/* ═══════════════════════════════════════════════════════
   IVAN.BAR — Header & Navigation
   ═══════════════════════════════════════════════════════ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--header-height);
  background: rgba(250, 247, 242, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: background var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              height var(--duration-normal) var(--ease-out);
}

.site-header.is-scrolled {
  background: rgba(250, 247, 242, 0.85);
  border-bottom-color: var(--color-border-light);
  box-shadow: var(--shadow-xs);
  height: calc(var(--header-height) - 16px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ─── Logo ─── */
.site-header__logo {
  flex-shrink: 0;
  text-decoration: none;
}

.site-header__logo-text {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  color: var(--color-brand-red);
  letter-spacing: 0.01em;
  line-height: 1;
  transition: font-size var(--duration-normal) var(--ease-out);
}

.site-header.is-scrolled .site-header__logo-text {
  font-size: 1.35rem;
}

/* ─── Nav ─── */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.site-nav__link {
  position: relative;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-brand-red);
  transition: width var(--duration-normal) var(--ease-out), left var(--duration-normal) var(--ease-out);
  border-radius: 2px;
}

.site-nav__link:hover {
  color: var(--color-dark);
}

.site-nav__link:hover::after,
.site-nav__link.is-active::after {
  width: calc(100% - var(--space-8));
  left: var(--space-4);
}

.site-nav__link.is-active {
  color: var(--color-dark);
}

.site-nav__cta {
  margin-left: var(--space-4);
}

/* ─── Mobile Toggle ─── */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  z-index: var(--z-overlay);
}

.mobile-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: all var(--duration-normal) var(--ease-out);
}

.mobile-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-toggle.is-open span:nth-child(2) { opacity: 0; }
.mobile-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── Mobile Menu ─── */
@media (max-width: 768px) {
  .mobile-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100dvh;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-2);
    background: var(--color-background);
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-out);
    z-index: var(--z-fixed);
    padding: var(--space-8);
  }

  .site-nav.is-open { transform: translateX(0); }

  .site-nav__link {
    font-size: var(--text-xl);
    padding: var(--space-4) var(--space-6);
    width: 100%;
    text-align: center;
  }

  .site-nav__cta {
    margin-left: 0;
    margin-top: var(--space-4);
    width: 100%;
    text-align: center;
  }
}

/* ─── Header spacer ─── */
.header-spacer {
  height: var(--header-height);
}