:root {
  color-scheme: dark;
  --bg: #15171f;
  --panel: #20232e;
  --panel-soft: #292d3a;
  --text: #eef2f6;
  --muted: #9aa4b2;
  --accent: #2dd4bf;
  --danger: #fb7185;
  --border: #343947;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

main {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
}

label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
}

select,
button {
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
}

select {
  padding: 0 8px;
}

button {
  min-width: 88px;
  padding: 0 12px;
  cursor: pointer;
}

button.primary {
  border-color: transparent;
  background: var(--accent);
  color: #06201c;
  font-weight: 700;
}

button.danger {
  border-color: transparent;
  background: var(--danger);
  color: #2a080e;
  font-weight: 700;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.status {
  min-height: 32px;
  display: flex;
  align-items: center;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.35;
}

.status.ok {
  color: var(--accent);
}

.status.error {
  color: var(--danger);
}

.chart-container {
  min-height: 0;
  flex: 1;
  position: relative;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-soft);
  padding: 8px;
}