/* ==================
    RESPONSIVE 
==================== */

/* 1. Màn hình siêu lớn ≥ 1366px (Desktop 27", laptop 15-17") → 4 cột YouTube */
@media (min-width: 1366px) {
  .songs-youtube-grid {
    gap: 3rem;
    padding: 3rem 1rem;
    max-width: 1400px; /* Optional: allow a bit wider on huge screens */
  }
}

/* 2. iPad Pro ngang, tablet lớn, laptop 13-14" (1024px → 1366px) → ép đúng 3 cột đẹp */
@media (min-width: 1024px) and (max-width: 1366px) {
  .songs-youtube-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
    padding: 2.5rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
  }
}

/* 3. Tablet thường, iPad dọc (dưới 1024px) → 2 cột */
@media (max-width: 1024px) {
  .songs-youtube-grid,
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
  .slides-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 960px) {
  .navbar {
    padding: 1.2rem;
  }
  .nav-menu {
    gap: 1rem;
  }
  .logo p {
    font-size: 1.6rem;
  }
  .hero .super-title {
    font-size: 3.2rem !important;
    line-height: 1.1 !important;
  }

  .hero .super-title span {
    font-size: 2rem !important;
    display: block;
    margin-top: 0.8rem;
    font-weight: 700;
    letter-spacing: 1px;
    opacity: 0.95;
  }
}
@media (max-width: 850px) {
  .nav-menu {
    gap: 0.75rem;
  }
  .logo p {
    font-size: 1.5rem;
  }
}

/* 4. Điện thoại lớn & tablet nhỏ (dưới 768px) → 1 cột */
@media (max-width: 768px) {
  /* Navbar hamburger */
  .hamburger {
    display: block;
    font-size: 2rem;
    cursor: pointer;
    z-index: 1001;
  }
  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 1.5rem 0;
    gap: 1.5rem;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-150%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
    z-index: 999;
  }
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .nav-menu a {
    font-size: 1.3rem;
    padding: 0.5rem 2rem;
    display: block;
  }

  /* Hero nhỏ lại */
  .hero {
    padding: 5rem 1rem 4rem !important;
  }
  .hero h1 {
    font-size: 2.8rem !important;
  }
  .hero p {
    font-size: 1.2rem;
  }
  /* Tất cả grid về 1 cột */
  .grid,
  .gallery-grid,
  .songs-list,
  .mode-options {
    grid-template-columns: 1fr !important;
    gap: 1.8rem;
    margin: 2rem 0;
  }

  .slide-card {
    flex-direction: column;
  }
  .slide-date {
    min-width: auto;
    padding: 1.2rem;
  }
  .links {
    flex-direction: column;
  }
  .btn-youtube,
  .btn-pdf,
  .btn-slide,
  .btn-download {
    width: 100%;
    justify-content: center;
  }
}

/* 5. Điện thoại nhỏ hơn nữa (dưới 480px) */
@media (max-width: 540px) {
  .logo img {
    height: 3.2rem;
    width: 3.2rem;
  }
  .logo p {
    font-size: 1.5rem;
  }

  .hero h1 {
    font-size: 2.4rem !important;
  }
  .hero p {
    font-size: 1.1rem;
  }
  .songs-youtube-grid {
    grid-template-columns: 1fr !important;
    gap: 1.5rem;
    padding: 1.5rem 0.5rem;
  }
  .yt-item {
    border-radius: 14px;
  }
}