:root{--color-primary-50:#eff6ff;--color-primary-100:#dbeafe;--color-primary-200:#bfdbfe;--color-primary-300:#93c5fd;--color-primary-400:#3b82f6;--color-primary-500:#2563eb;--color-primary-600:#1d4ed8;--color-primary-700:#1e40af;--color-primary:var(--color-primary-500);--color-primary-hover:var(--color-primary-400);--color-primary-active:var(--color-primary-600);--color-primary-light:var(--color-primary-50);--color-success:#22c55e;--color-success-light:#dcfce7;--color-success-dark:#16a34a;--color-danger:#ef4444;--color-danger-hover:#dc2626;--color-danger-light:#fee2e2;--color-warning:#f59e0b;--color-warning-light:#fef3c7;--color-gray-50:#f9fafb;--color-gray-100:#f3f4f6;--color-gray-200:#e5e7eb;--color-gray-300:#d1d5db;--color-gray-400:#9ca3af;--color-gray-500:#6b7280;--color-gray-600:#4b5563;--color-gray-700:#374151;--color-gray-800:#1f2937;--color-gray-900:#111827;--color-bg:var(--color-gray-50);--color-bg-white:#fff;--color-border:var(--color-gray-200);--color-border-focus:var(--color-primary-500);--color-text:var(--color-gray-800);--color-text-secondary:var(--color-gray-500);--color-text-muted:var(--color-gray-400);--color-text-done:var(--color-gray-300);--gradient-primary:linear-gradient(135deg, 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2px 4px #0000000a;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-base:.2s cubic-bezier(.4, 0, .2, 1);--transition-smooth:.3s cubic-bezier(.4, 0, .2, 1);--transition-spring:.4s cubic-bezier(.34, 1.56, .64, 1);--transition-bounce:.5s cubic-bezier(.68, -.55, .265, 1.55);--container-max-width:640px}@media (prefers-reduced-motion:reduce){:root{--transition-fast:0s;--transition-base:0s;--transition-smooth:0s;--transition-spring:0s;--transition-bounce:0s}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeOutDown{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(8px)}}@keyframes checkBounce{0%{transform:scale(.8)}50%{transform:scale(1.15)}to{transform:scale(1)}}@keyframes strikethrough{0%{width:0}to{width:100%}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes pulseGlow{0%,to{box-shadow:0 0 #2563eb33}50%{box-shadow:0 0 0 8px #2563eb00}}@keyframes slideInRight{0%{opacity:0;transform:translate(-12px)}to{opacity:1;transform:translate(0)}}@keyframes emptyBounce{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{font-size:var(--font-size-body);line-height:var(--line-height-base);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizelegibility}body{font-family:var(--font-family-base);color:var(--color-text);background:var(--gradient-bg);min-height:100vh}::selection{background:var(--color-primary-100);color:var(--color-primary-700)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--color-gray-300);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-gray-400)}.app-wrapper{flex-direction:column;min-height:100vh;display:flex}.app-header{background:var(--gradient-header);padding:var(--spacing-xl) var(--spacing-md) 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var(--transition-fast), padding-left var(--transition-base);animation:.25s ease-out both slideInRight;display:flex;position:relative}.todo-item:last-child{border-bottom:none}.todo-item:hover{background:var(--color-gray-50)}.todo-item:before{content:"";background:var(--gradient-primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0;width:3px;height:0;transition:height var(--transition-base);position:absolute;top:50%;left:0;transform:translateY(-50%)}.todo-item:hover:before{height:60%}.todo-checkbox{border:2px solid var(--color-gray-300);border-radius:var(--radius-full);cursor:pointer;width:22px;height:22px;transition:all var(--transition-base);flex-shrink:0;justify-content:center;align-items:center;display:flex;position:relative}.todo-checkbox:hover{border-color:var(--color-primary-400);background:var(--color-primary-50);box-shadow:0 0 0 4px #2563eb0f}.todo-checkbox:active{transform:scale(.9)}.todo-item--done 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.icon-empty{width:80px;height:80px;margin:0 auto var(--spacing-lg);color:var(--color-gray-200);animation:3s ease-in-out infinite emptyBounce}.todo-empty-text{font-size:var(--font-size-body);color:var(--color-gray-400);font-weight:var(--font-weight-medium)}.todo-empty-sub{font-size:var(--font-size-small);color:var(--color-gray-300);margin-top:var(--spacing-xs)}.app-footer{-webkit-backdrop-filter:blur(12px);border-top:1px solid var(--color-gray-200);padding:var(--spacing-md);z-index:10;background:#fffc;position:sticky;bottom:0}.footer-inner{max-width:var(--container-max-width);justify-content:space-between;align-items:center;margin:0 auto;display:flex}.filter-group{gap:var(--spacing-xs);background:var(--color-gray-100);border-radius:var(--radius-md);padding:3px;display:flex}.btn-filter{font-size:var(--font-size-small);font-weight:var(--font-weight-medium);color:var(--color-gray-500);cursor:pointer;transition:all var(--transition-base);background:0 0;border:none;border-radius:6px;padding:6px 14px;position:relative}.btn-filter:hover{color:var(--color-gray-700);background:#ffffffb3}.btn-filter--active{color:var(--color-primary-600);box-shadow:var(--shadow-sm);font-weight:var(--font-weight-semibold);background:#fff}.btn-filter--active:hover{color:var(--color-primary-600);background:#fff}.footer-info{font-size:var(--font-size-caption);color:var(--color-gray-400);letter-spacing:.01em}@media (width<=480px){.app-header{padding:var(--spacing-md) var(--spacing-sm) var(--spacing-base)}.header-inner{gap:var(--spacing-sm)}.app-title{font-size:22px}.app-logo{width:32px;height:32px}.app-main{padding:var(--spacing-md) var(--spacing-sm)}.add-todo-form{gap:var(--spacing-sm);flex-direction:column}.btn-add{width:100%;padding:var(--spacing-base)}.todo-item{padding:var(--spacing-base) 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solid #0000000a;width:100%;max-width:380px;animation:.3s cubic-bezier(.34,1.56,.64,1) both modalSlideUp;box-shadow:0 20px 60px -12px #00000040,0 8px 24px -8px #0000001a}.modal-icon-wrapper{width:52px;height:52px;margin:0 auto var(--spacing-md);border-radius:var(--radius-full);background:linear-gradient(135deg,#fef2f2 0%,#fee2e2 100%);border:1px solid #ef44441a;justify-content:center;align-items:center;display:flex}.modal-icon{width:26px;height:26px;color:var(--color-danger)}.modal-title{font-size:var(--font-size-h2);font-weight:var(--font-weight-bold);color:var(--color-gray-900);margin-bottom:var(--spacing-xs);line-height:var(--line-height-tight)}.modal-text{font-size:var(--font-size-small);color:var(--color-gray-400);margin-bottom:var(--spacing-xs)}.modal-todo-content{font-size:var(--font-size-body);color:var(--color-gray-700);font-weight:var(--font-weight-medium);background:var(--color-gray-50);padding:10px var(--spacing-md);border-radius:var(--radius-md);border:1px solid 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#ef444466}@media (width<=480px){.modal-card{max-width:100%;padding:var(--spacing-lg) var(--spacing-md) var(--spacing-md)}.modal-actions{flex-direction:column-reverse}.btn-modal{width:100%}}.header-stats{font-size:var(--font-size-caption);font-weight:var(--font-weight-semibold);color:#fffffff2;border-radius:var(--radius-full);letter-spacing:.02em;-webkit-backdrop-filter:blur(4px);white-space:nowrap;background:#ffffff2e;border:1px solid #ffffff40;margin-left:auto;padding:4px 12px}.status-banner{align-items:center;gap:var(--spacing-sm);padding:10px var(--spacing-md);border-radius:var(--radius-md);font-size:var(--font-size-small);font-weight:var(--font-weight-medium);margin-bottom:var(--spacing-md);animation:.2s ease-out fadeInUp;display:flex}.status-banner--offline{background:var(--color-warning-light);color:#92400e;border:1px solid #fde68a}.status-banner--error{background:var(--color-danger-light);color:#991b1b;border:1px solid #fecaca}.btn-dismiss{cursor:pointer;color:inherit;opacity:.6;transition:opacity var(--transition-fast);background:0 0;border:none;margin-left:auto;padding:0 4px;font-size:18px;line-height:1}.btn-dismiss:hover{opacity:1}.loading-state{padding:var(--spacing-3xl) var(--spacing-lg);justify-content:center;align-items:center;gap:var(--spacing-md);color:var(--color-gray-400);font-size:var(--font-size-small);flex-direction:column;display:flex}@keyframes spinRotate{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.loading-spinner{border:3px solid var(--color-gray-200);border-top-color:var(--color-primary-500);border-radius:50%;width:32px;height:32px;animation:.8s linear infinite spinRotate}@media (width<=480px){.header-stats{padding:3px 8px;font-size:11px}}