/* ---------- SEO/GEO 主题页 ---------- */
.topic-page{background:var(--paper);min-height:100vh}
.topic-crumb{max-width:1180px;margin:0 auto;padding:20px clamp(20px,5.5vw,96px) 0;font-size:12px;color:var(--muted-2)}
.topic-crumb a{color:var(--brand);text-decoration:none}
.topic-hero{max-width:1180px;margin:0 auto;padding:58px clamp(20px,5.5vw,96px) 84px}
.topic-hero h1{font-size:clamp(36px,5vw,68px);line-height:1.12;letter-spacing:-.055em;color:var(--navy);max-width:840px;margin:18px 0 22px}
.topic-hero h1 span{color:var(--brand)}
.topic-lead{max-width:760px;font-size:18px;line-height:1.9;color:#4a5a73;margin:0}
.topic-actions{display:flex;flex-wrap:wrap;gap:18px;align-items:center;margin-top:30px}
.topic-hero .text-link{color:var(--brand)}
.topic-hero .text-link:hover{color:var(--navy)}
.topic-facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;max-width:780px;margin-top:46px}
.topic-fact{background:#fff;border:1px solid var(--line-2);border-radius:var(--radius-sm);padding:18px 20px}
.topic-fact strong{display:block;color:var(--navy);font-size:18px;margin-bottom:6px}
.topic-fact small{display:block;color:var(--muted-2);font-size:12px;line-height:1.6}
.topic-band{background:#fff;border-top:1px solid var(--line-2);padding:80px clamp(20px,5.5vw,96px)}
.topic-band-inner{max-width:1180px;margin:0 auto}
.topic-band h2{font-size:clamp(26px,3.5vw,42px);line-height:1.25;letter-spacing:-.04em;color:var(--navy);margin:0 0 14px}
.topic-band h2 span{color:var(--brand)}
.topic-band-intro{max-width:720px;font-size:15px;line-height:1.9;color:var(--muted);margin:0 0 34px}
.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.topic-card{border:1px solid var(--line-2);border-radius:var(--radius-sm);padding:24px;background:var(--paper)}
.topic-card h3{margin:0 0 9px;font-size:18px;color:var(--navy)}
.topic-card p{margin:0;font-size:14px;line-height:1.85;color:var(--muted)}
.topic-card ul{margin:14px 0 0;padding-left:18px;color:var(--muted);font-size:13px;line-height:1.9}
.topic-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;counter-reset:topic-step}
.topic-step{counter-increment:topic-step;border-top:2px solid var(--brand);padding-top:13px}
.topic-step::before{content:"0" counter(topic-step);display:block;font:700 11px var(--font-mono);color:var(--brand);margin-bottom:12px}
.topic-step strong{display:block;color:var(--navy);font-size:14px;margin-bottom:6px}
.topic-step span{display:block;color:var(--muted);font-size:12px;line-height:1.7}
.topic-status{display:inline-flex;align-items:center;gap:8px;padding:7px 11px;border-radius:999px;background:#eef4ff;color:#2455a9;font-size:12px;font-weight:700;margin-top:8px}
.topic-status::before{content:"";width:6px;height:6px;border-radius:50%;background:#3b82f6}
.topic-cta{background:var(--navy);color:#fff;padding:72px clamp(20px,5.5vw,96px)}
.topic-cta-inner{max-width:1180px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap}
.topic-cta h2{font-size:clamp(27px,3.5vw,42px);line-height:1.25;letter-spacing:-.04em;margin:0;color:#fff}
.topic-cta h2 span{color:#9cbbec}
.topic-cta p{margin:14px 0 0;color:#b9c7de;font-size:14px;line-height:1.8}
.topic-cta .button{white-space:nowrap}
.topic-footer{background:#081a42;color:#93a7cc;padding:28px clamp(20px,5.5vw,96px);font-size:12px}
.topic-footer-inner{max-width:1180px;margin:0 auto;display:flex;gap:18px;justify-content:space-between;align-items:center;flex-wrap:wrap}
.topic-footer a{color:#a9bada;text-decoration:none}
@media(max-width:840px){.topic-grid{grid-template-columns:1fr 1fr}.topic-steps{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:28px}}
@media(max-width:640px){.topic-hero{padding-top:40px;padding-bottom:62px}.topic-hero h1{font-size:32px}.topic-lead{font-size:16px}.topic-facts{grid-template-columns:1fr}.topic-band{padding-top:62px;padding-bottom:62px}.topic-grid{grid-template-columns:1fr}.topic-steps{grid-template-columns:1fr}.topic-cta{padding-top:58px;padding-bottom:58px}}