:root { --teal: #0d9488; --teal-dark: #0f766e; --teal-light: #f0fdfa; --gray-50: #f8fafc; --gray-100: #f1f5f9; --gray-200: #e2e8f0; --gray-500: #64748b; --gray-700: #334155; --gray-900: #1e293b; }
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', Arial, sans-serif; color: var(--gray-700); line-height: 1.7; max-width: 960px; margin: 0 auto; padding: 24px 32px; background: #fff; }
h1 { color: var(--teal-dark); font-size: 26px; border-bottom: 3px solid var(--teal); padding-bottom: 8px; margin-bottom: 20px; }
h2 { color: var(--gray-900); font-size: 20px; margin-top: 32px; margin-bottom: 12px; border-left: 4px solid var(--teal); padding-left: 12px; }
h3 { color: var(--gray-900); font-size: 16px; margin-top: 24px; margin-bottom: 8px; }
p { margin-bottom: 12px; }
ul, ol { margin: 8px 0 12px 24px; }
li { margin-bottom: 4px; }
code { background: var(--gray-100); padding: 2px 6px; border-radius: 3px; font-size: 13px; }
pre { background: var(--gray-100); padding: 16px; border-radius: 6px; overflow-x: auto; font-size: 13px; margin: 12px 0; border: 1px solid var(--gray-200); }
table { border-collapse: collapse; width: 100%; margin: 12px 0; }
th, td { border: 1px solid var(--gray-200); padding: 8px 12px; text-align: left; font-size: 13px; }
th { background: var(--gray-100); font-weight: 600; }
.note { background: var(--teal-light); border-left: 4px solid var(--teal); padding: 12px 16px; margin: 16px 0; border-radius: 0 6px 6px 0; }
.warning { background: #fef3c7; border-left: 4px solid #f59e0b; padding: 12px 16px; margin: 16px 0; border-radius: 0 6px 6px 0; }
a { color: var(--teal-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
.breadcrumb { font-size: 12px; color: var(--gray-500); margin-bottom: 16px; }
.breadcrumb a { color: var(--gray-500); }
nav.sidebar { position: fixed; left: 0; top: 0; width: 240px; height: 100vh; background: var(--gray-50); border-right: 1px solid var(--gray-200); padding: 16px; overflow-y: auto; }
nav.sidebar a { display: block; padding: 4px 8px; font-size: 13px; color: var(--gray-700); border-radius: 4px; margin: 1px 0; }
nav.sidebar a:hover { background: var(--gray-200); text-decoration: none; }
nav.sidebar .section { font-weight: 600; font-size: 12px; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.5px; margin-top: 16px; margin-bottom: 4px; padding: 0 8px; }
.formula { background: var(--gray-100); padding: 12px; text-align: center; font-family: 'Cambria Math', serif; font-size: 15px; margin: 12px 0; border-radius: 4px; }
img { max-width: 100%; border: 1px solid var(--gray-200); border-radius: 4px; margin: 8px 0; }
.site-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #0d9488;
  color: #fff;
  padding: 8px 20px;
  font-size: 13px;
  margin: -20px -20px 20px -20px;
}
.site-banner a {
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,0.6);
  padding: 3px 10px;
  border-radius: 3px;
  white-space: nowrap;
}
.site-banner a:hover {
  background: rgba(255,255,255,0.15);
}