/* ==========================================================================
   sims.science — Home Page Styles
   Design system powered, theme-switchable landing page.
   tokens.css is loaded directly via <link> in default layout.
   ========================================================================== */

/* ==================================================================
   LAYOUT OVERRIDE — Break out of default layout's Primer container
   ================================================================== */
/* ==================================================================
   ONBOARDING BANNER — First-visit dismissible banner
   ================================================================== */
.onboarding-banner {
  position: relative;
  z-index: var(--z-dropdown, 100);
  background: linear-gradient(135deg, rgba(8,145,178,0.08), rgba(8,145,178,0.03));
  border-bottom: 1px solid rgba(8,145,178,0.15);
  padding: 0 var(--space-6);
}

.onboarding-banner-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.onboarding-banner-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
}

.onboarding-banner-text strong {
  color: var(--color-text-primary);
  margin-right: 0.25rem;
}

.onboarding-banner-link {
  color: var(--color-primary) !important;
  font-weight: 600;
  text-decoration: underline !important;
  text-underline-offset: 2px;
}

.onboarding-banner-link:hover {
  color: var(--color-primary-hover) !important;
}

.onboarding-banner-close {
  margin-left: auto;
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  font-size: 1.3rem;
  line-height: 1;
  color: var(--color-text-tertiary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.onboarding-banner-close:hover {
  color: var(--color-text-primary);
  background: rgba(0,0,0,0.05);
}

.onboarding-banner-hidden {
  display: none !important;
}

body.page-home main.container-lg {
  max-width: none;
  padding: 0;
  margin: 0;
}

body.page-home .markdown-body {
  padding: 0;
}

/* Hide GitHub "open source" footer on landing page */
body.page-home .markdown-body .footer.text-right {
  display: none;
}

/* ==================================================================
   NAV — Glass-morphism overlay for existing nav.html structure
   ================================================================== */
body.page-home .site-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.82) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-light);
  padding: 0 var(--space-6);
  height: 60px;
  display: flex;
  align-items: center;
  box-shadow: none !important;
}

[data-theme="dark-tech"] body.page-home .site-nav {
  background: rgba(11, 17, 33, 0.85) !important;
  border-bottom-color: var(--color-border);
}

[data-theme="warm-academic"] body.page-home .site-nav {
  background: rgba(255, 253, 247, 0.85) !important;
}

[data-theme="fresh-green"] body.page-home .site-nav {
  background: rgba(249, 252, 250, 0.85) !important;
}

[data-theme="minimal-mono"] body.page-home .site-nav {
  background: rgba(255, 255, 255, 0.85) !important;
}

/* ==================================================================
   SECTION & CONTAINER SYSTEM
   ================================================================== */
.section {
  padding: var(--space-20) 0;
}

.section-alt {
  background: var(--color-surface-subtle);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--leading-relaxed);
}

/* ==================================================================
   THEME TOGGLES REMOVED — Site uses a single default 'modern-blue' theme.
   Theme CSS custom properties are defined in tokens.css under [data-theme].
   ================================================================== */

/* ==================================================================
   HERO — Centered, bold typography
   ================================================================== */
.hero {
  padding: var(--space-20) 0 var(--space-16);
  text-align: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.hero .container-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
  flex-shrink: 0;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: var(--text-5xl);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
  max-width: 820px;
  margin: 0 auto var(--space-6);
}

.hero-title-accent {
  color: var(--color-primary);
}

.hero-subtitle {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto var(--space-8);
}

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

/* ==================================================================
   BUTTON SYSTEM
   ================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none !important;
  white-space: nowrap;
  border: 1px solid transparent;
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-5);
}

.btn-lg {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-8);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse) !important;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-xs);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
  color: var(--color-text-inverse) !important;
}

.btn-outline {
  background: transparent;
  color: var(--color-text-primary) !important;
  border-color: var(--color-border);
}

.btn-outline:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-text-primary) !important;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary) !important;
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--color-primary-light);
  color: var(--color-text-primary) !important;
}

/* ==================================================================
   STATS ROW — Social proof under hero
   ================================================================== */
.stats-row {
  display: flex;
  justify-content: center;
  gap: var(--space-16);
  flex-wrap: wrap;
  text-align: center;
  padding: var(--space-12) 0 0;
}

.stat-item {
  min-width: 120px;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  font-weight: 500;
}

/* ==================================================================
   FEATURE GRID — 4-column, hover lift
   ================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.feature-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
  border-color: var(--color-primary-subtle);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: var(--space-4);
  background: var(--color-primary-light);
}

.feature-card h3 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.feature-card p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ==================================================================
   HOW IT WORKS — 3-step numbered process
   ================================================================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.step-card {
  text-align: center;
  position: relative;
}

.step-number {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--gradient-cta);
  color: var(--color-text-inverse);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-5);
}

.step-card h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.step-card p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ==================================================================
   CATEGORY GRID — 5-card domain explorer
   ================================================================== */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-4);
}

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  text-decoration: none !important;
  color: var(--color-text-primary) !important;
  text-align: center;
  transition: all var(--transition-base);
  gap: var(--space-3);
  min-height: 180px;
}

.category-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.category-icon {
  font-size: 32px;
  line-height: 1;
}

.category-card h3 {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  margin: 0;
}

.category-count {
  font-size: var(--text-xs);
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* ==================================================================
   FOR TEACHERS & FOR STUDENTS — Audience sections
   ================================================================== */
.audience-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}

.audience-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
}

.audience-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.audience-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: var(--space-4);
  background: var(--color-primary-light);
}

.audience-card h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.audience-card p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.audience-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.audience-card li {
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.audience-card li::before {
  content: '✓';
  color: var(--color-success);
  font-weight: 700;
}

.audience-cta {
  margin-top: var(--space-4);
  display: inline-block;
}

/* ==================================================================
   ABOUT — Creator section
   ================================================================== */
.about-section {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-8);
  align-items: start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
}

.about-section:hover {
  box-shadow: var(--shadow-card-hover);
}

.about-photo {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  object-fit: cover;
  flex-shrink: 0;
}

.about-text h2 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.about-text p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-3);
}

.about-text p:last-child {
  margin-bottom: 0;
}

/* ==================================================================
   CTA SECTION — Bold gradient call-to-action
   ================================================================== */
.cta-section {
  padding: var(--space-16) 0;
  background: var(--gradient-cta);
  text-align: center;
  color: var(--color-text-inverse);
}

.cta-section .section-title {
  color: var(--color-text-inverse);
}

.cta-section .section-subtitle {
  color: rgba(255, 255, 255, 0.85);
}

.cta-section .btn-primary {
  background: var(--color-text-inverse);
  color: var(--color-primary) !important;
  border-color: var(--color-text-inverse);
}

.cta-section .btn-primary:hover {
  background: rgba(255, 255, 255, 0.9);
  color: var(--color-primary-hover) !important;
}

.cta-section .btn-outline {
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-text-inverse) !important;
}

.cta-section .btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

/* ==================================================================
   FOOTER — Clean, minimal
   ================================================================== */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.footer-brand-tagline {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  line-height: var(--leading-relaxed);
}

.footer-col h4 {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-4);
}

.footer-col a {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: var(--space-1) 0;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.footer-col a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-light);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.footer-ct-logo {
  height: 1em;
  vertical-align: middle;
}

/* ==================================================================
   RESPONSIVE BREAKPOINTS
   ================================================================== */

/* Tablet */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .categories-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-title {
    font-size: var(--text-4xl);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .hero {
    padding: var(--space-12) 0 var(--space-10);
  }

  .hero-title {
    font-size: var(--text-3xl);
  }

  .hero-subtitle {
    font-size: var(--text-base);
  }

  .section {
    padding: var(--space-12) 0;
  }

  .section-title {
    font-size: var(--text-2xl);
  }

  .stats-row {
    gap: var(--space-8);
  }

  .stat-value {
    font-size: var(--text-3xl);
  }

  .steps-grid {
    grid-template-columns: 1fr;
    max-width: 360px;
    margin: 0 auto;
  }

  .categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .audience-grid {
    grid-template-columns: 1fr;
  }

  .about-section {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-photo {
    margin: 0 auto;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .features-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* ==================================================================
   TRANSITION SUPPRESSION — Prevent flash on theme change
   ================================================================== */
.no-transitions,
.no-transitions *,
.no-transitions *::before,
.no-transitions *::after {
  transition: none !important;
}