:root {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --border: #e2e8f0;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font); background: var(--bg); color: var(--text-main); line-height: 1.6; }
.header { background: #ffffff; border-bottom: 1px solid var(--border); padding: 1rem 2rem; position: sticky; top: 0; z-index: 100; }
.header-container { max-width: 1100px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.25rem; font-weight: 700; color: var(--primary); text-decoration: none; }
.nav a { margin-left: 1.5rem; text-decoration: none; color: var(--text-muted); font-weight: 500; font-size: 0.95rem; }
.nav a:hover { color: var(--primary); }
.disclaimer-banner { background: #eff6ff; border-left: 4px solid var(--primary); padding: 0.75rem 1.5rem; font-size: 0.85rem; color: #1e3a8a; max-width: 1100px; margin: 1rem auto; border-radius: 4px; }
.container { max-width: 1100px; margin: 2rem auto; padding: 0 1rem; }
.card { background: var(--card-bg); border-radius: 8px; border: 1px solid var(--border); padding: 2rem; margin-bottom: 2rem; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
h1 { font-size: 2.25rem; font-weight: 800; margin-bottom: 1rem; color: #0f172a; line-height: 1.2; }
h2 { font-size: 1.5rem; font-weight: 700; margin: 1.5rem 0 1rem; color: #1e293b; }
h3 { font-size: 1.2rem; font-weight: 600; margin: 1rem 0 0.5rem; color: #334155; }
p { margin-bottom: 1rem; color: var(--text-muted); }
ul, ol { margin-left: 1.5rem; margin-bottom: 1rem; color: var(--text-muted); }
li { margin-bottom: 0.5rem; }
.btn { display: inline-block; background: var(--primary); color: #fff; padding: 0.75rem 1.5rem; border-radius: 6px; font-weight: 600; text-decoration: none; border: none; cursor: pointer; }
.btn:hover { background: var(--primary-hover); }
.btn-secondary { background: #e2e8f0; color: #0f172a; margin-left: 0.5rem; }
.btn-secondary:hover { background: #cbd5e1; }
.badge { display: inline-block; padding: 0.25rem 0.6rem; border-radius: 9999px; font-size: 0.75rem; font-weight: 600; text-transform: uppercase; background: #e0f2fe; color: #0369a1; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; margin: 1.5rem 0; }
.form-group { margin-bottom: 1.25rem; }
label { display: block; font-weight: 600; margin-bottom: 0.5rem; color: #1e293b; }
select, input[type='number'], input[type='text'] { width: 100%; padding: 0.75rem; border: 1px solid var(--border); border-radius: 6px; font-size: 1rem; }
.result-box { background: #f0fdf4; border: 1px solid #bbf7d0; border-radius: 8px; padding: 1.5rem; margin-top: 1.5rem; }
.footer { background: #ffffff; border-top: 1px solid var(--border); padding: 3rem 1rem 2rem; margin-top: 4rem; color: var(--text-muted); font-size: 0.9rem; }
.footer-container { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; }
.footer a { color: var(--text-muted); text-decoration: none; }
.footer a:hover { color: var(--primary); }
.footer-bottom { max-width: 1100px; margin: 2rem auto 0; padding-top: 1rem; border-top: 1px solid var(--border); text-align: center; font-size: 0.8rem; }