/* 金豆AI工作室 · jindou.site 设计系统
   色板取自定稿 logo：纯色金豆金 #EEB145 + 炭黑 #1B1B1E，去渐变
   品牌字规则：深色主题用 #EEB145，浅色主题用墨黑 */
:root {
  --gold: #EEB145;
  --gold-soft: #F6D48F;
  --gold-deep: #D89A32;
  --ink: #1B1B1E;
  --paper: #FAF7F0;
  --card: #FFFFFF;
  --text: #26262B;
  --muted: #6B6B72;
  --line: #E7E0D2;
  --gold-text: #8A5A12; /* 浅底上的金色文字：对比约 5.5:1，达 WCAG AA */
  --radius: 16px;
  --nav-h: 68px;
  --container: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--paper);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

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

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  background: rgba(250, 247, 240, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
}
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 15px; }
.nav-links a { color: var(--muted); transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--ink); font-weight: 600; }
.nav-toggle { display: none; }

/* ---------- Hero（深色品牌区段）---------- */
.hero {
  background: var(--ink);
  color: #EDEBE6;
  padding: 96px 0 104px;
}
.hero-inner { display: flex; align-items: center; gap: 64px; }
.hero-logo { width: 168px; flex: none; border-radius: 36px; }
.hero h1 {
  font-size: 44px;
  line-height: 1.25;
  color: var(--gold);
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.hero .sub {
  font-size: 19px;
  color: #B9B6AE;
  margin-bottom: 32px;
}
.hero .cta-row { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .2s, box-shadow .2s, background .2s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-2px); }
.btn-gold { background: var(--gold); color: var(--ink); }
.btn-gold:hover { background: var(--gold-soft); box-shadow: 0 8px 24px rgba(238, 177, 69, .28); }
.btn-ghost { border-color: rgba(237, 235, 230, .35); color: #EDEBE6; }
.btn-ghost:hover { border-color: var(--gold); color: var(--gold); }
.btn-ghost.dark { border-color: var(--line); color: var(--text); }
.btn-ghost.dark:hover { border-color: var(--ink); color: var(--ink); }
.btn.disabled { opacity: .45; pointer-events: none; }

/* ---------- 区段通用 ---------- */
.section { padding: 88px 0; }
.section-head { margin-bottom: 44px; }
.section-head .eyebrow {
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--gold-text);
  font-weight: 700;
  margin-bottom: 8px;
}
.section-head h1,
.section-head h2 { font-size: 32px; color: var(--ink); line-height: 1.3; }
.section-head p { color: var(--muted); margin-top: 10px; max-width: 640px; }
.section.dark { background: var(--ink); }
.section.dark .section-head h1,
.section.dark .section-head h2 { color: var(--gold); }
.section.dark .section-head .eyebrow { color: var(--gold); }
.section.dark .card .card-link { color: var(--gold); }
.section.dark .prose a { color: var(--gold); }
.section.dark .prose a:hover { color: var(--gold-soft); }
.section.dark .section-head p { color: #B9B6AE; }

/* ---------- 产品卡片 ---------- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform .25s, box-shadow .25s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(27, 27, 30, .08); }
.card .card-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  margin-bottom: 20px;
}
.card h3 { font-size: 20px; color: var(--ink); margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 15px; }
.card .card-link {
  display: inline-block;
  margin-top: 18px;
  color: var(--gold-text);
  font-weight: 600;
  font-size: 15px;
}
.card .card-link:hover { color: var(--ink); }
.card.soon {
  background: transparent;
  border-style: dashed;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}
.card.soon h3 { color: var(--muted); font-weight: 500; }
.section.dark .card.soon { border-color: rgba(237, 235, 230, .2); }
.section.dark .card.soon h3 { color: #8C8A84; }

/* ---------- 特性列表（产品页）---------- */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px 40px; }
.feature { display: flex; gap: 14px; align-items: flex-start; }
.feature .dot {
  flex: none;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--gold);
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  margin-top: 4px;
}
.feature h4 { font-size: 17px; color: var(--ink); margin-bottom: 4px; }
.feature p { font-size: 14.5px; color: var(--muted); }

/* ---------- 下载区 ---------- */
.download-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.download-box .plat { display: flex; align-items: center; gap: 14px; }
.download-box .plat .name { font-weight: 700; color: var(--ink); }
.download-box .plat .meta { font-size: 13px; color: var(--muted); }
.badge-soon {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background: rgba(238, 177, 69, .15);
  color: var(--gold-text);
  font-size: 12.5px;
  font-weight: 600;
}

/* ---------- 关于/文字版式 ---------- */
h1[id], h2[id], h3[id] { scroll-margin-top: calc(var(--nav-h) + 24px); }
#contact { font-size: 26px; }

.prose { max-width: 720px; }
.prose p { margin-bottom: 16px; color: var(--text); }
.prose h3 { color: var(--ink); font-size: 21px; margin: 32px 0 12px; }
.prose ul { padding-left: 22px; color: var(--text); margin-bottom: 16px; }
.prose li { margin-bottom: 6px; }
.prose a { color: var(--gold-text); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--ink); }
.prose .legal-updated { color: var(--muted); font-size: 13.5px; margin-bottom: 28px; }

/* 深色区段内的正文 */
.section.dark .prose p,
.section.dark .prose ul { color: #D8D5CE; }
.section.dark .prose h3 { color: var(--gold); }

/* ---------- 图形释义 ---------- */
.logo-mark {
  display: flex;
  align-items: center;
  gap: 26px;
  margin: 44px 0 8px;
}
.logo-mark img { width: 128px; height: auto; flex: none; }
.logo-mark figcaption { flex: 1; min-width: 0; padding-top: 2px; }
.logo-mark p { color: var(--muted); font-size: 14.5px; line-height: 2; margin-bottom: 6px; }
.logo-mark p:last-child { margin-bottom: 0; }
.logo-mark p.logo-mark-lead { color: var(--gold-text); }
.section.dark .logo-mark p { color: #B9B6AE; }
.section.dark .logo-mark p.logo-mark-lead { color: var(--gold); }

@media (max-width: 640px) {
  .logo-mark { flex-direction: column; gap: 16px; }
  .logo-mark img { width: 96px; }
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--ink);
  color: #8C8A84;
  padding: 56px 0 40px;
  font-size: 14px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(237, 235, 230, .12);
}
.footer .brand { color: #EDEBE6; }
.footer nav { display: flex; gap: 24px; flex-wrap: wrap; }
.footer nav a:hover { color: var(--gold); }
.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.footer .icp a { color: #8C8A84; text-decoration: underline; text-underline-offset: 3px; }
.footer .icp a:hover { color: var(--gold); }

/* ---------- 入场动效（克制：仅淡入+微位移）---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.on { opacity: 1; transform: none; }
/* 无 JS 环境兜底：内容不得因动效脚本缺失而不可见 */
@media (scripting: none) {
  .reveal { opacity: 1; transform: none; transition: none; }
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 36px; }
}
@media (max-width: 640px) {
  .section { padding: 60px 0; }
  .hero { padding: 64px 0 72px; }
  .hero-inner { flex-direction: column; text-align: center; gap: 36px; }
  .hero-logo { width: 120px; }
  .hero .cta-row { justify-content: center; }
  .grid, .grid.two, .feature-list { grid-template-columns: 1fr; }
  .nav-links {
    position: fixed;
    top: var(--nav-h); right: 0; left: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 24px; width: 100%; }
  .footer nav { gap: 18px; }
  .nav-toggle {
    display: flex;
    align-items: center; justify-content: center;
    width: 40px; height: 40px;
    background: none; border: none; cursor: pointer;
  }
  .nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
    content: ""; display: block; width: 20px; height: 2px;
    background: var(--ink); position: relative;
  }
  .nav-toggle span::before { position: absolute; top: -6px; }
  .nav-toggle span::after { position: absolute; top: 6px; }
}