* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--background-main, var(--bg));
  color: var(--text);
  line-height: 1.65;
}

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

a:hover,
a:focus {
  color: var(--accent);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.75rem max((100vw - var(--max-width)) / 2, 1.5rem);
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand a {
  font-family: 'Inter', 'Inter', system-ui, sans-serif;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 1.1rem;
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
}

.header-cta {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
}

main > .page-hero {
  margin-top: 4.5rem;
}

.page-hero {
  background: var(--surface);
  border-radius: var(--radius);
  padding: clamp(2rem, 4vw, 3rem);
  border: 1px solid var(--border);
  box-shadow: var(--shadow, 0 30px 60px color-mix(in srgb, var(--bg) 35%, transparent));
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  align-items: start;
}

.page-hero h1 {
  font-family: 'Inter', 'Inter', sans-serif;
  font-size: clamp(2rem, 3.6vw, 2.8rem);
  margin-bottom: 1.5rem;
}

.page-hero p {
  color: var(--text-muted);
}

.primary-copy > p {
  margin-bottom: 1.2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border 0.2s ease;
}

.button.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: #fff;
  box-shadow: 0 18px 40px color-mix(in srgb, var(--accent) 35%, transparent);
}

.button.primary:hover,
.button.primary:focus {
  transform: translateY(-2px);
  box-shadow: 0 18px 45px color-mix(in srgb, var(--accent) 45%, transparent);
}

.button.secondary {
  background: color-mix(in srgb, var(--text) 4%, transparent);
  border-color: var(--border);
  color: var(--text);
}

.button.secondary:hover,
.button.secondary:focus {
  border-color: color-mix(in srgb, var(--text) 25%, transparent);
  transform: translateY(-1px);
}

.button.ghost {
  background: transparent;
  border: 1px solid color-mix(in srgb, var(--text) 15%, transparent);
  color: var(--text);
}

.support-links {
  margin-top: 1.5rem;
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.audio-panel {
  background: var(--surface-alt);
  border-radius: var(--radius);
  padding: 1.5rem;
  border: 1px solid var(--border);
}

.audio-panel figcaption {
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.audio-panel audio {
  width: 100%;
  margin-bottom: 0.5rem;
}

.detail-section {
  margin-top: 3.5rem;
  background: color-mix(in srgb, var(--surface) 50%, transparent);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: clamp(2rem, 4vw, 3rem);
}

.detail-section h2 {
  font-family: 'Inter', 'Inter', sans-serif;
  margin-top: 0;
  font-size: 1.75rem;
}

.detail-section p {
  color: var(--text-muted);
}

.detail-section ul {
  margin: 1.5rem 0 0;
  padding-left: 1.4rem;
  color: var(--text-muted);
}

.detail-section li + li {
  margin-top: 0.75rem;
}

.page-footer {
  text-align: center;
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
}

.page-footer nav {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin: 1.5rem 0;
}

@media (max-width: 768px) {
  .site-header {
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
  }

  .site-nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .header-cta {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .support-links {
    flex-direction: column;
    gap: 0.5rem;
  }
}

/* Consistent "How it works" grid for secondary pages */
.how-it-works {
  margin-top: 3.5rem;
}

.steps {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.steps article {
  background: color-mix(in srgb, var(--surface) 75%, transparent);
  border-radius: var(--radius);
  padding: 1.5rem;
  border: 1px solid var(--border);
}

.steps h3 {
  margin-top: 0;
  font-size: 1.1rem;
}

.batch-builder-grid {
  margin-top: 3rem;
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.batch-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  box-shadow: 0 14px 30px color-mix(in srgb, var(--bg) 22%, transparent);
}

.batch-card h2 {
  margin-top: 0;
  margin-bottom: 0.65rem;
  font-size: 1.2rem;
  line-height: 1.3;
}

.batch-card p {
  margin: 0;
  color: var(--text-muted);
}

.batch-note {
  margin-top: 1.5rem;
  color: var(--text-muted);
  font-size: 0.98rem;
}