:root {
  --bg: #ffffff;
  --bg-alt: #f1f5f9;
  --ink: #0f172a;
  --muted: #64748b;
  --accent: #059669;
  --accent-dark: #047857;
  --card: #ffffff;
  --border: #e2e8f0;
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}
.container.narrow { max-width: 680px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  padding-bottom: 12px;
}
.brand {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
}
.brand-emoji { margin-right: 4px; }
nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-weight: 600;
  font-size: 0.95rem;
}
nav a:hover { color: var(--ink); }
.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 8px 14px;
  border-radius: 999px;
}
.nav-cta:hover { background: var(--accent-dark); }

/* Hero */
.hero {
  background: linear-gradient(135deg, #0f172a 0%, #134e4a 100%);
  color: #fff;
  padding: 72px 0;
  text-align: center;
}
.hero h1 {
  font-size: 2.4rem;
  margin: 0 0 12px;
  line-height: 1.2;
}
.lede {
  font-size: 1.15rem;
  color: #cbd5e1;
  max-width: 560px;
  margin: 0 auto 28px;
}
.hero-ctas { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  font-size: 1rem;
  border: 2px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { border-color: #475569; color: #fff; }
.btn-ghost:hover { border-color: #94a3b8; }
.btn-big { font-size: 1.1rem; padding: 15px 34px; }

/* Sections */
.section { padding: 64px 0; }
.section.alt { background: var(--bg-alt); }
.section h2 { font-size: 1.8rem; margin: 0 0 6px; }
.section-sub { color: var(--muted); margin: 0 0 28px; font-size: 1.05rem; }

/* Calculator card */
.calc-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.06);
}
.fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.field span { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; color: var(--muted); }
.input-wrap {
  display: flex;
  align-items: center;
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 0 12px;
  background: #fff;
}
.input-wrap:focus-within { border-color: var(--accent); }
.input-wrap .prefix, .input-wrap .suffix { color: var(--muted); font-weight: 700; }
.input-wrap input {
  border: none;
  outline: none;
  font-size: 1.15rem;
  font-weight: 700;
  padding: 12px 8px;
  width: 100%;
  color: var(--ink);
  background: transparent;
}

/* Results */
.results { border-top: 2px solid var(--border); padding-top: 8px; }
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 2px;
  border-bottom: 1px dashed var(--border);
  font-size: 1.02rem;
}
.result-row:last-child { border-bottom: none; }
.result-row strong { font-size: 1.15rem; }
.result-row.total strong { color: var(--accent-dark); font-size: 1.5rem; }
.result-row.total { border-bottom: none; }

.fine-print { color: var(--muted); font-size: 0.85rem; margin-top: 16px; }

/* Product card */
.product-card {
  background: var(--card);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: 0 6px 24px rgba(5, 150, 105, 0.12);
  max-width: 640px;
}
.product-card h3 { margin: 0 0 14px; font-size: 1.35rem; }
.checklist { list-style: none; padding: 0; margin: 0 0 24px; }
.checklist li { padding: 6px 0 6px 30px; position: relative; }
.checklist li::before {
  content: "✓";
  position: absolute;
  left: 4px;
  color: var(--accent);
  font-weight: 800;
}

/* FAQ */
details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  margin-bottom: 12px;
}
summary { font-weight: 700; cursor: pointer; }
details p { color: var(--muted); margin: 10px 0 4px; }

/* Tool cards (index -> calculator sub-pages) */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none;
  color: var(--ink);
  display: block;
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.06);
}
.tool-card:hover { border-color: var(--accent); }
.tool-card h3 { margin: 0 0 8px; font-size: 1.15rem; }
.tool-card p { margin: 0 0 12px; color: var(--muted); font-size: 0.95rem; }
.tool-card .go { color: var(--accent-dark); font-weight: 700; }

/* Sub-page hero */
.page-hero {
  background: linear-gradient(135deg, #0f172a 0%, #134e4a 100%);
  color: #fff;
  padding: 48px 0;
}
.page-hero h1 { margin: 0 0 8px; font-size: 2rem; line-height: 1.2; }
.page-hero p { color: #cbd5e1; margin: 0; max-width: 620px; font-size: 1.05rem; }

.back-link {
  display: inline-block;
  margin-bottom: 20px;
  color: var(--muted);
  font-weight: 600;
  text-decoration: none;
}
.back-link:hover { color: var(--ink); }

/* Small CTA band on sub-pages */
.cta-band {
  background: var(--card);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 28px;
  margin-top: 36px;
  text-align: center;
}
.cta-band h2 { font-size: 1.4rem; margin: 0 0 8px; }
.cta-band p { color: var(--muted); margin: 0 0 20px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 36px 0;
  text-align: center;
  color: var(--muted);
}
.site-footer p { margin: 6px 0; }
.site-footer a { color: var(--muted); }

/* Small screens */
@media (max-width: 560px) {
  .hero { padding: 52px 0; }
  .hero h1 { font-size: 1.8rem; }
  .calc-card, .product-card { padding: 20px; }
  nav a:not(.nav-cta) { display: none; }
}