/* ============================================================
   CoAudit.com.cn 官网 · 设计系统 v2 —— 「精密账本 Precision Ledger」
   概念：审计工作台的严谨感 → 深墨蓝 + 纸白 + 等宽数字 + 发丝网格线
   品牌主色保持中蓝 #2f6b9e；强调色沿用审计语义（amber 待处理 / green 采纳 / red 异常）
   ============================================================ */

/* ---------- 品牌令牌 ---------- */
:root {
  /* 文字 */
  --ink:        #0d1b28;   /* 标题（深墨蓝） */
  --ink-2:      #1e3347;
  --body:       #44586c;
  --muted:      #7b8da0;

  /* 背景 / 边框 */
  --paper:      #f5f7fa;
  --surface:    #ffffff;
  --line:       #e4eaf0;
  --line-2:     #d2dce6;

  /* 主色：中蓝 */
  --primary-50:  #eef6fc;
  --primary-100: #e3eef8;
  --primary-200: #c5ddf0;
  --primary-300: #a3c9e4;
  --primary-400: #5b93c6;
  --primary-500: #3d7ab8;
  --primary-600: #2f6b9e;
  --primary-700: #265a85;
  --primary-800: #1d4a6f;
  --primary-900: #143652;

  /* 深色区（Hero / CTA / 页脚） */
  --navy-950: #081521;
  --navy-900: #0b1c2c;
  --navy-800: #10263a;
  --navy-700: #16334c;

  /* 审计语义色（小面积） */
  --amber:    #d97706;
  --amber-bg: #fff6e5;
  --green:    #128a55;
  --green-bg: #e8f7ef;
  --red:      #cf3a3a;
  --red-bg:   #fdeeee;

  /* 沉入背景（表头/底色） */
  --sunken:    #f0f2f5;

  /* 圆角 / 阴影 */
  --radius:    10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(13,27,40,.05);
  --shadow-md: 0 8px 24px rgba(13,27,40,.08);
  --shadow-lg: 0 28px 64px rgba(13,27,40,.16);

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Mono', 'JetBrains Mono',
               Consolas, 'Roboto Mono', monospace;

  --header-h: 68px;
  --container: 1140px;
}

/* ---------- 基础 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  color: var(--body);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--primary-600); text-decoration: none; }
a:hover { color: var(--primary-700); text-decoration: underline; }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.28; letter-spacing: -.015em; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

.num, .mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: 0; }

/* 通用渐现动画（配合 .reveal） */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: none; }
}
.js .reveal { opacity: 0; }
.js .reveal.in { animation: fadeUp .6s cubic-bezier(.22,.61,.36,1) forwards; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; }
  .js .reveal.in { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(245,247,250,.86);
  backdrop-filter: blur(12px) saturate(1.4);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, box-shadow .25s;
}
.site-header.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 1px 0 rgba(13,27,40,.03), 0 8px 24px rgba(13,27,40,.05);
}
.header-inner {
  max-width: var(--container); margin: 0 auto; padding: 0 24px;
  height: var(--header-h);
  display: flex; align-items: center; gap: 26px;
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand img { height: 30px; width: auto; }
.brand-name {
  font-size: 17px; font-weight: 800; color: var(--ink); letter-spacing: -.02em;
}
.brand-name .domain { color: var(--muted); font-weight: 500; font-size: 12.5px; margin-left: 3px; letter-spacing: 0; }
.main-nav { display: flex; align-items: center; gap: 2px; flex: 1; }
.nav-link {
  position: relative; display: inline-flex; align-items: center;
  padding: 7px 15px; font-size: 14.5px; font-weight: 500; color: var(--body);
  border-radius: 8px; transition: color .15s, background .15s;
}
.nav-link:hover { color: var(--primary-700); background: var(--primary-50); text-decoration: none; }
.nav-link.active { color: var(--primary-700); font-weight: 600; background: var(--primary-50); }
.nav-link.active::after {
  content: ""; position: absolute; left: 15px; right: 15px; bottom: 2px;
  height: 2px; border-radius: 2px; background: var(--primary-500);
}
.nav-toggle {
  display: none; border: 1px solid var(--line-2); background: var(--surface);
  border-radius: 10px; width: 42px; height: 42px; cursor: pointer;
  font-size: 17px; color: var(--ink); align-items: center; justify-content: center;
}
@media (max-width: 920px) {
  .nav-toggle { display: flex; margin-left: auto; }
  .main-nav {
    position: absolute; top: var(--header-h); left: 0; right: 0;
    background: var(--surface); border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; padding: 14px 20px 18px;
    display: none; box-shadow: var(--shadow-md);
  }
  .main-nav.open { display: flex; }
  .nav-link { padding: 12px 12px; }
  .nav-link.active::after { display: none; }
  /* 移动端导航：按钮已随"联系页移除"一并删除 */
  .header-inner { gap: 12px; }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 11px 24px; border-radius: 10px;
  font-size: 14.5px; font-weight: 600; cursor: pointer; line-height: 1.4;
  border: 1px solid transparent;
  transition: transform .15s, box-shadow .15s, background .15s, border-color .15s, color .15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary-600); color: #fff; border-color: var(--primary-600); box-shadow: 0 4px 14px rgba(47,107,158,.28); }
.btn-primary:hover { background: var(--primary-700); color: #fff; text-decoration: none; box-shadow: 0 6px 18px rgba(47,107,158,.35); transform: translateY(-1px); }
.btn-outline { background: var(--surface); color: var(--primary-700); border-color: var(--line-2); }
.btn-outline:hover { border-color: var(--primary-400); color: var(--primary-700); text-decoration: none; transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.btn-lg { padding: 14px 32px; font-size: 15.5px; border-radius: 12px; }
.btn-sm { padding: 8px 16px; font-size: 13.5px; }
/* 深色背景上的按钮 */
.btn-white { background: #fff; color: var(--navy-900); border-color: #fff; }
.btn-white:hover { background: var(--primary-100); color: var(--navy-900); text-decoration: none; transform: translateY(-1px); }
.btn-ghost-light { background: transparent; color: #cfe0ee; border-color: rgba(255,255,255,.35); }
.btn-ghost-light:hover { border-color: rgba(255,255,255,.7); color: #fff; text-decoration: none; transform: translateY(-1px); }

/* ---------- Hero（深墨蓝 + 网格 + 辉光） ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(900px 480px at 82% -12%, rgba(93,147,198,.34) 0%, transparent 58%),
    radial-gradient(760px 420px at -8% 22%, rgba(61,122,184,.20) 0%, transparent 55%),
    linear-gradient(180deg, var(--navy-950) 0%, var(--navy-900) 100%);
  color: #dce7f1;
}
/* 发丝网格 */
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(163,201,228,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(163,201,228,.07) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(1100px 600px at 50% 0%, #000 30%, transparent 75%);
          mask-image: radial-gradient(1100px 600px at 50% 0%, #000 30%, transparent 75%);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.04 0'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
}
.hero-inner {
  position: relative; z-index: 1;
  max-width: var(--container); margin: 0 auto;
  padding: 96px 24px 84px;
  display: grid; grid-template-columns: 1.05fr .95fr;
  gap: 56px; align-items: center;
}
.hero-copy .eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .14em;
  color: var(--primary-300);
  border: 1px solid rgba(163,201,228,.28);
  background: rgba(20,54,82,.35);
  padding: 7px 16px; border-radius: 99px; margin-bottom: 28px;
}
.eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--primary-300); box-shadow: 0 0 0 4px rgba(163,201,228,.15); }
.hero h1 {
  font-size: clamp(36px, 5vw, 58px);
  font-weight: 800; letter-spacing: -.03em; line-height: 1.12;
  color: #fff; margin-bottom: 20px;
}
.hero h1 .hl {
  color: var(--primary-300);
  background: linear-gradient(120deg, #a3c9e4, #5b93c6);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead { font-size: 16.5px; color: #a9bdd0; max-width: 520px; margin-bottom: 36px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
/* Hero 口号徽章 */
.hero-badges { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 30px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .02em;
  color: #cfe0ee; border: 1px solid rgba(163,201,228,.25);
  background: rgba(20,54,82,.35);
  padding: 8px 16px; border-radius: 99px;
  transition: border-color .15s, background .15s;
}
.hero-badge:hover { border-color: rgba(163,201,228,.5); background: rgba(20,54,82,.55); }
.hero-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--primary-300); box-shadow: 0 0 0 3px rgba(163,201,228,.12); }

/* Hero 产品界面截图位 */
.hero-shot {
  background: var(--surface);
  border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255,255,255,.14);
  transform: rotate(1.2deg);
  transition: transform .4s cubic-bezier(.22,.61,.36,1);
}
.hero-shot:hover { transform: rotate(0deg) translateY(-4px); }
.hero-shot img { width: 100%; display: block; aspect-ratio: 4/3; object-fit: cover; }
.hero-shot-ph {
  aspect-ratio: 4/3; width: 100%;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  background:
    linear-gradient(rgba(61,122,184,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61,122,184,.08) 1px, transparent 1px),
    linear-gradient(150deg, var(--primary-100), var(--surface) 55%, #eef6fc);
  background-size: 44px 44px, 44px 44px, 100% 100%;
  color: var(--muted);
}
.hero-shot-ph svg { width: 46px; height: 46px; color: var(--primary-400); margin-bottom: 4px; }
.hero-shot-ph .ph-title { font-size: 14px; font-weight: 700; color: var(--primary-700); letter-spacing: .02em; }
.hero-shot-ph .ph-sub { font-size: 12px; color: var(--muted); }

/* 标签（复用） */
.tag {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 2px 10px; border-radius: 99px;
  font-size: 11.5px; font-weight: 600; font-family: var(--font-sans);
}
.tag .t-dot { width: 5px; height: 5px; border-radius: 50%; }
.tag-blue { background: var(--primary-100); color: var(--primary-700); }
.tag-blue .t-dot { background: var(--primary-500); }
.tag-green { background: var(--green-bg); color: var(--green); }
.tag-green .t-dot { background: var(--green); }
.tag-yellow { background: var(--amber-bg); color: var(--amber); }
.tag-yellow .t-dot { background: var(--amber); }
.tag-red { background: var(--red-bg); color: var(--red); }
.tag-red .t-dot { background: var(--red); }
.tag-gray { background: var(--paper); color: var(--body); border: 1px solid var(--line); }

/* ---------- 数据条 ---------- */
.stat-band { border-bottom: 1px solid var(--line); background: var(--surface); }
.stat-grid {
  max-width: var(--container); margin: 0 auto; padding: 34px 24px;
  display: grid; grid-template-columns: repeat(4, 1fr);
}
.stat {
  position: relative; text-align: center; padding: 0 18px;
}
.stat:not(:last-child)::after {
  content: ""; position: absolute; right: 0; top: 8px; bottom: 8px;
  width: 1px; background: var(--line);
}
.stat .v {
  font-family: var(--font-mono); font-size: 34px; font-weight: 700;
  color: var(--primary-600); letter-spacing: -.02em; line-height: 1.1;
}
.stat .k { font-size: 13px; color: var(--muted); margin-top: 6px; }
@media (max-width: 720px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 24px 0; padding: 28px 24px; }
  .stat:nth-child(2)::after { display: none; }
}

/* ---------- 区块 ---------- */
.section { padding: 64px 0; }
.section.alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 780px; margin: 0 auto 40px; }
.section-head.center { text-align: center; }
.section-head .kicker {
  display: inline-flex; align-items: baseline; gap: 10px;
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 600;
  letter-spacing: .16em; color: var(--primary-600); text-transform: uppercase;
  margin-bottom: 14px;
}
.section-head .kicker .idx { color: var(--primary-300); font-weight: 500; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 36px); font-weight: 800; letter-spacing: -.025em; margin-bottom: 14px; }
.section-head p { color: var(--muted); font-size: 15.5px; }
.section-head.center .kicker { justify-content: center; }

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 30px 28px;
  transition: transform .2s cubic-bezier(.22,.61,.36,1), box-shadow .2s, border-color .2s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-200);
}
/* 技术图纸式角标 */
.card::before, .card::after {
  content: ""; position: absolute; width: 14px; height: 14px;
  border: 2px solid var(--primary-200); opacity: 0; transition: opacity .2s;
  pointer-events: none;
}
.card::before { top: -1px; left: -1px; border-right: none; border-bottom: none; border-top-left-radius: var(--radius-lg); }
.card::after  { bottom: -1px; right: -1px; border-left: none; border-top: none; border-bottom-right-radius: var(--radius-lg); }
.card:hover::before, .card:hover::after { opacity: 1; }
.card .idx {
  font-family: var(--font-mono); font-size: 12px; color: var(--primary-400);
  letter-spacing: .12em; margin-bottom: 14px; display: block;
}
.card .icon {
  width: 46px; height: 46px; border-radius: 12px;
  background: var(--primary-50); color: var(--primary-600);
  border: 1px solid var(--primary-100);
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.card .icon svg { width: 22px; height: 22px; }
.card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.card h3 .idx { display: inline-block; margin-bottom: 0; margin-right: 9px; font-size: 12px; font-weight: 600; color: var(--primary-400); letter-spacing: .1em; vertical-align: 2px; }
.card p { font-size: 14px; color: var(--body); }
.card p strong { color: var(--ink); font-weight: 600; }

.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* ---------- 工作流 ---------- */
.flow { max-width: 980px; margin: 0 auto; }
.flow-steps {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: var(--surface); overflow: hidden; box-shadow: var(--shadow-sm);
}
.flow-step {
  position: relative; padding: 28px 24px 26px;
  border-right: 1px solid var(--line);
  transition: background .2s;
}
.flow-step:last-child { border-right: none; }
.flow-step:hover { background: var(--primary-50); }
.flow-step .step-no {
  font-family: var(--font-mono); font-size: 12px; color: var(--primary-400);
  letter-spacing: .14em; display: block; margin-bottom: 10px;
}
.flow-step::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(180deg, var(--primary-500), var(--primary-200));
  opacity: 0; transition: opacity .2s;
}
.flow-step:hover::before { opacity: 1; }
.flow-step h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.flow-step p { font-size: 13px; color: var(--body); }
@media (max-width: 880px) {
  .flow-steps { grid-template-columns: 1fr 1fr; }
  .flow-step:nth-child(2) { border-right: none; }
  .flow-step:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}
@media (max-width: 560px) { .flow-steps { grid-template-columns: 1fr; } .flow-step { border-right: none; border-bottom: 1px solid var(--line); } .flow-step:last-child { border-bottom: none; } }

/* ---------- 能力版图（产品页，保留神秘性：只展代表性能力） ---------- */
.cap-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.cap-block {
  position: relative; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 34px 30px; overflow: hidden;
  transition: transform .2s cubic-bezier(.22,.61,.36,1), box-shadow .2s, border-color .2s;
}
.cap-block:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--primary-200); }
.cap-block::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary-500), var(--primary-200));
  opacity: .75;
}
.cap-block .cap-no {
  font-family: var(--font-mono); font-size: 12px; color: var(--primary-400);
  letter-spacing: .16em; display: block; margin-bottom: 12px;
}
.cap-block h3 { font-size: 19px; font-weight: 800; margin-bottom: 10px; letter-spacing: -.02em; }
.cap-block .cap-desc { font-size: 14px; color: var(--body); margin-bottom: 18px; }
.cap-block .cap-desc strong { color: var(--ink); font-weight: 600; }
.cap-block .cap-tags { display: flex; gap: 8px; flex-wrap: wrap; }
@media (max-width: 860px) { .cap-grid { grid-template-columns: 1fr; } }

/* ---------- 对照表 ---------- */
.table-wrap {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm);
  overflow-x: auto;
}
table.audit-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 800px; }
.audit-table th {
  text-align: left; font-size: 12px; color: var(--muted); font-weight: 700;
  letter-spacing: .06em; padding: 13px 20px;
  background: var(--paper); border-bottom: 1px solid var(--line-2);
  white-space: nowrap;
}
.audit-table td {
  padding: 17px 20px; border-bottom: 1px solid var(--line);
  color: var(--body); vertical-align: top; line-height: 1.75;
}
.audit-table tr:last-child td { border-bottom: none; }
.audit-table tbody tr { transition: background .15s; }
.audit-table tbody tr:hover { background: var(--primary-50); }
.audit-table td strong { color: var(--ink); }
.audit-table .req-col { width: 33%; }
.audit-table .resp-col { width: 42%; }

/* ---------- 小方块 bullet 列表（缩进） ---------- */
.sq-list { list-style: none; margin: 10px 0 0; padding: 0; }
.sq-list li { position: relative; padding: 5px 0 5px 28px; font-size: 14px; color: var(--body); line-height: 1.7; }
.sq-list li::before { content: ""; position: absolute; left: 5px; top: 14px; width: 5px; height: 5px; background: var(--primary-300); }
.sq-list li strong { color: var(--ink); font-weight: 600; margin-right: 4px; }

/* ---------- 要点列表 ---------- */
.check-list { list-style: none; }
.check-list li {
  padding: 10px 0 10px 32px; position: relative; font-size: 14.5px; color: var(--body);
}
.check-list li::before {
  content: ""; position: absolute; left: 0; top: 16px;
  width: 19px; height: 19px; border-radius: 6px;
  background: var(--green-bg); border: 1px solid #b9e3cd;
}
.check-list li::after {
  content: "✓"; position: absolute; left: 0; top: 10px; width: 19px;
  text-align: center; font-size: 11.5px; color: var(--green); font-weight: 800;
}
.check-list li strong { color: var(--ink); }

/* ---------- 提示条 ---------- */
.notice {
  border: 1px solid var(--primary-100);
  background: linear-gradient(90deg, var(--primary-50), rgba(238,246,252,.5));
  border-radius: var(--radius); padding: 18px 22px;
  font-size: 14px; color: var(--body);
  max-width: 900px; margin: 34px auto 0;
}
.notice strong { color: var(--primary-800); }
.notice a { font-weight: 600; }
/* 配套公开资料有序列表 */
.src-list { list-style: none; margin-top: 12px; counter-reset: src; }
.src-list li { counter-increment: src; padding: 5px 0 5px 30px; position: relative; font-size: 13.5px; }
.src-list li::before {
  content: counter(src); position: absolute; left: 0; top: 6px;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--primary-100); color: var(--primary-700);
  font-family: var(--font-mono); font-size: 11px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
/* 表格下方小字说明 */
.table-note { margin: 14px auto 0; max-width: 860px; font-size: 12.5px; color: var(--muted); text-align: center; }
/* 满宽引导段（替代 section-head 窄副句的长介绍） */
.lead-intro { max-width: 100%; margin: -14px auto 36px; text-align: center; font-size: 15.5px; color: var(--body); line-height: 1.8; }
/* 愿景金句（字体与卡片标题 h3 一致） */
.vision { text-align: center; font-size: 17px; font-weight: 700; color: var(--primary-700); letter-spacing: -.01em; line-height: 1.7; padding: 16px 0 4px; }
.notice.warn { border-color: #f3d9a4; background: linear-gradient(90deg, var(--amber-bg), rgba(255,246,229,.5)); color: #7c5510; }
.notice.warn strong { color: #8a5b00; }

/* ---------- CTA ---------- */
.cta-band {
  position: relative; overflow: hidden;
  background:
    radial-gradient(700px 400px at 88% -20%, rgba(93,147,198,.35) 0%, transparent 60%),
    radial-gradient(600px 360px at 0% 110%, rgba(61,122,184,.22) 0%, transparent 55%),
    linear-gradient(180deg, var(--navy-900), var(--navy-950));
  color: #dce7f1; text-align: center; padding: 40px 24px;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(163,201,228,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(163,201,228,.06) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(800px 500px at 50% 50%, #000 20%, transparent 80%);
          mask-image: radial-gradient(800px 500px at 50% 50%, #000 20%, transparent 80%);
}
.cta-band .inner { position: relative; z-index: 1; max-width: 720px; margin: 0 auto; }
.cta-band .kicker {
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .18em;
  color: var(--primary-300); margin-bottom: 16px;
}
.cta-band h2 { color: #fff; font-size: clamp(24px, 3.4vw, 34px); font-weight: 800; letter-spacing: -.02em; margin-bottom: 14px; }
.cta-band p { color: #a9bdd0; max-width: 560px; margin: 0 auto 32px; font-size: 15.5px; }
.cta-band .hero-cta { justify-content: center; }

/* ---------- 页脚（水平一行：品牌 · 版权 · 联系方式） ---------- */
.site-footer { background: var(--navy-950); color: #93a8bb; font-size: 13.5px; }
.footer-inner {
  max-width: var(--container); margin: 0 auto; padding: 26px 24px;
  display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap;
  text-align: center;
}
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand img { height: 24px; width: auto; }
.footer-brand .fb-name { font-size: 14.5px; font-weight: 700; color: #fff; letter-spacing: -.01em; }
.footer-copy { font-family: var(--font-mono); font-size: 12px; color: #5f768b; }
.footer-mail { font-family: var(--font-mono); font-size: 12px; color: #a9bdd0; transition: color .15s; }
.footer-mail:hover { color: #fff; }
.footer-icp { display: inline-flex; align-items: center; gap: 5px; font-family: var(--font-mono); font-size: 12px; color: #5f768b; transition: color .15s; }
.footer-icp svg { width: 13px; height: 13px; flex-shrink: 0; }
.footer-icp img { height: 16px; width: auto; flex-shrink: 0; display: block; }
.footer-icp .icp-ico { color: #8a99a8; }
.footer-icp:hover { color: #fff; }
.footer-icp:hover svg { color: currentColor; }
/* 备案信息独立一行（ICP 备案号 / 公网安备号并排） */
.footer-legal { flex-basis: 100%; display: flex; justify-content: center; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 2px; }
.footer-inner .sep { color: #4a6178; font-size: 12px; }

/* ---------- Hero 响应式 ---------- */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; padding: 72px 24px 64px; }
  .hero-shot { max-width: 520px; transform: none; }
  .hero-shot:hover { transform: translateY(-4px); }
}

/* ---------- 页头（内页） ---------- */
.page-head {
  position: relative; overflow: hidden;
  background:
    radial-gradient(720px 360px at 90% -30%, rgba(93,147,198,.16) 0%, transparent 60%),
    var(--surface);
  border-bottom: 1px solid var(--line);
}
.page-head::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(61,122,184,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61,122,184,.05) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(700px 400px at 50% 0%, #000 20%, transparent 75%);
          mask-image: radial-gradient(700px 400px at 50% 0%, #000 20%, transparent 75%);
}
.page-head-inner { position: relative; max-width: var(--container); margin: 0 auto; padding: 52px 24px 40px; }
.page-head .kicker {
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 600;
  letter-spacing: .16em; color: var(--primary-600);
  text-transform: uppercase; margin-bottom: 14px; display: block;
}
.page-head h1 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; letter-spacing: -.025em; margin-bottom: 12px; }
.page-head p { color: var(--muted); font-size: 15.5px; max-width: 100%; }

/* ---------- 其它 ---------- */
.prose { max-width: 860px; margin: 0 auto; }
.prose h2 { font-size: 23px; font-weight: 800; margin: 52px 0 16px; letter-spacing: -.02em; }
.prose h3 { font-size: 17px; font-weight: 700; margin: 32px 0 10px; }
.prose p { margin-bottom: 15px; color: var(--body); }
.prose p strong { color: var(--ink); }
.prose .src { font-size: 12.5px; color: var(--muted); }
.prose ul { list-style: none; margin-bottom: 15px; }
.prose ul li { padding: 6px 0 6px 28px; position: relative; color: var(--body); }
.prose ul li::before {
  content: ""; position: absolute; left: 2px; top: 16px;
  width: 6px; height: 6px; border-radius: 2px; background: var(--primary-400);
}

:focus-visible { outline: 2px solid var(--primary-500); outline-offset: 2px; }

/* ---------- 技术架构（分层文字结构） ---------- */
.arch-text { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.at-layer { border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); padding: 14px 18px 12px; box-shadow: var(--shadow-sm); }
.at-layer h4 { font-size: 14px; font-weight: 800; color: var(--ink); margin-bottom: 6px; display: flex; align-items: center; gap: 9px; }
.at-layer h4::before { content: ""; width: 8px; height: 8px; border-radius: 2px; flex-shrink: 0; }
.at-app h4::before { background: var(--primary-600); }
.at-cap h4::before { background: var(--primary-400); }
.at-infra h4::before { background: #64748b; }
.at-sec h4::before { background: var(--amber); }
.at-layer .at-meta { margin-left: auto; font-family: var(--font-mono); font-size: 11.5px; font-weight: 600; color: var(--muted); letter-spacing: .04em; white-space: nowrap; }
.at-layer ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 2px 28px; }
.at-layer ul li { position: relative; padding: 3.5px 0 3.5px 20px; font-size: 13.5px; color: var(--body); line-height: 1.65; }
.at-layer ul li::before { content: ""; position: absolute; left: 4px; top: 12px; width: 6px; height: 6px; border-radius: 2px; background: var(--primary-300); }
.at-layer ul li strong { color: var(--ink); font-weight: 600; margin-right: 4px; }
@media (max-width: 640px) {
  .at-layer ul { grid-template-columns: 1fr; }
}

/* ---------- 移动端专项适配 ---------- */
@media (max-width: 720px) {
  .section { padding: 48px 0; }
  .stat .v { font-size: 26px; }
  .hero h1 { font-size: clamp(30px, 8vw, 40px); }
}
@media (max-width: 640px) {
  .page-head-inner { padding: 44px 24px 36px; }
  /* 区块标题缩小，避免移动端折行 */
  .section-head h2 { font-size: 21px; letter-spacing: -.015em; }
  .hero-inner { padding: 56px 24px 48px; }
  .hero .lead { font-size: 15px; margin-bottom: 28px; }
  .hero-badges { gap: 8px; margin-top: 24px; }
  .hero-badge { padding: 7px 13px; font-size: 11.5px; }
  .cta-band { padding: 32px 20px; }
}
@media (max-width: 560px) {
  /* Hero 流水勾稽示意卡：窄屏紧凑化 */
  .hero-shot { max-width: 100%; }
  .flow-step { padding: 22px 18px; }
}