/* 分享家 官网样式 —— 克制系 iOS 简约,与 App design_tokens 同源。
   品牌 indigo #5856D6 / 暖白底 #F5F4F1 / 发丝线 8% 黑。无彩色渐变、无 emoji。 */
:root {
  --brand: #5856D6;
  --brand-pressed: #4644B8;
  --brand-tint: #ECECFB;
  --bg-base: #F5F4F1;
  --bg-elevated: #FFFFFF;
  --bg-secondary: #EFEEEA;
  --text-primary: rgba(0, 0, 0, 0.9);
  --text-secondary: rgba(0, 0, 0, 0.55);
  --text-tertiary: rgba(0, 0, 0, 0.35);
  --separator: rgba(0, 0, 0, 0.08);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --shadow-soft: 0 18px 50px rgba(0, 0, 0, 0.08);
  --maxw: 1040px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-pressed); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.eyebrow {
  color: var(--brand);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

/* ── 滚动渐显(克制:12px 上浮 + 淡入,一次性)── */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }
.delay-1 { transition-delay: 0.12s; }

/* ── 顶栏 ── */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(245, 244, 241, 0.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--separator);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 18px; color: var(--text-primary); }
.brand img { width: 30px; height: 30px; }
.brand .en { color: var(--text-tertiary); font-weight: 500; font-size: 14px; }
.nav-links { display: flex; gap: 26px; font-size: 15px; }
.nav-links a { color: var(--text-secondary); }
.nav-links a:hover { color: var(--text-primary); }

/* ── Hero:左文右手机 ── */
.hero { padding: 84px 0 40px; overflow: hidden; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}
.hero h1 { font-size: 52px; line-height: 1.22; font-weight: 700; letter-spacing: 0.01em; }
.hero .sub { margin-top: 20px; font-size: 18px; color: var(--text-secondary); }
.hero-note { margin-top: 26px; font-size: 13px; color: var(--text-tertiary); }
.cta { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-pressed); color: #fff; }
.btn-ghost { border: 1px solid var(--separator); color: var(--text-primary); background: var(--bg-elevated); }
.btn-ghost:hover { border-color: rgba(0, 0, 0, 0.18); color: var(--text-primary); }

/* ── 手机 mockup(纯 CSS,产品气质靠内容说话)── */
.phone {
  width: 300px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--separator);
  border-radius: 42px;
  padding: 14px;
  box-shadow: var(--shadow-soft);
}
.phone-notch {
  width: 96px; height: 22px;
  background: var(--bg-base);
  border-radius: 999px;
  margin: 2px auto 10px;
}
.phone-screen {
  background: var(--bg-base);
  border-radius: 30px;
  padding: 16px 12px 20px;
}
.ph-title { font-size: 13px; font-weight: 600; color: var(--text-tertiary); margin: 0 4px 10px; }
.ph-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  margin-bottom: 10px;
  border: 1px solid var(--separator);
}
.ph-row { display: flex; align-items: center; gap: 8px; margin-bottom: 7px; }
.ph-avatar {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 12px; font-weight: 600;
  display: inline-flex; align-items: center; justify-content: center;
  flex: none;
}
.ph-avatar.alt { background: var(--brand-tint); color: var(--brand); }
.ph-name { font-size: 13px; font-weight: 600; }
.ph-time { margin-left: auto; font-size: 11px; color: var(--text-tertiary); }
.ph-text { font-size: 13.5px; line-height: 1.55; }
.ph-chip {
  margin-top: 9px;
  display: inline-block;
  font-size: 11px;
  color: var(--brand);
  background: var(--brand-tint);
  border-radius: 999px;
  padding: 3px 10px;
}
.ph-media { margin-top: 9px; display: flex; gap: 6px; }
.ph-media span {
  width: 64px; height: 48px;
  border-radius: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--separator);
}
.ph-check { margin-top: 9px; font-size: 12.5px; display: grid; grid-template-columns: 14px 1fr; gap: 6px 8px; align-items: center; }
.ph-check i {
  width: 14px; height: 14px;
  border: 1.6px solid var(--text-tertiary);
  border-radius: 4px;
  display: inline-block;
}
.ph-check i.on { background: var(--text-secondary); border-color: var(--text-secondary); position: relative; }
.ph-check i.on::after {
  content: ""; position: absolute; left: 3.4px; top: 0.6px;
  width: 4px; height: 7.5px;
  border: solid #fff; border-width: 0 1.8px 1.8px 0;
  transform: rotate(45deg);
}
.ph-check s { color: var(--text-tertiary); }
.ph-check em { font-style: normal; }

/* ── 分节 ── */
.section { padding: 84px 0; }
.section-tint { background: var(--bg-elevated); border-top: 1px solid var(--separator); border-bottom: 1px solid var(--separator); }
.sec-head { text-align: center; max-width: 720px; margin: 0 auto 44px; }
.section h2 { font-size: 34px; font-weight: 700; line-height: 1.3; letter-spacing: -0.3px; }
.lead { margin-top: 14px; color: var(--text-secondary); font-size: 16.5px; }

/* 四张功能卡 */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--separator);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
}
.card h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.card p { font-size: 14px; color: var(--text-secondary); }

/* 左右分栏 */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split.rev .split-copy { order: 2; }
.split.rev .split-visual { order: 1; }
.split h2 { font-size: 32px; }
.ticks { margin-top: 22px; list-style: none; }
.ticks li {
  position: relative;
  padding: 8px 0 8px 26px;
  color: var(--text-secondary);
  font-size: 15px;
}
.ticks li::before {
  content: ""; position: absolute; left: 2px; top: 15px;
  width: 5px; height: 9px;
  border: solid var(--brand); border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* 在场墙 mockup */
.wall {
  background: var(--bg-base);
  border: 1px solid var(--separator);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow-soft);
  max-width: 380px;
  margin: 0 auto;
}
.wall-head { font-size: 13px; font-weight: 600; color: var(--text-tertiary); margin-bottom: 6px; }
.wall-row { display: flex; gap: 10px; align-items: flex-start; padding: 10px 0; border-top: 1px solid var(--separator); }
.wall-row:first-of-type { border-top: 0; }
.wall-row b { font-size: 13.5px; display: block; }
.wall-row p { font-size: 13px; color: var(--text-secondary); }
.wall-foot { margin-top: 8px; font-size: 12px; color: var(--text-tertiary); }

/* 一起做事 mockup */
.matterbox {
  background: var(--bg-elevated);
  border: 1px solid var(--separator);
  border-radius: var(--radius-lg);
  padding: 10px 18px;
  box-shadow: var(--shadow-soft);
  max-width: 380px;
  margin: 0 auto;
}
.mb-row { display: flex; align-items: center; gap: 12px; padding: 15px 0; border-top: 1px solid var(--separator); }
.mb-row:first-child { border-top: 0; }
.mb-pill {
  flex: none;
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border-radius: 999px;
  padding: 3px 10px;
}
.mb-row b { font-size: 14.5px; display: block; }
.mb-row p { font-size: 12.5px; color: var(--text-tertiary); }
.mb-live { width: 7px; height: 7px; border-radius: 50%; background: transparent; margin-left: auto; flex: none; }
.mb-live.on { background: var(--brand); box-shadow: 0 0 0 4px var(--brand-tint); }

/* 跨端示意 */
.devices { display: flex; justify-content: center; align-items: flex-end; gap: 28px; }
.dev { border: 1px solid var(--separator); background: var(--bg-elevated); box-shadow: var(--shadow-soft); }
.dev-pc { width: 420px; border-radius: 14px; }
.dev-bar { display: flex; gap: 5px; padding: 10px 12px; border-bottom: 1px solid var(--separator); }
.dev-bar i { width: 8px; height: 8px; border-radius: 50%; background: var(--bg-secondary); border: 1px solid var(--separator); }
.dev-body { padding: 18px 16px 22px; display: grid; gap: 10px; }
.dev-body span { height: 12px; border-radius: 6px; background: var(--bg-secondary); display: block; }
.dev-body span.short { width: 60%; }
.dev-phone { width: 96px; border-radius: 18px; padding-top: 12px; }
.dev-phone .dev-body { padding: 6px 10px 16px; }

/* ── 下载 ── */
.download { text-align: center; }
.dl-groups { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.dl-group {
  background: var(--bg-elevated);
  border: 1px solid var(--separator);
  border-radius: var(--radius-lg);
  padding: 26px 30px;
  min-width: 300px;
  text-align: left;
}
.dl-title { font-size: 16px; font-weight: 600; }
.dl-note { margin: 4px 0 16px; font-size: 13px; color: var(--text-tertiary); }
.dl-list { display: grid; gap: 10px; }
.dl-btn {
  display: flex; align-items: center; justify-content: space-between;
  border: 1px solid var(--separator);
  border-radius: var(--radius-md);
  padding: 13px 16px;
  color: var(--text-primary);
  background: var(--bg-base);
  transition: border-color 0.15s ease, background 0.15s ease;
}
.dl-btn:not(.is-soon):hover { border-color: var(--brand); background: var(--brand-tint); }
.dl-name { font-size: 15px; font-weight: 600; color: var(--text-primary); }
.dl-state { font-size: 12.5px; font-weight: 500; color: var(--brand); }
.dl-btn.is-soon { cursor: default; }
.dl-btn.is-soon .dl-state { color: var(--text-tertiary); }
.dl-btn.is-soon:hover { border-color: var(--separator); background: var(--bg-base); }

/* ── 页脚 ── */
.footer { border-top: 1px solid var(--separator); padding: 44px 0 52px; background: var(--bg-elevated); }
.footer .row { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
.footer .col h4 { font-size: 13px; color: var(--text-tertiary); font-weight: 600; margin-bottom: 12px; letter-spacing: 0.3px; }
.footer .col a, .footer .col p { display: block; font-size: 14px; color: var(--text-secondary); margin-bottom: 8px; }
.footer .col a:hover { color: var(--text-primary); }
.footer .legal { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--separator);
  font-size: 13px; color: var(--text-tertiary); line-height: 1.8; }
.footer .legal a { color: var(--text-tertiary); }

/* ── 法律条款页(privacy.html / terms.html 复用)── */
.doc { background: var(--bg-elevated); }
.doc .paper { max-width: 760px; margin: 0 auto; padding: 56px 24px 80px; }
.doc h1 { font-size: 30px; font-weight: 700; }
.doc .meta { color: var(--text-tertiary); font-size: 14px; margin-top: 10px; }
.doc h2 { font-size: 19px; font-weight: 600; margin-top: 36px; }
.doc p, .doc li { color: var(--text-secondary); font-size: 15px; margin-top: 12px; }
.doc ul { margin-top: 8px; padding-left: 22px; }
.doc li { margin-top: 8px; }
.doc .back { display: inline-block; margin-bottom: 28px; font-size: 14px; }
.doc strong { color: var(--text-primary); font-weight: 600; }

/* ── 响应式 ── */
@media (max-width: 900px) {
  .hero { padding-top: 56px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; text-align: center; }
  .hero h1 { font-size: 38px; }
  .pc-br { display: none; }
  .cta { justify-content: center; }
  .cards { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; gap: 36px; }
  .split.rev .split-copy { order: 1; }
  .split.rev .split-visual { order: 2; }
  .dev-pc { width: 300px; }
  .nav-links { gap: 16px; font-size: 14px; }
}
@media (max-width: 520px) {
  .cards { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
  .section { padding: 60px 0; }
  .section h2 { font-size: 26px; }
  .footer .row { gap: 32px; }
  .nav-links a:nth-child(3) { display: none; }
}