/* ============================================================
   SkyData — 中国民航运行态势智能分析平台
   公共样式：CSS变量、布局、导航、暗色模式、响应式
   ============================================================ */

/* ---------- CSS 变量 (亮色主题默认) ---------- */
:root {
  --color-primary: #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-primary-light: #DBEAFE;
  --color-secondary: #7C3AED;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-info: #06B6D4;

  --bg-body: #F1F5F9;
  --bg-card: #FFFFFF;
  --bg-nav: rgba(255, 255, 255, 0.92);
  --bg-input: #F8FAFC;
  --bg-hover: #F1F5F9;

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --text-link: #2563EB;

  --border: #E2E8F0;
  --border-light: #F1F5F9;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.08), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.10), 0 10px 10px rgba(0, 0, 0, 0.04);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  --transition: 0.2s ease;
  --transition-slow: 0.35s ease;

  --font-sans: system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'SF Mono', 'Consolas', monospace;

  --sidebar-width: 0;
}

/* ---------- 暗色主题 ---------- */
html.dark {
  --bg-body: #0F172A;
  --bg-card: #1E293B;
  --bg-nav: rgba(15, 23, 42, 0.92);
  --bg-input: #1E293B;
  --bg-hover: #334155;

  --text-primary: #F1F5F9;
  --text-secondary: #CBD5E1;
  --text-muted: #64748B;
  --text-link: #93C5FD;

  --border: #334155;
  --border-light: #1E293B;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.20);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.25), 0 1px 2px rgba(0, 0, 0, 0.20);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.30), 0 2px 4px rgba(0, 0, 0, 0.20);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.35), 0 4px 6px rgba(0, 0, 0, 0.20);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.40), 0 10px 10px rgba(0, 0, 0, 0.20);
}

/* ---------- 全局重置 ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition-slow), color var(--transition-slow);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--text-link); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }

img { max-width: 100%; display: block; }

/* ---------- 导航栏 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition-slow), border-color var(--transition-slow);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-brand .logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-size: 1.1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 0.45rem 1rem;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

html.dark .nav-links a.active {
  background: rgba(37, 99, 235, 0.15);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* 主题切换按钮 */
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ---------- 主内容区 ---------- */
.main-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem 2rem 3rem;
}

.page-header {
  margin-bottom: 1.5rem;
}

.page-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.page-header .subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  transition: all var(--transition-slow);
}

.card:hover { box-shadow: var(--shadow-md); }

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- KPI 指标卡片 ---------- */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow);
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.kpi-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.kpi-card .kpi-accent {
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  border-radius: 4px 0 0 4px;
}

.kpi-card .kpi-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.3rem;
}

.kpi-card .kpi-value {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.kpi-card .kpi-change {
  font-size: 0.82rem;
  font-weight: 600;
  margin-top: 0.25rem;
}

.kpi-card .kpi-change.up { color: var(--color-success); }
.kpi-card .kpi-change.down { color: var(--color-danger); }

.kpi-card .kpi-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 0.15rem;
}

/* 特殊KPI卡片样式 — 指数卡片 */
.kpi-card.index-card {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-card));
  border-width: 2px;
}

.kpi-card.index-card.sci {
  border-color: var(--color-primary);
}

.kpi-card.index-card.fdi {
  border-color: var(--color-secondary);
}

.kpi-card.index-card .kpi-value {
  font-size: 2.2rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- 图表容器 ---------- */
.chart-container {
  position: relative;
  width: 100%;
  min-height: 320px;
}

.chart-container.large {
  min-height: 420px;
}

.chart-container canvas {
  width: 100% !important;
  height: 100% !important;
}

/* ---------- 双列网格 ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.grid-2-1 {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.25rem;
}

.grid-1-2 {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 1.25rem;
}

/* ---------- 表格 ---------- */
.data-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.data-table th {
  background: var(--bg-hover);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.7rem 0.9rem;
  text-align: left;
  white-space: nowrap;
  border-bottom: 2px solid var(--border);
  cursor: pointer;
  user-select: none;
  transition: color var(--transition);
}

.data-table th:hover { color: var(--color-primary); }

.data-table th .sort-icon {
  margin-left: 0.25rem;
  opacity: 0.4;
}

.data-table th.sorted .sort-icon { opacity: 1; }

.data-table td {
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.data-table tr:hover td { background: var(--bg-hover); }

.data-table .mom-pos { color: var(--color-success); font-weight: 600; }
.data-table .mom-neg { color: var(--color-danger); font-weight: 600; }

.data-table .highlight-row td {
  background: var(--color-primary-light);
  font-weight: 600;
}

html.dark .data-table .highlight-row td {
  background: rgba(37, 99, 235, 0.12);
}

/* ---------- 预测相关样式 ---------- */
.forecast-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.forecast-badge.up {
  background: #D1FAE5;
  color: #065F46;
}

.forecast-badge.down {
  background: #FEE2E2;
  color: #991B1B;
}

.forecast-badge.stable {
  background: #E0E7FF;
  color: #3730A3;
}

html.dark .forecast-badge.up { background: rgba(16, 185, 129, 0.15); color: #6EE7B7; }
html.dark .forecast-badge.down { background: rgba(239, 68, 68, 0.15); color: #FCA5A5; }
html.dark .forecast-badge.stable { background: rgba(99, 102, 241, 0.15); color: #A5B4FC; }

/* 置信度标签 */
.confidence-tag {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.confidence-tag.high { background: #D1FAE5; color: #065F46; }
.confidence-tag.medium { background: #FEF3C7; color: #92400E; }
.confidence-tag.low { background: #FEE2E2; color: #991B1B; }

html.dark .confidence-tag.high { background: rgba(16, 185, 129, 0.2); color: #6EE7B7; }
html.dark .confidence-tag.medium { background: rgba(245, 158, 11, 0.2); color: #FCD34D; }
html.dark .confidence-tag.low { background: rgba(239, 68, 68, 0.2); color: #FCA5A5; }

/* 异常标记 */
.anomaly-marker {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
}

.anomaly-marker.warning { background: #FEF3C7; color: #92400E; }
.anomaly-marker.extreme { background: #FEE2E2; color: #991B1B; }

/* ---------- 智能分析模块 ---------- */
.insight-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.insight-panel .insight-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-light);
}

.insight-panel .insight-header .icon {
  font-size: 1.3rem;
}

.insight-panel .insight-header h3 {
  font-size: 1rem;
  font-weight: 700;
}

.insight-tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.5rem;
}

.insight-tab {
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-secondary);
  border: none;
  background: none;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.insight-tab:hover { background: var(--bg-hover); color: var(--text-primary); }

.insight-tab.active {
  background: var(--color-primary);
  color: #FFF;
}

.insight-content {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.insight-content p {
  margin-bottom: 0.6rem;
  padding-left: 1.2rem;
  position: relative;
}

.insight-content p::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  opacity: 0.5;
}

.insight-content .highlight {
  color: var(--color-primary);
  font-weight: 600;
}

.insight-content .warning-text {
  color: var(--color-danger);
  font-weight: 600;
}

/* ---------- 标签页切换器 ---------- */
.tab-bar {
  display: flex;
  gap: 0.25rem;
  padding: 0.25rem;
  background: var(--bg-hover);
  border-radius: var(--radius);
  width: fit-content;
  margin-bottom: 1rem;
}

.tab-btn {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  background: none;
  color: var(--text-secondary);
  transition: all var(--transition);
  font-family: var(--font-sans);
  white-space: nowrap;
}

.tab-btn:hover { color: var(--text-primary); }

.tab-btn.active {
  background: var(--bg-card);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

/* ---------- 自定义多选 ---------- */
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.checkbox-label:hover { border-color: var(--color-primary); }

.checkbox-label.checked {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.checkbox-label input { display: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.btn-primary {
  background: var(--color-primary);
  color: #FFF;
}

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

.btn-outline {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn-sm {
  padding: 0.3rem 0.7rem;
  font-size: 0.78rem;
}

/* ---------- 模型说明窗口 ---------- */
.model-info {
  background: var(--bg-hover);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.model-info strong {
  color: var(--text-secondary);
}

/* ---------- 预测摘要卡 ---------- */
.forecast-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.forecast-stat {
  text-align: center;
  padding: 0.75rem;
  background: var(--bg-hover);
  border-radius: var(--radius);
}

.forecast-stat .stat-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}

.forecast-stat .stat-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* ---------- 页脚 ---------- */
.footer {
  text-align: center;
  padding: 1.5rem 2rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border-light);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1200px) {
  .kpi-grid { grid-template-columns: repeat(4, 1fr); }
  .grid-3 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 1024px) {
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .grid-2-1, .grid-1-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .main-content { padding: 1rem 1.25rem 2rem; }
}

@media (max-width: 768px) {
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .navbar { padding: 0 1rem; height: 52px; }
  .nav-links a { padding: 0.35rem 0.6rem; font-size: 0.8rem; }
  .main-content { padding: 0.75rem 1rem 1.5rem; }
  .page-header h1 { font-size: 1.35rem; }
  .forecast-summary { grid-template-columns: 1fr; }
  .kpi-card .kpi-value { font-size: 1.4rem; }
}

@media (max-width: 480px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .nav-brand span { display: none; }
}

/* ---------- 动画 ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes countUp {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-in {
  animation: fadeInUp 0.5s ease forwards;
}

.stagger-1 { animation-delay: 0.05s; }
.stagger-2 { animation-delay: 0.1s; }
.stagger-3 { animation-delay: 0.15s; }
.stagger-4 { animation-delay: 0.2s; }
.stagger-5 { animation-delay: 0.25s; }
.stagger-6 { animation-delay: 0.3s; }

/* ---------- 加载状态 ---------- */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.loading::after {
  content: '';
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-left: 0.6rem;
}

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

/* ---------- 工具提示 ---------- */
.tooltip-trigger {
  cursor: help;
  border-bottom: 1px dashed var(--text-muted);
}