/* ==========================================================================
   SMToolsAI, home.css
   Homepage-only sections: hero, category cards, the full 100-tool index
   (multi-column on desktop, accordion on mobile), feature cards, the
   three-step explainer, popular tools, the SEO article block and the CTA band.
   Also used by all-tools.html for the shared directory styles.
   Load AFTER main.css.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. HERO
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: var(--sp-16) var(--sp-12);
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
      circle at 20% 0%,
      rgba(99, 102, 241, 0.14),
      transparent 45%
    ),
    radial-gradient(circle at 85% 10%, rgba(139, 92, 246, 0.14), transparent 45%);
  pointer-events: none;
}

.hero > * {
  position: relative;
}

.hero h1 {
  max-width: 18ch;
  margin-inline: auto;
  margin-bottom: var(--sp-4);
}

.hero-sub {
  max-width: 62ch;
  margin: 0 auto var(--sp-8);
  font-size: var(--fs-lg);
  color: var(--text-muted);
  line-height: var(--lh-content);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--sp-2) var(--sp-6);
  margin-top: var(--sp-6);
  padding: 0;
  list-style: none;
  font-size: var(--fs-sm);
  color: var(--text-muted);
}

.hero-stats li {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.hero-stats li::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}

/* --------------------------------------------------------------------------
   2. CATEGORY CARDS
   -------------------------------------------------------------------------- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--sp-4);
  margin-top: var(--sp-12);
  text-align: left;
}

.category-card {
  display: block;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  color: var(--text);
  transition: transform var(--speed) var(--ease),
    border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.category-card:hover {
  text-decoration: none;
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.category-card h3 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  font-size: var(--fs-lg);
  margin-bottom: var(--sp-2);
}

.category-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

.category-card .badge {
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
  white-space: nowrap;
}

[data-theme="dark"] .category-card .badge {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   3. THE 100-TOOL INDEX
   -------------------------------------------------------------------------- */
.tool-index {
  display: grid;
  gap: var(--sp-8);
}

.tool-group {
  scroll-margin-top: calc(var(--header-h) + var(--sp-6));
}

.tool-group > h3 {
  margin: 0;
}

.tool-group-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  width: 100%;
  text-align: left;
  padding: var(--sp-3) 0;
  margin-bottom: var(--sp-4);
  border: 0;
  border-bottom: 2px solid var(--border);
  background: none;
  color: var(--text);
  font-family: inherit;
  font-size: var(--fs-xl);
  font-weight: 700;
  line-height: var(--lh-tight);
  cursor: default;
}

.tool-group-head .chev {
  display: none;
  width: 20px;
  height: 20px;
  flex: none;
  stroke: var(--text-muted);
  fill: none;
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform var(--speed) var(--ease);
}

.tool-group-head .badge {
  font-size: var(--fs-xs);
  background: var(--accent-soft);
  color: var(--accent-strong);
  margin-left: auto;
}

[data-theme="dark"] .tool-group-head .badge {
  color: var(--accent);
}

.tool-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--sp-2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.tool-links a {
  display: block;
  padding: var(--sp-3);
  border-radius: var(--r-md);
  border: 1px solid transparent;
  color: var(--text);
  transition: background-color var(--speed) var(--ease),
    border-color var(--speed) var(--ease);
}

.tool-links a:hover,
.tool-links a:focus-visible {
  text-decoration: none;
  background: var(--surface-1);
  border-color: var(--border);
}

.tool-links strong {
  display: block;
  font-size: var(--fs-base);
  font-weight: 600;
}

.tool-links span {
  display: block;
  font-size: var(--fs-xs);
  color: var(--text-muted);
  margin-top: 2px;
}

/* --------------------------------------------------------------------------
   4. FEATURES, STEPS, POPULAR
   -------------------------------------------------------------------------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--sp-4);
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--sp-6);
  counter-reset: hstep;
  list-style: none;
  margin: 0;
  padding: 0;
}

.step-grid li {
  counter-increment: hstep;
  text-align: center;
  padding: var(--sp-4);
}

.step-grid li::before {
  content: counter(hstep);
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  margin: 0 auto var(--sp-4);
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-size: var(--fs-xl);
  font-weight: 800;
}

.step-grid h3 {
  font-size: var(--fs-lg);
  margin-bottom: var(--sp-2);
}

.step-grid p {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--fs-sm);
  line-height: var(--lh-content);
}

.popular-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--sp-4);
}

.popular-card {
  display: block;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  color: var(--text);
  transition: transform var(--speed) var(--ease),
    border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.popular-card:hover {
  text-decoration: none;
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.popular-card strong {
  display: block;
  font-size: var(--fs-lg);
  margin-bottom: var(--sp-2);
}

.popular-card span {
  display: block;
  font-size: var(--fs-sm);
  color: var(--text-muted);
  line-height: var(--lh-normal);
}

/* --------------------------------------------------------------------------
   5. SEO ARTICLE BLOCK
   -------------------------------------------------------------------------- */
.seo-block {
  background: var(--surface-1);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.seo-block .content-body {
  max-width: 780px;
  margin-inline: auto;
  line-height: var(--lh-content);
}

.seo-block h2 {
  font-size: var(--fs-2xl);
  margin-top: var(--sp-12);
}

.seo-block h2:first-child {
  margin-top: 0;
}

.seo-block h3 {
  font-size: var(--fs-xl);
  margin-top: var(--sp-8);
}

.seo-block ul {
  padding-left: var(--sp-6);
}

.seo-block li {
  margin-bottom: var(--sp-2);
}

/* --------------------------------------------------------------------------
   6. CTA BAND
   -------------------------------------------------------------------------- */
.cta-band {
  margin-block: var(--sp-16) 0;
  padding-block: var(--sp-16);
  background: var(--gradient);
  color: #fff;
  text-align: center;
}

.cta-band h2 {
  color: #fff;
  max-width: 20ch;
  margin-inline: auto;
}

.cta-band p {
  max-width: 60ch;
  margin: 0 auto var(--sp-8);
  font-size: var(--fs-lg);
  color: rgba(255, 255, 255, 0.9);
}

.cta-band .btn-primary {
  background: #fff;
  color: var(--accent-strong);
}

.cta-band .btn-primary:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
}

.cta-band .btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.6);
}

.cta-band .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.14);
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  justify-content: center;
}

.site-footer + .cta-band,
.cta-band + .site-footer {
  margin-top: 0;
}

/* --------------------------------------------------------------------------
   7. RESPONSIVE, mobile turns each category into an accordion
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .hero {
    padding-block: var(--sp-12) var(--sp-8);
  }

  .hero h1 {
    max-width: none;
  }

  .category-grid {
    margin-top: var(--sp-8);
  }

  .tool-index {
    gap: var(--sp-3);
  }

  .tool-group {
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    background: var(--surface-1);
    padding: 0 var(--sp-4);
  }

  .tool-group-head {
    cursor: pointer;
    font-size: var(--fs-base);
    margin-bottom: 0;
    border-bottom: 0;
    min-height: 56px;
  }

  .tool-group-head .chev {
    display: block;
    order: 3;
  }

  .tool-group-head[aria-expanded="true"] .chev {
    transform: rotate(180deg);
  }

  .tool-links {
    grid-template-columns: 1fr;
    padding-bottom: var(--sp-4);
    border-top: 1px solid var(--border);
    padding-top: var(--sp-3);
  }

  .cta-band {
    margin-top: var(--sp-12);
    padding-block: var(--sp-12);
  }

  .cta-actions .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .category-card:hover,
  .popular-card:hover {
    transform: none;
  }
}