/* ties.eranova.top — 机器 / frp 拓扑图（跟随系统明暗） */
:root {
  --bg: #ffffff;
  --fg: #16181d;
  --muted: #8a8f98;
  --line: #e6e8eb;
  --grid: rgba(22, 24, 29, 0.055);
  --node: #16181d;
  --node-ring: rgba(22, 24, 29, 0.16);
  --edge: #6b7280;
  --accent: #2f6df6;
  --label-bg: rgba(255, 255, 255, 0.86);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1013;
    --fg: #eceef2;
    --muted: #737a85;
    --line: #22262c;
    --grid: rgba(236, 238, 242, 0.05);
    --node: #eceef2;
    --node-ring: rgba(236, 238, 242, 0.22);
    --edge: #7d8794;
    --accent: #6f9bff;
    --label-bg: rgba(14, 16, 19, 0.82);
  }
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

#canvas {
  display: block;
  position: fixed;
  inset: 0;
  touch-action: none;   /* 让 pointer 事件自己处理手势 */
  cursor: default;
}

/* 左上角标题 */
.bar {
  position: fixed;
  top: 0;
  left: 0;
  padding: 1.15rem 1.4rem;
  pointer-events: none;
}

.bar h1 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* 图形约定：方形 = 有公网 IP，圆形 = NAT 后无公网 */
.legend {
  display: flex;
  gap: 0.85rem;
  margin-top: 0.55rem;
  font-size: 0.7rem;
  color: var(--muted);
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.34rem;
}

.sw {
  display: block;
  width: 8px;
  height: 8px;
  background: var(--node);
}

.sw--sq { border-radius: 1px; }
.sw--ci { border-radius: 50%; }

.bar .dot { color: var(--muted); }

/* 底部提示 */
.hint {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  margin: 0;
  padding: 0.85rem 1.4rem;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--muted);
  pointer-events: none;
}

.hint--error { color: #d64545; }