/* =========================================================
   Material 3 overlay — loaded AFTER each page's own CSS so
   that hero, cards, badges, and step numbers across every
   page get a consistent Material You polish without
   touching the per-page layout files.
   ========================================================= */

/* ---------- Hero (Material You tonal surface) ---------- */
.hero-section {
  background:
    radial-gradient(ellipse at 20% 0%, color-mix(in srgb, var(--md-primary-container) 90%, transparent), transparent 60%),
    radial-gradient(ellipse at 80% 100%, color-mix(in srgb, var(--md-tertiary-container) 70%, transparent), transparent 55%),
    var(--md-surface-container-low);
  color: var(--md-on-surface);
  padding: 5.5rem 0 4.5rem;
  text-align: center;
  border-bottom: 1px solid var(--md-outline-variant);
}

.hero-section h1 {
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-weight: 500;
  font-size: clamp(2.25rem, 4vw + 1rem, 3.25rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  color: var(--md-on-surface);
  text-shadow: none;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-icon { width: 56px; height: 56px; }

.hero-subtitle {
  font-size: clamp(1.0625rem, 1.2vw + 0.75rem, 1.25rem);
  font-weight: 500;
  color: var(--md-on-surface);
  opacity: 1;
  margin-bottom: 0.75rem;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.hero-description {
  font-size: 1rem;
  color: var(--md-on-surface-variant);
  opacity: 1;
  margin-bottom: 2rem;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* In hero, primary stays filled with brand color, secondary becomes tonal */
.hero-section .btn-primary {
  background-color: var(--md-primary);
  color: var(--md-on-primary);
  border-color: var(--md-primary);
}
.hero-section .btn-primary:hover {
  background-color: color-mix(in srgb, var(--md-primary) 92%, #000 8%);
  color: var(--md-on-primary);
}
.hero-section .btn-secondary {
  background-color: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-color: transparent;
}
.hero-section .btn-secondary:hover {
  background-color: color-mix(in srgb, var(--md-secondary-container) 88%, var(--md-on-secondary-container) 12%);
  color: var(--md-on-secondary-container);
  border-color: transparent;
}

/* ---------- Section backgrounds use tonal surfaces ---------- */
.features-section,
.quickstart-section,
.about-project {
  background-color: var(--md-surface-container-low);
}

/* ---------- Cards (M3 filled / outlined) ---------- */
.feature-card,
.format-item,
.doc-link,
.doc-category,
.gallery-card,
.stat-item,
.evolution-step,
.download-card {
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-lg);
  box-shadow: none;
  transition: background-color var(--md-duration-short) var(--md-easing-standard),
              border-color var(--md-duration-short) var(--md-easing-standard),
              box-shadow var(--md-duration-short) var(--md-easing-standard),
              transform var(--md-duration-short) var(--md-easing-standard);
}

.feature-card:hover,
.format-item:hover,
.doc-link:hover,
.doc-category:hover,
.gallery-card:hover,
.download-card:hover {
  background: var(--md-surface-container);
  border-color: var(--md-outline);
  box-shadow: var(--md-elevation-2);
  transform: translateY(-2px);
}

.feature-card { padding: 1.75rem; }

.feature-icon {
  font-size: 2rem;
  width: 56px;
  height: 56px;
  border-radius: var(--md-shape-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  margin: 0 auto 1.25rem;
}

.feature-card h3 {
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--md-on-surface);
  letter-spacing: -0.01em;
}

.feature-card p {
  color: var(--md-on-surface-variant);
  font-size: 0.9375rem;
  line-height: 1.55;
}

/* ---------- Format chips ---------- */
.format-item {
  padding: 1rem 1.25rem;
  gap: 0.875rem;
}
.format-status {
  width: 36px;
  height: 36px;
  font-size: 1.125rem;
  border-radius: var(--md-shape-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--md-tertiary-container);
  color: var(--md-on-tertiary-container);
}
.format-item.supported .format-status {
  background: color-mix(in srgb, var(--md-success) 22%, transparent);
  color: var(--md-success);
}
.format-info h4 {
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.125rem;
  color: var(--md-on-surface);
}
.format-info p {
  color: var(--md-on-surface-variant);
  font-size: 0.875rem;
}

/* ---------- Step numbers (M3 FAB-style circle) ---------- */
.step-number {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  width: 56px;
  height: 56px;
  border-radius: var(--md-shape-lg);
  font-family: 'Google Sans', 'Roboto', sans-serif;
  box-shadow: none;
}

.step-item h3 {
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--md-on-surface);
}
.step-item p { color: var(--md-on-surface-variant); font-size: 0.9375rem; }

/* ---------- Doc links ---------- */
.doc-link { padding: 1.125rem 1.25rem; border-radius: var(--md-shape-md); }
.doc-icon {
  width: 44px; height: 44px;
  border-radius: var(--md-shape-md);
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  font-size: 1.4rem;
  margin-right: 1rem;
}
.doc-content h3 {
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--md-on-surface);
}
.doc-content p { color: var(--md-on-surface-variant); }

/* ---------- Gallery ---------- */
.category-btn {
  background: var(--md-surface-container);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-full);
  padding: 0 1rem;
  height: 36px;
  color: var(--md-on-surface-variant);
  font-weight: 500;
  font-size: 0.875rem;
  display: inline-flex; align-items: center;
}
.category-btn:hover {
  background: color-mix(in srgb, var(--md-primary) 10%, transparent);
  border-color: var(--md-outline);
  color: var(--md-on-surface);
}
.category-btn.active {
  background: var(--md-secondary-container);
  border-color: transparent;
  color: var(--md-on-secondary-container);
}

/* ---------- Download cards (highlight primary version) ---------- */
.download-card.primary {
  border-color: var(--md-primary);
  border-width: 2px;
  background: var(--md-surface-container-lowest);
}
.version-info {
  background: color-mix(in srgb, var(--md-primary) 10%, transparent);
  color: var(--md-on-surface);
  padding: 0.5rem 1rem;
  border-radius: var(--md-shape-full);
  font-weight: 500;
  font-size: 0.875rem;
  display: inline-flex; gap: 0.75rem; align-items: center;
}

/* ---------- Material Symbols (sprite) ----------
   All icons live in /assets/icons/material/sprite.svg as <symbol> defs.
   They use fill="currentColor" so they adapt to dark/light themes.
*/
.m-icon {
  width: 1.25em;
  height: 1.25em;
  display: inline-block;
  vertical-align: -0.225em;
  fill: currentColor;
  color: currentColor;
  flex-shrink: 0;
  pointer-events: none;
}

/* Larger icon sizes for badges / chips */
.feature-icon .m-icon { width: 28px; height: 28px; }
.format-status .m-icon,
.doc-icon .m-icon       { width: 22px; height: 22px; }
.step-number .m-icon    { width: 28px; height: 28px; }
.hero-icon.m-icon       { width: 56px; height: 56px; }

/* In the M3 top app bar logo, brand icon stays its image */
.theme-toggle .m-icon { width: 22px; height: 22px; }

/* Inside hero h1, give the inline icon a nicer baseline */
.hero-section h1 .m-icon { vertical-align: -0.15em; }

/* Arrow icons inside links — keep aligned with text */
.releases-link .m-icon { width: 1em; height: 1em; vertical-align: -0.15em; }

/* Small inline arrow icons (e.g. gallery conversion labels, breadcrumbs) */
small .m-icon,
.breadcrumb .m-icon { width: 0.9em; height: 0.9em; vertical-align: -0.1em; opacity: 0.7; }

/* Inline-status icons in headings — use semantic color */
.format-item.supported .format-status .m-icon { color: var(--md-success); }
.format-item.partial   .format-status .m-icon { color: var(--md-warning); }

/* ---------- Tooltip-friendly focus ring everywhere ---------- */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--md-primary);
  outline-offset: 2px;
  border-radius: var(--md-shape-xs);
}

/* ---------- Section spacing tightens on small screens ---------- */
@media (max-width: 600px) {
  section { padding: 3rem 0; }
  .hero-section { padding: 3.5rem 0 3rem; }
  .feature-icon { width: 48px; height: 48px; font-size: 1.6rem; }
}