/* 瑞博启阅官网。配色取自 logo 的粉彩渐变 + App 里的奶油底和陶土色。
   不引外部字体(国内访问 Google Fonts 不稳定),用系统中文字体栈。 */
:root {
  --bg: #fbf7ef;
  --paper: #fffdf8;
  --ink: #33291f;
  --ink-2: #6b5d4f;
  --line: rgba(51, 41, 31, .1);
  --accent: #c67139;
  --leaf: #6fae6a;
  --mint: #8fd6c6;
  --pink: #f3b3c0;
  --lemon: #f1e39a;
  --radius: 22px;
  --shadow: 0 1px 2px rgba(51, 41, 31, .04), 0 10px 30px rgba(51, 41, 31, .06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.75 -apple-system, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei",
        "Noto Sans CJK SC", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1080px; margin: 0 auto; padding-inline: 20px; }

/* ---- 顶栏 ---- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(251, 247, 239, .88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; font-size: 18px; }
.brand:hover { text-decoration: none; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.nav nav { margin-left: auto; display: flex; gap: 22px; flex-wrap: wrap; }
.nav nav a { color: var(--ink-2); font-size: 15px; }
.nav nav a:hover { color: var(--ink); text-decoration: none; }

/* ---- 首屏 ---- */
.hero { padding-block: 64px 40px; text-align: center; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -40% -20% auto; height: 120%;
  background:
    radial-gradient(40% 45% at 22% 40%, rgba(243, 179, 192, .35), transparent 70%),
    radial-gradient(38% 42% at 78% 35%, rgba(143, 214, 198, .35), transparent 70%),
    radial-gradient(30% 35% at 50% 70%, rgba(241, 227, 154, .35), transparent 70%);
  z-index: -1;
}
.hero .logo { width: min(340px, 76vw); margin: 0 auto 8px; }
.hero h1 { font-size: clamp(28px, 5vw, 42px); line-height: 1.3; margin: 18px 0 8px; letter-spacing: .02em; }
.hero .en { color: var(--ink-2); font-size: 15px; letter-spacing: .06em; margin: 0 0 18px; }
.hero .lead { max-width: 640px; margin: 0 auto; color: var(--ink-2); font-size: 17px; }
.pill {
  display: inline-block; margin-top: 26px; padding: 10px 22px; border-radius: 999px;
  background: var(--paper); border: 1px solid var(--line); box-shadow: var(--shadow);
  color: var(--ink-2); font-size: 15px;
}

/* ---- 区块 ---- */
section { padding-block: 44px; }
.sec-title { text-align: center; margin-bottom: 30px; }
.sec-title h2 { font-size: clamp(22px, 3.4vw, 30px); margin: 0 0 6px; }
.sec-title p { margin: 0; color: var(--ink-2); }

/* 6 张功能卡:固定 3 列(桌面 3+3、平板 2+2+2、手机单列),auto-fit 会排成 4+2 */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }
.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
.card h3 { margin: 12px 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--ink-2); font-size: 15px; }
.dot { width: 44px; height: 44px; border-radius: 14px; display: grid; place-items: center; font-size: 22px; }
.d1 { background: #fde4ea; } .d2 { background: #e2f4ee; } .d3 { background: #fbf3cf; }
.d4 { background: #e6f1dc; } .d5 { background: #f7e1d2; } .d6 { background: #e5eef6; }

.about { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.about dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 10px 18px; }
.about dt { color: var(--ink-2); }
.about dd { margin: 0; }

/* ---- 文档页(隐私政策/用户协议) ---- */
.doc { max-width: 820px; margin: 0 auto; padding-block: 40px 60px; }
.doc h1 { font-size: clamp(26px, 4vw, 34px); margin: 0 0 6px; }
.doc .meta { color: var(--ink-2); margin: 0 0 28px; font-size: 14px; }
.doc h2 { font-size: 20px; margin: 34px 0 10px; padding-top: 6px; }
.doc h3 { font-size: 17px; margin: 22px 0 8px; }
.doc p, .doc li { color: #463a2e; }
.doc table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; }
.doc th, .doc td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
.doc th { background: var(--paper); }
.table-scroll { overflow-x: auto; }
.note {
  background: #fff5e6; border: 1px solid #f0d9b5; border-radius: 14px;
  padding: 12px 16px; color: #7a5423; font-size: 14px; margin-bottom: 24px;
}

/* ---- 页脚 ---- */
footer { border-top: 1px solid var(--line); padding-block: 28px 36px; color: var(--ink-2); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 24px; justify-content: space-between; }
footer .links { display: flex; flex-wrap: wrap; gap: 18px; }
footer a { color: var(--ink-2); }

@media (max-width: 720px) {
  .nav nav { display: none; }
  .about { grid-template-columns: 1fr; }
  .hero { padding-block: 44px 28px; }
}