:root{--ink:#172033;--muted:#667085;--line:#e5e7eb;--panel:#f7f8fa;--accent:#2257a5;--soft:#f5f8ff}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans SC","Microsoft YaHei",sans-serif;background:#fff;line-height:1.85}
main{max-width:920px;margin:0 auto;padding:64px 28px 90px}
.hero{padding:28px 0 38px;border-bottom:1px solid var(--line);margin-bottom:34px}
.eyebrow{font-size:13px;letter-spacing:.06em;color:var(--muted)}
h1{font-size:42px;line-height:1.24;margin:12px 0 10px;letter-spacing:-.02em}
.subtitle{font-size:21px;color:#344054;margin:0}
.meta{margin-top:16px;color:var(--muted);font-size:14px}
h2{font-size:28px;line-height:1.35;margin:50px 0 18px}
h3{font-size:20px;line-height:1.45;margin:30px 0 12px}
p{font-size:17px;margin:0 0 16px}
.chain{font-weight:700;padding:11px 18px;border-left:3px solid #9ab0d3;background:#fafcff}
.continuation{margin-top:58px;padding-top:34px;border-top:1px solid var(--line)}
.card{display:block;text-decoration:none;color:inherit;border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin:14px 0;background:#fff}
.card:hover{border-color:#b8c5db;box-shadow:0 4px 18px rgba(23,32,51,.06)}
.card .q{font-size:14px;color:var(--muted);margin-bottom:5px}
.card .t{font-size:18px;font-weight:700}
.card .note{font-size:12px;color:var(--muted);margin-top:5px}
.next{margin-top:24px;background:var(--soft);border:1px solid #dce6f7;border-radius:14px;padding:22px}
.next p{margin:8px 0 10px}
.next a{display:inline-block;color:var(--accent);font-weight:700;text-decoration:none;margin-right:18px;margin-top:5px}
.boundary{font-size:14px;color:var(--muted);margin-top:30px}
@media(max-width:640px){main{padding:36px 20px 60px}h1{font-size:32px}.subtitle{font-size:18px}h2{font-size:24px}p{font-size:16px}}