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

/* Top Bar */
.topbar {
  background: var(--clr-primary-dark);
  padding: var(--sp-2) 0;
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.8);
  display: none; /* shown on md+ */
}
@media (min-width: 768px) { .topbar { display: block; } }

.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
}
.topbar__left, .topbar__right {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
}
.topbar a {
  color: rgba(255,255,255,0.8);
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  transition: color var(--dur-fast);
  min-width: 0;
}
.topbar a:hover { color: var(--clr-accent-light); }
.topbar__left a,
.topbar__right a {
  overflow-wrap: anywhere;
  word-break: break-word;
}
.topbar__social {
  display: flex;
  gap: var(--sp-3);
}
.topbar__social a { font-size: var(--fs-sm); }

/* Main Header */
.site-header {
  background: var(--clr-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  border-bottom: 2px solid transparent;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}
.site-header.scrolled {
  border-bottom-color: var(--clr-accent);
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 82px;
  padding-block: var(--sp-3);
  gap: var(--sp-6);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
  min-width: 0;
}
.logo__image {
  display: block;
  height: 54px;
  width: auto;
  max-width: min(58vw, 300px);
  object-fit: contain;
}

/* Navigation */
.nav { display: flex; align-items: center; gap: var(--sp-1); }

.nav__item {
  position: relative;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-dark);
  border-radius: var(--radius-md);
  transition: color var(--dur-fast), background var(--dur-fast);
  white-space: nowrap;
  text-decoration: none;
}
.nav__link:hover, .nav__link.active {
  color: var(--clr-primary);
  background: var(--clr-ivory);
}
.nav__link.active {
  font-weight: var(--fw-bold);
}
.nav__link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: var(--sp-3);
  right: var(--sp-3);
  height: 2px;
  background: var(--clr-accent);
  border-radius: 2px 2px 0 0;
}

.nav__cta {
  margin-left: var(--sp-2);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  z-index: var(--z-modal);
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--clr-primary);
  border-radius: 2px;
  transition: all var(--dur-normal) var(--ease-out);
  transform-origin: center;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* Mobile Nav */
@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .header-inner { min-height: 76px; }
  .logo__image { height: 46px; max-width: min(64vw, 240px); }
  .nav__list-wrapper {
    position: fixed;
    inset: 0;
    background: var(--clr-white);
    z-index: var(--z-overlay);
    display: flex;
    flex-direction: column;
    padding: 100px var(--sp-8) var(--sp-8);
    transform: translateX(100%);
    transition: transform var(--dur-slow) var(--ease-out);
    overflow-y: auto;
  }
  .nav__list-wrapper.open {
    transform: translateX(0);
  }
  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-2);
    width: 100%;
  }
  .nav__item { width: 100%; }
  .nav__link {
    padding: var(--sp-4);
    font-size: var(--fs-lg);
    border-radius: var(--radius-md);
    width: 100%;
  }
  .nav__cta { width: 100%; }
  .nav__cta .btn { width: 100%; justify-content: center; }
}