:root{
  --blue:#1659f5; --blue-2:#3776ff; --navy:#071d63; --teal:#09c7a4;
  --ink:#13213b; --muted:#6e7890; --line:#e8edf6; --paper:#fff;
  --soft:#f6f9ff; --mint:#effcf8; --shadow:0 16px 50px rgba(18,53,112,.09);
  --radius:24px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:radial-gradient(circle at 10% 0%,rgba(22,89,245,.055),transparent 30%),radial-gradient(circle at 100% 25%,rgba(9,199,164,.055),transparent 28%),#fbfdff;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}.shell{min-height:100vh}.site-head{position:sticky;top:0;z-index:20;padding:12px 16px 10px;background:rgba(251,253,255,.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(232,237,246,.82)}
.head-inner{max-width:920px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;align-items:center;gap:10px;min-width:0}.brand img{width:88px;height:auto;display:block}.brand-text{min-width:0}.brand-eyebrow{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--teal);font-weight:850}.brand-title{font-size:14px;font-weight:900;color:var(--navy);white-space:nowrap}.head-action{font-size:12px;color:var(--navy);font-weight:800;background:#eef3ff;border:1px solid #dfe8ff;padding:8px 10px;border-radius:999px}
main{max-width:920px;margin:0 auto;padding:34px 16px 40px}.hero{padding:18px 0 24px}.hero-kicker{font-size:12px;color:var(--teal);font-weight:900;letter-spacing:.1em;text-transform:uppercase;margin-bottom:10px}.hero h1{font-size:clamp(38px,8vw,68px);line-height:1.03;letter-spacing:-.055em;color:var(--navy);margin:0 0 14px}.hero p{font-size:15px;line-height:1.75;color:var(--muted);max-width:660px;margin:0}.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.btn{border:1px solid var(--line);background:#fff;color:var(--navy);border-radius:14px;padding:11px 14px;font-weight:850;font-size:13px;display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;cursor:pointer}.btn.primary{border-color:transparent;background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;box-shadow:0 10px 24px rgba(22,89,245,.18)}.btn.teal{border-color:transparent;background:linear-gradient(135deg,var(--teal),#13b697);color:#fff}.btn.ghost{background:#f7f9fd}.btn:disabled{opacity:.45;cursor:not-allowed}
.section{margin-top:22px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:14px}.section-head h2{margin:0;color:var(--navy);font-size:21px}.section-sub{font-size:13px;color:var(--muted);margin-top:5px}.part-grid,.topic-grid{display:grid;gap:12px}.part-card,.topic-card{display:block;background:rgba(255,255,255,.97);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:18px;transition:.2s}.part-card h3{font-size:20px;color:var(--navy);margin:0 0 7px}.part-card p{color:var(--muted);font-size:14px;line-height:1.6;margin:0}.part-link{margin-top:16px;font-size:12px;font-weight:900;color:#087966}.topic-card{display:flex;align-items:flex-start;gap:13px}.topic-index{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;flex:none;background:#edf3ff;color:var(--blue);font-weight:950;font-size:12px}.topic-copy{flex:1;min-width:0}.topic-title{font-size:16px;font-weight:950;color:var(--navy);margin-bottom:4px}.topic-en{font-size:14px;line-height:1.45}.topic-meta{font-size:12px;color:var(--muted);line-height:1.5;margin-top:6px}.topic-side{font-size:11px;font-weight:900;color:#087966;background:var(--mint);border-radius:999px;padding:7px 9px;white-space:nowrap;align-self:center}.notice{padding:14px 16px;border:1px solid #dce7fb;border-radius:18px;background:#f7faff;color:#30466f;font-size:13px;line-height:1.65}.mini-footer{text-align:center;padding:26px 16px 36px;color:#8b95a8;font-size:12px}
@media(min-width:760px){.part-grid{grid-template-columns:repeat(2,1fr)}.topic-grid{grid-template-columns:repeat(2,1fr)}}