/* ============================================================
   用户端样式 — 简洁响应式
   ============================================================ */
:root {
  --bg: #fdfcf9;
  --text: #1c1917;
  --text2: #44403c;
  --muted: #a8a29e;
  --accent: #d97706;
  --accent-soft: rgba(217,119,6,.07);
  --border: #e7e5e4;
  --radius: 12px;
  --max-w: 860px;
  --font-body: "Noto Serif SC", Georgia, "Microsoft YaHei", serif;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
}

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(253,252,249,.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto;
  padding: 0 20px; height: 56px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-brand {
  display: flex; align-items: center; gap: 8px;
  font-size: 18px; font-weight: 700; color: var(--text); text-decoration: none;
}
.nav-brand img { width: 30px; height: 30px; border-radius: 6px; }
.nav-links { display: flex; gap: 20px; list-style: none; }
.nav-links a {
  font-family: var(--font-ui); font-size: 14px;
  color: var(--text2); text-decoration: none; font-weight: 500;
}
.nav-links a:hover { color: var(--accent); }

/* Page content */
.page-content {
  max-width: var(--max-w); margin: 0 auto; padding: 40px 20px 80px;
}

/* Typography */
.page-content h1 { font-size: 2.2rem; margin-bottom: 16px; }
.page-content h2 { font-size: 1.7rem; margin: 36px 0 14px; }
.page-content h3 { font-size: 1.3rem; margin: 28px 0 10px; color: var(--text2); }
.page-content p { margin: 14px 0; }
.page-content a { color: var(--accent); }
.page-content img { max-width: 100%; border-radius: var(--radius); }
.page-content pre {
  background: #1c1917; color: #e8d5c4;
  padding: 20px; border-radius: var(--radius); overflow-x: auto;
  font-size: 14px; line-height: 1.6; margin: 20px 0;
}
.page-content blockquote {
  border-left: 3px solid var(--accent); background: var(--accent-soft);
  padding: 16px 20px; margin: 20px 0; border-radius: 0 8px 8px 0;
}
.page-content hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }

/* Buttons */
.btn {
  display: inline-block; padding: 10px 22px; border-radius: 8px;
  font-family: var(--font-ui); font-size: 14px; font-weight: 600;
  text-decoration: none; cursor: pointer; transition: all .2s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { opacity: .9; }
.btn-secondary { background: var(--accent-soft); color: var(--accent); }
.btn-outline { border: 2px solid var(--accent); color: var(--accent); background: transparent; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 14px 30px; font-size: 16px; }

/* Footer */
.site-footer {
  text-align: center; padding: 28px; font-family: var(--font-ui);
  font-size: 13px; color: var(--muted); border-top: 1px solid var(--border);
}

/* Mobile */
@media (max-width: 640px) {
  body { font-size: 15px; }
  .page-content { padding: 24px 16px 60px; }
  .page-content h1 { font-size: 1.6rem; }
  .page-content h2 { font-size: 1.3rem; }
  .nav-inner { padding: 0 14px; }
  .page-content pre { font-size: 13px; padding: 14px; }
}