/* ===========================================================
   聆语 Lingio · 官网设计系统
   承接 APP 极简语言（方向 B / AI-Native）
   双主题 · 唯一金色重音 · 衬线承载内容 · 去盒子 · 发丝线 · 声波母题
   =========================================================== */

/* ---------- 0. 自托管字体（本地化，不依赖 Google Fonts） ----------
   Noto Serif SC 400/600/700 · Noto Sans SC 400/500/600/700
   已按本站实际用字子集化（pyftsubset），woff2，font-display:swap。
   重新生成：见 build-fonts.sh。 */
@font-face { font-family: "Noto Serif SC"; font-style: normal; font-weight: 400; font-display: swap; src: local("Noto Serif SC"), url("assets/fonts/NotoSerifSC-400.woff2") format("woff2"); }
@font-face { font-family: "Noto Serif SC"; font-style: normal; font-weight: 600; font-display: swap; src: local("Noto Serif SC SemiBold"), url("assets/fonts/NotoSerifSC-600.woff2") format("woff2"); }
@font-face { font-family: "Noto Serif SC"; font-style: normal; font-weight: 700; font-display: swap; src: local("Noto Serif SC Bold"), url("assets/fonts/NotoSerifSC-700.woff2") format("woff2"); }
@font-face { font-family: "Noto Sans SC"; font-style: normal; font-weight: 400; font-display: swap; src: local("Noto Sans SC"), url("assets/fonts/NotoSansSC-400.woff2") format("woff2"); }
@font-face { font-family: "Noto Sans SC"; font-style: normal; font-weight: 500; font-display: swap; src: local("Noto Sans SC Medium"), url("assets/fonts/NotoSansSC-500.woff2") format("woff2"); }
@font-face { font-family: "Noto Sans SC"; font-style: normal; font-weight: 600; font-display: swap; src: local("Noto Sans SC SemiBold"), url("assets/fonts/NotoSansSC-600.woff2") format("woff2"); }
@font-face { font-family: "Noto Sans SC"; font-style: normal; font-weight: 700; font-display: swap; src: local("Noto Sans SC Bold"), url("assets/fonts/NotoSansSC-700.woff2") format("woff2"); }

/* ---------- 1. Tokens（与 APP MIN 对象逐字一致） ---------- */
:root,
[data-theme="dark"] {
  --bg:        #0A111B;
  --bg-2:      #0d1622;       /* 抬升面（极轻） */
  --text:      #F2EEE6;
  --mut:       rgba(242,238,230,0.56);
  --mut2:      rgba(242,238,230,0.34);
  --hair:      rgba(242,238,230,0.10);
  --hair2:     rgba(242,238,230,0.18);
  --gold:      #E2AA52;
  --gold-soft: #C8893C;
  --gold-ink:  #23160A;       /* 金底之上的文字色 */
  --aura:      rgba(226,170,82,0.18);
  --field:     rgba(242,238,230,0.05);
  --seg:       rgba(242,238,230,0.06);
  --nav-bg:    rgba(10,17,27,0.72);
  --hero-grad: radial-gradient(120% 90% at 50% -12%, #122033 0%, #0A111B 58%, #070d15 100%);
  --shadow-phone: 0 40px 90px rgba(0,0,0,0.55), 0 12px 28px rgba(0,0,0,0.35);
  --shadow-soft: 0 18px 50px rgba(0,0,0,0.35);
}
[data-theme="light"] {
  --bg:        #FAF7F0;
  --bg-2:      #F3EEE3;
  --text:      #141C26;
  --mut:       rgba(20,28,38,0.58);
  --mut2:      rgba(20,28,38,0.36);
  --hair:      rgba(20,28,38,0.10);
  --hair2:     rgba(20,28,38,0.18);
  --gold:      #A8691F;
  --gold-soft: #9C7016;
  --gold-ink:  #ffffff;
  --aura:      rgba(200,137,60,0.16);
  --field:     rgba(20,28,38,0.04);
  --seg:       rgba(20,28,38,0.05);
  --nav-bg:    rgba(250,247,240,0.78);
  --hero-grad: radial-gradient(120% 90% at 50% -12%, #FFFDF8 0%, #FAF7F0 55%, #F2ECE0 100%);
  --shadow-phone: 0 40px 80px rgba(20,28,38,0.22), 0 12px 26px rgba(20,28,38,0.12);
  --shadow-soft: 0 14px 40px rgba(20,28,38,0.10);
}

/* ---------- 2. Reset & base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans SC", -apple-system, "PingFang SC", "Helvetica Neue", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .45s ease, color .45s ease;
  overflow-x: hidden;
}
::selection { background: rgba(226,170,82,0.26); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
h1,h2,h3,h4,p { margin: 0; }
button { font: inherit; cursor: pointer; }

.serif { font-family: "Noto Serif SC", "Songti SC", Georgia, serif; }

/* ---------- 3. Layout ---------- */
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 32px; }
.wrap-narrow { max-width: 760px; margin: 0 auto; padding: 0 32px; }
section { position: relative; }
.section-pad { padding: 116px 0; }
.section-pad-sm { padding: 76px 0; }
.hairline { height: 1px; background: var(--hair); border: 0; margin: 0; }

/* 顶部金色微光（母题：AI 智能微光） */
.aura-top {
  position: absolute; top: -160px; left: 50%; transform: translateX(-50%);
  width: 860px; height: 520px; pointer-events: none; z-index: 0;
  background: radial-gradient(circle at 50% 42%, var(--aura), transparent 66%);
}

/* ---------- 4. Typography scale ---------- */
.eyebrow {
  font-size: 12px; font-weight: 600; letter-spacing: 2.4px;
  color: var(--gold); text-transform: uppercase;
  display: inline-flex; align-items: center; gap: 9px;
}
.eyebrow::before {
  content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--gold);
}
.eyebrow.no-dot::before { display: none; }
.display {
  font-family: "Noto Serif SC", "Songti SC", Georgia, serif;
  font-weight: 700; line-height: 1.16; letter-spacing: .5px;
  font-size: clamp(38px, 5.4vw, 66px);
  text-wrap: balance;
}
.h2 {
  font-family: "Noto Serif SC", "Songti SC", Georgia, serif;
  font-weight: 700; line-height: 1.2;
  font-size: clamp(28px, 3.6vw, 44px);
  letter-spacing: .4px; text-wrap: balance;
}
.h3 {
  font-family: "Noto Serif SC", "Songti SC", Georgia, serif;
  font-weight: 600; font-size: clamp(20px, 2vw, 26px); line-height: 1.3;
}
.lede { font-size: clamp(16px, 1.5vw, 19px); color: var(--mut); line-height: 1.74; }
.muted { color: var(--mut); }
.muted2 { color: var(--mut2); }
.caption { font-size: 13px; color: var(--mut); }

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 0 26px; height: 52px; border-radius: 15px; border: none;
  font-size: 15.5px; font-weight: 600; white-space: nowrap;
  transition: transform .18s ease, box-shadow .25s ease, background .25s ease, border-color .2s ease, color .2s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(180deg, var(--gold), var(--gold-soft));
  color: var(--gold-ink);
  box-shadow: 0 8px 22px rgba(226,170,82,0.26);
}
.btn-primary:hover { box-shadow: 0 12px 30px rgba(226,170,82,0.36); transform: translateY(-2px); }
.btn-ghost {
  background: transparent; color: var(--text);
  border: 1px solid var(--hair2);
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold); }
.btn-sm { height: 42px; padding: 0 18px; font-size: 14px; border-radius: 12px; }
.btn-text {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--gold); font-weight: 600; font-size: 15.5px; background: none; border: none; padding: 0;
}
.btn-text .arrow {
  width: 32px; height: 32px; border-radius: 50%; border: 1.5px solid var(--gold);
  display: inline-flex; align-items: center; justify-content: center; transition: transform .2s;
}
.btn-text:hover .arrow { transform: translateX(3px); }

/* ---------- 6. Nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200; height: 70px;
  display: flex; align-items: center;
  transition: background .3s ease, border-color .3s ease, backdrop-filter .3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--hair);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.brand { display: flex; align-items: center; gap: 11px; }
.brand .mark { width: 34px; height: 34px; }
.brand .word { font-family: "Noto Serif SC", Georgia, serif; font-weight: 700; font-size: 21px; letter-spacing: 1px; }
.brand .word small { font-family: "Noto Sans SC", sans-serif; font-weight: 600; font-size: 11px; letter-spacing: 3px; color: var(--gold); margin-left: 8px; vertical-align: 2px; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { font-size: 14.5px; color: var(--mut); font-weight: 500; transition: color .18s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 14px; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--hair2);
  background: var(--field); color: var(--text);
  display: inline-flex; align-items: center; justify-content: center; transition: border-color .2s, color .2s;
}
.icon-btn:hover { border-color: var(--gold); color: var(--gold); }
.lang-btn {
  border: 1px solid var(--hair2); background: none; color: var(--mut);
  border-radius: 9px; padding: 7px 12px; font-size: 13px; font-weight: 600; letter-spacing: .5px;
}
.lang-btn:hover { color: var(--text); border-color: var(--hair2); }
.nav-toggle { display: none; }

/* 移动端抽屉 */
.mobile-menu {
  position: fixed; inset: 70px 0 0 0; z-index: 190; background: var(--bg);
  padding: 28px 32px; display: none; flex-direction: column; gap: 4px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a { padding: 18px 0; border-bottom: 1px solid var(--hair); font-size: 18px; font-family: "Noto Serif SC", serif; }
.mobile-menu .btn { margin-top: 22px; }

/* ---------- 7. Hairline rows / lists ---------- */
.rows { display: flex; flex-direction: column; }
.row {
  display: flex; align-items: center; gap: 18px; padding: 24px 2px;
  border-top: 1px solid var(--hair); text-align: left;
}
.row:first-child { border-top: none; }
.row .row-title { font-size: 17px; font-weight: 600; }
.row .row-sub { font-size: 14px; color: var(--mut); margin-top: 3px; }
.row .row-num { font-family: "Noto Serif SC", serif; color: var(--gold); font-weight: 700; font-size: 15px; }

/* ---------- 8. Feature blocks (去盒子：发丝线网格) ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; }
.feature {
  padding: 40px 38px; border-top: 1px solid var(--hair); border-left: 1px solid var(--hair);
  transition: background .3s;
}
.feature:hover { background: var(--field); }
.feature .idx { font-family: "Noto Serif SC", serif; font-weight: 700; font-size: 14px; color: var(--gold); letter-spacing: 1px; }
.feature h3 { font-family: "Noto Serif SC", serif; font-weight: 700; font-size: 24px; margin-top: 16px; }
.feature .en { font-size: 12.5px; color: var(--mut2); letter-spacing: 1px; margin-top: 4px; text-transform: uppercase; }
.feature p { font-size: 14.5px; color: var(--mut); line-height: 1.7; margin-top: 14px; }

/* ---------- 9. Stats ---------- */
.stat-strip { display: flex; flex-wrap: wrap; gap: 0; }
.stat { padding: 0 38px; border-left: 1px solid var(--hair); }
.stat:first-child { padding-left: 0; border-left: none; }
.stat .num { font-family: "Noto Serif SC", serif; font-weight: 700; font-size: clamp(34px, 4vw, 52px); line-height: 1; letter-spacing: .5px; }
.stat .num .unit { font-size: .5em; color: var(--gold); margin-left: 3px; }
.stat .label { font-size: 13.5px; color: var(--mut); margin-top: 12px; }
.stat .desc { font-size: 12.5px; color: var(--mut2); margin-top: 6px; max-width: 220px; line-height: 1.55; }

/* ---------- 10. Chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  padding: 9px 16px; border-radius: 13px; border: 1px solid var(--hair2);
  font-size: 13.5px; color: var(--mut); background: none; transition: all .18s;
}
.chip.on, .chip:hover { border-color: var(--gold); color: var(--gold); background: rgba(226,170,82,0.08); }

/* ---------- 11. Phone art ---------- */
.phone-img { filter: drop-shadow(var(--shadow-phone)); }

/* ---------- 12. Demo compare ---------- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: stretch; }
.compare-card { padding: 32px; border-radius: 18px; border: 1px solid var(--hair); }
.compare-card.before { background: var(--field); }
.compare-card.after { background: var(--field); border-color: var(--gold); position: relative; }
.compare-card .tag { font-size: 12px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; }
.compare-card.before .tag { color: var(--mut2); }
.compare-card.after .tag { color: var(--gold); }
.compare-card .quote { font-family: "Noto Serif SC", serif; font-size: 18px; line-height: 1.85; margin-top: 18px; }
.compare-card.before .quote { color: var(--mut); }
.compare-card .src { font-size: 12px; color: var(--mut2); margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--hair); }

/* ---------- 13. Pricing ---------- */
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.price {
  padding: 38px 32px; border-radius: 20px; border: 1px solid var(--hair); display: flex; flex-direction: column;
  transition: border-color .25s, transform .25s;
}
.price.featured { border-color: var(--gold); background: var(--field); }
.price:hover { transform: translateY(-4px); }
.price .tier { font-size: 14px; font-weight: 600; color: var(--mut); letter-spacing: .5px; }
.price .amt { font-family: "Noto Serif SC", serif; font-weight: 700; font-size: 42px; margin-top: 12px; line-height: 1; }
.price .amt small { font-size: 16px; color: var(--mut); font-family: "Noto Sans SC", sans-serif; font-weight: 500; }
.price .pdesc { font-size: 13.5px; color: var(--mut); margin-top: 14px; min-height: 40px; }
.price .plist { list-style: none; padding: 0; margin: 24px 0; display: flex; flex-direction: column; gap: 13px; flex: 1; }
.price .plist li { display: flex; gap: 11px; font-size: 14px; color: var(--text); align-items: flex-start; }
.price .plist li svg { flex-shrink: 0; margin-top: 3px; color: var(--gold); }
.badge {
  position: absolute; top: -11px; right: 24px; background: linear-gradient(180deg,var(--gold),var(--gold-soft));
  color: var(--gold-ink); font-size: 11px; font-weight: 700; letter-spacing: 1px; padding: 4px 12px; border-radius: 8px;
}

/* ---------- 14. FAQ ---------- */
.faq-item { border-top: 1px solid var(--hair); }
.faq-q {
  width: 100%; background: none; border: none; text-align: left; padding: 26px 2px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  font-size: 18px; font-weight: 600; color: var(--text); font-family: "Noto Serif SC", serif;
}
.faq-q .pm { flex-shrink: 0; width: 22px; height: 22px; position: relative; color: var(--gold); transition: transform .3s; }
.faq-q .pm::before, .faq-q .pm::after { content: ""; position: absolute; background: currentColor; border-radius: 2px; }
.faq-q .pm::before { top: 10px; left: 2px; right: 2px; height: 2px; }
.faq-q .pm::after { left: 10px; top: 2px; bottom: 2px; width: 2px; transition: transform .3s; }
.faq-item.open .pm::after { transform: scaleY(0); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-a .inner { padding: 0 2px 26px; color: var(--mut); font-size: 15px; line-height: 1.78; max-width: 760px; }

/* ---------- 15. Testimonials ---------- */
.quote-big { font-family: "Noto Serif SC", serif; font-weight: 600; font-size: clamp(22px, 3vw, 34px); line-height: 1.5; text-wrap: balance; }
.quote-meta { display: flex; align-items: center; gap: 14px; margin-top: 30px; }
.quote-meta .av { width: 48px; height: 48px; border-radius: 50%; background: var(--field); border: 1px solid var(--hair2); display: flex; align-items: center; justify-content: center; font-family: "Noto Serif SC", serif; font-weight: 700; color: var(--gold); }

/* ---------- 16. Footer ---------- */
.footer { border-top: 1px solid var(--hair); padding: 70px 0 40px; position: relative; }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; }
.footer h4 { font-size: 13px; color: var(--mut2); letter-spacing: 1px; text-transform: uppercase; font-weight: 600; margin-bottom: 18px; }
.footer-links { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: 14.5px; color: var(--mut); transition: color .18s; }
.footer-links a:hover { color: var(--text); }
.footer-bottom { margin-top: 56px; padding-top: 28px; border-top: 1px solid var(--hair); display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: center; justify-content: space-between; }
.footer-bottom, .footer-bottom a { font-size: 12.5px; color: var(--mut2); }
.footer-bottom a:hover { color: var(--mut); }

/* ---------- 17. Modals (CTA) ---------- */
.modal-scrim {
  position: fixed; inset: 0; z-index: 300; background: rgba(5,9,15,0.62);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  display: none; align-items: center; justify-content: center; padding: 24px;
  opacity: 0; transition: opacity .25s;
}
.modal-scrim.open { display: flex; opacity: 1; }
.modal {
  width: 100%; max-width: 460px; background: var(--bg-2); border: 1px solid var(--hair2);
  border-radius: 22px; padding: 38px 36px; position: relative;
  box-shadow: var(--shadow-soft); transform: translateY(12px); transition: transform .3s;
}
.modal-scrim.open .modal { transform: translateY(0); }
.modal .close { position: absolute; top: 20px; right: 20px; width: 34px; height: 34px; border-radius: 50%; background: var(--field); border: none; color: var(--mut); display: flex; align-items: center; justify-content: center; }
.modal .close:hover { color: var(--text); }
.modal h3 { font-family: "Noto Serif SC", serif; font-weight: 700; font-size: 26px; }
.modal .msub { color: var(--mut); font-size: 14.5px; margin-top: 10px; line-height: 1.6; }
.field-group { display: flex; flex-direction: column; gap: 12px; margin-top: 26px; }
.input {
  width: 100%; padding: 14px 16px; border-radius: 12px; border: 1px solid var(--hair2);
  background: var(--field); color: var(--text); font-size: 15px; outline: none; transition: border-color .2s;
}
.input:focus { border-color: var(--gold); }
.input::placeholder { color: var(--mut2); }
.modal .btn { width: 100%; margin-top: 6px; }
.modal .note { font-size: 12px; color: var(--mut2); margin-top: 14px; text-align: center; }
.modal .ok { text-align: center; padding: 16px 0; }
.modal .ok .check { width: 56px; height: 56px; border-radius: 50%; background: rgba(226,170,82,0.14); color: var(--gold); display: flex; align-items: center; justify-content: center; margin: 0 auto 18px; }
.qr-box { width: 180px; height: 180px; margin: 24px auto 8px; border-radius: 16px; border: 1px solid var(--hair2); background: var(--field); display: flex; align-items: center; justify-content: center; }

/* 浮动微信按钮 */
.fab {
  position: fixed; right: 26px; bottom: 26px; z-index: 150;
  height: 52px; padding: 0 20px; border-radius: 26px; border: 1px solid var(--hair2);
  background: var(--bg-2); color: var(--text); display: inline-flex; align-items: center; gap: 9px;
  font-size: 14px; font-weight: 600; box-shadow: var(--shadow-soft);
  transition: border-color .2s, color .2s, transform .2s;
}
.fab:hover { border-color: var(--gold); color: var(--gold); transform: translateY(-2px); }

/* ---------- 18. Page hero (内页通用) ---------- */
.page-hero { padding: 150px 0 70px; }
.page-hero .display { margin-top: 18px; }
.page-hero .lede { margin-top: 22px; max-width: 620px; }

/* ---------- 19. Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s cubic-bezier(.32,.72,0,1), transform .7s cubic-bezier(.32,.72,0,1); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 21. 内页：长文 / 法律文档 ---------- */
.doc { max-width: 780px; margin: 0 auto; }
.doc h2 { font-family: "Noto Serif SC", serif; font-weight: 700; font-size: 24px; margin: 52px 0 16px; scroll-margin-top: 90px; }
.doc h3 { font-family: "Noto Serif SC", serif; font-weight: 600; font-size: 18px; margin: 30px 0 10px; }
.doc p, .doc li { color: var(--mut); font-size: 15.5px; line-height: 1.85; }
.doc p { margin: 12px 0; }
.doc ul { padding-left: 20px; margin: 12px 0; }
.doc li { margin: 7px 0; }
.doc strong { color: var(--text); font-weight: 600; }
.doc-table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14.5px; }
.doc-table th, .doc-table td { text-align: left; padding: 13px 14px; border-bottom: 1px solid var(--hair); vertical-align: top; }
.doc-table th { color: var(--text); font-weight: 600; font-size: 13px; letter-spacing: .5px; }
.doc-table td { color: var(--mut); line-height: 1.65; }
.doc-meta { display: flex; gap: 22px; flex-wrap: wrap; color: var(--mut2); font-size: 13px; margin-top: 18px; }
.doc-toc { position: sticky; top: 100px; }
.doc-toc a { display: block; padding: 7px 0; font-size: 13.5px; color: var(--mut); border-left: 1px solid var(--hair); padding-left: 16px; transition: color .15s, border-color .15s; }
.doc-toc a:hover { color: var(--text); border-color: var(--gold); }
.doc-layout { display: grid; grid-template-columns: 220px 1fr; gap: 56px; align-items: start; }

/* ---------- 22. 时间线 ---------- */
.timeline { display: flex; flex-direction: column; }
.tl-item { display: grid; grid-template-columns: 120px 1fr; gap: 28px; padding: 26px 0; border-top: 1px solid var(--hair); }
.tl-item:first-child { border-top: none; }
.tl-when { font-family: "Noto Serif SC", serif; font-weight: 700; color: var(--gold); font-size: 17px; }
.tl-what h3 { font-size: 17px; font-weight: 600; }
.tl-what p { color: var(--mut); font-size: 14.5px; margin-top: 6px; line-height: 1.7; }

/* ---------- 23. 工作流场景（步骤） ---------- */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }
.flow-step { padding: 30px 26px 30px 0; border-top: 2px solid var(--gold); position: relative; }
.flow-step .sn { font-family: "Noto Serif SC", serif; font-weight: 700; color: var(--gold); font-size: 14px; }
.flow-step h3 { font-family: "Noto Serif SC", serif; font-size: 19px; margin-top: 10px; }
.flow-step p { color: var(--mut); font-size: 14px; line-height: 1.7; margin-top: 10px; }

/* ---------- 24. 知识图谱画布 ---------- */
.graph-wrap { position: relative; border: 1px solid var(--hair); border-radius: 20px; background: var(--field); overflow: hidden; }
.graph-wrap svg { display: block; width: 100%; height: auto; }
.graph-node circle { cursor: pointer; transition: r .2s; }
.graph-legend { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 22px; }
.graph-legend span { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--mut); }
.graph-legend i { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.node-detail { border: 1px solid var(--hair); border-radius: 16px; padding: 24px; background: var(--bg-2); min-height: 200px; }

/* ---------- 20. Responsive ---------- */
@media (max-width: 920px) {
  .nav-links { display: none; }
  .nav-toggle { display: inline-flex; }
  .lang-btn.desk { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature { border-left: none; }
  .compare { grid-template-columns: 1fr; }
  .price-grid { grid-template-columns: 1fr; max-width: 440px; margin: 0 auto; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .section-pad { padding: 84px 0; }
  .doc-layout { grid-template-columns: 1fr; gap: 0; }
  .doc-toc { display: none; }
  .flow { grid-template-columns: 1fr 1fr; }
  .tl-item { grid-template-columns: 90px 1fr; gap: 18px; }
}
@media (max-width: 620px) {
  .wrap, .wrap-narrow { padding: 0 22px; }
  .stat-strip { gap: 26px 0; }
  .stat { width: 100%; padding-left: 0; border-left: none; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .fab { right: 16px; bottom: 16px; }
}