/* ============================================================
   bbi0329-st站 · 设计系统 style.css
   视觉概念：霓虹星光 —— 深空蓝黑底 + 粉橙金霓虹渐变 + 圆润卡片
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --bg: #0b0d1a;
  --bg-soft: #10131f;
  --card: #161a2b;
  --card-2: #1d2236;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);

  --text: #f6f4ef;
  --text-dim: #a9aec6;
  --text-faint: #6d7290;

  --pink: #ff5c8a;
  --orange: #ff8a5c;
  --gold: #ffd166;
  --violet: #7c5cff;
  --sky: #5aa0ff;
  --mint: #37d8b0;

  --grad-main: linear-gradient(135deg, #ff5c8a 0%, #ff8a5c 55%, #ffd166 100%);
  --grad-cool: linear-gradient(135deg, #7c5cff 0%, #5aa0ff 100%);
  --grad-mint: linear-gradient(135deg, #37d8b0 0%, #5aa0ff 100%);
  --grad-text: linear-gradient(120deg, #ffd166 0%, #ff8a5c 45%, #ff5c8a 100%);

  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;

  --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.35);
  --glow-pink: 0 0 26px rgba(255, 92, 138, 0.35);
  --glow-violet: 0 0 26px rgba(124, 92, 255, 0.32);

  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --font-num: "Inter", "DIN Alternate", "Bahnschrift", "Arial Narrow", sans-serif;

  --header-h: 72px;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, select { font-family: inherit; }
:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; border-radius: 4px; }

/* 星空背景装饰 */
.stars {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(1.6px 1.6px at 12% 22%, rgba(255, 255, 255, 0.7), transparent 60%),
    radial-gradient(1.2px 1.2px at 34% 8%, rgba(255, 255, 255, 0.5), transparent 60%),
    radial-gradient(1.8px 1.8px at 58% 32%, rgba(255, 209, 102, 0.6), transparent 60%),
    radial-gradient(1.1px 1.1px at 76% 12%, rgba(255, 255, 255, 0.45), transparent 60%),
    radial-gradient(1.5px 1.5px at 88% 46%, rgba(124, 92, 255, 0.55), transparent 60%),
    radial-gradient(1.3px 1.3px at 24% 68%, rgba(255, 255, 255, 0.4), transparent 60%),
    radial-gradient(1.7px 1.7px at 66% 78%, rgba(90, 160, 255, 0.5), transparent 60%),
    radial-gradient(1.2px 1.2px at 44% 92%, rgba(255, 255, 255, 0.5), transparent 60%);
}

.glow-orb {
  position: fixed;
  z-index: 0;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  pointer-events: none;
}
.glow-orb--pink { width: 480px; height: 480px; top: -140px; right: -120px; background: rgba(255, 92, 138, 0.35); }
.glow-orb--violet { width: 520px; height: 520px; bottom: -180px; left: -160px; background: rgba(124, 92, 255, 0.3); }
.glow-orb--gold { width: 320px; height: 320px; top: 46%; right: -100px; background: rgba(255, 209, 102, 0.18); }

main { position: relative; z-index: 1; }

.container {
  width: min(1200px, 92%);
  margin: 0 auto;
}

/* ---------- 3. 通用区块 ---------- */
.section { padding: 84px 0; position: relative; }
.section--soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--gold);
  text-transform: uppercase;
  padding: 6px 14px;
  border: 1px solid rgba(255, 209, 102, 0.35);
  border-radius: 999px;
  background: rgba(255, 209, 102, 0.08);
  margin-bottom: 16px;
}
.section-tag::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--grad-main);
  box-shadow: var(--glow-pink);
}

.section-title { font-size: clamp(28px, 4.2vw, 42px); font-weight: 800; line-height: 1.25; letter-spacing: -0.5px; }
.section-sub { margin-top: 12px; color: var(--text-dim); font-size: 16px; }

.section-more { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--orange); margin-top: 28px; transition: gap .25s; }
.section-more:hover { gap: 12px; }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  font-weight: 700;
  font-size: 15px;
  border-radius: 999px;
  padding: 13px 26px;
  transition: transform .2s, box-shadow .2s, background .2s;
  white-space: nowrap;
}
.btn:active { transform: scale(.97); }

.btn-primary {
  color: #1a1017;
  background: var(--grad-main);
  box-shadow: var(--glow-pink);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(255, 92, 138, 0.5); }

.btn-ghost {
  color: var(--text);
  border: 1.5px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { border-color: var(--orange); color: var(--orange); transform: translateY(-2px); }

.btn-cool { color: #fff; background: var(--grad-cool); box-shadow: var(--glow-violet); }
.btn-cool:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(124, 92, 255, 0.5); }

.btn-sm { padding: 9px 18px; font-size: 13px; }

.btn svg { width: 17px; height: 17px; flex: none; }

/* ---------- 5. 导航栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(11, 13, 26, 0.72);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.site-header.is-scrolled {
  background: rgba(11, 13, 26, 0.92);
  border-bottom-color: var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); gap: 24px; }

.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; letter-spacing: .3px; }
.brand-mark {
  width: 38px; height: 38px;
  border-radius: 12px;
  background: var(--grad-main);
  display: grid; place-items: center;
  color: #1a1017;
  box-shadow: var(--glow-pink);
}
.brand-mark svg { width: 22px; height: 22px; }
.brand small { display: block; font-size: 10px; font-weight: 600; letter-spacing: 1.6px; color: var(--text-faint); line-height: 1.1; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 9px 15px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-dim);
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--text); background: rgba(255, 255, 255, 0.06); }
.nav-links a.active { color: var(--gold); background: rgba(255, 209, 102, 0.1); }

.nav-cta { display: flex; align-items: center; gap: 12px; }

.nav-toggle { display: none; width: 44px; height: 44px; border-radius: 12px; border: 1px solid var(--line); place-items: center; }
.nav-toggle svg { width: 22px; height: 22px; }

/* 移动端菜单 */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(11, 13, 26, 0.98);
  backdrop-filter: blur(20px);
  padding: calc(var(--header-h) + 24px) 28px 40px;
  display: none;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}
.mobile-menu.is-open { display: flex; }
.mobile-menu a {
  font-size: 19px;
  font-weight: 600;
  padding: 15px 16px;
  border-radius: 14px;
  color: var(--text-dim);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.mobile-menu a.active { color: var(--gold); }
.mobile-menu .btn { margin-top: 22px; }

/* ---------- 6. Hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 64px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(800px 420px at 78% -10%, rgba(124, 92, 255, 0.22), transparent 65%),
    radial-gradient(700px 400px at 12% 108%, rgba(255, 92, 138, 0.16), transparent 65%);
  pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 15px;
  border-radius: 999px;
  background: rgba(255, 92, 138, 0.12);
  border: 1px solid rgba(255, 92, 138, 0.4);
  color: #ffb3c8;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .6px;
  margin-bottom: 22px;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: #37d8b0; box-shadow: 0 0 10px #37d8b0; animation: pulse 1.8s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

.hero-title {
  font-size: clamp(34px, 5.6vw, 62px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -1px;
}
.hero-title .grad { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }

.hero-desc { margin-top: 22px; color: var(--text-dim); font-size: 17px; max-width: 520px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }

.hero-tags { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span {
  font-size: 12.5px;
  color: var(--text-faint);
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px dashed var(--line-strong);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 40px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 16px;
}
.stat b { font-family: var(--font-num); font-size: clamp(22px, 3vw, 30px); font-weight: 800; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { display: block; font-size: 12.5px; color: var(--text-faint); margin-top: 3px; }

/* Hero 右侧视觉 */
.hero-visual { position: relative; }
.hero-phone {
  position: relative;
  border-radius: 34px;
  background: linear-gradient(180deg, #1c2138, #12162a);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transform: rotate(2deg);
  transition: transform .4s;
}
.hero-phone:hover { transform: rotate(0deg) scale(1.015); }
.phone-top { display: flex; align-items: center; gap: 8px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.phone-dot { width: 9px; height: 9px; border-radius: 50%; }
.phone-dot:nth-child(1) { background: #ff5c5c; } .phone-dot:nth-child(2) { background: #ffd166; } .phone-dot:nth-child(3) { background: #37d8b0; }
.phone-body { padding: 18px; display: flex; flex-direction: column; gap: 12px; }
.phone-row { display: flex; gap: 12px; }
.phone-card { flex: 1; border-radius: 14px; background: var(--card-2); border: 1px solid var(--line); padding: 12px; }
.phone-card b { display: block; font-size: 13px; margin-bottom: 8px; }
.phone-chip { height: 8px; border-radius: 4px; margin-bottom: 6px; background: rgba(255, 255, 255, 0.14); }
.phone-chip.warm { background: linear-gradient(90deg, #ff5c8a, #ffd166); width: 78%; }
.phone-chip.cool { background: linear-gradient(90deg, #7c5cff, #5aa0ff); width: 62%; }
.phone-chip.mint { background: linear-gradient(90deg, #37d8b0, #5aa0ff); width: 70%; }
.phone-chip.dim { background: rgba(255, 255, 255, 0.1); }
.phone-live { display: flex; align-items: center; gap: 8px; border-radius: 14px; padding: 12px 14px; background: linear-gradient(120deg, rgba(255, 92, 138, 0.16), rgba(255, 209, 102, 0.12)); border: 1px solid rgba(255, 92, 138, 0.35); font-size: 13px; font-weight: 600; }
.phone-live svg { width: 16px; height: 16px; color: #ff5c8a; flex: none; }

.float-card {
  position: absolute;
  background: var(--card);
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 600;
  animation: floaty 4.5s ease-in-out infinite;
}
.float-card small { display: block; font-size: 11px; font-weight: 400; color: var(--text-faint); }
.float-card .ico { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; color: #1a1017; flex: none; }
.float-card .ico svg { width: 18px; height: 18px; }
.float-card--a { top: 6%; left: -34px; }
.float-card--b { bottom: 10%; right: -20px; animation-delay: 1.6s; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

/* ---------- 7. 亮点卡片 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.feature-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  overflow: hidden;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.feature-card::after {
  content: "";
  position: absolute;
  right: -40px; top: -40px;
  width: 120px; height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 92, 138, 0.16), transparent 70%);
  transition: transform .3s;
}
.feature-card:hover { transform: translateY(-6px); border-color: var(--line-strong); box-shadow: var(--shadow-card); }
.feature-card:hover::after { transform: scale(1.5); }

.feature-ico {
  width: 54px; height: 54px;
  border-radius: 16px;
  display: grid; place-items: center;
  margin-bottom: 20px;
  color: #fff;
}
.feature-ico svg { width: 26px; height: 26px; }
.feature-ico--warm { background: linear-gradient(135deg, #ff5c8a, #ff8a5c); box-shadow: 0 8px 24px rgba(255, 92, 138, .35); }
.feature-ico--cool { background: linear-gradient(135deg, #7c5cff, #5aa0ff); box-shadow: 0 8px 24px rgba(124, 92, 255, .35); }
.feature-ico--mint { background: linear-gradient(135deg, #37d8b0, #5aa0ff); box-shadow: 0 8px 24px rgba(55, 216, 176, .3); }

.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { color: var(--text-dim); font-size: 14px; }

/* ---------- 8. 直播卡片 ---------- */
.live-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

.live-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.live-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card); border-color: var(--line-strong); }

.live-cover { position: relative; aspect-ratio: 16 / 10; overflow: hidden; }
.live-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.live-card:hover .live-cover img { transform: scale(1.08); }

.live-flag {
  position: absolute;
  top: 12px; left: 12px;
  display: flex; align-items: center; gap: 5px;
  font-size: 11px; font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #ff3d5a, #ff8a5c);
  border-radius: 999px;
  padding: 4px 10px;
}
.live-flag svg { width: 11px; height: 11px; }

.live-count {
  position: absolute;
  top: 12px; right: 12px;
  font-size: 11px;
  color: #fff;
  background: rgba(10, 12, 24, 0.62);
  backdrop-filter: blur(6px);
  border-radius: 999px;
  padding: 4px 10px;
  font-family: var(--font-num);
}

.live-info { padding: 16px 16px 18px; }
.live-info h3 { font-size: 15.5px; font-weight: 700; line-height: 1.4; margin-bottom: 6px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; min-height: 2.8em; }
.live-meta { display: flex; align-items: center; gap: 8px; color: var(--text-faint); font-size: 12.5px; }
.live-meta .cat { color: var(--orange); font-weight: 600; }

/* ---------- 9. 榜单 ---------- */
.rank-list { display: flex; flex-direction: column; gap: 12px; }

.rank-item {
  display: flex;
  align-items: center;
  gap: 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: transform .2s, border-color .2s;
  cursor: pointer;
}
.rank-item:hover { transform: translateX(6px); border-color: rgba(255, 138, 92, 0.5); }

.rank-num {
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 800;
  width: 52px;
  text-align: center;
  color: var(--text-faint);
  flex: none;
}
.rank-item:nth-child(1) .rank-num { color: var(--gold); text-shadow: 0 0 18px rgba(255, 209, 102, 0.5); }
.rank-item:nth-child(2) .rank-num { color: #cfd6ea; }
.rank-item:nth-child(3) .rank-num { color: #ff9a5c; }

.rank-main { flex: 1; min-width: 0; }
.rank-main h3 { font-size: 16px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rank-main .rank-tag { font-size: 12px; color: var(--text-faint); margin-top: 4px; display: flex; gap: 8px; flex-wrap: wrap; }
.rank-tag .cat-chip { font-size: 11px; font-weight: 600; padding: 2px 9px; border-radius: 999px; }
.cat-chip--ent { color: #ffb3c8; background: rgba(255, 92, 138, .14); }
.cat-chip--soc { color: #ffd9a0; background: rgba(255, 138, 92, .14); }
.cat-chip--biz { color: #c7b7ff; background: rgba(124, 92, 255, .16); }
.cat-chip--spt { color: #a8d8ff; background: rgba(90, 160, 255, .16); }
.cat-chip--web { color: #a6f2dc; background: rgba(55, 216, 176, .14); }

.rank-heat { width: 130px; flex: none; }
.rank-heat .bar { height: 6px; border-radius: 4px; background: rgba(255, 255, 255, 0.08); overflow: hidden; }
.rank-heat .bar i { display: block; height: 100%; border-radius: 4px; background: var(--grad-main); }
.rank-heat small { display: block; margin-top: 6px; font-size: 11.5px; color: var(--text-faint); font-family: var(--font-num); text-align: right; }

.rank-arrow { color: var(--text-faint); flex: none; display: grid; place-items: center; }
.rank-arrow svg { width: 18px; height: 18px; }

/* 筛选隐藏态（由 main.js 控制） */
.is-hidden { display: none !important; }

/* 筛选 chips */
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.chip {
  padding: 9px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dim);
  background: var(--card);
  border: 1px solid var(--line);
  transition: all .2s;
}
.chip:hover { color: var(--text); border-color: var(--line-strong); }
.chip.is-active {
  color: #1a1017;
  background: var(--grad-main);
  border-color: transparent;
  box-shadow: var(--glow-pink);
}

/* ---------- 10. 视频卡片 ---------- */
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }

.video-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card); border-color: var(--line-strong); }

.video-cover { position: relative; aspect-ratio: 4 / 3; overflow: hidden; }
.video-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.video-card:hover .video-cover img { transform: scale(1.07); }

.video-play {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(11, 13, 26, 0.25);
  transition: background .25s;
}
.video-play .ring {
  width: 54px; height: 54px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  color: #1a1017;
  display: grid; place-items: center;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  transition: transform .25s;
}
.video-play .ring svg { width: 22px; height: 22px; margin-left: 3px; }
.video-card:hover .video-play { background: rgba(11, 13, 26, 0.1); }
.video-card:hover .video-play .ring { transform: scale(1.14); }

.video-dur {
  position: absolute;
  right: 10px; bottom: 10px;
  font-size: 11px;
  color: #fff;
  background: rgba(10, 12, 24, 0.68);
  border-radius: 8px;
  padding: 3px 8px;
  font-family: var(--font-num);
}

.video-info { padding: 15px 16px 17px; }
.video-info h3 { font-size: 15px; font-weight: 700; line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; min-height: 2.9em; }
.video-meta { display: flex; align-items: center; gap: 10px; margin-top: 9px; color: var(--text-faint); font-size: 12px; flex-wrap: wrap; }
.video-meta .cat { color: var(--orange); font-weight: 600; }

/* 话题墙 */
.topic-cloud { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; max-width: 860px; margin: 0 auto; }
.topic {
  padding: 11px 22px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--line);
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-dim);
  transition: all .22s;
}
.topic:hover { color: #1a1017; background: var(--grad-main); border-color: transparent; transform: translateY(-3px); box-shadow: var(--glow-pink); }
.topic small { font-weight: 400; margin-left: 4px; opacity: .7; font-family: var(--font-num); }

/* ---------- 11. 下载横幅 / 下载页 ---------- */
.download-banner {
  position: relative;
  border-radius: var(--radius-lg);
  padding: 54px 48px;
  overflow: hidden;
  background: linear-gradient(120deg, rgba(124, 92, 255, 0.22), rgba(255, 92, 138, 0.18) 60%, rgba(255, 209, 102, 0.14));
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.download-banner h2 { font-size: clamp(24px, 3.4vw, 34px); font-weight: 800; line-height: 1.3; }
.download-banner p { color: var(--text-dim); margin-top: 10px; max-width: 460px; font-size: 15px; }
.download-banner .btn { margin-top: 24px; }

.qr-box {
  width: 150px; height: 150px;
  padding: 12px;
  background: #fff;
  border-radius: 18px;
  display: grid;
  place-items: center;
  flex: none;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}
.qr-grid { display: grid; grid-template-columns: repeat(9, 1fr); gap: 3px; width: 100%; }
.qr-grid i { aspect-ratio: 1; border-radius: 2px; background: #1b1b2f; }
.qr-grid i.blank { background: transparent; }

.store-btns { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 26px; }
.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: #11141f;
  border: 1.5px solid var(--line-strong);
  border-radius: 16px;
  padding: 12px 22px;
  transition: border-color .2s, transform .2s, box-shadow .2s;
}
.store-btn:hover { border-color: var(--orange); transform: translateY(-2px); box-shadow: 0 10px 26px rgba(255, 92, 138, 0.18); }
.store-btn svg { width: 26px; height: 26px; flex: none; }
.store-btn b { display: block; font-size: 15px; line-height: 1.2; }
.store-btn small { display: block; font-size: 10.5px; color: var(--text-faint); letter-spacing: .4px; }

/* 步骤 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  position: relative;
}
.step-num {
  font-family: var(--font-num);
  font-size: 44px;
  font-weight: 800;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  margin-bottom: 16px;
}
.step h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.step p { color: var(--text-dim); font-size: 14px; }

/* FAQ */
.faq { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-md); overflow: hidden; }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  font-size: 15.5px;
  font-weight: 700;
  text-align: left;
}
.faq-q svg { width: 18px; height: 18px; color: var(--orange); flex: none; transition: transform .25s; }
.faq-item.is-open .faq-q svg { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s; }
.faq-a p { padding: 0 22px 20px; color: var(--text-dim); font-size: 14.5px; }
.faq-item.is-open .faq-a { max-height: 300px; }

/* ---------- 12. 关于页 ---------- */
.about-lead { max-width: 780px; margin: 0 auto 60px; text-align: center; }
.about-lead h2 { font-size: clamp(26px, 3.6vw, 38px); font-weight: 800; margin-bottom: 20px; }
.about-lead p { color: var(--text-dim); font-size: 16px; }

.mission-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.mission {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
}
.mission .ico { width: 48px; height: 48px; margin: 0 auto 14px; border-radius: 14px; display: grid; place-items: center; color: #fff; }
.mission .ico svg { width: 24px; height: 24px; }
.mission b { display: block; font-size: 15.5px; margin-bottom: 6px; }
.mission p { color: var(--text-faint); font-size: 12.5px; line-height: 1.6; }

.timeline { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 0; position: relative; }
.timeline::before { content: ""; position: absolute; left: 17px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(180deg, #ff5c8a, #7c5cff); border-radius: 2px; }
.tl-item { position: relative; padding: 0 0 30px 52px; }
.tl-item::before { content: ""; position: absolute; left: 11px; top: 6px; width: 14px; height: 14px; border-radius: 50%; background: var(--bg); border: 3px solid var(--orange); }
.tl-item b { display: block; font-size: 15.5px; margin-bottom: 4px; }
.tl-item span { color: var(--text-faint); font-size: 12.5px; font-family: var(--font-num); }
.tl-item p { color: var(--text-dim); font-size: 14px; margin-top: 6px; }

/* ---------- 13. 页脚 ---------- */
.site-footer { position: relative; z-index: 1; border-top: 1px solid var(--line); background: var(--bg-soft); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 44px; }
.footer-brand p { color: var(--text-faint); font-size: 13.5px; margin-top: 14px; max-width: 300px; }
.footer-col h4 { font-size: 13px; letter-spacing: 2px; color: var(--gold); text-transform: uppercase; margin-bottom: 18px; }
.footer-col a { display: block; color: var(--text-dim); font-size: 14px; padding: 5px 0; transition: color .2s, padding-left .2s; }
.footer-col a:hover { color: var(--text); padding-left: 5px; }
.footer-bottom { border-top: 1px solid var(--line); padding: 20px 0; display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; color: var(--text-faint); font-size: 12.5px; }

/* ---------- 14. 弹窗 ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: grid;
  place-items: center;
  padding: 24px;
  visibility: hidden;
  opacity: 0;
  transition: opacity .25s, visibility .25s;
}
.modal.is-open { visibility: visible; opacity: 1; }
.modal-mask { position: absolute; inset: 0; background: rgba(6, 8, 16, 0.82); backdrop-filter: blur(8px); }
.modal-box {
  position: relative;
  width: min(760px, 100%);
  background: var(--card);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-card);
  transform: translateY(18px) scale(.98);
  transition: transform .28s;
}
.modal.is-open .modal-box { transform: translateY(0) scale(1); }
.modal-close { position: absolute; top: 14px; right: 14px; width: 38px; height: 38px; border-radius: 50%; background: rgba(255, 255, 255, 0.07); display: grid; place-items: center; color: var(--text-dim); z-index: 2; }
.modal-close:hover { color: #fff; background: rgba(255, 92, 138, 0.25); }
.modal-close svg { width: 18px; height: 18px; }
.modal-player { position: relative; aspect-ratio: 16 / 9; border-radius: var(--radius-md); overflow: hidden; background: #06070f; display: grid; place-items: center; }
.modal-player img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .55; }
.modal-player .play-big {
  position: relative;
  width: 72px; height: 72px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  color: #1a1017;
  display: grid; place-items: center;
  cursor: pointer;
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.45);
}
.modal-player .play-big svg { width: 28px; height: 28px; margin-left: 4px; }
.modal-title { margin-top: 18px; font-size: 19px; font-weight: 700; line-height: 1.5; }
.modal-sub { margin-top: 8px; color: var(--text-dim); font-size: 14px; }

/* ---------- 15. 回到顶部 ---------- */
.to-top {
  position: fixed;
  right: 22px; bottom: 26px;
  z-index: 200;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--grad-main);
  color: #1a1017;
  display: grid;
  place-items: center;
  box-shadow: var(--glow-pink);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity .25s, transform .25s, visibility .25s;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top svg { width: 20px; height: 20px; }

/* ---------- 16. 滚动显现动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .float-card, .hero-phone { animation: none; }
  html { scroll-behavior: auto; }
}

/* 无 JS 兜底 */
.no-js .reveal { opacity: 1; transform: none; }

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1080px) {
  .feature-grid, .steps { grid-template-columns: repeat(2, 1fr); }
  .live-grid { grid-template-columns: repeat(3, 1fr); }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .mission-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-visual { max-width: 420px; margin: 0 auto; }
}

@media (max-width: 820px) {
  .section { padding: 64px 0; }
  .nav-links, .nav-cta .btn { display: none; }
  .nav-toggle { display: grid; }
  .live-grid { grid-template-columns: repeat(2, 1fr); }
  .rank-heat { width: 90px; }
  .float-card--a { left: -6px; }
  .float-card--b { right: -6px; }
  .download-banner { padding: 40px 26px; flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .feature-grid, .steps, .video-grid, .mission-grid { grid-template-columns: 1fr; }
  .live-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); gap: 10px; }
  .stat { padding: 14px 10px; }
  .rank-item { padding: 13px 14px; gap: 12px; }
  .rank-num { font-size: 24px; width: 40px; }
  .rank-heat { width: 68px; }
  .hero-actions .btn { flex: 1; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .store-btns .store-btn { flex: 1 1 100%; justify-content: center; }
}