-edge:hover .g-line {
    stroke: var(--red);
    opacity: 0.85;
}

.g-edge.active .g-line {
    stroke: var(--amber);
    stroke-width: 4;
    stroke-dasharray: 8 6;
    animation: dash 0.6s linear infinite;
    filter: drop-shadow(0 0 4px rgba(245, 158, 11, 0.55));
}

.g-edge.tree .g-line {
    stroke: var(--primary);
    stroke-width: 4;
}

.g-edge.path .g-line {
    stroke: var(--green);
    stroke-width: 5;
    filter: drop-shadow(0 0 6px rgba(34, 197, 94, 0.6));
}

.g-edge.skip .g-line {
    stroke: var(--red);
    opacity: 0.6;
}

.g-edge.new .g-line {
    stroke: var(--cyan);
    stroke-width: 4;
}

.g-edge.dim .g-line {
    opacity: 0.2;
}

@keyframes dash {
    to {
        stroke-dashoffset: -14;
    }
}

.g-weights,
.g-fx {
    pointer-events: none;
}

.g-weight rect {
    fill: var(--panel-deep);
    stroke: var(--line-strong);
    transition:
        stroke 0.3s,
        fill 0.3s;
}

.g-weight text {
    fill: var(--svg-text);
    font: 700 11.5px var(--mono);
    text-anchor: middle;
    dominant-baseline: central;
}

.g-weight.active rect {
    stroke: var(--amber);
    fill: rgba(245, 158, 11, 0.16);
}

.g-weight.active text {
    fill: var(--hl-text);
}

.g-weight.path rect {
    stroke: var(--green);
    fill: rgba(34, 197, 94, 0.16);
}

.g-weight.path text {
    fill: var(--green-text);
}

.g-weight.skip rect {
    stroke: var(--red);
}

.g-weight.dim {
    opacity: 0.35;
}

.g-node {
    cursor: grab;
}

.g-node circle.body {
    fill: url(#aa-ng-base);
    stroke: var(--line-strong);
    stroke-width: 2.5;
    transition:
        stroke 0.35s,
        stroke-width 0.35s;
}

.g-node circle.shine {
    fill: rgba(var(--tint-rgb), 0.045);
    pointer-events: none;
}

.g-node circle.halo {
    fill: transparent;
    transition: fill 0.35s;
}

.g-node text.label {
    fill: var(--svg-text);
    font: 700 14px var(--mono);
    text-anchor: middle;
    dominant-baseline: central;
    pointer-events: none;
}

.g-node circle.ring {
    fill: none;
    stroke: transparent;
    stroke-width: 2;
    transition: stroke 0.3s;
}

.g-node:hover circle.body {
    stroke: var(--line-strong);
}

.g-node.queued circle.body {
    fill: url(#aa-ng-queued);
    stroke: var(--cyan);
}

.g-node.queued circle.halo {
    fill: rgba(34, 211, 238, 0.1);
}

.g-node.current circle.body {
    fill: url(#aa-ng-current);
    stroke: var(--hl-text);
    filter: url(#aa-glow);
}

.g-node.current text.label {
    fill: var(--on-amber);
}

.g-node.current circle.halo {
    fill: rgba(245, 158, 11, 0.14);
}

.g-node.current circle.ring {
    stroke: rgba(245, 158, 11, 0.55);
    animation: ring 1.2s ease-out infinite;
    transform-box: fill-box;
    transform-origin: center;
}

@keyframes ring {
    from {
        transform: scale(1);
        opacity: 1;
    }

    to {
        transform: scale(1.7);
        opacity: 0;
    }
}

.g-node.visited circle.body {
    fill: url(#aa-ng-visited);
    stroke: var(--primary-2);
}

.g-node.done circle.body {
    fill: url(#aa-ng-done);
    stroke: var(--violet-text);
}

.g-node.target circle.body {
    stroke: var(--green);
    stroke-width: 3.5;
}

.g-node.start circle.ring {
    stroke: rgba(34, 197, 94, 0.8);
    stroke-dasharray: 4 3;
}

.g-node.hl circle.body {
    stroke: var(--amber);
    stroke-width: 3.5;
}

.g-node.hl circle.halo {
    fill: rgba(245, 158, 11, 0.12);
}

.g-node.colored circle.body {
    fill: var(--node-color);
    stroke: var(--node-stroke);
}

.g-node.pick circle.ring {
    stroke: var(--cyan);
    stroke-width: 3;
    stroke-dasharray: none;
}

.g-node.pick circle.halo {
    fill: rgba(34, 211, 238, 0.18);
}

.g-badge rect {
    fill: var(--canvas);
    stroke: var(--line-strong);
    transition:
        stroke 0.3s,
        fill 0.3s;
}

.g-badge text {
    fill: var(--svg-text);
    font: 700 11px var(--mono);
    text-anchor: middle;
    dominant-baseline: central;
}

.g-badge.changed rect {
    fill: rgba(34, 211, 238, 0.2);
    stroke: var(--cyan);
}

.g-badge.changed text {
    fill: var(--cyan);
}

.g-badge.final rect {
    stroke: var(--primary-2);
}

.g-badge.ask rect {
    fill: rgba(245, 158, 11, 0.22);
    stroke: var(--amber);
    animation: pulse 1s infinite;
}

.g-badge.ask text {
    fill: var(--hl-text);
}

.g-flow {
    fill: var(--hl-fill);
    filter: url(#aa-glow);
}

.g-flow.back {
    fill: var(--violet-fill);
}

.g-flow-trail {
    fill: none;
    stroke: rgba(253, 230, 138, 0.9);
    stroke-width: 3;
    stroke-linecap: round;
}

.g-flow-trail.back {
    stroke: rgba(196, 181, 253, 0.9);
}

.g-ripple {
    fill: none;
    stroke: var(--cyan);
    stroke-width: 3;
}

/* Toolbar edit graph */
.graph-tools {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 3;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 4px;
    border-radius: 10px;
    background: rgba(var(--glass-rgb), 0.92);
    border: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(6px);
}

.graph-tools button {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    height: 28px;
    padding: 0 9px;
    border: 0;
    border-radius: 7px;
    background: transparent;
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
}

.graph-tools button:hover {
    color: var(--text);
    background: var(--panel-2);
}

.graph-tools button.active {
    color: #fff;
    background: var(--primary);
}

.graph-tools button span {
    font-size: 12px;
}

.gt-weight {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 0 6px;
    color: var(--muted);
    font-size: 12px;
}

.gt-weight input {
    width: 46px;
    height: 24px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text-strong);
    font: 600 12px var(--mono);
    text-align: center;
}

/* DP table */
.dp-wrap {
    position: relative;
    display: inline-block;
    min-width: 100%;
    padding: 14px;
}

.dp-grid {
    display: grid;
    gap: 4px;
    width: max-content;
    margin: 0 auto;
}

.dp-cell {
    position: relative;
    display: grid;
    place-items: center;
    width: var(--cell, 46px);
    height: var(--cell, 46px);
    border-radius: 9px;
    background: var(--panel-deep);
    border: 1px solid var(--line-strong);
    color: var(--text-strong);
    font: 700 14px var(--mono);
    transition:
        background 0.3s,
        border-color 0.3s,
        transform 0.3s,
        box-shadow 0.3s;
}

.dp-cell.head {
    background: transparent;
    border-color: transparent;
    color: var(--muted);
    font-size: 12.5px;
}

.dp-cell.head.big {
    color: var(--text-strong);
    font-size: 15px;
}

.dp-cell.head.hl {
    color: var(--amber);
}

.dp-cell.is-empty {
    color: transparent;
}

.dp-cell.base {
    background: rgba(139, 92, 246, 0.14);
    border-color: rgba(167, 139, 250, 0.4);
}

.dp-cell.filled {
    background: var(--panel-2);
    border-color: var(--line-strong);
}

.dp-cell.current {
    background: var(--amber);
    border-color: var(--hl-text);
    color: var(--on-amber);
    transform: scale(1.08);
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.25);
    z-index: 2;
}

.dp-cell.dep {
    border-color: var(--cyan);
    background: var(--cyan-soft);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}

.dp-cell.dep.alt {
    border-color: var(--pink);
    background: rgba(236, 72, 153, 0.14);
    box-shadow: 0 0 0 3px rgba(236, 72, 153, 0.15);
}

.dp-cell.path {
    background: var(--green-soft);
    border-color: var(--green);
    color: var(--green-text);
}

.dp-cell.block {
    background: repeating-linear-gradient(45deg, var(--blocked-a), var(--blocked-a) 6px, var(--blocked-b) 6px, var(--blocked-b) 12px);
    border-color: var(--line-strong);
    color: var(--red-text);
}

.dp-cell.pop {
    animation: pop 0.35s ease;
}

.dp-cell.clickable {
    cursor: pointer;
}

.dp-cell.clickable:hover {
    border-color: var(--red);
}

@keyframes pop {
    40% {
        transform: scale(1.18);
    }
}

.dp-cell .tiny {
    position: absolute;
    left: 4px;
    top: 2px;
    color: var(--faint);
    font-size: 9px;
    font-weight: 600;
}

.dp-arrows {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: visible;
}

.dp-arrows path {
    fill: none;
    stroke: var(--cyan);
    stroke-width: 2.5;
    stroke-linecap: round;
    animation: draw 0.4s ease;
}

.dp-arrows path.alt {
    stroke: var(--pink);
}

@keyframes draw {
    from {
        stroke-dasharray: 200;
        stroke-dashoffset: 200;
    }

    to {
        stroke-dasharray: 200;
        stroke-dashoffset: 0;
    }
}

.formula {
    padding: 10px 12px;
    border-radius: 10px;
    background: var(--canvas);
    border: 1px solid var(--border-soft);
    font: 600 13px/1.7 var(--mono);
    color: var(--text-soft);
    word-break: break-word;
}

.formula .a {
    color: var(--cyan);
}

.formula .b {
    color: var(--pink);
}

.formula .r {
    color: var(--amber);
}

.items-list {
    display: grid;
    gap: 4px;
}

.item-row {
    display: grid;
    grid-template-columns: 28px 1fr 1fr;
    align-items: center;
    gap: 6px;
    padding: 5px 8px;
    border-radius: 8px;
    background: var(--canvas);
    border: 1px solid var(--border-soft);
    font: 600 12.5px var(--mono);
    transition:
        background 0.3s,
        border-color 0.3s;
}

.item-row.hot {
    border-color: var(--amber);
    background: var(--amber-soft);
}

.item-row.pick {
    border-color: var(--green);
    background: var(--green-soft);
}

.item-row .ic {
    min-width: 22px;
    height: 22px;
    display: inline-grid;
    place-items: center;
    border-radius: 6px;
    font: 700 12px var(--mono);
    color: var(--text-strong);
    background: var(--panel-3);
}

/* Pohon rekursi */
.tree-edge {
    stroke: var(--line-strong);
    stroke-width: 2;
    transition:
        stroke 0.3s,
        opacity 0.3s;
}

.tree-edge.hidden,
.tree-node.hidden {
    opacity: 0;
}

.tree-node {
    transition: opacity 0.3s;
}

.tree-node rect {
    fill: var(--panel-2);
    stroke: var(--line-strong);
    stroke-width: 2;
    transition:
        fill 0.3s,
        stroke 0.3s;
}

.tree-node text {
    fill: var(--svg-text);
    font: 700 12px var(--mono);
    text-anchor: middle;
    dominant-baseline: central;
}

.tree-node text.val {
    fill: var(--hl-text);
    font-size: 11px;
}

.tree-node.active rect {
    fill: var(--amber);
    stroke: var(--hl-text);
}

.tree-node.active text {
    fill: var(--on-amber);
}

.tree-node.done rect {
    fill: rgba(139, 92, 246, 0.3);
    stroke: var(--primary-2);
}

.tree-node.memo rect {
    fill: var(--cyan-soft);
    stroke: var(--cyan);
    stroke-dasharray: 4 3;
}

.tree-node.repeat rect {
    stroke: var(--red);
}

.tree-node.repeat.done rect {
    fill: rgba(239, 68, 68, 0.18);
}

.counter-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.counter-box div {
    padding: 8px 10px;
    border-radius: 10px;
    background: var(--canvas);
    border: 1px solid var(--border-soft);
}

.counter-box b {
    display: block;
    font: 700 20px var(--mono);
    color: var(--text-strong);
}

.counter-box small {
    color: var(--muted);
    font-size: 11px;
}

.counter-box .bad b {
    color: var(--red-text);
}

.result-chip {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 8px;
    background: var(--green-soft);
    border: 1px solid rgba(34, 197, 94, 0.4);
    color: var(--green-text);
    font: 700 14px var(--mono);
    letter-spacing: 0.04em;
}

/* ═══════════════════════════════ Daftar soal ═══════════════════════════════ */
.list-card {
    overflow: hidden;
}

.list-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    padding: 14px 16px;
}

.chips {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 32px;
    padding: 0 14px;
    border: 0;
    border-radius: 999px;
    background: var(--panel-2);
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
    transition:
        background 0.15s,
        color 0.15s;
}

.chip:hover {
    color: var(--text);
}

.chip.active {
    background: var(--text);
    color: var(--bg);
}

.search {
    height: 34px;
    width: 260px;
    max-width: 100%;
    padding: 0 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--panel-2);
    color: var(--text);
    font: inherit;
}

.search:focus {
    outline: none;
    border-color: var(--primary);
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-soft);
    color: var(--muted);
    font-size: 12px;
    font-weight: 600;
    text-align: left;
}

.table td {
    padding: 13px 16px;
    border-bottom: 1px solid var(--border-soft);
}

.table tbody tr:last-child td {
    border-bottom: 0;
}

.table tbody tr.clickable {
    cursor: pointer;
}

.table tbody tr.clickable:hover {
    background: rgba(var(--tint-rgb), 0.03);
}

.table tbody tr.clickable:hover .row-title {
    color: var(--primary-2);
}

.row-title {
    color: var(--text-strong);
    font-weight: 600;
    transition: color 0.15s;
}

.row-sub {
    display: block;
    color: var(--muted);
    font-size: 12px;
}

.col-status {
    width: 56px;
}

.col-num {
    width: 110px;
    white-space: nowrap;
}

.pager {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
    padding: 14px;
    border-top: 1px solid var(--border-soft);
}

/* Peringkat */
.rank {
    display: inline-grid;
    place-items: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--panel-2);
    color: var(--muted);
    font: 700 12px var(--mono);
}

.rank-1 {
    background: linear-gradient(135deg, var(--hl-text), #f59e0b);
    color: var(--on-amber);
}

.rank-2 {
    background: linear-gradient(135deg, #e5e7eb, #9ca3af);
    color: #111;
}

.rank-3 {
    background: linear-gradient(135deg, #fdba74, #c2410c);
    color: #1a0a00;
}

.table tr.me {
    background: var(--primary-soft) !important;
}

.lb-user {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text-strong);
    font-weight: 600;
}

.points {
    font: 800 15px var(--mono);
    background: var(--grad-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ═══════════════════════════════ Workspace soal ═══════════════════════════════ */
.page-workspace {
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.page-workspace .topbar {
    position: relative;
    height: 52px;
    padding: 0 12px;
}

.workspace {
    flex: 1;
    min-height: 0;
    display: flex;
    padding: 8px;
}

.pane {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    overflow: hidden;
    border-radius: 12px;
    background: var(--panel);
    border: 1px solid var(--border-soft);
}

.pane-left {
    flex: 0 0 42%;
}

.pane-right {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.editor-pane {
    flex: 1;
}

.console-pane {
    flex: 0 0 36%;
}

.gutter {
    flex: none;
    display: grid;
    place-items: center;
    touch-action: none;
}

.gutter span {
    border-radius: 4px;
    background: var(--border);
    transition: background 0.15s;
}

.gutter:hover span,
.dragging .gutter span {
    background: var(--primary);
}

.gutter-x {
    width: 8px;
    cursor: col-resize;
}

.gutter-x span {
    width: 2px;
    height: 36px;
}

.gutter-y {
    height: 8px;
    cursor: row-resize;
}

.gutter-y span {
    height: 2px;
    width: 36px;
}

.dragging {
    user-select: none;
}

.pane-tabs {
    flex: none;
    display: flex;
    align-items: center;
    gap: 2px;
    height: 40px;
    padding: 0 6px;
    background: var(--bg-2);
    border-bottom: 1px solid var(--border-soft);
}

.tab {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    height: 30px;
    padding: 0 11px;
    border: 0;
    border-radius: 7px;
    background: transparent;
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
}

.tab:hover:not(.static) {
    color: var(--text);
    background: var(--panel-2);
}

.tab.active {
    color: var(--text-strong);
    background: var(--panel-2);
}

.tab.static {
    cursor: default;
}

.tab .count {
    padding: 0 6px;
    border-radius: 999px;
    background: var(--panel-3);
    font-size: 11px;
}

.pane-body {
    flex: 1;
    overflow: auto;
}

.tab-panel {
    display: none;
    padding: 20px 22px 40px;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.2s ease;
}

.problem-title {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin: 0 0 12px;
    font-size: 23px;
    letter-spacing: -0.02em;
    color: var(--text-strong);
}

.problem-meta {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.statement {
    color: var(--text-soft);
    font-size: 14.5px;
    line-height: 1.75;
}

.statement h3 {
    margin: 22px 0 8px;
    color: var(--text-strong);
    font-size: 15px;
}

.statement p {
    margin: 0 0 10px;
}

.statement ul {
    margin: 0 0 10px;
    padding-left: 20px;
}

.sample {
    margin: 14px 0;
    border-radius: 12px;
    border: 1px solid var(--border-soft);
    overflow: hidden;
}

.sample-head {
    padding: 8px 12px;
    background: var(--panel-2);
    color: var(--text-strong);
    font-weight: 700;
    font-size: 13px;
}

.sample-io {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.sample-io > div {
    min-width: 0;
}

.sample-io > div + div {
    border-left: 1px solid var(--border-soft);
}

.sample-io small {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 12px 0;
    color: var(--faint);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.sample-io pre {
    margin: 0;
    padding: 6px 12px 12px;
    overflow: auto;
    max-height: 220px;
    color: var(--text-strong);
    font-size: 13px;
}

.sample-note {
    padding: 10px 12px;
    border-top: 1px solid var(--border-soft);
    background: var(--panel-2);
    color: var(--muted);
    font-size: 13.5px;
}

.copy-btn {
    border: 0;
    background: none;
    color: var(--faint);
    font-size: 11px;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
}

.copy-btn:hover {
    color: var(--primary-2);
}

.lesson-link {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 22px;
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid rgba(139, 92, 246, 0.35);
    background: linear-gradient(0deg, var(--primary-soft), var(--primary-soft)), var(--panel);
    transition: border-color 0.15s;
}

.lesson-link:hover {
    border-color: var(--primary);
}

.lesson-link b {
    display: block;
    color: var(--text-strong);
}

.lesson-link small {
    color: var(--muted);
}

.locked {
    display: grid;
    justify-items: center;
    gap: 6px;
    padding: 56px 20px;
    text-align: center;
    color: var(--muted);
}

.locked h3 {
    margin: 0;
    color: var(--text-strong);
}

.locked p {
    margin: 0;
    max-width: 40ch;
}

/* Editor */
.editor-head {
    justify-content: space-between;
}

.editor-tools {
    display: flex;
    align-items: center;
    gap: 6px;
}

.lang-select {
    height: 30px;
    padding: 0 8px;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: var(--panel-2);
    color: var(--text-strong);
    font: 600 12.5px var(--sans);
}

.editor-host {
    position: relative;
    flex: 1;
    min-height: 0;
}

.editor-host .monaco {
    position: absolute;
    inset: 0;
}

.editor-loading {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: var(--muted);
}

.editor-status {
    flex: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    height: 28px;
    padding: 0 12px;
    border-top: 1px solid var(--border-soft);
    color: var(--muted);
    font-size: 12px;
}

.runtime-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.runtime-status i {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--faint);
}

.runtime-status.ready i {
    background: var(--green);
}

.runtime-status.loading i {
    background: var(--amber);
    animation: pulse 1s infinite;
}

/* Console */
.console-body {
    position: relative;
    flex: 1;
    min-height: 0;
}

.ctab-panel {
    position: absolute;
    inset: 0;
    display: none;
    overflow: auto;
    padding: 14px 16px;
}

.ctab-panel.active {
    display: block;
}

.case-tabs {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.case-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 30px;
    padding: 0 12px;
    border: 1px solid transparent;
    border-radius: 8px;
    background: var(--panel-2);
    color: var(--muted);
    font-size: 12.5px;
    font-weight: 600;
}

.case-tab.active {
    color: var(--text-strong);
    border-color: var(--border);
    background: var(--panel-3);
}

.case-tab i {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--faint);
}

.case-tab.AC i {
    background: var(--green);
}

.case-tab.WA i,
.case-tab.RE i {
    background: var(--red);
}

.case-tab.TLE i {
    background: var(--amber);
}

.io-block {
    margin-bottom: 10px;
}

.io-block small {
    display: block;
    margin-bottom: 4px;
    color: var(--faint);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.io-block pre,
.io-block textarea {
    width: 100%;
    margin: 0;
    padding: 9px 12px;
    border-radius: 9px;
    background: var(--canvas);
    border: 1px solid var(--border-soft);
    color: var(--text-strong);
    font: 13px/1.55 var(--mono);
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 200px;
    overflow: auto;
}

.io-block textarea {
    resize: vertical;
    min-height: 100px;
    outline: none;
}

.io-block textarea:focus {
    border-color: var(--primary);
}

.io-block pre.bad {
    border-color: rgba(239, 68, 68, 0.45);
}

.io-block pre.good {
    border-color: rgba(34, 197, 94, 0.45);
}

.io-block pre.err {
    color: var(--red-text);
}

.run-summary {
    display: flex;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.run-summary h3 {
    margin: 0;
    font-size: 20px;
}

.run-summary .muted {
    font-size: 13px;
}

.test-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(74px, 1fr));
    gap: 6px;
    margin: 12px 0;
}

.test-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 7px 4px;
    border-radius: 9px;
    background: var(--panel-2);
    border: 1px solid var(--border-soft);
    font: 600 11px var(--mono);
    color: var(--muted);
    animation: dsIn 0.3s ease backwards;
}

.test-box b {
    font-size: 13px;
}

.test-box.AC {
    border-color: rgba(34, 197, 94, 0.45);
    background: var(--green-soft);
}

.test-box.AC b {
    color: var(--green);
}

.test-box.WA,
.test-box.RE {
    border-color: rgba(239, 68, 68, 0.45);
    background: var(--red-soft);
}

.test-box.WA b,
.test-box.RE b {
    color: var(--red-text);
}

.test-box.TLE {
    border-color: rgba(245, 158, 11, 0.45);
    background: var(--amber-soft);
}

.test-box.TLE b {
    color: var(--amber);
}

.test-box.pending b {
    color: var(--faint);
}

.test-box.running {
    border-color: var(--primary);
}

.test-box.running b {
    animation: pulse 0.8s infinite;
}

.score-big {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 16px;
    margin-bottom: 12px;
    border-radius: 14px;
    background: var(--panel-2);
    border: 1px solid var(--border-soft);
}

.score-big .num {
    font: 800 34px var(--mono);
    color: var(--text-strong);
    line-height: 1;
}

.score-big .num small {
    color: var(--muted);
    font-size: 14px;
}

.score-big.ac {
    border-color: rgba(34, 197, 94, 0.45);
    background: linear-gradient(0deg, var(--green-soft), var(--green-soft)), var(--panel-2);
}

/* Riwayat submisi di workspace */
.sub-list {
    display: grid;
    gap: 6px;
}

.sub-item {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 10px;
    background: var(--panel-2);
    border: 1px solid var(--border-soft);
}

.sub-item small {
    display: block;
    color: var(--muted);
    font-size: 12px;
}

/* Editorial */
.editorial-code {
    margin-top: 16px;
}

/* Toast & confetti */
.toast {
    position: fixed;
    left: 50%;
    bottom: 26px;
    z-index: 90;
    transform: translate(-50%, 20px);
    opacity: 0;
    padding: 11px 18px;
    border-radius: 10px;
    background: var(--panel-3);
    color: var(--text-strong);
    font-weight: 600;
    box-shadow: var(--shadow);
    pointer-events: none;
    transition: all 0.25s ease;
}

.toast.show {
    transform: translate(-50%, 0);
    opacity: 1;
}

.toast.bad {
    background: #7f1d1d;
}

.confetti {
    position: fixed;
    z-index: 95;
    width: 8px;
    height: 12px;
    border-radius: 2px;
    pointer-events: none;
    animation: confetti 1.5s cubic-bezier(0.2, 0.7, 0.4, 1) forwards;
}

@keyframes confetti {
    to {
        transform: translate(var(--dx), var(--dy)) rotate(var(--r));
        opacity: 0;
    }
}

/* Modal AC */
.modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 80;
    display: grid;
    place-items: center;
    padding: 16px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s;
}

.modal {
    position: relative;
    width: min(420px, 100%);
    padding: 30px 26px 24px;
    border-radius: 18px;
    background: var(--panel);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    text-align: center;
    animation: modalIn 0.3s cubic-bezier(0.2, 0.8, 0.3, 1.2);
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.92) translateY(10px);
    }
}

.modal-icon {
    display: grid;
    place-items: center;
    width: 72px;
    height: 72px;
    margin: 0 auto 14px;
    border-radius: 50%;
    background: var(--green-soft);
    border: 2px solid var(--green);
    color: var(--green);
}

.modal h2 {
    margin: 0 0 6px;
    color: var(--text-strong);
}

.modal p {
    margin: 0 0 18px;
    color: var(--muted);
}

.modal-actions {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

/* ═══════════════════════════════ Auth ═══════════════════════════════ */
.page-auth {
    min-height: 100vh;
    background: #eef2ff;
}

.auth-wrap {
    min-height: 100vh;
    max-width: 1080px;
    margin: 0 auto;
    padding: 40px 20px;
    display: grid;
    grid-template-columns: 1.15fr 1fr;
    align-items: center;
    gap: 56px;
}

.auth-side .logo {
    margin-bottom: 36px;
    font-size: 19px;
}

.auth-side h1 {
    margin: 0 0 14px;
    font-size: clamp(32px, 4vw, 46px);
    line-height: 1.08;
    letter-spacing: -0.03em;
    color: var(--text-strong);
}

.auth-side > p {
    margin: 0 0 26px;
    max-width: 46ch;
    color: var(--muted);
    font-size: 15px;
}

.auth-visual {
    max-width: 440px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: rgba(var(--glass-rgb), 0.75);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.auth-visual svg {
    display: block;
    width: 100%;
    height: auto;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    justify-self: end;
    padding: 36px 32px 30px;
    border-radius: 18px;
    background: rgba(var(--glass-rgb), 0.88);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
}

.auth-card h2 {
    margin: 0 0 4px;
    font-size: 24px;
    color: var(--text-strong);
}

.auth-card > p {
    margin: 0 0 24px;
    color: var(--muted);
}

.auth-form {
    display: grid;
    gap: 18px;
}

.field {
    display: grid;
    gap: 6px;
}

.field > span:first-child {
    font-size: 13px;
    font-weight: 600;
}

.field small {
    font-size: 12px;
}

.field small.error {
    color: var(--red-text);
}

.field input {
    width: 100%;
    height: 46px;
    padding: 0 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text-strong);
    font: inherit;
    font-size: 15px;
    transition:
        border-color 0.15s,
        box-shadow 0.15s;
}

.field input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-soft);
}

.field input.invalid {
    border-color: var(--red);
}

.password-wrap {
    position: relative;
    display: block;
}

.password-wrap input {
    padding-right: 96px;
}

.toggle-pw {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    height: 34px;
    padding: 0 10px;
    border: 0;
    border-radius: 7px;
    background: transparent;
    color: var(--muted);
    font-size: 12px;
    font-weight: 600;
}

.toggle-pw:hover {
    background: var(--panel-2);
    color: var(--text);
}

.check {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    cursor: pointer;
    user-select: none;
}

.check input {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}

.auth-switch {
    margin: 20px 0 0;
    padding-top: 18px;
    border-top: 1px solid var(--border-soft);
    text-align: center;
    color: var(--muted);
}

/* ═══════════════════════════════ Visualizer v2: kontrol & Mode Tebak ═══════════════════════════════ */
.viz-head {
    position: relative;
}

.viz-icon-btn {
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel-2);
    color: var(--muted);
    transition:
        color 0.15s,
        border-color 0.15s;
}

.viz-icon-btn:hover {
    color: var(--text);
    border-color: var(--primary);
}

.viz:fullscreen {
    overflow: auto;
    border-radius: 0;
    background: var(--bg);
}

.viz:fullscreen .viz-body {
    min-height: 60vh;
}

.viz:fullscreen .viz-stage svg.graph {
    max-height: 68vh;
}

.viz:fullscreen .viz-side {
    max-height: none;
}

.viz-caption {
    position: relative;
    border-left: 3px solid transparent;
    transition: border-color 0.3s;
}

.viz-caption[data-mark="discover"],
.viz-caption[data-mark="relax"] {
    border-left-color: var(--cyan);
}

.viz-caption[data-mark="take"],
.viz-caption[data-mark="done"] {
    border-left-color: var(--green);
}

.viz-caption[data-mark="skip"] {
    border-left-color: var(--red);
}

.viz-caption[data-mark="key"] {
    border-left-color: var(--amber);
}

.viz-caption.flash-ok {
    animation: flashOk 0.9s ease;
}

.viz-caption.flash-reveal {
    animation: flashReveal 0.9s ease;
}

@keyframes flashOk {
    0% {
        background: rgba(34, 197, 94, 0.28);
    }
}

@keyframes flashReveal {
    0% {
        background: rgba(245, 158, 11, 0.2);
    }
}

.practice-toggle {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    height: 34px;
    padding: 0 12px;
    border: 1px solid var(--border);
    border-radius: 9px;
    background: var(--panel-2);
    color: var(--muted);
    font-size: 12.5px;
    font-weight: 700;
    transition:
        color 0.15s,
        border-color 0.15s,
        background 0.15s;
}

.practice-toggle:hover {
    color: var(--text);
    border-color: var(--amber);
}

.practice-toggle.active {
    color: var(--on-amber);
    border-color: var(--amber);
    background: linear-gradient(135deg, var(--hl-text), #f59e0b);
    box-shadow: 0 4px 16px rgba(245, 158, 11, 0.35);
}

.practice-toggle b {
    padding: 1px 7px;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.18);
    font: 800 11px var(--mono);
}

.viz-prompt {
    padding: 14px 18px;
    border-top: 1px solid rgba(245, 158, 11, 0.4);
    background:
        linear-gradient(90deg, rgba(245, 158, 11, 0.12), rgba(245, 158, 11, 0.03)),
        var(--bg-2);
    animation: fadeIn 0.25s ease;
}

.viz-prompt.shake {
    animation: promptShake 0.4s ease;
}

@keyframes promptShake {
    20%,
    60% {
        transform: translateX(-5px);
    }

    40%,
    80% {
        transform: translateX(5px);
    }
}

.prompt-q {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 15px;
    color: var(--amber-text);
}

.prompt-q b {
    color: var(--hl-text);
}

.prompt-q code {
    padding: 1px 6px;
    border-radius: 5px;
    background: rgba(245, 158, 11, 0.16);
    color: var(--hl-text);
}

.prompt-icon {
    font-size: 20px;
    line-height: 1.2;
}

.prompt-a {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin: 10px 0 0 30px;
}

.prompt-input {
    width: 140px;
    height: 34px;
    padding: 0 12px;
    border: 1px solid rgba(245, 158, 11, 0.6);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text-strong);
    font: 700 15px var(--mono);
    outline: none;
}

.prompt-input:focus {
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.25);
}

.prompt-opt {
    border: 1px solid var(--border);
}

.prompt-opt:hover {
    border-color: var(--amber);
}

.prompt-hint {
    color: var(--amber-text);
    font-weight: 600;
    font-size: 13px;
    animation: pulse 1.4s infinite;
}

.prompt-fb {
    margin: 8px 0 0 30px;
    font-size: 13.5px;
}

.prompt-fb:empty {
    display: none;
}

.prompt-fb.bad {
    color: var(--red-text);
}

.viz.asking .viz-caption .text {
    color: var(--muted);
}

/* Timeline dengan penanda peristiwa */
.timeline-track {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
}

.timeline-track input[type="range"] {
    width: 100%;
}

.timeline-marks {
    position: absolute;
    left: 8px;
    right: 8px;
    top: -6px;
    height: 6px;
    pointer-events: none;
}

.timeline-marks .mk {
    position: absolute;
    top: 0;
    width: 2px;
    height: 6px;
    margin-left: -1px;
    border-radius: 2px;
    background: var(--faint);
    opacity: 0.85;
}

.mk-key {
    background: var(--amber) !important;
}

.mk-discover,
.mk-relax {
    background: var(--cyan) !important;
}

.mk-take,
.mk-done {
    background: var(--green) !important;
}

.mk-skip {
    background: var(--red) !important;
    opacity: 0.5 !important;
}

/* Jejak langkah */
.viz-log {
    border-top: 1px solid var(--border-soft);
    background: var(--panel);
}

.viz-log summary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
}

.viz-log summary::-webkit-details-marker {
    display: none;
}

.viz-log summary small {
    margin-left: auto;
    color: var(--faint);
    font-weight: 500;
}

.viz-log summary::after {
    content: "▾";
    color: var(--faint);
    transition: transform 0.2s;
}

.viz-log[open] summary::after {
    transform: rotate(180deg);
}

.viz-log-list {
    max-height: 260px;
    overflow: auto;
    margin: 0;
    padding: 0 10px 12px;
    list-style: none;
    position: relative;
}

.viz-log-list li {
    display: flex;
    gap: 10px;
    padding: 6px 8px;
    border-radius: 7px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
    cursor: pointer;
    border-left: 2px solid transparent;
}

.viz-log-list li:hover {
    background: var(--panel-2);
    color: var(--text);
}

.viz-log-list li span {
    flex: none;
    min-width: 26px;
    color: var(--faint);
    font: 600 11.5px var(--mono);
    padding-top: 1px;
}

.viz-log-list li.on {
    background: var(--primary-soft);
    color: var(--text-strong);
}

.viz-log-list li.lg-key {
    border-left-color: var(--amber);
}

.viz-log-list li.lg-discover,
.viz-log-list li.lg-relax {
    border-left-color: var(--cyan);
}

.viz-log-list li.lg-take,
.viz-log-list li.lg-done {
    border-left-color: var(--green);
}

.viz-log-list li.lg-skip {
    border-left-color: rgba(239, 68, 68, 0.6);
}

/* Panel variabel */
.watch {
    display: grid;
    gap: 3px;
}

.watch-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    padding: 5px 9px;
    border-radius: 7px;
    background: var(--canvas);
    border: 1px solid var(--border-soft);
    font: 12.5px var(--mono);
    transition:
        background 0.3s,
        border-color 0.3s;
}

.watch-row span {
    color: var(--muted);
}

.watch-row b {
    color: var(--text-strong);
    text-align: right;
    word-break: break-word;
}

.watch-row.chg {
    border-color: rgba(34, 211, 238, 0.5);
    background: rgba(34, 211, 238, 0.08);
}

.watch-row.chg b {
    color: var(--cyan);
}

.watch-row.ask {
    border-color: var(--amber);
    background: var(--amber-soft);
}

.watch-row.ask b {
    color: var(--hl-text);
}

/* Struktur data: stack vertikal & bar PQ */
.ds-items.ds-vertical {
    flex-direction: column-reverse;
    align-items: stretch;
}

.ds-items.ds-vertical .ds-item {
    flex-direction: row;
    justify-content: space-between;
    height: 30px;
}

.ds-item {
    position: relative;
    overflow: hidden;
}

.ds-item b,
.ds-item small {
    position: relative;
}

.ds-bar {
    position: absolute;
    left: 0;
    bottom: 0;
    height: 3px;
    background: var(--cyan);
    opacity: 0.8;
    border-radius: 0 2px 2px 0;
}

.ds-item.hot .ds-bar {
    background: var(--amber);
}

.ds-item.front {
    border-color: rgba(34, 211, 238, 0.6);
}

.dist-cell.ask {
    border-color: var(--amber);
    background: var(--amber-soft);
}

.dist-cell.ask b {
    color: var(--hl-text);
}

/* Pohon rekursi: sel yang ditebak */
.tree-node.ask rect {
    fill: var(--amber-soft);
    stroke: var(--amber);
    animation: pulse 1s infinite;
}

.tree-edge {
    fill: none;
}

/* Tabel DP v2 */
.dp-cell.ask {
    background: var(--amber-soft) !important;
    border-color: var(--amber) !important;
    color: var(--hl-text) !important;
    animation: pulse 1s infinite;
}

.dp-cell.gone {
    opacity: 0.22;
}

.dp-cell.range {
    border-color: rgba(34, 211, 238, 0.55);
    background: rgba(34, 211, 238, 0.08);
}

.dp-arrow-label {
    font: 800 10.5px var(--mono);
    text-anchor: middle;
    paint-order: stroke;
    stroke: var(--canvas);
    stroke-width: 4px;
}

.dp-arrow-label.a {
    fill: var(--cyan);
}

.dp-arrow-label.b {
    fill: #f9a8d4;
}

.dp-arrow-label.g {
    fill: #86efac;
}

.dp-arrows path.dp-arrow {
    fill: none;
    stroke-width: 2.5;
    stroke-linecap: round;
    animation: draw 0.4s ease;
}

.dp-arrows path.dp-arrow.a {
    stroke: var(--cyan);
}

.dp-arrows path.dp-arrow.b {
    stroke: var(--pink);
}

.dp-arrows path.dp-arrow.g {
    stroke: var(--green);
}

.dp-path-line {
    fill: none;
    stroke: var(--green);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-linejoin: round;
    opacity: 0.7;
    stroke-dasharray: 10 7;
    animation: dash 0.8s linear infinite;
    filter: drop-shadow(0 0 5px rgba(34, 197, 94, 0.6));
}

.cap-meter {
    margin-top: 10px;
}

.cap-bar {
    height: 8px;
    border-radius: 6px;
    background: var(--panel-3);
    overflow: hidden;
}

.cap-bar i {
    display: block;
    height: 100%;
    border-radius: 6px;
    background: linear-gradient(90deg, var(--green), #86efac);
    transition: width 0.5s ease;
}

.cap-meter small {
    display: block;
    margin-top: 4px;
    color: var(--muted);
    font-size: 12px;
}

/* Grafik pertumbuhan pemanggilan Fibonacci */
.growth-chart {
    width: 100%;
    height: auto;
    display: block;
}

.growth-chart .gc-naive {
    fill: rgba(239, 68, 68, 0.55);
}

.growth-chart .gc-memo {
    fill: rgba(34, 211, 238, 0.75);
}

.growth-chart .gc-naive.on {
    fill: #ef4444;
}

.growth-chart .gc-memo.on {
    fill: #22d3ee;
}

.growth-chart .gc-k {
    fill: var(--faint);
    font: 600 9px var(--mono);
    text-anchor: middle;
}

.growth-chart .gc-k.on {
    fill: var(--amber);
}

.gc-legend {
    display: grid;
    gap: 3px;
    margin-top: 6px;
    color: var(--muted);
    font-size: 12px;
}

.gc-legend i {
    display: inline-block;
    width: 10px;
    height: 10px;
    margin-right: 6px;
    border-radius: 3px;
    vertical-align: -1px;
}

.gc-legend i.gc-naive {
    background: #ef4444;
}

.gc-legend i.gc-memo {
    background: #22d3ee;
}

.gc-legend b {
    color: var(--text-strong);
}

/* MST: daftar sisi & komponen */
.edge-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(78px, 1fr));
    gap: 4px;
}

.edge-row {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 4px;
    padding: 4px 7px;
    border-radius: 7px;
    background: var(--canvas);
    border: 1px solid var(--border-soft);
    font: 12px var(--mono);
    color: var(--muted);
    transition:
        background 0.25s,
        border-color 0.25s;
}

.edge-row b {
    color: var(--text-strong);
}

.edge-row i {
    font-style: normal;
    font-weight: 800;
    width: 10px;
    text-align: center;
}

.edge-row.current {
    border-color: var(--amber);
    background: var(--amber-soft);
    color: var(--hl-text);
}

.edge-row.take {
    border-color: rgba(34, 197, 94, 0.55);
    background: var(--green-soft);
    color: var(--green-text);
}

.edge-row.take i {
    color: var(--green);
}

.edge-row.reject {
    opacity: 0.55;
    text-decoration: line-through;
}

.edge-row.reject i {
    color: var(--red);
}

.comp-groups {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.comp-chip {
    padding: 3px 9px;
    border-radius: 999px;
    border: 1px solid;
    color: var(--text-strong);
    font: 700 12px var(--mono);
    animation: dsIn 0.3s ease;
}

.comp-count {
    margin-top: 6px;
    color: var(--muted);
    font-size: 12px;
}

/* LIS: batang & busur */
svg.bars .lis-bar .bar {
    fill: var(--panel-2);
    stroke: var(--edge);
    stroke-width: 1.5;
    transition:
        fill 0.3s,
        stroke 0.3s,
        opacity 0.3s;
}

svg.bars .bar-val {
    fill: var(--text-strong);
    font: 700 13px var(--mono);
    text-anchor: middle;
}

svg.bars .bar-idx {
    fill: var(--faint);
    font: 600 10.5px var(--mono);
    text-anchor: middle;
}

svg.bars .lis-bar.cur .bar {
    fill: var(--amber);
    stroke: var(--hl-text);
    filter: drop-shadow(0 0 8px rgba(245, 158, 11, 0.6));
}

svg.bars .lis-bar.cmp-ok .bar {
    fill: rgba(34, 211, 238, 0.35);
    stroke: var(--cyan);
}

svg.bars .lis-bar.cmp-bad .bar {
    fill: rgba(239, 68, 68, 0.28);
    stroke: var(--red);
}

svg.bars .lis-bar.later {
    opacity: 0.35;
}

svg.bars .lis-bar.lis .bar {
    fill: rgba(34, 197, 94, 0.45);
    stroke: var(--green);
}

svg.bars .lis-dp rect {
    fill: var(--panel-deep);
    stroke: var(--line-strong);
}

svg.bars .lis-dp text {
    fill: var(--text-strong);
    font: 700 14px var(--mono);
    text-anchor: middle;
    dominant-baseline: central;
}

svg.bars .lis-dp.cur rect {
    stroke: var(--amber);
    fill: var(--amber-soft);
}

svg.bars .lis-dp.ask rect {
    stroke: var(--amber);
    fill: rgba(245, 158, 11, 0.25);
    animation: pulse 1s infinite;
}

svg.bars .lis-dp.lis rect {
    stroke: var(--green);
    fill: var(--green-soft);
}

svg.bars .lis-dp-label {
    fill: var(--muted);
    font: 700 12px var(--mono);
}

.lis-arc {
    fill: none;
    stroke-width: 2.5;
    stroke-linecap: round;
    animation: draw 0.5s ease;
}

.lis-arc.take {
    stroke: var(--green);
}

.lis-arc.check {
    stroke: var(--cyan);
    stroke-dasharray: 5 4;
    opacity: 0.8;
}

.lis-line {
    fill: none;
    stroke: var(--green);
    stroke-width: 3;
    stroke-dasharray: 8 6;
    animation: dash 0.8s linear infinite;
    opacity: 0.85;
}

/* ═══════════════════════════════ Widget Big-O ═══════════════════════════════ */
.bigo-body {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 16px;
    padding: 16px;
    background: var(--canvas);
}

.bigo-slider input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
}

.bigo-scale {
    display: flex;
    justify-content: space-between;
    color: var(--faint);
    font: 600 11px var(--mono);
}

.bigo-svg {
    width: 100%;
    height: auto;
    display: block;
    margin-top: 10px;
}

.bigo-grid {
    stroke: var(--line-strong);
    stroke-width: 1;
}

.bigo-ax,
.bigo-ay {
    fill: var(--faint);
    font: 600 10px var(--mono);
}

.bigo-ax {
    text-anchor: middle;
}

.bigo-ay {
    text-anchor: end;
}

.bigo-axis-title {
    display: none;
}

.bigo-tle {
    fill: rgba(239, 68, 68, 0.06);
}

.bigo-tle-label {
    fill: rgba(252, 165, 165, 0.7);
    font: 600 11px var(--sans);
    text-anchor: end;
}

.bigo-limit {
    stroke: rgba(239, 68, 68, 0.7);
    stroke-width: 1.5;
    stroke-dasharray: 6 5;
}

.bigo-limit-label {
    fill: var(--red-text);
    font: 700 11px var(--sans);
}

.bigo-curve {
    fill: none;
    stroke-width: 2.5;
    stroke-linecap: round;
    opacity: 0.9;
}

.bigo-now {
    stroke: var(--text);
    stroke-width: 1.5;
    stroke-dasharray: 3 4;
    opacity: 0.6;
}

.bigo-dot {
    stroke: var(--canvas);
    stroke-width: 2;
}

.bigo-table {
    display: grid;
    gap: 4px;
    align-content: start;
}

.bigo-row {
    display: grid;
    grid-template-columns: 1.25fr 1.15fr 1fr;
    align-items: center;
    gap: 10px;
    padding: 7px 10px;
    border-radius: 9px;
    background: var(--panel);
    border: 1px solid var(--border-soft);
    font-size: 12.5px;
}

.bigo-row-head {
    background: transparent;
    border: 0;
    color: var(--faint);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.bigo-row span small {
    display: block;
    color: var(--faint);
    font-size: 11px;
}

.bigo-row .mono {
    color: var(--text-strong);
}

.bigo-bar {
    display: block;
    height: 4px;
    margin-top: 4px;
    border-radius: 3px;
    background: var(--panel-3);
    overflow: hidden;
}

.bigo-bar i {
    display: block;
    height: 100%;
    border-radius: 3px;
    transition: width 0.3s;
}

.bigo-status {
    display: block;
    font-style: normal;
    font-weight: 700;
    font-size: 11.5px;
}

.bigo-status.ok {
    color: var(--green);
}

.bigo-status.warn {
    color: var(--amber);
}

.bigo-status.bad {
    color: var(--red-text);
}

.bigo-row.bad {
    border-color: rgba(239, 68, 68, 0.25);
}

/* ═══════════════════════════════ Konten materi v2 ═══════════════════════════════ */
.diagram {
    max-width: 860px;
    margin: 8px 0 20px;
    padding: 16px;
    border-radius: 16px;
    background:
        radial-gradient(circle at 1px 1px, rgba(var(--tint-rgb), 0.045) 1px, transparent 0) 0 0 / 20px 20px,
        var(--canvas);
    border: 1px solid var(--border);
}

.diagram svg {
    display: block;
    width: 100%;
    height: auto;
}

.diagram figcaption {
    margin-top: 10px;
    color: var(--muted);
    font-size: 13px;
    text-align: center;
}

.diagram-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
}

.diagram-grid > div {
    padding: 10px;
    border-radius: 12px;
    background: rgba(var(--glass-rgb), 0.7);
    border: 1px solid var(--border-soft);
}

.diagram-grid h5 {
    margin: 0 0 6px;
    color: var(--text-strong);
    font-size: 13px;
    text-align: center;
}

.dg-node circle {
    fill: url(#dg-node);
    stroke: var(--line-strong);
    stroke-width: 2;
}

.dg-node text,
.dg-text {
    fill: var(--svg-text);
    font: 700 13px var(--mono);
    text-anchor: middle;
    dominant-baseline: central;
}

.dg-small {
    fill: var(--muted);
    font: 600 11px var(--sans);
    text-anchor: middle;
}

.dg-edge {
    stroke: var(--edge);
    stroke-width: 2.5;
    fill: none;
}

.dg-edge.hl {
    stroke: var(--primary);
    stroke-width: 3.5;
}

.dg-edge.ok {
    stroke: var(--green);
    stroke-width: 3.5;
}

.dg-edge.bad {
    stroke: var(--red);
    stroke-width: 3;
    stroke-dasharray: 6 5;
}

.dg-edge.cy {
    stroke: var(--cyan);
    stroke-width: 3;
}

.dg-w {
    fill: var(--hl-text);
    font: 700 12px var(--mono);
    text-anchor: middle;
    dominant-baseline: central;
    paint-order: stroke;
    stroke: var(--canvas);
    stroke-width: 4px;
}

.dg-node.cur circle {
    fill: #f59e0b;
    stroke: var(--hl-text);
}

.dg-node.cur text {
    fill: var(--on-amber);
}

.dg-node.vis circle {
    fill: #4e30b6;
    stroke: var(--violet-text);
}

.dg-node.cyan circle {
    fill: #0e3a46;
    stroke: var(--cyan);
}

.dg-node.green circle {
    fill: #14532d;
    stroke: var(--green);
}

.dg-node.red circle {
    fill: #4c1d1d;
    stroke: var(--red);
}

.dg-ring {
    fill: none;
    stroke-width: 1.5;
    stroke-dasharray: 5 6;
}

.dg-box {
    fill: var(--panel-deep);
    stroke: var(--line-strong);
    stroke-width: 1.5;
}

.dg-box.cur {
    fill: #f59e0b;
    stroke: var(--hl-text);
}

.dg-box.dep {
    fill: rgba(34, 211, 238, 0.12);
    stroke: var(--cyan);
}

.dg-box.dep2 {
    fill: rgba(236, 72, 153, 0.14);
    stroke: var(--pink);
}

.dg-box.ok {
    fill: rgba(34, 197, 94, 0.18);
    stroke: var(--green);
}

.dg-box.bad {
    fill: rgba(239, 68, 68, 0.14);
    stroke: var(--red);
}

/* Tabel jejak manual */
.trace-wrap {
    max-width: 100%;
    overflow-x: auto;
    margin: 6px 0 18px;
    border-radius: 12px;
    border: 1px solid var(--border-soft);
}

.trace-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
}

.trace-table th {
    padding: 9px 12px;
    background: var(--panel-2);
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
    text-align: left;
    white-space: nowrap;
}

.trace-table td {
    padding: 8px 12px;
    border-top: 1px solid var(--border-soft);
    color: var(--text-soft);
    vertical-align: top;
}

.trace-table td.mono,
.trace-table td code {
    font-family: var(--mono);
}

.trace-table tr.hl td {
    background: rgba(245, 158, 11, 0.07);
}

.trace-table tr.ok td {
    background: rgba(34, 197, 94, 0.06);
}

.trace-table .q {
    color: var(--cyan);
    font-family: var(--mono);
}

.trace-table .new {
    color: var(--hl-text);
    font-weight: 700;
}

/* Kartu pola soal */
.pattern-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 12px;
    margin: 6px 0 18px;
}

.pattern {
    padding: 16px;
    border-radius: 14px;
    background: var(--panel);
    border: 1px solid var(--border-soft);
    transition:
        border-color 0.2s,
        transform 0.2s;
}

.pattern:hover {
    border-color: rgba(139, 92, 246, 0.45);
    transform: translateY(-2px);
}

.pattern h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 8px;
    color: var(--text-strong);
    font-size: 14.5px;
}

.pattern p {
    margin: 0 0 6px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.6;
}

.pattern p b {
    color: var(--text);
}

.pattern code {
    padding: 1px 5px;
    border-radius: 5px;
    background: var(--panel-3);
    color: var(--code-inline);
    font-size: 0.88em;
}

.proof {
    max-width: 78ch;
    margin: 6px 0 18px;
    padding: 16px 18px;
    border-radius: 14px;
    border: 1px solid rgba(34, 211, 238, 0.3);
    background: linear-gradient(0deg, rgba(34, 211, 238, 0.06), rgba(34, 211, 238, 0.06)), var(--panel);
    font-size: 14.5px;
    line-height: 1.7;
    color: var(--text-soft);
}

.proof p {
    margin: 0 0 10px;
}

.proof p:last-child {
    margin-bottom: 0;
}

.proof strong {
    color: var(--text-strong);
}

.proof code {
    padding: 1px 6px;
    border-radius: 5px;
    background: var(--panel-3);
    color: var(--text-strong);
}

.lead-box {
    max-width: 78ch;
    margin: 0 0 6px;
    padding: 18px 20px;
    border-radius: 16px;
    background:
        radial-gradient(400px 160px at 100% 0%, rgba(139, 92, 246, 0.16), transparent 70%),
        var(--panel);
    border: 1px solid var(--border-soft);
}

.lead-box h3 {
    margin: 0 0 8px;
    color: var(--text-strong);
    font-size: 15px;
}

.lead-box ul {
    margin: 0;
    padding-left: 20px;
    color: var(--text-soft);
    font-size: 14px;
}

.lead-box li {
    margin-bottom: 4px;
}

/* ═══════════════════════════════ Walkthrough kode C++ ═══════════════════════════════ */
.walkthrough {
    margin: 10px 0 22px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: var(--panel);
    overflow: hidden;
    outline: none;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.25);
}

.walkthrough:focus-visible {
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.5);
}

.wt-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    background:
        radial-gradient(500px 120px at 0% 0%, rgba(99, 102, 241, 0.16), transparent 70%),
        var(--panel);
}

.wt-title {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.wt-title b {
    display: block;
    color: var(--text-strong);
    font-size: 15px;
}

.wt-title small {
    color: var(--faint);
    font-size: 12px;
}

.wt-lang {
    flex: none;
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: #fff;
    font: 800 13px var(--mono);
    box-shadow: 0 6px 18px rgba(99, 102, 241, 0.35);
}

.wt-tools {
    display: flex;
    align-items: center;
    gap: 8px;
}

.wt-mode {
    display: inline-flex;
    padding: 3px;
    border-radius: 9px;
    background: var(--bg-2);
    border: 1px solid var(--border);
}

.wt-mode button {
    height: 28px;
    padding: 0 11px;
    border: 0;
    border-radius: 7px;
    background: transparent;
    color: var(--muted);
    font-size: 12.5px;
    font-weight: 600;
}

.wt-mode button.active {
    background: var(--panel-3);
    color: var(--text-strong);
}

.wt-intro {
    margin: 0;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-soft);
    color: var(--text-soft);
    font-size: 14px;
}

.wt-intro code {
    padding: 1px 6px;
    border-radius: 5px;
    background: var(--panel-3);
    color: var(--code-inline);
    font-size: 0.88em;
}

.wt-body {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
}

.wt-code {
    position: relative;
    max-height: 620px;
    overflow: auto;
    background: var(--code-bg);
    border-right: 1px solid var(--border);
}

.wt-code pre {
    margin: 0;
    padding: 12px 0;
    font-size: 13px;
    line-height: 1.7;
}

.wt-code code.hljs,
.wt-code code {
    display: block;
    min-width: max-content;
    padding: 0 !important;
    background: transparent !important;
    color: var(--code-text);
}

.wl {
    display: block;
    padding-right: 18px;
    border-left: 3px solid transparent;
    cursor: pointer;
    transition:
        background 0.2s,
        opacity 0.2s,
        border-color 0.2s;
}

.wl-n {
    display: inline-block;
    width: 46px;
    padding-right: 14px;
    color: var(--line-strong);
    text-align: right;
    user-select: none;
}

.wl:hover {
    background: rgba(var(--tint-rgb), 0.035);
}

.walkthrough.has-focus .wt-code .wl:not(.on) {
    opacity: 0.4;
}

.wt-code .wl.on {
    background: rgba(139, 92, 246, 0.14);
    border-left-color: var(--primary);
}

.wt-code .wl.on .wl-n {
    color: var(--primary-2);
}

.wt-explain {
    display: flex;
    flex-direction: column;
    min-width: 0;
    max-height: 620px;
}

.wt-progress {
    flex: none;
    height: 3px;
    background: var(--border-soft);
}

.wt-progress i {
    display: block;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--cyan));
    transition: width 0.3s;
}

.wt-steps {
    flex: 1;
    margin: 0;
    padding: 0;
    list-style: none;
    overflow: auto;
}

.walkthrough[data-mode="step"] .wt-step:not(.active) {
    display: none;
}

.wt-step {
    padding: 16px 18px;
    animation: wtIn 0.25s ease;
}

@keyframes wtIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
}

.wt-step-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.wt-num {
    flex: none;
    display: grid;
    place-items: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--grad-primary);
    color: #fff;
    font: 800 13px var(--mono);
}

.wt-step-head b {
    color: var(--text-strong);
    font-size: 15px;
    line-height: 1.35;
}

.wt-lines {
    flex: none;
    margin-left: auto;
    padding: 2px 8px;
    border-radius: 99px;
    background: var(--primary-soft);
    color: var(--primary-2);
    font: 600 11.5px var(--mono);
    white-space: nowrap;
}

.wt-text {
    color: var(--text-soft);
    font-size: 14.5px;
    line-height: 1.75;
}

.wt-text p {
    margin: 0 0 10px;
}

.wt-text ul,
.wt-text ol {
    margin: 0 0 10px;
    padding-left: 20px;
}

.wt-text li {
    margin-bottom: 4px;
}

.wt-text strong {
    color: var(--text-strong);
}

.wt-text code {
    padding: 1px 6px;
    border-radius: 5px;
    background: var(--panel-3);
    border: 1px solid var(--border);
    color: var(--code-inline);
    font-size: 0.86em;
}

.wt-text pre {
    margin: 8px 0 10px;
    padding: 10px 12px;
    border-radius: 8px;
    background: var(--code-bg);
    border: 1px solid var(--border-soft);
    color: var(--code-text);
    font-size: 12.5px;
    line-height: 1.6;
    overflow: auto;
}

.wt-tip,
.wt-warn {
    margin: 10px 0 6px;
    padding: 10px 12px;
    border-radius: 10px;
    font-size: 13.5px;
    line-height: 1.65;
}

.wt-tip {
    background: var(--cyan-soft);
    border: 1px solid rgba(34, 211, 238, 0.3);
}

.wt-warn {
    background: var(--amber-soft);
    border: 1px solid rgba(245, 158, 11, 0.35);
}

.wt-tip::before {
    content: "💡 ";
}

.wt-warn::before {
    content: "⚠️ ";
}

.wt-nav {
    flex: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 10px 14px;
    border-top: 1px solid var(--border-soft);
    background: var(--bg-2);
}

.wt-counter {
    color: var(--muted);
    font-size: 12.5px;
    font-weight: 600;
}

.wt-snippet {
    display: none;
}

.walkthrough[data-mode="all"] .wt-body {
    grid-template-columns: 1fr;
}

.walkthrough[data-mode="all"] .wt-code,
.walkthrough[data-mode="all"] .wt-nav,
.walkthrough[data-mode="all"] .wt-progress {
    display: none;
}

.walkthrough[data-mode="all"] .wt-explain {
    max-height: none;
}

.walkthrough[data-mode="all"] .wt-steps {
    overflow: visible;
}

.walkthrough[data-mode="all"] .wt-step {
    border-bottom: 1px solid var(--border-soft);
    animation: none;
}

.walkthrough[data-mode="all"] .wt-step:last-child {
    border-bottom: 0;
}

.walkthrough[data-mode="all"] .wt-snippet {
    display: block;
    margin: 0 0 12px;
    padding: 8px 0 !important;
    border-radius: 10px;
    background: var(--code-bg) !important;
    border: 1px solid var(--border-soft);
    color: var(--code-text);
    font-size: 12.5px;
    line-height: 1.7;
    overflow: auto;
}

.walkthrough[data-mode="all"] .wt-snippet .wl {
    cursor: default;
}

.wt-sample {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 12px 14px;
    border-top: 1px solid var(--border);
    background: var(--bg-2);
}

.wt-sample small {
    display: block;
    margin-bottom: 4px;
    color: var(--faint);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.wt-sample pre {
    margin: 0;
    max-height: 180px;
    padding: 10px 12px;
    border-radius: 8px;
    background: var(--code-bg);
    border: 1px solid var(--border-soft);
    color: var(--code-text);
    font-size: 12.5px;
    overflow: auto;
}

.wt-alt {
    border-top: 1px solid var(--border);
}

.wt-alt summary {
    padding: 11px 16px;
    color: var(--primary-2);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
}

.wt-alt .code-tabs {
    max-width: none;
    margin: 0 14px 14px;
}

.prose h3 {
    margin: 22px 0 8px;
    color: var(--text-strong);
    font-size: 17px;
    letter-spacing: -0.01em;
}

.prose h3:first-child {
    margin-top: 4px;
}

.prose pre.snippet {
    margin: 6px 0 14px;
    padding: 12px 14px;
    border-radius: 10px;
    background: var(--code-bg);
    border: 1px solid var(--border);
    font-size: 13px;
    line-height: 1.6;
    overflow: auto;
}

.prose pre.snippet code {
    padding: 0;
    border: 0;
    background: transparent !important;
    color: var(--code-text);
    font-size: inherit;
}

/* Panggung visualisasi terbagi: graph di atas, tabel di bawah */
.split-stage {
    display: grid;
    gap: 2px;
}

.split-graph svg.graph {
    max-height: 270px;
}

.split-stage.tall .split-graph svg.graph {
    max-height: 340px;
}

.split-table {
    overflow-x: auto;
    border-top: 1px dashed var(--border);
}

.split-table .dp-wrap {
    padding: 10px 8px 6px;
}

/* Penanda level di dalam materi */
.lvl {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 24px;
    padding: 0 10px;
    border-radius: 99px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.01em;
    white-space: nowrap;
}

.lvl-1 {
    color: #157347;
    background: #e8f7ee;
    border: 1px solid #b7e4c7;
}

.lvl-2 {
    color: #92400e;
    background: #fff7ed;
    border: 1px solid #fed7aa;
}

.lvl-3 {
    color: var(--red-text);
    background: var(--red-soft);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.lesson-section > h2 .lvl {
    margin-left: auto;
}

.level-band {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 34px 0 0;
    padding: 14px 18px;
    border-radius: 14px;
    border: 1px solid var(--border-soft);
    background: var(--panel);
}

.level-band.lvl-band-1 {
    background: linear-gradient(90deg, rgba(34, 197, 94, 0.12), transparent 70%), var(--panel);
    border-color: rgba(34, 197, 94, 0.25);
}

.level-band.lvl-band-2 {
    background: linear-gradient(90deg, rgba(245, 158, 11, 0.12), transparent 70%), var(--panel);
    border-color: rgba(245, 158, 11, 0.25);
}

.level-band.lvl-band-3 {
    background: linear-gradient(90deg, rgba(239, 68, 68, 0.12), transparent 70%), var(--panel);
    border-color: rgba(239, 68, 68, 0.25);
}

.level-band .lb-icon {
    font-size: 26px;
    line-height: 1;
}

.level-band b {
    display: block;
    color: var(--text-strong);
    font-size: 16px;
}

.level-band span {
    color: var(--muted);
    font-size: 13.5px;
}

.level-rail {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 14px;
}

.level-rail a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--muted);
    font-size: 13px;
    transition:
        border-color 0.15s,
        color 0.15s;
}

.level-rail a:hover {
    color: var(--text);
    border-color: var(--primary);
}

.level-rail a b {
    color: var(--text-strong);
}

.toc li.toc-group a {
    margin-top: 10px;
    padding-top: 3px;
    padding-bottom: 3px;
    border-left-color: transparent;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.toc li.toc-group:first-child a {
    margin-top: 0;
}

.toc li.toc-group.l1 a {
    color: #4ade80;
}

.toc li.toc-group.l2 a {
    color: #fbbf24;
}

.toc li.toc-group.l3 a {
    color: var(--red-text);
}

.toc a .toc-dot {
    display: inline-block;
    width: 7px;
    height: 7px;
    margin-right: 7px;
    border-radius: 50%;
    vertical-align: 1px;
}

.toc-dot.l1 {
    background: var(--green);
}

.toc-dot.l2 {
    background: var(--amber);
}

.toc-dot.l3 {
    background: var(--red);
}

/* Diagram tabel DP mini */
.dp-mini {
    display: inline-grid;
    gap: 3px;
    padding: 4px;
    font: 600 12.5px var(--mono);
}

.dp-mini span {
    display: grid;
    place-items: center;
    min-width: 34px;
    height: 32px;
    padding: 0 6px;
    border-radius: 7px;
    background: var(--panel-deep);
    border: 1px solid var(--line-strong);
    color: var(--text-soft);
}

.dp-mini span.h {
    background: transparent;
    border-color: transparent;
    color: var(--faint);
    font-size: 11.5px;
}

.dp-mini span.cur {
    background: var(--amber);
    border-color: var(--hl-text);
    color: var(--on-amber);
}

.dp-mini span.dep {
    background: rgba(34, 211, 238, 0.14);
    border-color: var(--cyan);
    color: #a5f3fc;
}

.dp-mini span.dep2 {
    background: rgba(236, 72, 153, 0.14);
    border-color: var(--pink);
    color: #fbcfe8;
}

.dp-mini span.ok {
    background: rgba(34, 197, 94, 0.18);
    border-color: var(--green);
    color: var(--green-text);
}

.dp-mini span.bad {
    background: rgba(239, 68, 68, 0.12);
    border-color: rgba(239, 68, 68, 0.5);
    color: var(--red-text);
}

.dp-mini span.dim {
    opacity: 0.35;
}

@media (max-width: 1100px) {
    .wt-body {
        grid-template-columns: 1fr;
    }

    .wt-code {
        max-height: 380px;
        border-right: 0;
        border-bottom: 1px solid var(--border);
    }

    .wt-explain {
        max-height: none;
    }
}

@media (max-width: 680px) {
    .wt-sample {
        grid-template-columns: 1fr;
    }

    .wt-title small {
        display: none;
    }

    .wt-step {
        padding: 14px;
    }

    .level-band {
        padding: 12px 14px;
    }
}

/* ═══════════════════════════════ Workspace: petunjuk & visual contoh ═══════════════════════════════ */
.hint-list {
    display: grid;
    gap: 8px;
    margin-top: 10px;
}

.hint-item {
    border-radius: 10px;
    border: 1px solid var(--border-soft);
    background: var(--panel-2);
}

.hint-item summary {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    color: var(--text);
    font-weight: 600;
    font-size: 13.5px;
    cursor: pointer;
    list-style: none;
}

.hint-item summary::-webkit-details-marker {
    display: none;
}

.hint-item summary::after {
    content: "Buka";
    margin-left: auto;
    color: var(--primary-2);
    font-size: 12px;
}

.hint-item[open] summary::after {
    content: "Tutup";
}

.hint-item p {
    margin: 0;
    padding: 0 12px 12px 42px;
    color: var(--hl-text);
    font-size: 13.5px;
}

.hint-num {
    display: grid;
    place-items: center;
    width: 22px;
    height: 22px;
    border-radius: 7px;
    background: var(--amber-soft);
    color: var(--amber);
    font: 800 11px var(--mono);
}

.sample-visual {
    border-top: 1px solid var(--border-soft);
    background:
        radial-gradient(circle at 1px 1px, rgba(var(--tint-rgb), 0.045) 1px, transparent 0) 0 0 / 20px 20px,
        var(--canvas);
}

.sample-visual summary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 12px;
    color: var(--primary-2);
    font-size: 12.5px;
    font-weight: 700;
    cursor: pointer;
    list-style: none;
}

.sample-visual summary::-webkit-details-marker {
    display: none;
}

.sample-visual-body {
    position: relative;
    padding: 4px 8px 10px;
}

.sample-visual-body svg.graph {
    width: 100%;
    max-height: 300px;
}

.sample-visual-body .viz-hint {
    display: none;
}

.mini-grid {
    display: grid;
    gap: 2px;
    width: max-content;
    max-width: 100%;
    margin: 6px auto;
    overflow: auto;
}

.mini-grid span {
    width: 24px;
    height: 24px;
    border-radius: 5px;
    display: grid;
    place-items: center;
    font: 700 11px var(--mono);
    background: var(--panel-2);
    box-shadow: inset 0 0 0 1px var(--border-soft);
    color: var(--muted);
}

.mini-grid span.wall {
    background: var(--edge);
}

.mini-grid span.start {
    background: var(--green);
    color: #04210f;
}

.mini-grid span.end {
    background: var(--red);
    color: #fff;
}

.mini-grid span.land {
    background: #3f7d3a;
}

.mini-grid span.water {
    background: #143247;
}

.mini-grid span.special {
    background: var(--amber);
    color: var(--on-amber);
}

.mini-bars {
    display: flex;
    align-items: flex-end;
    gap: 6px;
    height: 150px;
    padding: 10px 6px 4px;
    overflow-x: auto;
}

.mini-bars div {
    flex: 1 0 22px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    gap: 3px;
    height: 100%;
}

.mini-bars i {
    width: 100%;
    max-width: 34px;
    border-radius: 6px 6px 3px 3px;
    background: linear-gradient(180deg, #a78bfa, #6d4ed8);
}

.mini-bars small {
    color: var(--muted);
    font: 600 10.5px var(--mono);
}

.mini-bars small.idx {
    color: var(--faint);
    font-size: 9.5px;
}

.sample-visual-note {
    margin: 4px 6px 0;
    color: var(--faint);
    font-size: 12px;
    text-align: center;
}

/* Compile error & penilaian di server */
.ce-box {
    border-radius: 12px;
    border: 1px solid rgba(251, 146, 60, 0.4);
    background: rgba(251, 146, 60, 0.07);
    padding: 12px 14px;
    margin-top: 8px;
}

.ce-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    color: #fdba74;
    font-size: 15px;
}

.ce-head span {
    color: var(--muted);
    font-size: 12.5px;
}

.ce-head span b {
    color: #fdba74;
    font-family: var(--mono);
}

.ce-box p {
    margin: 6px 0 10px;
    color: var(--muted);
    font-size: 13px;
}

.ce-box pre.err {
    max-height: 260px;
    overflow: auto;
    margin: 0;
    white-space: pre-wrap;
}

.working::after {
    content: "";
    display: inline-block;
    width: 12px;
    height: 12px;
    margin-left: 8px;
    border-radius: 50%;
    border: 2px solid currentColor;
    border-right-color: transparent;
    vertical-align: -1px;
    animation: spin 0.8s linear infinite;
}

.judge-progress {
    position: relative;
    height: 6px;
    margin-top: 12px;
    border-radius: 99px;
    background: var(--panel-2);
    overflow: hidden;
}

.judge-progress i {
    position: absolute;
    inset: 0 auto 0 0;
    width: 35%;
    border-radius: 99px;
    background: linear-gradient(90deg, var(--primary), var(--cyan));
    animation: judgeSlide 1.2s ease-in-out infinite;
}

@keyframes judgeSlide {
    from {
        left: -35%;
    }

    to {
        left: 100%;
    }
}

/* Track Fondasi */
.track-fondasi .track-icon {
    background: linear-gradient(135deg, #22c55e 0%, #22d3ee 100%);
}

.track-fondasi .bar i {
    background: linear-gradient(90deg, #22c55e, #22d3ee);
}

.pill-fondasi {
    color: #157347;
    background: #e8f7ee;
}

@media (max-width: 1100px) {
    .bigo-body {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 680px) {
    .graph-tools button span {
        display: none;
    }

    .practice-toggle span {
        display: none;
    }

    .bigo-row {
        grid-template-columns: 1fr 1fr;
    }

    .bigo-row > span:last-child {
        grid-column: 1 / -1;
    }
}

/* ═══════════════════════════════ Responsive ═══════════════════════════════ */
@media (max-width: 1100px) {
    .viz-body {
        grid-template-columns: 1fr;
    }

    .viz-side {
        border-left: 0;
        border-top: 1px solid var(--border-soft);
        max-height: none;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }

    .lesson-layout {
        grid-template-columns: 1fr;
    }

    .lesson-aside {
        display: none;
    }
}

@media (max-width: 960px) {
    .hide-md {
        display: none !important;
    }

    .hero,
    .auth-wrap {
        grid-template-columns: 1fr;
    }

    .auth-visual {
        display: none;
    }

    .auth-card {
        justify-self: stretch;
        max-width: none;
    }

    .page-workspace {
        height: auto;
        overflow: auto;
    }

    .workspace {
        flex-direction: column;
    }

    .pane-left {
        flex: none !important;
        max-height: 60vh;
    }

    .gutter-x,
    .gutter-y {
        height: 8px;
        width: auto;
        cursor: default;
    }

    .gutter span {
        display: none;
    }

    .editor-pane {
        flex: none;
        height: 60vh;
    }

    .console-pane {
        flex: none !important;
        height: 380px;
    }
}

@media (max-width: 680px) {
    .hide-sm {
        display: none !important;
    }

    .topbar {
        grid-template-columns: auto 1fr auto;
        padding: 0 10px;
    }

    .main-nav,
    .logo-text {
        display: none;
    }

    .container {
        padding: 22px 14px 60px;
    }

    .hero {
        padding: 22px;
    }

    .lesson-card {
        grid-template-columns: 1fr;
    }

    .lesson-cta {
        align-items: flex-start;
    }

    .sample-io {
        grid-template-columns: 1fr;
    }

    .sample-io > div + div {
        border-left: 0;
        border-top: 1px solid var(--border-soft);
    }

    .table td,
    .table th {
        padding: 10px 8px;
    }

    .viz-player {
        gap: 8px;
    }
}