:root {
  --color-primary: #1e40af;
  --color-secondary: #1e3a5f;
  --color-accent: #f59e0b;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-warning-bg: #fef3c7;
  --color-warning-border: #f59e0b;
  --color-info-bg: #dbeafe;
  --color-info-border: #3b82f6;
  --color-tip-bg: #d1fae5;
  --color-tip-border: #10b981;
  --color-citation-bg: #f1f5f9;
  --color-citation-border: #94a3b8;
  --font-body: system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, 'Cascadia Code', 'Fira Code', monospace;
  --max-width: 800px;
  --ad-header-height: 90px;
  --ad-sidebar-width: 300px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font-body); color: var(--color-text); background: var(--color-bg); line-height: 1.6; max-width: var(--max-width); margin: 0 auto; padding: 0 1rem; }
h1 { font-size: 1.75rem; line-height: 1.2; margin-bottom: 0.5rem; }
h2 { font-size: 1.375rem; line-height: 1.3; margin: 1.5rem 0 0.75rem; }
h3 { font-size: 1.125rem; line-height: 1.4; margin: 1.25rem 0 0.5rem; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.result-hero { background: var(--color-bg-alt); border: 2px solid var(--color-primary); border-radius: 8px; padding: 1.5rem; margin: 1rem 0; text-align: center; }
.result-hero .value { font-size: 2.5rem; font-weight: 700; color: var(--color-primary); }
.result-hero .unit { font-size: 1.25rem; color: var(--color-text-muted); }
.result-hero .label { font-size: 0.875rem; color: var(--color-text-muted); margin-top: 0.25rem; }

.content-block { border-left: 4px solid; border-radius: 0 6px 6px 0; padding: 0.75rem 1rem; margin: 0.75rem 0; }
.content-block.warning { background: var(--color-warning-bg); border-color: var(--color-warning-border); }
.content-block.info { background: var(--color-info-bg); border-color: var(--color-info-border); }
.content-block.tip { background: var(--color-tip-bg); border-color: var(--color-tip-border); }
.content-block.code-citation { background: var(--color-citation-bg); border-color: var(--color-citation-border); }
.content-block .block-title { font-weight: 600; margin-bottom: 0.25rem; }
.content-block .block-source { font-size: 0.8rem; color: var(--color-text-muted); margin-top: 0.5rem; }

table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.9rem; }
th, td { padding: 0.5rem 0.75rem; border: 1px solid var(--color-border); text-align: left; }
th { background: var(--color-bg-alt); font-weight: 600; }
tr:nth-child(even) { background: var(--color-bg-alt); }

.breadcrumbs { font-size: 0.8rem; color: var(--color-text-muted); margin-bottom: 1rem; }
.breadcrumbs a { color: var(--color-text-muted); }
.breadcrumbs span { margin: 0 0.25rem; }

.calc-form { background: var(--color-bg-alt); border: 1px solid var(--color-border); border-radius: 8px; padding: 1rem; margin: 1rem 0; }
.calc-form label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 0.25rem; }
.calc-form input, .calc-form select { width: 100%; padding: 0.5rem; border: 1px solid var(--color-border); border-radius: 4px; font-size: 1rem; margin-bottom: 0.75rem; }
.calc-form button { background: var(--color-primary); color: white; border: none; padding: 0.5rem 1.5rem; border-radius: 4px; font-size: 1rem; cursor: pointer; }

.related-pages { margin: 1.5rem 0; }
.related-pages h3 { margin-bottom: 0.75rem; }
.related-link { display: block; padding: 0.5rem 0; border-bottom: 1px solid var(--color-border); }
.related-link .reason { font-size: 0.8rem; color: var(--color-text-muted); }

.ad-slot { min-height: var(--ad-header-height); background: var(--color-bg-alt); margin: 1rem 0; }
.ad-slot-header { min-height: 90px; }
.ad-slot-in-content { min-height: 250px; }
.ad-slot-footer { min-height: 90px; }

.site-footer { margin-top: 3rem; padding: 1.5rem 0; border-top: 1px solid var(--color-border); font-size: 0.8rem; color: var(--color-text-muted); }

.disclaimer { background: var(--color-citation-bg); border: 1px solid var(--color-border); border-radius: 4px; padding: 0.75rem; font-size: 0.8rem; color: var(--color-text-muted); margin: 1.5rem 0; }

.formula-block { background: var(--color-bg-alt); border: 1px solid var(--color-border); border-radius: 6px; padding: 1rem; margin: 1rem 0; font-family: var(--font-mono); }
.formula-block .expression { font-size: 1.1rem; margin-bottom: 0.5rem; }
.formula-block .variables { font-size: 0.85rem; }
.formula-block .variables dt { font-weight: 600; }