/* ============================================================
   NAVBAR.CSS
   Sistema Cardano Day · ITIS G. Cardano, Pavia
   ============================================================ */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-dark);
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
  transition: box-shadow var(--transition-base);
}

.navbar--scrolled {
  box-shadow: 0 4px 24px rgba(0,0,0,0.5);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  width: 100%;
}

/* Brand */
.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  text-decoration: none;
}

.navbar__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.navbar__brand-name {
  font-size: var(--text-sm);
  font-weight: var(--fw-bold);
  color: var(--color-text-on-dark);
}

.navbar__brand-sub {
  font-size: var(--text-xs);
  color: var(--color-text-on-dark-2);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Links */
.navbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.navbar__link {
  position: relative;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-on-dark-2);
  background: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: var(--font-sans);
  text-decoration: none;
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.navbar__link:hover {
  color: var(--color-text-on-dark);
  background: rgba(255,255,255,0.07);
}

/* Underline animato che scorre da sinistra a destra */
.navbar__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  right: 50%;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: left var(--transition-base), right var(--transition-base);
}

.navbar__link:hover::after {
  left: var(--space-3);
  right: var(--space-3);
}

.navbar__link--active {
  color: #fff;
  font-weight: var(--fw-semibold);
}

.navbar__link--active::after {
  left: var(--space-3);
  right: var(--space-3);
}

.navbar__link--external {
  color: rgba(255,255,255,0.5);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
}
.navbar__link--external:hover { color: rgba(255,255,255,0.9); }
.navbar__link--external::after { display: none; }

/* Azioni destra */
.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.navbar__btn-login {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text-on-dark);
  border: 1.5px solid rgba(255,255,255,0.25);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background var(--transition-fast);
  text-decoration: none;
}
.navbar__btn-login:hover {
  border-color: rgba(255,255,255,0.6);
  background: rgba(255,255,255,0.08);
}

.navbar__btn-register {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--fw-bold);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
  text-decoration: none;
}
.navbar__btn-register:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 4px 14px rgba(232,80,10,0.45);
}

/* Hamburger */
.navbar__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
}
.navbar__hamburger span {
  display: block;
  height: 2px;
  background: var(--color-text-on-dark);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.navbar__hamburger.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar__hamburger.is-active span:nth-child(2) { opacity: 0; }
.navbar__hamburger.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.navbar__mobile-menu {
  display: none;
  position: fixed;
  top: var(--navbar-height);
  left: 0; right: 0;
  background: var(--color-dark-2);
  padding: var(--space-4) var(--space-6);
  flex-direction: column;
  gap: 2px;
  border-bottom: 1px solid var(--color-dark-3);
  z-index: 99;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.navbar__mobile-menu.is-open { display: flex; }

.navbar__mobile-link {
  padding: var(--space-3) var(--space-2);
  font-size: var(--text-base);
  font-weight: var(--fw-medium);
  color: var(--color-text-on-dark-2);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: color var(--transition-fast);
  background: none;
  border-left: none;
  border-right: none;
  border-top: none;
  font-family: var(--font-sans);
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  display: block;
  width: 100%;
}
.navbar__mobile-link:hover { color: var(--color-text-on-dark); }
.navbar__mobile-link:last-of-type { border-bottom: none; }

.navbar__mobile-actions {
  display: flex;
  gap: var(--space-3);
  padding-top: var(--space-3);
}

/* Responsive */
@media (max-width: 900px) {
  .navbar__nav, .navbar__actions { display: none; }
  .navbar__hamburger { display: flex; }
  .navbar__brand-sub { display: none; }
}
@media (max-width: 480px) {
  .navbar__inner { gap: var(--space-4); }
}