/* ============================================================
   好读书官网 · 全站样式
   设计令牌与 UI_v3 原型 / App（theme.scss）同源：
   纸面底色 + 竹青主色 + 楷体点缀 + 田字格纹理
   纯静态、无外部依赖，可直接拷贝至服务器 Nginx 根目录
   ============================================================ */
:root {
  --paper: #f6f1e6;
  --paper2: #fffdf7;
  --ink: #2c2620;
  --ink2: #6f6455;
  --ink3: #a79b87;
  --line: #eae1cf;
  --green: #2f9e77;
  --green-d: #1f7a5b;
  --green-l: #37ae85;
  --green-soft: #e2f1e9;
  --cinnabar: #e05b2e;
  --cinnabar-d: #c44a22;
  --cinnabar-soft: #fbeae1;
  --gold: #efa92e;
  --gold-d: #c98a12;
  --gold-soft: #fbf1d8;
  --blue: #3e7cb1;
  --blue-soft: #e7eff7;
  --grid: #d9cdb6;
  --glow: 31, 122, 91;
  --shadow: 0 12px 32px rgba(96, 74, 38, 0.12);
  --shadow-s: 0 4px 16px rgba(96, 74, 38, 0.08);
  --kai: "Kaiti SC", "STKaiti", "KaiTi", "楷体", serif;
  --ui: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--ui);
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
::selection { background: var(--green-soft); }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
main { flex: 1; }

/* ---------- 顶部导航 ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(246, 241, 230, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-in { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-logo {
  width: 42px; height: 42px; border-radius: 13px; position: relative;
  background: linear-gradient(140deg, var(--green-l), var(--green-d));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--kai); font-size: 24px; color: #fff;
  box-shadow: 0 6px 14px rgba(var(--glow), 0.3);
}
.brand-logo::after {
  content: ""; position: absolute; inset: 4px; border-radius: 9px;
  border: 1px dashed rgba(255, 255, 255, 0.5);
}
.brand-tx { display: flex; flex-direction: column; line-height: 1.3; }
.brand-tx b { font-size: 17px; letter-spacing: 3px; }
.brand-tx i { font-style: normal; font-size: 11px; color: var(--ink3); letter-spacing: 1px; }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  padding: 9px 16px; border-radius: 999px;
  font-size: 14.5px; font-weight: 500; color: var(--ink2);
  transition: background 0.2s, color 0.2s;
}
.nav-links a:hover { background: var(--green-soft); color: var(--green-d); }
.nav-links a.on { background: var(--ink); color: var(--paper); font-weight: 600; }
.nav-toggle {
  display: none; margin-left: auto;
  width: 40px; height: 40px; border-radius: 12px; border: 1.5px solid var(--line);
  background: var(--paper2); color: var(--ink2); font-size: 17px; cursor: pointer;
  align-items: center; justify-content: center; font-family: inherit;
}

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: radial-gradient(1100px 620px at 22% -10%, #f4eddd, #e9dfcb);
  border-bottom: 1px solid var(--line);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity: 0.32;
  -webkit-mask-image: radial-gradient(640px 420px at 50% 32%, #000, transparent 76%);
  mask-image: radial-gradient(640px 420px at 50% 32%, #000, transparent 76%);
}
.hero-in { position: relative; padding: 84px 24px 78px; text-align: center; }
.hero-chip {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--paper2); border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 16px; font-size: 12.5px; color: var(--ink2); letter-spacing: 1px;
  box-shadow: var(--shadow-s);
}
.hero-chip i { font-style: normal; color: var(--green-d); font-weight: 700; }
.hero-logo {
  width: 92px; height: 92px; border-radius: 28px; margin: 30px auto 20px;
  background: linear-gradient(140deg, var(--green-l), var(--green-d));
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 16px 36px rgba(var(--glow), 0.35); position: relative;
}
.hero-logo::after {
  content: ""; position: absolute; inset: 6px; border-radius: 21px;
  border: 1.5px dashed rgba(255, 255, 255, 0.45);
}
.hero-logo span { font-family: var(--kai); font-size: 48px; color: #fff; }
.hero h1 { font-size: 50px; letter-spacing: 16px; text-indent: 16px; font-weight: 800; }
.hero-slogan {
  margin-top: 14px; font-family: var(--kai); font-size: 20px;
  color: var(--ink2); letter-spacing: 5px;
}
.hero-lead {
  max-width: 660px; margin: 22px auto 0;
  font-size: 15.5px; color: var(--ink2); line-height: 2.05;
}
.hero-lead b { color: var(--green-d); }
.hero-note {
  margin-top: 24px; display: inline-flex; align-items: center; gap: 8px;
  background: var(--cinnabar-soft); color: var(--cinnabar-d);
  border-radius: 999px; padding: 9px 20px;
  font-size: 13px; font-weight: 600; letter-spacing: 0.5px;
}
.hero-cta { margin-top: 30px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-verse {
  position: absolute; right: 7%; top: 50%; transform: translateY(-50%);
  writing-mode: vertical-rl; font-family: var(--kai);
  font-size: 21px; letter-spacing: 12px; color: var(--ink3); opacity: 0.5;
}
.hero-verse.l { right: auto; left: 7%; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; font-size: 15px; border-radius: 999px; padding: 13px 30px;
  transition: transform 0.15s, box-shadow 0.2s;
}
.btn:active { transform: scale(0.96); }
.btn-primary {
  background: linear-gradient(135deg, var(--green-l), var(--green-d));
  color: #fff; box-shadow: 0 8px 20px rgba(var(--glow), 0.35);
}
.btn-ghost { background: var(--paper2); border: 1.5px solid var(--line); color: var(--ink2); }
.btn-ghost:hover { border-color: var(--green); color: var(--green-d); }

/* ---------- 区块 ---------- */
.sec { padding: 72px 0 6px; }
.sec-head { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; }
.sec-no {
  width: 36px; height: 36px; border-radius: 11px; flex-shrink: 0;
  background: var(--ink); color: var(--paper);
  font-family: var(--kai); font-size: 16px;
  display: flex; align-items: center; justify-content: center;
}
.sec-head h2 { font-size: 26px; font-weight: 800; letter-spacing: 2px; }
.sec-sub { color: var(--ink2); font-size: 14.5px; line-height: 1.95; max-width: 780px; margin-bottom: 30px; }
.sec-sub b { color: var(--green-d); }

/* ---------- 功能卡片 ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 20px; }
.fcard {
  background: var(--paper2); border-radius: 22px; box-shadow: var(--shadow-s);
  padding: 26px 22px; transition: transform 0.25s, box-shadow 0.25s;
}
.fcard:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.fcard .fi {
  width: 52px; height: 52px; border-radius: 16px; margin-bottom: 16px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--kai); font-size: 26px;
}
.fi.g { background: var(--green-soft); color: var(--green-d); }
.fi.o { background: var(--gold-soft); color: var(--gold-d); }
.fi.c { background: var(--cinnabar-soft); color: var(--cinnabar-d); }
.fi.b { background: var(--blue-soft); color: var(--blue); }
.fcard h3 { font-size: 17px; letter-spacing: 1px; margin-bottom: 8px; }
.fcard p { font-size: 13.5px; color: var(--ink2); line-height: 1.9; }

/* ---------- 双栏卡 ---------- */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.dcard { background: var(--paper2); border-radius: 22px; box-shadow: var(--shadow-s); padding: 28px; }
.dcard h3 { font-size: 17px; letter-spacing: 1px; display: flex; align-items: center; gap: 10px; }
.dcard h3::before {
  content: ""; width: 5px; height: 18px; border-radius: 3px;
  background: linear-gradient(var(--green), var(--green-d));
}
.dcard.warm h3::before { background: linear-gradient(var(--gold), var(--gold-d)); }
.dcard > p { font-size: 13.5px; color: var(--ink2); margin-top: 8px; line-height: 1.9; }
.dlist { margin-top: 12px; }
.dlist li {
  position: relative; padding: 10px 0 10px 24px;
  font-size: 14px; color: var(--ink2); line-height: 1.8;
  border-bottom: 1px dashed var(--line);
}
.dlist li:last-child { border-bottom: none; }
.dlist li::before {
  content: ""; position: absolute; left: 4px; top: 18px;
  width: 8px; height: 8px; border-radius: 50%; background: var(--green);
}
.dlist li b { color: var(--ink); }

/* ---------- 深色横带 ---------- */
.band {
  margin: 76px 0 8px; border-radius: 26px; overflow: hidden;
  background: linear-gradient(160deg, #3a3128, #211d19); color: #f2e7ce;
  padding: 44px 40px; position: relative;
}
.band::after {
  content: "读"; position: absolute; right: 34px; top: 50%;
  transform: translateY(-50%);
  font-family: var(--kai); font-size: 120px; color: rgba(246, 241, 230, 0.06);
}
.band h3 { font-size: 21px; letter-spacing: 2px; margin-bottom: 10px; }
.band p { font-size: 14px; line-height: 2; opacity: 0.82; max-width: 640px; }
.band a { color: var(--gold); font-weight: 700; }
.band a:hover { text-decoration: underline; }

/* ---------- 信息表（关于/联系） ---------- */
.kv-tbl { background: var(--paper2); border-radius: 22px; box-shadow: var(--shadow-s); overflow: hidden; }
.kv-row { display: flex; padding: 17px 24px; border-bottom: 1px solid var(--line); font-size: 14.5px; }
.kv-row:last-child { border-bottom: none; }
.kv-row .k { width: 160px; flex-shrink: 0; color: var(--ink3); }
.kv-row .v { color: var(--ink); font-weight: 600; word-break: break-all; }
.kv-row .v a { color: var(--green-d); }
.kv-row .v a:hover { text-decoration: underline; }

.co-lockup {
  display: flex;
  align-items: center;
  gap: 18px;
  margin: 4px 0 28px;
}
.co-lockup img {
  width: 72px;
  height: 72px;
  border-radius: 20px;
  box-shadow: 0 8px 20px rgba(31, 122, 91, 0.22);
}
.co-cn {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 10px;
  color: var(--ink);
  line-height: 1.15;
}
.co-en {
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 5px;
  color: var(--green-d);
  font-weight: 600;
}

/* ---------- 印章 ---------- */
.seal {
  display: inline-flex; align-items: center; justify-content: center;
  width: 74px; height: 74px; border-radius: 10px;
  background: linear-gradient(150deg, #ee6c3d, var(--cinnabar-d));
  color: #fff7e8; font-family: var(--kai); font-size: 26px; line-height: 1.15;
  text-align: center; letter-spacing: 2px;
  box-shadow: 0 10px 22px rgba(196, 74, 34, 0.3);
  transform: rotate(-4deg);
}

/* ---------- 页头（子页） ---------- */
.page-hero {
  background: radial-gradient(900px 480px at 30% -20%, #f4eddd, #eadfcc);
  border-bottom: 1px solid var(--line);
  padding: 60px 0 46px; text-align: center;
}
.page-hero .crumb { font-size: 12.5px; color: var(--ink3); letter-spacing: 1px; margin-bottom: 14px; }
.page-hero .crumb a:hover { color: var(--green-d); }
.page-hero h1 { font-size: 34px; letter-spacing: 6px; font-weight: 800; }
.page-hero .sub { margin-top: 12px; font-family: var(--kai); font-size: 16px; color: var(--ink2); letter-spacing: 2px; }

/* ---------- 协议文档页 ---------- */
.doc-grid { display: grid; grid-template-columns: 216px 1fr; gap: 28px; padding: 44px 0 24px; align-items: start; }
.doc-toc {
  position: sticky; top: 92px;
  background: var(--paper2); border-radius: 18px; box-shadow: var(--shadow-s);
  padding: 14px;
}
.doc-toc .tt { font-size: 12px; color: var(--ink3); letter-spacing: 2px; padding: 6px 12px 10px; }
.doc-toc a { display: block; padding: 9px 12px; border-radius: 10px; font-size: 13px; color: var(--ink2); }
.doc-toc a:hover { background: var(--green-soft); color: var(--green-d); }
.doc-toc a.cur { background: var(--ink); color: var(--paper); }
.doc-body {
  background: var(--paper2); border-radius: 24px; box-shadow: var(--shadow-s);
  padding: 42px 46px; min-width: 0;
}
.doc-body h2 {
  font-size: 18.5px; letter-spacing: 1px; margin: 36px 0 12px;
  padding-left: 14px; border-left: 5px solid var(--green); line-height: 1.4;
}
.doc-body h2:first-of-type { margin-top: 0; }
.doc-body p { font-size: 14.5px; color: var(--ink2); line-height: 2.05; margin-bottom: 10px; }
.doc-body ul { margin: 8px 0 16px; }
.doc-body li {
  position: relative; padding: 7px 0 7px 22px;
  font-size: 14px; color: var(--ink2); line-height: 1.95;
}
.doc-body li::before {
  content: ""; position: absolute; left: 3px; top: 17px;
  width: 7px; height: 7px; border-radius: 50%; background: var(--green);
}
.kv-def { border: 1px solid var(--line); border-radius: 16px; overflow: hidden; margin: 14px 0 20px; }
.kv-def .row { display: flex; font-size: 13.5px; border-bottom: 1px solid var(--line); }
.kv-def .row:last-child { border-bottom: none; }
.kv-def .k { width: 176px; flex-shrink: 0; background: var(--paper); padding: 12px 16px; color: var(--ink2); }
.kv-def .val { padding: 12px 16px; color: var(--ink); font-weight: 600; word-break: break-all; }
.kv-def .val a { color: var(--green-d); }
.kv-def .val a:hover { text-decoration: underline; }
.note {
  background: var(--gold-soft); color: var(--gold-d);
  border-radius: 14px; padding: 14px 18px;
  font-size: 13px; line-height: 1.95; margin: 14px 0;
}
.doc-related { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }
.doc-related a {
  padding: 10px 18px; border-radius: 999px; font-size: 13px; font-weight: 600;
  background: var(--paper2); border: 1.5px solid var(--line); color: var(--ink2);
  box-shadow: var(--shadow-s);
}
.doc-related a:hover { border-color: var(--green); color: var(--green-d); }

/* ---------- 页脚 ---------- */
.site-foot { margin-top: 84px; background: #211d19; color: #b9ae9c; font-size: 13px; }
.foot-grid { display: grid; grid-template-columns: 1.5fr 1fr 1.3fr; gap: 36px; padding: 50px 0 34px; }
.foot-brand .fb-row { display: flex; align-items: center; gap: 12px; }
.foot-brand .fb-name { font-size: 17px; color: #f6f1e6; letter-spacing: 3px; font-weight: 700; }
.foot-brand .fb-sl { margin-top: 12px; font-family: var(--kai); font-size: 13.5px; letter-spacing: 2px; color: #8a7e68; }
.foot-col h4 { color: #f6f1e6; font-size: 13.5px; letter-spacing: 2px; margin-bottom: 14px; }
.foot-col a { display: block; padding: 5px 0; color: #b9ae9c; }
.foot-col a:hover { color: #f6f1e6; }
.foot-col p { padding: 5px 0; line-height: 1.9; }
.foot-legal {
  border-top: 1px solid rgba(246, 241, 230, 0.12);
  padding: 22px 0 30px; text-align: center; line-height: 2.1; font-size: 12px; color: #8a7e68;
}
.foot-legal a { color: #b9ae9c; }
.foot-legal a:hover { color: #f6f1e6; text-decoration: underline; }

/* ---------- 滚动浮现 ---------- */
.rv { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; gap: 4px; padding: 12px 18px 16px;
    background: var(--paper2); border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow); display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; }
  .hero-in { padding: 60px 24px 56px; }
  .hero h1 { font-size: 36px; letter-spacing: 10px; text-indent: 10px; }
  .hero-verse { display: none; }
  .duo { grid-template-columns: 1fr; }
  .doc-grid { grid-template-columns: 1fr; }
  .doc-toc { position: static; display: flex; flex-wrap: wrap; gap: 4px; }
  .doc-toc .tt { width: 100%; }
  .doc-body { padding: 28px 22px; }
  .foot-grid { grid-template-columns: 1fr; gap: 26px; }
  .kv-row .k { width: 118px; }
  .kv-def .k { width: 128px; }
  .band { padding: 32px 26px; }
  .band::after { display: none; }
}