/* ==========================================================================
   Launch Overseas Limited - Layout, Navigation & Breakpoints
   ========================================================================== */

/* Global Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-stone);
  z-index: 1000;
  padding-top: env(safe-area-inset-top);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 12px;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-logo-svg {
  flex-shrink: 0;
  display: block;
}

.brand-names {
  display: flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
}

.brand-primary {
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--color-indigo);
}

.brand-secondary {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-azure);
}

.desktop-nav .nav-links {
  display: flex;
  list-style: none;
  gap: 20px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-smooth);
}

.nav-links a:hover {
  color: var(--color-indigo);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* 3-Language Segmented Switcher (Desktop) */
.lang-switch {
  display: inline-flex;
  align-items: center;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-stone);
  border-radius: 4px;
  padding: 2px;
  gap: 2px;
}

.lang-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: 3px;
  min-height: 28px;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

.lang-pill:hover {
  color: var(--color-indigo);
}

.lang-pill.active {
  background-color: var(--bg-surface);
  color: var(--color-indigo);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px 4px;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
}

.mobile-toggle .bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  transition: transform var(--transition-smooth), opacity var(--transition-smooth);
}

.mobile-menu {
  display: none;
}

/* Sections & Structural Layout */
.section-header {
  margin-bottom: 40px;
  max-width: 860px;
}

.section-title {
  font-size: 1.875rem;
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-definition {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.gateway-section, .profiles-section, .roadmap-section, .playbooks-section, .pillars-section, .models-section, .faq-section, .contact-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-stone);
}

.card-grid {
  display: grid;
  gap: 24px;
}

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

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

/* Footer Layout */
.site-footer {
  padding: 48px 0;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-stone);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1.2fr;
  gap: 24px;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.footer-brand-lockup {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 4px;
}

.footer-brand {
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--color-indigo);
}

.footer-brand-zh, .footer-brand-en {
  font-size: 0.75rem;
  color: var(--color-azure);
  font-weight: 600;
}

.footer-sub {
  font-size: 0.75rem;
  margin-top: 2px;
}

.footer-right {
  text-align: right;
}

.footer-links {
  margin-top: 4px;
  font-size: 0.75rem;
}

.link-divider {
  margin: 0 6px;
  color: var(--border-stone);
}

/* Responsive Adaptations */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .card-grid.three-col, .card-grid.two-col, .faq-grid {
    grid-template-columns: 1fr;
  }

  .trust-commitments, .contact-channels {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: left;
    gap: 16px;
  }

  .footer-right {
    text-align: left;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .container {
    padding: 0 16px;
  }

  /* Clean Mobile Header */
  .desktop-nav, .nav-cta, .brand-secondary, .lang-switch {
    display: none;
  }

  .brand-primary {
    font-size: 0.9375rem;
  }

  .mobile-toggle {
    display: flex;
  }

  .section-title {
    font-size: 1.5rem;
  }

  /* Mobile Drawer Overlay */
  .mobile-menu {
    display: block;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100dvh - var(--header-height));
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-stone);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-smooth), opacity var(--transition-smooth);
    z-index: 999;
  }

  .mobile-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .mobile-menu-inner {
    padding: 28px 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    overflow-y: auto;
  }

  .mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .mobile-nav-links a {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
  }

  .mobile-cta-link {
    color: var(--color-indigo) !important;
    font-weight: 700;
  }

  /* Language Switcher inside Mobile Drawer */
  .mobile-menu-footer {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-top: 20px;
    border-top: 1px solid var(--border-stone);
  }

  .mobile-lang-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    font-weight: 700;
  }

  .mobile-lang-row {
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .mobile-lang-row .lang-pill {
    flex: 1;
    min-height: 40px;
    font-size: 0.875rem;
    background-color: var(--bg-canvas);
    border: 1px solid var(--border-stone);
  }

  .mobile-lang-row .lang-pill.active {
    background-color: var(--color-indigo);
    color: #FFFFFF;
    border-color: var(--color-indigo);
  }
}