/* ============================================================
   Aizero 知识站 · 全局主题
   暗色科技基调 / 霓虹蓝紫强调 / 玻璃拟态
   ============================================================ */

:root {
    /* 色彩令牌 */
    --bg-deep: #060913;
    --bg-panel: #0b1020;
    --bg-card: rgba(20, 28, 52, 0.55);
    --ink: #e8ecf8;
    --ink-dim: #93a0c0;
    --ink-faint: #5a6788;
    --accent: #4cc9ff;        /* 霓虹蓝 */
    --accent-2: #a06bff;      /* 霓虹紫 */
    --accent-3: #35e8b4;      /* 荧光青 */
    --line: rgba(120, 140, 200, 0.16);
    --glow: 0 0 24px rgba(76, 201, 255, 0.35);

    /* 字体 */
    --font-body: "PingFang SC", "HarmonyOS Sans SC", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

    /* 布局 */
    --max-w: 1180px;
    --radius: 16px;
    --header-h: 64px;
}

/* ============================================================
   可选主题（默认深空不设置 data-theme，原有视觉值保持原样）
   ============================================================ */
html[data-theme="paper"] {
    color-scheme: light;
    --bg-deep: #f7f1e7;
    --bg-panel: #fffaf2;
    --bg-card: rgba(255, 251, 244, 0.78);
    --ink: #26282f;
    --ink-dim: #5d6470;
    --ink-faint: #867d72;
    --accent: #176b87;
    --accent-2: #a75d3f;
    --accent-3: #2e806b;
    --line: rgba(72, 63, 53, 0.16);
    --glow: 0 12px 34px rgba(23, 107, 135, 0.17);
    --theme-header: rgba(247, 241, 231, 0.88);
    --theme-soft: rgba(255, 250, 242, 0.84);
    --theme-solid: #fffaf2;
    --theme-code: #202936;
    --theme-code-ink: #e9f0f7;
    --theme-button-ink: #fffaf2;
    --theme-shadow: 0 16px 42px rgba(72, 63, 53, 0.14);
    --theme-glow-1: rgba(23, 107, 135, 0.10);
    --theme-glow-2: rgba(167, 93, 63, 0.09);
    --theme-glow-3: rgba(46, 128, 107, 0.07);
    --theme-accent-soft: rgba(23, 107, 135, 0.10);
    --theme-accent-line: rgba(23, 107, 135, 0.38);
}

html[data-theme="cloud"] {
    color-scheme: light;
    --bg-deep: #edf4fb;
    --bg-panel: #f8fbff;
    --bg-card: rgba(248, 251, 255, 0.78);
    --ink: #172235;
    --ink-dim: #53627a;
    --ink-faint: #7a899f;
    --accent: #1468bd;
    --accent-2: #7557d5;
    --accent-3: #168d85;
    --line: rgba(55, 78, 110, 0.16);
    --glow: 0 12px 34px rgba(23, 116, 209, 0.16);
    --theme-header: rgba(237, 244, 251, 0.88);
    --theme-soft: rgba(248, 251, 255, 0.84);
    --theme-solid: #f8fbff;
    --theme-code: #17263b;
    --theme-code-ink: #edf5ff;
    --theme-button-ink: #ffffff;
    --theme-shadow: 0 16px 42px rgba(35, 70, 110, 0.14);
    --theme-glow-1: rgba(20, 104, 189, 0.11);
    --theme-glow-2: rgba(117, 87, 213, 0.09);
    --theme-glow-3: rgba(22, 141, 133, 0.07);
    --theme-accent-soft: rgba(20, 104, 189, 0.10);
    --theme-accent-line: rgba(20, 104, 189, 0.38);
}

html[data-theme="forest"] {
    color-scheme: dark;
    --bg-deep: #09110f;
    --bg-panel: #0e1a16;
    --bg-card: rgba(20, 39, 32, 0.62);
    --ink: #e8eee7;
    --ink-dim: #9eafa5;
    --ink-faint: #667d72;
    --accent: #72d6aa;
    --accent-2: #d4a65a;
    --accent-3: #69b7c7;
    --line: rgba(123, 160, 139, 0.18);
    --glow: 0 0 24px rgba(114, 214, 170, 0.24);
    --theme-header: rgba(9, 17, 15, 0.84);
    --theme-soft: rgba(14, 29, 24, 0.86);
    --theme-solid: #0e1a16;
    --theme-code: #06100d;
    --theme-code-ink: #dcebe3;
    --theme-button-ink: #07110d;
    --theme-shadow: 0 16px 42px rgba(0, 0, 0, 0.34);
    --theme-glow-1: rgba(114, 214, 170, 0.10);
    --theme-glow-2: rgba(212, 166, 90, 0.08);
    --theme-glow-3: rgba(105, 183, 199, 0.06);
    --theme-accent-soft: rgba(114, 214, 170, 0.10);
    --theme-accent-line: rgba(114, 214, 170, 0.38);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    background: var(--bg-deep);
    color: var(--ink);
    font-family: var(--font-body);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 全局渐变底纹 */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    background:
        radial-gradient(ellipse 60% 40% at 15% 0%, rgba(76, 201, 255, 0.10), transparent 60%),
        radial-gradient(ellipse 50% 40% at 90% 20%, rgba(160, 107, 255, 0.10), transparent 60%),
        radial-gradient(ellipse 70% 50% at 50% 110%, rgba(53, 232, 180, 0.06), transparent 60%);
    pointer-events: none;
}

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

::selection { background: rgba(76, 201, 255, 0.35); }

/* ---------- 通用容器 ---------- */
.container {
    width: min(var(--max-w), 92vw);
    margin: 0 auto;
}

/* ---------- 顶部导航 ---------- */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-h);
    z-index: 100;
    display: flex;
    align-items: center;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    background: rgba(6, 9, 19, 0.6);
    border-bottom: 1px solid var(--line);
}

.site-header .container {
    display: flex;
    align-items: center;
    gap: 28px;
    position: relative;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 18px;
    letter-spacing: 0.5px;
    color: var(--ink);
    flex: none;
}

.brand .logo-mark {
    width: 30px; height: 30px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    display: grid;
    place-items: center;
    font-size: 14px;
    color: #05070f;
    font-weight: 800;
    box-shadow: var(--glow);
}

.brand em {
    font-style: normal;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.nav-links {
    display: flex;
    gap: 26px;
    font-size: 14px;
    margin-left: auto;
}

.nav-links a {
    color: var(--ink-dim);
    padding: 6px 2px;
    position: relative;
    white-space: nowrap;
    transition: color 0.25s;
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0; bottom: 0;
    width: 100%; height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s;
    border-radius: 2px;
}

.nav-links a:hover,
.nav-links a.active { color: var(--ink); }
.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }

.account-entry {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-width: 76px;
    flex: none;
    color: var(--ink);
    font-size: 13px;
    white-space: nowrap;
}

.account-avatar {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    overflow: hidden;
    border: 1px solid rgba(76, 201, 255, 0.42);
    border-radius: 50%;
    color: var(--accent);
    background: rgba(76, 201, 255, 0.1);
    font-size: 12px;
    font-weight: 700;
}

.account-avatar img { width: 100%; height: 100%; object-fit: cover; }
.account-entry:hover .account-name { color: var(--accent); }

/* ---------- 风格选择器 ---------- */
.theme-picker { position: relative; flex: none; }
.theme-trigger {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    height: 34px;
    padding: 0 10px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink-dim);
    background: transparent;
    font: 12px/1 var(--font-body);
    cursor: pointer;
    transition: color .2s, border-color .2s, background .2s;
}
.theme-trigger:hover,
.theme-trigger[aria-expanded="true"] {
    color: var(--ink);
    border-color: var(--theme-accent-line, rgba(76, 201, 255, 0.42));
    background: var(--theme-accent-soft, rgba(76, 201, 255, 0.08));
}
.theme-trigger-mark {
    width: 14px;
    height: 14px;
    border: 1px solid currentColor;
    border-radius: 50%;
    background: linear-gradient(90deg, currentColor 50%, transparent 50%);
}
.theme-menu {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    width: 310px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 16px;
    color: var(--ink);
    background: var(--theme-solid, rgba(11, 16, 32, 0.98));
    box-shadow: var(--theme-shadow, 0 20px 54px rgba(0, 0, 0, 0.5));
    backdrop-filter: blur(18px);
}
.theme-menu[hidden] { display: none; }
.theme-menu-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 14px; padding: 2px 4px 11px; }
.theme-menu-heading b { font-size: 14px; }
.theme-menu-heading span { color: var(--ink-faint); font-size: 10px; }
.theme-options { display: grid; gap: 5px; }
.theme-option {
    display: grid;
    grid-template-columns: 58px 1fr 18px;
    gap: 10px;
    align-items: center;
    width: 100%;
    padding: 10px;
    border: 1px solid transparent;
    border-radius: 11px;
    color: var(--ink);
    background: transparent;
    text-align: left;
    cursor: pointer;
}
.theme-option:hover { background: var(--theme-accent-soft, rgba(76, 201, 255, 0.07)); }
.theme-option[aria-checked="true"] { border-color: var(--theme-accent-line, rgba(76, 201, 255, 0.35)); background: var(--theme-accent-soft, rgba(76, 201, 255, 0.08)); }
.theme-swatches { display: flex; overflow: hidden; height: 28px; border: 1px solid var(--line); border-radius: 8px; }
.theme-swatches i { flex: 1; background: var(--swatch); }
.theme-option-copy b,
.theme-option-copy small { display: block; }
.theme-option-copy b { font-size: 13px; }
.theme-option-copy small { margin-top: 3px; color: var(--ink-faint); font-size: 10px; }
.theme-check { color: var(--accent); opacity: 0; font-weight: 700; }
.theme-option[aria-checked="true"] .theme-check { opacity: 1; }

/* 非默认主题只覆盖硬编码的深色表面；深空主题不经过这些规则。 */
html[data-theme] body::before {
    background:
        radial-gradient(ellipse 60% 40% at 15% 0%, var(--theme-glow-1), transparent 60%),
        radial-gradient(ellipse 50% 40% at 90% 20%, var(--theme-glow-2), transparent 60%),
        radial-gradient(ellipse 70% 50% at 50% 110%, var(--theme-glow-3), transparent 60%);
}
html[data-theme] ::selection { background: var(--theme-accent-line); }
html[data-theme] .site-header { background: var(--theme-header); }
html[data-theme] .account-avatar { border-color: var(--theme-accent-line); background: var(--theme-accent-soft); }
html[data-theme] .card:hover { border-color: var(--theme-accent-line); box-shadow: var(--theme-shadow), var(--glow); }
html[data-theme] .btn { color: var(--theme-button-ink); box-shadow: var(--glow); }
html[data-theme] .btn.ghost { color: var(--ink); box-shadow: none; }
html[data-theme] .code-block { background: var(--theme-code); color: var(--theme-code-ink); }
html[data-theme] .track-badge { background: var(--theme-soft); }
html[data-theme] .buzz-chip.hot { box-shadow: var(--theme-shadow), var(--glow); }
html[data-theme] .sm-link { stroke: var(--theme-accent-line); }
html[data-theme] .pt-back { background: var(--theme-soft) !important; }
html[data-theme] .ask { background: var(--theme-soft) !important; }

html[data-theme="paper"] .track-tech-card,
html[data-theme="paper"] .track-practice-card,
html[data-theme="cloud"] .track-tech-card,
html[data-theme="cloud"] .track-practice-card {
    color: #e8ecf8;
}
html[data-theme="paper"] .track-tech-card h3,
html[data-theme="cloud"] .track-tech-card h3 { color: #64d8ff; }
html[data-theme="paper"] .track-practice-card .term-line,
html[data-theme="cloud"] .track-practice-card .term-line { color: #55edbd; }
html[data-theme="paper"] .term-head span,
html[data-theme="paper"] .term-body .out,
html[data-theme="cloud"] .term-head span,
html[data-theme="cloud"] .term-body .out { color: #aebad2; }
html[data-theme="paper"] .term-body .cmd,
html[data-theme="cloud"] .term-body .cmd { color: #55edbd; }
html[data-theme] .buzz-box { background: var(--theme-soft) !important; }
html[data-theme] .arsenal-card:hover,
html[data-theme] .rail-poster:hover,
html[data-theme] .track-card:hover { box-shadow: var(--theme-shadow), var(--glow) !important; }
html[data-theme] .palette-input,
html[data-theme] .kbd-hint kbd,
html[data-theme] .palette-list kbd { background: var(--theme-soft) !important; }

/* ---------- 标题排版 ---------- */
.kicker {
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 3px;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 14px;
}

h1.display {
    font-size: clamp(38px, 6vw, 68px);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: 1px;
}

h1.display .grad {
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 55%, var(--accent-3) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.subtitle {
    color: var(--ink-dim);
    font-size: clamp(15px, 2vw, 18px);
    max-width: 640px;
}

/* ---------- 玻璃卡片 ---------- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 26px;
    position: relative;
    overflow: hidden;
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.35s, box-shadow 0.35s;
}

.card:hover {
    transform: translateY(-6px);
    border-color: rgba(76, 201, 255, 0.45);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45), var(--glow);
}

/* 卡片顶部流光 */
.card::before {
    content: "";
    position: absolute;
    top: 0; left: -60%;
    width: 60%; height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    transition: left 0.6s ease;
}
.card:hover::before { left: 100%; }

.card .idx {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--ink-faint);
    letter-spacing: 2px;
}

.card h3 {
    font-size: 20px;
    margin: 8px 0 10px;
}

.card p {
    color: var(--ink-dim);
    font-size: 14px;
}

/* ---------- 网格 ---------- */
.grid-6 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 22px;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 26px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    color: #05070f;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    border: none;
    cursor: pointer;
    transition: transform 0.25s, box-shadow 0.25s;
    box-shadow: 0 4px 24px rgba(76, 201, 255, 0.35);
}

.btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 32px rgba(76, 201, 255, 0.5);
}

.btn.ghost {
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--line);
    box-shadow: none;
}
.btn.ghost:hover { border-color: var(--accent); box-shadow: var(--glow); }

/* ---------- 章节 ---------- */
section.block {
    padding: 90px 0;
    position: relative;
}

.section-head {
    margin-bottom: 46px;
}

.section-head h2 {
    font-size: clamp(26px, 3.5vw, 40px);
    font-weight: 700;
}

/* ---------- 代码打字机 ---------- */
.code-block {
    background: rgba(4, 7, 15, 0.85);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 22px 26px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.9;
    overflow-x: auto;
    position: relative;
}

.code-block .code-dots {
    display: flex;
    gap: 7px;
    margin-bottom: 14px;
}
.code-block .code-dots i {
    width: 11px; height: 11px;
    border-radius: 50%;
    background: #2a3350;
}
.code-block .code-dots i:nth-child(1) { background: #ff5f57; }
.code-block .code-dots i:nth-child(2) { background: #febc2e; }
.code-block .code-dots i:nth-child(3) { background: #28c840; }

.c-kw { color: var(--accent-2); }
.c-fn { color: var(--accent); }
.c-str { color: var(--accent-3); }
.c-com { color: var(--ink-faint); font-style: italic; }
.c-num { color: #ffb86c; }

.caret {
    display: inline-block;
    width: 8px; height: 1.1em;
    background: var(--accent);
    vertical-align: text-bottom;
    animation: blink 0.9s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- SVG 描边动画 ---------- */
.draw-svg path,
.draw-svg line,
.draw-svg circle {
    stroke-dasharray: var(--dash, 1000);
    stroke-dashoffset: var(--dash, 1000);
}

/* ---------- 页脚 ---------- */
.site-footer {
    border-top: 1px solid var(--line);
    padding: 40px 0;
    color: var(--ink-faint);
    font-size: 13px;
    text-align: center;
}

/* ---------- View Transitions ---------- */
::view-transition-old(root),
::view-transition-new(root) {
    animation-duration: 0.45s;
}

.vt-circle::view-transition-new(root) {
    animation: vt-circle-in 0.55s cubic-bezier(0.4, 0, 0.2, 1);
    clip-path: circle(0% at 50% 50%);
    animation-fill-mode: forwards;
}
@keyframes vt-circle-in {
    to { clip-path: circle(142% at 50% 50%); }
}
.vt-circle::view-transition-old(root) {
    animation: none;
}

/* ---------- 空状态 ---------- */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--ink-dim);
}

.empty-state .orbit {
    width: 120px; height: 120px;
    margin: 0 auto 30px;
    position: relative;
}
.empty-state .orbit .core {
    position: absolute;
    inset: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: var(--glow);
    animation: pulse 2.4s ease-in-out infinite;
}
.empty-state .orbit .ring {
    position: absolute;
    inset: 0;
    border: 1px dashed rgba(120, 140, 200, 0.4);
    border-radius: 50%;
    animation: spin 9s linear infinite;
}
.empty-state .orbit .ring::after {
    content: "";
    position: absolute;
    top: -4px; left: 50%;
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent-3);
    box-shadow: 0 0 10px var(--accent-3);
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.18); }
}

/* ---------- 轨道徽标（四种阅读轨道） ---------- */
.track-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 1px;
    padding: 3px 11px;
    border-radius: 999px;
    border: 1px solid var(--line);
    color: var(--ink-dim);
    background: rgba(11, 16, 32, 0.6);
    white-space: nowrap;
}
.track-badge::before {
    content: "";
    width: 5px; height: 5px;
    border-radius: 50%;
    background: currentColor;
}
.track-kepu    { color: #7fd4ff; border-color: rgba(76, 201, 255, 0.35); }
.track-tech    { color: #bfa0ff; border-color: rgba(160, 107, 255, 0.35); }
.track-practice{ color: #5cf0c4; border-color: rgba(53, 232, 180, 0.35); }
.track-ent     { color: #ffc985; border-color: rgba(255, 184, 108, 0.35); }

/* ---------- 星图（SVG 星座） ---------- */
.starmap {
    width: 100%;
    height: auto;
    display: block;
}
.starmap text { user-select: none; }
.sm-twinkle {
    animation: sm-twinkle 3s ease-in-out infinite;
    opacity: 0.2;
}
@keyframes sm-twinkle {
    0%, 100% { opacity: 0.12; }
    50% { opacity: 0.85; }
}
.sm-link {
    stroke: rgba(120, 145, 205, 0.34);
    stroke-width: 1;
}
.sm-link-x {
    stroke: rgba(120, 145, 205, 0.22);
    stroke-dasharray: 3 7;
}
.sm-runner {
    fill: #bfeaff;
    filter: drop-shadow(0 0 6px rgba(76, 201, 255, 0.9));
}
.sm-layer-stars,
.sm-layer-links,
.sm-layer-nodes { transition: transform 0.25s ease-out; }

.sm-node { cursor: pointer; outline: none; }
.sm-globe { transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1); transform-box: fill-box; transform-origin: center; }
.sm-halo {
    fill: url(#sm-halo-grad);
    opacity: 0.35;
    transition: opacity 0.35s;
}
.sm-ring {
    fill: none;
    stroke: rgba(76, 201, 255, 0.55);
    stroke-width: 1;
    transition: stroke 0.35s, transform 0.35s;
    transform-box: fill-box;
    transform-origin: center;
}
.sm-core {
    fill: #eaf6ff;
    filter: drop-shadow(0 0 8px rgba(76, 201, 255, 0.85));
}
.sm-node:hover .sm-globe,
.sm-node:focus-visible .sm-globe { transform: scale(1.14); }
.sm-node:hover .sm-halo { opacity: 0.8; }
.sm-node:hover .sm-ring { stroke: var(--accent); }
.sm-en {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 2.5px;
    fill: var(--accent);
    text-transform: uppercase;
}
.sm-label { font-size: 17px; font-weight: 700; fill: var(--ink); }
.sm-desc { font-size: 12px; fill: var(--ink-dim); }
.sm-count { font-family: var(--font-mono); font-size: 11px; fill: var(--ink-faint); letter-spacing: 1px; }

/* 中心节点：脉动 + 渐变环 */
.sm-center .sm-core {
    fill: url(#sm-core-grad);
    filter: drop-shadow(0 0 14px rgba(76, 201, 255, 0.9));
}
.sm-center .sm-ring {
    stroke: rgba(160, 107, 255, 0.6);
    animation: sm-pulse 3.2s ease-in-out infinite;
}
@keyframes sm-pulse {
    0%, 100% { transform: scale(1); opacity: 0.9; }
    50% { transform: scale(1.12); opacity: 0.45; }
}

/* 移动端降级列表 */
.sm-fallback { display: flex; flex-direction: column; gap: 12px; }
.sm-fb-center {
    text-align: center;
    padding: 18px;
    border-radius: var(--radius);
    border: 1px solid rgba(76, 201, 255, 0.4);
    background: radial-gradient(circle at 50% 0%, rgba(76, 201, 255, 0.12), transparent 70%);
    color: var(--ink);
}
.sm-fb-center b { font-size: 20px; letter-spacing: 2px; }
.sm-fb-center span, .sm-fb-item i {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--ink-faint);
    letter-spacing: 2px;
    font-style: normal;
}
.sm-fb-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: var(--bg-card);
    color: var(--ink);
    transition: border-color 0.3s, transform 0.3s;
}
.sm-fb-item:hover { border-color: rgba(76, 201, 255, 0.45); transform: translateX(6px); }
.sm-fb-dot {
    width: 10px; height: 10px;
    flex: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: 0 0 10px rgba(76, 201, 255, 0.7);
}
.sm-fb-body { flex: 1; min-width: 0; }
.sm-fb-body b { font-size: 15px; }
.sm-fb-body p { font-size: 12px; color: var(--ink-dim); margin-top: 3px; }
.sm-fb-arrow { color: var(--ink-faint); }

/* ---------- 3D 倾斜流光 ---------- */
[data-tilt] { transform-style: preserve-3d; transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1); }
.tilt-shine {
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(560px circle at var(--sx, 50%) var(--sy, 50%), rgba(255, 255, 255, 0.10), transparent 42%);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s;
}
[data-tilt]:hover .tilt-shine { opacity: 1; }

/* ---------- 热潮观察词云轮播 ---------- */
.buzz { overflow: hidden; position: relative; }
.buzz::before,
.buzz::after {
    content: "";
    position: absolute;
    top: 0; bottom: 0;
    width: 90px;
    z-index: 2;
    pointer-events: none;
}
.buzz::before { left: 0; background: linear-gradient(90deg, var(--bg-deep), transparent); }
.buzz::after { right: 0; background: linear-gradient(-90deg, var(--bg-deep), transparent); }
.buzz-track {
    display: flex;
    gap: 14px;
    width: max-content;
    animation: buzz-marquee 36s linear infinite;
}
.buzz:hover .buzz-track { animation-play-state: paused; }
@keyframes buzz-marquee { to { transform: translateX(-50%); } }
.buzz-chip {
    display: inline-flex;
    align-items: baseline;
    gap: 9px;
    padding: 10px 20px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: var(--bg-card);
    font-size: 15px;
    color: var(--ink-dim);
    white-space: nowrap;
    transition: border-color 0.4s, color 0.4s, box-shadow 0.4s, transform 0.4s;
}
.buzz-chip .buzz-stage {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 1.5px;
    color: var(--ink-faint);
    transition: color 0.4s;
}
.buzz-chip.hot {
    border-color: rgba(76, 201, 255, 0.6);
    color: var(--ink);
    transform: translateY(-3px);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.4), var(--glow);
}
.buzz-chip.hot .buzz-stage { color: var(--accent); }

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ---------- 移动端 ---------- */
@media (max-width: 720px) {
    .site-header .container { gap: 16px; }
    .nav-links { gap: 16px; font-size: 13px; }
    .nav-links a:nth-child(3), .nav-links a:nth-child(4) { display: none; }
    section.block { padding: 60px 0; }
    .card { padding: 20px; }
    .theme-trigger-label { display: none; }
    .theme-trigger { width: 34px; padding: 0; justify-content: center; }
}

@media (max-width: 480px) {
    .brand em { display: none; }
    .nav-links { display: none; }
    .account-entry { margin-left: auto; min-width: 0; }
    .account-name { max-width: 72px; overflow: hidden; text-overflow: ellipsis; }
    .theme-menu { position: fixed; top: calc(var(--header-h) + 8px); left: 4vw; right: 4vw; width: auto; }
}