:root {
    --bg: #0a0e1a;
    --panel-bg: #0d1424;
    --row-bg: #0a0f1d;
    --border: #1c2438;
    --text: #e7ecf7;
    --text-2: #8892ab;
    --text-dim: #4c5573;
    --accent: #f2a65a;
    --accent-soft: rgba(242, 166, 90, 0.10);
    --easy: #5ec98f;
    --hard: #f2705a;
    --keyword: #7fb0f2;
    --string: #9fd88d;
    --comment: #5b6483;
    --danger: #f2705a;
    --purple: #c792ea;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 40px;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 19px;
    color: var(--text);
    text-decoration: none;
}

.navbar { display: flex; gap: 26px; }

.navbar a {
    color: var(--text-2);
    text-decoration: none;
    font-size: 14px;
}

.navbar a:hover { color: var(--text); }
.navbar a.active { color: var(--accent); }

.wrap {
    max-width: 1100px;
    margin: 0 auto;
    padding: 48px 24px 100px;
}

.crumb {
    font-size: 12.5px;
    color: var(--text-dim);
    margin-bottom: 18px;
}

.crumb a { color: var(--text-dim); text-decoration: none; }
.crumb a:hover { color: var(--accent); }

.ptitle-row {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.ptitle-row h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: clamp(26px, 4.5vw, 36px);
    margin: 0;
}

.diff-badge {
    font-size: 12px;
    font-weight: 600;
    padding: 5px 11px;
    border-radius: 6px;
}

.diff-badge.hard {
    color: var(--hard);
    background: rgba(242, 112, 90, .12);
}

.topic-badges {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.topic-badges span {
    font-size: 11.5px;
    color: var(--text-2);
    border: 1px solid var(--border);
    padding: 4px 9px;
    border-radius: 5px;
}

.card {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel-bg);
    margin-bottom: 28px;
    overflow: hidden;
}

.card-title {
    padding: 16px 22px;
    border-bottom: 1px solid var(--border);
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
}

.card-body {
    padding: 20px 22px;
    font-size: 13.5px;
    line-height: 1.75;
    color: var(--text-2);
}

.card-body code {
    background: rgba(255, 255, 255, .06);
    padding: 1px 6px;
    border-radius: 4px;
    color: var(--text);
    font-size: 12.5px;
}

.example {
    margin-top: 12px;
    padding: 12px 14px;
    background: var(--row-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 12.5px;
    color: var(--text-2);
}

.steps-list {
    margin: 0;
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.steps-list li { color: var(--text-2); font-size: 13px; line-height: 1.6; }
.steps-list strong { color: var(--text); }

.switch-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 22px;
    border-bottom: 1px solid var(--border);
    background: var(--row-bg);
}

.seg {
    display: flex;
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 3px;
    gap: 2px;
}

.seg button {
    background: transparent;
    border: none;
    color: var(--text-2);
    font-family: inherit;
    font-size: 12px;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.seg button.active {
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 600;
}

.seg-title {
    font-size: 11px;
    color: var(--text-dim);
    letter-spacing: 0.05em;
    margin-right: 6px;
    text-transform: uppercase;
    align-self: center;
}

.lang-toggle-group { display: flex; gap: 6px; align-items: center; }

.lang-btn {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    color: var(--text-2);
    font-size: 12px;
    padding: 5px 11px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}

.lang-btn.selected {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

.lang-btn input { display: none; }

.code-comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 0;
    border-bottom: 1px solid var(--border);
}

.code-pane {
    border-right: 1px solid var(--border);
    background: var(--panel-bg);
}

.code-pane:last-child { border-right: none; }

.code-pane-header {
    padding: 8px 16px;
    background: var(--row-bg);
    border-bottom: 1px solid var(--border);
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
}

.code-lines { padding: 14px 0; }

.code-line {
    display: flex;
    gap: 12px;
    padding: 2px 16px;
    font-size: 12.5px;
    line-height: 1.8;
    white-space: pre;
    overflow-x: auto;
}

.code-line .ln {
    color: var(--text-dim);
    min-width: 18px;
    text-align: right;
    user-select: none;
}

.code-line.active-line {
    background: var(--accent-soft);
    border-left: 3px solid var(--accent);
}

/* Simulation area */
.sim-visual {
    padding: 20px 22px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* Arrays display */
.arrays-display {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.array-row-wrap {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.array-label {
    font-size: 12px;
    color: var(--text-dim);
    min-width: 52px;
    text-align: right;
}

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

.arr-box {
    position: relative;
    width: 46px;
    height: 46px;
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    background: var(--row-bg);
    transition: all .2s ease;
}

.arr-box .idx {
    position: absolute;
    bottom: -18px;
    font-size: 10px;
    color: var(--text-dim);
}

.arr-box.left-part {
    border-color: var(--keyword);
    background: rgba(127, 176, 242, .08);
}

.arr-box.right-part {
    border-color: var(--border);
    opacity: 0.5;
}

.arr-box.partition-ptr {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.arr-box.median-el {
    border-color: var(--easy);
    background: rgba(94, 201, 143, .12);
    box-shadow: 0 0 0 3px rgba(94, 201, 143, .2);
}

.arr-box.found {
    border-color: var(--easy);
    background: rgba(94, 201, 143, .12);
    box-shadow: 0 0 0 3px rgba(94, 201, 143, .2);
}

/* Partition display */
.partition-display {
    min-height: 46px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    padding: 10px 14px;
    background: var(--row-bg);
    border: 1px dashed var(--border);
    border-radius: 8px;
}

.part-chip {
    font-size: 12px;
    padding: 4px 9px;
    border-radius: 6px;
    background: var(--accent-soft);
    color: var(--accent);
    border: 1px solid rgba(242, 166, 90, .3);
}

.part-chip.ok {
    background: rgba(94, 201, 143, .10);
    color: var(--easy);
    border-color: rgba(94, 201, 143, .3);
}

.part-empty {
    color: var(--text-dim);
    font-size: 12px;
}

.desc-line {
    min-height: 38px;
    font-size: 13px;
    color: var(--text);
    padding: 10px 14px;
    background: var(--row-bg);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.desc-line.win {
    border-color: var(--easy);
    color: var(--easy);
    background: rgba(94, 201, 143, .08);
}

.controls-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 22px;
    border-top: 1px solid var(--border);
    background: var(--row-bg);
    flex-wrap: wrap;
}

.controls-row button {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--panel-bg);
    color: var(--text);
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.controls-row button:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.controls-row button.play {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

.step-count { font-size: 12px; color: var(--text-dim); margin-left: auto; }

.progress-track {
    flex: 1;
    min-width: 100px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    margin: 0 8px;
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    transition: width .2s ease;
}

/* Complexity */
.complexity-body { padding: 22px; }

.complexity-badges {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.cbadge {
    flex: 1;
    min-width: 150px;
    padding: 12px 16px;
    background: var(--row-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
}

.cbadge .label {
    font-size: 11px;
    color: var(--text-dim);
    letter-spacing: .06em;
    margin-bottom: 4px;
}

.cbadge .value {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 18px;
    font-weight: 700;
    color: var(--accent);
}

.chart-wrap {
    background: var(--row-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px;
}

.chart-legend {
    display: flex;
    gap: 18px;
    font-size: 11.5px;
    color: var(--text-2);
    margin-top: 12px;
    flex-wrap: wrap;
}

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

.swatch { width: 10px; height: 10px; border-radius: 2px; }

table.compare {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

table.compare th,
table.compare td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

table.compare th {
    color: var(--text-dim);
    font-size: 11px;
    letter-spacing: .06em;
    font-weight: 600;
}

table.compare td { color: var(--text-2); }
table.compare td.hl { color: var(--accent); font-weight: 600; }
table.compare tr:last-child td { border-bottom: none; }

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
    padding: 5px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s ease;
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width:760px) {
    .hamburger { display: flex; }

    .navbar {
        position: fixed;
        top: 0;
        right: -100%;
        width: 240px;
        height: 100vh;
        background: var(--panel-bg);
        border-left: 1px solid var(--border);
        flex-direction: column;
        justify-content: center;
        align-items: flex-start;
        padding: 40px 30px;
        gap: 16px;
        transition: right 0.35s ease;
        z-index: 999;
    }

    .navbar.nav-open { right: 0; }
    .header { padding: 16px 20px; }
    .wrap { padding: 80px 16px 100px; }

    .code-comparison-grid { grid-template-columns: 1fr; }

    .code-pane {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .complexity-badges { flex-direction: column; }

    .code-line {
        font-size: 11px;
        white-space: pre-wrap;
        word-break: break-all;
    }

    .desc-line, .example { word-wrap: break-word; }
    .cbadge .value { font-size: 14px; }
}