/* 极简样式：你可以随意修改 */
:root {
  --bg: #0f172a;        /* 背景深蓝 */
  --card: #111827;      /* 卡片深灰 */
  --text: #e5e7eb;      /* 文字浅灰 */
  --muted: #94a3b8;     /* 次要文字 */
  --accent: #22d3ee;    /* 主题色（青色） */
}

* { box-sizing: border-box; }

html, body {
  padding: 0;
  margin: 0;
  background: linear-gradient(180deg, #0b1220 0%, var(--bg) 100%);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Noto Sans, Helvetica, Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft Yahei', sans-serif;
  line-height: 1.6;
}

.container {
  max-width: 980px;
  padding: 24px;
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid #1f2937;
  background: radial-gradient(1200px 400px at 20% -10%, rgba(34,211,238,0.25), transparent 60%);
}

.site-header h1 {
  margin: 0 0 8px 0;
  font-size: 28px;
  letter-spacing: 0.5px;
}

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

.card {
  background: var(--card);
  border: 1px solid #1f2937;
  border-radius: 16px;
  padding: 20px 20px;
  margin: 20px 0;
  box-shadow: 0 10px 20px rgba(0,0,0,0.25);
}

.card h2 {
  margin-top: 0;
  font-size: 20px;
  color: var(--accent);
}

code {
  background: rgba(15,23,42,0.6);
  border: 1px solid #1f2937;
  border-radius: 6px;
  padding: 1px 6px;
  color: #eab308;
}

.site-footer {
  border-top: 1px solid #1f2937;
  color: var(--muted);
  text-align: center;
  padding: 24px 0 40px;
  margin-top: 24px;
}