/* ==========================================================================
   LAYOUT: NAVBAR, HEADER, FOOTER, GRIDS
   Gioele Lombardi - Premium Web Development & Design
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Sticky Header & Navbar
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: var(--z-header);
  transition: background-color var(--transition-normal), 
              border-color var(--transition-normal), 
              height var(--transition-normal),
              box-shadow var(--transition-normal);
  background: transparent;
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  height: calc(var(--header-height) - 10px);
  box-shadow: 0 10px 30px rgba(34, 48, 76, 0.12);
}

.nav-container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

/* Brand Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  text-decoration: none;
  z-index: calc(var(--z-modal) + 1);
}

.site-header:not(.scrolled) .brand-logo,
.site-header:not(.scrolled) .nav-link {
  color: var(--text-primary);
}

.brand-monogram {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.04em;
  box-shadow: 0 2px 10px var(--accent-glow);
}

.brand-title {
  display: flex;
  flex-direction: column;
}

.brand-name {
  line-height: 1.15;
}

.brand-subtitle {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Desktop Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.85rem;
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.4rem 0;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition-fast);
  border-radius: var(--radius-full);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--text-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Hamburger toggle for mobile */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  cursor: pointer;
  z-index: calc(var(--z-modal) + 1);
  transition: var(--transition-fast);
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
  margin: 2.5px 0;
}

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

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

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

/* Mobile Navigation Drawer */
.mobile-nav-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(31, 41, 55, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.mobile-nav-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 360px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-subtle);
  z-index: calc(var(--z-modal) + 1);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  padding: 6rem 2rem 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: -10px 0 30px rgba(34, 48, 76, 0.18);
  overflow-y: auto;
}

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

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-nav-link {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-nav-link:hover, .mobile-nav-link.active {
  color: #ffffff;
  padding-left: 0.5rem;
}

.mobile-nav-footer {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* --------------------------------------------------------------------------
   2. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: #eef1f6;
  border-top: 1px solid var(--border-subtle);
  padding: 4.5rem 0 2.5rem 0;
  position: relative;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand p {
  margin-top: 1.25rem;
  max-width: 320px;
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.footer-heading {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.footer-nav a:hover {
  color: var(--text-primary);
  transform: translateX(3px);
}

.footer-contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.footer-contact-item svg {
  width: 16px;
  height: 16px;
  color: var(--accent-azure);
  flex-shrink: 0;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.footer-legal-note {
  max-width: 500px;
  line-height: 1.5;
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  transition: var(--transition-fast);
}

.back-to-top:hover {
  color: var(--text-primary);
  background: rgba(44, 54, 78, 0.08);
  border-color: var(--border-hover);
}