/* ============================================================
   有五个姐姐的我 — 设计系统 style.css
   方向：电影感深色 × 暖珊瑚红 × 琥珀金 × 玻璃拟态
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 背景层 */
  --bg-0: #0b0910;          /* 最深底 */
  --bg-1: #120e1a;          /* 主背景 */
  --bg-2: #1a1426;          /* 次背景 */
  --bg-3: #241c34;          /* 卡片背景 */
  --bg-glass: rgba(26, 20, 38, 0.55);

  /* 强调色 */
  --coral: #ff5d6c;         /* 珊瑚红 主强调 */
  --coral-soft: #ff8a95;
  --amber: #ffb454;         /* 琥珀金 */
  --violet: #8b6fd4;        /* 紫罗兰 氛围 */
  --rose: #ff7eb3;          /* 玫瑰粉 */

  /* 文字 */
  --text-1: #f6f1ea;        /* 主文字 暖白 */
  --text-2: #b8b0c8;        /* 次文字 */
  --text-3: #7d7590;        /* 弱文字 */

  /* 边框 / 分隔 */
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);

  /* 渐变 */
  --grad-warm: linear-gradient(135deg, #ff5d6c 0%, #ffb454 100%);
  --grad-violet: linear-gradient(135deg, #8b6fd4 0%, #ff7eb3 100%);
  --grad-hero: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(255, 93, 108, 0.22) 0%, rgba(139, 111, 212, 0.12) 40%, transparent 70%);

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.55);
  --shadow-coral: 0 12px 40px rgba(255, 93, 108, 0.35);

  /* 圆角 */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;
  --r-full: 999px;

  /* 字体 */
  --font-display: 'Fraunces', 'Noto Serif SC', 'Source Han Serif SC', serif;
  --font-body: 'Manrope', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* 尺寸 */
  --nav-h: 72px;
  --maxw: 1240px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 0.2s var(--ease);
  --t: 0.4s var(--ease);
}

/* ---------- 2. 重置与基础 ---------- */
*, *::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-1);
  color: var(--text-1);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

/* 全局氛围背景：多层光晕 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 50% 40% at 15% 8%, rgba(255, 93, 108, 0.10), transparent 70%),
    radial-gradient(ellipse 50% 40% at 85% 12%, rgba(139, 111, 212, 0.10), transparent 70%),
    radial-gradient(ellipse 60% 50% at 50% 100%, rgba(255, 180, 84, 0.06), transparent 70%);
  pointer-events: none;
}

/* 噪点纹理叠加 */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  opacity: 0.035;
  pointer-events: none;
  mix-blend-mode: overlay;
}

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

::selection { background: var(--coral); color: #fff; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: var(--bg-3); border-radius: 10px; border: 2px solid var(--bg-0); }
::-webkit-scrollbar-thumb:hover { background: var(--violet); }

/* ---------- 3. 排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.display {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3rem, 8vw, 6.5rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.serif { font-family: var(--font-display); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--coral-soft);
}
.eyebrow::before {
  content: '';
  width: 28px; height: 2px;
  background: var(--grad-warm);
  border-radius: 2px;
}

.text-grad {
  background: var(--grad-warm);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-grad-violet {
  background: var(--grad-violet);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.lead {
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  color: var(--text-2);
  line-height: 1.75;
}

/* ---------- 4. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: clamp(60px, 9vw, 110px) 0; position: relative; }

.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head h2 {
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  margin: 16px 0 18px;
}
.section-head p { color: var(--text-2); font-size: 1.08rem; }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

/* ---------- 5. 导航栏 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background var(--t), border-color var(--t), backdrop-filter var(--t);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(11, 9, 16, 0.78);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom-color: var(--line);
}
.nav-inner {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}
.brand-mark {
  width: 38px; height: 38px;
  border-radius: 11px;
  background: var(--grad-warm);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
  box-shadow: var(--shadow-coral);
  position: relative;
}
.brand-mark::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 14px;
  background: var(--grad-warm);
  opacity: 0.3;
  filter: blur(8px);
  z-index: -1;
}
.brand small { display: block; font-size: 0.62rem; font-weight: 600; letter-spacing: 0.18em; color: var(--text-3); font-family: var(--font-body); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  padding: 8px 16px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-2);
  border-radius: var(--r-full);
  transition: color var(--t-fast), background var(--t-fast);
}
.nav-links a:hover { color: var(--text-1); background: rgba(255,255,255,0.05); }
.nav-links a.active { color: var(--text-1); }

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

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  border-radius: 12px;
  align-items: center; justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: transform var(--t), opacity var(--t);
}
.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); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--r-full);
  transition: transform var(--t-fast), box-shadow var(--t), background var(--t), color var(--t);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn:active { transform: scale(0.96); }

.btn-primary {
  background: var(--grad-warm);
  color: #fff;
  box-shadow: var(--shadow-coral);
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #ff7e8c, #ffc87a);
  opacity: 0;
  transition: opacity var(--t);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 48px rgba(255, 93, 108, 0.5); }
.btn-primary:hover::before { opacity: 1; }
.btn-primary span, .btn-primary svg { position: relative; z-index: 1; }

.btn-ghost {
  background: rgba(255,255,255,0.06);
  color: var(--text-1);
  border: 1px solid var(--line-strong);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover { background: rgba(255,255,255,0.12); border-color: var(--coral); transform: translateY(-2px); }

.btn-violet {
  background: var(--grad-violet);
  color: #fff;
  box-shadow: 0 12px 40px rgba(139, 111, 212, 0.35);
}
.btn-violet:hover { transform: translateY(-2px); box-shadow: 0 16px 50px rgba(139, 111, 212, 0.5); }

.btn-lg { padding: 18px 38px; font-size: 1.05rem; }
.btn-sm { padding: 10px 20px; font-size: 0.85rem; }

/* ---------- 7. 卡片 ---------- */
.card {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 28px;
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.card-hover:hover {
  transform: translateY(-6px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md);
}

/* ---------- 8. Hero ---------- */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + 60px) 0 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--grad-hero);
}
.hero-inner { max-width: 880px; }
.hero h1 {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  margin: 20px 0 24px;
}
.hero h1 .line { display: block; }

/* ---------- 9. 角色卡片 ---------- */
.sister-card {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--bg-2);
  border: 1px solid var(--line);
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.sister-card:hover {
  transform: translateY(-8px);
  border-color: var(--coral);
  box-shadow: 0 20px 50px rgba(255, 93, 108, 0.2);
}
.sister-avatar {
  aspect-ratio: 4/4.5;
  position: relative;
  overflow: hidden;
}
.sister-avatar .art {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 5rem;
  color: rgba(255,255,255,0.9);
}
.sister-avatar .tag {
  position: absolute;
  top: 14px; left: 14px;
  padding: 6px 12px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-radius: var(--r-full);
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.15);
}
.sister-info { padding: 22px 22px 26px; }
.sister-info h3 { font-size: 1.4rem; margin-bottom: 6px; }
.sister-info .role { color: var(--coral-soft); font-size: 0.82rem; font-weight: 700; letter-spacing: 0.05em; }
.sister-info p { color: var(--text-2); font-size: 0.9rem; margin-top: 10px; line-height: 1.6; }

/* ---------- 10. 剧集卡片 ---------- */
.drama-card {
  position: relative;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--bg-2);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: transform var(--t), box-shadow var(--t);
}
.drama-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.drama-thumb {
  aspect-ratio: 3/4;
  position: relative;
  overflow: hidden;
}
.drama-thumb .art {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 3rem;
  color: rgba(255,255,255,0.85);
  text-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
.drama-thumb .badge {
  position: absolute;
  top: 12px; left: 12px;
  padding: 5px 10px;
  font-size: 0.7rem;
  font-weight: 700;
  border-radius: var(--r-sm);
  background: var(--coral);
  color: #fff;
}
.drama-thumb .play {
  position: absolute;
  inset: 0;
  display: grid; place-items: center;
  background: rgba(11,9,16,0);
  transition: background var(--t);
}
.drama-card:hover .play { background: rgba(11,9,16,0.55); }
.play-icon {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: rgba(255,255,255,0.95);
  display: grid; place-items: center;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity var(--t), transform var(--t);
  color: var(--coral);
}
.drama-card:hover .play-icon { opacity: 1; transform: scale(1); }
.drama-meta { padding: 14px 16px 18px; }
.drama-meta h3 { font-size: 1.05rem; margin-bottom: 4px; }
.drama-meta .info { font-size: 0.8rem; color: var(--text-3); display: flex; gap: 10px; }

/* ---------- 11. 播放器 ---------- */
.player-wrap {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: #000;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-lg);
}
.player-stage {
  aspect-ratio: 16/9;
  position: relative;
  background: linear-gradient(135deg, #1a1426 0%, #0b0910 100%);
  display: grid; place-items: center;
  overflow: hidden;
}
.player-stage::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(255,93,108,0.15), transparent 60%);
}
.play-btn-big {
  width: 88px; height: 88px;
  border-radius: 50%;
  background: var(--grad-warm);
  display: grid; place-items: center;
  box-shadow: var(--shadow-coral);
  transition: transform var(--t);
  position: relative; z-index: 2;
}
.play-btn-big:hover { transform: scale(1.1); }
.player-stage .stage-label {
  position: absolute;
  bottom: 24px; left: 24px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  z-index: 2;
}
.player-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  background: rgba(0,0,0,0.4);
  border-top: 1px solid var(--line);
}
.player-progress {
  flex: 1;
  height: 5px;
  background: rgba(255,255,255,0.15);
  border-radius: 5px;
  position: relative;
  cursor: pointer;
}
.player-progress .fill {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 34%;
  background: var(--grad-warm);
  border-radius: 5px;
}
.player-progress .knob {
  position: absolute;
  left: 34%; top: 50%;
  transform: translate(-50%, -50%);
  width: 14px; height: 14px;
  border-radius: 50%;
  background: #fff;
  box-shadow: var(--shadow-sm);
}
.player-time { font-size: 0.82rem; color: var(--text-2); font-variant-numeric: tabular-nums; }

/* ---------- 12. 数据条 ---------- */
.stat-row { display: flex; flex-wrap: wrap; gap: 40px; }
.stat { }
.stat .num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  line-height: 1;
}
.stat .label { color: var(--text-3); font-size: 0.85rem; margin-top: 8px; letter-spacing: 0.05em; }

/* ---------- 13. 特色卡 ---------- */
.feature {
  padding: 32px 28px;
  border-radius: var(--r-lg);
  background: var(--bg-glass);
  border: 1px solid var(--line);
  transition: transform var(--t), border-color var(--t);
}
.feature:hover { transform: translateY(-4px); border-color: var(--coral); }
.feature .ico {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: grid; place-items: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}
.feature h3 { font-size: 1.25rem; margin-bottom: 10px; }
.feature p { color: var(--text-2); font-size: 0.92rem; }

/* ---------- 14. 时间线 / 剧情 ---------- */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 8px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--coral), var(--violet), transparent);
}
.tl-item { position: relative; padding-bottom: 40px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: '';
  position: absolute;
  left: -28px; top: 4px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg-1);
  border: 3px solid var(--coral);
  box-shadow: 0 0 0 4px rgba(255,93,108,0.15);
}
.tl-item .ep { font-size: 0.78rem; color: var(--coral-soft); font-weight: 700; letter-spacing: 0.1em; }
.tl-item h3 { font-size: 1.25rem; margin: 6px 0 10px; }
.tl-item p { color: var(--text-2); font-size: 0.92rem; }

/* ---------- 15. 下载区 ---------- */
.download-cta {
  position: relative;
  border-radius: var(--r-xl);
  padding: clamp(40px, 6vw, 70px);
  background: linear-gradient(135deg, rgba(255,93,108,0.15), rgba(139,111,212,0.12));
  border: 1px solid var(--line-strong);
  overflow: hidden;
}
.download-cta::before {
  content: '';
  position: absolute;
  top: -50%; right: -20%;
  width: 60%; height: 200%;
  background: radial-gradient(circle, rgba(255,93,108,0.18), transparent 60%);
  pointer-events: none;
}
.dl-buttons { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 32px; }
.dl-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 26px;
  border-radius: var(--r-md);
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--line-strong);
  backdrop-filter: blur(10px);
  transition: transform var(--t-fast), background var(--t), border-color var(--t);
}
.dl-btn:hover { transform: translateY(-3px); background: rgba(255,255,255,0.14); border-color: var(--coral); }
.dl-btn .ico { font-size: 2rem; }
.dl-btn .txt small { display: block; font-size: 0.7rem; color: var(--text-3); }
.dl-btn .txt strong { font-family: var(--font-display); font-size: 1.1rem; }

/* ---------- 16. 社区 ---------- */
.post-card {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-radius: var(--r-md);
  background: var(--bg-glass);
  border: 1px solid var(--line);
  transition: border-color var(--t), transform var(--t);
}
.post-card:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.post-avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  flex-shrink: 0;
  display: grid; place-items: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}
.post-body { flex: 1; min-width: 0; }
.post-meta { display: flex; gap: 10px; align-items: center; font-size: 0.8rem; color: var(--text-3); }
.post-body p { margin: 8px 0; color: var(--text-1); font-size: 0.92rem; }
.post-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag-pill {
  padding: 4px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: var(--r-full);
  background: rgba(255,93,108,0.12);
  color: var(--coral-soft);
  border: 1px solid rgba(255,93,108,0.2);
}
.post-actions { display: flex; gap: 18px; margin-top: 12px; }
.post-actions button {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.82rem; color: var(--text-3);
  transition: color var(--t-fast);
}
.post-actions button:hover { color: var(--coral); }

/* ---------- 17. 页脚 ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 60px 0 36px;
  margin-top: 40px;
  background: rgba(11,9,16,0.6);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer h4 { font-size: 0.82rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-3); margin-bottom: 18px; font-family: var(--font-body); font-weight: 700; }
.footer-links li { margin-bottom: 12px; }
.footer-links a { color: var(--text-2); font-size: 0.9rem; transition: color var(--t-fast); }
.footer-links a:hover { color: var(--coral); }
.footer-desc { color: var(--text-2); font-size: 0.9rem; margin-top: 16px; max-width: 320px; line-height: 1.7; }
.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--text-3);
  font-size: 0.82rem;
}
.social-row { display: flex; gap: 10px; }
.social-row a {
  width: 38px; height: 38px;
  border-radius: 10px;
  display: grid; place-items: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--line);
  transition: background var(--t), border-color var(--t), transform var(--t);
  font-size: 1.1rem;
}
.social-row a:hover { background: var(--coral); border-color: var(--coral); transform: translateY(-2px); }

/* ---------- 18. 动效 ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
@keyframes pulse-ring {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(1.6); opacity: 0; }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }

.reveal-stagger > * { opacity: 0; transform: translateY(30px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal-stagger.in > * { opacity: 1; transform: translateY(0); }
.reveal-stagger.in > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger.in > *:nth-child(2) { transition-delay: 0.12s; }
.reveal-stagger.in > *:nth-child(3) { transition-delay: 0.19s; }
.reveal-stagger.in > *:nth-child(4) { transition-delay: 0.26s; }
.reveal-stagger.in > *:nth-child(5) { transition-delay: 0.33s; }
.reveal-stagger.in > *:nth-child(6) { transition-delay: 0.40s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .reveal, .reveal-stagger > * { opacity: 1; transform: none; }
}

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --nav-h: 64px; }
  .container { padding: 0 18px; }

  .nav-links {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 18px 24px;
    background: rgba(11,9,16,0.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-130%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--t), opacity var(--t);
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 14px 16px; font-size: 1rem; border-radius: var(--r-sm); }
  .nav-links a.active { background: rgba(255,93,108,0.12); }

  .nav-toggle { display: flex; }
  .nav-actions .btn-sm { display: none; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-auto { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; }

  .section { padding: 48px 0; }
  .section-head { margin-bottom: 36px; }
  .stat-row { gap: 24px; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; }

  .dl-buttons { flex-direction: column; }
  .dl-btn { width: 100%; }

  .hero { padding: calc(var(--nav-h) + 40px) 0 60px; }
}

@media (max-width: 480px) {
  .display { font-size: 2.6rem; }
  .hero h1 { font-size: 2.4rem; }
  .card, .feature { padding: 22px; }
  .sister-avatar .art { font-size: 3.5rem; }
  .stat-row { gap: 20px; }
  .play-btn-big { width: 68px; height: 68px; }
}