/* ========================================
   Base
   ======================================== */

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent-primary);
  color: #fff;
  border-radius: var(--border-radius-sm);
  z-index: 1000;
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-md);
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-primary:hover {
  background: #cf2f3b;
  box-shadow: 0 4px 20px rgba(230, 57, 70, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-card);
  border-color: var(--color-text-secondary);
}

.btn-nav {
  padding: 0.5rem 1rem;
  background: var(--color-accent-primary);
  color: #fff;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
}

.btn-nav:hover {
  background: #cf2f3b;
}

/* ========================================
   Navigation
   ======================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-md) 0;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--color-border-subtle);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
}

.nav-logo-img {
  width: 32px;
  height: 32px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text-primary);
}

/* Site-level tab links */
.nav-tab {
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav-tab:hover {
  border-bottom-color: var(--color-border);
}

.nav-tab.nav-tab--active {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-accent-primary);
}

/* Discord icon link */
.nav-discord {
  margin-left: var(--space-sm);
  display: flex;
  align-items: center;
}

.nav-icon-link {
  display: flex;
  align-items: center;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav-icon-link:hover {
  color: #5865F2;
}

/* Mobile toggle */
.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}

.nav-mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

@media (max-width: 767px) {
  .nav-mobile-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4xl) var(--space-xl);
    gap: var(--space-lg);
    background: var(--color-bg-secondary);
    border-left: 1px solid var(--color-border-subtle);
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-cta-item {
    margin-top: auto;
  }

  /* Hamburger animation */
  .site-header.nav-open .nav-mobile-toggle span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .site-header.nav-open .nav-mobile-toggle span:nth-child(2) {
    opacity: 0;
  }
  .site-header.nav-open .nav-mobile-toggle span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
}

/* ========================================
   Hero
   ======================================== */

.hero {
  padding-top: calc(var(--space-4xl) + 60px); /* account for fixed nav */
  padding-bottom: var(--space-section);
  background: var(--color-bg-primary);
}

.hero-inner {
  display: grid;
  gap: var(--space-3xl);
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr 1fr;
  }
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, #f4a0a6 0%, var(--color-accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.hero-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin-bottom: var(--space-2xl);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* ========================================
   Feature Sections
   ======================================== */

.feature-section {
  padding: 0 0 var(--space-2xl) 0;
}

.feature-section:first-of-type {
  padding-top: var(--space-section);
}

.feature-row {
  display: grid;
  gap: var(--space-2xl);
  align-items: center;
  grid-template-columns: 1fr;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--border-radius-lg);
  padding: var(--space-2xl);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.feature-row:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-card);
}

@media (min-width: 768px) {
  .feature-row {
    grid-template-columns: 1fr 1.2fr;
    padding: var(--space-3xl);
  }

  .feature-row--reverse {
    grid-template-columns: 1.2fr 1fr;
  }

  .feature-row--reverse .feature-text {
    order: 2;
  }

  .feature-row--reverse .feature-media {
    order: 1;
  }
}

.feature-heading {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

/* Per-feature accent colors on headings */
.feature-section[data-category="codefirst"]  .feature-heading { color: var(--color-codefirst); }
.feature-section[data-category="rendering"]  .feature-heading { color: var(--color-rendering); }
.feature-section[data-category="sprites"]    .feature-heading { color: var(--color-sprites); }
.feature-section[data-category="editor"]     .feature-heading { color: var(--color-editor); }
.feature-section[data-category="ui"]         .feature-heading { color: var(--color-ui); }
.feature-section[data-category="vfx"]        .feature-heading { color: var(--color-vfx); }
.feature-section[data-category="platform"]   .feature-heading { color: var(--color-platform); }

/* Subtle accent glow on hover per feature */
.feature-section[data-category="codefirst"]  .feature-row:hover { border-color: rgba(230, 57, 70, 0.3); }
.feature-section[data-category="rendering"]  .feature-row:hover { border-color: rgba(249, 115, 22, 0.3); }
.feature-section[data-category="sprites"]    .feature-row:hover { border-color: rgba(68, 212, 146, 0.3); }
.feature-section[data-category="editor"]     .feature-row:hover { border-color: rgba(236, 72, 153, 0.3); }
.feature-section[data-category="ui"]         .feature-row:hover { border-color: rgba(192, 132, 252, 0.3); }
.feature-section[data-category="vfx"]        .feature-row:hover { border-color: rgba(244, 63, 94, 0.3); }
.feature-section[data-category="platform"]   .feature-row:hover { border-color: rgba(14, 165, 233, 0.3); }

.feature-text p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}

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

.feature-media {
  border-radius: var(--card-border-radius);
  overflow: hidden;
}

/* Platform Grid */
.platform-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  padding: var(--space-lg);
}

.platform-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg);
  border-radius: var(--card-border-radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.platform-tile svg {
  width: 40px;
  height: 40px;
  color: var(--color-text-secondary);
}

.platform-tile span {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* Also Includes */
.also-includes-section {
  padding: var(--space-section) 0 var(--space-3xl) 0;
}

.also-includes-section .feature-heading {
  color: var(--color-text-primary);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xl);
  text-align: center;
}

.also-includes-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 640px) {
  .also-includes-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .also-includes-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.also-includes-tile {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border-subtle);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.also-includes-tile:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-card);
}

.also-includes-tile strong {
  display: block;
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.also-includes-tile span {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Per-tile accent colors on title */
.also-includes-tile[data-category="assets"]     strong { color: var(--color-assets); }
.also-includes-tile[data-category="text"]        strong { color: var(--color-text-render); }
.also-includes-tile[data-category="physics"]     strong { color: var(--color-physics); }
.also-includes-tile[data-category="audio"]       strong { color: var(--color-audio); }
.also-includes-tile[data-category="input"]       strong { color: var(--color-input); }
.also-includes-tile[data-category="tweens"]      strong { color: var(--color-tweens); }
.also-includes-tile[data-category="networking"]  strong { color: var(--color-networking); }

/* ========================================
   Footer
   ======================================== */

.site-footer {
  padding: var(--space-4xl) 0 var(--space-xl);
  background: var(--color-bg-primary);
  border-top: 1px solid var(--color-border-subtle);
}

.footer-inner {
  display: grid;
  gap: var(--space-3xl);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-3xl);
}

@media (min-width: 640px) {
  .footer-inner {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.footer-logo-img {
  width: 40px;
  height: 40px;
}

.footer-brand p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.footer-links h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-copyright {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border-subtle);
}