/* ptc — 精密计量仪表盘主题（独立设计，零复用） */
:root{
  --bg:#EEF2F6;
  --surface:#FFFFFF;
  --ink:#0C1117;
  --ink-soft:#46566A;
  --line:#D5DEE7;
  --line-strong:#B9C6D3;
  --primary:#0E7C8B;
  --primary-2:#0FA3A3;
  --accent:#E8833A;
  --ok:#1E9E6A;
  --header-h:64px;
  --h2-inset:24px;
  --maxw:1180px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background-color:var(--bg);
  background-image:
    linear-gradient(rgba(14,124,139,0.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(14,124,139,0.05) 1px,transparent 1px);
  background-size:24px 24px;
  line-height:1.75;
  font-size:16px;
  padding-top:var(--header-h);
}
a{color:var(--primary);text-decoration:none;}
a:hover{color:var(--accent);}
img{max-width:100%;height:auto;}

/* ===== Header ===== */
.ptc-header{
  position:fixed;top:0;left:0;right:0;height:var(--header-h);z-index:1000;
  background:linear-gradient(120deg,#0C1117 0%,#14202C 60%,#0E7C8B 140%);
  box-shadow:0 2px 14px rgba(12,17,23,.28);
}
.ptc-header-inner{
  max-width:var(--maxw);margin:0 auto;height:100%;
  display:flex;align-items:center;gap:18px;padding:0 24px;
}
.ptc-logo{font-size:20px;font-weight:800;color:#fff;letter-spacing:.5px;white-space:nowrap;}
.ptc-logo-accent{color:var(--primary-2);}
.ptc-nav-toggle{display:none;background:none;border:1px solid rgba(255,255,255,.4);color:#fff;font-size:20px;border-radius:8px;padding:4px 10px;cursor:pointer;}
.ptc-nav{flex:1;}
.ptc-nav-list{list-style:none;display:flex;align-items:center;gap:4px;margin:0;padding:0;flex-wrap:wrap;}
.ptc-nav-item{position:relative;}
.ptc-nav-item>a,.ptc-nav-summary{
  display:block;padding:10px 14px;color:#E6EDF3;font-size:15px;background:none;border:none;cursor:pointer;font-family:inherit;
}
.ptc-nav-item>a:hover,.ptc-nav-summary:hover{color:#fff;background:rgba(15,163,163,.22);border-radius:8px;}
.ptc-has-sub>.ptc-nav-sub{
  display:none;position:absolute;top:100%;left:0;min-width:180px;
  background:#11202C;border:1px solid rgba(255,255,255,.12);border-radius:10px;
  padding:6px;box-shadow:0 10px 30px rgba(0,0,0,.35);z-index:50;
}
.ptc-has-sub:hover>.ptc-nav-sub{display:block;}
.ptc-nav-sub a{display:block;padding:8px 12px;color:#DCE6EE;border-radius:6px;white-space:nowrap;}
.ptc-nav-sub a:hover{background:rgba(15,163,163,.25);color:#fff;}
.ptc-has-sub.ptc-open>.ptc-nav-sub{display:block;}

/* ===== Page layout ===== */
.ptc-page{max-width:var(--maxw);margin:0 auto;padding:0 24px 64px;}
.ptc-main{padding:28px 0 0;}
.ptc-layout-grid{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:36px;margin-top:14px;}
.ptc-list-layout .ptc-layout-grid{grid-template-columns:minmax(0,1fr) 240px;gap:32px;}

/* ===== Breadcrumb ===== */
.ptc-breadcrumb{padding:0 0 4px;}
.ptc-breadcrumb-list{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;font-size:13px;color:var(--ink-soft);}
.ptc-breadcrumb-list li{display:flex;align-items:center;}
.ptc-breadcrumb-list li:not(:last-child)::after{content:"›";margin-left:8px;color:var(--line-strong);}
.ptc-breadcrumb-list a{color:var(--ink-soft);}
.ptc-breadcrumb-list a:hover{color:var(--primary);}
.ptc-breadcrumb-current{color:var(--primary);font-weight:600;}

/* ===== Content ===== */
.ptc-content-main,.ptc-page-main{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:32px var(--h2-inset);box-shadow:0 6px 24px rgba(12,17,23,.05);}
.ptc-content-main h1{font-size:30px;line-height:1.35;margin:0 0 18px;color:var(--ink);}
.ptc-content-main h2{font-size:23px;margin:34px 0 14px;padding-left:14px;border-left:4px solid var(--primary);color:#0E2A30;}
.ptc-content-main h3{font-size:19px;margin:24px 0 10px;color:#13414A;}
.ptc-content-main p{margin:12px 0;color:#1B2733;}
.ptc-content-main ul,.ptc-content-main ol{padding-left:24px;margin:12px 0;}
.ptc-content-main li{margin:6px 0;}
.ptc-content-main strong{color:var(--primary);}
.ptc-content-main blockquote{
  margin:16px 0;padding:14px 18px;background:linear-gradient(180deg,#F2F8F9,#EAF3F4);
  border-left:4px solid var(--primary-2);border-radius:10px;color:#16323A;font-size:15px;
}
.ptc-content-main code{background:#EAF1F4;padding:2px 6px;border-radius:5px;font-family:"SFMono-Regular",Consolas,monospace;font-size:14px;color:#0E7C8B;}
.ptc-meta-time{font-size:13px;color:var(--ink-soft);margin:6px 0 0;}
.ptc-meta-time time{color:var(--primary);}

/* ===== Tables ===== */
.ptc-content-main table,.ptc-page-main table,table.ptc-spec{
  width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;
  border:1px solid var(--line-strong);
}
.ptc-content-main th,.ptc-page-main th,table.ptc-spec th{
  background:var(--primary);color:#fff;text-align:left;padding:10px 12px;font-weight:600;border:1px solid var(--line-strong);
}
.ptc-content-main td,.ptc-page-main td,table.ptc-spec td{
  padding:9px 12px;border:1px solid var(--line-strong);color:#1B2733;
}
.ptc-content-main tbody tr:nth-child(even),.ptc-page-main tbody tr:nth-child(even),table.ptc-spec tbody tr:nth-child(even){background:#F4F8F9;}

/* ===== TOC ===== */
.ptc-toc-aside{position:sticky;top:calc(var(--header-h) + 16px);max-height:calc(100vh - var(--header-h) - 32px);overflow-y:auto;}
.ptc-toc-panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;}
.ptc-toc-summary{cursor:pointer;font-weight:700;color:var(--primary);font-size:15px;list-style:none;}
.ptc-toc-summary::-webkit-details-marker{display:none;}
.ptc-toc-summary::after{content:"▾";float:right;transition:transform .2s;}
.ptc-toc-panel:not([open]) .ptc-toc-summary::after{transform:rotate(-90deg);}
.ptc-toc-list{margin:10px 0 0;padding-left:18px;}
.ptc-toc-list li{margin:7px 0;font-size:13.5px;line-height:1.5;}
.ptc-toc-list a{color:var(--ink-soft);}
.ptc-toc-list a:hover{color:var(--primary);}

/* ===== Category panel (list pages) ===== */
.ptc-cat-side{}
.ptc-cat-panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;}
.ptc-cat-summary{cursor:pointer;font-weight:700;color:var(--primary);font-size:15px;list-style:none;}
.ptc-cat-summary::-webkit-details-marker{display:none;}
.ptc-cat-summary::after{content:"▾";float:right;transition:transform .2s;}
.ptc-cat-panel:not([open]) .ptc-cat-summary::after{transform:rotate(-90deg);}
.ptc-category-list{list-style:none;margin:12px 0 0;padding:0;}
.ptc-category-item{display:flex;justify-content:space-between;align-items:center;padding:9px 10px;border-radius:8px;margin:2px 0;color:var(--ink-soft);}
.ptc-category-item a{color:var(--ink-soft);flex:1;}
.ptc-category-item:hover{background:#EAF3F4;}
.ptc-category-active{background:#E3F1F2;}
.ptc-category-active a{color:var(--primary);font-weight:700;}
.ptc-category-count{font-size:12px;background:#EAF1F4;color:var(--primary);border-radius:20px;padding:1px 9px;}

/* ===== Card grid ===== */
.ptc-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px;margin:18px 0;}
.ptc-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;transition:transform .15s,box-shadow .15s;border-top:3px solid var(--primary);}
.ptc-card:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(14,124,139,.16);}
.ptc-card h3{margin:0 0 8px;font-size:18px;color:#0E2A30;}
.ptc-card p{margin:6px 0;font-size:14px;color:var(--ink-soft);}
.ptc-card-meta{font-size:12.5px;color:var(--primary);margin-top:10px;}
.ptc-card .ptc-tag{display:inline-block;background:#EAF3F4;color:var(--primary);border-radius:20px;padding:2px 10px;font-size:12px;margin:4px 4px 0 0;}

/* ===== FAQ ===== */
.ptc-faq{margin:36px 0 10px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px var(--h2-inset);}
.ptc-faq-title{font-size:23px;color:#0E2A30;margin:0 0 14px;padding-left:14px;border-left:4px solid var(--accent);}
.ptc-faq-item{border:1px solid var(--line);border-radius:10px;margin:10px 0;padding:0 14px;background:#FBFDFE;}
.ptc-faq-item summary{cursor:pointer;padding:13px 0;font-weight:600;color:#16323A;list-style:none;}
.ptc-faq-item summary::-webkit-details-marker{display:none;}
.ptc-faq-item summary::after{content:"+";float:right;color:var(--primary);font-size:20px;line-height:1;}
.ptc-faq-item[open] summary::after{content:"−";}
.ptc-faq-answer{padding:0 0 14px;color:#1B2733;}

/* ===== Related ===== */
.ptc-related{margin:30px 0 0;}
.ptc-related h2{font-size:21px;color:#0E2A30;padding-left:14px;border-left:4px solid var(--accent);}
.ptc-related ul{list-style:none;padding:0;margin:12px 0;}
.ptc-related li{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:8px 0;}
.ptc-related a{font-weight:600;}
.ptc-related span{display:block;color:var(--ink-soft);font-size:13.5px;margin-top:3px;}

/* ===== Float capsule ===== */
.ptc-float{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:900;display:flex;flex-direction:column;gap:10px;align-items:flex-end;}
.ptc-float-btn{height:44px;padding:0 16px;border-radius:22px;display:flex;align-items:center;justify-content:center;gap:7px;color:#fff;font-size:20px;cursor:pointer;border:none;box-shadow:0 6px 18px rgba(12,17,23,.28);background:linear-gradient(135deg,var(--primary),var(--primary-2));}
.ptc-float-btn.ptc-float-mail{background:linear-gradient(135deg,var(--accent),#F0A35A);}
.ptc-float-btn.ptc-float-card{background:linear-gradient(135deg,#16384A,#0E7C8B);}
.ptc-float-btn:hover{filter:brightness(1.08);}
.ptc-float-btn span{font-size:13px;font-weight:600;white-space:nowrap;letter-spacing:1px;}
.ptc-card-pop{display:none;position:fixed;right:80px;top:50%;transform:translateY(-50%);z-index:901;background:#fff;border-radius:10px;padding:8px;box-shadow:0 12px 40px rgba(0,0,0,.35);}
.ptc-card-pop[open],.ptc-card-pop.ptc-show{display:block;}
.ptc-card-pop img{width:300px;height:500px;display:block;border-radius:6px;}
.ptc-card-pop .ptc-card-close{position:absolute;top:-12px;right:-12px;width:30px;height:30px;border-radius:50%;background:#16384A;color:#fff;border:none;cursor:pointer;font-size:16px;}

/* ===== Home hero ===== */
.ptc-hero{background:linear-gradient(120deg,#0C1117,#16323A 70%,#0E7C8B);border-radius:18px;padding:48px 40px;color:#E6EDF3;margin:24px 0 0;position:relative;overflow:hidden;}
.ptc-hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:26px 26px;pointer-events:none;}
.ptc-hero h1{font-size:38px;margin:0 0 14px;color:#fff;position:relative;}
.ptc-hero p{font-size:17px;max-width:680px;color:#C7D6DD;position:relative;}
.ptc-hero .ptc-hero-cta{display:inline-block;margin-top:22px;background:var(--accent);color:#fff;padding:12px 26px;border-radius:30px;font-weight:700;position:relative;}
.ptc-hero .ptc-hero-cta:hover{color:#fff;filter:brightness(1.06);}
.ptc-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px;margin:28px 0;}
.ptc-stat{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;text-align:center;}
.ptc-stat b{display:block;font-size:28px;color:var(--primary);font-variant-numeric:tabular-nums;}
.ptc-stat span{font-size:13.5px;color:var(--ink-soft);}
.ptc-section-title{font-size:26px;color:#0E2A30;margin:38px 0 6px;}
.ptc-section-sub{color:var(--ink-soft);margin:0 0 14px;}

/* ===== Pill / capsule scene on home ===== */
.ptc-pills{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0;}
.ptc-pill{background:var(--surface);border:1px solid var(--line);border-radius:30px;padding:8px 16px;font-size:13.5px;color:var(--primary);}

/* ===== Footer ===== */
.ptc-footer{background:#0C1117;color:#C7D6DD;margin-top:48px;}
.ptc-footer-inner{max-width:var(--maxw);margin:0 auto;padding:40px 24px 24px;}
.ptc-footer-cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:28px;}
.ptc-footer-title{font-size:15px;color:#fff;margin:0 0 12px;}
.ptc-footer-text{font-size:13.5px;line-height:1.7;color:#9FB0BF;}
.ptc-footer-list{list-style:none;margin:0;padding:0;}
.ptc-footer-list li{margin:7px 0;}
.ptc-footer-list a{color:#C7D6DD;font-size:13.5px;}
.ptc-footer-list a:hover{color:var(--primary-2);}
.ptc-footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:28px;padding-top:18px;text-align:center;}
.ptc-footer-bottom p{margin:0;font-size:13px;color:#7E8C99;}

/* ===== Tags ===== */
.tag-text{display:inline-block;background:#EAF3F4;color:var(--primary);border-radius:20px;padding:2px 10px;font-size:12px;margin:2px 4px 0 0;}

/* ===== Responsive ===== */
@media (max-width:1024px){
  .ptc-nav-toggle{display:block;}
  .ptc-nav{display:none;position:absolute;top:var(--header-h);left:0;right:0;background:#11202C;padding:10px;}
  .ptc-nav.ptc-nav-active{display:block;}
  .ptc-nav-list{flex-direction:column;align-items:stretch;gap:0;}
  .ptc-has-sub>.ptc-nav-sub{position:static;display:none;box-shadow:none;background:transparent;border:none;padding-left:14px;}
  .ptc-has-sub.ptc-open>.ptc-nav-sub{display:block;}
  .ptc-layout-grid,.ptc-list-layout .ptc-layout-grid{grid-template-columns:1fr;gap:20px;}
  .ptc-toc-aside{position:static;max-height:none;}
  .ptc-content-main,.ptc-page-main,.ptc-faq{padding:22px 18px;}
  :root{--h2-inset:18px;}
  .ptc-footer-cols{grid-template-columns:1fr 1fr;}
  .ptc-hero{padding:32px 22px;}
  .ptc-hero h1{font-size:28px;}
  .ptc-float{right:10px;}
  .ptc-card-pop{right:64px;}
}
@media (max-width:600px){
  .ptc-footer-cols{grid-template-columns:1fr;}
  .ptc-card-grid{grid-template-columns:1fr;}
}