/* style.css —— 车载雷达测试与车规验证 原创设计体系（tvt- 前缀，区别于集群其他站） */
:root{
  --ink:#10242E;
  --ink-2:#1B3A40;
  --accent:#1BB3A0;        /* 验证绿 */
  --accent-2:#F2784B;      /* 标定橙 */
  --bg:#F4F7F6;
  --paper:#FFFFFF;
  --text:#1B2A30;
  --muted:#5C6B6E;
  --line:#D5E0DE;
  --h2-inset:16px;          /* 面包屑与 H2 左缘对齐基准（M18c++）*/
  --page-inset:48px;
  --header-h:62px;
}
*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;line-height:1.78;
}
a{color:var(--ink-2);text-decoration:none;}
a:hover{color:var(--accent);}
img{max-width:100%;}
h1,h2,h3,h4{line-height:1.36;color:var(--ink);}
h1{font-size:28px;margin:0 0 12px;}
h2{font-size:22px;margin:30px 0 12px;padding-bottom:6px;border-bottom:2px solid var(--accent);}
h3{font-size:18px;margin:22px 0 10px;color:var(--ink-2);}

/* ---------- 顶栏 ---------- */
.tvt-header{position:sticky;top:0;z-index:40;background:var(--ink);color:#fff;box-shadow:0 2px 10px rgba(16,36,46,.18);}
.tvt-header-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:var(--header-h);display:flex;align-items:center;gap:16px;}
.tvt-logo{color:#fff;font-weight:700;font-size:18px;white-space:nowrap;letter-spacing:.5px;}
.tvt-nav{display:flex;align-items:center;gap:4px;flex:1;}
.tvt-nav>a,.tvt-nav-group>summary{
  color:#DCEAE7;padding:8px 12px;border-radius:8px;cursor:pointer;font-size:15px;list-style:none;
}
.tvt-nav>a:hover,.tvt-nav-group>summary:hover{background:rgba(27,179,160,.18);color:#fff;}
.tvt-nav-group{position:relative;}
.tvt-nav-group>summary::-webkit-details-marker{display:none;}
.tvt-nav-sub{position:absolute;top:100%;left:0;background:#fff;color:var(--text);min-width:170px;border-radius:10px;
  box-shadow:0 10px 28px rgba(16,36,46,.20);padding:6px;display:none;}
.tvt-nav-group[open]>.tvt-nav-sub{display:block;}
.tvt-nav-sub a{display:block;padding:8px 12px;border-radius:6px;color:var(--text);}
.tvt-nav-sub a:hover{background:var(--bg);color:var(--accent);}
.tvt-nav-toggle{display:none;background:none;border:0;color:#fff;font-size:26px;cursor:pointer;margin-left:auto;}

/* ---------- 容器与面包屑 ---------- */
.tvt-container{max-width:1200px;margin:0 auto;padding:0 24px;}
.tvt-breadcrumb{font-size:13px;color:var(--muted);padding:14px 0 0;margin-bottom:6px;}
.tvt-breadcrumb a{color:var(--muted);}
.tvt-breadcrumb a:hover{color:var(--accent);}
.tvt-crumb-sep{margin:0 8px;color:#B7C5C2;}
.tvt-crumb-current{color:var(--ink);font-weight:600;}

/* ---------- 详情页栅格 ---------- */
.tvt-layout-grid{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:34px;align-items:start;padding:8px 0 40px;}
.tvt-content-main{min-width:0;}
.tvt-content-main p{margin:12px 0;}
.tvt-content-main ul,.tvt-content-main ol{padding-left:22px;}
.tvt-content-main li{margin:6px 0;}
.tvt-update{font-size:13px;color:var(--muted);}
.tvt-meta-line{font-size:14px;color:var(--muted);background:rgba(27,179,160,.08);padding:6px 12px;border-radius:8px;display:inline-block;}
.tvt-keywords{font-size:13px;color:var(--ink-2);background:rgba(242,120,75,.10);padding:6px 12px;border-radius:8px;display:inline-block;}

/* TOC 悬浮（sticky，非 fixed，防 M1''）*/
.tvt-toc-aside{position:sticky;top:calc(var(--header-h) + 16px);max-height:calc(100vh - var(--header-h) - 32px);overflow:auto;}
.tvt-toc-panel{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:12px 14px;}
.tvt-toc-panel>summary{cursor:pointer;font-weight:600;color:var(--ink);list-style:none;position:relative;padding-right:18px;}
.tvt-toc-panel>summary::-webkit-details-marker{display:none;}
.tvt-toc-panel>summary::after{content:"";position:absolute;right:2px;top:8px;border:5px solid transparent;border-top-color:var(--accent);transition:transform .2s;}
.tvt-toc-panel[open]>summary::after{transform:rotate(180deg);border-top-color:transparent;border-bottom-color:var(--accent);top:3px;}
.tvt-toc-panel nav a{display:block;padding:5px 0;color:var(--muted);font-size:14px;border-left:2px solid var(--line);padding-left:10px;}
.tvt-toc-panel nav a:hover{color:var(--accent);border-left-color:var(--accent);}
.tvt-toc-l3{padding-left:22px !important;font-size:13px;}

/* ---------- 列表页栅格（侧栏在前 → 240px 居左，内容 1fr，防 M27）---------- */
.tvt-list-layout{padding:8px 0 40px;}
.tvt-list-layout .tvt-layout-grid{display:grid;grid-template-columns:240px minmax(0,1fr);gap:30px;align-items:start;}
.tvt-cat-side{position:sticky;top:calc(var(--header-h) + 16px);}
.tvt-cat-panel{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:10px 12px;}
.tvt-cat-panel>summary{cursor:pointer;font-weight:600;color:var(--ink);list-style:none;position:relative;padding-right:18px;}
.tvt-cat-panel>summary::-webkit-details-marker{display:none;}
.tvt-cat-panel>summary::after{content:"";position:absolute;right:2px;top:7px;border:5px solid transparent;border-top-color:var(--accent);transition:transform .2s;}
.tvt-cat-panel[open]>summary::after{transform:rotate(180deg);border-top-color:transparent;border-bottom-color:var(--accent);top:2px;}
.tvt-category-list{list-style:none;margin:8px 0 0;padding:0;}
.tvt-category-list li{margin:2px 0;}
.tvt-category-list a{display:block;padding:8px 12px;border-radius:8px;color:var(--text);font-size:15px;}
.tvt-category-list a:hover{background:var(--bg);}
.tvt-category-list a.active{background:var(--ink);color:#fff;}
.tvt-cat-content h1{font-size:26px;}
.tvt-list-desc{color:var(--muted);margin:6px 0 18px;}
.tvt-item-list{list-style:none;margin:0;padding:0;}
.tvt-item{background:var(--paper);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:12px;padding:16px 18px;margin-bottom:14px;}
.tvt-item-title{font-size:18px;margin:0 0 6px;}
.tvt-item-title a{color:var(--ink);}
.tvt-item p{margin:0;color:var(--muted);font-size:14px;}
.tvt-item-date{display:inline-block;margin-top:6px;font-size:12px;color:#9AA9A6;}
.tvt-pagination{display:flex;gap:8px;margin-top:18px;}
.tvt-pagination a{padding:6px 12px;border:1px solid var(--line);border-radius:8px;color:var(--ink-2);}
.tvt-pagination a.current{background:var(--ink);color:#fff;border-color:var(--ink);}

/* ---------- 表格（覆盖正文全部 table，含 Markdown 裸 table，防 M26/M23-7）---------- */
table.tvt-spec,.tvt-content-main table,.tvt-page-main table{
  border-collapse:collapse;width:100%;margin:16px 0;font-size:14px;background:var(--paper);
}
table.tvt-spec th,table.tvt-spec td,.tvt-content-main table th,.tvt-content-main table td,
.tvt-page-main table th,.tvt-page-main table td{
  border:1px solid #cbd5e1;padding:9px 12px;text-align:left;vertical-align:top;
}
table.tvt-spec thead th,.tvt-content-main table thead th,.tvt-page-main table thead th{
  background:var(--ink);color:#fff;font-weight:600;
}
table.tvt-spec tbody tr:nth-child(even) td,.tvt-content-main table tbody tr:nth-child(even) td,
.tvt-page-main table tbody tr:nth-child(even) td{background:#EDF4F2;}

/* ---------- FAQ（裸 details，faq_dom=bare_details）---------- */
.tvt-faq-block{margin:28px 0;border-top:1px solid var(--line);padding-top:14px;}
.tvt-faq-block h2{font-size:20px;}
.tvt-faq-block details{border:1px solid var(--line);border-radius:10px;margin:8px 0;background:var(--paper);overflow:hidden;}
.tvt-faq-block summary{cursor:pointer;padding:12px 14px;font-weight:600;color:var(--ink);}
.tvt-faq-block summary::-webkit-details-marker{color:var(--accent);}
.tvt-faq-block details[open] summary{border-bottom:1px solid var(--line);}
.tvt-faq-block details p{padding:10px 14px;margin:0;color:var(--text);}

/* ---------- 页面（叶子页）---------- */
.tvt-page-wrap{padding:8px 0 40px;}
.tvt-page-main{max-width:880px;background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:var(--page-inset);}
.tvt-404{text-align:center;}

/* ---------- 首页 ---------- */
.tvt-hero{display:flex;align-items:center;gap:32px;padding:40px 0 28px;flex-wrap:wrap;}
.tvt-hero-text{flex:1 1 380px;}
.tvt-hero-sub{font-size:17px;color:var(--muted);margin:12px 0 22px;line-height:1.7;}
.tvt-hero-cta{display:flex;gap:14px;flex-wrap:wrap;}
.tvt-btn{display:inline-block;padding:11px 22px;border-radius:10px;border:1px solid var(--ink);color:var(--ink);font-weight:600;}
.tvt-btn-primary{background:var(--accent);border-color:var(--accent);color:var(--ink);}
.tvt-btn:hover{opacity:.9;color:var(--ink);}
.tvt-hero-art{flex:0 0 240px;text-align:center;}
.tvt-band{padding:34px 0;border-top:1px solid var(--line);}
.tvt-band-alt{background:var(--paper);border-radius:16px;}
.tvt-sec-title{font-size:24px;margin:0 0 8px;}
.tvt-sec-lead{color:var(--muted);margin:0 0 20px;line-height:1.7;}
.tvt-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.tvt-card{display:block;background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:20px;transition:transform .15s,box-shadow .15s;}
.tvt-card:hover{transform:translateY(-3px);box-shadow:0 10px 26px rgba(16,36,46,.12);color:var(--text);}
.tvt-card h3{margin:0 0 8px;font-size:18px;}
.tvt-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.6;}
.tvt-tags{display:flex;flex-wrap:wrap;gap:10px;}
.tvt-tag{background:rgba(27,179,160,.14);color:#0E6B5E;border:1px solid rgba(27,179,160,.4);padding:7px 14px;border-radius:20px;font-size:14px;font-weight:600;}
.tvt-baseline{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;}
.tvt-baseline-item{background:var(--paper);border:1px solid var(--line);border-left:4px solid var(--accent-2);border-radius:10px;padding:16px 18px;}
.tvt-baseline-item h3{margin:0 0 6px;font-size:17px;}
.tvt-baseline-item p{margin:0;color:var(--muted);font-size:14px;line-height:1.65;}
.tvt-feat-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:16px;}
.tvt-feat-list li{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:16px 18px;}
.tvt-feat-list a{font-weight:600;font-size:16px;color:var(--ink);}
.tvt-feat-list p{margin:8px 0 0;color:var(--muted);font-size:14px;line-height:1.6;}

/* ---------- 归档 ---------- */
.tvt-archive-list{columns:2;column-gap:28px;list-style:none;padding:0;margin:6px 0 18px;}
.tvt-archive-list li{break-inside:avoid;padding:4px 0;}
.tvt-archive-list a{color:var(--ink-2);}

/* ---------- 页脚 ---------- */
.tvt-footer{background:var(--ink);color:#CFE0DD;margin-top:30px;}
.tvt-footer-inner{max-width:1200px;margin:0 auto;padding:34px 24px;display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:24px;}
.tvt-footer h3{color:#fff;font-size:17px;margin:0 0 8px;}
.tvt-footer h4{color:#fff;font-size:15px;margin:0 0 8px;}
.tvt-footer a{display:block;color:#CFE0DD;padding:3px 0;}
.tvt-footer a:hover{color:var(--accent);}
.tvt-footer-note{font-size:13px;line-height:1.75;color:#AFC3BE;}
.tvt-footer-bar{border-top:1px solid rgba(255,255,255,.12);text-align:center;padding:14px;font-size:13px;color:#9DB0AC;}

/* ---------- 悬浮胶囊 ---------- */
.tvt-capsule{position:fixed;right:16px;top:50%;transform:translateY(-50%);z-index:50;display:flex;flex-direction:column;gap:8px;
  background:linear-gradient(180deg,var(--accent),#14897B);padding:10px;border-radius:30px;box-shadow:0 10px 28px rgba(16,36,46,.35);}
.tvt-cap-btn{display:flex;flex-direction:column;align-items:center;gap:2px;width:48px;height:48px;justify-content:center;
  background:#fff;color:var(--ink);border:0;border-radius:50%;cursor:pointer;font-size:12px;font-weight:700;}
.tvt-cap-btn:hover{filter:brightness(.95);}
.tvt-cap-btn svg{display:block;}
.tvt-card-pop{position:fixed;inset:0;background:rgba(16,36,46,.6);display:flex;align-items:center;justify-content:center;z-index:100;padding:20px;}
.tvt-card-pop[hidden]{display:none;}
.tvt-card-pop-inner{position:relative;background:#fff;border-radius:12px;padding:8px;max-height:92vh;overflow:auto;}
.tvt-card-pop-inner img{display:block;width:auto;height:auto;max-height:86vh;max-width:90vw;}
.tvt-card-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;border:0;background:var(--ink);color:#fff;font-size:20px;cursor:pointer;}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .tvt-layout-grid,.tvt-list-layout .tvt-layout-grid{grid-template-columns:1fr;}
  .tvt-toc-aside,.tvt-cat-side{position:static;max-height:none;}
  .tvt-card-grid{grid-template-columns:repeat(2,1fr);}
  .tvt-baseline,.tvt-feat-list{grid-template-columns:1fr;}
  .tvt-nav{display:none;position:absolute;top:var(--header-h);left:0;right:0;flex-direction:column;background:var(--ink);padding:10px;gap:4px;}
  .tvt-nav.tvt-nav-open{display:flex;}
  .tvt-nav-toggle{display:block;}
  .tvt-nav-group{position:static;}
  .tvt-nav-sub{position:static;display:block;background:transparent;box-shadow:none;padding:0 0 0 12px;}
  .tvt-nav-sub a{color:#DCEAE7;}
}
@media (max-width:640px){
  .tvt-card-grid{grid-template-columns:1fr;}
  .tvt-archive-list{columns:1;}
  .tvt-footer-inner{grid-template-columns:1fr;}
  .tvt-page-main{padding:24px;}
  .tvt-capsule{right:8px;}
}