/* ==========================================
   Sticky Header & Mobile Navigation
   ========================================== */

/* --- Header Shell --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  z-index: 900;
  transition: box-shadow var(--transition-base);
}

.site-header--scrolled {
  box-shadow: var(--shadow-md);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

/* --- Logo --- */
.site-logo {
  display: flex;
  align-items: baseline;
  gap: 0.3em;
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo__primary {
  font-family: var(--font-heading);
  font-weight: var(--fw-extrabold);
  font-size: var(--fs-lg);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1;
}

.site-logo__secondary {
  font-family: var(--font-heading);
  font-weight: var(--fw-medium);
  font-size: var(--fs-lg);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1;
}

@media (min-width: 768px) {
  .site-logo__primary,
  .site-logo__secondary {
    font-size: var(--fs-xl);
  }
}

/* --- Desktop Nav --- */
.site-nav {
  display: none;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.site-nav__link {
  font-family: var(--font-heading);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-sm);
  color: var(--color-neutral-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

.site-nav__link:hover,
.site-nav__link--active {
  color: var(--color-primary);
}

.site-nav__link:hover::after,
.site-nav__link--active::after {
  width: 100%;
}

@media (min-width: 768px) {
  .site-nav {
    display: block;
  }
}

/* --- Header Actions (phone + CTA) --- */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header-phone {
  display: none;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: var(--fs-sm);
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

.header-phone svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.header-phone:hover {
  color: var(--color-accent);
}

.header-cta {
  display: none;
}

@media (min-width: 768px) {
  .header-phone {
    display: flex;
  }
}

@media (min-width: 1024px) {
  .header-cta {
    display: inline-flex;
  }
}

/* --- Hamburger Button --- */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-neutral-dark);
  border-radius: 2px;
  transition: transform var(--transition-base),
              opacity var(--transition-fast);
  transform-origin: center;
}

/* Animate to X when open */
.hamburger--open .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.hamburger--open .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 768px) {
  .hamburger {
    display: none;
  }
}

/* --- Mobile Menu Overlay --- */
.mobile-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  background-color: var(--color-white);
  z-index: 899;
  display: flex;
  flex-direction: column;
  padding: var(--space-xl) var(--space-md);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  overflow-y: auto;
}

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

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.mobile-menu__link {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: var(--fs-xl);
  color: var(--color-neutral-dark);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast);
}

.mobile-menu__link:hover,
.mobile-menu__link--active {
  color: var(--color-accent);
}

.mobile-menu__actions {
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.mobile-menu__phone {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: var(--fs-lg);
  color: var(--color-primary);
  padding: var(--space-md);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
}

.mobile-menu__phone svg {
  width: 22px;
  height: 22px;
}