/* ===== 地表水环境影响预测工具箱 - 共享样式 ===== */

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

:root {
  --primary: #3498db;
  --primary-dark: #2980b9;
  --primary-light: #5dade2;
  --bg-start: #e8f0f8;
  --bg-end: #d5e5f2;
  --card-bg: #ffffff;
  --text-primary: #2c3e50;
  --text-secondary: #5a6c7d;
  --border: #dce6f0;
  --success: #27ae60;
  --warning: #f39c12;
  --danger: #e74c3c;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(52,152,219,0.10);
  --shadow-hover: 0 8px 32px rgba(52,152,219,0.18);
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: linear-gradient(135deg, var(--bg-start) 0%, var(--bg-end) 100%);
  min-height: 100vh;
  color: var(--text-primary);
  line-height: 1.6;
}

/* ===== 顶部导航栏 ===== */
.top-bar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 2px 12px rgba(52,152,219,0.25);
  position: sticky;
  top: 0;
  z-index: 100;
}

.top-bar .back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #fff;
  text-decoration: none;
  background: rgba(255,255,255,0.15);
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 14px;
  transition: var(--transition);
  backdrop-filter: blur(4px);
}

.top-bar .back-btn:hover {
  background: rgba(255,255,255,0.3);
  transform: translateX(-2px);
}

.top-bar .page-title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.top-bar .home-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 1px;
}

/* ===== 首页容器 ===== */
.home-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 24px;
}

.home-header {
  text-align: center;
  margin-bottom: 48px;
}

.home-header h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

.home-header p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.tool-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid transparent;
}

.tool-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: var(--primary-light);
}

.tool-card .card-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: #fff;
  flex-shrink: 0;
}

.tool-card .card-icon.blue { background: linear-gradient(135deg, #3498db, #2980b9); }
.tool-card .card-icon.green { background: linear-gradient(135deg, #27ae60, #1e8449); }
.tool-card .card-icon.orange { background: linear-gradient(135deg, #f39c12, #d68910); }
.tool-card .card-icon.purple { background: linear-gradient(135deg, #9b59b6, #7d3c98); }
.tool-card .card-icon.teal { background: linear-gradient(135deg, #1abc9c, #148f77); }

.tool-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.tool-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===== 工具页面通用 ===== */
.tool-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 32px 24px;
}

/* ===== Tab 切换 ===== */
.tab-nav {
  display: flex;
  gap: 4px;
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 6px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
  overflow-x: auto;
}

.tab-btn {
  flex: 1;
  padding: 12px 16px;
  border: none;
  background: transparent;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.tab-btn:hover {
  background: var(--bg-start);
  color: var(--primary);
}

.tab-btn.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(52,152,219,0.3);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

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

.panel-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--bg-start);
}

/* ===== 公式展示 ===== */
.formula-box {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 20px;
  overflow-x: auto;
  text-align: center;
}

/* ===== 表单布局 ===== */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

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

.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group label .unit {
  font-weight: 400;
  color: #95a5a6;
  font-size: 12px;
}

.form-group input,
.form-group select {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-primary);
  background: #fff;
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(52,152,219,0.12);
}

.form-group input::placeholder {
  color: #bdc3c7;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  box-shadow: 0 4px 12px rgba(52,152,219,0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(52,152,219,0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-start);
  color: var(--primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: #dce6f0;
}

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ===== 结果展示 ===== */
.result-box {
  background: linear-gradient(135deg, #f0f9ff 0%, #e8f4fd 100%);
  border: 1px solid #bee3f8;
  border-radius: 8px;
  padding: 20px;
  margin-top: 20px;
}

.result-box h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(52,152,219,0.08);
}

.result-item:last-child {
  border-bottom: none;
}

.result-item .label {
  font-size: 14px;
  color: var(--text-secondary);
}

.result-item .value {
  font-size: 16px;
  font-weight: 600;
  color: var(--primary-dark);
  font-family: "SF Mono", "Fira Code", monospace;
}

/* ===== 图表容器 ===== */
.chart-container {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  margin-top: 20px;
  border: 1px solid var(--border);
  position: relative;
}

.chart-container canvas {
  max-width: 100%;
}

/* ===== 超标分析 ===== */
.analysis-box {
  background: #fff9f0;
  border: 1px solid #fde8cd;
  border-radius: 8px;
  padding: 16px 20px;
  margin-top: 16px;
}

.analysis-box h4 {
  font-size: 14px;
  font-weight: 600;
  color: #d68910;
  margin-bottom: 10px;
}

.analysis-box .analysis-item {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 13px;
}

/* ===== Plotly 容器 ===== */
.plotly-container {
  width: 100%;
  min-height: 500px;
  margin-top: 20px;
}

/* ===== 可拖动图例 ===== */
.draggable-legend {
  position: absolute;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #ccc;
  border-radius: 5px;
  padding: 10px;
  z-index: 100;
  cursor: move;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  max-width: 220px;
}

.legend-item {
  display: flex;
  align-items: center;
  margin-bottom: 8px;
}

.legend-color {
  width: 20px;
  height: 20px;
  border-radius: 3px;
  margin-right: 10px;
  flex-shrink: 0;
}

.legend-label {
  font-size: 12px;
  color: #333;
  line-height: 1.4;
}

/* ===== 结果表格 ===== */
.result-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}

.result-table thead {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
}

.result-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 14px;
}

.result-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-primary);
}

.result-table tbody tr {
  background: #fff;
  transition: background 0.2s;
}

.result-table tbody tr:hover {
  background: #f8fafc;
}

.result-table .highlight {
  font-weight: 700;
  color: var(--primary);
  font-size: 16px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-top: 8px;
}

.data-table th,
.data-table td {
  padding: 8px 12px;
  text-align: center;
  border: 1px solid var(--border);
}

.data-table th {
  background: var(--bg-start);
  font-weight: 600;
  color: var(--primary-dark);
}

/* ===== Checkbox 切换 ===== */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

.checkbox-group label {
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .home-container { padding: 24px 16px; }
  .home-header h1 { font-size: 26px; }
  .card-grid { grid-template-columns: 1fr; }
  .tool-container { padding: 20px 16px; }
  .form-grid { grid-template-columns: 1fr; }
  .tab-nav { flex-wrap: nowrap; overflow-x: auto; }
  .tab-btn { font-size: 13px; padding: 10px 12px; }
  .top-bar { padding: 12px 16px; }
  .panel-card { padding: 20px 16px; }
}

/* ===== 隐藏自定义输入 ===== */
.custom-input-hidden {
  display: none;
}

.custom-input-visible {
  display: flex;
}

/* ===== 错误提示 ===== */
.error-msg {
  color: var(--danger);
  font-size: 13px;
  margin-top: 4px;
}

/* ===== 加载状态 ===== */
.loading-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(255,255,255,0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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