/* -------- Navigation bar + hamburger -------- */

/* Frosted Glass Navigation Bar (desktop) */
.nav-bar {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 12px 20px;
  border-radius: 14px;

  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);

  display: flex;
  align-items: center;
  z-index: 10;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

/* Horizontal buttons (desktop) */
.button-container {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

/* Text-only buttons */
.button-container button {
  background: transparent !important;
  border: none !important;
  border-radius: 0 !important;

  color: white;
  font-size: 1.2rem;
  font-weight: 600;

  cursor: pointer;
  padding: 4px 8px;
  white-space: nowrap;
  letter-spacing: 0.3px;
  transition: opacity 0.2s ease;
}

/* Underline for active tab */
.button-container button.active {
  text-decoration: underline;
  text-decoration-thickness: 3px;
  text-underline-offset: 6px;
  background: transparent !important;
}

/* Hover effect */
.button-container button:hover {
  opacity: 0.65;
}

/* Hidden by default on desktop */
.nav-toggle {
  display: none;
}

/* -------- Mobile breakpoint - hamburger + dropdown -------- */
@media (max-width: 800px) {
  /* NAV BAR — mobile */
  .nav-bar {
    position: fixed;
    top: 16px;
    left: 0;
    right: 0;
    height: auto;

    padding: 0 16px;
    background: transparent;
    border: none;
    backdrop-filter: none;

    display: flex;
    justify-content: flex-end; /* hamburger to the RIGHT */
    align-items: center;
    z-index: 10;
  }

  /* HAMBURGER BUTTON — shown on mobile */
  .nav-toggle {
    display: block;
    background: transparent;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    padding: 8px 10px;
    border-radius: 8px;
    transition: background 0.2s ease, transform 0.15s ease;
  }

  .nav-toggle:hover {
    background: rgba(255, 255, 255, 0.15);
  }

  .nav-toggle:active {
    transform: scale(0.9);
  }

  /* DROPDOWN MENU - base closed state */
  .button-container {
    position: absolute;
    top: 60px; /* just below the icon */
    right: 16px;
    left: auto;

    padding: 12px 16px;
    border-radius: 14px;

    background: rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.15);

    flex-direction: column;
    gap: 0.75rem;

    /* animation setup */
    opacity: 0;
    transform: translateY(-6px);
    max-height: 0;
    overflow: hidden;
    pointer-events: none;

    transition: opacity 0.18s ease-out, transform 0.18s ease-out,
      max-height 0.22s ease-out;
  }

  /* WHEN OPEN - fade and slide down */
  .nav-bar.open .button-container {
    opacity: 1;
    transform: translateY(0);
    max-height: 400px; /* big enough for all items */
    pointer-events: auto;
  }

  /* Buttons inside dropdown */
  .button-container button {
    font-size: 1rem;
    padding: 4px 6px;
    text-align: left;
  }
}