/* ========= 技术支持 Banner ========= */
.ptc-hero{position:relative;display:flex;align-items:center;min-height:347px;padding:54px 0 67px;background:linear-gradient(135deg,#061535 0%,#0d2b6b 45%,#15419e 100%);color:#fff;overflow:hidden}
.ptc-hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 18% 28%,rgba(30,106,224,.25) 0%,transparent 50%),radial-gradient(circle at 82% 72%,rgba(0,224,195,.15) 0%,transparent 50%);pointer-events:none}
.ptc-hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);background-size:60px 60px;pointer-events:none}
.ptc-hero-overlay{position:absolute;inset:0;z-index:1}
.ptc-hero-inner{position:relative;z-index:2;text-align:center}
.ptc-hero-crumb{font-size:14px;color:rgba(255,255,255,.6);display:flex;align-items:center;justify-content:center;gap:8px;margin-bottom:22px;letter-spacing:.5px}
.ptc-hero-crumb a{color:rgba(255,255,255,.8);text-decoration:none;transition:color .3s}
.ptc-hero-crumb a:hover{color:#fff}
.ptc-crumb-sep{opacity:.4}
.ptc-hero-eyebrow{display:inline-block;font-size:12px;font-weight:600;letter-spacing:4px;color:#00e0c3;padding:6px 18px;border:1px solid rgba(0,224,195,.3);border-radius:999px;background:rgba(0,224,195,.06);margin-bottom:24px}
.ptc-hero-title{font-size:42px;font-weight:700;line-height:1.5;letter-spacing:3px;margin-bottom:16px;white-space:pre-line}
.ptc-hero-sub{font-size:16px;color:rgba(255,255,255,.7);max-width:760px;margin:0 auto;line-height:2;letter-spacing:1px;white-space:pre-line}
.ptc-hero-badge{display:inline-flex;align-items:center;gap:8px;padding:7px 20px;border:1px solid rgba(255,255,255,.2);border-radius:999px;font-size:13px;color:rgba(255,255,255,.8);letter-spacing:.5px;margin-top:24px;background:rgba(255,255,255,.05);backdrop-filter:blur(10px)}
.ptc-hero-badge svg{width:14px;height:14px}

/* ========= yb 风格正文区（白底） ========= */
.yb-tech-section{padding:72px 0 96px;background:#fff;color:#1a2238;font-family:"Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif}
.yb-caliper{height:14px;border-left:2px solid #1a3a5c;border-right:2px solid #1a3a5c;background:repeating-linear-gradient(90deg,#cbd5e1 0 1px,transparent 1px 10px),repeating-linear-gradient(90deg,#94a3b8 0 1px,transparent 1px 50px);position:relative;margin:10px 0 4px;opacity:.9}
.yb-caliper::after{content:"0";position:absolute;left:50%;top:-2px;transform:translateX(-50%);font-family:"Rajdhani","SFMono-Regular",Consolas,monospace;font-size:11px;color:#1a3a5c;background:#fff;padding:0 4px;letter-spacing:1px}
.yb-eyebrow{display:flex;align-items:center;gap:10px;font-family:"Rajdhani","SFMono-Regular",Consolas,monospace;font-size:13px;letter-spacing:3px;color:#1a3a5c;text-transform:uppercase;margin-bottom:6px}
.yb-eyebrow::before{content:"";width:34px;height:1px;background:#1a3a5c}
.yb-eyebrow::after{content:"";width:6px;height:6px;border-radius:50%;background:#1a3a5c}
.yb-page-title{font-size:clamp(28px,4vw,44px);font-weight:900;margin:18px 0 14px;letter-spacing:.5px;color:#1a2238;line-height:1.25}
.yb-sec-title{font-size:clamp(22px,3vw,30px);font-weight:900;margin:12px 0 10px;color:#1a2238;line-height:1.3}
.yb-lead{color:#475569;font-size:17px;max-width:760px;line-height:1.8}
.yb-lead strong{color:#1a2238;font-weight:600}
.yb-mt40{margin-top:40px}
.yb-data-src{font-size:12px;color:#94a3b8;margin-top:14px;padding-left:4px;letter-spacing:.3px}

/* ========= Figure 结构示意图 ========= */
.yb-figure{margin-top:40px;padding:32px;border:1px solid #e5e9f2;border-radius:8px;background:#fafbfd}
.yb-fig-title{font-size:20px;font-weight:700;color:#1a2238;margin:12px 0 4px;letter-spacing:.3px}
.yb-fig-desc{font-size:14px;color:#64748b;margin:0 0 18px;line-height:1.7}
.yb-fig-svg{display:block;width:100%;max-width:900px;height:auto;margin:0 auto}
.yb-fig-caption{font-size:13px;color:#64748b;margin-top:18px;padding:14px 16px;background:#f1f5f9;border-radius:6px;line-height:1.8;border-left:3px solid #1a3a5c}
.yb-fig-caption b{color:#1a2238;font-weight:600}

/* ========= SELECTION 决策流程 ========= */
.yb-flow{display:flex;align-items:stretch;gap:0;flex-wrap:wrap;margin-top:24px}
.yb-flow-node{flex:1 1 0;min-width:180px;background:#fff;border:1px solid #e5e9f2;border-radius:8px;padding:20px 18px;position:relative;transition:border-color .25s,box-shadow .25s,transform .25s}
.yb-flow-node:hover{border-color:rgba(26,58,92,.4);box-shadow:0 12px 32px rgba(15,23,42,.06);transform:translateY(-2px)}
.yb-fn-no{display:inline-block;font-family:"Rajdhani","SFMono-Regular",Consolas,monospace;font-size:12px;letter-spacing:2px;color:#00c2a8;font-weight:700;padding:3px 10px;background:rgba(0,194,168,.08);border:1px solid rgba(0,194,168,.3);border-radius:99px;margin-bottom:10px}
.yb-flow-node h4{font-size:16px;font-weight:700;color:#1a2238;margin:0 0 8px;line-height:1.4}
.yb-flow-node h4 a{color:inherit;text-decoration:none;transition:color .25s}
.yb-flow-node h4 a:hover{color:#1a3a5c}
.yb-flow-node p{font-size:13px;color:#64748b;line-height:1.7;margin:0}
.yb-flow-arrow{flex:0 0 32px;display:flex;align-items:center;justify-content:center;font-size:24px;color:#1a3a5c;font-weight:300;font-family:"Rajdhani",sans-serif}

/* ========= COMPARISON 对比表格 ========= */
.yb-table-scroll{overflow-x:auto;margin-top:24px;border:1px solid #e5e9f2;border-radius:8px;background:#fff;-webkit-overflow-scrolling:touch}
.yb-compare-table{width:100%;border-collapse:collapse;min-width:760px;font-size:14px;background:#fff}
.yb-compare-table th,.yb-compare-table td{padding:14px 16px;text-align:left;border-bottom:1px solid #eef2f7;vertical-align:top}
.yb-compare-table thead th{background:#1a3a5c;color:#fff;font-weight:700;font-size:13.5px;letter-spacing:.5px;white-space:nowrap;border-bottom:none;vertical-align:middle}
.yb-compare-table thead th.yb-compare-dim{background:#0f2640;text-transform:uppercase;letter-spacing:1.5px;font-size:12px}
.yb-compare-table tbody tr:nth-child(even){background:#f7f9fc}
.yb-compare-table tbody tr:hover{background:rgba(0,194,168,.06)}
.yb-compare-table tbody td.yb-compare-dim{background:#eef2f7;color:#1a2238;font-weight:600;white-space:nowrap;width:140px}
.yb-compare-table tbody td.yb-compare-dim b{font-weight:700;color:#1a3a5c}
.yb-compare-table tbody td{color:#475569;line-height:1.7}
.yb-compare-th-link{display:flex;flex-direction:column;align-items:center;gap:8px;color:#fff!important;text-decoration:none;text-align:center}
.yb-compare-th-img{width:56px;height:56px;border-radius:8px;overflow:hidden;background:rgba(255,255,255,.1);display:flex;align-items:center;justify-content:center;flex-shrink:0;border:1px solid rgba(255,255,255,.2)}
.yb-compare-th-img img{width:100%;height:100%;object-fit:cover}
.yb-compare-th-name{font-size:14px;font-weight:700;line-height:1.4;display:block;max-width:160px}
.yb-compare-empty{text-align:center;padding:40px 16px;color:#94a3b8;font-size:14px;background:#f9fafb}

/* ========= GLOSSARY 术语表 ========= */
.yb-cards{display:grid;gap:18px;margin-top:24px}
.yb-grid-3{grid-template-columns:repeat(3,1fr)}
.yb-card{background:#fff;border:1px solid #e5e9f2;border-radius:8px;padding:22px 24px;position:relative;transition:border-color .25s,transform .25s,box-shadow .25s;overflow:hidden}
.yb-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:linear-gradient(180deg,#1a3a5c 0%,#00c2a8 100%);opacity:.85}
.yb-card:hover{border-color:rgba(26,58,92,.25);transform:translateY(-2px);box-shadow:0 16px 40px rgba(15,23,42,.06)}
.yb-card h3{font-size:17px;font-weight:700;color:#1a2238;margin:0 0 10px;line-height:1.4;letter-spacing:.3px}
.yb-card h3 a{color:inherit;text-decoration:none;transition:color .25s}
.yb-card h3 a:hover{color:#1a3a5c}
.yb-card p{font-size:14px;color:#475569;line-height:1.8;margin:0}

/* ========= FAQ 常见问题 ========= */
.yb-faq-list{display:flex;flex-direction:column;gap:12px;margin-top:24px}
.yb-faq{background:#fff;border:1px solid #e5e9f2;border-radius:8px;overflow:hidden;transition:border-color .25s,box-shadow .25s}
.yb-faq[open]{border-color:rgba(26,58,92,.3);box-shadow:0 8px 24px rgba(15,23,42,.05)}
.yb-faq summary{list-style:none;cursor:pointer;padding:18px 24px;font-size:15px;font-weight:600;color:#1a2238;position:relative;padding-right:36px;transition:background .2s}
.yb-faq summary::-webkit-details-marker{display:none}
.yb-faq summary::after{content:"+";position:absolute;right:24px;top:50%;transform:translateY(-50%);font-size:22px;color:#1a3a5c;font-weight:300;transition:transform .25s}
.yb-faq[open] summary::after{content:"−";transform:translateY(-50%) rotate(0deg)}
.yb-faq summary:hover{background:#f7f9fc}
.yb-faq-a{padding:0 24px 18px;font-size:14px;color:#475569;line-height:1.8}
.yb-faq-a b{color:#1a2238;font-weight:600}

@media(max-width:1199px){
  .yb-grid-3{grid-template-columns:repeat(2,1fr)}
  .yb-page-title{font-size:36px}
  .yb-flow-node{min-width:160px}
}
@media(max-width:900px){
  .yb-flow{flex-direction:column}
  .yb-flow-arrow{flex:0 0 24px;transform:rotate(90deg);font-size:20px}
  .yb-flow-node{width:100%}
}
@media(max-width:768px){
  .ptc-hero{min-height:267px;padding:40px 0 47px}
  .ptc-hero-title{font-size:26px;letter-spacing:1.5px}
  .ptc-hero-sub{font-size:14px;line-height:1.8}
  .yb-tech-section{padding:48px 0 64px}
  .yb-page-title{font-size:26px}
  .yb-lead{font-size:15px}
  .yb-figure{padding:20px;overflow-x:auto}
  .yb-fig-svg{min-width:600px}
  .yb-grid-3{grid-template-columns:1fr}
  .yb-compare-table{min-width:600px}
  .yb-compare-table th,.yb-compare-table td{padding:10px 12px;font-size:13px}
  .yb-compare-th-img{width:44px;height:44px}
  .yb-compare-th-name{font-size:13px;max-width:120px}
  .yb-faq summary{padding:14px 18px;font-size:14px}
  .yb-faq-a{padding:0 18px 14px}
}