/* ============================================================
   黑料 · Lens Radar 设计系统
   视觉概念：深空追踪雷达 —— 24 小时扫描全网热点的"料镜"
   主色：信号橙红 | 辅助：霓虹薄荷 / 热度金 | 基底：深空墨蓝
   ============================================================ */

:root {
  /* 色彩 */
  --bg: #070b17;
  --bg-deep: #04070f;
  --panel: #0d1428;
  --panel-2: #111a33;
  --line: rgba(154, 163, 191, .16);
  --ink: #f2f4fa;
  --ink-dim: #9aa3bf;
  --ink-faint: #5d668a;
  --signal: #ff4d2e;
  --signal-soft: rgba(255, 77, 46, .14);
  --mint: #3dffc5;
  --gold: #ffc53d;
  --violet: #8b7cff;
  --pink: #ff5da2;

  /* 字体 */
  --font-cn: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, sans-serif;
  --font-display: "Arial Black", "Impact", "DIN Alternate", "Franklin Gothic Heavy", var(--font-cn);

  /* 圆角 */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-pill: 999px;

  /* 阴影与发光 */
  --shadow-card: 0 10px 40px rgba(2, 5, 14, .55);
  --glow-signal: 0 0 0 1px rgba(255, 77, 46, .35), 0 8px 40px rgba(255, 77, 46, .28);
  --glow-mint: 0 0 0 1px rgba(61, 255, 197, .3), 0 8px 40px rgba(61, 255, 197, .18);

  /* 布局 */
  --container: 1200px;
  --gutter: clamp(16px, 4vw, 32px);
  --nav-h: 68px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-cn);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
:focus-visible { outline: 2px solid var(--mint); outline-offset: 3px; border-radius: 4px; }

/* ---------- 氛围背景：噪点 + 光晕 + 雷达网格 ---------- */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(52vw 42vw at 78% -8%, rgba(139, 124, 255, .16), transparent 62%),
    radial-gradient(46vw 38vw at -12% 24%, rgba(255, 77, 46, .13), transparent 60%),
    radial-gradient(40vw 34vw at 50% 118%, rgba(61, 255, 197, .10), transparent 62%),
    var(--bg-deep);
}
body::after {
  content: "";
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  opacity: .05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}
.grid-lines {
  position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(rgba(154, 163, 191, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(154, 163, 191, .05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(80% 60% at 50% 20%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(80% 60% at 50% 20%, #000 30%, transparent 78%);
}

/* ---------- 容器与排版 ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 700; letter-spacing: .28em; text-transform: uppercase;
  color: var(--mint);
}
.kicker::before {
  content: ""; width: 26px; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--mint), transparent);
}
.kicker--signal { color: var(--signal); }
.kicker--signal::before { background: linear-gradient(90deg, var(--signal), transparent); }
.kicker--gold { color: var(--gold); }
.kicker--gold::before { background: linear-gradient(90deg, var(--gold), transparent); }

.display-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.08;
  letter-spacing: -.01em;
  text-transform: uppercase;
}
.stroke-text {
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(242, 244, 250, .55);
}
.grad-text {
  background: linear-gradient(100deg, var(--signal) 10%, var(--gold) 55%, var(--pink) 90%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.grad-text--mint {
  background: linear-gradient(100deg, var(--mint), #7fffd4 60%, var(--violet));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.display-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}
.led {
  display: inline-block; width: 9px; height: 9px; border-radius: 50%;
  background: var(--signal); box-shadow: 0 0 12px var(--signal);
  animation: led-blink 1.6s ease-in-out infinite;
}
.led--mint { background: var(--mint); box-shadow: 0 0 12px var(--mint); animation-delay: .4s; }
@keyframes led-blink { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: .35; transform: scale(.72); } }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-weight: 700; font-size: 15px;
  padding: 14px 26px; border-radius: var(--r-pill);
  transition: transform .25s cubic-bezier(.34, 1.56, .64, 1), box-shadow .25s, background .25s, color .25s;
  will-change: transform;
}
.btn:active { transform: scale(.96); }
.btn-signal {
  background: linear-gradient(100deg, var(--signal), #ff7a2e);
  color: #fff; box-shadow: 0 10px 30px rgba(255, 77, 46, .35);
}
.btn-signal:hover { transform: translateY(-2px) scale(1.02); box-shadow: 0 14px 40px rgba(255, 77, 46, .5); }
.btn-ghost {
  background: rgba(242, 244, 250, .06);
  color: var(--ink); box-shadow: inset 0 0 0 1px rgba(242, 244, 250, .22);
}
.btn-ghost:hover { background: rgba(242, 244, 250, .12); transform: translateY(-2px); }
.btn-mint {
  background: linear-gradient(100deg, var(--mint), #2ee6b8);
  color: #04121a; box-shadow: 0 10px 30px rgba(61, 255, 197, .25);
}
.btn-mint:hover { transform: translateY(-2px) scale(1.02); box-shadow: 0 14px 44px rgba(61, 255, 197, .4); }
.btn-sm { padding: 9px 18px; font-size: 13px; }
.btn-lg { padding: 17px 34px; font-size: 17px; }

/* ---------- 头部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  transition: background .3s, box-shadow .3s, border-color .3s;
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(0);
}
.site-header.scrolled {
  background: rgba(7, 11, 23, .82);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
  box-shadow: 0 8px 30px rgba(2, 5, 14, .4);
}
.nav-inner { display: flex; align-items: center; gap: 22px; height: var(--nav-h); }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 900; font-size: 20px; letter-spacing: .02em; }
.brand .brand-badge {
  position: relative; display: grid; place-items: center;
  width: 40px; height: 40px; border-radius: 13px;
  background: linear-gradient(135deg, var(--signal), var(--gold));
  box-shadow: 0 6px 20px rgba(255, 77, 46, .4);
}
.brand .brand-badge svg { width: 22px; height: 22px; }
.brand .brand-badge::after {
  content: ""; position: absolute; inset: -4px; border-radius: 16px;
  border: 1px solid rgba(255, 77, 46, .35); animation: pulse-ring 2.4s ease-out infinite;
}
@keyframes pulse-ring { 0% { transform: scale(.9); opacity: 1; } 100% { transform: scale(1.35); opacity: 0; } }
.brand em { font-style: normal; color: var(--signal); }
.main-nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav-link {
  position: relative; display: block; padding: 10px 15px;
  font-size: 14.5px; font-weight: 600; color: var(--ink-dim);
  border-radius: var(--r-pill); transition: color .25s, background .25s;
}
.nav-link:hover { color: var(--ink); background: rgba(242, 244, 250, .06); }
.nav-link.is-active { color: var(--ink); background: var(--signal-soft); }
.nav-link.is-active::after {
  content: ""; position: absolute; left: 50%; bottom: 2px; transform: translateX(-50%);
  width: 5px; height: 5px; border-radius: 50%; background: var(--signal);
  box-shadow: 0 0 10px var(--signal);
}
.nav-cta { margin-left: 8px; }
.nav-toggle {
  display: none; margin-left: auto;
  width: 44px; height: 44px; border-radius: 12px;
  background: rgba(242, 244, 250, .06); box-shadow: inset 0 0 0 1px var(--line);
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle span { display: block; width: 20px; height: 2.2px; border-radius: 2px; background: var(--ink); transition: transform .3s, opacity .3s; }
body.menu-open .nav-toggle span:nth-child(1) { transform: translateY(7.2px) rotate(45deg); }
body.menu-open .nav-toggle span:nth-child(2) { opacity: 0; }
body.menu-open .nav-toggle span:nth-child(3) { transform: translateY(-7.2px) rotate(-45deg); }
.mobile-panel {
  position: fixed; inset: var(--nav-h) 0 auto 0; z-index: 99;
  background: rgba(7, 11, 23, .97); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  padding: 18px var(--gutter) 26px;
  transform: translateY(-12px); opacity: 0; pointer-events: none;
  transition: transform .3s, opacity .3s;
}
body.menu-open .mobile-panel { transform: translateY(0); opacity: 1; pointer-events: auto; }
.mobile-panel .nav-link { font-size: 17px; padding: 13px 8px; border-radius: var(--r-sm); }
.mobile-panel .nav-cta { margin: 12px 0 0; display: flex; }

/* ---------- Hero 首页 ---------- */
.hero { position: relative; padding: clamp(52px, 9vw, 108px) 0 clamp(40px, 7vw, 84px); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero h1 { margin: 18px 0 20px; }
.hero-lead { font-size: clamp(15px, 2vw, 18px); color: var(--ink-dim); max-width: 34em; }
.hero-lead strong { color: var(--ink); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.hero-tag {
  font-size: 12.5px; font-weight: 600; color: var(--ink-dim);
  padding: 7px 14px; border-radius: var(--r-pill);
  background: rgba(242, 244, 250, .05); box-shadow: inset 0 0 0 1px var(--line);
}
.hero-tag b { color: var(--gold); font-family: var(--font-display); }

/* 雷达扫描仪 */
.radar-wrap { display: flex; justify-content: center; }
.radar {
  position: relative; width: clamp(280px, 32vw, 400px); aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(61, 255, 197, .06) 0%, transparent 55%),
    repeating-radial-gradient(circle, transparent 0 46px, rgba(154, 163, 191, .10) 46px 47px);
  box-shadow:
    inset 0 0 60px rgba(61, 255, 197, .08),
    0 0 0 1px rgba(61, 255, 197, .22),
    0 0 90px rgba(61, 255, 197, .12);
  animation: radar-breathe 3.6s ease-in-out infinite;
}
@keyframes radar-breathe { 0%, 100% { box-shadow: inset 0 0 60px rgba(61,255,197,.08), 0 0 0 1px rgba(61,255,197,.22), 0 0 90px rgba(61,255,197,.12); } 50% { box-shadow: inset 0 0 80px rgba(61,255,197,.14), 0 0 0 1.5px rgba(61,255,197,.4), 0 0 130px rgba(61,255,197,.2); } }
.radar::before, .radar::after {
  content: ""; position: absolute; border-radius: 50%;
  border: 1px dashed rgba(154, 163, 191, .28);
}
.radar::before { inset: 22%; animation: spin-slow 14s linear infinite; }
.radar::after { inset: 36%; border-style: solid; border-color: rgba(255, 77, 46, .16); }
.radar-scan {
  position: absolute; inset: 0; border-radius: 50%; overflow: hidden;
  background: conic-gradient(from 0deg, rgba(255, 77, 46, .5), transparent 22%, transparent);
  animation: spin-slow 3.8s linear infinite;
}
.radar-scan::after {
  content: ""; position: absolute; left: 50%; top: 0; width: 2px; height: 50%;
  background: linear-gradient(var(--signal), transparent); transform-origin: bottom center;
}
@keyframes spin-slow { to { transform: rotate(360deg); } }
.radar-dot {
  position: absolute; width: 8px; height: 8px; border-radius: 50%;
  background: var(--gold); box-shadow: 0 0 14px var(--gold);
  animation: dot-pulse 2.2s ease-in-out infinite;
}
.radar-dot--mint { background: var(--mint); box-shadow: 0 0 14px var(--mint); animation-delay: .7s; }
.radar-dot--pink { background: var(--pink); box-shadow: 0 0 14px var(--pink); animation-delay: 1.3s; }
@keyframes dot-pulse { 0%, 100% { transform: scale(1); opacity: .95; } 50% { transform: scale(1.7); opacity: .5; } }
.radar-core {
  position: absolute; inset: 42%; display: grid; place-items: center;
  border-radius: 50%;
  background: var(--bg-deep);
  box-shadow: 0 0 0 1px rgba(255, 77, 46, .4), 0 0 44px rgba(255, 77, 46, .3);
  overflow: hidden;
}
.radar-core svg { width: 62%; height: 62%; }
.radar-label {
  position: absolute; left: 50%; bottom: -44px; transform: translateX(-50%);
  font-size: 12px; font-weight: 700; letter-spacing: .34em; color: var(--mint); white-space: nowrap;
}
.radar-label::before, .radar-label::after {
  content: ""; display: inline-block; width: 18px; height: 1px; background: rgba(61,255,197,.5); vertical-align: middle; margin: 0 10px;
}

/* ---------- 区块通用 ---------- */
.section { padding: clamp(52px, 8vw, 96px) 0; position: relative; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 32px; flex-wrap: wrap; }
.section-head h2 { margin-top: 10px; font-size: clamp(24px, 3.6vw, 38px); font-family: var(--font-display); font-weight: 900; letter-spacing: .01em; line-height: 1.15; }
.section-head .more { font-size: 14px; font-weight: 600; color: var(--ink-dim); display: inline-flex; align-items: center; gap: 6px; transition: color .25s, gap .25s; }
.section-head .more:hover { color: var(--mint); gap: 10px; }

/* 筛选 Chips */
.chips { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 26px; }
.chip {
  font-size: 13.5px; font-weight: 600; color: var(--ink-dim);
  padding: 9px 18px; border-radius: var(--r-pill);
  background: rgba(242, 244, 250, .05); box-shadow: inset 0 0 0 1px var(--line);
  transition: all .25s;
}
.chip:hover { color: var(--ink); box-shadow: inset 0 0 0 1px rgba(242,244,250,.4); }
.chip.is-on {
  color: #fff; background: linear-gradient(100deg, var(--signal), #ff7a2e);
  box-shadow: 0 6px 22px rgba(255, 77, 46, .35);
}

/* ---------- 榜单卡片 ---------- */
.rank-list { display: grid; gap: 14px; }
.rank-card {
  display: grid; grid-template-columns: 64px 1fr auto; gap: 18px; align-items: center;
  padding: 18px 22px;
  background: linear-gradient(120deg, var(--panel), var(--panel-2));
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card), inset 0 0 0 1px var(--line);
  transition: transform .3s, box-shadow .3s, border-color .3s;
  position: relative; overflow: hidden;
}
.rank-card::before {
  content: ""; position: absolute; inset: 0 auto 0 0; width: 3px;
  background: linear-gradient(var(--signal), var(--gold));
  opacity: 0; transition: opacity .3s;
}
.rank-card:hover { transform: translateY(-3px); box-shadow: var(--glow-signal); }
.rank-card:hover::before { opacity: 1; }
.rank-card.is-top-1 { box-shadow: var(--shadow-card), inset 0 0 0 1px rgba(255, 197, 61, .4); }
.rank-card.is-top-1 .rank-idx { color: var(--gold); }
.rank-num {
  font-family: var(--font-display); font-weight: 900;
  font-size: 30px; color: var(--ink-faint);
  text-align: center; line-height: 1;
}
.rank-idx { transition: color .3s; }
.rank-idx.is-top-1 { color: var(--gold); }
.rank-idx.is-top-2 { color: var(--ink-dim); }
.rank-idx.is-top-3 { color: var(--signal); }
.rank-title { font-size: clamp(15px, 2.2vw, 17px); font-weight: 700; line-height: 1.4; }
.rank-title a:hover { color: var(--signal); }
.rank-meta { margin-top: 5px; display: flex; gap: 12px; font-size: 12px; color: var(--ink-faint); align-items: center; }
.rank-meta .led { width: 6px; height: 6px; }
.rank-tag {
  font-size: 11px; font-weight: 700; letter-spacing: .06em;
  padding: 3px 10px; border-radius: var(--r-pill);
  background: var(--signal-soft); color: var(--signal);
}
.rank-tag--mint { background: rgba(61, 255, 197, .12); color: var(--mint); }
.rank-tag--gold { background: rgba(255, 197, 61, .12); color: var(--gold); }
.rank-right { display: flex; align-items: center; gap: 16px; }
.heat {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--font-display); font-weight: 900; font-size: 17px; color: var(--signal);
  font-variant-numeric: tabular-nums;
}
.heat::before { content: "▲"; font-size: 10px; }
.heat--down { color: var(--mint); }
.heat--down::before { content: "▼"; }

/* 信号热度条 */
.signal { display: flex; gap: 4px; align-items: flex-end; height: 22px; }
.signal i {
  width: 4px; border-radius: 2px;
  background: rgba(154, 163, 191, .22);
  transition: background .4s, box-shadow .4s;
}
.signal i:nth-child(1) { height: 6px; }
.signal i:nth-child(2) { height: 10px; }
.signal i:nth-child(3) { height: 14px; }
.signal i:nth-child(4) { height: 18px; }
.signal i:nth-child(5) { height: 22px; }
.signal[data-level="1"] i:nth-child(1), .signal[data-level="2"] i:nth-child(-n+2), .signal[data-level="3"] i:nth-child(-n+3), .signal[data-level="4"] i:nth-child(-n+4), .signal[data-level="5"] i:nth-child(-n+5) {
  background: linear-gradient(var(--gold), var(--signal));
  box-shadow: 0 0 8px rgba(255, 77, 46, .6);
}

/* ---------- 视频卡片 ---------- */
.video-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.video-grid--3 { grid-template-columns: repeat(3, 1fr); }
.video-card {
  border-radius: var(--r-lg); overflow: hidden;
  background: var(--panel); box-shadow: var(--shadow-card), inset 0 0 0 1px var(--line);
  transition: transform .3s, box-shadow .3s;
  display: flex; flex-direction: column;
}
.video-card:hover { transform: translateY(-5px); box-shadow: var(--glow-mint); }
.video-card[hidden] { display: none; }
.thumb { position: relative; aspect-ratio: 3 / 4; overflow: hidden; }
.video-grid--3 .thumb { aspect-ratio: 16 / 10; }
.thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s cubic-bezier(.2, .8, .2, 1); }
.video-card:hover .thumb img { transform: scale(1.08); }
.thumb::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(4, 7, 15, .78));
}
.play-badge {
  position: absolute; inset: 0; margin: auto; z-index: 2;
  width: 54px; height: 54px; border-radius: 50%;
  background: rgba(7, 11, 23, .55); backdrop-filter: blur(6px);
  box-shadow: 0 0 0 1px rgba(242, 244, 250, .35), 0 8px 30px rgba(2, 5, 14, .5);
  display: grid; place-items: center;
  opacity: 0; transform: scale(.7);
  transition: opacity .3s, transform .3s;
}
.play-badge::before {
  content: ""; width: 0; height: 0; margin-left: 4px;
  border-top: 9px solid transparent; border-bottom: 9px solid transparent; border-left: 14px solid var(--mint);
}
.video-card:hover .play-badge, .video-card:focus-within .play-badge { opacity: 1; transform: scale(1); }
.thumb .dur {
  position: absolute; right: 10px; bottom: 10px; z-index: 2;
  font-size: 11px; font-weight: 700; color: #fff;
  padding: 3px 9px; border-radius: 6px; background: rgba(4, 7, 15, .7);
}
.thumb .hot-tag {
  position: absolute; left: 10px; top: 10px; z-index: 2;
  font-size: 11px; font-weight: 700; color: #fff;
  padding: 4px 10px; border-radius: var(--r-pill);
  background: linear-gradient(100deg, var(--signal), #ff7a2e);
  box-shadow: 0 4px 14px rgba(255, 77, 46, .5);
}
.video-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.video-title { font-size: 15px; font-weight: 700; line-height: 1.42; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-title a:hover { color: var(--signal); }
.video-meta { margin-top: auto; display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--ink-faint); }
.video-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--ink-faint); }
.video-meta .views { font-family: var(--font-display); font-weight: 700; color: var(--ink-dim); }

/* ---------- 话题卡片 ---------- */
.topic-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.topic-card {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  padding: 22px; min-height: 190px;
  background: linear-gradient(150deg, var(--panel-2), var(--panel));
  box-shadow: var(--shadow-card), inset 0 0 0 1px var(--line);
  display: flex; flex-direction: column; justify-content: flex-end; gap: 10px;
  transition: transform .3s, box-shadow .3s;
}
.topic-card:hover { transform: translateY(-5px) rotate(-.6deg); box-shadow: var(--glow-signal); }
.topic-card .topic-emoji {
  position: absolute; right: 14px; top: 10px; font-size: 56px; opacity: .16; transform: rotate(8deg);
}
.topic-card .topic-cat {
  position: absolute; left: 22px; top: 18px;
  font-size: 11px; font-weight: 700; letter-spacing: .12em; color: var(--mint);
  padding: 4px 12px; border-radius: var(--r-pill);
  background: rgba(61, 255, 197, .1);
}
.topic-card h3 { font-size: 17px; font-weight: 800; line-height: 1.4; }
.topic-card h3 a:hover { color: var(--signal); }
.topic-stats { display: flex; gap: 16px; font-size: 12px; color: var(--ink-faint); }
.topic-stats b { font-family: var(--font-display); color: var(--ink-dim); font-weight: 700; }

/* ---------- 特性条 / 统计 ---------- */
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat-card {
  padding: 22px 18px; border-radius: var(--r-md); text-align: center;
  background: rgba(242, 244, 250, .04); box-shadow: inset 0 0 0 1px var(--line);
}
.stat-card .display-num { font-size: clamp(26px, 3.6vw, 38px); color: var(--ink); }
.stat-card .display-num em { font-style: normal; color: var(--signal); font-size: .7em; }
.stat-card p { margin-top: 6px; font-size: 12.5px; color: var(--ink-dim); letter-spacing: .08em; }
.stat-card--signal { background: linear-gradient(150deg, rgba(255, 77, 46, .16), rgba(255, 77, 46, .04)); box-shadow: inset 0 0 0 1px rgba(255, 77, 46, .35); }

/* ---------- 下载 CTA ---------- */
.download-band {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  padding: clamp(34px, 6vw, 60px);
  background:
    radial-gradient(60% 160% at 100% 0%, rgba(255, 77, 46, .28), transparent 55%),
    radial-gradient(50% 140% at 0% 100%, rgba(61, 255, 197, .18), transparent 55%),
    linear-gradient(120deg, var(--panel-2), var(--bg-deep));
  box-shadow: var(--shadow-card), inset 0 0 0 1px var(--line);
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 36px; align-items: center;
}
.download-band h2 { font-size: clamp(26px, 4vw, 42px); font-family: var(--font-display); font-weight: 900; line-height: 1.15; }
.download-band p { margin-top: 12px; color: var(--ink-dim); max-width: 30em; }
.download-actions { display: flex; gap: 12px; margin-top: 26px; flex-wrap: wrap; }
.download-qr {
  justify-self: center; display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.download-qr .qr-box {
  width: 168px; height: 168px; padding: 12px;
  background: #fff; border-radius: 18px;
  box-shadow: 0 12px 40px rgba(2, 5, 14, .6);
}
.download-qr span { font-size: 12.5px; color: var(--ink-dim); letter-spacing: .06em; }
.download-qr span b { color: var(--mint); }

/* ---------- 弹窗 ---------- */
.modal {
  position: fixed; inset: 0; z-index: 200;
  display: grid; place-items: center; padding: var(--gutter);
  visibility: hidden; opacity: 0; transition: opacity .3s, visibility .3s;
}
.modal.is-open { visibility: visible; opacity: 1; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(4, 7, 15, .82); backdrop-filter: blur(10px); }
.modal-box {
  position: relative; width: min(760px, 100%); max-height: 88vh; overflow: auto;
  border-radius: var(--r-lg);
  background: var(--panel); box-shadow: var(--glow-signal), var(--shadow-card);
  transform: translateY(22px) scale(.97); transition: transform .35s cubic-bezier(.34, 1.3, .64, 1);
}
.modal.is-open .modal-box { transform: translateY(0) scale(1); }
.modal-close {
  position: absolute; top: 14px; right: 14px; z-index: 3;
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(4, 7, 15, .6); backdrop-filter: blur(6px);
  display: grid; place-items: center; font-size: 18px; color: #fff;
  box-shadow: inset 0 0 0 1px rgba(242, 244, 250, .25);
  transition: transform .25s, background .25s;
}
.modal-close:hover { transform: rotate(90deg); background: var(--signal); }
.modal-stage { aspect-ratio: 16 / 9; background: var(--bg-deep); position: relative; }
.modal-stage .fake-play {
  position: absolute; inset: 0; display: grid; place-items: center;
  background:
    radial-gradient(80% 100% at 50% 0%, rgba(255, 77, 46, .22), transparent 60%),
    linear-gradient(120deg, #131c38, #04070f);
}
.modal-stage .fake-play .play-ring {
  width: 86px; height: 86px; border-radius: 50%;
  background: linear-gradient(135deg, var(--signal), var(--gold));
  display: grid; place-items: center;
  box-shadow: 0 0 60px rgba(255, 77, 46, .55);
  animation: pulse-ring 2s ease-out infinite;
}
.play-ring::before {
  content: ""; width: 0; height: 0; margin-left: 6px;
  border-top: 16px solid transparent; border-bottom: 16px solid transparent; border-left: 26px solid #fff;
}
.modal-info { padding: 22px 26px 26px; }
.modal-info h3 { font-size: 20px; font-weight: 800; }
.modal-info .modal-meta { margin: 10px 0 16px; display: flex; gap: 14px; font-size: 13px; color: var(--ink-faint); flex-wrap: wrap; }
.modal-info .modal-desc { color: var(--ink-dim); font-size: 14.5px; }
.modal-info .btn { margin-top: 18px; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 54px 0 30px; margin-top: 20px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; }
.footer-brand p { margin-top: 14px; color: var(--ink-faint); font-size: 13.5px; max-width: 26em; }
.footer-col h4 { font-size: 13px; letter-spacing: .2em; color: var(--ink-dim); margin-bottom: 16px; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { font-size: 14px; color: var(--ink-dim); transition: color .25s, padding-left .25s; }
.footer-col a:hover { color: var(--mint); padding-left: 4px; }
.footer-bottom {
  margin-top: 42px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--ink-faint);
}
.socials { display: flex; gap: 10px; }
.socials a {
  width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center;
  background: rgba(242, 244, 250, .06); box-shadow: inset 0 0 0 1px var(--line);
  transition: all .25s;
}
.socials a:hover { background: var(--signal-soft); box-shadow: inset 0 0 0 1px var(--signal); transform: translateY(-2px); }

/* ---------- 回到顶部 ---------- */
#toTop {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 48px; height: 48px; border-radius: 14px;
  background: linear-gradient(135deg, var(--signal), #ff7a2e);
  color: #fff; font-size: 17px;
  box-shadow: 0 10px 30px rgba(255, 77, 46, .4);
  display: grid; place-items: center;
  opacity: 0; transform: translateY(16px) scale(.8); pointer-events: none;
  transition: opacity .3s, transform .3s;
}
#toTop.show { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
#toTop:hover { transform: translateY(-3px); }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s cubic-bezier(.2, .7, .3, 1), transform .7s cubic-bezier(.2, .7, .3, 1); }
.reveal.is-in { opacity: 1; transform: translateY(0); }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }
.reveal[data-delay="5"] { transition-delay: .4s; }

/* ---------- 下载页专用 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  padding: 26px; border-radius: var(--r-lg);
  background: linear-gradient(150deg, var(--panel-2), var(--panel));
  box-shadow: var(--shadow-card), inset 0 0 0 1px var(--line);
  transition: transform .3s, box-shadow .3s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--glow-mint); }
.feature-card .f-icon {
  width: 52px; height: 52px; border-radius: 16px;
  display: grid; place-items: center; margin-bottom: 18px;
  background: var(--signal-soft); box-shadow: inset 0 0 0 1px rgba(255, 77, 46, .3);
  font-size: 24px;
}
.feature-card--mint .f-icon { background: rgba(61, 255, 197, .1); box-shadow: inset 0 0 0 1px rgba(61, 255, 197, .3); }
.feature-card--gold .f-icon { background: rgba(255, 197, 61, .1); box-shadow: inset 0 0 0 1px rgba(255, 197, 61, .3); }
.feature-card h3 { font-size: 17px; font-weight: 800; margin-bottom: 8px; }
.feature-card p { font-size: 13.5px; color: var(--ink-dim); }
.download-hero-phone { display: none; }

.faq-list { display: grid; gap: 12px; max-width: 760px; }
.faq-item { border-radius: var(--r-md); background: var(--panel); box-shadow: inset 0 0 0 1px var(--line); overflow: hidden; }
.faq-item details > summary {
  list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 14px;
  padding: 18px 22px; font-weight: 700; font-size: 15px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; font-size: 22px; color: var(--signal); font-weight: 400;
  transition: transform .3s; flex-shrink: 0;
}
.faq-item details[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-body { padding: 0 22px 18px; color: var(--ink-dim); font-size: 14px; }

/* 播放器页头（video 页） */
.player-banner {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  aspect-ratio: 16 / 8.4; margin-bottom: 34px;
  background:
    radial-gradient(70% 130% at 85% 0%, rgba(255, 77, 46, .3), transparent 60%),
    radial-gradient(60% 120% at 10% 100%, rgba(61, 255, 197, .2), transparent 55%),
    linear-gradient(130deg, #131c38, #04070f);
  box-shadow: var(--shadow-card), inset 0 0 0 1px var(--line);
  display: grid; place-items: center;
}
.player-banner .pb-play {
  width: 92px; height: 92px; border-radius: 50%;
  background: linear-gradient(135deg, var(--signal), var(--gold));
  display: grid; place-items: center; box-shadow: 0 0 70px rgba(255, 77, 46, .55);
  animation: pulse-ring 2.2s ease-out infinite; cursor: pointer;
  transition: transform .3s;
}
.player-banner .pb-play:hover { transform: scale(1.08); }
.pb-play::before {
  content: ""; width: 0; height: 0; margin-left: 8px;
  border-top: 18px solid transparent; border-bottom: 18px solid transparent; border-left: 30px solid #fff;
}
.player-banner .pb-caption {
  position: absolute; left: 24px; bottom: 22px;
  font-size: clamp(16px, 2.4vw, 24px); font-weight: 800; text-shadow: 0 4px 20px rgba(2, 5, 14, .8);
}
.player-banner .pb-sub { position: absolute; left: 24px; bottom: 48px; font-size: 13px; color: var(--ink-dim); }

/* 面包屑 */
.crumbs { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--ink-faint); margin-bottom: 20px; flex-wrap: wrap; }
.crumbs a:hover { color: var(--mint); }
.crumbs .sep { color: var(--ink-faint); opacity: .5; }
.crumbs .here { color: var(--ink-dim); font-weight: 600; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .hero { padding-top: 44px; }
  .radar-wrap { order: -1; }
  .download-band { grid-template-columns: 1fr; }
  .download-qr { justify-self: start; flex-direction: row; }
}
@media (max-width: 560px) {
  .video-grid, .video-grid--3 { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .topic-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .feature-grid { grid-template-columns: 1fr; }
  .rank-card { grid-template-columns: 44px 1fr; padding: 14px 16px; gap: 14px; }
  .rank-right { grid-column: 2; justify-content: flex-start; gap: 12px; }
  .heat { font-size: 15px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .download-qr { flex-direction: column; align-items: center; width: 100%; }
  .hero-actions .btn { flex: 1 1 100%; }
}

/* 尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}