/* heat 站视觉系统 —— 明亮工程风：冷钢蓝主文 + 淬火橙强调
   命名空间 heat-* 与其它站点完全隔离；断点 1024px（与 skeleton_contract.responsive_folding 一致） */
:root {
  --ink: #16202b;
  --ink-2: #4a5a6a;
  --ink-3: #7b8896;
  --line: #e3e8ee;
  --line-2: #eef2f6;
  --bg: #f6f8fa;
  --white: #ffffff;
  --brand: #e8590c;
  --brand-2: #f76707;
  --brand-soft: #fff3ea;
  --steel: #1f3a5f;
  --steel-2: #2b4d78;
  --ok: #1f9254;
  --h2-inset: 16px;
  --topbar: 68px;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(22, 32, 43, .07);
  --shadow-lg: 0 18px 48px rgba(22, 32, 43, .16);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--steel-2); text-decoration: none; }
a:hover { color: var(--brand); }
img { max-width: 100%; }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.45; margin: 0 0 .6em; }
p { margin: 0 0 1em; }

.wrap { width: min(1200px, 100%); margin: 0 auto; padding: 0 24px; }

/* ── 顶部固定导航 ───────────────────────────────────────────────────────── */
.heat-topbar {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.heat-topbar .wrap { display: flex; align-items: center; gap: 24px; height: var(--topbar); }
.heat-logo { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .3px; color: var(--ink); }
.heat-logo .mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), #ff922b);
  display: grid; place-items: center; color: #fff; font-size: 15px; font-weight: 900;
}
.heat-logo small { display: block; font-size: 11px; color: var(--ink-3); font-weight: 500; letter-spacing: 0; }
.heat-nav { display: flex; gap: 22px; margin-left: auto; }
.heat-nav a { font-size: 15px; color: var(--ink-2); font-weight: 600; padding: 6px 0; position: relative; }
.heat-nav a:hover, .heat-nav a.on { color: var(--brand); }
.heat-nav a.on::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px; background: var(--brand);
}
.heat-burger {
  display: none; margin-left: auto; width: 42px; height: 36px; border: 1px solid var(--line);
  border-radius: 10px; background: #fff; cursor: pointer;
}
.heat-burger span { display: block; width: 18px; height: 2px; background: var(--ink); margin: 4px auto; }
.heat-nav[data-open="1"] { display: flex; }

/* ── 面包屑（左缘与正文 H2 严格对齐） ───────────────────────────────────── */
.heat-layout { --h2-inset: 16px; }
.heat-layout.is-page { --h2-inset: 48px; }
.heat-breadcrumb {
  padding-left: var(--h2-inset);
  font-size: 13px; color: var(--ink-3);
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
  margin: 18px 0 10px;
}
.heat-breadcrumb a { color: var(--ink-3); }
.heat-breadcrumb a:hover { color: var(--brand); }
.heat-breadcrumb .sep { color: var(--line); }

/* ── 首屏 ───────────────────────────────────────────────────────────────── */
.heat-hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(900px 320px at 82% -10%, rgba(232, 89, 12, .16), transparent 70%),
    linear-gradient(180deg, #ffffff 0%, #f9fbfc 100%);
  border-bottom: 1px solid var(--line);
  padding: 62px 0 52px;
}
.heat-hero::after {
  content: ""; position: absolute; right: -80px; top: -60px; width: 420px; height: 420px;
  background: repeating-linear-gradient(45deg, rgba(31, 58, 95, .05) 0 2px, transparent 2px 14px);
  border-radius: 50%;
}
.heat-hero h1 { font-size: clamp(28px, 4.2vw, 44px); max-width: 22em; letter-spacing: -.4px; }
.heat-hero h1 em { font-style: normal; color: var(--brand); }
.heat-hero .lead { color: var(--ink-2); max-width: 46em; font-size: 17px; }
.heat-hero .chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.chip {
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 14px; font-size: 13px; color: var(--ink-2); box-shadow: var(--shadow);
}
.chip.hot { border-color: rgba(232, 89, 12, .4); color: var(--brand); background: var(--brand-soft); }
.heat-hero .cta { margin-top: 26px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 12px 24px; border-radius: 999px; font-weight: 700; font-size: 15px;
  background: var(--brand); color: #fff; box-shadow: 0 8px 20px rgba(232, 89, 12, .24);
}
.btn:hover { background: var(--brand-2); color: #fff; }
.btn.ghost { background: #fff; color: var(--steel); border: 1px solid var(--line); box-shadow: none; }
.btn.ghost:hover { border-color: var(--brand); color: var(--brand); }

/* ── 区块 ───────────────────────────────────────────────────────────────── */
.heat-section { padding: 54px 0; }
.heat-section.alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.heat-section h2 {
  font-size: clamp(22px, 2.6vw, 30px); margin-bottom: 6px;
  padding-left: var(--h2-inset, 0);
}
.heat-section .sub { color: var(--ink-3); font-size: 14px; margin-bottom: 26px; padding-left: var(--h2-inset, 0); }

.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; }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); transition: transform .18s ease, box-shadow .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--ink-2); font-size: 14.5px; margin: 0; }
.card .kicker { font-size: 12px; color: var(--brand); font-weight: 700; letter-spacing: .5px; }

/* 数据条 */
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat {
  background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px;
}
.stat b { display: block; font-size: 22px; color: var(--steel); }
.stat span { font-size: 12.5px; color: var(--ink-3); }

/* ── 列表页 / 详情页布局 ────────────────────────────────────────────────── */
.heat-layout { padding: 8px 0 40px; }
.list-layout { display: grid; grid-template-columns: 240px 1fr; gap: 32px; align-items: start; }
.article-layout { display: grid; grid-template-columns: 1fr 260px; gap: 32px; align-items: start; }
.page-layout { display: grid; grid-template-columns: 1fr 240px; gap: 32px; align-items: start; }

.heat-main, .heat-body {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 28px 34px; box-shadow: var(--shadow);
}
.heat-body h1 { font-size: clamp(22px, 3vw, 32px); margin-bottom: 12px; }
.heat-body h2 {
  font-size: 20px; margin-top: 34px; padding-left: var(--h2-inset, 0);
  border-left: 3px solid var(--brand); margin-left: 0;
}
.heat-body h3 { font-size: 17px; margin-top: 22px; padding-left: var(--h2-inset, 0); }
.heat-body p, .heat-body li { padding-left: 0; }
.heat-body ul, .heat-body ol { padding-left: 24px; }
.heat-body li { margin-bottom: 6px; }
.heat-updated { font-size: 13px; color: var(--ink-3); padding-left: var(--h2-inset, 0); margin: 0 0 18px; }
.heat-updated time { color: var(--ink-2); }
.heat-abstract {
  background: var(--brand-soft); border-left: 3px solid var(--brand); border-radius: 0 10px 10px 0;
  padding: 14px 18px; margin: 0 0 8px; color: var(--ink-2); font-size: 15px;
}
.heat-abstract strong { color: var(--brand); }
.heat-keywords { font-size: 14px; color: var(--ink-3); margin-bottom: 6px; }
.tag-text {
  display: inline-block; background: var(--line-2); color: var(--ink-2);
  border-radius: 6px; padding: 2px 10px; font-size: 13px; margin: 0 6px 6px 0;
}
.heat-conclusion {
  background: #fff; border: 1px dashed rgba(232, 89, 12, .5); border-radius: 12px;
  padding: 16px 20px; margin: 22px 0;
}
.heat-conclusion strong { color: var(--brand); }
.heat-callout {
  background: #f2f7ff; border: 1px solid #d7e4f5; border-radius: 12px; padding: 14px 18px; margin: 18px 0;
  font-size: 15px; color: var(--ink-2);
}

/* 表格 */
table.heat-spec { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14.5px; }
table.heat-spec th, table.heat-spec td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
table.heat-spec th { background: #f4f7fa; color: var(--steel); font-weight: 700; }
table.heat-spec tr:nth-child(even) td { background: #fbfcfd; }

/* FAQ */
.heat-faq { margin-top: 30px; }
.heat-faq h2 { border-left-color: var(--steel); }
.heat-faq details {
  border: 1px solid var(--line); border-radius: 10px; margin-bottom: 10px; background: #fff; overflow: hidden;
}
.heat-faq summary {
  cursor: pointer; padding: 14px 18px; font-weight: 600; font-size: 15px; list-style: none;
  display: flex; align-items: center; gap: 10px;
}
.heat-faq summary::-webkit-details-marker { display: none; }
.heat-faq summary::after {
  content: "＋"; margin-left: auto; color: var(--brand); font-weight: 700;
}
.heat-faq details[open] summary::after { content: "－"; }
.heat-faq details .faq-a { padding: 0 18px 16px; color: var(--ink-2); font-size: 15px; }

/* 目录（sticky，禁止 fixed） */
.toc-aside { position: sticky; top: calc(var(--topbar) + 16px); max-height: calc(100vh - 120px); overflow-y: auto; }
.toc-panel, .cat-panel {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 6px 16px 14px; box-shadow: var(--shadow);
}
.toc-panel summary, .cat-panel summary {
  cursor: pointer; padding: 12px 0; font-weight: 700; font-size: 15px; list-style: none;
  display: flex; align-items: center; gap: 8px;
}
.toc-panel summary::-webkit-details-marker, .cat-panel summary::-webkit-details-marker { display: none; }
.toc-panel summary::after, .cat-panel summary::after {
  content: ""; margin-left: auto; width: 8px; height: 8px; border-right: 2px solid var(--ink-3);
  border-bottom: 2px solid var(--ink-3); transform: rotate(45deg); transition: transform .2s ease;
}
.toc-panel[open] summary::after, .cat-panel[open] summary::after { transform: rotate(-135deg); }
#toc { list-style: none; margin: 0; padding: 0; }
#toc li { margin: 4px 0; }
#toc a { display: block; font-size: 14px; color: var(--ink-2); padding: 5px 8px; border-radius: 8px; }
#toc a:hover { background: var(--brand-soft); color: var(--brand); }
#toc li.lv3 a { padding-left: 20px; font-size: 13.5px; color: var(--ink-3); }

/* 分类列表（左侧垂直，禁卡片网格） */
.category-list { list-style: none; margin: 0; padding: 0; }
.category-list li { margin: 2px 0; }
.category-list a {
  display: block; padding: 9px 12px; border-radius: 9px; font-size: 14.5px; color: var(--ink-2);
  border-left: 3px solid transparent;
}
.category-list a:hover { background: var(--brand-soft); color: var(--brand); border-left-color: var(--brand); }
.category-list a.on { background: #eef3f9; color: var(--steel); font-weight: 700; border-left-color: var(--steel); }

/* 条目列表 */
.entry-list { list-style: none; margin: 0; padding: 0; }
.entry-list li { border-bottom: 1px solid var(--line-2); padding: 18px 0; }
.entry-list li:last-child { border-bottom: 0; }
.entry-list h3 { font-size: 17px; margin: 0 0 6px; }
.entry-list p { color: var(--ink-2); font-size: 14.5px; margin: 0 0 8px; }
.entry-meta { font-size: 12.5px; color: var(--ink-3); }
.entry-meta .cat { color: var(--brand); font-weight: 600; }

/* 分页 */
.pager { display: flex; gap: 8px; margin-top: 24px; }
.pager a {
  padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; background: #fff; font-size: 14px;
}
.pager a.on { background: var(--steel); color: #fff; border-color: var(--steel); }

/* ── 悬浮工具胶囊 ───────────────────────────────────────────────────────── */
.heat-dock {
  position: fixed; right: 18px; top: 50%; transform: translateY(-50%); z-index: 80;
  display: flex; flex-direction: column; gap: 12px;
}
.dock-btn {
  display: flex; align-items: center; gap: 8px; width: 96px; height: 40px; padding: 0 14px;
  border: 0; border-radius: 999px; cursor: pointer; color: #fff; font-size: 14px; font-weight: 700;
  font-family: inherit; box-shadow: 0 8px 20px rgba(22, 32, 43, .18);
  background: linear-gradient(120deg, var(--brand), #ff922b);
  transition: transform .16s ease, box-shadow .16s ease;
}
.dock-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(22, 32, 43, .24); }
.dock-btn.steel { background: linear-gradient(120deg, var(--steel), var(--steel-2)); }
.dock-btn.outline { background: #fff; color: var(--brand); border: 1.5px solid var(--brand); box-shadow: var(--shadow); }
.dock-btn svg { width: 16px; height: 16px; flex: none; }

/* 名片弹窗 300x500 竖版，原尺寸高清 */
.heat-modal {
  position: fixed; inset: 0; z-index: 120; display: none;
  background: rgba(16, 24, 33, .58); backdrop-filter: blur(2px);
}
.heat-modal[data-open="1"] { display: grid; place-items: center; }
.heat-modal .box {
  position: relative; width: 300px; height: 500px; background: #fff; border-radius: 16px; overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.heat-modal .box img { width: 300px; height: 500px; object-fit: contain; display: block; background: #0f1720; }
.heat-modal .close {
  position: absolute; right: 8px; top: 8px; width: 30px; height: 30px; border: 0; border-radius: 50%;
  background: rgba(0, 0, 0, .5); color: #fff; font-size: 18px; cursor: pointer; line-height: 1;
}
.heat-modal .tip { position: absolute; left: 0; right: 0; bottom: 0; background: rgba(15, 23, 32, .82); color: #fff; font-size: 12px; padding: 8px 12px; }

/* ── 页脚 ───────────────────────────────────────────────────────────────── */
.heat-footer { background: var(--steel); color: #c9d6e4; padding: 42px 0 28px; margin-top: 40px; }
.heat-footer .wrap { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 28px; }
.heat-footer h4 { color: #fff; font-size: 15px; margin-bottom: 12px; }
.heat-footer a { color: #c9d6e4; font-size: 14px; }
.heat-footer a:hover { color: #ffb27a; }
.heat-footer ul { list-style: none; margin: 0; padding: 0; }
.heat-footer li { margin-bottom: 7px; }
.heat-footer .copy { grid-column: 1 / -1; border-top: 1px solid rgba(255, 255, 255, .12); padding-top: 16px; font-size: 13px; color: #8fa3b8; }
.heat-footer .mail-link { font-weight: 600; }

/* 404 */
.heat-404 { min-height: 60vh; display: grid; place-items: center; text-align: center; padding: 80px 24px; }

/* ── 响应式 ─────────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .heat-nav { display: none; position: absolute; left: 0; right: 0; top: var(--topbar);
    background: #fff; border-bottom: 1px solid var(--line); flex-direction: column; gap: 0; padding: 10px 24px 16px; }
  .heat-nav a { padding: 12px 0; border-bottom: 1px solid var(--line-2); }
  .heat-nav a.on::after { display: none; }
  .heat-burger { display: block; }
  .list-layout { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .page-layout { grid-template-columns: 1fr; }
  .toc-aside { position: static; max-height: none; order: -1; }
  .grid-3, .grid-4, .stat-row { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .heat-footer .wrap { grid-template-columns: 1fr 1fr; }
  .heat-dock { right: 10px; gap: 10px; }
  .dock-btn { width: 84px; height: 36px; font-size: 13px; padding: 0 12px; }
  .heat-layout, .heat-layout.is-page { --h2-inset: 12px; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .heat-hero { padding: 40px 0 36px; }
  .grid-3, .grid-4, .stat-row { grid-template-columns: 1fr; }
  .heat-main, .heat-body { padding: 20px 18px 26px; }
  .heat-footer .wrap { grid-template-columns: 1fr; }
  .dock-btn { width: 74px; height: 34px; font-size: 12px; }
}

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