/* =====================================================================
   链席文化 · 数据资产 Token 计量与 ABS 现金流基础设施 官网
   依据 specs/website-visual-spec.md（许宁）+ website-brief.md（顾言）
   token 全部取自既有 VI，不另起品牌。
   ===================================================================== */

/* ---------- 1. Design Tokens ---------- */
:root {
  /* 品牌主色 */
  --ink:        #17233B;  /* 墨蓝 · 主色 */
  --chain:      #0D9488;  /* 链青 · 强调与唯一 CTA 色 */
  --gold:       #D7A84B;  /* 文化金 · 点睛 ≤5% */

  /* 中性 / 背景 */
  --paper:      #F7F4EA;  /* 宣纸白 · 交替区底 */
  --bg:         #FAFAF8;  /* 页面默认底 */
  --surface:    #FFFFFF;  /* 卡片/表单底 */
  --text:       #1B2436;  /* 正文主文本 */
  --text-muted: #5F6776;  /* 次要文本 */
  --border:     #E7E0D2;  /* 描边 · 分隔 */

  /* 衍生 */
  --ink-90:     rgba(23,35,59,.90);
  --chain-tint: #E6F4F2;
  --chain-dark: #0B7268;
  --gold-tint:  #F6ECD4;
  --shadow:     0 1px 2px rgba(23,35,59,.04), 0 8px 24px rgba(23,35,59,.06);
  --shadow-lg:  0 2px 6px rgba(23,35,59,.06), 0 18px 48px rgba(23,35,59,.12);

  /* 字体栈（沿用 VI，系统字体，离线可用） */
  --font-cn: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --font-en: "Avenir Next","Inter","Helvetica Neue",Arial,sans-serif;
  --font-mono: "SFMono-Regular","JetBrains Mono","Roboto Mono",Menlo,monospace;

  /* 栅格 */
  --container: 1200px;
  --gutter: 24px;
  --radius: 14px;
  --radius-sm: 10px;
  --radius-lg: 20px;

  --nav-h: 72px;
}

/* ---------- 2. Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--chain); outline-offset: 2px; border-radius: 4px; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ---------- 3. Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: 96px; position: relative; }
.section--paper { background: var(--paper); }
.section--ink {
  background: var(--ink);
  color: #EAEEF5;
  background-image: radial-gradient(circle at 85% 12%, rgba(13,148,136,.16), transparent 42%);
}
.section--ink h2, .section--ink h3 { color: #FFFFFF; }
.section--ink .lead { color: #B9C2D4; }

/* 区块标题块 */
.eyebrow {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--chain);
  margin-bottom: 14px;
}
.section--ink .eyebrow { color: #5FD2C5; }
.s-head { max-width: 760px; margin-bottom: 56px; }
.s-head--center { margin-inline: auto; text-align: center; }

h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.18; font-weight: 760; color: var(--ink); letter-spacing: -.01em; }
h2 { font-size: clamp(26px, 3.4vw, 36px); line-height: 1.25; font-weight: 720; color: var(--ink); letter-spacing: -.01em; }
h3 { font-size: clamp(20px, 2.2vw, 22px); line-height: 1.35; font-weight: 700; color: var(--ink); }
.lead { font-size: clamp(17px, 2vw, 20px); line-height: 1.6; font-weight: 400; color: var(--text-muted); }
.body-max { max-width: 72ch; }
.num, .en { font-family: var(--font-en); font-feature-settings: "tnum" 1; }
.mono { font-family: var(--font-mono); }

/* ---------- 4. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 16px; font-weight: 600; line-height: 1;
  padding: 14px 26px; border-radius: var(--radius);
  border: 1.5px solid transparent; transition: all .18s ease;
  white-space: nowrap;
}
.btn--primary { background: var(--chain); color: #fff; border-color: var(--chain); box-shadow: 0 6px 16px rgba(13,148,136,.24); }
.btn--primary:hover { background: var(--chain-dark); border-color: var(--chain-dark); transform: translateY(-1px); box-shadow: 0 10px 22px rgba(13,148,136,.30); }
.btn--primary:active { transform: translateY(1px); }
.btn--secondary { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn--secondary:hover { background: var(--paper); }
.section--ink .btn--secondary { color: #fff; border-color: rgba(255,255,255,.55); }
.section--ink .btn--secondary:hover { background: rgba(255,255,255,.10); }
.btn--sm { padding: 10px 18px; font-size: 14px; }
.btn .arrow { transition: transform .18s ease; }
.btn:hover .arrow { transform: translateX(3px); }

/* ---------- 5. Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100; height: var(--nav-h);
  background: rgba(255,255,255,.86); backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav__inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.nav__logo { height: 60px; }
.nav__logo img { height: 60px; width: auto; }
.nav__links { display: flex; align-items: center; gap: 26px; }
.nav__links a { font-size: 15px; color: var(--text); transition: color .15s; position: relative; }
.nav__links a:hover { color: var(--chain); }
.nav__right { display: flex; align-items: center; gap: 16px; }
.nav__toggle { display: none; background: none; border: 0; padding: 8px; color: var(--ink); }
.nav__toggle svg { width: 26px; height: 26px; }

/* ---------- 6. Hero (S1) ---------- */
.hero { position: relative; overflow: hidden; padding-block: 84px 96px; background: var(--bg); }
.hero__pattern {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background: url("assets/lianxi-culture-pattern.svg") right -120px top -80px / 620px no-repeat;
  opacity: .08;
}
.hero .container { position: relative; z-index: 1; }
.hero__grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero__redline {
  display: inline-flex; flex-wrap: wrap; gap: 6px 18px; align-items: center;
  font-size: 13px; color: var(--text-muted); margin-bottom: 22px;
  padding: 8px 14px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 999px; box-shadow: var(--shadow);
}
.hero__redline b { color: var(--ink); font-weight: 600; }
.hero__redline .dot { color: var(--gold); }
.hero h1 .hl { color: var(--chain); }
.hero__sub { margin-top: 22px; max-width: 38ch; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.hero__trust { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 13px; color: var(--text-muted); }
.hero__trust span { display: inline-flex; align-items: center; gap: 7px; }
.hero__trust span::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--chain); }

/* Hero 右侧：品牌化迷你架构卡 */
.hero__visual {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); padding: 28px; position: relative;
}
.hero__visual::before {
  content: "数据服务调用 → 经营现金流"; position: absolute; top: -13px; left: 24px;
  font-size: 12px; font-weight: 600; color: var(--chain); background: var(--surface);
  padding: 2px 12px; border: 1px solid var(--border); border-radius: 999px;
}
.minichain { display: flex; flex-direction: column; gap: 0; }
.minichain__node {
  display: flex; align-items: center; gap: 14px; padding: 13px 4px;
}
.minichain__ic {
  flex: none; width: 38px; height: 38px; border-radius: 10px;
  display: grid; place-items: center; background: var(--chain-tint); color: var(--chain);
}
.minichain__ic svg { width: 20px; height: 20px; }
.minichain__t { font-size: 14.5px; font-weight: 600; color: var(--ink); line-height: 1.4; }
.minichain__t small { display: block; font-weight: 400; font-size: 12.5px; color: var(--text-muted); }
.minichain__link { height: 14px; margin-left: 23px; border-left: 2px dashed var(--border); }
.minichain__foot { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border); font-size: 12.5px; color: var(--text-muted); }
.minichain__foot b { color: var(--ink); }

/* ---------- 7. Cards (全站唯一卡片) ---------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow); transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.card__ic {
  width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center;
  background: var(--chain-tint); color: var(--chain); margin-bottom: 18px;
}
.card__ic svg { width: 26px; height: 26px; }
.card h3 { margin-bottom: 10px; }
.card p { color: var(--text-muted); font-size: 15.5px; }
.card__kw { color: var(--chain); font-weight: 700; }

/* 痛点 → 解法卡 */
.painlist { margin-top: 14px; }
.painlist li { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--text-muted); padding-top: 8px; }
.painlist .fix { color: var(--ink); font-weight: 600; }
.painlist .ar { color: var(--chain); flex: none; }

/* ---------- 8. Quote / 金句块 ---------- */
.quote {
  border-left: 3px solid var(--gold); background: var(--paper);
  padding: 22px 26px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: clamp(17px, 2.2vw, 21px); line-height: 1.6; font-weight: 600; color: var(--ink);
}
.section--ink .quote { background: rgba(255,255,255,.06); color: #fff; }
.quote cite { display: block; margin-top: 10px; font-size: 13px; font-weight: 400; font-style: normal; color: var(--text-muted); }
.section--ink .quote cite { color: #9AA6BC; }

/* ---------- 9. S4 架构链路（HTML/CSS 重绘，品牌色） ---------- */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px 12px; margin-top: 8px; }
.flow__node {
  background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.18);
  border-radius: var(--radius-sm); padding: 16px 14px; position: relative;
}
.flow__node .n {
  font-family: var(--font-en); font-size: 12px; font-weight: 700; color: #5FD2C5; display: block; margin-bottom: 6px;
}
.flow__node .t { font-size: 15px; font-weight: 600; color: #fff; }
.flow__node .d { font-size: 12.5px; color: #AEB8CC; margin-top: 4px; line-height: 1.5; }
.flow__node--key { border-color: var(--chain); background: rgba(13,148,136,.16); }
.flow__node--abs { border-color: var(--gold); background: rgba(215,168,75,.12); }
.flow__node .t .accent { color: #5FD2C5; }
.flow__note {
  margin-top: 28px; display: flex; gap: 12px; align-items: flex-start;
  font-size: 14px; color: #C3CCDC; padding: 16px 20px;
  background: rgba(255,255,255,.05); border-radius: var(--radius-sm); border: 1px solid rgba(255,255,255,.14);
}
.flow__note b { color: #fff; }
.flow__note .ic { color: var(--gold); flex: none; margin-top: 1px; }

/* ---------- 10. S5 公式 + 表 + 定价 ---------- */
.formula {
  font-family: var(--font-mono); font-size: clamp(14px, 1.9vw, 18px);
  background: var(--ink); color: #EAF6F4; border-radius: var(--radius);
  padding: 24px 26px; text-align: center; overflow-x: auto; line-height: 1.7;
  box-shadow: var(--shadow);
}
.formula .op { color: var(--gold); padding: 0 6px; }
.formula .var { color: #5FD2C5; }
.formula .lhs { color: #fff; font-weight: 600; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table.data { width: 100%; border-collapse: collapse; min-width: 520px; background: var(--surface); }
table.data thead th { background: var(--ink); color: #fff; font-weight: 600; font-size: 14px; text-align: left; padding: 14px 18px; }
table.data thead th.r, table.data td.r { text-align: right; font-family: var(--font-en); }
table.data tbody td { padding: 13px 18px; font-size: 14.5px; border-top: 1px solid var(--border); color: var(--text); }
table.data tbody tr:nth-child(even) { background: var(--bg); }
table.data .tk { color: var(--chain); font-weight: 700; }

.pricing { margin-top: 24px; }
.pill-tag {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600;
  color: var(--ink); background: var(--gold-tint); border: 1px solid #EAD9AE;
  padding: 7px 14px; border-radius: 999px;
}
.pill-tag::before { content: ""; width: 7px; height: 7px; border-radius: 2px; background: var(--gold); }
.price-card h3 { font-size: 18px; }
.price-card .tag { font-size: 12px; color: var(--chain); font-weight: 700; letter-spacing: .04em; }

/* ---------- 11. S6 清分现金流 ---------- */
.flowpath { display: flex; flex-direction: column; gap: 0; }
.flowpath__step { display: flex; align-items: flex-start; gap: 16px; }
.flowpath__marker { display: flex; flex-direction: column; align-items: center; flex: none; }
.flowpath__dot { width: 14px; height: 14px; border-radius: 50%; background: var(--chain); border: 3px solid var(--chain-tint); margin-top: 6px; }
.flowpath__bar { width: 2px; flex: 1; background: var(--border); min-height: 26px; }
.flowpath__step:last-child .flowpath__bar { display: none; }
.flowpath__body { padding-bottom: 22px; }
.flowpath__body h4 { font-size: 16px; font-weight: 600; color: var(--ink); margin: 0; }
.flowpath__body p { font-size: 14px; color: var(--text-muted); margin-top: 3px; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
/* 清分占比堆叠条 */
.alloc { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.alloc__bar { display: flex; height: 26px; border-radius: 6px; overflow: hidden; margin-bottom: 22px; }
.alloc__bar span { display: block; height: 100%; }
.alloc__legend { display: grid; gap: 12px; }
.alloc__legend li { display: flex; align-items: center; gap: 10px; font-size: 14.5px; }
.alloc__legend .sw { width: 13px; height: 13px; border-radius: 3px; flex: none; }
.alloc__legend .lb { color: var(--text); }
.alloc__legend .pc { margin-left: auto; font-family: var(--font-en); font-weight: 700; color: var(--ink); }
.alloc__note { margin-top: 18px; font-size: 12.5px; color: var(--text-muted); }

/* ---------- 12. S7 入池标准 ---------- */
.gate-card { position: relative; }
.gate-card .no { font-family: var(--font-en); font-size: 30px; font-weight: 760; color: var(--gold); line-height: 1; margin-bottom: 12px; }
.gate-card h3 { font-size: 18px; }

/* ---------- 13. S8 受众分流 Tab ---------- */
.tabs__nav { display: inline-flex; gap: 6px; background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 6px; margin-bottom: 32px; box-shadow: var(--shadow); flex-wrap: wrap; }
.tabs__btn {
  border: 0; background: transparent; color: var(--text-muted); font-size: 15px; font-weight: 600;
  padding: 10px 22px; border-radius: 999px; transition: all .18s;
}
.tabs__btn[aria-selected="true"] { background: var(--ink); color: #fff; }
.tabs__panel { display: none; }
.tabs__panel.is-active { display: block; animation: fade .3s ease; }
.audience { display: grid; grid-template-columns: 1.1fr .9fr; gap: 36px; align-items: start; }
.audience__pitch { font-size: 16px; line-height: 1.8; color: var(--text); }
.audience__pitch .lead-line { font-size: 19px; font-weight: 600; color: var(--ink); margin-bottom: 14px; line-height: 1.5; }
.needlist li { display: flex; gap: 10px; padding: 9px 0; border-bottom: 1px dashed var(--border); font-size: 14.5px; color: var(--text); }
.needlist li:last-child { border-bottom: 0; }
.needlist .ck { color: var(--chain); flex: none; }

/* ---------- 14. S9 时间轴 ---------- */
.timeline { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; position: relative; margin-bottom: 36px; }
.timeline::before { content: ""; position: absolute; top: 7px; left: 6%; right: 6%; height: 2px; background: var(--border); z-index: 0; }
.tl-step { position: relative; z-index: 1; text-align: left; }
.tl-step .dot { width: 16px; height: 16px; border-radius: 50%; background: var(--surface); border: 3px solid var(--chain); margin-bottom: 16px; }
.tl-step .ph { font-family: var(--font-en); font-size: 12px; font-weight: 700; color: var(--chain); }
.tl-step h4 { font-size: 16px; font-weight: 600; color: var(--ink); margin: 4px 0 6px; }
.tl-step p { font-size: 13.5px; color: var(--text-muted); }
.closeloop {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  background: var(--chain-tint); border: 1px solid #BFE6E1; border-radius: var(--radius);
  padding: 20px 24px;
}
.closeloop b { color: var(--chain-dark); }
.closeloop .tag { font-size: 12px; font-weight: 700; color: #fff; background: var(--chain); padding: 5px 12px; border-radius: 999px; flex: none; }

/* ---------- 15. S10 风险对照表 ---------- */
.risk-row { display: grid; grid-template-columns: 1fr 1.2fr; gap: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.risk-row > div { padding: 16px 20px; border-top: 1px solid var(--border); }
.risk-row > div:nth-child(-n+2) { border-top: 0; background: var(--ink); color: #fff; font-weight: 600; font-size: 14px; }
.risk-row .risk { color: var(--text); font-size: 14.5px; border-right: 1px solid var(--border); }
.risk-row .ctrl { color: var(--text-muted); font-size: 14px; }
.risk-row .risk b { color: var(--ink); font-weight: 600; }

/* ---------- 16. S11 关于 ---------- */
.about { display: grid; grid-template-columns: 1.4fr .6fr; gap: 48px; align-items: center; }
.about__badge { text-align: center; }
.about__badge img { width: 96px; margin: 0 auto 16px; }
.about__badge .name { font-size: 14px; font-weight: 600; color: var(--ink); }
.about__badge .sub { font-size: 12.5px; color: var(--text-muted); margin-top: 4px; }
.about p + p { margin-top: 16px; }
.about .strat { font-size: 18px; font-weight: 600; color: var(--ink); border-left: 3px solid var(--chain); padding-left: 16px; margin-top: 22px; }

/* ---------- 17. S12 CTA / 联系 ---------- */
.contact { display: grid; grid-template-columns: 1fr 1.05fr; gap: 48px; align-items: start; }
.contact__qr { margin-top: 26px; display: flex; gap: 16px; align-items: center; }
.contact__qr img { width: 124px; height: 124px; background: #fff; padding: 8px; border-radius: var(--radius-sm); }
.contact__qr .cap { font-size: 13.5px; color: #B9C2D4; }
.contact__qr .cap b { display: block; color: #fff; font-size: 15px; margin-bottom: 4px; }
.form {
  background: var(--surface); border-radius: var(--radius-lg); padding: 32px;
  box-shadow: var(--shadow-lg); color: var(--text);
}
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 6px; font-weight: 600; }
.field input, .field select, .field textarea {
  width: 100%; font-family: inherit; font-size: 15px; color: var(--text);
  padding: 11px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); transition: border-color .15s, box-shadow .15s;
}
.field textarea { resize: vertical; min-height: 84px; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--chain); box-shadow: 0 0 0 3px var(--chain-tint);
}
.form__note { font-size: 12.5px; color: var(--text-muted); margin-top: 6px; }
.form__ok { display: none; padding: 14px 16px; background: var(--chain-tint); border: 1px solid #BFE6E1; border-radius: var(--radius-sm); color: var(--chain-dark); font-size: 14px; font-weight: 600; margin-bottom: 16px; }
.form__ok.show { display: block; }

/* ---------- 18. Footer ---------- */
.footer { background: var(--ink); color: #AEB8CC; padding-block: 56px 32px; }
.footer__top { display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; align-items: start; padding-bottom: 32px; border-bottom: 1px solid rgba(255,255,255,.12); }
.footer__logo { height: 60px; margin-bottom: 10px; }
.footer__redline { font-size: 13px; color: #C3CCDC; }
.footer__redline .dot { color: var(--gold); padding: 0 4px; }
.footer details { margin-top: 6px; }
.footer summary { font-size: 14px; font-weight: 600; color: #fff; cursor: pointer; list-style: none; padding: 8px 0; display: flex; align-items: center; gap: 8px; }
.footer summary::-webkit-details-marker { display: none; }
.footer summary::before { content: "+"; font-family: var(--font-en); color: var(--gold); width: 14px; }
.footer details[open] summary::before { content: "–"; }
.footer__policies li { font-size: 13px; padding: 6px 0 6px 22px; color: #9AA6BC; }
.footer__copy { padding-top: 24px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 12.5px; color: #8A95AC; }
.footer__copy .en { letter-spacing: .02em; }

/* ---------- 19. Reveal 动画 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* hero 载入分步 */
.hero [data-stagger] { opacity: 0; transform: translateY(18px); animation: heroIn .7s cubic-bezier(.2,.7,.3,1) forwards; }
.hero [data-stagger="1"] { animation-delay: .05s; }
.hero [data-stagger="2"] { animation-delay: .15s; }
.hero [data-stagger="3"] { animation-delay: .25s; }
.hero [data-stagger="4"] { animation-delay: .35s; }
.hero [data-stagger="5"] { animation-delay: .30s; }
@keyframes heroIn { to { opacity: 1; transform: none; } }

/* 锚点避让 sticky 导航 */
:where(section[id]) { scroll-margin-top: 88px; }

/* ---------- 20. 响应式 ---------- */
@media (max-width: 1023px) {
  .section { padding-block: 72px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero__grid { grid-template-columns: 1fr; gap: 40px; }
  .hero__sub { max-width: none; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .split, .audience, .contact, .about, .footer__top { grid-template-columns: 1fr; gap: 32px; }
  .timeline { grid-template-columns: repeat(2, 1fr); gap: 28px 20px; }
  .timeline::before { display: none; }
  .about { gap: 32px; }
  .about__badge { order: -1; }
}
@media (max-width: 767px) {
  :root { --nav-h: 64px; }
  .section { padding-block: 56px; }
  .nav__links { display: none; position: absolute; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0; background: var(--surface);
    border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lg); padding: 8px; }
  .nav__links.open { display: flex; }
  .nav__links a { padding: 13px 14px; border-radius: var(--radius-sm); font-size: 16px; }
  .nav__links a:hover { background: var(--paper); }
  .nav__toggle { display: inline-flex; }
  .nav__right .btn { display: none; }
  .grid-2, .grid-3, .flow, .timeline { grid-template-columns: 1fr; }
  .s-head { margin-bottom: 40px; }
  .form__row { grid-template-columns: 1fr; }
  .hero__cta { width: 100%; }
  .hero__cta .btn { flex: 1; justify-content: center; }
  .risk-row { grid-template-columns: 1fr; }
  .risk-row .risk { border-right: 0; }
  .risk-row .ctrl { background: var(--bg); }
}

/* ---------- 21. reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
  .card:hover { transform: none; }
}

/* =====================================================================
   v2 公司级新增组件（链席文化·文化×科技公司官网）
   token / 通用组件全部沿用 v1，下面只加新分区组件
   ===================================================================== */

/* ---------- Hero v2：文化×科技展示面板 ---------- */
.hero__showcase {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  background: var(--ink); color: #fff; min-height: 380px;
  box-shadow: var(--shadow-lg);
  display: flex; flex-direction: column; justify-content: space-between;
  padding: 30px;
  background-image:
    radial-gradient(circle at 80% 18%, rgba(13,148,136,.30), transparent 46%),
    radial-gradient(circle at 18% 88%, rgba(215,168,75,.18), transparent 42%);
}
.hero__showcase .sc-pattern {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background: url("assets/lianxi-culture-pattern.svg") center / 100% no-repeat;
  opacity: .12; mix-blend-mode: screen;
}
.hero__showcase > * { position: relative; z-index: 1; }
.hero__showcase .sc-mark { height: 34px; }
.hero__showcase .sc-mark img { height: 34px; }
.hero__sc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 22px 0; }
.hero__sc-item {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius-sm); padding: 14px 16px;
}
.hero__sc-item .t { font-size: 14.5px; font-weight: 600; color: #fff; }
.hero__sc-item .d { font-size: 12px; color: #AEB8CC; margin-top: 3px; }
.hero__sc-item.is-flag { border-color: var(--gold); background: rgba(215,168,75,.12); }
.hero__sc-item.is-flag .t::after { content: "旗舰"; font-size: 10px; font-weight: 700; color: var(--ink); background: var(--gold); border-radius: 4px; padding: 1px 6px; margin-left: 8px; vertical-align: middle; }
.hero__sc-foot { font-size: 12.5px; color: #C3CCDC; border-top: 1px solid rgba(255,255,255,.14); padding-top: 14px; }
.hero__sc-foot b { color: #fff; }
.hero h1 .hl-gold { color: var(--gold); }
.hero h1 .hl-chain { color: var(--chain); }

/* ---------- S2 理念：链·席·文化释义 ---------- */
.creed { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 8px; }
.creed__item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; border-top: 3px solid var(--gold); box-shadow: var(--shadow); }
.creed__zi { font-size: 40px; font-weight: 760; color: var(--ink); line-height: 1; margin-bottom: 12px; }
.creed__item h3 { font-size: 17px; margin-bottom: 6px; }
.creed__item p { font-size: 14.5px; color: var(--text-muted); }

/* ---------- S3 业务板块：2×2 大卡 ---------- */
.biz-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.biz-card {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 34px 32px; box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease; overflow: hidden;
}
.biz-card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 5px; }
.biz-card.warm::before { background: linear-gradient(90deg, var(--gold), #E7C988); }
.biz-card.cool::before { background: linear-gradient(90deg, var(--chain), #4FB3A8); }
.biz-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.biz-card.is-flagship { border-color: var(--gold); }
.biz-card__flag { position: absolute; top: 18px; right: 18px; font-size: 11px; font-weight: 700; color: var(--ink); background: var(--gold); padding: 3px 10px; border-radius: 999px; }
.biz-card__ic { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 18px; }
.biz-card.warm .biz-card__ic { background: var(--gold-tint); color: #B8862E; }
.biz-card.cool .biz-card__ic { background: var(--chain-tint); color: var(--chain); }
.biz-card__ic svg { width: 28px; height: 28px; }
.biz-card h3 { font-size: 21px; margin-bottom: 8px; }
.biz-card__desc { color: var(--text-muted); font-size: 15.5px; margin-bottom: 16px; }
.biz-card__kw { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.biz-card__kw span { font-size: 12.5px; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 999px; padding: 4px 12px; }
.biz-card__link { font-size: 14.5px; font-weight: 600; color: var(--chain); display: inline-flex; align-items: center; gap: 6px; }
.biz-card__link .arrow { transition: transform .18s; }
.biz-card__link:hover .arrow { transform: translateX(3px); }

/* ---------- S4 旗舰案例 ---------- */
.flagship { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: stretch; }
.flagship__media {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  background: var(--ink); min-height: 340px; display: grid; place-items: center; text-align: center;
  background-image:
    radial-gradient(circle at 75% 22%, rgba(13,148,136,.26), transparent 48%),
    radial-gradient(circle at 22% 82%, rgba(215,168,75,.20), transparent 46%);
}
.flagship__media .fm-pattern { position: absolute; inset: 0; background: url("assets/lianxi-culture-pattern.svg") center / 420px no-repeat; opacity: .12; mix-blend-mode: screen; }
.flagship__media .fm-inner { position: relative; z-index: 1; padding: 30px; }
.flagship__media .fm-tag { display: inline-block; font-size: 12px; font-weight: 700; color: var(--ink); background: var(--gold); border-radius: 999px; padding: 5px 14px; margin-bottom: 16px; }
.flagship__media .fm-title { font-size: 22px; font-weight: 720; color: #fff; line-height: 1.4; }
.flagship__media .fm-sub { font-size: 13px; color: #C3CCDC; margin-top: 10px; }
.flagship__body { display: flex; flex-direction: column; justify-content: center; }
.flagship__eyebrow { font-size: 13px; font-weight: 700; letter-spacing: .04em; color: var(--chain); margin-bottom: 8px; }
.flagship__body h3 { font-size: clamp(22px,2.6vw,28px); line-height: 1.35; margin-bottom: 8px; }
.flagship__body .sub { font-size: 16px; color: var(--text-muted); margin-bottom: 20px; }
.fs-fields { display: grid; gap: 16px; margin-bottom: 24px; }
.fs-field { border-left: 2px solid var(--border); padding-left: 16px; }
.fs-field dt { font-size: 13px; font-weight: 700; color: var(--ink); margin-bottom: 3px; }
.fs-field dd { margin: 0; font-size: 14.5px; color: var(--text-muted); line-height: 1.6; }
.todo-tag { display: inline-block; font-size: 11.5px; font-weight: 600; color: #B8862E; background: var(--gold-tint); border: 1px solid #EAD9AE; border-radius: 6px; padding: 1px 8px; margin-left: 4px; }

/* ---------- S5 能力 + 场景网格 ---------- */
.cap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-bottom: 48px; }
.cap-item { display: flex; gap: 14px; align-items: flex-start; padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.cap-item__ic { flex: none; width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; background: var(--chain-tint); color: var(--chain); }
.cap-item__ic svg { width: 22px; height: 22px; }
.cap-item h4 { font-size: 16px; font-weight: 600; color: var(--ink); margin: 2px 0 4px; }
.cap-item p { font-size: 13.5px; color: var(--text-muted); }
.scene-note { font-size: 13px; color: var(--text-muted); margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.scene-note::before { content: "应用示意"; font-size: 11px; font-weight: 700; color: #B8862E; background: var(--gold-tint); border: 1px solid #EAD9AE; border-radius: 6px; padding: 2px 8px; }
.scene-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.scene-fig { position: relative; margin: 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow); background: var(--paper); }
.scene-fig img { width: 100%; aspect-ratio: 3/2; object-fit: cover; display: block; }
.scene-ph {
  width: 100%; aspect-ratio: 3/2; display: grid; place-items: center; text-align: center;
  background: var(--ink);
  background-image:
    radial-gradient(circle at 78% 22%, rgba(13,148,136,.26), transparent 48%),
    radial-gradient(circle at 22% 82%, rgba(215,168,75,.18), transparent 46%),
    url("assets/lianxi-culture-pattern.svg");
  background-size: cover, cover, 280px;
  background-blend-mode: normal, normal, soft-light;
}
.scene-ph .ph-t { position: relative; z-index: 1; color: #fff; font-size: 15px; font-weight: 600; letter-spacing: .02em; }
.scene-ph .ph-s { position: relative; z-index: 1; color: #C3CCDC; font-size: 12px; margin-top: 4px; }
.scene-fig figcaption { position: absolute; top: 10px; left: 10px; font-size: 11px; font-weight: 700; color: var(--ink); background: rgba(255,255,255,.92); border-radius: 6px; padding: 3px 9px; box-shadow: var(--shadow); }
.scene-fig .cap-label { padding: 12px 14px; font-size: 13px; color: var(--text-muted); background: var(--surface); }

/* ---------- S6 ABS 降级纵深区 ---------- */
.abs-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; margin-bottom: 28px; }
.abs-points { display: grid; gap: 14px; }
.abs-point { display: flex; gap: 14px; align-items: flex-start; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; }
.abs-point .k { font-family: var(--font-en); font-weight: 760; color: var(--chain); font-size: 15px; flex: none; }
.abs-point .v h4 { font-size: 15.5px; font-weight: 600; color: var(--ink); margin: 0 0 2px; }
.abs-point .v p { font-size: 13.5px; color: var(--text-muted); margin: 0; }
.abs-redline { font-size: 13px; color: var(--text-muted); margin-top: 18px; }
.abs-redline b { color: var(--ink); }
.abs-details { margin-top: 8px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); overflow: hidden; }
.abs-details > summary {
  list-style: none; cursor: pointer; padding: 18px 24px; font-size: 16px; font-weight: 600; color: var(--ink);
  display: flex; align-items: center; justify-content: space-between; gap: 12px; background: var(--bg);
}
.abs-details > summary::-webkit-details-marker { display: none; }
.abs-details > summary .chev { transition: transform .2s; color: var(--chain); font-family: var(--font-en); }
.abs-details[open] > summary .chev { transform: rotate(180deg); }
.abs-details__body { padding: 28px 24px; }
.abs-details__body > * + * { margin-top: 28px; }

/* ---------- S7 关于 ---------- */
.about2 { display: grid; grid-template-columns: 1.4fr .6fr; gap: 48px; align-items: center; }
.about2 p + p { margin-top: 14px; }
.about2 .mission { font-size: 19px; font-weight: 600; color: var(--ink); border-left: 3px solid var(--chain); padding-left: 16px; margin-top: 20px; }
.about2__card { text-align: center; background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px 24px; }
.about2__card img { width: 88px; margin: 0 auto 16px; }
.about2__card .nm { font-size: 15px; font-weight: 600; color: var(--ink); }
.about2__card .en { font-size: 12px; color: var(--chain); letter-spacing: .06em; margin-top: 2px; }
.about2__card .ent { font-size: 12.5px; color: var(--text-muted); margin-top: 10px; }

/* ---------- 响应式（v2 新增组件） ---------- */
@media (max-width: 1023px) {
  .biz-grid { grid-template-columns: 1fr; }
  .flagship, .abs-intro, .about2 { grid-template-columns: 1fr; gap: 28px; }
  .cap-grid, .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .hero__sc-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 767px) {
  .creed, .cap-grid, .scene-grid { grid-template-columns: 1fr; }
  .about2__card { order: -1; }
}