/**
 * Browser Arcade - Platform Layout & Shell Styles
 * Responsive, mobile-first arcade header, navigation, and footer
 */

/* ==========================================================================
   Skip Link (Accessibility)
   ========================================================================== */

.skip-to-content {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--primary-500);
  color: #ffffff;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-weight: 700;
  z-index: 9999;
  transition: top var(--transition-fast);
}

.skip-to-content:focus {
  top: 15px;
}

/* ==========================================================================
   Platform Shell Layout
   ========================================================================== */

.arcade-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.arcade-main {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.arcade-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 500;
}

.arcade-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.arcade-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--text-main);
  text-decoration: none;
}

.arcade-brand-logo {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.arcade-brand-text span {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.arcade-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.arcade-nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

.arcade-nav-link:hover,
.arcade-nav-link.active {
  color: var(--text-main);
}

.arcade-nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
}

.arcade-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Mobile Hamburger Toggle */
.arcade-mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 8px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
}

.arcade-mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.arcade-mobile-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.arcade-mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.arcade-mobile-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Navigation Drawer */
.arcade-mobile-drawer {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-app);
  display: flex;
  flex-direction: column;
  padding: 24px;
  gap: 16px;
  z-index: 490;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
  border-bottom: 1px solid var(--border-medium);
}

.arcade-mobile-drawer.active {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.arcade-mobile-link {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-muted);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.arcade-mobile-link:hover,
.arcade-mobile-link.active {
  color: var(--text-main);
  background: var(--bg-surface-elevated);
}

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

.arcade-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 32px;
  margin-top: 48px;
  flex-shrink: 0;
}

.arcade-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 36px;
}

.arcade-footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-top: 12px;
  max-width: 320px;
}

.arcade-footer-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-main);
  margin-bottom: 16px;
}

.arcade-footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.arcade-footer-link {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.arcade-footer-link:hover {
  color: var(--primary-400);
}

.arcade-footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 868px) {
  .arcade-nav {
    display: none;
  }
  .arcade-mobile-toggle {
    display: flex;
  }
  .arcade-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}

@media (max-width: 520px) {
  .arcade-footer-grid {
    grid-template-columns: 1fr;
  }
  .arcade-footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}