/* ============================================================
   NAVBAR — fixed top bar, desktop + mobile responsive
   ============================================================ */

.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* MPEI logo on the left */
.nav-brand img {
  height: 2.6rem;
  width: auto;
}

/* Centered nav links — grow to fill available space */
.nav-links {
  list-style: none;
  flex: 1;
  display: flex;
  justify-content: center;
  gap: 0.25rem;
}

.nav-links a {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--color-tu);
  border-radius: var(--radius);
  transition: background 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(43, 94, 167, 0.08);
}

/* TU Wien logo on the right */
.nav-logo-right,
.nav-logo-right img {
  height: 2.6rem;
  width: auto;
}

/* Hamburger button — hidden on desktop */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: #333;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* Animate hamburger into X when open */
.nav-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---- Mobile layout (≤ 767px) ---- */
@media (max-width: 767px) {

  /* Order: [MPEI logo] ... [TU Wien logo] [hamburger] */
  .nav-links      { order: 1; }   /* pushed into dropdown, flex-order irrelevant here */
  .nav-logo-right { order: 2; margin-left: auto; }
  .nav-toggle     { order: 3; display: flex; }

  /* Dropdown menu slides in below the navbar */
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: center;
    padding: 1rem 0;
    gap: 0;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    text-align: center;
    padding: 0.9rem 1rem;
    border-radius: 0;
    font-size: 1.05rem;
  }
}