@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;600&display=swap');

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Plus Jakarta Sans', '微软雅黑', sans-serif;
    }

    body {
      min-height: 100vh;
      padding: 24px;
      background: radial-gradient(circle at 20% 20%, #f4f7ff, #f8f9fb 40%, #eef2ff 70%);
      color: #1f2937;
    }

    .page {
      max-width: 840px;
      margin: 0 auto;
    }

    .heading {
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      flex-wrap: wrap;
    }

    h1 {
      font-size: 28px;
      letter-spacing: 0.2px;
      color: #0f172a;
    }

    .badge {
      background: rgba(99, 102, 241, 0.12);
      color: #4338ca;
      padding: 8px 12px;
      border-radius: 999px;
      font-weight: 600;
      font-size: 13px;
    }

    .todo-container {
      background: #fff;
      border-radius: 16px;
      box-shadow:
        0 20px 60px rgba(15, 23, 42, 0.08),
        0 2px 8px rgba(15, 23, 42, 0.05);
      padding: 28px;
      border: 1px solid #e5e7eb;
    }

    .todo-add {
      display: flex;
      gap: 12px;
      margin-bottom: 22px;
    }

    #todo-input {
      flex: 1;
      padding: 14px 16px;
      border: 1px solid #e5e7eb;
      border-radius: 12px;
      font-size: 16px;
      transition: border 0.2s ease, box-shadow 0.2s ease;
      background: #f9fafb;
    }

    #todo-input:focus {
      outline: none;
      border-color: #6366f1;
      box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
      background: #fff;
    }

    #add-btn {
      padding: 14px 22px;
      background: linear-gradient(135deg, #6366f1, #4338ca);
      color: #fff;
      border: none;
      border-radius: 12px;
      cursor: pointer;
      font-size: 15px;
      font-weight: 700;
      letter-spacing: 0.2px;
      transition: transform 0.12s ease, box-shadow 0.2s ease;
      box-shadow: 0 12px 24px rgba(99, 102, 241, 0.25);
    }

    #add-btn:hover {
      transform: translateY(-1px);
      box-shadow: 0 16px 30px rgba(99, 102, 241, 0.3);
    }

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

    .helper {
      display: flex;
      align-items: center;
      gap: 12px;
      color: #6b7280;
      font-size: 14px;
      margin-bottom: 12px;
      flex-wrap: wrap;
    }

    .helper span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 12px;
      background: #f9fafb;
      border-radius: 10px;
      border: 1px dashed #e5e7eb;
    }

    .todo-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .todo-item {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 12px;
      align-items: center;
      padding: 14px 16px;
      border: 1px solid #e5e7eb;
      border-radius: 12px;
      background: #fff;
      transition: border 0.2s ease, box-shadow 0.2s ease, transform 0.1s ease;
      position: relative;
    }

    .todo-item:hover {
      border-color: #c7d2fe;
      box-shadow: 0 12px 22px rgba(99, 102, 241, 0.08);
    }

    .todo-item.dragging {
      opacity: 0.6;
      transform: scale(0.995);
      border-style: dashed;
    }

    .todo-item.drag-over {
      border-color: #818cf8;
      box-shadow: 0 16px 28px rgba(129, 140, 248, 0.18);
    }

    .todo-item.completed .todo-content {
      text-decoration: line-through;
      color: #9ca3af;
    }

    .todo-content {
      font-size: 16px;
      color: #0f172a;
      cursor: pointer;
      line-height: 1.5;
      word-break: break-all;
    }

    .todo-meta {
      display: flex;
      gap: 8px;
      align-items: center;
      font-size: 12px;
      color: #9ca3af;
      margin-top: 6px;
    }

    .pill {
      padding: 4px 8px;
      border-radius: 999px;
      background: #f4f4ff;
      color: #4338ca;
      font-weight: 600;
    }

    .todo-actions {
      display: flex;
      gap: 8px;
      align-items: center;
    }

    .btn {
      padding: 8px 12px;
      border: none;
      border-radius: 10px;
      cursor: pointer;
      font-size: 13px;
      font-weight: 600;
      transition: transform 0.1s ease, box-shadow 0.2s ease;
      border: 1px solid transparent;
    }

    .btn:hover {
      transform: translateY(-1px);
    }

    .edit-btn {
      background: #fff7ed;
      color: #c2410c;
      border-color: #fed7aa;
    }

    .delete-btn {
      background: #fef2f2;
      color: #b91c1c;
      border-color: #fecdd3;
    }

    .move-btn {
      background: #eef2ff;
      color: #4338ca;
      border-color: #c7d2fe;
    }

    .empty {
      text-align: center;
      color: #9ca3af;
      padding: 28px 0;
      border: 1px dashed #e5e7eb;
      border-radius: 12px;
      background: #f9fafb;
    }

    @media (max-width: 600px) {
      .todo-add {
        flex-direction: column;
      }
      #add-btn {
        width: 100%;
      }
      .todo-item {
        grid-template-columns: 1fr;
      }
      .todo-actions {
        justify-content: flex-start;
        flex-wrap: wrap;
      }
    }