/* ==================================================================
   Seek 官网 · 设计令牌
   与 App 内部同一套：主色紫 #6A4BF0、交互蓝 #0A6CE8、品牌渐变
   ================================================================== */
:root {
  --purple: #6a4bf0;
  --purple-dark: #5b45d6;
  --blue: #0a6ce8;
  --ink: #14161c;
  --ink-2: #3a3f4b;
  --gray: #6b6b70;
  --gray-2: #8a8f99;
  --line: #eceef2;
  --bg: #ffffff;
  --bg-soft: #f7f8fb;
  --radius: 20px;
  --shadow-sm: 0 2px 8px rgba(20, 22, 28, 0.05);
  --shadow-md: 0 12px 32px -12px rgba(20, 22, 28, 0.18);
  --shadow-lg: 0 30px 70px -30px rgba(106, 75, 240, 0.45);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }

.wrap {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------------- 顶栏 ---------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  background: rgba(255, 255, 255, 0.82);
  border-bottom: 0.5px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.6px;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(140deg, #8a6bff, #6a4bf0 60%, #b44bf0);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 17px;
  font-weight: 900;
  box-shadow: 0 6px 16px -6px rgba(106, 75, 240, 0.8);
}

.nav-links {
  display: flex;
  gap: 26px;
  margin-left: auto;
  font-size: 14.5px;
  color: var(--gray);
}

.nav-links a:hover { color: var(--ink); }

.nav-cta {
  margin-left: 8px;
  height: 38px;
  padding: 0 18px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(120deg, #5b45d6, #7c5cff);
  box-shadow: 0 10px 22px -10px rgba(106, 75, 240, 0.9);
  transition: transform 0.2s var(--ease);
}

.nav-cta:hover { transform: translateY(-1px); }

/* ---------------- Hero ---------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 84px 0 40px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 620px;
  background:
    radial-gradient(60% 60% at 18% 20%, rgba(106, 75, 240, 0.16), transparent 70%),
    radial-gradient(50% 50% at 82% 10%, rgba(255, 107, 154, 0.14), transparent 70%),
    radial-gradient(60% 60% at 60% 0%, rgba(37, 99, 235, 0.08), transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 48px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  background: #f1edff;
  color: var(--purple-dark);
  font-size: 12.5px;
  font-weight: 600;
}

.dot-live {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #30d158;
  box-shadow: 0 0 0 3px rgba(48, 209, 88, 0.18);
}

h1 {
  margin: 18px 0 0;
  font-size: 54px;
  line-height: 1.12;
  letter-spacing: -2px;
  font-weight: 800;
}

.grad-text {
  background: linear-gradient(100deg, #6a4bf0, #b44bf0 45%, #ff6b9a 78%, #ff9a3c);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  margin: 20px 0 0;
  font-size: 17px;
  color: var(--gray);
  max-width: 460px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.btn {
  height: 52px;
  padding: 0 24px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15.5px;
  font-weight: 650;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
  border: none;
  cursor: pointer;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, #5b45d6, #7c5cff 60%, #8b5cf6);
  box-shadow: 0 16px 34px -14px rgba(106, 75, 240, 0.9);
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 22px 40px -16px rgba(106, 75, 240, 1); }

.btn-ghost {
  color: var(--ink);
  background: #fff;
  box-shadow: 0 0 0 1px var(--line), var(--shadow-sm);
}

.btn-ghost:hover { transform: translateY(-2px); box-shadow: 0 0 0 1px #dcd9ea, var(--shadow-md); }

.btn small { font-weight: 500; opacity: 0.75; font-size: 12.5px; }

.hero-meta {
  margin-top: 18px;
  font-size: 12.5px;
  color: var(--gray-2);
}

/* 手机模型 */
.phone-stage {
  position: relative;
  display: flex;
  justify-content: center;
}

.phone {
  position: relative;
  width: 300px;
  border-radius: 44px;
  padding: 10px;
  background: linear-gradient(160deg, #1b1f2a, #0d1017);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255, 255, 255, 0.06) inset;
}

.phone img {
  display: block;
  width: 100%;
  border-radius: 36px;
}

.phone::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 18px;
  transform: translateX(-50%);
  width: 92px;
  height: 22px;
  border-radius: 12px;
  background: #0d1017;
}

/* ---------------- 数据条 ---------------- */
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  padding: 34px 0;
  border-top: 0.5px solid var(--line);
  border-bottom: 0.5px solid var(--line);
  margin-top: 40px;
}

.stat b {
  display: block;
  font-size: 30px;
  letter-spacing: -1px;
  font-weight: 800;
}

.stat span { font-size: 13px; color: var(--gray-2); }

/* ---------------- 通用区块 ---------------- */
section { padding: 84px 0; }

.section-head { max-width: 620px; }

.section-head h2 {
  margin: 0;
  font-size: 36px;
  letter-spacing: -1.2px;
  line-height: 1.2;
  font-weight: 800;
}

.section-head p {
  margin: 14px 0 0;
  color: var(--gray);
  font-size: 15.5px;
}

/* 功能卡 */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 44px;
}

.card {
  padding: 26px 24px;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 0 0 1px var(--line), var(--shadow-sm);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.card:hover { transform: translateY(-3px); box-shadow: 0 0 0 1px #e2def5, var(--shadow-md); }

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 20px;
  margin-bottom: 16px;
  background: #f1edff;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.card p { margin: 0; font-size: 14px; color: var(--gray); line-height: 1.65; }

/* 截图画廊 */
.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  margin-top: 48px;
  align-items: start;
}

.gallery figure { margin: 0; }

.gallery .frame {
  border-radius: 26px;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--line), var(--shadow-md);
  background: #fff;
}

.gallery img { display: block; width: 100%; }

.gallery figcaption {
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--gray);
  text-align: center;
}

/* 下载区 */
.download {
  background: var(--bg-soft);
  border-radius: 32px;
  padding: 54px 44px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
}

.download h2 { margin: 0; font-size: 32px; letter-spacing: -1px; font-weight: 800; }

.download p { margin: 12px 0 0; color: var(--gray); font-size: 15px; }

.dl-list { display: flex; flex-direction: column; gap: 12px; }

.dl-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 0 0 1px var(--line);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.dl-item:hover { transform: translateY(-2px); box-shadow: 0 0 0 1px #ddd7f7, var(--shadow-md); }

.dl-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: #f1edff;
  color: var(--purple-dark);
  font-weight: 700;
  font-size: 15px;
  flex: none;
}

.dl-text b { display: block; font-size: 15px; }
.dl-text span { font-size: 12.5px; color: var(--gray-2); }

.dl-arrow { margin-left: auto; color: var(--gray-2); font-size: 18px; }

/* 页脚 */
footer {
  border-top: 0.5px solid var(--line);
  padding: 48px 0 60px;
  margin-top: 40px;
}

.foot-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: space-between;
  align-items: flex-start;
}

.foot-links { display: flex; flex-wrap: wrap; gap: 26px; font-size: 13.5px; color: var(--gray); }

.foot-links a:hover { color: var(--ink); }

.copy { font-size: 12.5px; color: var(--gray-2); line-height: 1.9; }

/* ---------------- 文档页（隐私/协议） ---------------- */
.doc { padding: 56px 0 80px; }

.doc h1 { font-size: 34px; letter-spacing: -1px; margin: 0 0 8px; }

.doc .updated { color: var(--gray-2); font-size: 13px; margin-bottom: 34px; }

.doc h2 {
  font-size: 19px;
  margin: 36px 0 10px;
  letter-spacing: -0.3px;
}

.doc p, .doc li { font-size: 15px; color: var(--ink-2); line-height: 1.9; }

.doc ul { padding-left: 20px; }

.doc .note {
  margin-top: 40px;
  padding: 18px 20px;
  border-radius: 14px;
  background: var(--bg-soft);
  font-size: 13.5px;
  color: var(--gray);
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 920px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  h1 { font-size: 42px; }
  .phone { width: 260px; }
  .features { grid-template-columns: 1fr 1fr; }
  .gallery { grid-template-columns: 1fr 1fr; }
  .download { grid-template-columns: 1fr; padding: 36px 26px; }
  .nav-links { display: none; }
}

@media (max-width: 600px) {
  .hero { padding-top: 48px; }
  h1 { font-size: 34px; letter-spacing: -1.2px; }
  .lede { font-size: 15.5px; }
  section { padding: 56px 0; }
  .section-head h2 { font-size: 27px; }
  .features { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; gap: 22px; }
  .stats { gap: 26px; }
  .stat b { font-size: 24px; }
  .btn { width: 100%; justify-content: center; }
}