:root {
  --ink: #333;
  --grey: #8c8c8c;
  --line: #e8e8e8;
  --bg: #f5f4f1;
  --accent: #6b4a2b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 32px 24px 64px;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

header {
  max-width: 1180px;
  margin: 0 auto 28px;
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}

header h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
}

header p {
  margin: 0;
  color: var(--grey);
  font-size: 14px;
}

button {
  font-family: inherit;
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .15s, color .15s;
}

button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

#btn-reload {
  margin-left: auto;
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

#btn-reload:hover {
  opacity: .88;
  color: #fff;
}

.card {
  max-width: 1180px;
  margin: 0 auto 28px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .06);
  overflow: hidden;
}

.card-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
}

.card-bar .src {
  font-size: 12px;
  color: var(--grey);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.card-bar button { margin-left: auto; }

.chart { width: 100%; }

.chart-error {
  padding: 40px;
  color: #c0392b;
  font-size: 14px;
  text-align: center;
}