/* =========================================
   第二步：完整样式表 (style.css)
   现代简约风格 · 响应式 · 鱼骨屏
   ========================================= */

/* ---------- 基础重置与变量 ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #ffffff;
  --color-surface: #f8f9fa;
  --color-text: #1a1a1a;
  --color-text-secondary: #5f6368;
  --color-border: #e0e0e0;
  --color-input-bg: #ffffff;
  --color-input-border: #111111;
  --color-input-focus: #000000;
  --color-primary: #111111;
  --color-green: #2e7d32;        /* 选中选项卡绿色 */
  --color-green-bg: #e8f5e9;     /* 绿色浅背景 */
  --color-danger: #c62828;
  --color-danger-bg: #ffebee;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --transition: 0.2s ease;
}

body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* 主容器 */
.app-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
}

/* ---------- 鱼骨屏 ---------- */
.skeleton-screen {
  display: block;
}

.skeleton-block {
  background: #f0f0f0;
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

/* 闪烁动画 */
.skeleton-block::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 200%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255,255,255,0.5) 25%,
    rgba(255,255,255,0.7) 50%,
    rgba(255,255,255,0.5) 75%,
    transparent 100%
  );
  animation: shimmer 1.8s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* 真实内容初始隐藏 */
.main-content {
  display: none;
}

/* 加载完成后由JS切换显示 */
.main-content.visible {
  display: block;
}

/* ---------- 输入区域 ---------- */
.add-task-section {
  margin-bottom: 1.5rem;
}

.input-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
}

.input-field {
  flex: 1 1 160px;
  min-width: 140px;
}

.task-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  background: var(--color-input-bg);
  border: 2px solid var(--color-input-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.task-input:focus {
  border-color: var(--color-input-focus);
  box-shadow: 0 0 0 3px rgba(0,0,0,0.06);
}

.task-input::placeholder {
  color: #9e9e9e;
}

.btn-add {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 1.4rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background var(--transition), transform 0.1s;
  white-space: nowrap;
}

.btn-add:hover {
  background: #333333;
}

.btn-add:active {
  transform: scale(0.97);
}

/* ---------- 筛选与搜索行 ---------- */
.filter-search-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  flex: 1 1 auto;
}

.filter-btn {
  padding: 0.5rem 1rem;
  background: var(--color-surface);
  border: 1px solid transparent;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.filter-btn:hover {
  background: #eeeeee;
}

/* 当前选中的选项卡：绿色背景 */
.filter-btn.active {
  background: var(--color-green-bg);
  color: var(--color-green);
  border-color: var(--color-green);
  font-weight: 600;
}

/* 更多下拉容器 */
.more-dropdown {
  position: relative;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 110%;
  left: 0;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  min-width: 140px;
  z-index: 20;
  padding: 0.25rem 0;
}

.dropdown-menu.show {
  display: block;
}

.dropdown-item {
  display: block;
  width: 100%;
  padding: 0.6rem 1rem;
  background: none;
  border: none;
  text-align: left;
  font-size: 0.85rem;
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.15s;
}

.dropdown-item:hover {
  background: #f5f5f5;
}

/* 搜索框 */
.search-box {
  position: relative;
  flex: 0 1 240px;
  min-width: 180px;
}

.search-input {
  width: 100%;
  padding: 0.6rem 1rem 0.6rem 2.3rem;
  background: var(--color-input-bg);
  border: 2px solid var(--color-input-border);
  border-radius: 24px;
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input:focus {
  border-color: var(--color-input-focus);
  box-shadow: 0 0 0 3px rgba(0,0,0,0.05);
}

.search-icon {
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  color: #757575;
  pointer-events: none;
}

/* ---------- 批量操作与统计栏 ---------- */
.action-stats-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding: 0.5rem 0;
}

.batch-actions {
  display: flex;
  gap: 0.4rem;
}

.btn-action {
  padding: 0.45rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--color-border);
  background: white;
  border-radius: 20px;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-action:hover {
  background: #f5f5f5;
  border-color: #bdbdbd;
}

.btn-danger {
  color: var(--color-danger);
  border-color: #ef9a9a;
}

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

.stats {
  display: flex;
  gap: 1.2rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.stat-item strong {
  color: var(--color-text);
  margin-left: 0.2rem;
}

/* ---------- 任务卡片列表 ---------- */
.task-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* 单个任务卡片 */
.task-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.task-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #bdbdbd;
}

/* 选择框 */
.task-checkbox {
  margin-top: 0.2rem;
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--color-green);
  flex-shrink: 0;
  cursor: pointer;
}

/* 卡片内容 */
.task-body {
  flex: 1;
  min-width: 0;
}

.task-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  word-break: break-word;
  color: var(--color-text);
}

.task-content {
  font-size: 0.9rem;
  color: #424242;
  margin-bottom: 0.2rem;
  word-break: break-word;
}

.task-note {
  font-size: 0.8rem;
  color: #757575;
  font-style: italic;
  margin-bottom: 0.4rem;
  word-break: break-word;
}

.task-time {
  font-size: 0.75rem;
  color: #9e9e9e;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* 卡片右侧操作按钮 */
.task-actions {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex-shrink: 0;
}

.icon-btn {
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 0.3rem;
  cursor: pointer;
  color: #757575;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover {
  background: #f0f0f0;
  color: #000;
}

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

/* 已完成状态样式 */
.task-card.completed .task-title,
.task-card.completed .task-content {
  text-decoration: line-through;
  color: #9e9e9e;
}

/* 空状态占位 */
.task-placeholder {
  text-align: center;
  padding: 2.5rem;
  color: #9e9e9e;
  font-size: 0.95rem;
}

/* ---------- 模态框 ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-card {
  background: white;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 420px;
  padding: 1.5rem;
  box-shadow: 0 12px 32px rgba(0,0,0,0.18);
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.modal-body label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
  margin-top: 0.75rem;
  color: var(--color-text-secondary);
}

.modal-input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-size: 0.9rem;
  border: 2px solid #000;
  border-radius: var(--radius-sm);
  outline: none;
  background: white;
  transition: border-color var(--transition);
}

.modal-input:focus {
  border-color: var(--color-green);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.btn {
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: background var(--transition), opacity var(--transition);
}

.btn-cancel {
  background: #f0f0f0;
  color: #333;
}

.btn-cancel:hover {
  background: #e0e0e0;
}

.btn-save {
  background: var(--color-primary);
  color: white;
}

.btn-save:hover {
  background: #333;
}

.modal-confirm p {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

/* ---------- 响应式调整 ---------- */
@media (max-width: 600px) {
  .app-container {
    padding: 1rem 0.75rem 2rem;
  }
  .input-grid {
    flex-direction: column;
  }
  .input-field {
    flex: 1 1 auto;
    min-width: 0;
  }
  .btn-add {
    justify-content: center;
    width: 100%;
  }
  .filter-search-row {
    flex-direction: column;
    align-items: stretch;
  }
  .filter-tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0.25rem;
  }
  .search-box {
    flex: 1 1 auto;
    min-width: 0;
  }
  .action-stats-bar {
    flex-direction: column;
    align-items: flex-start;
  }
  .stats {
    gap: 1rem;
  }
  .task-card {
    flex-wrap: wrap;
  }
  .task-actions {
    flex-direction: row;
    margin-left: auto;
  }
}