:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #dbe2ea;
  --accent: #2563eb;
}

* { box-sizing: border-box; }

html {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

body {
  margin: 0;
  line-height: 1.7;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.hero {
  margin-bottom: 20px;
}

h1, h2 {
  line-height: 1.25;
  margin: 0 0 12px;
}

.subtitle {
  color: var(--muted);
  margin: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  margin: 16px 0;
}

.status {
  border-left: 4px solid var(--accent);
}

.footer {
  margin-top: 24px;
  color: var(--muted);
  font-size: 14px;
}