/* ========== CSS 变量 / 主题定义 ========== */
:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --primary-light: #e8f0fe;
  --success: #34a853;
  --success-light: #e6f4ea;
  --danger: #ea4335;
  --danger-light: #fce8e6;
  --warning: #fbbc04;
  --warning-light: #fef7e0;
  --bg: #f5f7fa;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  --text: #202124;
  --text-secondary: #5f6368;
  --text-muted: #9aa0a6;
  --border: #dadce0;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 20px rgba(0,0,0,0.12);
  --radius: 8px;
  --radius-sm: 4px;
  --transition: 0.2s ease;
  --top-bar-height: 52px;
  --topbar-bg: linear-gradient(135deg, #1a237e, #283593, #1a73e8);
}

/* ========== 暗色模式 ========== */
[data-theme="dark"] {
  --primary: #4a9af5;
  --primary-dark: #3b82f6;
  --primary-light: #1e3a5f;
  --success: #4ade80;
  --success-light: #1a3a2a;
  --danger: #f87171;
  --danger-light: #3a1a1a;
  --warning: #fbbf24;
  --warning-light: #3a2e0a;
  --bg: #1a1a2e;
  --bg-card: #242438;
  --bg-input: #2a2a40;
  --text: #e8e8f0;
  --text-secondary: #a0a0b8;
  --text-muted: #707088;
  --border: #3a3a52;
  --shadow: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-lg: 0 4px 20px rgba(0,0,0,0.4);
  --topbar-bg: linear-gradient(135deg, #0d1117, #161b22, #1a237e);
}

/* 平滑过渡 - 只对关键视觉属性 */
body, .card, .form-input, .btn, .top-bar, .footer, .mode-card, .dash-card, .history-table, .qmg-table, .gen-card, .about-section, input, select, textarea, .toolbar, .empty-state, .loading, .top-bar-info .info-item, .qmg-filters, .qmg-tab, .version-list li, .dash-stat, .dash-card-mini {
  transition: background-color 0.5s ease, color 0.5s ease, border-color 0.5s ease, box-shadow 0.5s ease;
}

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

html {
  font-size: 16px;
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
}

/* ========== 置顶信息栏 ========== */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--top-bar-height);
  background: var(--topbar-bg);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
}

.top-bar-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-bar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.brand-icon {
  font-size: 1.4rem;
}

.top-bar-info {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
}

.top-bar-info .info-item {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  background: rgba(255,255,255,0.15);
  border-radius: 12px;
  white-space: nowrap;
}

.top-bar-info .info-label {
  opacity: 0.75;
  font-size: 0.75rem;
}

.top-bar-info .info-value {
  font-weight: 600;
}

.top-bar-info .btn-logout {
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  padding: 4px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  transition: var(--transition);
}

.top-bar-info .btn-logout:hover {
  background: rgba(255,255,255,0.35);
}

/* ========== 主内容容器 ========== */
.app-container {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px;
}

/* ========== 页脚 ========== */
.footer {
  text-align: center;
  padding: 16px;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

/* ========== 通用卡片 ========== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  margin-bottom: 20px;
}

.card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-light);
  color: var(--primary);
}

/* ========== 通用按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 22px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
  text-decoration: none;
}

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

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); }

.btn-success {
  background: var(--success);
  color: #fff;
}
.btn-success:hover { background: #2d9249; }

.btn-danger {
  background: var(--danger);
  color: #fff;
}
.btn-danger:hover { background: #d33426; }

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-outline:hover { background: var(--primary-light); }

.btn-lg {
  padding: 14px 32px;
  font-size: 1.1rem;
  border-radius: var(--radius);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.8rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ========== 通用表单 ========== */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: var(--transition);
  outline: none;
  background: var(--bg-input);
}

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

.form-error {
  color: var(--danger);
  font-size: 0.8rem;
  margin-top: 4px;
  min-height: 18px;
}

/* ========== 模式选择卡片 ========== */
.mode-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.mode-card {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}

.mode-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.mode-card.selected {
  border-color: var(--primary);
  background: var(--primary-light);
}

.mode-card-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.mode-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.mode-card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ========== 加载/空状态 ========== */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
}

.spinner {
  display: inline-block;
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.empty-state {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 8px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .mode-cards {
    grid-template-columns: 1fr;
  }

  .top-bar-inner {
    flex-direction: column;
    gap: 6px;
    padding: 6px 10px;
  }

  .top-bar {
    height: auto;
    min-height: var(--top-bar-height);
  }

  .app-container {
    padding: 16px 10px;
  }
}