/* ============================================================
   1024xp视频社区 · 星轨播放器 设计系统
   概念：深空紫黑底 + 紫粉橙霓虹渐变
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 背景层 */
  --bg-deep: #0B0A1A;
  --bg-base: #11102A;
  --bg-elevated: #181638;
  --bg-card: rgba(255, 255, 255, 0.035);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --bg-glass: rgba(20, 18, 45, 0.65);

  /* 文字 */
  --text-primary: #F5F3FF;
  --text-secondary: #B8B5D0;
  --text-muted: #7A7896;
  --text-on-gradient: #FFFFFF;

  /* 主题色 */
  --brand-violet: #8B5CF6;
  --brand-pink: #EC4899;
  --brand-orange: #FB923C;
  --brand-cyan: #22D3EE;
  --brand-green: #4ADE80;

  /* 渐变 */
  --grad-hero: linear-gradient(135deg, #8B5CF6 0%, #EC4899 50%, #FB923C 100%);
  --grad-cool: linear-gradient(135deg, #8B5CF6 0%, #22D3EE 100%);
  --grad-warm: linear-gradient(135deg, #EC4899 0%, #FB923C 100%);
  --grad-text: linear-gradient(120deg, #C4B5FD 0%, #F9A8D4 45%, #FDBA74 100%);
  --grad-soft: linear-gradient(135deg, rgba(139,92,246,.15), rgba(236,72,153,.12), rgba(251,146,60,.1));

  /* 边框 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --border-glow: rgba(139, 92, 246, 0.4);

  /* 圆角 */
  --radius-xs: 8px;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 999px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-glow-violet: 0 8px 40px rgba(139, 92, 246, 0.35);
  --shadow-glow-pink: 0 8px 40px rgba(236, 72, 153, 0.3);
  --shadow-glow-orange: 0 8px 40px rgba(251, 146, 60, 0.25);

  /* 字体 */
  --font-display: 'Space Grotesk', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;

  /* 间距与过渡 */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition: 0.35s var(--ease);

  /* 容器 */
  --container: 1200px;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
  min-height: 100vh;
}

/* 全局深空背景：多层径向光晕 + 星点 */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 15% 0%, rgba(139, 92, 246, 0.18), transparent 60%),
    radial-gradient(ellipse 60% 50% at 85% 10%, rgba(236, 72, 153, 0.14), transparent 55%),
    radial-gradient(ellipse 70% 60% at 50% 100%, rgba(251, 146, 60, 0.1), transparent 60%),
    var(--bg-deep);
  z-index: -2;
  pointer-events: none;
}
body::after {
  content: '';
  position: fixed; inset: 0;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,.6), transparent),
    radial-gradient(1px 1px at 70% 60%, rgba(255,255,255,.5), transparent),
    radial-gradient(1px 1px at 40% 80%, rgba(255,255,255,.4), transparent),
    radial-gradient(2px 2px at 85% 25%, rgba(255,255,255,.3), transparent),
    radial-gradient(1px 1px at 10% 70%, rgba(255,255,255,.5), transparent),
    radial-gradient(1px 1px at 55% 15%, rgba(255,255,255,.4), transparent),
    radial-gradient(1.5px 1.5px at 90% 85%, rgba(255,255,255,.3), transparent),
    radial-gradient(1px 1px at 30% 50%, rgba(255,255,255,.4), transparent);
  background-size: 100% 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.7;
  animation: twinkle 6s ease-in-out infinite alternate;
}
@keyframes twinkle { from { opacity: 0.4; } to { opacity: 0.8; } }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; }

/* ---------- 排版工具 ---------- */
.gradient-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.font-display { font-family: var(--font-display); }

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 96px 0; position: relative; }
.section-sm { padding: 64px 0; }

/* ---------- 区段标题 ---------- */
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display);
  font-size: 13px; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--brand-pink);
  background: rgba(236, 72, 153, 0.1);
  border: 1px solid rgba(236, 72, 153, 0.25);
  padding: 6px 14px; border-radius: var(--radius-pill);
  margin-bottom: 20px;
}
.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700; line-height: 1.2; letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.section-head p {
  color: var(--text-secondary); font-size: 17px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-family: var(--font-display);
  font-weight: 600; font-size: 15px;
  padding: 14px 28px; border-radius: var(--radius-pill);
  transition: all var(--transition);
  white-space: nowrap; position: relative;
  border: none; cursor: pointer;
}
.btn svg { width: 18px; height: 18px; flex-shrink: 0; }

.btn-primary {
  background: var(--grad-hero);
  color: var(--text-on-gradient);
  box-shadow: var(--shadow-glow-violet), inset 0 1px 0 rgba(255,255,255,.2);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-pink), var(--shadow-glow-orange), inset 0 1px 0 rgba(255,255,255,.25);
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(10px);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--brand-violet);
  transform: translateY(-2px);
}
.btn-ghost {
  background: transparent; color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}
.btn-ghost:hover { color: var(--text-primary); border-color: var(--brand-pink); }
.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-lg { padding: 18px 40px; font-size: 17px; }
.btn-block { width: 100%; }

/* ---------- 徽章 ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 600;
  padding: 4px 12px; border-radius: var(--radius-pill);
  background: rgba(255,255,255,.06);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}
.badge-live { background: rgba(74,222,128,.12); border-color: rgba(74,222,128,.3); color: var(--brand-green); }
.badge-hot { background: rgba(236,72,153,.12); border-color: rgba(236,72,153,.3); color: var(--brand-pink); }
.badge-new { background: rgba(34,211,238,.12); border-color: rgba(34,211,238,.3); color: var(--brand-cyan); }
.badge-ai { background: rgba(139,92,246,.15); border-color: rgba(139,92,246,.35); color: #C4B5FD; }
.badge-dot::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; box-shadow: 0 0 8px currentColor;
}

/* ---------- 导航栏 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: all var(--transition);
  padding: 18px 0;
}
.nav.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 0;
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 32px;
}
.nav-logo {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--font-display);
  font-weight: 700; font-size: 20px;
  letter-spacing: -0.01em;
}
.logo-mark {
  width: 42px; height: 42px;
  border-radius: 13px;
  background: var(--grad-hero);
  display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 800; font-size: 16px;
  color: #fff;
  box-shadow: var(--shadow-glow-violet);
  position: relative; overflow: hidden;
  flex-shrink: 0;
}
.logo-mark::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.3), transparent 50%);
  border-radius: inherit;
}
.nav-links {
  display: flex; align-items: center; gap: 6px;
}
.nav-link {
  font-size: 15px; font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 16px; border-radius: var(--radius-pill);
  transition: all var(--transition);
  position: relative;
}
.nav-link:hover { color: var(--text-primary); background: rgba(255,255,255,.05); }
.nav-link.active { color: var(--text-primary); background: rgba(255,255,255,.08); }
.nav-link.active::after {
  content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--brand-pink);
  box-shadow: 0 0 8px var(--brand-pink);
}
.nav-actions { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none; width: 44px; height: 44px;
  border-radius: 12px;
  background: rgba(255,255,255,.06);
  border: 1px solid var(--border-subtle);
  align-items: center; justify-content: center;
  flex-direction: column; gap: 5px;
}
.nav-toggle span {
  width: 20px; height: 2px; background: var(--text-primary);
  border-radius: 2px; transition: all var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 180px 0 120px;
  overflow: hidden;
}
.hero-grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr;
  gap: 60px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-strong);
  padding: 8px 16px; border-radius: var(--radius-pill);
  font-size: 13px; color: var(--text-secondary);
  margin-bottom: 28px;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--brand-green); box-shadow: 0 0 10px var(--brand-green); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 6vw, 68px);
  font-weight: 700; line-height: 1.08; letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.hero h1 .line { display: block; }
.hero-sub {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-secondary);
  max-width: 540px; margin-bottom: 36px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 40px; }
.hero-stats {
  display: flex; flex-wrap: wrap; gap: 36px;
  padding-top: 32px; border-top: 1px solid var(--border-subtle);
}
.hero-stat .num {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 36px); font-weight: 700;
  line-height: 1;
}
.hero-stat .label { font-size: 13px; color: var(--text-muted); margin-top: 6px; }

/* Hero 视觉卡 */
.hero-visual { position: relative; }
.orbit {
  position: relative;
  width: 100%; aspect-ratio: 1;
  max-width: 460px; margin: 0 auto;
}
.orbit-core {
  position: absolute; inset: 30%;
  border-radius: 50%;
  background: var(--grad-hero);
  box-shadow: var(--shadow-glow-violet), var(--shadow-glow-pink);
  display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 800; font-size: 32px;
  color: #fff;
  animation: float 4s ease-in-out infinite;
}
.orbit-core::before {
  content: ''; position: absolute; inset: -8px;
  border-radius: 50%; border: 2px solid rgba(255,255,255,.2);
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
.orbit-ring {
  position: absolute; border-radius: 50%;
  border: 1px dashed rgba(255,255,255,.15);
}
.orbit-ring.r1 { inset: 0; animation: spin 30s linear infinite; }
.orbit-ring.r2 { inset: 12%; animation: spin 22s linear infinite reverse; }
.orbit-ring.r3 { inset: 24%; animation: spin 18s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.orbit-node {
  position: absolute; width: 52px; height: 52px;
  border-radius: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  display: grid; place-items: center;
  font-size: 22px;
  box-shadow: var(--shadow-md);
  top: 50%; left: 50%;
  margin: -26px;
}
.orbit-node.n1 { transform: translate(210px, -80px); animation: spin 30s linear infinite; }
.orbit-node.n2 { transform: translate(-190px, 110px); animation: spin 22s linear infinite reverse; }
.orbit-node.n3 { transform: translate(80px, 195px); animation: spin 18s linear infinite; }
.orbit-node::before {
  content: ''; position: absolute; inset: -4px;
  border-radius: 18px;
  background: var(--grad-cool);
  opacity: 0; z-index: -1;
  transition: opacity var(--transition);
}
.orbit-node:hover::before { opacity: 0.6; }

/* ---------- 卡片通用 ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.card-glow::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--grad-hero);
  opacity: 0; transition: opacity var(--transition);
}
.card-glow:hover::before { opacity: 1; }

/* ---------- 特性卡片 ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  display: grid; place-items: center;
  font-size: 26px;
  margin-bottom: 22px;
  background: var(--grad-soft);
  border: 1px solid var(--border-subtle);
}
.card h3 {
  font-family: var(--font-display);
  font-size: 20px; font-weight: 600;
  margin-bottom: 12px; letter-spacing: -0.01em;
}
.card p { color: var(--text-secondary); font-size: 15px; }

/* ---------- 视频卡片 ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.video-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg), var(--shadow-glow-violet);
}
.video-thumb {
  position: relative; aspect-ratio: 16/9;
  background: var(--bg-elevated);
  display: grid; place-items: center;
  overflow: hidden;
}
.video-thumb .thumb-grad {
  position: absolute; inset: 0;
  background: var(--grad-cool);
  opacity: 0.85;
}
.video-thumb .thumb-grad.warm { background: var(--grad-warm); }
.video-thumb .thumb-grad.hero { background: var(--grad-hero); }
.video-thumb .thumb-emoji { position: relative; font-size: 48px; filter: drop-shadow(0 4px 12px rgba(0,0,0,.4)); }
.video-thumb .play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 56px; height: 56px; border-radius: 50%;
  background: rgba(0,0,0,.5); backdrop-filter: blur(8px);
  border: 2px solid rgba(255,255,255,.3);
  display: grid; place-items: center;
  font-size: 22px; color: #fff;
  opacity: 0; transition: all var(--transition);
}
.video-card:hover .play-btn { opacity: 1; transform: translate(-50%,-50%) scale(1.1); }
.video-thumb .duration {
  position: absolute; bottom: 10px; right: 10px;
  background: rgba(0,0,0,.7); backdrop-filter: blur(4px);
  padding: 3px 8px; border-radius: 6px; font-size: 12px; font-weight: 600;
}
.video-thumb .thumb-badge {
  position: absolute; top: 10px; left: 10px;
}
.video-info { padding: 16px 18px; }
.video-title {
  font-family: var(--font-display);
  font-size: 15px; font-weight: 600; line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.video-meta { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--text-muted); }
.video-meta .author { display: flex; align-items: center; gap: 6px; }
.video-meta .avatar {
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--grad-warm); display: grid; place-items: center;
  font-size: 11px; color: #fff; font-weight: 600;
}

/* ---------- 短视频瀑布流 ---------- */
.short-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.short-card {
  border-radius: var(--radius-lg);
  overflow: hidden; position: relative;
  aspect-ratio: 9/16;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition);
  cursor: pointer;
}
.short-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.short-card .thumb-grad { position: absolute; inset: 0; }
.short-card .thumb-emoji { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); font-size: 56px; filter: drop-shadow(0 4px 16px rgba(0,0,0,.4)); }
.short-overlay {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 16px;
  background: linear-gradient(to top, rgba(0,0,0,.85), transparent);
}
.short-title { font-family: var(--font-display); font-weight: 600; font-size: 15px; line-height: 1.3; margin-bottom: 8px; }
.short-stats { display: flex; align-items: center; gap: 14px; font-size: 13px; color: rgba(255,255,255,.85); }
.short-stats span { display: flex; align-items: center; gap: 4px; }

/* ---------- 数据条 ---------- */
.stats-bar {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 48px;
  border-radius: var(--radius-xl);
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
}
.stat-item { text-align: center; }
.stat-item .stat-num {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px); font-weight: 700;
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-item .stat-label { color: var(--text-secondary); font-size: 14px; margin-top: 8px; }

/* ---------- 步骤/指南 ---------- */
.steps {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px; counter-reset: step;
}
.step-card {
  position: relative; padding: 32px 28px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition);
}
.step-card:hover { border-color: var(--brand-violet); transform: translateY(-4px); }
.step-num {
  font-family: var(--font-display);
  font-size: 48px; font-weight: 800;
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  line-height: 1; margin-bottom: 20px;
}
.step-card h3 { font-family: var(--font-display); font-size: 18px; margin-bottom: 10px; }
.step-card p { color: var(--text-secondary); font-size: 14px; }

/* ---------- CTA ---------- */
.cta-band {
  position: relative;
  border-radius: var(--radius-xl);
  padding: 64px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-strong);
  overflow: hidden;
  text-align: center;
}
.cta-band::before {
  content: ''; position: absolute; inset: 0;
  background: var(--grad-soft);
  z-index: 0;
}
.cta-band > * { position: relative; z-index: 1; }
.cta-band h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px); font-weight: 700;
  margin-bottom: 16px; letter-spacing: -0.02em;
}
.cta-band p { color: var(--text-secondary); font-size: 17px; max-width: 540px; margin: 0 auto 32px; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 32px;
  margin-top: 64px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 40px; margin-bottom: 48px;
}
.footer-brand p { color: var(--text-secondary); font-size: 14px; margin-top: 16px; max-width: 280px; }
.footer-social { display: flex; gap: 10px; margin-top: 20px; }
.footer-social a {
  width: 40px; height: 40px; border-radius: 12px;
  background: var(--bg-card); border: 1px solid var(--border-subtle);
  display: grid; place-items: center; font-size: 18px;
  transition: all var(--transition);
}
.footer-social a:hover { background: var(--grad-hero); border-color: transparent; transform: translateY(-2px); }
.footer-col h4 {
  font-family: var(--font-display); font-size: 14px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--text-muted); margin-bottom: 18px;
}
.footer-col li { margin-bottom: 12px; }
.footer-col a { color: var(--text-secondary); font-size: 14px; transition: color var(--transition); }
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 28px; border-top: 1px solid var(--border-subtle);
  font-size: 13px; color: var(--text-muted);
}
.footer-bottom .links { display: flex; gap: 20px; }
.footer-bottom a:hover { color: var(--text-primary); }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed; bottom: 28px; right: 28px;
  width: 50px; height: 50px; border-radius: 14px;
  background: var(--grad-hero);
  display: grid; place-items: center;
  font-size: 22px; color: #fff;
  box-shadow: var(--shadow-glow-violet);
  opacity: 0; visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 900;
  border: none; cursor: pointer;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { transform: translateY(-4px); }

/* ---------- 移动端菜单遮罩 ---------- */
.mobile-menu {
  position: fixed; inset: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(24px);
  z-index: 999;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 8px;
  opacity: 0; visibility: hidden;
  transition: all var(--transition);
}
.mobile-menu.open { opacity: 1; visibility: visible; }
.mobile-menu a {
  font-family: var(--font-display);
  font-size: 26px; font-weight: 600;
  padding: 14px 28px;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.mobile-menu a:hover, .mobile-menu a.active { color: var(--text-primary); }

/* ---------- 弹窗 ---------- */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(5, 4, 15, 0.8);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: none; align-items: center; justify-content: center;
  padding: 24px;
}
.modal-overlay.open { display: flex; animation: fadeIn 0.25s var(--ease); }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  padding: 40px;
  max-width: 440px; width: 100%;
  text-align: center;
  animation: modalUp 0.3s var(--ease-bounce);
  position: relative;
}
@keyframes modalUp { from { transform: translateY(30px) scale(.96); opacity: 0; } to { transform: translateY(0) scale(1); opacity: 1; } }
.modal-close {
  position: absolute; top: 16px; right: 16px;
  width: 36px; height: 36px; border-radius: 10px;
  background: rgba(255,255,255,.06); border: 1px solid var(--border-subtle);
  display: grid; place-items: center; font-size: 18px; color: var(--text-secondary);
  transition: all var(--transition);
}
.modal-close:hover { background: rgba(255,255,255,.12); color: var(--text-primary); }
.modal-icon {
  width: 72px; height: 72px; border-radius: 20px;
  background: var(--grad-soft); border: 1px solid var(--border-subtle);
  display: grid; place-items: center; font-size: 34px;
  margin: 0 auto 24px;
}
.modal h3 { font-family: var(--font-display); font-size: 22px; margin-bottom: 10px; }
.modal p { color: var(--text-secondary); margin-bottom: 24px; }

/* ---------- 滚动显现动画 ---------- */
.reveal {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal[data-delay="1"] { transition-delay: 0.1s; }
.reveal[data-delay="2"] { transition-delay: 0.2s; }
.reveal[data-delay="3"] { transition-delay: 0.3s; }
.reveal[data-delay="4"] { transition-delay: 0.4s; }
.reveal[data-delay="5"] { transition-delay: 0.5s; }

/* ---------- 页面通用头部 ---------- */
.page-hero {
  position: relative;
  padding: 160px 0 64px;
  text-align: center;
}
.page-hero .container { max-width: 760px; }
.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 700; line-height: 1.1; letter-spacing: -0.03em;
  margin-bottom: 20px;
}
.page-hero p { color: var(--text-secondary); font-size: 17px; max-width: 580px; margin: 0 auto; }

/* ---------- 筛选 Chips ---------- */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin-bottom: 40px;
  justify-content: center;
}
.chip {
  padding: 9px 20px; border-radius: var(--radius-pill);
  background: var(--bg-card); border: 1px solid var(--border-subtle);
  font-size: 14px; font-weight: 500; color: var(--text-secondary);
  transition: all var(--transition); cursor: pointer;
}
.chip:hover { color: var(--text-primary); border-color: var(--border-strong); }
.chip.active {
  background: var(--grad-hero); color: #fff; border-color: transparent;
  box-shadow: var(--shadow-glow-violet);
}

/* ---------- App下载区 ---------- */
.download-hero {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 60px; align-items: center;
}
.download-visual {
  position: relative; aspect-ratio: 1;
  max-width: 420px; margin: 0 auto;
}
.phone-frame {
  position: absolute; inset: 20% 30%;
  border-radius: 36px;
  background: var(--bg-elevated);
  border: 3px solid var(--border-strong);
  padding: 20px;
  box-shadow: var(--shadow-lg), var(--shadow-glow-violet);
  display: flex; flex-direction: column; align-items: center;
}
.phone-screen {
  width: 100%; flex: 1;
  border-radius: 22px;
  background: var(--grad-cool);
  display: grid; place-items: center;
  font-size: 60px;
}
.qr-card {
  position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  background: var(--bg-glass); backdrop-filter: blur(12px);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 14px; text-align: center;
  box-shadow: var(--shadow-md);
}
.qr-card .qr-box {
  width: 70px; height: 70px; background: #fff; border-radius: 10px;
  display: grid; place-items: center; margin: 0 auto 8px;
  font-size: 30px;
}
.qr-card .qr-label { font-size: 11px; color: var(--text-secondary); }

/* ---------- 平台徽章 ---------- */
.platforms { display: flex; flex-wrap: wrap; gap: 16px; }
.platform {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 24px; border-radius: var(--radius-md);
  background: var(--bg-card); border: 1px solid var(--border-subtle);
  transition: all var(--transition);
}
.platform:hover { border-color: var(--brand-violet); transform: translateY(-2px); }
.platform .ico { font-size: 32px; }
.platform .info .name { font-family: var(--font-display); font-weight: 600; font-size: 15px; }
.platform .info .size { font-size: 12px; color: var(--text-muted); }

/* ---------- 指南卡片 ---------- */
.guide-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.guide-card {
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--bg-card); border: 1px solid var(--border-subtle);
  transition: all var(--transition);
}
.guide-card:hover { border-color: var(--brand-pink); transform: translateY(-4px); }
.guide-card .guide-icon { font-size: 40px; margin-bottom: 18px; }
.guide-card h3 { font-family: var(--font-display); font-size: 19px; margin-bottom: 12px; }
.guide-card p { color: var(--text-secondary); font-size: 15px; margin-bottom: 16px; }
.guide-link { display: inline-flex; align-items: center; gap: 6px; color: var(--brand-pink); font-weight: 600; font-size: 14px; }
.guide-link:hover { gap: 10px; }

/* ---------- 视频播放器模拟 ---------- */
.player {
  position: relative; aspect-ratio: 16/9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-deep);
  border: 1px solid var(--border-subtle);
}
.player .player-bg { position: absolute; inset: 0; background: var(--grad-hero); opacity: 0.5; }
.player .player-emoji { position: relative; top: 50%; left: 50%; transform: translate(-50%,-50%); font-size: 80px; filter: drop-shadow(0 8px 24px rgba(0,0,0,.5)); }
.player .big-play {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 88px; height: 88px; border-radius: 50%;
  background: rgba(0,0,0,.5); backdrop-filter: blur(8px);
  border: 3px solid rgba(255,255,255,.4);
  display: grid; place-items: center; font-size: 36px; color: #fff;
  transition: all var(--transition); cursor: pointer;
}
.player .big-play:hover { transform: translate(-50%,-50%) scale(1.1); background: rgba(0,0,0,.7); }
.player-controls {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 20px;
  background: linear-gradient(to top, rgba(0,0,0,.8), transparent);
  display: flex; align-items: center; gap: 14px;
}
.player-progress {
  flex: 1; height: 4px; border-radius: 2px;
  background: rgba(255,255,255,.2); position: relative; cursor: pointer;
}
.player-progress .progress-fill { height: 100%; border-radius: 2px; background: var(--grad-hero); width: 34%; }
.player-time { font-size: 13px; color: rgba(255,255,255,.9); font-variant-numeric: tabular-nums; }

/* ---------- 实时条目 ---------- */
.live-item { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--border-subtle); }
.live-item:last-child { border-bottom: none; }
.live-item .live-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--brand-green); box-shadow: 0 0 8px var(--brand-green); flex-shrink: 0; }
.live-item .live-text { flex: 1; font-size: 14px; color: var(--text-secondary); }
.live-item .live-time { font-size: 12px; color: var(--text-muted); font-variant-numeric: tabular-nums; }

/* ---------- 网格工具 ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }

/* ---------- 文字链接箭头 ---------- */
.arrow-link { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--brand-pink); }
.arrow-link:hover { gap: 10px; }

/* ---------- ====== 响应式 ====== ---------- */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { order: -1; max-width: 360px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .short-grid { grid-template-columns: repeat(4, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .download-hero { grid-template-columns: 1fr; }
  .download-visual { max-width: 320px; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
  .nav-links, .nav-actions .btn { display: none; }
  .nav-toggle { display: flex; }
  .hero { padding: 130px 0 80px; }
  .hero-stats { gap: 24px; }
  .features-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .short-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); padding: 32px 24px; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 14px; text-align: center; }
  .cta-band { padding: 40px 24px; }
  .guide-grid { grid-template-columns: 1fr; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .platforms { justify-content: center; }
  .orbit-node { width: 44px; height: 44px; font-size: 18px; margin: -22px; }
  .orbit-core { font-size: 26px; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .short-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .section-head h2 { font-size: 26px; }
  .stat-item .stat-num { font-size: 30px; }
}

/* ---------- 减少动画偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 焦点态 ---------- */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--brand-violet);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 选区 ---------- */
::selection { background: rgba(236,72,153,.35); color: #fff; }

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--bg-elevated); border-radius: 5px; border: 2px solid var(--bg-deep); }
::-webkit-scrollbar-thumb:hover { background: var(--brand-violet); }