:root {
  --bg: #ffffff;
  --surface: #f8fafc;
  --surface-strong: #eef2ff;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-2: #10b981;
  --border: #e2e8f0;
  --success: #10b981;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
}

:root[data-theme="dark"] {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-strong: #243244;
  --text: #ffffff;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --accent-2: #10b981;
  --border: #334155;
  --success: #10b981;
  --shadow: 0 20px 60px rgba(2, 6, 23, 0.45);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, rgba(37, 99, 235, 0.12), transparent 40%), var(--bg);
  line-height: 1.6;
  transition: background 0.3s ease, color 0.3s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 3px solid rgba(37,99,235,0.3); outline-offset: 2px; }
.container { width: min(1160px, calc(100% - 2rem)); margin: 0 auto; }
.site-shell { min-height: 100vh; }
.topbar {
  position: sticky; top: 0; z-index: 20; backdrop-filter: blur(18px); background: color-mix(in srgb, var(--bg) 80%, transparent); border-bottom: 1px solid var(--border);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; padding: 1rem 0; gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: 0.7rem; font-weight: 700; font-size: 1.05rem; }
.brand-mark { display: inline-grid; place-items: center; width: 2.2rem; height: 2.2rem; border-radius: 0.75rem; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; box-shadow: 0 10px 30px rgba(37, 99, 235, 0.2); }
.main-nav { display: flex; gap: 1.1rem; color: var(--muted); }
.main-nav a:hover, .main-nav a:focus-visible { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 0.75rem; }
.icon-btn, .menu-toggle { display: inline-grid; place-items: center; width: 2.45rem; height: 2.45rem; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); color: var(--text); cursor: pointer; transition: transform 0.3s ease, background 0.3s ease; }
.icon-btn:hover, .menu-toggle:hover { transform: translateY(-1px); }
.theme-toggle i { transition: transform 0.3s ease; }
.theme-toggle.rotated i { transform: rotate(180deg); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; border: 0; border-radius: 999px; padding: 0.85rem 1.2rem; font-weight: 600; cursor: pointer; transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.3s ease; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: white; box-shadow: 0 12px 30px rgba(37, 99, 235, 0.22); }
.btn-secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn-small { padding: 0.7rem 0.95rem; font-size: 0.92rem; }
.hero-section, .page-hero { padding: 5rem 0 3rem; }
.hero-grid, .calculator-layout, .contact-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 2rem; align-items: center; }
.eyebrow { display: inline-block; padding: 0.35rem 0.7rem; border-radius: 999px; background: rgba(37, 99, 235, 0.12); color: var(--accent); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.18em; margin-bottom: 1rem; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 0.8rem; }
h1 { font-size: clamp(2rem, 3vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 2vw, 2.2rem); }
p { color: var(--muted); margin: 0 0 1rem; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1.5rem; }
.hero-highlights { display: flex; flex-wrap: wrap; gap: 1rem; padding: 0; margin: 1.2rem 0 0; list-style: none; color: var(--muted); }
.hero-highlights li { display: inline-flex; align-items: center; gap: 0.4rem; }
.hero-card, .panel, .info-card, .table-card, .blog-card, .faq-list details, .content-page, .sidebar-card { background: var(--surface); border: 1px solid var(--border); border-radius: 1.4rem; box-shadow: var(--shadow); transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease; }
.hero-card { padding: 1.5rem; }
.hero-card-top { display: flex; justify-content: space-between; align-items: center; }
.hero-card h2 { font-size: 2rem; margin-bottom: 0.5rem; }
.mini-label { color: var(--muted); margin-bottom: 0.2rem; text-transform: uppercase; letter-spacing: 0.2em; font-size: 0.72rem; }
.badge { display: inline-flex; align-items: center; padding: 0.35rem 0.7rem; border-radius: 999px; background: rgba(16, 185, 129, 0.14); color: var(--accent-2); font-size: 0.8rem; }
.hero-card-chart { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.75rem; align-items: end; height: 160px; margin: 1.2rem 0; }
.bar { border-radius: 999px 999px 0 0; background: linear-gradient(180deg, var(--accent), var(--accent-2)); min-height: 30px; }
.bar-1 { height: 60%; }
.bar-2 { height: 80%; }
.bar-3 { height: 45%; }
.bar-4 { height: 90%; }
.hero-card-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.8rem; }
.hero-card-grid div { background: color-mix(in srgb, var(--surface) 80%, transparent); padding: 0.8rem; border-radius: 1rem; }
.section { padding: 2rem 0 4rem; }
.alt-section { background: color-mix(in srgb, var(--surface) 70%, transparent); }
.section-heading { margin-bottom: 1.4rem; }
.card-grid { display: grid; gap: 1.2rem; }
.three-up { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.info-card, .panel, .table-card, .blog-card { padding: 1.2rem; }
.info-card:hover, .blog-card:hover, .panel:hover, .table-card:hover { transform: translateY(-3px); box-shadow: 0 24px 70px rgba(37, 99, 235, 0.12); }
.info-card i { font-size: 1.2rem; color: var(--accent); margin-bottom: 0.8rem; }
.link-card:hover { border-color: rgba(37,99,235,0.3); }
.stacked-form { display: grid; gap: 0.9rem; }
label { display: grid; gap: 0.45rem; font-weight: 600; }
input, select, textarea { border: 1px solid var(--border); background: color-mix(in srgb, var(--surface) 80%, transparent); color: var(--text); padding: 0.85rem 0.95rem; border-radius: 0.95rem; font: inherit; }
textarea { resize: vertical; }
.results-panel { display: grid; gap: 1rem; }
.result-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.9rem; }
.result-card, .total-card { background: color-mix(in srgb, var(--surface) 80%, transparent); border: 1px solid var(--border); border-radius: 1rem; padding: 0.95rem; }
.result-card span, .total-card span { display: block; color: var(--muted); margin-bottom: 0.35rem; }
.total-card { display: flex; justify-content: space-between; align-items: center; font-size: 1.1rem; }
.results-header { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.disclaimer-box { margin-top: 1rem; padding: 1rem; border-radius: 1rem; background: color-mix(in srgb, var(--surface) 80%, transparent); color: var(--muted); }
.table-card table { width: 100%; border-collapse: collapse; }
.table-card th, .table-card td { text-align: left; padding: 0.85rem 0.7rem; border-bottom: 1px solid var(--border); }
.blog-grid { display: grid; gap: 1.2rem; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.blog-image { width: 100%; height: 220px; overflow: hidden; border-radius: 18px; background: var(--surface); margin-bottom: 1rem; }
.blog-image img { width: 100%; height: 100%; object-fit: cover; display: block; transition: 0.4s ease; }
.blog-card:hover img { transform: scale(1.08); }
.blog-content h3 { font-size: 1.1rem; }
.blog-meta { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.9rem; margin-top: 0.8rem; }
.faq-list { display: grid; gap: 0.9rem; }
.faq-list details { padding: 1rem 1.1rem; }
.faq-list summary { cursor: pointer; font-weight: 600; }
.contact-list { list-style: none; padding: 0; display: grid; gap: 0.8rem; }
.site-footer { padding: 3rem 0; background: color-mix(in srgb, var(--surface) 70%, transparent); border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 1.5rem; }
.site-footer ul { list-style: none; padding: 0; display: grid; gap: 0.5rem; color: var(--muted); }
.newsletter-form { display: flex; gap: 0.6rem; margin-top: 0.8rem; flex-wrap: wrap; }
.content-page { padding: 1.4rem; }
.sidebar-card { padding: 1.1rem; margin-top: 1rem; }
.menu-toggle { display: none; flex-direction: column; gap: 0.25rem; }
.menu-toggle span { width: 18px; height: 2px; background: var(--text); border-radius: 99px; }
@media (max-width: 900px) {
  .hero-grid, .calculator-layout, .contact-grid, .footer-grid, .three-up, .blog-grid { grid-template-columns: 1fr; }
  .main-nav { display: none; position: absolute; top: 72px; right: 1rem; left: 1rem; flex-direction: column; padding: 1rem; border: 1px solid var(--border); background: var(--surface); border-radius: 1rem; box-shadow: var(--shadow); }
  .main-nav.open { display: flex; }
  .menu-toggle { display: inline-flex; }
}
@media (max-width: 640px) {
  .nav-wrap { flex-wrap: wrap; }
  .results-header { flex-direction: column; align-items: flex-start; }
  .result-grid { grid-template-columns: 1fr; }
  .hero-section, .page-hero { padding-top: 3rem; }
}