/*
 * ==========================================================================
 * NAVIGATION — Sticky header, transparent on hero, solid on scroll
 * Mobile: hamburger menu. Desktop: horizontal links.
 * ==========================================================================
 */

/* --- Site Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition:
    background-color var(--transition-slow),
    height var(--transition-slow),
    box-shadow var(--transition-slow),
    backdrop-filter var(--transition-slow);
}

/* Transparent on hero */
.site-header.is-transparent {
  background-color: transparent;
  backdrop-filter: none;
}

/* Solid when scrolled */
.site-header.is-scrolled {
  height: var(--nav-height-scrolled);
  background-color: rgba(7, 10, 13, 0.95);
  backdrop-filter: blur(16px) saturate(1.2);
  box-shadow: 0 1px 0 var(--color-border), var(--shadow-md);
}

[data-theme="light"] .site-header.is-scrolled {
  background-color: rgba(242, 237, 228, 0.95);
}

/* --- Inner layout --- */
.site-header__inner {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
}

/* --- Logo --- */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo__image {
  height: 40px;
  width: auto;
  transition: filter var(--transition-base);
}

.site-logo__text {
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  font-weight: var(--fw-black);
  color: var(--color-text-primary);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  line-height: 1.1;
  white-space: nowrap;
}

.site-logo__text span {
  display: block;
  font-family: var(--font-ui);
  font-size: var(--fs-2xs);
  font-weight: var(--fw-normal);
  letter-spacing: var(--ls-widest);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.site-logo:hover .site-logo__image {
  filter: drop-shadow(0 0 8px var(--color-accent-glow));
}

/* --- Main navigation (desktop) --- */
.site-nav {
  display: none;
}

@media (min-width: 1024px) {
  .site-nav {
    display: flex;
    align-items: center;
    gap: var(--sp-1);
  }
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  list-style: none;
}

.site-nav__link {
  font-family: var(--font-ui);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-widest);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-md);
  position: relative;
  transition: color var(--transition-base), background var(--transition-base);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: var(--sp-4);
  right: var(--sp-4);
  height: 1px;
  background: var(--color-accent-bright);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.site-nav__link:hover,
.site-nav__link.current-menu-item {
  color: var(--color-text-primary);
}

.site-nav__link:hover::after,
.site-nav__link.current-menu-item::after {
  transform: scaleX(1);
}

/* --- Header actions (right side) --- */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

/* --- Theme Switcher --- */
.theme-switcher {
  position: relative;
}

.theme-switcher__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
}

.theme-switcher__toggle:hover {
  border-color: var(--color-border-accent);
  color: var(--color-accent-text);
  box-shadow: var(--shadow-glow);
}

.theme-switcher__toggle svg {
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.theme-switcher__dropdown {
  position: absolute;
  top: calc(100% + var(--sp-2));
  right: 0;
  min-width: 160px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-mid);
  border-radius: var(--radius-lg);
  padding: var(--sp-2);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base);
  z-index: var(--z-overlay);
}

.theme-switcher.is-open .theme-switcher__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.theme-switcher__option {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: background var(--transition-base), color var(--transition-base);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.theme-switcher__option:hover {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
}

.theme-switcher__option.is-active {
  color: var(--color-accent-text);
}

.theme-swatch {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.theme-swatch--dark  { background: #c0392b; }
.theme-swatch--light { background: #b02828; box-shadow: 0 0 0 1px rgba(0,0,0,0.2); }
.theme-swatch--green { background: #228b22; }
.theme-swatch--blue  { background: #2563b0; }

/* --- Hamburger button (mobile) --- */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--sp-2);
  border-radius: var(--radius-md);
  transition: background var(--transition-base);
}

.nav-toggle:hover {
  background: var(--color-bg-elevated);
}

@media (min-width: 1024px) {
  .nav-toggle { display: none; }
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base), width var(--transition-base);
}
.nav-toggle__bar:nth-child(2) { width: 75%; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
  width: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Mobile menu drawer --- */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) - 1);
  pointer-events: none;
}

.mobile-nav__overlay {
  position: absolute;
  inset: 0;
  background: rgba(7, 10, 13, 0.7);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.mobile-nav__drawer {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  background: var(--color-bg-secondary);
  border-left: 1px solid var(--color-border-mid);
  padding: var(--sp-20) var(--sp-8) var(--sp-8);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
}

.mobile-nav.is-open {
  pointer-events: all;
}
.mobile-nav.is-open .mobile-nav__overlay {
  opacity: 1;
}
.mobile-nav.is-open .mobile-nav__drawer {
  transform: translateX(0);
}

.mobile-nav__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.mobile-nav__link {
  display: block;
  font-family: var(--font-ui);
  font-size: var(--fs-base);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: color var(--transition-base), background var(--transition-base);
}

.mobile-nav__link:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-elevated);
}

@media (min-width: 1024px) {
  .mobile-nav { display: none; }
}