/* ====================================
   LAYOUT: HEADER, NAVIGATION, FOOTER
==================================== */

/* ---- HEADER ---- */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-bg-glass);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  box-shadow: none;
  transition: all var(--transition-base);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
  border-bottom-color: var(--color-border-strong);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width-full);
  margin: 0 auto;
  padding: var(--space-4);
  gap: var(--space-6);
}

/* ---- LOGO & BRAND ---- */

.logo-section {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-strong);
  border-radius: 12px;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  letter-spacing: 0.08em;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.logo:hover {
  transform: scale(1.05);
  border-color: var(--color-accent);
}

.brand {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  transition: color var(--transition-base);
}

.brand:hover {
  color: var(--color-accent);
}

/* ---- NAVIGATION ---- */

.main-nav {
  display: flex;
  gap: var(--space-6);
  align-items: center;
  flex: 1;
  justify-content: center;
}

.main-nav a {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-secondary);
  position: relative;
  padding-bottom: var(--space-2);
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-text-primary);
  border-bottom-color: transparent;
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.main-nav a:hover::after,
.main-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

/* ---- HEADER ACTIONS ---- */

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-shrink: 0;
}

.btn-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-base);
  transition: all var(--transition-base);
}

.btn-toggle:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-light);
}

/* ---- HAMBURGER ---- */

.hamburger {
  display: none;
  width: 36px;
  height: 36px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: 0;
  flex-direction: column;
  gap: 6px;
  justify-content: center;
  align-items: center;
}

.hamburger span {
  width: 20px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 1px;
  transition: all var(--transition-base);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* ---- MOBILE NAVIGATION ---- */

.mobile-nav {
  display: none;
  position: absolute;
  top: 60px;
  left: 0;
  right: 0;
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-dropdown);
}

.mobile-nav.open {
  display: block;
}

.mobile-nav ul {
  list-style: none;
  padding: var(--space-4) 0;
  margin: 0;
}

.mobile-nav li {
  margin: 0;
}

.mobile-nav a {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border: none;
}

.mobile-nav a:hover,
.mobile-nav a[aria-current="page"] {
  background-color: var(--color-accent-light);
  color: var(--color-text-primary);
  border: none;
}

/* ---- FOOTER ---- */

.site-footer {
  border-top: 1px solid var(--color-border);
  background: linear-gradient(
    135deg, 
    var(--color-bg-surface) 0%, 
    var(--color-bg-base) 100%
  );
  margin-top: var(--space-24);
  padding: var(--space-20) var(--space-4) var(--space-8);
}

.footer-inner {
  max-width: var(--max-width-full);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-10);
}

.footer-brand-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background-color: var(--color-accent);
  color: white;
  border-radius: 14px;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
  box-shadow: var(--shadow-md);
}

.footer-branding-text h2 {
  font-size: var(--font-size-xl);
  margin: 0 0 var(--space-2) 0;
  font-family: var(--font-family-serif);
}

.footer-branding-text p {
  font-size: var(--font-size-sm);
  margin: 0;
  color: var(--color-text-secondary);
  max-width: 320px;
  line-height: var(--line-height-relaxed);
}

.footer-content {
  grid-column: 2 / -1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.footer-column h3 {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  margin-top: 0;
  margin-bottom: var(--space-5);
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--font-size-xs);
}

.footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-column li {
  margin-bottom: var(--space-3);
}

.footer-column a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
  position: relative;
  display: inline-block;
}

.footer-column a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  max-width: var(--max-width-full);
  margin: 0 auto;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-bottom p {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin: 0;
}

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

@media (max-width: 768px) {
  .main-nav {
    display: none;
  }
  
  .hamburger {
    display: flex;
  }
  
  .header-inner {
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
  }
  
  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
  
  .footer-brand-section {
    text-align: center;
    align-items: center;
  }
  
  .footer-logo {
    margin-left: auto;
    margin-right: auto;
  }
  
  .footer-branding-text p {
    max-width: 100%;
  }
  
  .footer-content {
    grid-column: 1;
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 640px) {
  .header-inner {
    padding: var(--space-3);
    gap: var(--space-2);
  }
  
  .header-actions {
    gap: var(--space-2);
  }
  
  .logo {
    width: 36px;
    height: 36px;
  }
}