:root{
  --bg:#F4F7FA;
  --ink:#0E2233;
  --cyan:#0FA3B1;
  --cyan-deep:#0B7E89;
  --amber:#E8913C;
  --text:#1A2733;
  --muted:#5A6B7B;
  --line:#D7E0E8;
  --card:#FFFFFF;
  --header-h:64px;
  --h2-inset:0px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px;line-height:1.75;
}
a{color:var(--cyan-deep);text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;height:auto;}

/* ===== Header ===== */
.trc-header{position:fixed;top:0;left:0;right:0;height:var(--header-h);z-index:50;
  background:rgba(14,34,51,.96);backdrop-filter:blur(6px);border-bottom:1px solid rgba(255,255,255,.08);}
.trc-header-inner{max-width:1180px;margin:0 auto;height:100%;padding:0 24px;display:flex;align-items:center;gap:24px;}
.trc-brand{color:#fff;font-weight:700;font-size:19px;letter-spacing:.5px;white-space:nowrap;}
.trc-nav{display:flex;gap:22px;margin-left:auto;}
.trc-nav a{color:#D7E4EE;font-size:15px;padding:6px 2px;border-bottom:2px solid transparent;}
.trc-nav a:hover{color:#fff;text-decoration:none;border-bottom-color:var(--cyan);}
.trc-nav a.trc-active{color:#fff;border-bottom-color:var(--amber);}
.trc-nav-toggle{display:none;background:none;border:1px solid rgba(255,255,255,.3);color:#fff;font-size:20px;border-radius:8px;width:42px;height:38px;cursor:pointer;}

/* ===== Container ===== */
.trc-container{max-width:1180px;margin:0 auto;padding:calc(var(--header-h) + 28px) 24px 60px;}

/* ===== Breadcrumb ===== */
.trc-breadcrumb{margin:0 0 22px;padding-left:var(--h2-inset);}
.trc-breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;font-size:13.5px;color:var(--muted);}
.trc-breadcrumb li:not(:last-child)::after{content:"›";margin-left:8px;color:#9FB2C0;}
.trc-breadcrumb a{color:var(--muted);}
.trc-breadcrumb a:hover{color:var(--cyan-deep);}

/* ===== Detail layout ===== */
.trc-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:36px;align-items:start;}
.trc-content-main{min-width:0;}
.trc-content-main h1{font-size:28px;line-height:1.35;margin:0 0 18px;color:var(--ink);}
.trc-content-main h2{font-size:21px;margin:30px 0 12px;padding-left:12px;border-left:4px solid var(--cyan);color:var(--ink);scroll-margin-top:80px;}
.trc-content-main h3{font-size:17px;margin:22px 0 10px;color:var(--cyan-deep);scroll-margin-top:80px;}
.trc-content-main p{margin:0 0 14px;}
.trc-content-main ul,.trc-content-main ol{margin:0 0 14px;padding-left:24px;}
.trc-content-main li{margin:6px 0;}
.trc-content-main blockquote{margin:16px 0;padding:14px 18px;background:#EAF6F8;border-left:4px solid var(--cyan);border-radius:8px;color:var(--ink);}
.trc-content-main blockquote p{margin:0;}
.trc-content-main .trc-summary{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin:0 0 18px;box-shadow:0 2px 10px rgba(14,34,51,.04);}
.trc-content-main .trc-keywords{font-size:14px;color:var(--muted);margin-bottom:18px;}
.trc-content-main .trc-keywords b{color:var(--ink);}
.trc-content-main .trc-update{font-size:13px;color:var(--muted);margin:0 0 20px;}
.trc-content-main .trc-conclusion{background:#FFF6EC;border:1px solid #F3D8B6;border-radius:12px;padding:16px 20px;margin:18px 0;}
.trc-content-main .trc-conclusion p{margin:0 0 8px;}
.trc-content-main .trc-conclusion ol{padding-left:22px;}

/* tables: 覆盖全部正文 table（含 Markdown 裸 table）+ table.trc-spec */
.trc-content-main table,.trc-page-main table,table.trc-spec{
  width:100%;border-collapse:collapse;margin:16px 0;font-size:14.5px;
  border:1px solid #cbd5e1;background:#fff;
}
.trc-content-main table th,.trc-page-main table th,table.trc-spec th{
  background:var(--ink);color:#fff;padding:10px 12px;text-align:left;font-weight:600;
}
.trc-content-main table td,.trc-page-main table td,table.trc-spec td{
  border:1px solid #cbd5e1;padding:9px 12px;
}
.trc-content-main table tr:nth-child(even) td,.trc-page-main table tr:nth-child(even) td,table.trc-spec tr:nth-child(even) td{
  background:#F1F6FA;
}

/* FAQ (裸 details) */
.trc-faq{margin:22px 0;}
.trc-faq details{border:1px solid var(--line);border-radius:10px;background:#fff;margin:10px 0;overflow:hidden;}
.trc-faq details[open]{border-color:var(--cyan);}
.trc-faq summary{cursor:pointer;padding:13px 16px;font-weight:600;color:var(--ink);list-style:none;}
.trc-faq summary::-webkit-details-marker{display:none;}
.trc-faq summary::before{content:"+";color:var(--cyan);font-weight:700;margin-right:10px;}
.trc-faq details[open] summary::before{content:"−";}
.trc-faq-a{padding:0 16px 14px;color:var(--text);}
.trc-faq-a p{margin:0;}

/* related reading */
.trc-related{margin:24px 0;padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:12px;}
.trc-related h2{border:none;padding:0;margin:0 0 10px;font-size:18px;}
.trc-related ul{margin:0;padding-left:20px;}

/* case study */
.trc-case{margin:22px 0;padding:14px 18px;border:1px dashed var(--cyan);border-radius:12px;background:#EAF6F8;}
.trc-case-title{font-weight:700;color:var(--cyan-deep);margin-bottom:6px;}

/* TOC */
.trc-toc-aside{position:sticky;top:calc(var(--header-h) + 20px);max-height:calc(100vh - var(--header-h) - 40px);overflow-y:auto;}
.trc-toc-panel{border:1px solid var(--line);border-radius:12px;background:#fff;padding:12px 14px;}
.trc-toc-panel summary{cursor:pointer;font-weight:700;color:var(--ink);margin-bottom:8px;}
.trc-toc-panel summary::-webkit-details-marker{display:none;}
.trc-toc ol{list-style:none;margin:0;padding:0;counter-reset:toc;}
.trc-toc li{counter-increment:toc;margin:7px 0;font-size:14px;line-height:1.4;}
.trc-toc li a{color:var(--muted);}
.trc-toc li a:hover{color:var(--cyan-deep);}
.trc-toc li::before{content:counter(toc) ". ";color:var(--cyan);font-weight:600;}

/* ===== List layout ===== */
.trc-list-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:32px;align-items:start;}
.trc-cat-side{position:sticky;top:calc(var(--header-h) + 20px);}
.trc-cat-panel{border:1px solid var(--line);border-radius:12px;background:#fff;padding:12px 14px;}
.trc-cat-panel summary{cursor:pointer;font-weight:700;color:var(--ink);margin-bottom:8px;}
.trc-cat-panel summary::-webkit-details-marker{display:none;}
.trc-category-list{list-style:none;margin:0;padding:0;}
.trc-category-list li{display:flex;justify-content:space-between;align-items:center;padding:8px 6px;border-radius:8px;}
.trc-category-list li a{color:var(--text);}
.trc-category-list li.trc-active{background:#EAF6F8;}
.trc-category-list li.trc-active a{color:var(--cyan-deep);font-weight:600;}
.trc-cat-count{font-size:12px;color:var(--muted);background:#EEF3F7;border-radius:10px;padding:1px 8px;}
.trc-list-title{font-size:26px;margin:0 0 8px;color:var(--ink);}
.trc-list-intro{color:var(--muted);margin:0 0 22px;}
.trc-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;}
.trc-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 18px 20px;transition:transform .15s,box-shadow .15s;}
.trc-card:hover{transform:translateY(-3px);box-shadow:0 10px 26px rgba(14,34,51,.10);}
.trc-card-link h3{font-size:17px;margin:0 0 8px;color:var(--ink);}
.trc-card-desc{font-size:14px;color:var(--muted);margin:0;line-height:1.6;}
.trc-list-faq{margin-top:30px;}

/* ===== Page main ===== */
.trc-page-main{max-width:820px;margin:0 auto;}
.trc-page-main h1{font-size:28px;margin:0 0 18px;color:var(--ink);}
.trc-page-main h2{font-size:21px;margin:28px 0 12px;padding-left:12px;border-left:4px solid var(--cyan);color:var(--ink);}
.trc-page-main h3{font-size:17px;margin:20px 0 10px;color:var(--cyan-deep);}
.trc-page-main p{margin:0 0 14px;}
.trc-page-main ul,.trc-page-main ol{margin:0 0 14px;padding-left:24px;}
.trc-page-main li{margin:6px 0;}
.trc-page-main blockquote{margin:16px 0;padding:14px 18px;background:#EAF6F8;border-left:4px solid var(--cyan);border-radius:8px;}
.trc-page-main .trc-contact-mail{font-weight:600;color:var(--cyan-deep);}

/* ===== Home ===== */
.trc-hero{background:linear-gradient(135deg,#0E2233,#13415a);border-radius:20px;padding:54px 46px;color:#fff;margin-bottom:34px;}
.trc-hero h1{font-size:36px;margin:0 0 14px;line-height:1.25;}
.trc-hero p{font-size:17px;color:#C9DCE6;max-width:760px;margin:0 0 22px;}
.trc-hero .trc-hero-cta{display:flex;gap:14px;flex-wrap:wrap;}
.trc-btn{display:inline-block;background:var(--amber);color:#1a1205;font-weight:700;padding:12px 22px;border-radius:10px;}
.trc-btn:hover{text-decoration:none;filter:brightness(1.05);}
.trc-btn-ghost{background:transparent;border:1px solid rgba(255,255,255,.4);color:#fff;}
.trc-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:0 0 36px;}
.trc-stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;text-align:center;}
.trc-stat b{display:block;font-size:30px;color:var(--cyan-deep);}
.trc-stat span{font-size:14px;color:var(--muted);}
.trc-section{margin:0 0 38px;}
.trc-section h2{font-size:24px;color:var(--ink);margin:0 0 6px;}
.trc-section .trc-section-sub{color:var(--muted);margin:0 0 20px;}
.trc-prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.trc-prod-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;transition:transform .15s,box-shadow .15s;}
.trc-prod-card:hover{transform:translateY(-3px);box-shadow:0 10px 26px rgba(14,34,51,.10);}
.trc-prod-card h3{font-size:18px;margin:0 0 10px;color:var(--ink);}
.trc-prod-card p{font-size:14px;color:var(--muted);margin:0 0 14px;}
.trc-prod-card a{font-weight:600;}
.trc-persp{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.trc-persp-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;}
.trc-persp-card h4{margin:0 0 6px;color:var(--cyan-deep);font-size:16px;}
.trc-persp-card span{font-size:13px;color:var(--muted);}
.trc-caps{display:flex;flex-wrap:wrap;gap:12px;}
.trc-cap{background:#EAF6F8;color:var(--cyan-deep);border-radius:999px;padding:8px 16px;font-size:14px;font-weight:600;}
.trc-cta-band{background:var(--ink);color:#fff;border-radius:18px;padding:38px 40px;text-align:center;}
.trc-cta-band h2{color:#fff;margin:0 0 10px;}
.trc-cta-band p{color:#C9DCE6;margin:0 0 20px;}

/* ===== Float capsule ===== */
.trc-float{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:10px;}
.trc-float-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;width:56px;height:56px;border:none;border-radius:28px;
  background:linear-gradient(135deg,var(--cyan),var(--cyan-deep));color:#fff;font-size:18px;cursor:pointer;box-shadow:0 6px 18px rgba(15,163,177,.45);}
.trc-float-btn span{font-size:11px;margin-top:2px;}
.trc-float-btn:hover{filter:brightness(1.06);}
.trc-card-pop{position:fixed;inset:0;z-index:80;background:rgba(10,20,30,.55);display:flex;align-items:center;justify-content:center;}
.trc-card-pop[hidden]{display:none;}
.trc-card-pop-inner{position:relative;background:#fff;border-radius:12px;padding:10px;box-shadow:0 20px 60px rgba(0,0,0,.4);}
.trc-card-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;border:none;background:var(--ink);color:#fff;font-size:20px;cursor:pointer;}

/* ===== Footer ===== */
.trc-footer{background:var(--ink);color:#C9DCE6;margin-top:40px;}
.trc-footer-inner{max-width:1180px;margin:0 auto;padding:46px 24px 24px;display:grid;grid-template-columns:1.4fr 2fr;gap:30px;}
.trc-footer-name{color:#fff;font-size:20px;font-weight:700;margin-bottom:10px;}
.trc-footer-desc{font-size:14px;line-height:1.7;max-width:420px;}
.trc-footer-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.trc-footer-cols h4{color:#fff;font-size:15px;margin:0 0 12px;}
.trc-footer-cols a{display:block;color:#AFC4D1;font-size:14px;margin:7px 0;}
.trc-footer-cols a:hover{color:#fff;}
.trc-footer-bottom{border-top:1px solid rgba(255,255,255,.1);text-align:center;padding:16px;font-size:13px;color:#8FA6B4;}

.trc-notfound{text-align:center;padding:80px 0;}
.trc-notfound h1{font-size:32px;}

/* ===== Responsive (断点 1024，与 responsive_folding 一致) ===== */
@media (max-width:1024px){
  .trc-nav{display:none;position:absolute;top:var(--header-h);left:0;right:0;flex-direction:column;background:var(--ink);padding:14px 24px;gap:6px;}
  .trc-nav.trc-open{display:flex;}
  .trc-nav-toggle{display:block;margin-left:auto;}
  .trc-detail-layout{grid-template-columns:1fr;}
  .trc-toc-aside{position:static;max-height:none;}
  .trc-list-layout{grid-template-columns:1fr;}
  .trc-cat-side{position:static;}
  .trc-stats{grid-template-columns:repeat(2,1fr);}
  .trc-prod-grid,.trc-persp{grid-template-columns:1fr 1fr;}
  .trc-hero{padding:38px 26px;}
  .trc-hero h1{font-size:28px;}
}
@media (max-width:640px){
  .trc-prod-grid,.trc-persp,.trc-stats{grid-template-columns:1fr;}
  .trc-footer-inner{grid-template-columns:1fr;}
  .trc-container{padding-top:calc(var(--header-h) + 16px);}
}