:root {
    --bg0: #0c1016;
    --bg1: #121924;
    --bg2: #182233;
    --bg3: #1f2c40;
    --line: rgba(212, 168, 83, 0.18);
    --text: #e7ecf3;
    --muted: #93a0b4;
    --faint: #6b788c;
    --accent: #d4a853;
    --accent-2: #5ec8c0;
    --danger: #e07070;
    --ok: #7dce9a;
    --card: rgba(18, 25, 36, 0.92);
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
    --radius: 14px;
    --nav-w: 280px;
    --top-h: 58px;
    --font-display: "ZCOOL XiaoWei", "Noto Serif SC", "Songti SC", serif;
    --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-mono: "JetBrains Mono", "Sarasa Mono SC", Consolas, monospace;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    background: var(--bg0);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

body {
    background:
        radial-gradient(1200px 600px at 10% -10%, rgba(212, 168, 83, 0.12), transparent 55%),
        radial-gradient(900px 500px at 100% 0%, rgba(94, 200, 192, 0.08), transparent 50%),
        linear-gradient(180deg, #0e141d 0%, #0b0f15 100%);
}

a {
    color: var(--accent-2);
    text-decoration: none;
}

a:hover {
    color: var(--accent);
}

button,
input {
    font: inherit;
}

/* —— Top bar —— */
.topbar {
    position: sticky;
    top: 0;
    z-index: 40;
    height: var(--top-h);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 16px;
    border-bottom: 1px solid var(--line);
    background: rgba(12, 16, 22, 0.86);
    backdrop-filter: blur(14px);
}

.brand {
    display: flex;
    align-items: baseline;
    gap: 8px;
    min-width: 0;
    flex: 0 1 auto;
}

.brand-mark {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: 0 0 0 3px rgba(212, 168, 83, 0.15);
}

.brand-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.brand-sub {
    color: var(--faint);
    font-size: 0.75rem;
    white-space: nowrap;
}

.menu-btn {
    display: none;
    border: 1px solid var(--line);
    background: var(--bg2);
    color: var(--text);
    border-radius: 10px;
    padding: 8px 12px;
    cursor: pointer;
}

.search-wrap {
    flex: 1;
    max-width: 520px;
    margin-left: auto;
    position: relative;
}

.search-wrap input {
    width: 100%;
    border: 1px solid var(--line);
    background: var(--bg1);
    color: var(--text);
    border-radius: 999px;
    padding: 9px 14px 9px 38px;
    outline: none;
}

.search-wrap input:focus {
    border-color: rgba(212, 168, 83, 0.55);
    box-shadow: 0 0 0 3px rgba(212, 168, 83, 0.12);
}

.search-wrap::before {
    content: "⌕";
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-52%);
    color: var(--faint);
    font-size: 1rem;
}

.search-panel {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    max-height: 360px;
    overflow: auto;
    background: var(--bg1);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.search-panel.open {
    display: block;
}

.search-hit {
    display: block;
    width: 100%;
    text-align: left;
    border: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    background: transparent;
    color: var(--text);
    padding: 10px 14px;
    cursor: pointer;
}

.search-hit:hover,
.search-hit:focus {
    background: var(--bg3);
}

.search-hit .t {
    color: var(--accent);
    font-size: 0.85rem;
}

.search-hit .s {
    color: var(--muted);
    font-size: 0.78rem;
    margin-top: 2px;
}

/* —— Layout —— */
.shell {
    display: grid;
    grid-template-columns: var(--nav-w) 1fr;
    min-height: calc(100vh - var(--top-h));
}

.sidebar {
    position: sticky;
    top: var(--top-h);
    height: calc(100vh - var(--top-h));
    overflow: auto;
    border-right: 1px solid var(--line);
    background: rgba(10, 14, 20, 0.72);
    padding: 14px 10px 40px;
}

.nav-group {
    margin-bottom: 16px;
}

.nav-group-title {
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--faint);
    padding: 6px 10px;
}

.nav-link {
    display: block;
    padding: 8px 12px;
    border-radius: 10px;
    color: var(--muted);
    font-size: 0.92rem;
    transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.nav-link:hover {
    color: var(--text);
    background: rgba(255, 255, 255, 0.04);
}

.nav-link.active {
    color: #1a1408;
    background: linear-gradient(90deg, var(--accent), #e0c07a);
    font-weight: 600;
}

.main {
    min-width: 0;
    padding: 28px 28px 80px;
}

.article {
    max-width: 880px;
    margin: 0 auto;
    animation: rise 0.35s ease both;
}

@keyframes rise {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: none;
    }
}

.meta-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 18px;
}

.chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid var(--line);
    background: var(--bg2);
    color: var(--muted);
    border-radius: 999px;
    padding: 4px 10px;
    font-size: 0.75rem;
}

.chip strong {
    color: var(--accent);
    font-weight: 600;
}

/* —— Home —— */
.hero {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: calc(var(--radius) + 4px);
    background:
        linear-gradient(135deg, rgba(212, 168, 83, 0.12), transparent 40%),
        linear-gradient(225deg, rgba(94, 200, 192, 0.1), transparent 45%),
        var(--bg1);
    padding: 36px 28px 28px;
    box-shadow: var(--shadow);
    margin-bottom: 28px;
}

.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    margin: 0 0 10px;
    letter-spacing: 0.06em;
    line-height: 1.25;
}

.hero p {
    margin: 0;
    max-width: 40rem;
    color: var(--muted);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    padding: 10px 16px;
    border: 1px solid var(--line);
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease;
}

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

.btn-primary {
    background: linear-gradient(90deg, var(--accent), #e8c778);
    color: #1a1408;
    border-color: transparent;
    font-weight: 700;
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 14px;
}

.card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--card);
    padding: 16px;
    transition: border-color 0.15s ease, transform 0.15s ease;
    cursor: pointer;
    color: inherit;
    text-align: left;
    width: 100%;
}

.card:hover {
    border-color: rgba(212, 168, 83, 0.45);
    transform: translateY(-2px);
}

.card h3 {
    margin: 0 0 6px;
    font-family: var(--font-display);
    font-size: 1.15rem;
    color: var(--accent);
}

.card p {
    margin: 0;
    color: var(--muted);
    font-size: 0.88rem;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    margin: 8px 0 14px;
    letter-spacing: 0.04em;
}

/* —— Markdown content —— */
.md-body h1,
.md-body h2,
.md-body h3,
.md-body h4 {
    font-family: var(--font-display);
    line-height: 1.35;
    scroll-margin-top: calc(var(--top-h) + 12px);
}

.md-body h1 {
    font-size: 1.9rem;
    margin: 0 0 16px;
    letter-spacing: 0.03em;
}

.md-body h2 {
    font-size: 1.35rem;
    margin: 28px 0 12px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--line);
    color: #f0d7a0;
}

.md-body h3 {
    font-size: 1.12rem;
    margin: 22px 0 10px;
    color: var(--accent-2);
}

.md-body h4 {
    font-size: 1rem;
    margin: 18px 0 8px;
}

.md-body p {
    margin: 0 0 12px;
}

.md-body .anchor {
    opacity: 0;
    margin-right: 6px;
    color: var(--faint);
    font-weight: 400;
}

.md-body h2:hover .anchor,
.md-body h3:hover .anchor {
    opacity: 1;
}

.md-body blockquote {
    margin: 12px 0;
    padding: 10px 14px;
    border-left: 3px solid var(--accent);
    background: rgba(212, 168, 83, 0.08);
    color: var(--muted);
    border-radius: 0 10px 10px 0;
}

.md-body ul,
.md-body ol {
    margin: 0 0 14px;
    padding-left: 1.3rem;
}

.md-body li {
    margin: 4px 0;
}

.md-body hr {
    border: 0;
    border-top: 1px solid var(--line);
    margin: 24px 0;
}

.md-body code {
    font-family: var(--font-mono);
    font-size: 0.86em;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 6px;
    padding: 1px 6px;
    color: #f2e2b8;
}

.md-body pre.code-block {
    overflow: auto;
    background: #0a0e14;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 14px 16px;
    margin: 12px 0 18px;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.md-body pre.code-block code {
    background: transparent;
    border: 0;
    padding: 0;
    color: #c9d4e4;
    font-size: 0.82rem;
    line-height: 1.55;
    white-space: pre;
}

.table-wrap {
    overflow-x: auto;
    margin: 12px 0 18px;
    border: 1px solid var(--line);
    border-radius: 12px;
}

.md-body table {
    width: 100%;
    border-collapse: collapse;
    min-width: 520px;
    font-size: 0.9rem;
}

.md-body th,
.md-body td {
    padding: 10px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    text-align: left;
    vertical-align: top;
}

.md-body thead th {
    background: var(--bg3);
    color: var(--accent);
    font-weight: 600;
    white-space: nowrap;
}

.md-body tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

.md-body tbody tr:hover {
    background: rgba(94, 200, 192, 0.06);
}

.footer-note {
    margin-top: 36px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    color: var(--faint);
    font-size: 0.8rem;
}

.backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 30;
}

/* —— Mobile —— */
@media (max-width: 900px) {
    .menu-btn {
        display: inline-flex;
    }

    .brand-sub {
        display: none;
    }

    .shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        top: var(--top-h);
        left: 0;
        bottom: 0;
        width: min(86vw, 320px);
        z-index: 35;
        transform: translateX(-105%);
        transition: transform 0.22s ease;
        box-shadow: var(--shadow);
    }

    body.nav-open .sidebar {
        transform: none;
    }

    body.nav-open .backdrop {
        display: block;
    }

    .main {
        padding: 18px 14px 64px;
    }

    .hero {
        padding: 26px 18px 20px;
    }

    .search-wrap {
        max-width: none;
        margin-left: 0;
        flex: 1;
    }
}