.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(248, 250, 252, 0.86);
  border-bottom: 1px solid rgba(219, 228, 238, 0.8);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: 4.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.main-nav {
  display: none;
  align-items: center;
  gap: 1rem;
  color: var(--color-muted);
  font-size: 0.95rem;
  font-weight: 700;
}

.main-nav a:hover,
.main-nav a:focus {
  color: var(--color-primary);
}

.hero {
  padding-top: 3.5rem;
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.14), transparent 32rem),
    linear-gradient(180deg, #ffffff 0%, var(--color-bg) 100%);
}

.hero-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.hero-content h1 {
  margin-bottom: 1rem;
  max-width: 780px;
  font-size: clamp(2.15rem, 9vw, 4.7rem);
}

.hero-text {
  max-width: 680px;
  margin-bottom: 1.25rem;
}

.calculator-grid {
  display: grid;
  gap: 1.25rem;
  align-items: start;
}

.form-row {
  display: grid;
  gap: 1rem;
}

.result-cards,
.info-cards {
  display: grid;
  gap: 0.85rem;
}

.info-grid {
  display: grid;
  gap: 1.5rem;
}

.footer-inner {
  display: grid;
  gap: 0.35rem;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.site-footer {
  padding-block: 2rem;
  background: #ffffff;
  border-top: 1px solid var(--color-border);
}

@media (min-width: 640px) {
  .form-row,
  .result-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .main-nav {
    display: flex;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
  }

  .calculator-grid {
    grid-template-columns: minmax(320px, 0.92fr) minmax(0, 1.08fr);
  }

  .info-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }
}

.hero-actions,
.monetization-grid,
.mini-cards {
  display: grid;
  gap: 0.85rem;
}

.hero-actions {
  max-width: 520px;
  margin-bottom: 1.25rem;
}

.monetization-section {
  background: #ffffff;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 640px) {
  .hero-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mini-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .monetization-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
  }
}