/* ========= 技术支持 Banner ========= */
.ptc-hero{position:relative;display:flex;align-items:center;min-height:347px;padding:54px 0 67px;background:linear-gradient(120deg,#0f2540 0%,#1a3a6c 55%,#2a5a9c 100%);color:#fff;overflow:hidden}
.ptc-hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 18% 28%,rgba(232,168,56,.18) 0%,transparent 50%),radial-gradient(circle at 82% 72%,rgba(42,90,156,.35) 0%,transparent 52%);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:#ffd98a}
.ptc-crumb-sep{opacity:.4}
.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}

/* ========= 深色工程风正文区 ========= */
.ptc-wrap{--pt-bg:#0b1524;--pt-bg-2:#0f1e33;--pt-card:#13243c;--pt-card-2:#16294a;--pt-line:rgba(255,255,255,.08);--pt-line-2:rgba(255,255,255,.14);--pt-text:#dbe6f5;--pt-muted:#8ea3bf;--pt-accent:#e8a838;--pt-accent-2:#4a9eff;position:relative;background:radial-gradient(1200px 620px at 80% -8%,rgba(74,158,255,.10),transparent 60%),radial-gradient(900px 520px at 6% 8%,rgba(232,168,56,.08),transparent 55%),linear-gradient(180deg,#0b1524 0%,#0d1a2e 100%);color:var(--pt-text);padding:0 0 110px;overflow:hidden;font-family:"Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif}
.ptc-wrap::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.022) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.022) 1px,transparent 1px);background-size:46px 46px;pointer-events:none}
.pt-shell{position:relative;z-index:1}

.pt-kicker{display:inline-flex;align-items:center;gap:10px;margin:0 0 14px;font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;font-size:12px;letter-spacing:.26em;text-transform:uppercase;color:var(--pt-accent)}
.pt-kicker::before{content:"";width:26px;height:1px;background:var(--pt-accent)}

.pt-intro{padding:84px 0 0}
.pt-intro-head{margin-bottom:20px}
.pt-intro-title{margin:0;font-size:clamp(30px,4vw,50px);font-weight:800;line-height:1.2;letter-spacing:.5px;color:#fff}
.pt-intro-desc{margin:22px 0 0;max-width:900px;font-size:16px;line-height:2.05;color:var(--pt-muted)}
.pt-anchor{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.pt-anchor a{display:inline-flex;align-items:center;gap:10px;padding:11px 20px;border:1px solid var(--pt-line-2);background:rgba(255,255,255,.03);color:var(--pt-text);font-size:14px;text-decoration:none;transition:border-color .25s,background .25s,transform .25s}
.pt-anchor a i{font-family:ui-monospace,Consolas,monospace;font-style:normal;font-size:12px;color:var(--pt-accent)}
.pt-anchor a:hover{border-color:var(--pt-accent);background:rgba(232,168,56,.1);transform:translateY(-2px)}

.pt-block{margin-top:96px;padding-top:40px;border-top:1px solid var(--pt-line)}
.pt-bhead{display:flex;align-items:flex-start;gap:24px}
.pt-no{flex:0 0 auto;font-family:ui-monospace,Consolas,monospace;font-size:48px;font-weight:700;line-height:1;color:transparent;-webkit-text-stroke:1px rgba(74,158,255,.55)}
.pt-block h3{margin:6px 0 0;font-size:clamp(23px,2.8vw,34px);font-weight:800;letter-spacing:.5px;color:#fff}
.pt-lead{margin:20px 0 0;max-width:920px;font-size:15.5px;line-height:2.05;color:var(--pt-muted)}

.pt-steps{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:34px}
.pt-step{position:relative;padding:26px 26px 26px 30px;background:linear-gradient(160deg,var(--pt-card) 0%,var(--pt-card-2) 100%);border:1px solid var(--pt-line);overflow:hidden;transition:border-color .3s,transform .3s}
.pt-step::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:linear-gradient(180deg,var(--pt-accent),transparent)}
.pt-step:hover{border-color:rgba(232,168,56,.4);transform:translateY(-3px)}
.pt-step-head{display:flex;align-items:baseline;gap:14px;margin-bottom:12px}
.pt-step-no{font-family:ui-monospace,Consolas,monospace;font-size:12px;letter-spacing:.12em;color:var(--pt-accent);flex:0 0 auto}
.pt-step h4{margin:0;font-size:17px;font-weight:700;letter-spacing:.3px;color:#fff}
.pt-step p{margin:0;font-size:14.5px;line-height:1.95;color:var(--pt-muted)}

.pt-chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.pt-chips span{padding:9px 16px;border:1px solid var(--pt-line-2);background:rgba(255,255,255,.03);font-size:13.5px;color:var(--pt-text)}

.pt-faq{margin-top:28px;border-top:1px solid var(--pt-line)}
.pt-faq-item{border-bottom:1px solid var(--pt-line)}
.pt-faq-item summary{position:relative;list-style:none;cursor:pointer;padding:22px 46px 22px 0;font-size:15.5px;font-weight:600;line-height:1.7;color:#fff;transition:color .25s}
.pt-faq-item summary::-webkit-details-marker{display:none}
.pt-faq-item summary::after{content:"";position:absolute;right:12px;top:26px;width:11px;height:11px;border-right:1.5px solid var(--pt-accent);border-bottom:1.5px solid var(--pt-accent);transform:rotate(45deg);transition:transform .25s}
.pt-faq-item[open] summary::after{transform:rotate(-135deg);top:30px}
.pt-faq-item summary:hover{color:var(--pt-accent)}
.pt-faq-a{padding:0 46px 24px 0;font-size:14.5px;line-height:2;color:var(--pt-muted)}

.pt-table-scroll{overflow-x:auto;margin-top:30px;border:1px solid var(--pt-line-2);background:rgba(255,255,255,.02);-webkit-overflow-scrolling:touch}
.pt-table{width:100%;min-width:820px;border-collapse:collapse;font-size:14px}
.pt-table th,.pt-table td{padding:16px 20px;text-align:left;vertical-align:top;line-height:1.85;border-bottom:1px solid var(--pt-line)}
.pt-table thead th{background:rgba(74,158,255,.12);color:#cfe4ff;font-size:12.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;white-space:nowrap;border-bottom:1px solid rgba(74,158,255,.3)}
.pt-table tbody tr:hover{background:rgba(232,168,56,.06)}
.pt-table tbody tr:last-child td{border-bottom:none}
.pt-table .pt-td-sym{width:220px;color:#fff;font-weight:600}
.pt-table td{color:var(--pt-muted)}

.pt-note{margin:22px 0 0;font-size:13px;line-height:1.9;color:#6f83a0}
.pt-note a{color:var(--pt-accent-2);text-decoration:none;border-bottom:1px solid rgba(74,158,255,.35)}
.pt-note a:hover{color:#7fbaff}
.pt-warn{color:var(--pt-accent)}

.pt-cta{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:26px;margin-top:100px;padding:46px 42px;border:1px solid var(--pt-line-2);background:linear-gradient(135deg,rgba(74,158,255,.1) 0%,rgba(232,168,56,.08) 100%)}
.pt-cta h3{margin:0 0 10px;font-size:clamp(21px,2.6vw,30px);font-weight:800;letter-spacing:.4px;color:#fff}
.pt-cta p{margin:0;max-width:700px;font-size:15px;line-height:1.95;color:var(--pt-muted)}
.pt-cta-btns{display:flex;flex-wrap:wrap;gap:14px}
.pt-btn{display:inline-flex;align-items:center;gap:8px;padding:14px 30px;border:1px solid transparent;font-size:15px;font-weight:600;text-decoration:none;transition:background .25s,color .25s,border-color .25s,transform .25s}
.pt-btn-primary{background:linear-gradient(135deg,#e8a838,#e07a2a);color:#1a1206}
.pt-btn-primary:hover{box-shadow:0 12px 28px rgba(232,168,56,.4);transform:translateY(-2px);color:#1a1206}
.pt-btn-ghost{border-color:rgba(255,255,255,.3);color:#fff}
.pt-btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08);color:#fff}

@media(max-width:1199px){
  .pt-intro{padding-top:64px}
  .pt-block{margin-top:76px}
}
@media(max-width:900px){
  .pt-steps{grid-template-columns:1fr}
}
@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}
  .ptc-wrap{padding-bottom:68px}
  .pt-intro{padding-top:48px}
  .pt-intro-desc{font-size:15px;line-height:1.95}
  .pt-anchor{gap:8px}
  .pt-anchor a{padding:9px 14px;font-size:13px}
  .pt-block{margin-top:56px;padding-top:26px}
  .pt-bhead{gap:14px}
  .pt-no{font-size:34px}
  .pt-lead{font-size:14.5px;line-height:1.95}
  .pt-step{padding:20px 18px 20px 22px}
  .pt-step h4{font-size:15.5px}
  .pt-step p{font-size:14px;line-height:1.9}
  .pt-chips{gap:8px;margin-top:20px}
  .pt-chips span{padding:7px 13px;font-size:12.5px}
  .pt-faq-item summary{padding:16px 38px 16px 0;font-size:14.5px}
  .pt-faq-item summary::after{right:8px;top:20px}
  .pt-faq-item[open] summary::after{top:24px}
  .pt-faq-a{padding:0 38px 18px 0;font-size:14px}
  .pt-table{min-width:680px}
  .pt-table th,.pt-table td{padding:12px 14px;font-size:13px}
  .pt-table .pt-td-sym{width:150px}
  .pt-cta{margin-top:64px;padding:28px 22px}
  .pt-cta p{font-size:14px}
  .pt-cta-btns{width:100%}
  .pt-btn{flex:1 1 auto;justify-content:center;padding:13px 20px;font-size:14px}
}