/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background var(--dur-mid) var(--ease),
              backdrop-filter var(--dur-mid) var(--ease),
              border-color var(--dur-mid) var(--ease);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(13, 13, 13, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-color: var(--clr-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  line-height: 1;
  transition: opacity var(--dur-fast) var(--ease);
  text-decoration: none;
}

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

/* Logo image (shown when logo.png/svg is present) */
.logo-img {
  height: 44px;
  width: auto;
  max-width: 200px;
  object-fit: contain;
  display: block;
  /* Ensures white/light logos look good on dark bg */
  filter: brightness(1);
}

/* Text fallback (shown only if logo image fails) */
.logo-text-wrap {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.logo-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--clr-white);
}

.logo-tagline {
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: 400;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--clr-accent);
}

/* Main navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

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

.nav-links a {
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clr-muted);
  position: relative;
  padding-bottom: 3px;
  transition: color var(--dur-fast) var(--ease);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--clr-accent);
  transition: width var(--dur-mid) var(--ease);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--clr-white);
}

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

/* CTA button in nav */
.nav-cta {
  padding: 0.6rem 1.4rem;
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border: 1px solid var(--clr-accent);
  color: var(--clr-accent);
  transition: all var(--dur-mid) var(--ease);
}

.nav-cta:hover {
  background: var(--clr-accent);
  color: var(--clr-bg);
}

/* Mobile hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1100;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--clr-text);
  transition: transform var(--dur-mid) var(--ease),
              opacity var(--dur-mid) var(--ease);
  transform-origin: center;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.hamburger.open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile menu overlay */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--clr-bg);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-mid) var(--ease);
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu .nav-links {
  flex-direction: column;
  gap: var(--space-md);
  text-align: center;
}

.mobile-menu .nav-links a {
  font-size: var(--fs-lg);
  font-family: var(--font-display);
  font-weight: 300;
  letter-spacing: 0.05em;
  color: var(--clr-text);
}

.mobile-menu .nav-cta {
  margin-top: var(--space-md);
}

@media (max-width: 900px) {
  .main-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-menu {
    display: flex;
  }
}