/* ==========================================================================
   开元棋牌 —— 棋牌AI策略研究实验室
   style.css — 全站共用样式表（原创，无外部依赖）
   ========================================================================== */

:root{
  /* 色彩系统：暖白 / 深墨蓝 / 数据青 / AI紫 / 石墨灰 / 少量橙色点缀 */
  --c-bg:            #f7f4ee;
  --c-bg-soft:       #f0ece2;
  --c-surface:       #ffffff;
  --c-surface-alt:   #faf7f0;
  --c-ink:           #10131c;
  --c-ink-2:         #1b2036;
  --c-navy:          #12182b;
  --c-navy-2:        #1c2440;
  --c-navy-3:        #232c4d;
  --c-text:          #262b3a;
  --c-text-soft:     #565c72;
  --c-text-faint:    #7d84a0;
  --c-line:          #e2ddd0;
  --c-line-2:        #d6d0c0;
  --c-cyan:          #10a9b8;
  --c-cyan-2:        #0c8794;
  --c-cyan-soft:     #e3f5f6;
  --c-purple:        #6a5cd6;
  --c-purple-2:      #5548b8;
  --c-purple-soft:   #ece9fb;
  --c-orange:        #d97a3f;
  --c-orange-soft:   #f8e6d7;
  --c-graphite:      #4b5160;
  --c-on-navy:       #eef0fb;
  --c-on-navy-soft:  #aab1d6;

  --font-base: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",-apple-system,BlinkMacSystemFont,Helvetica,Arial,sans-serif;
  --font-mono: "SFMono-Regular","Consolas","Cascadia Code","Menlo",monospace;

  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 20px;
  --shadow-card: 0 1px 2px rgba(16,19,28,.04), 0 8px 24px -12px rgba(16,19,28,.14);
  --shadow-pop:  0 12px 40px -14px rgba(16,19,28,.28);
  --container: 1180px;
}

/* ---------- reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-text);
  font-family:var(--font-base);
  font-size:16px;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
svg{ max-width:100%; }
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-family:inherit; }
table{ border-collapse:collapse; width:100%; }

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

/* ---------- 排版 ---------- */
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-size:12.5px; letter-spacing:.06em; font-weight:600;
  color:var(--c-cyan-2); text-transform:uppercase;
}
.eyebrow::before{
  content:""; width:16px; height:1.5px; background:var(--c-cyan);
}
h1.page-title{
  font-size:clamp(28px,4.4vw,44px);
  line-height:1.28;
  font-weight:800;
  color:var(--c-on-navy);
  letter-spacing:-.01em;
  margin-top:14px;
}
.section-head{ margin-bottom:32px; max-width:760px; }
.section-head h2{
  font-size:clamp(22px,3vw,30px);
  font-weight:800;
  color:var(--c-ink);
  letter-spacing:-.01em;
  margin-top:10px;
}
.section-head p{ color:var(--c-text-soft); margin-top:10px; font-size:15.5px; }
.lede{ font-size:17.5px; color:var(--c-text-soft); max-width:720px; }

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:60;
  background:rgba(247,244,238,.92);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--c-line);
}
.header-row{
  display:flex; align-items:center; justify-content:space-between;
  height:68px; gap:16px;
}
.brand{ display:flex; align-items:center; gap:10px; font-weight:800; font-size:18px; color:var(--c-ink); flex:0 0 auto; }
.brand .logo-mark{ width:34px; height:34px; flex:0 0 auto; }
.brand .brand-sub{ display:block; font-size:11px; font-weight:600; color:var(--c-text-faint); letter-spacing:.03em; }
.main-nav{ display:flex; align-items:center; gap:2px; }
.main-nav a{
  display:inline-flex; align-items:center;
  padding:9px 13px; border-radius:999px;
  font-size:14.5px; font-weight:600; color:var(--c-text-soft);
  white-space:nowrap;
}
.main-nav a:hover{ color:var(--c-ink); background:var(--c-surface); }
.main-nav a.active{ color:var(--c-ink); background:var(--c-surface); box-shadow:var(--shadow-card); }
.nav-toggle{
  display:none; width:42px; height:42px; border-radius:10px;
  border:1px solid var(--c-line-2); background:var(--c-surface);
  align-items:center; justify-content:center; cursor:pointer; flex:0 0 auto;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after{
  content:""; display:block; width:18px; height:2px; background:var(--c-ink); position:relative; transition:.2s;
}
.nav-toggle span::before{ position:absolute; top:-6px; }
.nav-toggle span::after{ position:absolute; top:6px; }
.nav-toggle[aria-expanded="true"] span{ background:transparent; }
.nav-toggle[aria-expanded="true"] span::before{ top:0; transform:rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after{ top:0; transform:rotate(-45deg); }

/* ---------- Hero (深墨蓝研究实验室视觉) ---------- */
.hero{
  position:relative;
  background:
    radial-gradient(900px 460px at 82% -10%, rgba(106,92,214,.35), transparent 60%),
    radial-gradient(700px 420px at 8% 110%, rgba(16,169,184,.28), transparent 60%),
    linear-gradient(180deg, var(--c-navy) 0%, var(--c-navy-2) 100%);
  color:var(--c-on-navy);
  overflow:hidden;
}
.hero-inner{ padding:64px 0 56px; position:relative; z-index:2; }
.hero .lede{ color:var(--c-on-navy-soft); margin-top:16px; font-size:17px; }
.hero-figure{ position:relative; z-index:1; }
.hero-grid{ display:grid; grid-template-columns:1.05fr .95fr; gap:36px; align-items:center; }
.hero-tags{ display:flex; flex-wrap:wrap; gap:8px; margin-top:22px; }
.hero-tag{
  font-size:12.5px; font-weight:600; padding:6px 12px; border-radius:999px;
  background:rgba(238,240,251,.08); border:1px solid rgba(238,240,251,.18); color:var(--c-on-navy-soft);
}
.hero-actions{ display:flex; gap:12px; margin-top:28px; flex-wrap:wrap; }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:12px 20px; border-radius:999px; font-weight:700; font-size:14.5px;
  border:1px solid transparent; cursor:pointer;
}
.btn-primary{ background:linear-gradient(135deg,var(--c-cyan),var(--c-purple)); color:#fff; }
.btn-ghost{ background:rgba(238,240,251,.06); border-color:rgba(238,240,251,.28); color:var(--c-on-navy); }
.btn-line{ background:transparent; border-color:var(--c-line-2); color:var(--c-ink); }
.btn-line:hover{ border-color:var(--c-cyan); color:var(--c-cyan-2); }
.btn-sm{ padding:8px 14px; font-size:13px; }

/* ---------- Stat strip ---------- */
.stat-strip{ background:var(--c-surface); border-bottom:1px solid var(--c-line); }
.stat-row{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; padding:22px 0; }
.stat-item{ text-align:left; }
.stat-item .num{ font-family:var(--font-mono); font-weight:700; font-size:20px; color:var(--c-purple-2); }
.stat-item .lbl{ font-size:12.5px; color:var(--c-text-faint); margin-top:4px; }

/* ---------- Section ---------- */
.section{ padding:64px 0; }
.section.alt{ background:var(--c-surface); }
.section.dark{
  background:linear-gradient(180deg,var(--c-navy) 0%, var(--c-navy-3) 100%);
  color:var(--c-on-navy);
}
.section.dark .section-head h2{ color:var(--c-on-navy); }
.section.dark .section-head p{ color:var(--c-on-navy-soft); }
.section-tight{ padding:44px 0; }

/* ---------- 8 篇核心文章 ---------- */
.article-index{ counter-reset:artidx; display:flex; flex-direction:column; gap:18px; }
.article-block{
  counter-increment:artidx;
  background:var(--c-surface);
  border:1px solid var(--c-line);
  border-radius:var(--radius-l);
  padding:28px 28px 30px;
  box-shadow:var(--shadow-card);
  position:relative;
}
.article-block::before{
  content:counter(artidx,decimal-leading-zero);
  position:absolute; top:26px; right:28px;
  font-family:var(--font-mono); font-size:13px; color:var(--c-line-2); font-weight:700;
}
.article-meta{ display:flex; align-items:center; gap:10px; flex-wrap:wrap; }
.tag-cat{
  font-size:12px; font-weight:700; padding:4px 10px; border-radius:999px;
  background:var(--c-purple-soft); color:var(--c-purple-2);
}
.tag-date{ font-size:12.5px; color:var(--c-text-faint); font-family:var(--font-mono); }
.article-block h3{
  font-size:19.5px; line-height:1.5; font-weight:800; color:var(--c-ink);
  margin-top:12px; max-width:88%;
}
.article-block .art-summary{ margin-top:12px; color:var(--c-text-soft); font-size:15px; line-height:1.85; }
.article-block .art-keywords{ display:flex; gap:6px; flex-wrap:wrap; margin-top:14px; }
.kw{
  font-size:11.5px; color:var(--c-graphite); background:var(--c-bg-soft);
  border:1px solid var(--c-line); padding:3px 9px; border-radius:6px; font-family:var(--font-mono);
}
.art-diagram{ margin-top:18px; border-top:1px dashed var(--c-line); padding-top:18px; }
.art-diagram figcaption{ font-size:13px; color:var(--c-text-faint); margin-top:10px; }
.art-full{ margin-top:16px; }
.art-full-toggle{
  display:inline-flex; align-items:center; gap:6px; margin-top:16px;
  font-size:13.5px; font-weight:700; color:var(--c-cyan-2); cursor:pointer; background:none; border:none; padding:0;
}
.art-body{ display:none; margin-top:16px; padding-top:16px; border-top:1px solid var(--c-line); }
.art-body.open{ display:block; }
.art-body p{ color:var(--c-text); font-size:15.5px; margin-top:14px; }
.art-body p:first-child{ margin-top:0; }
.art-body h4{ font-size:15.5px; font-weight:800; color:var(--c-ink); margin-top:22px; }

/* ---------- 网格：卡片 ---------- */
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.grid-2{ display:grid; grid-template-columns:repeat(2,1fr); gap:20px; }
.grid-4{ display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }

.obs-card, .simple-card{
  background:var(--c-surface); border:1px solid var(--c-line); border-radius:var(--radius-m);
  padding:22px; box-shadow:var(--shadow-card);
}
.obs-card h4{ font-size:16.5px; font-weight:800; color:var(--c-ink); line-height:1.55; margin-top:10px; }
.obs-card p{ color:var(--c-text-soft); font-size:14.5px; margin-top:10px; }
.obs-badge{
  font-size:11.5px; font-weight:700; color:var(--c-cyan-2); background:var(--c-cyan-soft);
  padding:3px 9px; border-radius:6px;
}

/* ---------- 二级页面文章摘要 ---------- */
.subpage-card{
  background:var(--c-surface); border:1px solid var(--c-line); border-radius:var(--radius-m);
  padding:20px; display:flex; flex-direction:column; gap:10px; box-shadow:var(--shadow-card);
}
.subpage-card .src{ font-size:12px; color:var(--c-text-faint); font-weight:700; }
.subpage-card h4{ font-size:15.5px; font-weight:800; color:var(--c-ink); line-height:1.5; }
.subpage-card p{ font-size:14px; color:var(--c-text-soft); }
.subpage-card .more{ margin-top:auto; font-size:13px; font-weight:700; color:var(--c-cyan-2); }

/* ---------- 术语 / FAQ ---------- */
.term-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:14px; }
.term-item{
  background:var(--c-surface); border:1px solid var(--c-line); border-radius:var(--radius-m);
  padding:18px 20px;
}
.term-item .q{ font-weight:800; font-size:15px; color:var(--c-ink); }
.term-item .a{ font-size:14px; color:var(--c-text-soft); margin-top:8px; }

.faq-list{ display:flex; flex-direction:column; gap:10px; }
.faq-item{
  background:var(--c-surface); border:1px solid var(--c-line); border-radius:var(--radius-m);
  overflow:hidden;
}
.faq-q{
  width:100%; display:flex; align-items:center; justify-content:space-between; gap:14px;
  padding:16px 20px; background:none; border:none; text-align:right; cursor:pointer;
}
.faq-q .qt{ font-size:15px; font-weight:700; color:var(--c-ink); text-align:right; flex:1; }
.faq-q .plus{
  flex:0 0 auto; width:22px; height:22px; border-radius:50%; border:1.5px solid var(--c-line-2);
  display:flex; align-items:center; justify-content:center; color:var(--c-text-faint); font-size:15px; line-height:1;
  transition:transform .18s ease;
}
.faq-item[data-open="true"] .plus{ transform:rotate(45deg); border-color:var(--c-cyan); color:var(--c-cyan-2); }
.faq-a{ max-height:0; overflow:hidden; transition:max-height .22s ease; }
.faq-a p{ padding:0 20px 18px; font-size:14.5px; color:var(--c-text-soft); }
.faq-search{ margin-bottom:18px; }
.faq-search input{
  width:100%; padding:13px 16px; border-radius:999px; border:1px solid var(--c-line-2);
  background:var(--c-surface); font-size:14.5px; color:var(--c-ink);
}
.faq-search input:focus{ outline:2px solid var(--c-cyan); outline-offset:1px; }

/* ---------- Pipeline / 流程图（原生SVG容器） ---------- */
.diagram-card{
  background:var(--c-surface); border:1px solid var(--c-line); border-radius:var(--radius-l);
  padding:24px; box-shadow:var(--shadow-card);
}
.diagram-card figcaption{ font-size:13.5px; color:var(--c-text-faint); margin-top:14px; line-height:1.7; }
.diagram-card.on-dark{ background:rgba(238,240,251,.05); border-color:rgba(238,240,251,.16); }
.diagram-card.on-dark figcaption{ color:var(--c-on-navy-soft); }

/* ---------- 品牌介绍 / 声明 ---------- */
.about-box{
  background:var(--c-surface); border:1px solid var(--c-line); border-radius:var(--radius-l);
  padding:30px; box-shadow:var(--shadow-card);
}
.about-box p{ color:var(--c-text-soft); font-size:15px; margin-top:14px; }
.about-box p:first-of-type{ margin-top:0; }
.about-fields{ display:grid; grid-template-columns:repeat(3,1fr); gap:14px; margin-top:20px; }
.about-field{
  border:1px dashed var(--c-line-2); border-radius:var(--radius-s); padding:14px 16px; background:var(--c-bg-soft);
}
.about-field .k{ font-size:12px; color:var(--c-text-faint); font-weight:700; }
.about-field .v{ font-size:13.5px; color:var(--c-text-faint); margin-top:4px; font-style:italic; }
.statement-box{
  border-left:3px solid var(--c-purple); background:var(--c-purple-soft);
  padding:16px 18px; border-radius:0 var(--radius-s) var(--radius-s) 0; margin-top:14px;
}
.statement-box p{ color:var(--c-text-soft); font-size:13.5px; margin:0; }

/* ---------- Breadcrumb ---------- */
.breadcrumb{ padding:16px 0 0; font-size:13px; color:var(--c-on-navy-soft); }
.breadcrumb a{ color:var(--c-on-navy-soft); }
.breadcrumb a:hover{ color:#fff; }
.breadcrumb span{ margin:0 6px; opacity:.5; }

/* ---------- 内部链接条 ---------- */
.link-rail{ display:flex; flex-wrap:wrap; gap:10px; margin-top:16px; }
.link-chip{
  font-size:13.5px; font-weight:700; color:var(--c-ink); background:var(--c-surface);
  border:1px solid var(--c-line-2); padding:9px 14px; border-radius:999px;
  display:inline-flex; align-items:center; gap:6px;
}
.link-chip:hover{ border-color:var(--c-cyan); color:var(--c-cyan-2); }
.link-chip .arrow{ font-family:var(--font-mono); }

/* ---------- Demo Data 标记 ---------- */
.demo-flag{
  display:inline-flex; align-items:center; gap:6px; font-size:11.5px; font-weight:700;
  color:var(--c-orange); background:var(--c-orange-soft); padding:3px 10px; border-radius:6px;
}

/* ---------- App 功能网格 ---------- */
.feature-card{
  background:var(--c-surface); border:1px solid var(--c-line); border-radius:var(--radius-m);
  padding:22px; display:flex; flex-direction:column; gap:10px; box-shadow:var(--shadow-card);
}
.feature-card .fnum{ font-family:var(--font-mono); font-size:12px; color:var(--c-cyan-2); font-weight:700; }
.feature-card h4{ font-size:16px; font-weight:800; color:var(--c-ink); }
.feature-card p{ font-size:14px; color:var(--c-text-soft); }
.feature-card .ic{ width:38px; height:38px; }

/* ---------- Download 卡片 ---------- */
.download-panel{
  background:linear-gradient(180deg,var(--c-navy),var(--c-navy-3));
  border-radius:var(--radius-l); padding:32px; color:var(--c-on-navy);
}
.download-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:14px; margin-top:22px; }
.download-item{
  background:rgba(238,240,251,.06); border:1px solid rgba(238,240,251,.18); border-radius:var(--radius-m);
  padding:18px; display:flex; align-items:center; gap:12px;
}
.download-item .ic{ width:34px; height:34px; flex:0 0 auto; }
.download-item .name{ font-weight:800; font-size:14.5px; }
.download-item .status{ font-size:12.5px; color:var(--c-on-navy-soft); margin-top:3px; }

/* ---------- Radar / Matrix ---------- */
.radar-wrap{ display:grid; grid-template-columns:1fr 1fr; gap:28px; align-items:center; }
.radar-legend{ display:flex; flex-direction:column; gap:10px; }
.radar-legend li{ display:flex; align-items:center; gap:10px; font-size:13.5px; color:var(--c-text-soft); }
.radar-legend b{ color:var(--c-ink); font-weight:700; }
.dot{ width:9px; height:9px; border-radius:50%; flex:0 0 auto; }

.matrix-table{ font-size:13.5px; }
.matrix-table th,.matrix-table td{ padding:11px 12px; border-bottom:1px solid var(--c-line); text-align:left; }
.matrix-table th{ color:var(--c-text-faint); font-weight:700; font-size:12px; text-transform:uppercase; letter-spacing:.03em; }
.matrix-table td{ color:var(--c-text); }
.matrix-scroll{ overflow-x:auto; }

/* ---------- 交互实验区（Demo 组件通用） ---------- */
.lab-panel{
  background:var(--c-surface); border:1px solid var(--c-line); border-radius:var(--radius-l);
  padding:26px; box-shadow:var(--shadow-card);
}
.lab-panel .lab-head{ display:flex; align-items:center; justify-content:space-between; gap:12px; flex-wrap:wrap; }
.lab-tabs{ display:flex; gap:8px; flex-wrap:wrap; }
.lab-tab{
  font-size:13px; font-weight:700; padding:8px 14px; border-radius:999px;
  border:1px solid var(--c-line-2); background:var(--c-surface); color:var(--c-text-soft); cursor:pointer;
}
.lab-tab[aria-selected="true"]{ background:var(--c-navy); color:#fff; border-color:var(--c-navy); }
.lab-stage{ margin-top:20px; min-height:120px; }
.lab-readout{
  margin-top:16px; display:grid; grid-template-columns:repeat(3,1fr); gap:12px;
}
.lab-readout .cell{ background:var(--c-bg-soft); border-radius:var(--radius-s); padding:12px 14px; }
.lab-readout .cell .k{ font-size:11.5px; color:var(--c-text-faint); }
.lab-readout .cell .v{ font-family:var(--font-mono); font-size:16px; font-weight:700; color:var(--c-ink); margin-top:2px; }
.lab-note{ font-size:13px; color:var(--c-text-faint); margin-top:14px; }

/* Decision Tree demo */
.tree-demo{ display:flex; flex-direction:column; gap:10px; align-items:center; }
.tree-row{ display:flex; gap:10px; flex-wrap:wrap; justify-content:center; }
.tree-node{
  border:1.5px solid var(--c-line-2); background:var(--c-surface); border-radius:10px;
  padding:8px 12px; font-size:12.5px; font-family:var(--font-mono); cursor:pointer; color:var(--c-text-soft);
}
.tree-node.expanded{ border-color:var(--c-cyan); color:var(--c-cyan-2); background:var(--c-cyan-soft); }
.tree-node.pruned{ opacity:.4; border-style:dashed; }

/* Self-play demo */
.vs-demo{ display:flex; align-items:center; justify-content:center; gap:18px; text-align:center; }
.vs-side{ flex:1; }
.vs-side .name{ font-weight:800; font-size:15px; color:var(--c-ink); }
.vs-side .role{ font-size:12px; color:var(--c-text-faint); margin-top:4px; }
.vs-mid{ font-family:var(--font-mono); color:var(--c-purple-2); font-weight:800; font-size:13px; }

/* Multi-agent demo */
.agent-ring{ display:flex; justify-content:center; gap:14px; flex-wrap:wrap; }
.agent-dot{
  width:52px; height:52px; border-radius:50%; display:flex; align-items:center; justify-content:center;
  font-family:var(--font-mono); font-weight:700; font-size:13px; color:#fff;
  background:linear-gradient(135deg,var(--c-cyan),var(--c-purple));
}

/* AI assistant demo */
.assistant-demo{ display:flex; flex-direction:column; gap:14px; }
.assistant-q-list{ display:flex; flex-wrap:wrap; gap:8px; }
.assistant-answer{
  background:var(--c-bg-soft); border-radius:var(--radius-m); padding:16px 18px; font-size:14.5px; color:var(--c-text);
  border:1px solid var(--c-line); min-height:64px;
}

/* ---------- Footer ---------- */
.site-footer{ background:var(--c-navy); color:var(--c-on-navy-soft); padding:52px 0 26px; margin-top:0; }
.footer-grid{ display:grid; grid-template-columns:1.4fr repeat(4,1fr); gap:28px; }
.footer-brand{ display:flex; align-items:center; gap:10px; color:#fff; font-weight:800; font-size:17px; }
.footer-brand .logo-mark{ width:30px; height:30px; }
.footer-desc{ font-size:13.5px; margin-top:14px; line-height:1.8; color:var(--c-on-navy-soft); max-width:320px; }
.footer-col h5{ font-size:12.5px; letter-spacing:.05em; text-transform:uppercase; color:var(--c-on-navy-soft); font-weight:700; }
.footer-col ul{ margin-top:14px; display:flex; flex-direction:column; gap:10px; }
.footer-col a{ font-size:13.5px; color:var(--c-on-navy-soft); }
.footer-col a:hover{ color:#fff; }
.footer-bottom{
  margin-top:40px; padding-top:22px; border-top:1px solid rgba(238,240,251,.12);
  display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; font-size:12.5px; color:var(--c-on-navy-soft);
}
.footer-blank-note{ font-size:12px; color:rgba(170,177,214,.7); font-style:italic; }

/* ---------- 返回顶部 ---------- */
.back-top{
  position:fixed; right:22px; bottom:22px; width:44px; height:44px; border-radius:50%;
  background:var(--c-navy); color:#fff; border:none; cursor:pointer; display:flex; align-items:center; justify-content:center;
  box-shadow:var(--shadow-pop); opacity:0; pointer-events:none; transition:opacity .2s ease, transform .2s ease; z-index:80;
}
.back-top.show{ opacity:1; pointer-events:auto; }
.back-top:hover{ transform:translateY(-2px); }

/* ---------- Prose 文章正文页（若需要独立细节可复用） ---------- */
.prose p{ margin-top:14px; color:var(--c-text); font-size:15.5px; }
.prose h4{ margin-top:24px; font-size:16px; font-weight:800; color:var(--c-ink); }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1024px){
  .container{ padding:0 18px; }
  .hero-grid{ grid-template-columns:1fr; }
  .grid-3{ grid-template-columns:repeat(2,1fr); }
  .footer-grid{ grid-template-columns:1fr 1fr; }
  .about-fields{ grid-template-columns:1fr; }
  .stat-row{ grid-template-columns:repeat(2,1fr); }
}

@media (max-width:900px){
  .main-nav{
    position:fixed; inset:68px 0 auto 0; background:var(--c-bg); border-bottom:1px solid var(--c-line);
    flex-direction:column; align-items:stretch; padding:10px 16px 18px; gap:4px;
    transform:translateY(-8px); opacity:0; pointer-events:none; transition:.18s ease;
    max-height:calc(100vh - 68px); overflow-y:auto;
  }
  .main-nav.open{ transform:translateY(0); opacity:1; pointer-events:auto; }
  .main-nav a{ padding:13px 14px; border-radius:10px; }
  .nav-toggle{ display:flex; }
  .radar-wrap{ grid-template-columns:1fr; }
  .term-grid{ grid-template-columns:1fr; }
  .grid-4{ grid-template-columns:repeat(2,1fr); }
}

@media (max-width:768px){
  .grid-3{ grid-template-columns:1fr; }
  .grid-2{ grid-template-columns:1fr; }
  .download-grid{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns:1fr 1fr; }
  .lab-readout{ grid-template-columns:1fr; }
  h1.page-title{ margin-top:12px; }
}

@media (max-width:480px){
  .footer-grid{ grid-template-columns:1fr; }
  .grid-4{ grid-template-columns:1fr 1fr; }
  .stat-row{ grid-template-columns:1fr 1fr; }
  .article-block{ padding:22px 18px 24px; }
  .article-block h3{ max-width:100%; }
  .hero-inner{ padding:44px 0 40px; }
  .about-fields{ grid-template-columns:1fr; }
}

/* 保证任何宽内容（表格 / 长图）不撑破视口而横向滚动页面本身 */
.matrix-scroll{ -webkit-overflow-scrolling:touch; }