:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --border: #e4e6eb;
  --text: #1c1e21;
  --text-dim: #65676b;
  --accent: #3b82f6;
  --ok: #22c55e;
  --warn: #f59e0b;
  --bad: #ef4444;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(0, 0, 0, .06);

  /* 图表用色。取自已校验的分类调色板（浅色档）：blue / orange / aqua。
     三槽在 all-pairs 下通过 CVD ΔE 9.2、常视 ΔE 24.0；aqua 在浅色面上
     对比度 2.74:1 低于 3:1，因此图表一律附直接末端标签作为补充编码。 */
  --surface-1: #ffffff;
  --series-1: #2a78d6;
  --series-2: #eb6834;
  --series-3: #1baf7a;
  --grid-line: #e4e6eb;
}

[data-theme="dark"] {
  --bg: #17181c;
  --card: #1f2126;
  --border: #2e3138;
  --text: #e7e9ea;
  --text-dim: #9aa0a6;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3);

  /* 深色档是同样三个色相为深色面重新取阶，而非简单反转。 */
  --surface-1: #1f2126;
  --series-1: #3987e5;
  --series-2: #d95926;
  --series-3: #199e70;
  --grid-line: #2e3138;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px 48px; }

/* --- 顶栏 --- */
header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--card) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.head-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand { font-size: 17px; font-weight: 600; cursor: pointer; }
.brand small { display: block; font-size: 12px; font-weight: 400; color: var(--text-dim); }
.spacer { flex: 1; }

.stat-pill {
  display: flex;
  gap: 14px;
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
}
.stat-pill b { color: var(--text); font-weight: 600; }

/* --- 按钮与表单 --- */
button, .btn {
  font: inherit;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
button:hover, .btn:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { filter: brightness(1.08); }
button.danger { color: var(--bad); }
button:disabled { opacity: .5; cursor: not-allowed; }

input, select {
  font: inherit;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg);
  color: var(--text);
  width: 100%;
}
input:focus, select:focus { outline: 2px solid color-mix(in srgb, var(--accent) 40%, transparent); outline-offset: -1px; }

label { display: block; font-size: 12px; color: var(--text-dim); margin: 10px 0 4px; }

/* --- 节点卡片 --- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 14px;
}
.home-toolbar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
}
.home-toolbar button { padding: 4px 10px; font-size: 12px; }
.grid.layout-compact { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px; }
.grid.layout-compact .node { padding: 11px; }
.grid.layout-compact .meta { display: none; }
.grid.layout-compact .kv { display: none; }
.grid.layout-compact .node-head { margin-bottom: 7px; }
.grid.layout-list { grid-template-columns: 1fr; }
.grid.layout-list .node {
  display: grid;
  grid-template-columns: minmax(180px, 1.2fr) minmax(360px, 2fr) minmax(280px, 1.5fr);
  gap: 8px 18px;
  align-items: center;
}
.grid.layout-list .node-head { margin: 0; }
.grid.layout-list .meta { margin: 0; }
.grid.layout-list .bar-row { grid-column: 2; margin: 2px 0; }
.grid.layout-list .kv { grid-column: 3; grid-row: 1 / span 4; margin: 0; }

/* --- 延迟探测 --- */
.ping-intro { display: flex; gap: 10px; margin-bottom: 12px; align-items: baseline; }
.ping-intro b { flex-shrink: 0; }
.ping-intro span { color: var(--text-dim); font-size: 12px; }
.ping-toolbar { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.ping-toolbar button { padding: 4px 10px; font-size: 12px; }
.ping-toolbar button:last-child { margin-left: auto; }
.ping-section { margin-bottom: 18px; }
.ping-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 8px;
  margin-bottom: 8px;
}
.ping-stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 11px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2px 10px;
}
.ping-stat b { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ping-stat strong { color: var(--accent); font-variant-numeric: tabular-nums; }
.ping-stat span { grid-column: 1 / -1; color: var(--text-dim); font-size: 11px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
}

.node { cursor: pointer; transition: transform .12s, border-color .12s; }
.node:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); }
.node.offline { opacity: .62; }

.node-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.node-name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--bad); flex-shrink: 0; }
.dot.on { background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 22%, transparent); }

.tag {
  font-size: 11px;
  padding: 1px 7px;
  border-radius: 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-dim);
  white-space: nowrap;
}

.meta { font-size: 12px; color: var(--text-dim); margin-bottom: 10px; display: flex; flex-wrap: wrap; gap: 4px 10px; }

/* 进度条 */
.bar-row { display: flex; align-items: center; gap: 8px; margin: 6px 0; font-size: 12px; }
.bar-row .k { width: 42px; color: var(--text-dim); flex-shrink: 0; }
.bar { flex: 1; height: 6px; background: var(--bg); border-radius: 4px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--ok); border-radius: 4px; transition: width .4s ease, background .4s; }
.bar-row .v { width: 96px; text-align: right; color: var(--text-dim); font-variant-numeric: tabular-nums; flex-shrink: 0; }

.kv { display: grid; grid-template-columns: repeat(2, 1fr); gap: 4px 12px; font-size: 12px; color: var(--text-dim); margin-top: 10px; }
.kv span { display: flex; justify-content: space-between; gap: 6px; }
.kv b { color: var(--text); font-weight: 500; font-variant-numeric: tabular-nums; }

/* --- 表格 --- */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { padding: 9px 10px; text-align: left; border-bottom: 1px solid var(--border); }
th { font-size: 12px; color: var(--text-dim); font-weight: 500; }
td.actions { text-align: right; white-space: nowrap; }
td.actions button { padding: 3px 8px; font-size: 12px; }
code.token { font-size: 12px; background: var(--bg); padding: 2px 6px; border-radius: 4px; word-break: break-all; }

/* --- 图表 --- */
.chart-card { margin-bottom: 14px; position: relative; }
.chart-title { font-size: 13px; font-weight: 600; margin-bottom: 6px; display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.chart-title span { font-weight: 400; color: var(--text-dim); font-size: 12px; }

/* 图例：两条及以上序列必须存在，标识不依赖颜色本身。 */
.legend { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 12px; color: var(--text-dim); margin-bottom: 4px; }
.legend i { display: inline-block; width: 14px; height: 2px; border-radius: 1px; margin-right: 5px; vertical-align: middle; }

svg.chart { width: 100%; height: 150px; display: block; overflow: visible; touch-action: none; }
svg.chart .grid-line { stroke: var(--grid-line); stroke-width: 1; }
svg.chart .axis-text { fill: var(--text-dim); font-size: 10px; }
/* 数据线固定 2px、圆头圆角；末端标记 r=4 并带 2px 面色描边环。 */
svg.chart .series-line { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
svg.chart .series-area { stroke: none; opacity: .1; }
svg.chart .end-dot { stroke: var(--surface-1); stroke-width: 2; }
svg.chart .end-label { font-size: 10px; font-weight: 600; fill: var(--text); }
svg.chart .crosshair { stroke: var(--text-dim); stroke-width: 1; opacity: .5; }
svg.chart .hover-dot { stroke: var(--surface-1); stroke-width: 2; }

/* 悬浮读数：数值为主、序列名为辅。 */
.tip {
  position: absolute;
  pointer-events: none;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, .14);
  padding: 7px 10px;
  font-size: 12px;
  z-index: 10;
  min-width: 120px;
  opacity: 0;
  transition: opacity .1s;
}
.tip.show { opacity: 1; }
.tip .tip-x { color: var(--text-dim); margin-bottom: 4px; font-size: 11px; }
.tip .tip-row { display: flex; align-items: center; gap: 6px; justify-content: space-between; }
.tip .tip-row i { display: inline-block; width: 12px; height: 2px; border-radius: 1px; flex-shrink: 0; }
.tip .tip-row .n { color: var(--text-dim); flex: 1; }
.tip .tip-row .v { font-weight: 600; font-variant-numeric: tabular-nums; }

/* 数据表视图：确保任何数值都不依赖悬浮才可读。 */
.table-toggle { font-size: 12px; padding: 3px 9px; }
.data-table { max-height: 240px; overflow: auto; margin-top: 10px; }
.data-table table { font-size: 12px; }
.data-table td { font-variant-numeric: tabular-nums; }

/* --- 弹窗 --- */
.mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 50;
}
.modal {
  background: var(--card);
  border-radius: 12px;
  padding: 20px;
  width: 100%;
  max-width: 460px;
  max-height: 88vh;
  overflow: auto;
}
.modal h3 { margin: 0 0 12px; font-size: 16px; }
.modal-foot { display: flex; gap: 8px; justify-content: flex-end; margin-top: 18px; }

.err { color: var(--bad); font-size: 12px; margin-top: 8px; min-height: 16px; }
.hint { color: var(--text-dim); font-size: 12px; }
.empty { text-align: center; padding: 56px 16px; color: var(--text-dim); }

.tabs { display: flex; gap: 4px; margin-bottom: 16px; border-bottom: 1px solid var(--border); }
.tabs button { border: none; background: none; border-radius: 0; border-bottom: 2px solid transparent; padding: 8px 12px; color: var(--text-dim); }
.tabs button.active { color: var(--text); border-bottom-color: var(--accent); font-weight: 500; }

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--card);
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 13px;
  z-index: 100;
}

.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }

@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
  .grid.layout-list .node { display: block; }
  .grid.layout-list .meta { margin-bottom: 10px; }
  .grid.layout-list .kv { margin-top: 10px; }
  .home-toolbar { justify-content: flex-start; }
  .ping-intro { display: block; }
  .ping-toolbar button:last-child { margin-left: 0; }
  .stat-pill { display: none; }
  .row2 { grid-template-columns: 1fr; }
}