/* 研究详情页 */
:root{
  --blue:#2563eb; --violet:#7c3aed;
  --ink:#0f172a; --ink-2:#475569; --ink-3:#94a3b8;
  --bg:#f8fafc; --card:#ffffff; --line:#e2e8f0;
  --grad:linear-gradient(135deg,#2563eb 0%,#7c3aed 100%);
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.75;-webkit-font-smoothing:antialiased}
nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);border-bottom:1px solid rgba(226,232,240,.7)}
.nav-in{max-width:1080px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;color:var(--ink)}
.logo-mark{width:30px;height:30px;border-radius:9px;background:var(--grad);display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:800}
.nav-links{display:flex;gap:24px;font-size:14.5px;color:var(--ink-2)}
.nav-links a:hover{color:var(--blue)}
.page-hero{padding:120px 24px 56px;background:radial-gradient(900px 400px at 85% -20%,rgba(124,58,237,.25),transparent 60%),linear-gradient(160deg,#0b1220 0%,#141e3f 60%,#1e1b4b 100%);color:#e2e8f0;position:relative;overflow:hidden}
.page-hero .badge{display:inline-block;font-size:12px;font-weight:700;padding:4px 14px;border-radius:999px;background:rgba(167,139,250,.18);color:#c4b5fd;border:1px solid rgba(167,139,250,.4);margin-bottom:14px;letter-spacing:1px}
.page-hero h1{font-size:clamp(28px,4.2vw,42px);font-weight:800;color:#fff;letter-spacing:-.3px;line-height:1.2}
.page-hero .desc{margin-top:14px;font-size:15.5px;color:#cbd5e1;max-width:680px}
.page-hero .meta{margin-top:20px;display:flex;flex-wrap:wrap;gap:18px;font-size:13px;color:#94a3b8}
.page-hero .meta span{background:rgba(255,255,255,.05);padding:5px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.1)}
.content{max-width:1080px;margin:0 auto;padding:48px 24px;display:grid;grid-template-columns:1fr 280px;gap:36px;align-items:start}
.markdown{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:32px;line-height:1.8;font-size:15.5px;color:var(--ink-2)}
.markdown h2{color:var(--ink);font-size:20px;margin:28px 0 14px;font-weight:700;border-left:3px solid var(--violet);padding-left:12px}
.markdown h3{color:var(--ink);font-size:17px;margin:22px 0 10px;font-weight:700}
.markdown h2:first-child{margin-top:0}
.markdown p{margin-bottom:14px}
.markdown ul,.markdown ol{margin:0 0 16px 22px}
.markdown li{margin-bottom:6px}
.markdown b,.markdown strong{color:var(--ink)}
.markdown code{background:#f1f5f9;padding:1px 6px;border-radius:4px;font-size:13.5px;color:#be185d}
.markdown blockquote{border-left:3px solid var(--blue);background:#eff6ff;padding:12px 18px;border-radius:0 8px 8px 0;margin:14px 0;color:var(--ink-2)}
.markdown table{width:100%;border-collapse:collapse;margin:14px 0;font-size:14px}
.markdown th,.markdown td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.markdown th{background:#f1f5f9;color:var(--ink);font-weight:700}
.actions{position:sticky;top:84px;display:flex;flex-direction:column;gap:12px}
.actions .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:12px;font-weight:600;font-size:14.5px;border:none;cursor:pointer;text-align:center;transition:all .2s}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 6px 18px rgba(99,102,241,.25)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(99,102,241,.35)}
.btn-outline{background:var(--card);color:var(--blue);border:1px solid #c7d2fe}
.btn-outline:hover{background:#eff6ff}
.info{margin-top:18px;background:#f8fafc;border:1px dashed var(--line);border-radius:12px;padding:18px;font-size:13px;color:var(--ink-2)}
.info b{color:var(--ink);display:block;margin-bottom:6px}
footer{border-top:1px solid var(--line);padding:32px 24px;text-align:center;color:var(--ink-3);font-size:13px;background:var(--card)}
@media(max-width:820px){.content{grid-template-columns:1fr}.actions{position:static;flex-direction:row;flex-wrap:wrap}.actions .btn{flex:1}}