:root {
  --brand-green-dark: #0a4a30;
  --brand-green: #0d6b41;
  --brand-gold: #f0b429;
  --brand-gold-dark: #d69a1a;
  --brand-white: #ffffff;
  --bg-page: #f4f6f9;
  --card-bg: #ffffff;
  --text: #1e2530;
  --muted: #6b7280;
  --border: #e2e5ea;
}

* { box-sizing: border-box; }

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

a { text-decoration: none; color: inherit; }

/* Header */
.site-header {
  background: var(--brand-green-dark);
  background: linear-gradient(135deg, var(--brand-green-dark), var(--brand-green));
  padding: 18px 24px;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.logo {
  display: inline-flex;
  align-items: center;
}

.logo-img {
  display: block;
  height: 56px;
  width: auto;
  border-radius: 8px;
}

.back-link {
  color: var(--brand-gold);
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: opacity 0.15s ease;
}

.back-link:hover { opacity: 0.8; }

/* Hero (home page) */
.hero {
  text-align: center;
  padding: 40px 24px 24px;
  max-width: 700px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 1.6rem;
  margin: 0 0 8px;
  color: var(--text);
}

.hero p {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0;
}

/* Calculator card grid (home page) */
.card-grid {
  max-width: 960px;
  margin: 24px auto 60px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.calc-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.05);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

a.calc-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.09);
  border-color: var(--brand-gold);
}

.calc-card .icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: #eef8f2;
  color: var(--brand-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
}

.calc-card h2 {
  font-size: 1.05rem;
  margin: 0;
}

.calc-card p {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.4;
}

.calc-card .tag {
  margin-top: auto;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand-green);
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 24px;
  color: var(--muted);
  font-size: 0.78rem;
}