/* ===== CSS Variables ===== */
:root {
  --primary: #8b5cf6;
  --primary-dark: #7c3aed;
  --primary-light: #ede9fe;
  --success: #34a853;
  --danger: #ea4335;
  --warning: #fbbc04;
  --text: #202124;
  --text-secondary: #5f6368;
  --text-light: #80868b;
  --bg: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --border: #dadce0;
  --shadow: 0 1px 3px rgba(60,64,67,0.12), 0 1px 2px rgba(60,64,67,0.08);
  --shadow-lg: 0 4px 12px rgba(60,64,67,0.15), 0 2px 6px rgba(60,64,67,0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1200px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'SF Mono', 'Consolas', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font); color: var(--text); background: var(--bg-secondary); line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

.site-header { background: var(--bg); border-bottom: 1px solid var(--border); padding: 0 1rem; position: sticky; top: 0; z-index: 100; }
.header-inner { max-width: var(--max-width); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; height: 60px; }
.site-logo { font-size: 1.25rem; font-weight: 700; color: var(--primary); display: flex; align-items: center; gap: 0.5rem; }
.site-logo svg { width: 28px; height: 28px; }
.nav-links { display: flex; gap: 1.5rem; list-style: none; }
.nav-links a { color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; padding: 0.25rem 0; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); text-decoration: none; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.nav-toggle svg { width: 24px; height: 24px; color: var(--text); }

main { flex: 1; max-width: var(--max-width); margin: 0 auto; padding: 2rem 1rem; width: 100%; }

.hero { text-align: center; padding: 3rem 0 2rem; }
.hero h1 { font-size: 2.25rem; font-weight: 700; color: var(--text); margin-bottom: 0.75rem; line-height: 1.2; }
.hero p { font-size: 1.1rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

.calc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.25rem; margin-top: 2rem; }
.calc-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; transition: transform 0.2s, box-shadow 0.2s; display: flex; flex-direction: column; gap: 0.75rem; }
.calc-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); text-decoration: none; }
.calc-card-icon { width: 48px; height: 48px; border-radius: var(--radius-sm); background: var(--primary-light); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; }
.calc-card h3 { font-size: 1.1rem; font-weight: 600; color: var(--text); }
.calc-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5; }

.calc-page { display: grid; grid-template-columns: 1fr; gap: 2rem; }
.calc-page h1 { font-size: 1.75rem; font-weight: 700; margin-bottom: 0.5rem; }
.calc-page .subtitle { color: var(--text-secondary); font-size: 1rem; margin-bottom: 1.5rem; }
.calc-tool { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.75rem; box-shadow: var(--shadow); }

.calc-form { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { display: flex; flex-direction: column; gap: 0.375rem; }
.form-group.full-width { grid-column: 1 / -1; }
.form-group label { font-size: 0.8125rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; }
.form-group input, .form-group select { padding: 0.625rem 0.875rem; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 1rem; font-family: var(--font); color: var(--text); background: var(--bg); transition: border-color 0.2s, box-shadow 0.2s; }
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(139,92,246,0.15); }

.btn-calculate { grid-column: 1 / -1; padding: 0.875rem 2rem; background: var(--primary); color: white; border: none; border-radius: var(--radius-sm); font-size: 1rem; font-weight: 600; cursor: pointer; transition: background 0.2s; margin-top: 0.5rem; }
.btn-calculate:hover { background: var(--primary-dark); }
.btn-calculate:active { transform: scale(0.98); }

.calc-results { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border); display: none; }
.calc-results.visible { display: block; }
.result-highlight { background: var(--primary-light); border-radius: var(--radius-sm); padding: 1.25rem; text-align: center; margin-bottom: 1rem; }
.result-highlight .label { font-size: 0.8125rem; font-weight: 600; color: var(--primary); text-transform: uppercase; letter-spacing: 0.5px; }
.result-highlight .value { font-size: 2rem; font-weight: 700; color: var(--text); margin-top: 0.25rem; }
.result-details { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.result-item { padding: 0.75rem; background: var(--bg-secondary); border-radius: var(--radius-sm); }
.result-item .label { font-size: 0.75rem; color: var(--text-secondary); }
.result-item .value { font-size: 1.125rem; font-weight: 600; color: var(--text); margin-top: 0.125rem; }

.comparison-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1rem; }
.comparison-column { padding: 1rem; background: var(--bg-secondary); border-radius: var(--radius-sm); }
.comparison-column.winner { border: 2px solid var(--success); background: #f0fdf4; }
.comparison-column h4 { font-size: 0.9rem; margin-bottom: 0.5rem; color: var(--text); }
.comparison-column .metric { display: flex; justify-content: space-between; padding: 0.25rem 0; font-size: 0.85rem; }
.comparison-column .metric .val { font-weight: 600; }
.winner-badge { display: inline-block; font-size: 0.7rem; background: var(--success); color: white; padding: 0.15rem 0.5rem; border-radius: 10px; margin-left: 0.5rem; }

.cta-section { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }
.cta-card { background: linear-gradient(135deg, var(--primary-light), #f3e8ff); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; text-align: center; }
.cta-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.cta-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; color: var(--text); }
.cta-card p { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 0.75rem; }
.affiliate-disclosure { font-size: 0.75rem !important; color: var(--text-light) !important; margin-bottom: 1rem !important; }
.cta-button { display: inline-block; padding: 0.625rem 1.5rem; background: var(--primary); color: white; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.9rem; text-decoration: none; transition: background 0.2s; }
.cta-button:hover { background: var(--primary-dark); text-decoration: none; }

.seo-content { margin-top: 2rem; display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.seo-block { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }
.seo-block.full-width { grid-column: 1 / -1; }
.seo-block h2 { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.75rem; color: var(--text); }
.seo-block h3 { font-size: 1rem; font-weight: 600; margin: 1rem 0 0.5rem; color: var(--text); }
.seo-block p, .seo-block li { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }
.seo-block ul { padding-left: 1.25rem; }
.seo-block li { margin-bottom: 0.375rem; }

.breadcrumb { display: flex; align-items: center; gap: 0.5rem; font-size: 0.8125rem; color: var(--text-light); margin-bottom: 1.5rem; }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb span { color: var(--text); font-weight: 500; }

.site-footer { background: var(--bg); border-top: 1px solid var(--border); padding: 2rem 1rem; margin-top: auto; }
.footer-inner { max-width: var(--max-width); margin: 0 auto; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; }
.footer-links { display: flex; gap: 1.5rem; list-style: none; font-size: 0.8125rem; }
.footer-links a { color: var(--text-secondary); }
.cross-site-links { font-size: 0.8rem; color: var(--text-light); display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.cross-site-links span { font-weight: 600; }
.cross-site-links a { color: var(--primary); text-decoration: none; }
.cross-site-links a:hover { text-decoration: underline; }
.footer-copy { font-size: 0.8125rem; color: var(--text-light); }

.legal-page { max-width: 800px; margin: 0 auto; padding: 3rem 1.5rem; }
.legal-page h1 { font-size: 1.75rem; margin-bottom: 2rem; }
.legal-page h2 { font-size: 1.15rem; margin: 2rem 0 0.75rem; color: var(--text); }
.legal-page p, .legal-page ul { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 0.75rem; }
.legal-page ul { padding-left: 1.5rem; }
.legal-page li { margin-bottom: 0.4rem; }
.legal-page a { color: var(--primary); }
.legal-page .last-updated { font-size: 0.8rem; color: var(--text-light); margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--border); }

@media (max-width: 768px) {
  .hero h1 { font-size: 1.75rem; }
  .nav-links { display: none; position: absolute; top: 60px; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); flex-direction: column; padding: 1rem; gap: 0.5rem; z-index: 99; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .calc-form { grid-template-columns: 1fr; }
  .result-details { grid-template-columns: 1fr; }
  .seo-content { grid-template-columns: 1fr; }
  .comparison-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; align-items: center; }
}