/* ============================================================
   LAYOUT — Container, Header, Navigation, Footer, Reveal
   ============================================================ */

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  position: relative;
  z-index: var(--z-container);
}

/* ----------------------------------------------------
   HEADER & NAVIGATION
   ---------------------------------------------------- */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-header);
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-dark);
  transition: var(--transition-smooth);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.logo-link {
  display: flex;
  align-items: center;
  height: 52px;
}

.logo-img {
  height: 100%;
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--spacing-3xl);
  list-style: none;
}

.nav-link {
  color: var(--text-dark-muted);
  text-decoration: none;
  font-size: var(--font-size-rg);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  transition: var(--transition-smooth);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  width: 100%;
  transform: scaleX(0);
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: var(--color-purple);
  transform-origin: bottom right;
  transition: transform var(--transition-smooth);
}

.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: bottom left;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

/* Mobile Hamburger Menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 24px;
  position: relative;
  z-index: var(--z-menu-toggle);
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-dark);
  position: absolute;
  transition: var(--transition-smooth);
}

.menu-toggle span:nth-child(1) { top: 2px; }
.menu-toggle span:nth-child(2) { top: 11px; }
.menu-toggle span:nth-child(3) { top: 20px; }

.menu-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 80px;
  left: 0;
  width: 100%;
  background-color: var(--color-bg-white);
  border-bottom: 1px solid var(--border-dark);
  padding: 30px var(--spacing-xl);
  z-index: var(--z-mobile-nav);
  transform: translateY(-100%);
  opacity: 0;
  transition: transform var(--transition-smooth), opacity var(--transition-smooth);
}

.mobile-nav.active {
  transform: translateY(0);
  opacity: 1;
}

.mobile-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  list-style: none;
  margin-bottom: 30px;
}

.mobile-link {
  color: var(--text-dark);
  text-decoration: none;
  font-size: var(--font-size-xl);
  font-family: var(--font-display);
  font-weight: 500;
}

/* ----------------------------------------------------
   FOOTER
   ---------------------------------------------------- */
footer {
  background-color: #F0F0F2;
  border-top: 1px solid var(--border-dark);
  padding: var(--spacing-4xl) 0;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.footer-logo {
  height: 42px;
  width: auto;
}

.copyright {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  color: var(--color-grey);
}

/* ----------------------------------------------------
   SCROLL-TRIGGERED REVEAL ANIMATIONS
   ---------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1), transform 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

.reveal-visible {
  opacity: 1;
  transform: translateY(0);
}