/* ============================================
   HEADER
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 24px 40px;
  transition: background-color 0.4s ease, backdrop-filter 0.4s ease;
}

.header.scrolled {
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(13px);
  -webkit-backdrop-filter: blur(13px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1440px;
  margin: 0 auto;
}

/* Logo */
.header-logo {
  display: flex;
  align-items: center;
  z-index: 1001;
  font-size: 22px;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  color: var(--color-text);
  transition: color 0.3s ease;
}

.header-logo .dot {
  color: var(--color-accent);
}

/* Right side */
.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
  z-index: 1001;
}

/* CTA Button */
.btn-cta {
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text);
  background: var(--color-glass-bg);
  backdrop-filter: blur(13px);
  -webkit-backdrop-filter: blur(13px);
  transition: background-color 0.3s var(--ease-hover), border-color 0.3s var(--ease-hover);
}

.btn-cta:hover {
  background: var(--color-glass-bg-hover);
  border-color: rgba(255, 255, 255, 0.35);
}

/* Hamburger */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  padding: 8px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: var(--color-text);
  transition: transform 0.4s var(--ease-general), opacity 0.3s ease;
  transform-origin: center;
}

.hamburger.active span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}

.hamburger.active span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

/* ============================================
   FULLSCREEN NAV OVERLAY
   ============================================ */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s var(--ease-general);
}

.nav-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.nav-link {
  font-size: min(8vw, 72px);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--color-text);
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.5s var(--ease-text-reveal), transform 0.6s var(--ease-text-reveal), color 0.3s ease;
}

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

.nav-link:nth-child(1) { transition-delay: 0.1s; }
.nav-link:nth-child(2) { transition-delay: 0.15s; }
.nav-link:nth-child(3) { transition-delay: 0.2s; }
.nav-link:nth-child(4) { transition-delay: 0.25s; }
.nav-link:nth-child(5) { transition-delay: 0.3s; }

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

/* ============================================
   PRELOADER
   ============================================ */
#preloader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

#preloader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preloader-logo {
  font-size: 48px;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.preloader-logo .dot {
  color: var(--color-accent);
}

@media (max-width: 768px) {
  .header {
    padding: 16px 20px;
  }

  .btn-cta {
    display: none;
  }

  .hamburger {
    width: 36px;
    height: 36px;
  }
}