/* =========================
   PHÒNG BIỂU DIỄN – MOBILE RESPONSIVE
   ========================= */

/* ===== MOBILE ≤ 768px ===== */
@media (max-width: 768px) {

  /* ===== HAMBURGER TOGGLE ===== */
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    left: 12px;
    top: 0;
    height: var(--nav-h);
    font-size: 26px;
    color: var(--accent);
    cursor: pointer;
    z-index: 600;
  }

 /* ===== NAVBAR ===== */
  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
    padding: 0 12px;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 500;
    background: rgb(11 8 6 / 0%);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid rgba(197,191,101,0.3);
  }

  .nav-toggle {
    font-size: 28px;
    color: var(--accent);
    cursor: pointer;
    z-index: 600;
  }

  .navbar ul {
    flex-direction: column;
    position: fixed;
    top: 60px;
    left: 0;
    width: 220px;
    height: calc(100vh - 60px);
    background: rgba(11,8,6,0.95);
    padding-top: 20px;
    gap: 0;
    border-right: 1px solid rgba(197,191,101,0.3);
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 550;
  }

  .navbar ul.show { transform: translateX(0); }

  .navbar a {
    display: block;
    font-size: 16px;
    padding: 12px 20px;
    color: var(--accent);
    border-bottom: 1px solid rgba(197,191,101,0.15);
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }

  .navbar a:hover,
  .navbar a.active {
    background: rgba(197,191,101,0.15);
    color: #fff;
  }


  /* ===== TITLE ===== */
  h1.title {
    font-size: 48px;
    margin: 80px 10px 20px;
    line-height: 1.2;
    text-align: center;
  }

  /* ===== ROOMS GRID ===== */
  .rooms {
    display: grid;
    grid-template-columns: 1fr; /* mobile 1 cột */
    gap: 16px;
    padding: 20px 5%;
  }

  /* ===== ROOM CARD ===== */
  .room-card {
    cursor: pointer;
    border-radius: 10px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: rgba(11,8,6,0.2);
    transition: transform 0.2s;
  }

  .room-card:hover {
    transform: translateY(-3px);
  }

  /* Ảnh chiếm toàn bộ card, giữ tỉ lệ */
  .room-card img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    display: block;
  }

  /* Tiêu đề dưới ảnh */
  .room-card h3 {
    margin: 10px 0;
    padding: 0 10px 12px 10px;
    font-size: 1.2rem;
    text-align: center;
    color: #fff;
  }

  /* BACK BUTTON */
  .back-btn {
    position: fixed;
    bottom: 16px;
    left: 16px;
    font-size: 14px;
    padding: 8px 16px;
    z-index: 600;
  }
}

/* ===== SMALL MOBILE ≤ 420px ===== */
@media (max-width: 420px) {

  h1.title {
    font-size: 36px;
    margin: 60px 10px 16px;
  }

  .navbar ul {
    width: 160px;
  }

  .navbar a {
    font-size: 14px;
    padding: 6px 8px;
  }

  .rooms {
    gap: 12px;
    padding: 15px 5%;
  }

  .room-card h3 {
    font-size: 1rem;
  }

  .back-btn {
    font-size: 13px;
    padding: 6px 12px;
  }
}