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.2s}.course-link.douban{color:#00b51d;border-color:#00b51d66}.course-link.douban:hover{background:#00b51d;color:#fff}.course-link.jd{color:#e1251b;border-color:#e1251b73}.course-link.jd:hover{background:#e1251b;color:#fff}.course-link.tencent{color:#1478f0;border-color:#1478f073}.course-link.tencent:hover{background:#1478f0;color:#fff}.course-link.coursera{color:#0056d2;border-color:#0056d273}.course-link.coursera:hover{background:#0056d2;color:#fff}.course-link.dedao{color:#ff5000;border-color:#ff500073}.course-link.dedao:hover{background:#ff5000;color:#fff}.course-link.mooc{color:#c7000b;border-color:#c7000b73}.course-link.mooc:hover{background:#c7000b;color:#fff}.course-link.khan{color:#14bf96;border-color:#14bf9673}.course-link.khan:hover{background:#14bf96;color:#fff}.course-meta{font-size:11.5px;color:var(--muted)}.course-card p{margin:8px 0 0;font-size:12px;color:#495057;line-height:1.7;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.course-footer-note{text-align:center;font-size:11.5px;color:var(--muted);padding:6px 0 14px}.bio-card{display:flex;gap:18px;margin:0 auto 16px;background:#94a3b812;border:1px solid rgba(148,163,184,.2);border-radius:16px;padding:20px 22px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);animation:about-fade-up .7s both}.bio-avatar{flex-shrink:0;width:56px;height:56px;display:flex;align-items:center;justify-content:center;font-size:28px;background:linear-gradient(135deg,#7c3aed4d,#2563eb4d);border:1px solid rgba(167,139,250,.4);border-radius:16px}.bio-body{min-width:0;flex:1}.bio-text{margin:0 0 14px;font-size:13.5px;line-height:1.9;color:#cbd5e1}.bio-text b{color:#a78bfa;font-weight:700}.bio-row{display:flex;align-items:flex-start;gap:10px;margin-top:8px}.bio-row-label{flex-shrink:0;font-size:12px;color:#94a3b8;padding-top:3px;white-space:nowrap}.bio-tags{display:flex;flex-wrap:wrap;gap:6px}.bio-tag{font-size:12px;color:#e2e8f0;background:#a78bfa1f;border:1px solid rgba(167,139,250,.35);border-radius:999px;padding:2px 12px;white-space:nowrap;transition:all .2s}.bio-tag:hover{background:#a78bfa47;border-color:#a78bfa99}@media (max-width: 560px){.bio-card{flex-direction:column;gap:12px}.bio-avatar{width:48px;height:48px;font-size:24px}}.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(280px,100%),1fr));gap:14px;margin:0 auto}.contact-card{display:flex;align-items:center;gap:14px;background:#94a3b812;border:1px solid rgba(148,163,184,.2);border-radius:16px;padding:18px 20px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all .3s;animation:about-fade-up .7s both;text-decoration:none;color:inherit}.contact-card:hover{transform:translateY(-3px);border-color:#a78bfa8c;box-shadow:0 10px 32px #7c3aed38}.contact-icon{font-size:28px;width:52px;height:52px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#7c3aed4d,#2563eb4d);border:1px solid rgba(167,139,250,.4);border-radius:14px}.contact-body{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1}.contact-label{font-size:11px;letter-spacing:2px;color:#94a3b8}.contact-value{font-size:16px;font-weight:700;color:#f1f5f9;word-break:break-all}.contact-btn{flex-shrink:0;font-size:12px;font-weight:600;color:#a78bfa;border:1px solid rgba(167,139,250,.45);background:transparent;border-radius:999px;padding:5px 14px;cursor:pointer;transition:all .2s}.contact-btn:hover{background:#7c3aed;border-color:#7c3aed;color:#fff}.contact-wechat{cursor:pointer}.qr-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:300;background:#050812c7;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;padding:20px;animation:about-fade-up .25s both}.qr-modal{background:#fff;border-radius:18px;padding:22px 24px;width:340px;max-width:100%;text-align:center;box-shadow:0 24px 64px #00000080}.qr-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;text-align:left}.qr-head h3{margin:0 0 2px;font-size:17px;color:#1f2430}.qr-sub{font-size:12px;color:#8a92a6}.qr-close{border:1px solid #e6e9f0;background:#f8fafc;color:#495057;border-radius:50%;width:30px;height:30px;font-size:13px;cursor:pointer;transition:all .15s}.qr-close:hover{background:#eef1f6}.qr-img{width:240px;height:240px;object-fit:contain;border:1px solid #f1f3f8;border-radius:10px}.qr-fallback{display:none;flex-direction:column;gap:6px;width:240px;height:240px;margin:0 auto;align-items:center;justify-content:center;background:#f8fafc;border:1px dashed #d0d5dd;border-radius:10px;font-size:13px;color:#495057}.qr-fallback-tip{font-size:11px;color:#8a92a6}.qr-tip{margin:14px 0 0;font-size:12px;color:#8a92a6}.admin-page{max-width:1420px;margin:0 auto;padding:24px 24px 48px}.admin-header{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:18px}.admin-header-left{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.admin-badge{font-size:10px;font-weight:800;letter-spacing:1.5px;color:#7c3aed;border:1px solid rgba(124,58,237,.4);border-radius:999px;padding:4px 12px;background:#7c3aed0f}.admin-title{margin:0;font-size:20px;font-weight:800;color:var(--text)}.admin-loading{padding:60px 0;text-align:center;color:var(--muted)}.admin-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(200px,100%),1fr));gap:14px;margin-bottom:20px}.admin-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 18px;display:flex;flex-direction:column;gap:6px}.admin-card-label{font-size:12px;color:var(--muted)}.admin-card-value{font-size:26px;font-weight:800;color:var(--primary);line-height:1.1}.admin-section{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 20px;margin-bottom:18px}.admin-section h2{margin:0 0 6px;font-size:15px;font-weight:800;color:var(--text)}.admin-section-head{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.admin-hint{margin:4px 0 12px;font-size:12px;color:var(--muted)}.admin-range{display:flex;gap:6px}.admin-range-btn{font-size:12px;padding:4px 12px;border:1px solid var(--border);border-radius:999px;background:#f8fafc;color:var(--muted);cursor:pointer;transition:all .15s}.admin-range-btn.active{border-color:var(--primary);color:var(--primary);background:#2563eb14;font-weight:700}.admin-chart{width:100%;height:260px;margin:8px 0 4px}.admin-details{margin-top:10px}.admin-details summary{cursor:pointer;font-size:12px;color:var(--primary);margin-bottom:8px;-webkit-user-select:none;user-select:none}.admin-bar-track{width:100%;min-width:120px;height:8px;background:#eef1f6;border-radius:999px;overflow:hidden}.admin-bar-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,#2563eb,#7c3aed);transition:width .3s}.admin-bar-fill.hot{background:linear-gradient(90deg,#e03131,#f08c00)}@media (max-width: 560px){.admin-page{padding:16px 14px 40px}.admin-chart{height:210px}}.auth-code-hint{margin:0 0 10px;font-size:13px;line-height:1.8;color:#495057;background:#f0f7ff;border:1px solid #dbeafe;border-radius:10px;padding:10px 14px}.auth-code-dev{margin:0 0 10px;font-size:12px;color:#b45309;background:#fffbeb;border:1px dashed #fcd34d;border-radius:10px;padding:8px 12px}.auth-code-input{text-align:center;font-size:20px!important;font-weight:700;letter-spacing:8px;font-family:ui-monospace,Menlo,monospace}.auth-code-actions{display:flex;justify-content:space-between;gap:10px;margin-top:12px}.auth-link{border:none;background:none;color:var(--primary);font-size:12.5px;cursor:pointer;padding:2px 0}.auth-link:hover:not(:disabled){text-decoration:underline}.auth-link:disabled{color:var(--muted);cursor:not-allowed}.watchlist-tip{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:12.5px;color:#1e40af;background:#eff6ff;border:1px solid #bfdbfe;border-radius:10px;padding:8px 14px;margin-bottom:12px}.watchlist-tip span{font-weight:700}.watchlist-tip .auth-link{margin-left:auto;font-weight:600}