:root{--brand: #2563eb;--brand-dark: #1d4ed8;--brand-soft: #eff6ff;--ink: #0f172a;--ink-2: #475569;--ink-3: #94a3b8;--line: #e2e8f0;--bg: #f8fafc;--radius: 14px}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Segoe UI,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.app{min-height:100vh;display:flex;flex-direction:column}.nav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.nav-inner{max-width:1120px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px}.brand-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),#0ea5e9);color:#fff;display:grid;place-items:center;font-weight:700;font-size:17px}.brand-text{font-size:19px;font-weight:700;letter-spacing:.5px}.nav-links{display:flex;gap:26px;font-size:15px;color:var(--ink-2)}.nav-links a:hover{color:var(--brand)}.nav-links a.active{color:var(--brand);font-weight:600}.main{flex:1}.wrap{max-width:1120px;margin:0 auto;padding:32px 20px}.hero{background:linear-gradient(135deg,#1e3a8a 0%,var(--brand) 55%,#0ea5e9 100%);color:#fff;padding:64px 20px 72px;text-align:center}.hero h1{font-size:38px;margin:0 0 14px;font-weight:800;letter-spacing:1px}.hero p{font-size:17px;margin:0 auto 28px;max-width:620px;opacity:.93;line-height:1.7}.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}.btn{display:inline-block;padding:12px 26px;border-radius:10px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:all .18s}.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-dark)}.btn-ghost{background:#ffffff24;color:#fff;border-color:#ffffff80}.btn-ghost:hover{background:#ffffff3d}.btn-outline{background:#fff;color:var(--brand);border-color:var(--brand)}.btn-outline:hover{background:var(--brand-soft)}.btn:disabled{opacity:.55;cursor:not-allowed}.section-title{font-size:22px;font-weight:700;margin:0 0 6px}.section-sub{color:var(--ink-2);font-size:14px;margin:0 0 22px}.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;transition:box-shadow .18s,transform .18s}.card:hover{box-shadow:0 8px 24px #0f172a17;transform:translateY(-2px)}.card-title{font-size:16px;font-weight:700;margin-bottom:6px}.card-desc{font-size:13px;color:var(--ink-2);line-height:1.65}.expert-card{display:flex;flex-direction:column;gap:12px}.expert-head{display:flex;gap:12px;align-items:center}.avatar{width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,#dbeafe,#bfdbfe);color:var(--brand-dark);display:grid;place-items:center;font-weight:700;font-size:19px;flex-shrink:0}.expert-name{font-size:16px;font-weight:700;display:flex;align-items:center;gap:6px}.honor{font-size:11px;background:var(--brand-soft);color:var(--brand-dark);padding:2px 7px;border-radius:5px;font-weight:600}.expert-title{font-size:13px;color:var(--ink-2);margin-top:3px;line-height:1.5}.expert-intro{font-size:13px;color:var(--ink-2);line-height:1.65;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.expert-meta{font-size:12px;color:var(--ink-3);display:flex;gap:14px}.tags{display:flex;flex-wrap:wrap;gap:7px}.tag{font-size:12px;background:#f1f5f9;color:var(--ink-2);padding:3px 9px;border-radius:6px}.detail{display:grid;grid-template-columns:1fr 330px;gap:26px;align-items:start}@media (max-width: 860px){.detail{grid-template-columns:1fr}}.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}.panel h3{margin:0 0 14px;font-size:16px}.price-row{display:flex;justify-content:space-between;align-items:center;padding:11px 0;border-bottom:1px dashed var(--line)}.price-row:last-of-type{border-bottom:none}.price-name{font-size:14px}.price-val{font-size:17px;font-weight:700;color:var(--brand)}.buy{width:100%;margin-top:16px}.loading,.empty{text-align:center;padding:60px 20px;color:var(--ink-3);font-size:15px}.error-box{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;padding:12px 16px;border-radius:10px;font-size:14px;margin-bottom:18px}.ok-box{background:#f0fdf4;border:1px solid #bbf7d0;color:#15803d;padding:12px 16px;border-radius:10px;font-size:14px;margin-bottom:18px}.field{margin-bottom:14px}.field label{display:block;font-size:13px;color:var(--ink-2);margin-bottom:6px}.field textarea,.field input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:9px;font-size:14px;font-family:inherit;resize:vertical}.field textarea:focus,.field input:focus{outline:none;border-color:var(--brand)}.footer{background:#0f172a;color:#cbd5e1;padding:26px 20px;margin-top:40px}.footer-inner{max-width:1120px;margin:0 auto;text-align:center}.footer-sub{font-size:13px;color:#64748b;margin-top:6px}