/* Top navigation */

.navbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--dur) var(--ease);
}
.navbar.is-scrolled { box-shadow: var(--shadow-sm); }

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  height: var(--nav-h);
}

.navbar__brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}
.navbar__brand img { height: 40px; width: auto; }

.navbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.navbar__list {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.navbar__link {
  color: var(--color-ink);
  text-decoration: none;
  font-weight: var(--fw-medium);
  padding-block: var(--space-xs);
  border-bottom: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.navbar__link:hover { color: var(--color-accent-hover); }
.navbar__link.is-active { border-bottom-color: var(--color-accent); }

.navbar__cta { flex-shrink: 0; }

/* Hamburger toggle */
.navbar__toggle {
  display: none;
  width: 40px; height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-sm);
}
.navbar__toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

/* Mobile */
@media (max-width: 767px) {
  .navbar__brand img { height: 32px; }

  .navbar__toggle { display: flex; }

  .navbar__nav {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: var(--space-md) var(--space-lg) var(--space-lg);
  }
  .navbar__nav.is-open { display: flex; }

  .navbar__list {
    flex-direction: column;
    gap: 0;
  }
  .navbar__link {
    display: block;
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
  }
  .navbar__link.is-active { border-bottom-color: var(--color-accent); }

  .navbar__cta {
    margin-top: var(--space-md);
    align-self: stretch;
    justify-content: center;
  }

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