/* ==========================================================================
   鼎天国际官网 — 全站样式表
   Static site. No frameworks. No remote fonts. No remote assets.
   ========================================================================== */

:root {
  --color-ink: #0b1220;
  --color-navy-900: #0a1a33;
  --color-navy-800: #0f2547;
  --color-navy-700: #15325f;
  --color-navy-600: #1c3f78;
  --color-navy-100: #e7ecf5;
  --color-navy-050: #f4f7fb;
  --color-teal-600: #0e7c86;
  --color-teal-500: #12969f;
  --color-teal-100: #e0f3f4;
  --color-gold-600: #a97c1f;
  --color-gold-500: #c9971f;
  --color-gold-100: #f8eed4;
  --color-red-600: #b23b3b;
  --color-red-100: #f7e6e6;
  --color-amber-600: #b2792f;
  --color-amber-100: #f7ecda;
  --color-green-600: #2f7d4f;
  --color-green-100: #e3f2e8;
  --color-gray-900: #1a2233;
  --color-gray-700: #3c4459;
  --color-gray-600: #5a6478;
  --color-gray-400: #8a93a6;
  --color-gray-200: #d8dce6;
  --color-gray-100: #eef1f6;
  --color-white: #ffffff;

  --font-body: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-serif-display: "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-card: 0 1px 2px rgba(10, 26, 51, 0.06), 0 8px 24px rgba(10, 26, 51, 0.06);
  --shadow-pop: 0 12px 32px rgba(10, 26, 51, 0.14);
  --container-w: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-gray-900);
  background: var(--color-white);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p, figure { margin: 0; }
button { font: inherit; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 20px;
}

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

/* ---------------------------------- 顶部通告条 ---------------------------------- */
.top-notice {
  background: var(--color-navy-900);
  color: var(--color-navy-100);
  font-size: 13px;
  text-align: center;
  padding: 7px 16px;
  letter-spacing: 0.02em;
}

/* ---------------------------------- 头部导航 ---------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--color-gray-200);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 19px;
  color: var(--color-navy-900);
}
.brand img { width: 34px; height: 34px; }
.brand small {
  display: block;
  font-weight: 400;
  font-size: 11px;
  color: var(--color-gray-600);
  letter-spacing: 0.02em;
}
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-sm);
  width: 42px;
  height: 38px;
  position: relative;
}
.nav-toggle span, .nav-toggle::before, .nav-toggle::after {
  content: "";
  position: absolute;
  left: 9px; right: 9px;
  height: 2px;
  background: var(--color-navy-900);
}
.nav-toggle::before { top: 12px; }
.nav-toggle span { top: 18px; }
.nav-toggle::after { top: 24px; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.nav-list a {
  display: inline-block;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--color-gray-700);
  font-weight: 500;
}
.nav-list a:hover, .nav-list a[aria-current="page"] {
  background: var(--color-navy-100);
  color: var(--color-navy-900);
}

/* ---------------------------------- Hero ---------------------------------- */
.hero {
  background: linear-gradient(160deg, var(--color-navy-900) 0%, var(--color-navy-700) 62%, var(--color-teal-600) 130%);
  color: var(--color-white);
  padding: 64px 0 72px;
}
.hero .container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.24);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.35;
  font-weight: 800;
  margin-bottom: 18px;
}
.hero p.lead {
  font-size: 16px;
  color: rgba(255,255,255,0.86);
  max-width: 60ch;
}
.hero-actions { display: flex; gap: 12px; margin-top: 26px; flex-wrap: wrap; }
.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 30px;
}
.hero-stats div {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  font-size: 13px;
  color: rgba(255,255,255,0.85);
}
.hero-stats strong { display: block; font-size: 15px; color: #fff; margin-bottom: 3px; }
.hero-art { background: rgba(255,255,255,0.06); border-radius: var(--radius-lg); padding: 18px; border: 1px solid rgba(255,255,255,0.14); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  border: 1px solid transparent;
}
.btn--primary { background: var(--color-gold-500); color: var(--color-navy-900); }
.btn--primary:hover { background: var(--color-gold-600); }
.btn--ghost { border-color: rgba(255,255,255,0.5); color: #fff; }
.btn--ghost:hover { background: rgba(255,255,255,0.12); }
.btn--outline { border-color: var(--color-navy-600); color: var(--color-navy-700); }
.btn--outline:hover { background: var(--color-navy-050); }

/* ---------------------------------- Section 通用 ---------------------------------- */
.section { padding: 62px 0; }
.section--tight { padding: 44px 0; }
.section--alt { background: var(--color-navy-050); }
.section--dark { background: var(--color-navy-900); color: var(--color-navy-100); }
.section-head { max-width: 78ch; margin-bottom: 30px; }
.section-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-teal-600);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.section--dark .section-kicker { color: var(--color-gold-500); }
.section-title { font-size: clamp(22px, 3vw, 30px); font-weight: 800; color: var(--color-navy-900); line-height: 1.4; }
.section--dark .section-title { color: #fff; }
.section-lead { margin-top: 12px; color: var(--color-gray-600); font-size: 15.5px; }
.section--dark .section-lead { color: rgba(255,255,255,0.78); }

/* ---------------------------------- 信息处理链 ---------------------------------- */
.flow-chain {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.flow-chain .node {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--color-navy-800);
  box-shadow: var(--shadow-card);
}
.flow-chain .arrow { color: var(--color-gray-400); font-size: 15px; }
.section--dark .flow-chain .node { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.18); color: #fff; }

/* ---------------------------------- 重点长文章（首页8篇） ---------------------------------- */
.feature-article {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 36px;
  padding: 36px 0;
  border-top: 1px solid var(--color-gray-200);
}
.feature-article:first-of-type { border-top: none; }
.feature-article__meta {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 13px;
  color: var(--color-gray-600);
  margin-bottom: 12px;
}
.feature-article__meta .tag {
  background: var(--color-teal-100);
  color: var(--color-teal-600);
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 12px;
}
.feature-article h3 {
  font-size: clamp(19px, 2.4vw, 23px);
  line-height: 1.5;
  font-weight: 800;
  color: var(--color-navy-900);
  margin-bottom: 14px;
}
.feature-article .excerpt { color: var(--color-gray-700); font-size: 15.5px; }
.feature-article .excerpt p + p { margin-top: 12px; }
.feature-article__aside {
  background: var(--color-navy-050);
  border-radius: var(--radius-lg);
  padding: 16px;
  align-self: start;
}
.feature-article__aside figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--color-gray-600);
  line-height: 1.6;
}
.feature-article__more {
  display: inline-flex;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-teal-600);
}

/* ---------------------------------- 情报观察（首页3篇） ---------------------------------- */
.observation-list { display: grid; gap: 22px; }
.observation {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
}
.observation h3 { font-size: 17px; font-weight: 800; color: var(--color-navy-900); margin-bottom: 10px; line-height: 1.55; }
.observation p { color: var(--color-gray-700); font-size: 15px; }

/* ---------------------------------- 二级页文章摘要卡（首页回流） ---------------------------------- */
.summary-block { margin-bottom: 40px; }
.summary-block__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.summary-block__head h3 { font-size: 20px; font-weight: 800; color: var(--color-navy-900); }
.summary-block__head a { font-size: 13.5px; font-weight: 700; color: var(--color-teal-600); }
@media (max-width: 560px) {
  .summary-block__head { flex-direction: column; align-items: flex-start; }
}
.summary-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.summary-grid.summary-grid--4 { grid-template-columns: repeat(2, 1fr); }
.summary-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.summary-card .cat { font-size: 12px; font-weight: 700; color: var(--color-gold-600); }
.summary-card h4 { font-size: 15.5px; font-weight: 700; color: var(--color-navy-900); line-height: 1.5; }
.summary-card p { font-size: 13.5px; color: var(--color-gray-600); flex: 1; }
.summary-card .read-more { font-size: 13px; font-weight: 700; color: var(--color-teal-600); }

/* ---------------------------------- 徽标 Confirmed / Reported / Assessed ---------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
}
.badge--confirmed { background: var(--color-green-100); color: var(--color-green-600); }
.badge--reported { background: var(--color-navy-100); color: var(--color-navy-700); }
.badge--assessed { background: var(--color-gold-100); color: var(--color-gold-600); }
.badge--disputed { background: var(--color-red-100); color: var(--color-red-600); }
.badge--outdated { background: var(--color-gray-100); color: var(--color-gray-600); }

/* ---------------------------------- 来源树 / 结构表 ---------------------------------- */
.source-tree { border: 1px solid var(--color-gray-200); border-radius: var(--radius-md); overflow: hidden; }
.source-tree table { font-size: 14px; }
.source-tree th, .source-tree td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--color-gray-200); }
.source-tree th { background: var(--color-navy-050); color: var(--color-navy-800); font-size: 12.5px; letter-spacing: 0.03em; }
.source-tree tr:last-child td { border-bottom: none; }
.table-scroll { overflow-x: auto; }

/* ---------------------------------- 事件时间线 ---------------------------------- */
.timeline { position: relative; padding-left: 26px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 4px; bottom: 4px; width: 2px; background: var(--color-gray-200); }
.timeline-item { position: relative; padding-bottom: 26px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute; left: -26px; top: 4px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--color-teal-500);
  border: 3px solid var(--color-teal-100);
}
.timeline-item__row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 6px; }
.timeline-item time { font-size: 12.5px; color: var(--color-gray-600); font-weight: 600; }
.timeline-item h4 { font-size: 15px; font-weight: 700; color: var(--color-navy-900); }
.timeline-item p { font-size: 13.5px; color: var(--color-gray-600); }

/* ---------------------------------- 多语言 Tabs ---------------------------------- */
.lang-tabs__nav { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.lang-tabs__nav button {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-gray-700);
}
.lang-tabs__nav button[aria-selected="true"] { background: var(--color-navy-800); color: #fff; border-color: var(--color-navy-800); }
.tab-panel { display: none; }
.tab-panel[data-active="true"] { display: block; }
.tab-panel .box { background: var(--color-white); border: 1px solid var(--color-gray-200); border-radius: var(--radius-md); padding: 16px 18px; font-size: 14px; color: var(--color-gray-700); }

/* ---------------------------------- 国家风险矩阵 ---------------------------------- */
.risk-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.risk-cell { border: 1px solid var(--color-gray-200); border-radius: var(--radius-md); padding: 16px; }
.risk-cell h4 { font-size: 13.5px; color: var(--color-gray-600); margin-bottom: 8px; }
.risk-cell .val { font-size: 22px; font-weight: 800; color: var(--color-navy-900); }
.risk-cell .delta { font-size: 12.5px; font-weight: 700; }
.risk-cell .delta.up { color: var(--color-red-600); }
.risk-cell .delta.down { color: var(--color-green-600); }
.risk-drivers__nav { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0 14px; }
.risk-drivers__nav button {
  background: var(--color-navy-050); border: 1px solid var(--color-gray-200); border-radius: var(--radius-sm);
  padding: 8px 12px; font-size: 13px; font-weight: 600; color: var(--color-navy-800);
}
.risk-drivers__nav button[aria-selected="true"] { background: var(--color-teal-600); border-color: var(--color-teal-600); color: #fff; }

/* ---------------------------------- 行业过滤漏斗 ---------------------------------- */
.funnel { display: grid; gap: 10px; }
.funnel-row { display: grid; grid-template-columns: 160px 1fr auto; gap: 14px; align-items: center; }
.funnel-row .bar { background: var(--color-navy-100); border-radius: 999px; height: 14px; position: relative; overflow: hidden; }
.funnel-row .bar span { position: absolute; inset: 0; background: var(--color-teal-500); border-radius: 999px; }
.funnel-row .label { font-size: 13.5px; font-weight: 600; color: var(--color-gray-700); }
.funnel-row .num { font-size: 13px; color: var(--color-gray-600); }

/* ---------------------------------- 卡片网格通用 ---------------------------------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.plain-card {
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 20px;
  background: #fff;
}
.plain-card h4 { font-size: 15.5px; font-weight: 700; color: var(--color-navy-900); margin-bottom: 8px; }
.plain-card p { font-size: 13.5px; color: var(--color-gray-600); }
.plain-card .icon { width: 40px; height: 40px; margin-bottom: 12px; }

/* ---------------------------------- 面包屑 ---------------------------------- */
.breadcrumb { font-size: 13px; color: var(--color-gray-600); padding: 16px 0; }
.breadcrumb a { color: var(--color-teal-600); font-weight: 600; }
.breadcrumb span { margin: 0 6px; color: var(--color-gray-400); }

/* ---------------------------------- 页面 Hero（二级页） ---------------------------------- */
.page-hero {
  background: linear-gradient(150deg, var(--color-navy-900), var(--color-navy-700));
  color: #fff;
  padding: 46px 0 54px;
}
.page-hero h1 { font-size: clamp(24px, 3.4vw, 32px); font-weight: 800; line-height: 1.4; margin-bottom: 14px; }
.page-hero p { color: rgba(255,255,255,0.82); max-width: 68ch; font-size: 15.5px; }
.page-hero .flow-chain { margin-top: 22px; }

/* ---------------------------------- 完整文章页内结构（二级页） ---------------------------------- */
.article-full { padding: 40px 0; border-top: 1px solid var(--color-gray-200); }
.article-full:first-of-type { border-top: none; padding-top: 8px; }
.article-full__meta { display: flex; gap: 10px; align-items: center; font-size: 13px; color: var(--color-gray-600); margin-bottom: 10px; flex-wrap: wrap; }
.article-full__meta .tag { background: var(--color-teal-100); color: var(--color-teal-600); padding: 3px 10px; border-radius: 999px; font-weight: 700; font-size: 12px; }
.article-full h2 { font-size: clamp(21px, 2.8vw, 26px); font-weight: 800; color: var(--color-navy-900); line-height: 1.5; margin-bottom: 18px; }
.article-full .figure-inline { margin: 22px 0; background: var(--color-navy-050); border-radius: var(--radius-lg); padding: 18px; }
.article-full .figure-inline figcaption { margin-top: 10px; font-size: 12.5px; color: var(--color-gray-600); }
.article-body p { font-size: 15.5px; color: var(--color-gray-700); margin-bottom: 16px; }
.article-body h3 { font-size: 17px; font-weight: 800; color: var(--color-navy-900); margin: 22px 0 10px; }
.article-body ul, .article-body ol { margin: 10px 0 16px; padding-left: 22px; list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { font-size: 15px; color: var(--color-gray-700); margin-bottom: 6px; }
.pull-note {
  border-left: 3px solid var(--color-gold-500);
  background: var(--color-gold-100);
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-gray-700);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 18px 0;
}

/* ---------------------------------- AI 助手模块 ---------------------------------- */
.assistant-panel {
  background: var(--color-navy-900);
  border-radius: var(--radius-lg);
  padding: 28px;
  color: #fff;
}
.assistant-q { display: grid; gap: 10px; margin-top: 16px; }
.assistant-q button {
  text-align: left;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: rgba(255,255,255,0.92);
  font-size: 14px;
}
.assistant-q button:hover { background: rgba(255,255,255,0.12); }
.assistant-answer {
  margin-top: 16px;
  background: rgba(255,255,255,0.06);
  border: 1px dashed rgba(255,255,255,0.28);
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 13.5px;
  color: rgba(255,255,255,0.85);
  display: none;
}
.assistant-answer[data-show="true"] { display: block; }

/* ---------------------------------- App 展示 ---------------------------------- */
.app-features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.app-feature { border: 1px solid var(--color-gray-200); border-radius: var(--radius-md); padding: 18px; }
.app-feature img { width: 36px; height: 36px; margin-bottom: 10px; }
.app-feature h4 { font-size: 14.5px; font-weight: 700; color: var(--color-navy-900); margin-bottom: 6px; }
.app-feature p { font-size: 13px; color: var(--color-gray-600); }
.app-download { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 24px; }
.app-download .plain-card { text-align: center; }
.app-download .plain-card .status { display: inline-block; margin-top: 8px; font-size: 12.5px; font-weight: 700; color: var(--color-gold-600); background: var(--color-gold-100); padding: 3px 10px; border-radius: 999px; }

/* ---------------------------------- FAQ ---------------------------------- */
.faq-list { border-top: 1px solid var(--color-gray-200); }
.faq-item { border-bottom: 1px solid var(--color-gray-200); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: none;
  border: none;
  padding: 16px 4px;
  text-align: left;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-navy-900);
}
.faq-question::after {
  content: "+";
  font-size: 20px;
  color: var(--color-gray-400);
  flex-shrink: 0;
}
.faq-question[aria-expanded="true"]::after { content: "−"; }
.faq-answer { display: none; padding: 0 4px 18px; font-size: 14.5px; color: var(--color-gray-600); }
.faq-answer[data-open="true"] { display: block; }

/* ---------------------------------- 公司介绍 / 声明 ---------------------------------- */
.about-block { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.notice-box {
  background: var(--color-navy-050);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 13.5px;
  color: var(--color-gray-600);
  margin-top: 14px;
}
.notice-box + .notice-box { margin-top: 10px; }

/* ---------------------------------- Footer ---------------------------------- */
.site-footer { background: var(--color-navy-900); color: rgba(255,255,255,0.7); padding: 46px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 800; font-size: 18px; margin-bottom: 12px; }
.footer-brand img { width: 30px; height: 30px; }
.site-footer h5 { color: #fff; font-size: 13.5px; margin-bottom: 12px; letter-spacing: 0.03em; }
.site-footer ul li { margin-bottom: 9px; font-size: 13.5px; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  margin-top: 34px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.12);
  font-size: 12.5px;
  color: rgba(255,255,255,0.5);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------------------------------- 返回顶部 ---------------------------------- */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-navy-900);
  color: #fff;
  border: none;
  font-size: 18px;
  box-shadow: var(--shadow-pop);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 90;
}
.back-to-top[data-show="true"] { display: flex; }

/* ---------------------------------- 响应式 ---------------------------------- */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-art { order: -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .risk-grid { grid-template-columns: repeat(2, 1fr); }
  .app-features { grid-template-columns: repeat(2, 1fr); }
  .about-block { grid-template-columns: 1fr; }
}
@media (max-width: 860px) {
  .nav-list { display: none; }
  .nav-toggle { display: block; }
  .site-header.is-open .nav-list {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-gray-200);
    padding: 10px 20px 16px;
    gap: 2px;
  }
  .site-header.is-open .nav-list a { display: block; padding: 12px 6px; }
  .feature-article { grid-template-columns: 1fr; }
  .feature-article__aside { order: -1; }
  .summary-grid, .summary-grid.summary-grid--4 { grid-template-columns: 1fr; }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .app-download { grid-template-columns: 1fr; }
  .app-features { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .container { padding: 0 16px; }
  .section { padding: 42px 0; }
  .hero { padding: 44px 0 52px; }
  .risk-grid { grid-template-columns: 1fr; }
  .app-features { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr; }
}