/*
 * 流量监控页样式
 * 作用：/analytics 页面的统计卡片、双轴折线图、图例、悬浮提示与响应式布局
 */

/* ========== 图表配色（跟随主题） ========== */
:root {
  --chart-requests: #1a7f37;
  --chart-traffic: #0969da;
}

[data-theme="dark"] {
  --chart-requests: #3fb950;
  --chart-traffic: #58a6ff;
}

/* ========== 标题区 ========== */
.analytics-hero {
  padding: 46px 0 8px;
  text-align: center;
}

.analytics-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 800;
  letter-spacing: -0.5px;
}

.analytics-hero p {
  max-width: 700px;
  margin: 12px auto 0;
  color: var(--text-muted);
}

.analytics-section {
  padding: 20px 0 64px;
}

/* ========== 统计卡片 ========== */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.stat-card {
  padding: 18px 20px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-xs);
}

.stat-card h3 {
  margin: 0;
  color: var(--text-faint);
  font-size: 13px;
  font-weight: 600;
}

.stat-value {
  margin: 10px 0 2px;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.5px;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.stat-value.is-loading {
  color: var(--text-faint);
}

.stat-value .unit {
  margin-left: 5px;
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 700;
}

.stat-sub {
  min-height: 20px;
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 12.5px;
}

/* ========== 图表卡片 ========== */
.chart-card {
  margin-top: 16px;
  padding: 20px 20px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-xs);
}

.chart-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px 18px;
  margin-bottom: 12px;
}

.chart-head h2 {
  margin: 0;
  font-size: 18px;
}

.chart-head p {
  margin: 6px 0 0;
  color: var(--text-muted);
  font-size: 13px;
}

.chart-head-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.chart-legend {
  display: inline-flex;
  gap: 16px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--text-muted);
  font-size: 13px;
}

.legend-item i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.legend-requests i {
  background: var(--chart-requests);
}

.legend-traffic i {
  background: var(--chart-traffic);
}

/* ========== 图表主体 ========== */
.chart-body {
  position: relative;
  min-height: 240px;
}

.chart-loading {
  padding: 90px 0;
  color: var(--text-faint);
  font-size: 14px;
  text-align: center;
}

.chart-svg {
  display: block;
  width: 100%;
  height: auto;
}

.chart-svg .chart-grid {
  stroke: var(--border);
  stroke-dasharray: 3 5;
  stroke-width: 1;
}

.chart-svg .chart-axis {
  stroke: var(--border);
  stroke-width: 1;
}

.chart-svg .chart-axis-text {
  fill: var(--text-faint);
  font-size: 12px;
}

.chart-svg .chart-line {
  fill: none;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chart-svg .chart-line.is-requests {
  stroke: var(--chart-requests);
}

.chart-svg .chart-line.is-traffic {
  stroke: var(--chart-traffic);
}

.chart-svg .chart-area {
  stroke: none;
}

.chart-svg .ga-stop-top {
  stop-opacity: 0.26;
}

.chart-svg .ga-stop-bottom {
  stop-opacity: 0;
}

.chart-svg .ga-requests .ga-stop-top,
.chart-svg .ga-requests .ga-stop-bottom {
  stop-color: var(--chart-requests);
}

.chart-svg .ga-traffic .ga-stop-top,
.chart-svg .ga-traffic .ga-stop-bottom {
  stop-color: var(--chart-traffic);
}

.chart-svg .chart-hover-line {
  stroke: var(--border-strong);
  stroke-dasharray: 4 4;
  stroke-width: 1;
}

.chart-svg .chart-hover-dot {
  stroke: var(--surface);
  stroke-width: 2;
}

.chart-svg .chart-hover-dot.is-requests {
  fill: var(--chart-requests);
}

.chart-svg .chart-hover-dot.is-traffic {
  fill: var(--chart-traffic);
}

/* ========== 悬浮提示 ========== */
.chart-tooltip {
  position: absolute;
  z-index: 6;
  top: 10px;
  min-width: 164px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow-md);
  font-size: 12.5px;
  pointer-events: none;
}

.chart-tooltip .tt-time {
  margin-bottom: 6px;
  color: var(--text-faint);
}

.chart-tooltip .tt-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  line-height: 1.9;
}

.chart-tooltip .tt-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

.chart-tooltip .tt-label i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.chart-tooltip .tt-label.is-requests i {
  background: var(--chart-requests);
}

.chart-tooltip .tt-label.is-traffic i {
  background: var(--chart-traffic);
}

.chart-tooltip .tt-value {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* ========== 脚注 ========== */
.chart-foot {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  color: var(--text-faint);
  font-size: 12.5px;
}

/* ========== 响应式 ========== */
@media (max-width: 960px) {
  .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .stat-grid {
    grid-template-columns: 1fr;
  }

  .stat-value {
    font-size: 26px;
  }

  .chart-head-right {
    width: 100%;
    justify-content: space-between;
  }
}