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.2s}.ios-card:hover{box-shadow:var(--card-shadow-hover)}.ios-card:active{transform:scale(.98)}.stats-grid{grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:16px;display:grid}@media (max-width:480px){.stats-grid{grid-template-columns:repeat(2,1fr)}}.stats-card{text-align:center;background:var(--card-bg);border-radius:var(--radius-lg);border:.5px solid var(--gb);box-shadow:var(--card-shadow);padding:16px 8px;transition:transform .2s,box-shadow .2s}.stats-card:hover{box-shadow:var(--card-shadow-hover);transform:translateY(-2px)}.stats-card .stats-card-icon{margin-bottom:6px;font-size:22px}.stats-card .stats-card-value{letter-spacing:-.5px;font-size:20px;font-weight:700}.stats-card .stats-card-label{color:var(--t2);font-size:11px;font-weight:500}.empty-state{text-align:center;color:var(--t3);padding:48px 20px}.empty-state .empty-icon{margin-bottom:12px;font-size:48px}.empty-state p{font-size:14px}.loading-state{color:var(--t2);flex-direction:column;align-items:center;gap:12px;padding:48px 20px;display:flex}.loading-spinner{border:3px solid var(--sep);border-top-color:var(--blue);border-radius:50%;width:32px;height:32px;animation:.8s linear infinite spin}.loading-state p{font-size:14px}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--t3);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--t2)}.elevate{transition:transform .2s,box-shadow .2s}.elevate:hover{box-shadow:var(--card-shadow-hover);transform:translateY(-2px)}:root{--color-primary:#6366f1;--color-primary-light:#8b5cf6;--color-primary-dark:#4f46e5;--color-primary-bg:#6366f11a;--color-success:#22c55e;--color-success-bg:#22c55e1a;--color-warning:#f59e0b;--color-warning-bg:#f59e0b1a;--color-danger:#ef4444;--color-danger-bg:#ef44441a;--color-info:#3b82f6;--color-info-bg:#3b82f61a;--color-text-primary:#1d1d1f;--color-text-secondary:#86868b;--color-text-tertiary:#aeaeb2;--color-text-inverse:#fff;--color-bg:#f2f2f7;--color-bg-card:#fffc;--color-bg-elevated:#fffffff2;--color-bg-overlay:#0006;--color-border:#3c3c4314;--color-separator:#3c3c431f;--color-tag-bg:#78788014;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--radius-2xl:24px;--radius-full:9999px;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-8:32px;--space-10:40px;--space-12:48px;--font-sans:-apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Noto Sans SC", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono:"SF Mono", "JetBrains Mono", "Fira Code", monospace;--text-xs:12px;--text-sm:14px;--text-base:16px;--text-lg:18px;--text-xl:20px;--text-2xl:24px;--text-3xl:32px;--shadow-sm:0 1px 3px #0000000f;--shadow-md:0 2px 12px #00000014;--shadow-lg:0 4px 24px #0000001f;--shadow-glow:0 0 20px #6366f14d;--blur:40px;--glass-bg:#ffffffbf;--glass-border:#ffffff4d;--transition-fast:.15s ease;--transition-normal:.25s ease;--transition-slow:.4s ease;--max-width:960px;--max-width-wide:1200px;--header-height:56px;--tab-bar-height:64px}.dark-mode{--color-text-primary:#f5f5f7;--color-text-secondary:#a1a1a6;--color-text-tertiary:#6e6e73;--color-bg:#000;--color-bg-card:#1c1c1ed9;--color-bg-elevated:#1c1c1ef2;--color-bg-overlay:#0009;--color-border:#ffffff14;--color-separator:#ffffff1f;--color-tag-bg:#78788029;--glass-bg:#1c1c1ed9;--glass-border:#ffffff14;--shadow-sm:0 1px 3px #0000004d;--shadow-md:0 2px 12px #0006;--shadow-lg:0 4px 24px #00000080}:root{--blue:var(--color-primary);--blue-hover:var(--color-primary-light);--blue-active:var(--color-primary-dark);--green:var(--color-success);--red:var(--color-danger);--orange:var(--color-warning);--purple:var(--color-primary-light);--t1:var(--color-text-primary);--t2:var(--color-text-secondary);--t3:var(--color-text-tertiary);--bg:var(--color-bg);--ios-bg:var(--color-bg);--card-bg:var(--color-bg-card);--ios-card-bg:var(--color-bg-card);--sep:var(--color-separator);--tag:var(--color-tag-bg);--blur:40px;--card-shadow:var(--shadow-md);--card-shadow-hover:var(--shadow-lg);--glass-shadow:var(--shadow-glow);--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--radius-2xl:24px}.skeleton{background:linear-gradient(90deg, var(--opt) 25%, var(--tag) 50%, var(--opt) 75%);border-radius:var(--radius-sm);background-size:200% 100%;animation:1.5s ease-in-out infinite shimmer}.skeleton-line{background:linear-gradient(90deg, var(--opt) 25%, var(--tag) 50%, var(--opt) 75%);background-size:200% 100%;border-radius:4px;width:100%;height:14px;margin-bottom:10px;animation:1.5s ease-in-out infinite shimmer}.skeleton-line:last-child{width:60%}.stagger-enter{opacity:0;transform:translateY(12px)}.stagger-enter-active{transition:opacity .3s ease-out,transform .3s ease-out}.stagger-enter-to{opacity:1;transform:translateY(0)}@keyframes pulse-green{0%{box-shadow:0 0 #34c75966}70%{box-shadow:0 0 0 12px #34c75900}to{box-shadow:0 0 #34c75900}}@keyframes shake-red{0%,to{transform:translate(0)}20%{transform:translate(-6px)}40%{transform:translate(6px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}.answer-correct{animation:.6s pulse-green;border-color:var(--green)!important;background:var(--green-bg)!important}.answer-wrong{animation:.4s shake-red;border-color:var(--red)!important;background:var(--red-bg)!important}@keyframes heart-pop{0%{transform:scale(1)}25%{transform:scale(1.35)}50%{transform:scale(.85)}75%{transform:scale(1.1)}to{transform:scale(1)}}@keyframes heart-glow{0%{filter:drop-shadow(0 0 #ef444400)}50%{filter:drop-shadow(0 0 8px #ef444480)}to{filter:drop-shadow(0 0 #ef444400)}}.fav-heart{cursor:pointer;-webkit-user-select:none;user-select:none;justify-content:center;align-items:center;transition:color .2s;display:inline-flex}.fav-heart--active{color:#ef4444;animation:.5s heart-pop,.6s heart-glow}.fav-heart--idle{color:var(--t3)}.fav-heart--idle:hover{color:var(--t1);transform:scale(1.1)}.fav-toggle{display:none}