/* ============================================================
   最好的一天 · 官网样式（Apple 风格重构）
   品牌色：Bay Blue #0077B6  ·  极简 · 留白 · 柔和
   ============================================================ */

:root {
  /* 品牌与中性色（浅色） */
  --bg: #fbfbfd;
  --bg-alt: #f5f5f7;
  --bg-elev: #ffffff;
  --ink: #1d1d1f;
  --ink-2: #6e6e73;
  --ink-3: #86868b;
  --line: rgba(0, 0, 0, 0.10);
  --line-soft: rgba(0, 0, 0, 0.06);
  --accent: #0077b6;
  --accent-hover: #0090d6;
  --accent-soft: rgba(0, 119, 182, 0.10);
  --on-accent: #ffffff;

  /* 五个小伙伴（柔和版） */
  --pink: #f6a8c6;
  --blue: #8ed0ec;
  --green: #9bd9a8;
  --yellow: #f4d77a;
  --red: #f3a596;

  /* 设备外壳 */
  --device-bezel: linear-gradient(160deg, #f0f0f3, #d9d9de);
  --device-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.30), 0 8px 20px -8px rgba(0, 0, 0, 0.18);

  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --shell: min(1080px, calc(100vw - 40px));
  --header-h: 56px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --maxw: 1080px;
}

[data-theme="dark"] {
  --bg: #000000;
  --bg-alt: #0a0a0c;
  --bg-elev: #161618;
  --ink: #f5f5f7;
  --ink-2: #a1a1a6;
  --ink-3: #6e6e73;
  --line: rgba(255, 255, 255, 0.14);
  --line-soft: rgba(255, 255, 255, 0.08);
  --accent: #4aa6e0;
  --accent-hover: #6cb9e8;
  --accent-soft: rgba(74, 166, 224, 0.16);
  --on-accent: #04121c;
  --device-bezel: linear-gradient(160deg, #2a2a2e, #151517);
  --device-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.7), 0 8px 20px -8px rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.5;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--accent-soft); }

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -64px;
  z-index: 200;
  padding: 12px 18px;
  border-radius: 12px;
  background: var(--ink);
  color: var(--bg);
  font-size: 14px;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 16px; }

/* ---------- 导航 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), backdrop-filter 0.3s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom-color: var(--line);
}
.nav {
  height: var(--header-h);
  width: var(--shell);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 28px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.brand img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.12);
}
.nav-links {
  display: flex;
  gap: 30px;
  margin-left: auto;
}
.nav-links a {
  font-size: 14px;
  color: var(--ink-2);
  transition: color 0.2s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 4px;
}
.theme-toggle {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: color-mix(in srgb, var(--bg-elev) 60%, transparent);
  color: var(--ink-2);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink-3); transform: rotate(12deg); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: 980px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 14px;
  font-weight: 600;
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn-download:hover { background: var(--accent-hover); transform: translateY(-1px); }

/* ---------- 通用排版 ---------- */
.kicker {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent);
  text-transform: none;
}
.section-head { max-width: 720px; }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head h2 {
  margin: 14px 0 0;
  font-size: clamp(32px, 4.4vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 650;
  color: var(--ink);
}
.section-head p {
  margin: 18px 0 0;
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--ink-2);
  line-height: 1.6;
}

/* ---------- 按钮 ---------- */
.appstore {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  padding: 12px 22px;
  border-radius: 980px;
  background: var(--ink);
  color: var(--bg);
  font-size: 17px;
  font-weight: 600;
  box-shadow: 0 10px 24px -10px rgba(0, 0, 0, 0.4);
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}
.appstore:hover { transform: translateY(-2px); opacity: 0.92; }
.appstore svg { width: 26px; height: 30px; fill: currentColor; }
.appstore span { display: flex; flex-direction: column; line-height: 1.05; }
.appstore small { font-size: 10px; font-weight: 500; opacity: 0.75; }
.appstore b { font-size: 18px; font-weight: 600; letter-spacing: -0.01em; }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 16px;
  font-weight: 500;
  color: var(--accent);
}
.text-link .arrow {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: transform 0.25s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}
.text-link:hover .arrow { background: var(--accent); color: var(--on-accent); border-color: transparent; transform: translateY(2px); }

/* ---------- HERO ---------- */
.hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(40px, 9vh, 96px)) 0 clamp(40px, 8vh, 88px);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -10%;
  right: -5%;
  width: 60vw;
  height: 60vw;
  max-width: 820px;
  max-height: 820px;
  background: radial-gradient(circle at 50% 50%, var(--accent-soft), transparent 62%);
  filter: blur(10px);
  z-index: 0;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(24px, 5vw, 72px);
}
.hero-copy { max-width: 520px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 20px;
  padding: 7px 14px 7px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-2);
  background: color-mix(in srgb, var(--bg-elev) 70%, transparent);
  border: 1px solid var(--line-soft);
  border-radius: 980px;
}
.eyebrow .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.hero h1 {
  margin: 0;
  font-size: clamp(40px, 6vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  font-weight: 680;
}
.hero h1 .accent { color: var(--accent); }
.hero-lead {
  margin: 22px 0 0;
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.6;
  color: var(--ink-2);
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-top: 32px;
  flex-wrap: wrap;
}
.hero-meta {
  margin: 22px 0 0;
  font-size: 13px;
  color: var(--ink-3);
}

/* 设备外壳 */
.hero-visual { position: relative; display: grid; place-items: center; min-height: 560px; }
.device {
  position: relative;
  padding: 12px;
  border-radius: 52px;
  background: var(--device-bezel);
  box-shadow: var(--device-shadow);
  width: min(300px, 78%);
}
.device .screen {
  width: 100%;
  height: auto;
  border-radius: 40px;
  display: block;
  background: #000;
}
.float-ball {
  position: absolute;
  width: 76px;
  height: 76px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 14px 30px -10px rgba(0, 0, 0, 0.35);
  animation: floaty 6s ease-in-out infinite;
}
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.fb-1 { top: 4%; left: -4%; animation-delay: 0s; }
.fb-2 { top: 30%; right: -6%; width: 60px; height: 60px; animation-delay: -1.4s; }
.fb-3 { bottom: 10%; left: -2%; width: 64px; height: 64px; animation-delay: -2.6s; }
.fb-4 { bottom: 22%; right: -2%; width: 54px; height: 54px; animation-delay: -3.4s; }

/* ---------- 功能条 ---------- */
.feature-strip {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: var(--bg-alt);
}
.feature-strip .shell {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  padding: 22px 20px;
}
.chip {
  padding: 9px 16px;
  border-radius: 980px;
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--ink-2);
  font-weight: 500;
}

/* ---------- 五球 ---------- */
.friends {
  position: relative;
  padding: clamp(72px, 10vw, 132px) 0 clamp(96px, 14vw, 168px);
}
.friends::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--line) 20%, var(--line) 80%, transparent);
  pointer-events: none;
}
.friend-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  margin-top: 54px;
}
.friend-card {
  position: relative;
  padding: 30px 22px 26px;
  border-radius: var(--radius-lg);
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  box-shadow: 0 12px 30px -22px rgba(0, 0, 0, 0.4);
  text-align: center;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  overflow: hidden;
}
.friend-card:hover { transform: translateY(-6px); box-shadow: 0 22px 44px -24px rgba(0, 0, 0, 0.45); }
.friend-card .ball {
  width: 88px;
  height: 88px;
  margin: 0 auto 18px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 48%;
  box-shadow: 0 12px 24px -10px rgba(0, 0, 0, 0.35);
  background: var(--bg-alt);
}
.friend-card .num {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: 0.1em;
}
.friend-card h3 {
  margin: 8px 0 8px;
  font-size: 21px;
  font-weight: 620;
  letter-spacing: -0.01em;
}
.friend-card p { margin: 0; font-size: 14px; color: var(--ink-2); line-height: 1.55; }

/* ---------- 功能行（图文交替） ---------- */
.features { padding: clamp(40px, 6vw, 72px) 0 clamp(72px, 10vw, 132px); }
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(28px, 6vw, 88px);
  padding: clamp(48px, 7vw, 96px) 0;
}
.feature-row + .feature-row { border-top: 1px solid var(--line-soft); }
.feature-row.reverse .feature-copy { order: 2; }
.feature-row.reverse .device-wrap { order: 1; }
.feature-copy { max-width: 460px; }
.feature-copy .tag {
  display: inline-block;
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}
.feature-copy h3 {
  margin: 0;
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 640;
}
.feature-copy p {
  margin: 16px 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  color: var(--ink-2);
  line-height: 1.65;
}
.feature-points {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}
.feature-points li {
  padding: 7px 13px;
  border-radius: 980px;
  border: 1px solid var(--line);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-2);
}
.feature-points .free { color: var(--accent); border-color: var(--accent-soft); background: var(--accent-soft); }
.feature-points .pro { color: var(--ink-2); }
.device-wrap { display: grid; place-items: center; }
.device-wrap .device { width: min(290px, 80%); }

/* ---------- 生态（Apple Watch + 番茄钟）深色 ---------- */
.ecosystem {
  background: #050507;
  color: #f5f5f7;
  padding: clamp(72px, 10vw, 132px) 0;
}
[data-theme="dark"] .ecosystem { background: #050507; }
.ecosystem .section-head h2 { color: #f5f5f7; }
.ecosystem .section-head p { color: rgba(255, 255, 255, 0.66); }
.ecosystem .kicker { color: #6cb9e8; }
.eco-visual {
  position: relative;
  margin-top: 56px;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  align-items: center;
  gap: 40px;
}
.eco-phone { display: grid; place-items: center; }
.eco-phone .device { width: min(280px, 70%); }
.eco-watches {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  align-items: end;
}
.watch-shot {
  margin: 0;
  display: flex;
  flex-direction: column;
}
.watch-label {
  display: block;
  margin: 0 0 10px 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: #6cb9e8;
}
.watch-frame-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 13 / 20; /* matches the real frame 520x800 */
  filter: drop-shadow(0 24px 40px -14px rgba(0, 0, 0, 0.75))
          drop-shadow(0 8px 16px -8px rgba(0, 0, 0, 0.6));
  transition: transform 0.35s var(--ease), filter 0.35s var(--ease);
}
.watch-shot:hover .watch-frame-img {
  transform: translateY(-6px);
  filter: drop-shadow(0 30px 50px -12px rgba(0, 0, 0, 0.85))
          drop-shadow(0 10px 20px -6px rgba(0, 0, 0, 0.7));
}
.eco-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 56px;
}
.eco-card {
  padding: 26px 22px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
}
.eco-card .badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 980px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}
.eco-card .badge.free { background: rgba(155, 217, 168, 0.2); color: #9bd9a8; }
.eco-card .badge.pro { background: rgba(108, 185, 232, 0.2); color: #6cb9e8; }
.eco-card h3 { margin: 0 0 8px; font-size: 18px; font-weight: 620; }
.eco-card p { margin: 0; font-size: 13px; color: rgba(255, 255, 255, 0.62); line-height: 1.55; }

/* ---------- 歌词 ---------- */
.lyrics {
  padding: clamp(96px, 14vw, 168px) 0 clamp(72px, 10vw, 132px);
  background: var(--bg-alt);
}
.lyrics .shell {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(36px, 6vw, 80px);
}
.lyrics .kicker { color: var(--accent); }
.lyrics-copy h2 {
  margin: 14px 0 0;
  font-size: clamp(30px, 3.6vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 650;
  color: var(--ink);
}
.lyrics-copy p { margin: 18px 0 0; font-size: clamp(16px, 1.6vw, 19px); color: var(--ink-2); line-height: 1.65; }
.lyric-card {
  position: relative;
  padding: clamp(34px, 4vw, 52px);
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, #0090d6, #0077b6 55%, #005f93);
  color: #fff;
  box-shadow: 0 30px 60px -28px rgba(0, 119, 182, 0.6);
  text-align: center;
  overflow: hidden;
}
.lyric-card::after {
  content: "";
  position: absolute;
  inset: auto -20% -40% auto;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.18), transparent 60%);
  border-radius: 50%;
}
.record {
  width: 168px;
  height: 168px;
  margin: 0 auto 26px;
  padding: 16px;
  border-radius: 50%;
  background: repeating-radial-gradient(circle, #1a1a1a 0 5px, #0d0d0d 6px 12px);
  box-shadow: 0 16px 32px -12px rgba(0, 0, 0, 0.5);
  animation: spin 16s linear infinite;
}
.record img { width: 100%; height: 100%; border-radius: 50%; border: 4px solid #fff; object-fit: cover; }
@keyframes spin { to { transform: rotate(360deg); } }
.lyric-card .label { margin: 0; font-size: 12px; font-weight: 700; letter-spacing: 0.1em; opacity: 0.9; }
.lyric-card blockquote {
  margin: 14px 0 6px;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.4;
  font-weight: 640;
  letter-spacing: -0.01em;
  min-height: 84px;
  display: grid;
  place-items: center;
}
.lyric-card .song { font-size: 13px; opacity: 0.85; }
.lyric-progress { height: 4px; margin: 26px 0 20px; border-radius: 4px; background: rgba(255, 255, 255, 0.25); overflow: hidden; }
.lyric-progress i { display: block; height: 100%; background: #fff; border-radius: 4px; transition: width 0.4s var(--ease); }
.lyric-controls { display: flex; align-items: center; justify-content: center; gap: 18px; }
.lyric-controls button {
  padding: 10px 18px;
  border-radius: 980px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s var(--ease), transform 0.15s var(--ease);
}
.lyric-controls button:hover:not(:disabled) { background: rgba(255, 255, 255, 0.24); }
.lyric-controls button:active:not(:disabled) { transform: scale(0.96); }
.lyric-controls button:disabled { opacity: 0.4; cursor: default; }
.lyric-controls .play {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: none;
  background: #fff;
  color: #0077b6;
  font-size: 18px;
}

/* ---------- 隐私 ---------- */
.privacy { padding: clamp(72px, 10vw, 132px) 0; }
.privacy .shell {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(36px, 6vw, 80px);
}
.privacy-cards { display: grid; gap: 14px; }
.privacy-card {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 22px 24px;
  border-radius: var(--radius-md);
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  box-shadow: 0 12px 30px -24px rgba(0, 0, 0, 0.4);
}
.privacy-card .ic {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 20px;
}
.privacy-card h3 { margin: 0 0 4px; font-size: 17px; font-weight: 620; }
.privacy-card p { margin: 0; font-size: 14px; color: var(--ink-2); line-height: 1.55; }
.privacy a.text-link { margin-top: 22px; }

/* ---------- 价格 ---------- */
.pricing { padding: clamp(72px, 10vw, 132px) 0; background: var(--bg-alt); }
.pricing-card {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: 920px;
  margin-inline: auto;
  padding: clamp(36px, 5vw, 64px);
  border-radius: var(--radius-lg);
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  box-shadow: 0 30px 60px -34px rgba(0, 0, 0, 0.4);
}
.pricing-card .kicker { color: var(--accent); }
.pricing-card h2 {
  margin: 12px 0 16px;
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 650;
}
.pricing-card > div > p { margin: 0; font-size: 16px; color: var(--ink-2); line-height: 1.65; }
.tier-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 12px; padding: 0; list-style: none; }
.tier-list li {
  padding: 7px 12px;
  border-radius: 980px;
  font-size: 12px;
  font-weight: 500;
  background: var(--accent-soft);
  color: var(--accent);
}
.pricing-card small { font-size: 12px; color: var(--ink-3); }
.price-badge {
  justify-self: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 36px 44px;
  border-radius: 28px;
  background: linear-gradient(155deg, #0090d6, #0077b6);
  color: #fff;
  text-align: center;
  box-shadow: 0 24px 48px -22px rgba(0, 119, 182, 0.7);
}
.price-badge .pre { font-size: 13px; opacity: 0.85; }
.price-badge .amount { font-size: 60px; font-weight: 700; letter-spacing: -0.03em; line-height: 1; }
.price-badge .per { font-size: 15px; opacity: 0.9; }

/* ---------- 结尾 CTA ---------- */
.cta {
  padding: clamp(80px, 12vw, 160px) 0;
  text-align: center;
}
.cta .friends-row {
  display: flex;
  justify-content: center;
  margin-bottom: 36px;
}
.cta .friends-row img {
  width: 64px; height: 64px;
  margin-left: -14px;
  border-radius: 50%;
  border: 3px solid var(--bg);
  object-fit: cover;
  box-shadow: 0 8px 18px -8px rgba(0, 0, 0, 0.35);
}
.cta .friends-row img:first-child { margin-left: 0; }
.cta h2 {
  margin: 0 auto;
  max-width: 16ch;
  font-size: clamp(32px, 5vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 660;
}
.cta .appstore { margin-top: 34px; }
.cta .legal { margin-top: 30px; display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.cta .legal a { font-size: 13px; color: var(--ink-3); }
.cta .legal a:hover { color: var(--ink); }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--line-soft);
  background: var(--bg-alt);
}
.footer .shell {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 30px 20px;
  flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.footer-brand img { width: 30px; height: 30px; border-radius: 8px; }
.footer-brand small { display: block; font-weight: 400; font-size: 12px; color: var(--ink-3); }
.footer-links { display: flex; gap: 22px; margin-left: auto; flex-wrap: wrap; }
.footer-links a { font-size: 13px; color: var(--ink-2); }
.footer-links a:hover { color: var(--ink); }
.footer .copy { font-size: 12px; color: var(--ink-3); width: 100%; }

/* ---------- 详情页庆祝特效（亮点） ---------- */
.celebrate { padding: clamp(72px, 10vw, 132px) 0; }
.celebrate-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: clamp(40px, 6vw, 72px);
}
.celebrate-phone { display: grid; place-items: center; }
.celebrate-phone .device { width: min(290px, 80%); }
.celebrate-screen { position: relative; overflow: hidden; background: transparent; }
.celebrate-screen .screen-video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: var(--bg-1);
}

.celebrate-actions { display: flex; flex-direction: column; align-items: center; gap: 10px; margin-top: 30px; }
.celebrate-replay {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 980px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--accent);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}
.celebrate-replay:hover { transform: translateY(-1px); border-color: var(--accent); background: var(--accent-soft); }
.celebrate-replay:active { transform: scale(0.97); }
.celebrate-replay .rp-ic { font-size: 16px; }
.celebrate-note { margin: 0; font-size: 12px; color: var(--ink-3); }

/* 详情页庆祝区使用真实 App 录屏（见 .screen-video），自动循环播放；
   reduced-motion 下视频仍以温和的 3.5s 节奏循环，作为该区唯一的动效。 */

/* ---------- 滚动揭示 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .friend-grid { grid-template-columns: repeat(3, 1fr); }
  .friend-card:last-child { grid-column: 2; }
  .feature-row, .lyrics .shell, .privacy .shell, .pricing-card, .eco-visual {
    grid-template-columns: 1fr;
  }
  .feature-row.reverse .feature-copy,
  .feature-row.reverse .device-wrap { order: 0; }
  .feature-copy { max-width: none; }
  .device-wrap .device, .eco-phone .device { width: min(280px, 80%); }
  .eco-watches { margin-top: 8px; }
  .eco-grid { grid-template-columns: repeat(2, 1fr); }
  .price-badge { justify-self: start; }
}

@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav { gap: 14px; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-copy { max-width: none; }
  .hero-visual { min-height: 480px; margin-top: 12px; }
}

@media (max-width: 560px) {
  :root { --shell: calc(100vw - 36px); }
  .brand span { display: none; }
  .friend-grid { grid-template-columns: repeat(2, 1fr); }
  .friend-card:last-child { grid-column: 1 / -1; }
  .friend-card:last-child .ball { width: 72px; height: 72px; }
  .eco-grid { grid-template-columns: 1fr; }
  .eco-watches { grid-template-columns: repeat(3, 1fr); }
  .footer-links { width: 100%; margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (scripting: none) {
  .reveal { opacity: 1; transform: none; }
}