/* ═══════════════════════════════════════════════════════════════
   LAYOUT & STRUCTURAL ENGINE
   Handles page routing, grid systems, and core responsive behavior.
═══════════════════════════════════════════════════════════════ */

/* ── 1. SPA PAGE ROUTING ── */
.page {
  display: none;
  opacity: 0;
  animation: pageFadeIn var(--dur-slow) var(--ease-spring) forwards;
}

.page.active {
  display: block;
}

@keyframes pageFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── 2. GLOBAL CONTAINERS ── */
.text-page-wrap {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: var(--z-base);
  padding-top: calc(72px + var(--space-16));
}

.page-lead {
  font-size: var(--text-lg);
  font-weight: 300;
  line-height: var(--lead-relaxed);
  color: var(--ink-secondary);
  margin-bottom: var(--space-10);
  padding-bottom: var(--space-10);
  border-bottom: 1px solid var(--border);
  letter-spacing: var(--track-tight);
}

.section-wrap {
  padding: var(--space-32) var(--space-16);
  position: relative;
  overflow: hidden;
}

.section-wrap.light {
  background: var(--white);
}

.section-wrap.off-white {
  background: var(--bg-base);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-max {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: var(--z-elevated);
}

/* Base Two-Column Grid */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-20);
  align-items: center;
}

.two-col.reversed {
  direction: rtl;
}

.two-col.reversed > * {
  direction: ltr;
}

/* ── 3. NAVIGATION BAR (Glassmorphism) ── */
#main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-16);
  background: rgba(255, 255, 255, 0);
  border-bottom: 1px solid transparent;
  transition: 
    background var(--dur-slow) var(--ease-spring), 
    box-shadow var(--dur-slow) var(--ease-spring), 
    border-color var(--dur-slow) var(--ease-spring),
    transform 0.3s var(--ease-spring);
}

#main-nav.nav-scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: 0 1px 0 var(--border), 0 8px 32px rgba(2, 6, 23, 0.03);
  border-color: var(--border);
}

#main-nav.nav-hidden {
  transform: translateY(-100%);
}

/* ── LOGO STAYS VISIBLE WHEN NAV HIDES ── */
#main-nav.nav-hidden .nav-logo {
  transform: translateY(100%);
  transition: transform 0.3s var(--ease-spring);
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
  cursor: pointer;
  transition: opacity var(--dur-base) var(--ease-out);
}

.nav-logo:hover {
  opacity: 0.8;
}

.nav-logo img {
  height: 80px;
  width: auto;
  display: block;
}

/* Nav Links Group */
.nav-center {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ink-tertiary);
  text-decoration: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--rad-full);
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
  background: none;
  border: none;
  letter-spacing: var(--track-tight);
  cursor: pointer;
}

.nav-link:hover, 
.nav-link.active {
  color: var(--ink-primary);
  background: var(--bg-raised);
}

/* Nav Actions Group */
.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ── 4. MOBILE MENU & OVERLAY ── */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-1);
  z-index: var(--z-modal);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink-primary);
  border-radius: var(--rad-full);
  transition: transform var(--dur-base) var(--ease-spring), opacity var(--dur-base);
}

.hamburger.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

.mob-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: var(--z-overlay);
  padding: var(--space-8);
  flex-direction: column;
  border-top: 1px solid var(--border);
  animation: menuSlideDown var(--dur-base) var(--ease-spring) forwards;
}

@keyframes menuSlideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.mob-menu.open {
  display: flex;
}

.mob-menu button, 
.mob-menu a {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--ink-primary);
  background: none;
  border: none;
  text-align: left;
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  text-decoration: none;
  letter-spacing: var(--track-tighter);
  transition: color var(--dur-fast) var(--ease-out), padding-left var(--dur-base) var(--ease-spring);
}

.mob-menu button:hover, 
.mob-menu a:hover {
  color: var(--cb-blue-600);
  padding-left: var(--space-2);
}

/* ── 5. HERO STRUCTURAL GRID ── */
.hero {
  min-height: 100vh;
  padding-top: 72px;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: var(--white);
}

.hero-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-20) var(--space-16) var(--space-10);
  width: 100%;
  position: relative;
  z-index: var(--z-elevated);
  gap: var(--space-16);
}

.hero-left {
  display: flex;
  flex-direction: column;
  padding-right: var(--space-10);
}

.hero-right {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  height: 700px;
  opacity: 0;
  animation: fadeSlideUp 1s 0.35s var(--ease-spring) forwards;
}

/* ── 6. FOOTER LAYOUT ── */
footer {
  background: var(--white);
  border-top: 1px solid var(--border);
  padding: var(--space-10) var(--space-16);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-6);
  z-index: var(--z-elevated);
  position: relative;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.footer-logo img {
  height: 80px;
  width: auto;
  opacity: 1;
}

.footer-copy {
  font-size: var(--text-sm);
  color: var(--ink-tertiary);
  font-weight: 500;
}

.footer-links {
  display: flex;
  gap: var(--space-8);
  align-items: center;
}

.footer-links button, 
.footer-links a {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ink-tertiary);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out);
}

.footer-links button:hover, 
.footer-links a:hover {
  color: var(--ink-primary);
}

/* ── 7. RESPONSIVE BREAKPOINTS (Mobile Reflows) ── */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    padding: var(--space-10) var(--space-8);
    gap: var(--space-16);
  }
  .hero-left { padding-right: 0; }
  .two-col { gap: var(--space-16); }
}

@media (max-width: 960px) {
  #main-nav { padding: 0 var(--space-6); }
  .nav-center, .nav-right .nav-btn-ghost { display: none; }
  .hamburger { display: flex; }

  .hero-right { 
    height: auto; 
    width: 100%; 
    margin-top: var(--space-5); 
    padding-bottom: var(--space-10); 
    justify-content: center;
    align-items: flex-start;
  }

  .hero { min-height: auto; padding-bottom: var(--space-20); }

  .two-col { grid-template-columns: 1fr; gap: var(--space-16); }
  .two-col.reversed { direction: ltr; }

  .section-wrap { padding: var(--space-24) var(--space-6); }

  footer { 
    padding: var(--space-10) var(--space-6); 
    flex-direction: column; 
    align-items: center; 
    text-align: center; 
  }
  .footer-links { flex-wrap: wrap; justify-content: center; }
}

@media (max-width: 480px) {
  .hero-layout { padding: var(--space-8) var(--space-4); }
  .section-wrap { padding: var(--space-16) var(--space-4); }
  footer { padding: var(--space-8) var(--space-4); }
}