*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

    :root {
      --bg-primary: #0a0e13;
      --bg-secondary: #141920;
      --bg-card: #1a1f28;
      --border: #2a3441;
      --accent: #10b981;
      --accent-hover: #059669;
      --danger: #ef4444;
      --warning: #f59e0b;
      --text-primary: #f8fafc;
      --text-secondary: #94a3b8;
      --text-muted: #64748b;
      --transition: 0.3s ease;
    }

    body {
      font-family: 'Inter', sans-serif;
      background: var(--bg-primary);
      color: var(--text-primary);
      min-height: 100vh;
      padding: 40px 20px;
      line-height: 1.6;
    }

    .container {
      max-width: 700px;
      margin: 0 auto;
    }

    /* Header */
    header {
      text-align: center;
      margin-bottom: 50px;
    }

    header h1 {
      font-size: clamp(2rem, 5vw, 2.8rem);
      font-weight: 800;
      margin-bottom: 8px;
      background: linear-gradient(135deg, var(--accent), #34d399);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    header p {
      color: var(--text-secondary);
      font-size: 1rem;
    }

    /* Stats Bar */
    .stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-bottom: 30px;
    }

    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 20px;
      text-align: center;
    }

    .stat-card .label {
      font-size: 0.8rem;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 8px;
    }

    .stat-card .value {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* Add Todo Form */
    .add-todo {
      background: var(--bg-secondary);
      border: 2px solid var(--border);
      border-radius: 12px;
      padding: 24px;
      margin-bottom: 30px;
    }

    .input-group {
      display: flex;
      gap: 12px;
      margin-bottom: 16px;
    }

    .todo-input {
      flex: 1;
      padding: 14px 18px;
      background: var(--bg-card);
      border: 2px solid var(--border);
      border-radius: 10px;
      color: var(--text-primary);
      font-size: 1rem;
      font-family: inherit;
      transition: all var(--transition);
    }

    .todo-input:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
    }

    .todo-input::placeholder {
      color: var(--text-muted);
    }

    .add-btn {
      padding: 14px 32px;
      background: var(--accent);
      color: white;
      border: none;
      border-radius: 10px;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition);
      white-space: nowrap;
    }

    .add-btn:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
    }

    .add-btn:active {
      transform: translateY(0);
    }

    /* Priority Selector */
    .priority-selector {
      display: flex;
      gap: 8px;
    }

    .priority-btn {
      flex: 1;
      padding: 10px;
      background: var(--bg-card);
      border: 2px solid var(--border);
      border-radius: 8px;
      color: var(--text-secondary);
      font-size: 0.85rem;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition);
    }

    .priority-btn:hover {
      border-color: var(--accent);
    }

    .priority-btn.active {
      border-color: var(--accent);
      background: rgba(16, 185, 129, 0.1);
      color: var(--accent);
    }

    .priority-btn.high.active {
      border-color: var(--danger);
      background: rgba(239, 68, 68, 0.1);
      color: var(--danger);
    }

    .priority-btn.medium.active {
      border-color: var(--warning);
      background: rgba(245, 158, 11, 0.1);
      color: var(--warning);
    }

    /* Filter Tabs */
    .filter-tabs {
      display: flex;
      gap: 8px;
      margin-bottom: 24px;
    }

    .filter-tab {
      flex: 1;
      padding: 12px;
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 10px;
      color: var(--text-secondary);
      font-size: 0.9rem;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition);
      text-align: center;
    }

    .filter-tab:hover {
      border-color: var(--accent);
      color: var(--text-primary);
    }

    .filter-tab.active {
      background: var(--accent);
      border-color: var(--accent);
      color: white;
    }

    /* Todo List */
    .todo-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .todo-item {
      background: var(--bg-secondary);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      gap: 16px;
      transition: all var(--transition);
      animation: slideIn 0.3s ease;
    }

    @keyframes slideIn {
      from { opacity: 0; transform: translateY(-10px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .todo-item:hover {
      border-color: var(--accent);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }

    .todo-item.completed {
      opacity: 0.6;
    }

    .todo-item.completed .todo-text {
      text-decoration: line-through;
      color: var(--text-muted);
    }

    /* Checkbox */
    .todo-checkbox {
      width: 22px;
      height: 22px;
      border: 2px solid var(--border);
      border-radius: 6px;
      cursor: pointer;
      transition: all var(--transition);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    .todo-checkbox:hover {
      border-color: var(--accent);
    }

    .todo-checkbox.checked {
      background: var(--accent);
      border-color: var(--accent);
    }

    .todo-checkbox.checked::after {
      content: '✓';
      color: white;
      font-size: 0.9rem;
      font-weight: 700;
    }

    /* Todo Content */
    .todo-content {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .todo-text {
      font-size: 1rem;
      color: var(--text-primary);
      word-break: break-word;
    }

    .todo-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.75rem;
    }

    .priority-badge {
      padding: 4px 10px;
      border-radius: 20px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .priority-badge.high {
      background: rgba(239, 68, 68, 0.15);
      color: var(--danger);
    }

    .priority-badge.medium {
      background: rgba(245, 158, 11, 0.15);
      color: var(--warning);
    }

    .priority-badge.low {
      background: rgba(16, 185, 129, 0.15);
      color: var(--accent);
    }

    .todo-time {
      color: var(--text-muted);
    }

    /* Actions */
    .todo-actions {
      display: flex;
      gap: 8px;
    }

    .action-btn {
      width: 36px;
      height: 36px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: all var(--transition);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }

    .edit-btn {
      background: rgba(59, 130, 246, 0.1);
      color: #3b82f6;
    }

    .edit-btn:hover {
      background: #3b82f6;
      color: white;
    }

    .delete-btn {
      background: rgba(239, 68, 68, 0.1);
      color: var(--danger);
    }

    .delete-btn:hover {
      background: var(--danger);
      color: white;
    }

    /* Empty State */
    .empty-state {
      text-align: center;
      padding: 60px 20px;
      color: var(--text-muted);
    }

    .empty-state .icon {
      font-size: 4rem;
      margin-bottom: 16px;
      opacity: 0.5;
    }

    .empty-state h3 {
      font-size: 1.3rem;
      margin-bottom: 8px;
      color: var(--text-secondary);
    }

    /* Responsive */
    @media (max-width: 640px) {
      .stats {
        grid-template-columns: 1fr;
      }

      .input-group {
        flex-direction: column;
      }

      .add-btn {
        width: 100%;
      }

      .filter-tabs {
        flex-direction: column;
      }

      .todo-item {
        flex-wrap: wrap;
      }

      .todo-actions {
        width: 100%;
        justify-content: flex-end;
      }
    }