:root{--bg-base:#f6f6f8;--bg-white:#fff;--bg-card:#fff;--bg-surface:#f1f5f9;--bg-muted:#e2e8f0;--bg-section:#eff6ff;--gradient:linear-gradient(135deg,#2463eb,#3b82f6);--gradient-bg:linear-gradient(180deg,#f6f6f8,#f1f5f9);--primary:#2463eb;--primary-dark:#1d4ed8;--primary-bg:#eff6ff;--primary-border:#bfdbfe;--text-primary:#0f172a;--text-secondary:#334155;--text-muted:#64748b;--border:#e2e8f0;--border-light:#f1f5f9;--shadow-card:0 1px 3px rgba(0,0,0,0.06),0 4px 12px rgba(0,0,0,0.04);--shadow-hover:0 10px 25px rgba(36,99,235,0.1),0 4px 10px rgba(36,99,235,0.08);--radius:12px;--radius-lg:20px;--nav-height:64px;--ease:cubic-bezier(0.4,0,0.2,1);--transition:all 0.2s cubic-bezier(0.4,0,0.2,1)}.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px;padding:0;list-style:none;margin:0}.topic-card{background:#fff;border:1px solid #f1f5f9;border-radius:20px;padding:20px;cursor:pointer;display:flex;flex-direction:column;transition:transform .25s,box-shadow .25s,border-color .25s}.topic-card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(36,99,235,.1),0 4px 10px rgba(0,0,0,.06);border-color:#bfdbfe}.topic-card:hover .tc-title{color:#2463eb}.topic-card .tc-header{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:16px}.topic-card .tc-icon-box{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.topic-card .tc-icon-box i{font-size:22px}.topic-card .tc-icon-box.type-ordinary{background:#eff6ff}.topic-card .tc-icon-box.type-ordinary i{color:#2463eb}.topic-card .tc-icon-box.type-timing{background:#fff7ed}.topic-card .tc-icon-box.type-timing i{color:#f97316}.topic-card .tc-icon-box.type-practice{background:#faf5ff}.topic-card .tc-icon-box.type-practice i{color:#9333ea}.topic-card .tc-icon-box.type-meal{background:#fffbeb}.topic-card .tc-icon-box.type-meal i{color:#d97706}.topic-card .tc-badges{display:flex;flex-direction:column;align-items:flex-end;gap:4px}.topic-card .tc-badge{font-size:10px;font-weight:700;padding:2px 8px;border-radius:8px}.topic-card .tc-badge.badge-ordinary{background:#dbeafe;color:#1d4ed8}.topic-card .tc-badge.badge-timing{background:#ffedd5;color:#c2410c}.topic-card .tc-badge.badge-practice{background:#f3e8ff;color:#7e22ce}.topic-card .tc-badge.badge-meal{background:#fef3c7;color:#b45309}.topic-card .tc-title{font-size:15px;font-weight:700;color:#0f172a;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:45px;margin:0 0 16px;transition:color .2s}.topic-card .tc-meta{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:16px;flex:1}.topic-card .tc-meta-item{display:flex;align-items:center;gap:5px;font-size:12px;color:#94a3b8}.topic-card .tc-meta-item i{font-size:13px;flex-shrink:0}.topic-card .tc-price{display:flex;align-items:baseline;gap:6px;margin-bottom:14px}.topic-card .tc-price .price-num{font-size:18px;font-weight:900;color:#2463eb}.topic-card .tc-price .price-free{font-size:16px;font-weight:700;color:#10b981}.topic-card .tc-price .price-old{font-size:12px;color:#94a3b8;text-decoration:line-through}.topic-card .tc-btn{width:100%;padding:10px;border-radius:12px;border:none;cursor:pointer;font-size:13px;font-weight:700;transition:all .2s;margin-top:auto}.topic-card .tc-btn.tc-btn-primary{background:#2463eb;color:#fff;box-shadow:0 4px 12px rgba(36,99,235,.2)}.topic-card .tc-btn.tc-btn-primary:hover{background:#1d4ed8}.topic-card .tc-btn.tc-btn-disabled{background:#f1f5f9;color:#94a3b8;cursor:not-allowed}