/* ===== 基础重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f5f6fa;
  color: #333;
  min-height: 100vh;
  overflow-x: hidden;
}
.hidden { display: none !important; }

/* ===== 登录页 ===== */
#login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #1976d2 0%, #0d47a1 100%);
  padding: 20px;
}
.login-box {
  background: white;
  border-radius: 20px;
  padding: 40px 30px;
  width: 100%;
  max-width: 340px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.login-icon { font-size: 60px; margin-bottom: 15px; }
.login-box h1 { font-size: 22px; margin-bottom: 8px; color: #1565c0; }
.login-box p { color: #888; font-size: 14px; margin-bottom: 25px; }
.login-box input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid #e0e0e0;
  border-radius: 12px;
  font-size: 16px;
  margin-bottom: 15px;
  text-align: center;
  letter-spacing: 4px;
}
.login-box input:focus {
  outline: none;
  border-color: #1976d2;
}
.login-box button {
  width: 100%;
  padding: 14px;
  background: #1976d2;
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
}
.login-box button:active { background: #1565c0; }
.error {
  color: #d32f2f;
  font-size: 13px;
  margin-top: 10px;
  min-height: 18px;
}

/* ===== 主应用布局 ===== */
#main-app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-bottom: 60px;
}
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #1976d2;
  color: white;
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.app-header h2 { font-size: 18px; }
.icon-btn {
  background: rgba(255,255,255,0.2);
  border: none;
  color: white;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
}

/* ===== 页面容器 ===== */
.page-container {
  flex: 1;
  padding: 12px;
  overflow-y: auto;
}
.page-content {
  display: none;
}
.page-content.active {
  display: block;
}

/* ===== 卡片 ===== */
.card {
  background: white;
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.card h3 {
  font-size: 14px;
  color: #666;
  margin-bottom: 8px;
}

/* ===== 数据看板 ===== */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}
.stat-card {
  text-align: center;
  padding: 14px 8px;
}
.stat-value {
  font-size: 26px;
  font-weight: 700;
  color: #1976d2;
}
.stat-label {
  font-size: 12px;
  color: #888;
  margin-top: 4px;
}
.stat-card.warning .stat-value { color: #e53935; }
.big-number {
  font-size: 32px;
  font-weight: 700;
  color: #1976d2;
}
.sub-info {
  font-size: 14px;
  color: #888;
  margin-top: 4px;
}

/* ===== 列表 ===== */
.list-container { margin-top: 8px; }
.list-item {
  background: white;
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}
.list-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.list-item-title {
  font-size: 15px;
  font-weight: 600;
}
.list-item-badge {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 10px;
  background: #e3f2fd;
  color: #1976d2;
}
.list-item-badge.warning {
  background: #ffebee;
  color: #c62828;
}
.list-item-info {
  font-size: 13px;
  color: #666;
  line-height: 1.6;
}
.list-item-row {
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
}

/* ===== 搜索/筛选 ===== */
.search-bar, .filter-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.search-bar input, .filter-bar input {
  flex: 1;
  padding: 12px 14px;
  border: 1px solid #ddd;
  border-radius: 10px;
  font-size: 14px;
}
.filter-bar button {
  padding: 12px 20px;
  background: #1976d2;
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  cursor: pointer;
}

/* ===== 底部导航 ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  display: flex;
  justify-content: space-around;
  padding: 6px 0;
  box-shadow: 0 -2px 10px rgba(0,0,0,0.08);
  z-index: 100;
}
.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: none;
  border: none;
  color: #999;
  font-size: 11px;
  padding: 4px 12px;
  cursor: pointer;
}
.nav-item.active { color: #1976d2; }
.nav-icon { font-size: 22px; margin-bottom: 2px; }

/* ===== 标签页 ===== */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.tab-btn {
  flex: 1;
  padding: 10px;
  background: white;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  color: #666;
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
.tab-btn.active {
  background: #1976d2;
  color: white;
}
.data-tab { display: none; }
.data-tab.active { display: block; }

/* ===== 按钮 ===== */
.btn-add {
  width: 100%;
  padding: 12px;
  background: #e8f5e9;
  color: #2e7d32;
  border: 1px dashed #81c784;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 12px;
  cursor: pointer;
}

/* ===== 弹窗 ===== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}
.modal {
  background: white;
  border-radius: 16px;
  padding: 24px;
  width: 100%;
  max-width: 360px;
  max-height: 80vh;
  overflow-y: auto;
}
.modal h3 { margin-bottom: 16px; font-size: 18px; }
.modal input, .modal select {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 12px;
}
.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}
.modal-actions button {
  flex: 1;
  padding: 12px;
  border-radius: 10px;
  border: none;
  font-size: 14px;
  cursor: pointer;
}
.btn-cancel { background: #f5f5f5; color: #666; }
.btn-confirm { background: #1976d2; color: white; }

/* ===== 库存进度条 ===== */
.stock-bar {
  height: 6px;
  background: #eee;
  border-radius: 3px;
  margin-top: 6px;
  overflow: hidden;
}
.stock-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s;
}
.stock-bar-fill.safe { background: #4caf50; }
.stock-bar-fill.warning { background: #ff9800; }
.stock-bar-fill.danger { background: #f44336; }

/* ===== 空状态 ===== */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: #aaa;
}
.empty-state-icon { font-size: 48px; margin-bottom: 10px; }