*,*::before,*::after{box-sizing:border-box}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei",sans-serif;color:#1a1a1a;background:#fff;line-height:1.78}
img{display:block;max-width:100%;height:auto}
a{color:#1d4ed8;text-decoration:none}
a:hover{text-decoration:underline}
.w{width:min(960px,calc(100% - 32px));margin:0 auto}

.bar{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid #e5e5e5}
.bar-in{display:flex;align-items:center;justify-content:space-between;min-height:62px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:16px;color:#111}
.logo img{width:38px;border-radius:10px}
.logo small{display:block;font-size:10px;font-weight:600;color:#888;letter-spacing:.06em}
.nav{display:flex;gap:16px;align-items:center}
.nav a{color:#555;font-size:14px}
.ham{display:none;border:1px solid #ddd;background:#fff;border-radius:8px;padding:8px 12px;cursor:pointer}
.mnav{display:none;flex-direction:column;padding:12px 16px 18px;border-top:1px solid #eee;background:#fff}
.mnav.on{display:flex}
.mnav a{padding:10px 0;border-bottom:1px solid #f4f4f4;color:#444;font-size:14px}

.hero{padding:48px 0 24px;text-align:center}
.hero h1{font-size:clamp(26px,4vw,36px);line-height:1.3;margin:0 0 14px;color:#111}
.hero .lead{color:#555;font-size:16px;max-width:720px;margin:0 auto 8px}
.hero .meta{font-size:13px;color:#999;margin:8px 0 0}

.timeline{position:relative;padding:32px 0 56px}
.timeline::before{content:"";position:absolute;left:28px;top:0;bottom:0;width:3px;background:linear-gradient(180deg,#ea580c 0%,#fdba74 50%,#ffedd5 100%);border-radius:3px}
.step{position:relative;padding:0 0 48px 72px}
.step:last-child{padding-bottom:0}
.step-marker{position:absolute;left:14px;top:4px;width:32px;height:32px;border-radius:50%;background:#ea580c;color:#fff;font-weight:700;font-size:14px;display:grid;place-items:center;box-shadow:0 0 0 4px #fff,0 0 0 6px #fed7aa}
.step-card{border:1px solid #e8e8e8;border-radius:14px;padding:24px 26px;background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.03)}
.step-card h2,.step-card h3{margin:0 0 12px;font-size:20px;color:#111}
.step-card p{margin:0 0 14px;color:#444;font-size:15px}
.step-card p:last-child{margin-bottom:0}
.step-tag{display:inline-block;font-size:12px;font-weight:600;color:#c2410c;background:#fff7ed;padding:4px 10px;border-radius:20px;margin-bottom:10px;letter-spacing:.02em}
.step-img{margin:16px 0 0;border-radius:10px;overflow:hidden;border:1px solid #eee}
.step-img img{width:100%;max-height:320px;object-fit:cover}
.step-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}
.step-grid figure{margin:0;border:1px solid #eee;border-radius:10px;overflow:hidden}
.step-grid figcaption{padding:8px 10px;font-size:12px;color:#666;background:#fafafa}
.step-grid img{aspect-ratio:9/16;object-fit:cover;width:100%}

.link-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.link-chip{display:inline-block;padding:8px 14px;border:1px solid #fed7aa;border-radius:999px;font-size:13px;color:#c2410c;background:#fff7ed;font-weight:600}
.link-chip:hover{background:#ffedd5;text-decoration:none}

.section-head{padding:40px 0 8px;border-top:1px solid #f0f0f0;margin-top:16px}
.section-head h2{font-size:24px;margin:0 0 8px}
.faq details{border:1px solid #ececec;border-radius:10px;padding:14px 18px;margin-bottom:10px;background:#fafafa}
.faq summary{font-weight:600;cursor:pointer;color:#222}
.faq p{margin:10px 0 0;color:#555;font-size:14px}

.prose{padding:40px 0 56px}
.prose h1{font-size:28px;margin:0 0 16px}
.prose h2{font-size:20px;margin:28px 0 12px;color:#222}
.prose p,.prose li{color:#444;font-size:15px}
.prose ul{padding-left:20px}
.related{margin-top:36px;padding:20px;border:1px solid #e8e8e8;border-radius:12px;background:#f9fafb}
.related h3{margin:0 0 12px;font-size:16px}
.related a{display:block;padding:6px 0;color:#2563eb;font-size:14px}

.ftr{padding:36px 0;background:#fafafa;border-top:1px solid #eee;font-size:13px;color:#888}
.ftr a{color:#666;margin-right:14px}
.err{min-height:60vh;display:grid;place-items:center;text-align:center;padding:40px 16px}
.err h1{font-size:48px;margin:0 0 12px;color:#ccc}

@media(max-width:720px){
  .timeline::before{left:18px}
  .step{padding-left:52px}
  .step-marker{left:4px;width:28px;height:28px;font-size:12px}
  .step-grid{grid-template-columns:1fr}
  .ham{display:inline-flex}
  .nav{display:none}
}