/* ===== 基础样式 ===== */
:root {
  --blue: #2563eb;
  --blue-light: #dbeafe;
  --green: #16a34a;
  --green-light: #dcfce7;
  --red: #dc2626;
  --red-light: #fee2e2;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.15);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--gray-100);
  color: var(--gray-900);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

#app {
  max-width: 1200px;
  margin: 0 auto;
  padding-bottom: 40px;
}

/* ===== 顶部标题栏 ===== */
.header {
  background: var(--blue);
  padding: 14px 16px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(37,99,235,0.3);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
}

.logo svg {
  flex-shrink: 0;
}

.logo h1 {
  font-size: 20px;
  font-weight: 700;
  white-space: nowrap;
}

.btn-add {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #fff;
  color: var(--blue);
  border: none;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-add:hover {
  background: var(--gray-100);
  transform: translateY(-1px);
}

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

/* ===== 统计卡片 ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 16px;
  max-width: 1200px;
  margin: 0 auto;
}

.stat-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--blue);
}

.stat-card.stat-paid { border-left-color: var(--green); }
.stat-card.stat-unpaid { border-left-color: var(--red); }
.stat-card.stat-amount { border-left-color: #f59e0b; }

.stat-label {
  font-size: 12px;
  color: var(--gray-500);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--gray-900);
}

/* ===== 筛选栏 ===== */
.filter-bar {
  display: flex;
  gap: 12px;
  padding: 0 16px 16px;
  max-width: 1200px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.search-box {
  flex: 1;
  min-width: 200px;
  position: relative;
  display: flex;
  align-items: center;
}

.search-box svg {
  position: absolute;
  left: 12px;
  color: var(--gray-500);
}

.search-box input {
  width: 100%;
  padding: 8px 12px 8px 38px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: #fff;
  outline: none;
  transition: border-color 0.2s;
}

.search-box input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px var(--blue-light);
}

.filter-group {
  display: flex;
  gap: 8px;
}

.filter-group select {
  padding: 8px 12px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: #fff;
  cursor: pointer;
  outline: none;
}

.filter-group select:focus {
  border-color: var(--blue);
}

/* ===== 桌面端表格 ===== */
.table-container {
  padding: 0 16px;
  max-width: 1200px;
  margin: 0 auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.data-table thead {
  background: var(--gray-50);
}

.data-table th {
  padding: 12px 14px;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-200);
  white-space: nowrap;
}

.data-table td {
  padding: 10px 14px;
  font-size: 14px;
  border-bottom: 1px solid var(--gray-100);
}

.data-table tbody tr:hover {
  background: var(--gray-50);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* 状态标签 */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.status-badge.paid {
  background: var(--green-light);
  color: var(--green);
}

.status-badge.unpaid {
  background: var(--red-light);
  color: var(--red);
}

.status-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* 金额样式 */
.amount-text {
  font-weight: 600;
  font-size: 15px;
}

/* 操作按钮 */
.action-btns {
  display: flex;
  gap: 6px;
}

.action-btn {
  border: none;
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.action-btn.edit {
  background: var(--blue-light);
  color: var(--blue);
}

.action-btn.edit:hover {
  background: var(--blue);
  color: #fff;
}

.action-btn.delete {
  background: var(--gray-100);
  color: var(--gray-500);
}

.action-btn.delete:hover {
  background: var(--red);
  color: #fff;
}

/* 快捷状态切换 */
.quick-toggle {
  cursor: pointer;
}

/* ===== 移动端卡片 ===== */
.mobile-view {
  display: none;
}

.card-list {
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.payment-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--gray-300);
}

.payment-card.paid {
  border-left-color: var(--green);
}

.payment-card.unpaid {
  border-left-color: var(--red);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}

.card-customer {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-900);
}

.card-actions {
  display: flex;
  gap: 6px;
}

.card-actions .action-btn {
  padding: 4px 8px;
  font-size: 11px;
}

.card-amount {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.card-amount.paid {
  color: var(--green);
}

.card-amount.unpaid {
  color: var(--red);
}

.card-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.card-meta-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
}

.card-meta-label {
  color: var(--gray-500);
}

.card-meta-value {
  color: var(--gray-700);
}

.card-remark {
  margin-top: 8px;
  padding: 6px 8px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--gray-700);
}

/* ===== 空状态 ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--gray-500);
}

.empty-state svg {
  margin-bottom: 16px;
  opacity: 0.3;
}

.empty-state p {
  font-size: 15px;
}

/* ===== 弹窗 ===== */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  justify-content: center;
  align-items: center;
  padding: 16px;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: #fff;
  border-radius: var(--radius);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--gray-200);
}

.modal-header h2 {
  font-size: 18px;
  font-weight: 700;
}

.btn-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--gray-500);
  border-radius: var(--radius-sm);
}

.btn-close:hover {
  background: var(--gray-100);
}

.modal-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="datetime-local"] {
  padding: 10px 12px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px var(--blue-light);
}

/* 状态切换按钮 */
.status-toggle {
  display: flex;
  gap: 8px;
}

.status-option {
  flex: 1;
  cursor: pointer;
}

.status-option input {
  display: none;
}

.status-label {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--gray-200);
  font-size: 14px;
  font-weight: 600;
  transition: all 0.15s;
  user-select: none;
}

.status-option input:checked + .status-label.unpaid-label {
  border-color: var(--red);
  background: var(--red-light);
  color: var(--red);
}

.status-option input:checked + .status-label.paid-label {
  border-color: var(--green);
  background: var(--green-light);
  color: var(--green);
}

.modal-footer {
  display: flex;
  gap: 8px;
  padding: 16px 20px;
  border-top: 1px solid var(--gray-200);
}

.modal-footer button {
  flex: 1;
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
}

.btn-cancel {
  background: var(--gray-100);
  color: var(--gray-700);
}

.btn-cancel:hover {
  background: var(--gray-200);
}

.btn-save {
  background: var(--blue);
  color: #fff;
}

.btn-save:hover {
  background: #1d4ed8;
}

/* ===== 同步指示器 ===== */
.sync-indicator {
  position: fixed;
  bottom: 16px;
  right: 16px;
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(17,24,39,0.85);
  color: #fff;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  z-index: 150;
  backdrop-filter: blur(8px);
}

.sync-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
}

.sync-indicator.syncing .sync-dot {
  background: #f59e0b;
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .desktop-view { display: none; }
  .mobile-view { display: block; }
  
  .logo h1 {
    font-size: 17px;
  }
  
  .btn-add span {
    display: none;
  }
  
  .btn-add {
    padding: 8px 10px;
  }
  
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    padding: 12px;
  }
  
  .stat-card {
    padding: 10px 12px;
  }
  
  .stat-value {
    font-size: 18px;
  }
  
  .filter-bar {
    padding: 0 12px 12px;
    flex-direction: column;
  }
  
  .filter-group {
    width: 100%;
  }
  
  .filter-group select {
    flex: 1;
  }
  
  .search-box input {
    font-size: 16px;
  }
  
  .card-list {
    padding: 0 12px;
  }
  
  .modal {
    max-width: 100%;
  }
  
  .sync-indicator {
    bottom: 12px;
    right: 12px;
  }
}

@media (min-width: 769px) {
  .mobile-view { display: none; }
}