body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  max-width: 880px;
  margin: 0 auto;
  padding: 32px;
  line-height: 2;
  font-size: 22px;
  color: #eee;
  position: relative;
}
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background: url('/images/bg.jpg') no-repeat center center fixed;
  background-size: cover;
}
[data-theme="light"] body::before {
  filter: brightness(0.7);
}
[data-theme="dark"] body::before {
  filter: brightness(0.4) blur(3px);
}
[data-theme="light"] header,
[data-theme="light"] main,
[data-theme="light"] footer {
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(12px);
  color: #333;
}
[data-theme="dark"] header,
[data-theme="dark"] main,
[data-theme="dark"] footer {
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(12px);
  color: #eee;
}
header {
  border-bottom: 1px solid #eee;
  padding: 28px 24px;
  margin-bottom: 24px;
  border-radius: 12px;
}
[data-theme="dark"] header { border-bottom-color: #444; }
header h1 { margin: 0; font-size: 56px; font-weight: 600; }
header h1 a { color: #333; text-decoration: none; }
[data-theme="dark"] header h1 a { color: #eee; }
nav { margin-top: 12px; display: flex; align-items: center; flex-wrap: wrap; gap: 4px; }
nav a {
  color: #666;
  text-decoration: none;
  font-size: 20px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 6px;
  transition: background 0.15s;
}
[data-theme="dark"] nav a { color: #bbb; }
nav a:hover { background: rgba(128,128,128,0.12); color: #000; }
[data-theme="dark"] nav a:hover { background: rgba(255,255,255,0.1); color: #fff; }
.subtitle {
  margin-top: -8px;
  margin-bottom: 16px;
  font-size: 15px;
  color: #888;
}
[data-theme="dark"] .subtitle { color: #aaa; }
.theme-switch {
  margin-left: auto;
  font-size: 1.2em;
}
.theme-switch span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  cursor: pointer;
  border-radius: 50%;
  transition: background 0.2s, transform 0.2s;
  color: inherit;
}
.theme-switch span:hover { background: rgba(128,128,128,0.2); transform: rotate(15deg); }
main {
  min-height: 60vh;
  padding: 32px;
  border-radius: 12px;
  font-size: 22px;
  line-height: 2;
}
main h2 { font-size: 40px; font-weight: 600; margin-top: 0; }
footer {
  border-top: 1px solid #eee;
  padding-top: 18px;
  margin-top: 30px;
  font-size: 14px;
  color: #999;
  text-align: center;
  padding: 18px 24px;
  border-radius: 12px;
  line-height: 1.7;
}
[data-theme="dark"] footer { border-top-color: #444; color: #aaa; }
article h2 { margin-top: 0; }
time { color: #999; font-size: 14px; }
[data-theme="dark"] time { color: #bbb; }
a { color: #2563eb; }
[data-theme="dark"] a { color: #6ea8fe; }
ul { padding-left: 24px; }
li { margin-bottom: 10px; }