/* 禧瑞官网样式（纯静态，无外部依赖） */
:root {
  --brand: #e8100a;
  --brand-2: #ff5a4e;
  --brand-dark: #b80d08;
  --ink: #1f2937;
  --ink-2: #4b5563;
  --ink-3: #9ca3af;
  --line: #eceef2;
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --bg-warm: #fff5f4;
  --radius: 16px;
  --max: 1160px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ===== 导航 ===== */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 22px; letter-spacing: 2px; }
.brand img { width: 40px; height: 40px; border-radius: 10px; }
.nav ul { display: flex; gap: 32px; list-style: none; font-size: 15px; color: var(--ink-2); }
.nav ul a:hover { color: var(--brand); }

/* ===== 首屏 ===== */
.hero {
  background: linear-gradient(160deg, var(--bg-warm) 0%, #ffffff 55%);
  overflow: hidden;
}
.hero .wrap {
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center;
  padding-top: 72px; padding-bottom: 72px;
}
.hero .tag {
  display: inline-block; padding: 6px 14px; border-radius: 999px;
  background: #ffe4e1; color: var(--brand-dark); font-size: 14px; font-weight: 600;
}
.hero h1 { font-size: 56px; line-height: 1.2; margin: 20px 0 12px; letter-spacing: 2px; }
.hero h1 em { font-style: normal; color: var(--brand); }
.hero .lead { font-size: 20px; color: var(--ink-2); max-width: 560px; }
.hero .cta { display: flex; gap: 16px; margin-top: 36px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 50px; padding: 0 28px; border-radius: 999px; font-size: 16px; font-weight: 600;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--brand-2), var(--brand));
  color: #fff; box-shadow: 0 10px 24px rgba(232, 16, 10, .25);
}
.btn-ghost { border: 1.5px solid #f3c4c1; color: var(--brand-dark); background: #fff; }
.hero .stats { display: flex; gap: 40px; margin-top: 44px; }
.hero .stats b { display: block; font-size: 26px; color: var(--ink); }
.hero .stats span { font-size: 14px; color: var(--ink-3); }
.hero .visual { display: flex; justify-content: center; }

/* 手机样机 */
.phone {
  width: 300px; border-radius: 44px; padding: 10px; background: #111;
  box-shadow: 0 30px 70px rgba(80, 0, 0, .22);
}
.phone img { border-radius: 36px; }
.phone.sm { width: 230px; border-radius: 36px; padding: 8px; }
.phone.sm img { border-radius: 29px; }

/* ===== 通用区块 ===== */
section { padding: 88px 0; }
section.soft { background: var(--bg-soft); }
.sec-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.sec-head .eyebrow { color: var(--brand); font-weight: 700; letter-spacing: 3px; font-size: 14px; }
.sec-head h2 { font-size: 36px; margin: 8px 0 12px; letter-spacing: 1px; }
.sec-head p { color: var(--ink-2); font-size: 17px; }

/* 功能卡片 */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover { box-shadow: 0 14px 36px rgba(17, 24, 39, .08); transform: translateY(-2px); }
.card .ic {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--brand-2), var(--brand)); color: #fff;
  font-size: 22px; font-weight: 700; margin-bottom: 18px;
}
.card h3 { font-size: 20px; margin-bottom: 8px; }
.card p { color: var(--ink-2); font-size: 15px; }

/* 产品截图 */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px 24px; justify-items: center; }
.shot { text-align: center; }
.shot .phone { margin: 0 auto; }
.shot h4 { font-size: 18px; margin-top: 22px; }
.shot p { font-size: 14px; color: var(--ink-3); margin-top: 4px; }

/* 应用介绍 */
.intro { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: center; }
.intro .text h3 { font-size: 26px; margin-bottom: 16px; }
.intro .text p { color: var(--ink-2); margin-bottom: 14px; font-size: 16px; }
.flow { list-style: none; counter-reset: s; margin-top: 24px; display: grid; gap: 12px; }
.flow li {
  counter-increment: s; position: relative; padding: 14px 18px 14px 64px;
  background: #fff; border: 1px solid var(--line); border-radius: 12px; font-size: 15px;
}
.flow li::before {
  content: counter(s); position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
  width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center;
  background: var(--brand); color: #fff; font-weight: 700; font-size: 15px;
}
.flow li b { margin-right: 8px; }
.flow li span { color: var(--ink-2); }

/* 下载 */
.download {
  background: linear-gradient(135deg, #ff6a4d 0%, #e8100a 60%, #c40000 100%);
  color: #fff; border-radius: 28px; padding: 56px; display: flex; align-items: center;
  justify-content: space-between; gap: 32px; flex-wrap: wrap;
}
.download h2 { font-size: 34px; letter-spacing: 1px; }
.download p { opacity: .9; margin-top: 8px; font-size: 17px; }
.download .stores { display: flex; gap: 16px; flex-wrap: wrap; }
.store {
  display: flex; align-items: center; gap: 12px; background: rgba(255, 255, 255, .14);
  border: 1px solid rgba(255, 255, 255, .35); border-radius: 14px; padding: 12px 22px; min-width: 210px;
}
.store b { display: block; font-size: 17px; }
.store small { opacity: .85; font-size: 13px; }
.store .os {
  width: 38px; height: 38px; border-radius: 10px; background: #fff; color: var(--brand);
  display: grid; place-items: center; font-weight: 800; font-size: 14px;
}

/* 关于 / 联系 */
.about { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.about .card p + p { margin-top: 10px; }
.contact { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.contact .card { text-align: center; }
.contact .card .val { font-size: 20px; font-weight: 700; color: var(--ink); margin-top: 6px; word-break: break-all; }
.contact .card .ic { margin: 0 auto 16px; }

/* ===== 页脚 ===== */
footer { background: #111827; color: #9ca3af; padding: 48px 0 32px; font-size: 14px; }
footer .top { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; padding-bottom: 28px; border-bottom: 1px solid #1f2937; }
footer .brand { color: #fff; }
footer .links { display: flex; gap: 28px; flex-wrap: wrap; align-items: center; }
footer .links a:hover, footer .beian a:hover { color: #fff; }
footer .beian { display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; padding-top: 24px; text-align: center; }

/* ===== 协议页 ===== */
.doc { max-width: 860px; margin: 0 auto; padding: 56px 24px 88px; }
.doc h1 { font-size: 34px; margin-bottom: 8px; }
.doc .meta { color: var(--ink-3); font-size: 14px; margin-bottom: 36px; }
.doc h2 { font-size: 21px; margin: 36px 0 12px; padding-left: 12px; border-left: 4px solid var(--brand); }
.doc h3 { font-size: 17px; margin: 20px 0 8px; }
.doc p, .doc li { color: var(--ink-2); font-size: 15.5px; }
.doc p { margin-bottom: 10px; }
.doc ul, .doc ol { padding-left: 22px; margin-bottom: 12px; }
.doc li { margin-bottom: 6px; }
.doc table { width: 100%; border-collapse: collapse; margin: 12px 0 18px; font-size: 14.5px; }
.doc th, .doc td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; color: var(--ink-2); }
.doc th { background: var(--bg-soft); color: var(--ink); }
.doc .notice { background: var(--bg-warm); border: 1px solid #fbd5d2; border-radius: 12px; padding: 16px 18px; margin-bottom: 24px; }

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .hero .wrap, .intro { grid-template-columns: 1fr; }
  .hero h1 { font-size: 42px; }
  .features, .gallery, .contact { grid-template-columns: repeat(2, 1fr); }
  .about { grid-template-columns: 1fr; }
  .nav ul { display: none; }
}
@media (max-width: 600px) {
  .wrap { padding: 0 16px; }
  section { padding: 64px 0; }
  .hero .wrap { padding-top: 44px; padding-bottom: 52px; }
  .hero h1 { font-size: 34px; }
  .hero .lead { font-size: 17px; }
  .hero .stats { gap: 20px; }
  .hero .stats b { font-size: 19px; white-space: nowrap; }
  .hero .stats span { font-size: 13px; }
  .sec-head h2 { font-size: 28px; }
  .features, .gallery, .contact { grid-template-columns: 1fr; }
  .download { padding: 36px 24px; }
  .download h2 { font-size: 26px; }
  .phone { width: 260px; }
  .doc { padding: 40px 16px 64px; }
  .doc h1 { font-size: 28px; }
  .doc table { display: block; overflow-x: auto; }
}