/* ========== RESET & BASE ========== */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html, body {
      width: 100%;
      height: 100%;
      overflow: hidden;
      background: #0a0a0a;
      font-family: 'Inter', sans-serif;
      touch-action: pan-x pan-y;
      overscroll-behavior: none;
      -webkit-tap-highlight-color: transparent;
    }

    /* ========== LOGO ========== */
    .logo {
      position: fixed;
      top: 20px;
      left: 20px;
      z-index: 1000;
      transition: all 0.4s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    }
    .logo:hover {
      transform: scale(1.05);
      filter: drop-shadow(0 0 12px rgba(255,215,0,0.5));
    }
    .logo img {
      width: 50px;
      height: auto;
      filter: drop-shadow(0 4px 12px rgba(0,0,0,0.4));
      transition: all 0.3s ease;
    }
    
    /* ========== SECTIONS ========== */
    .section {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      will-change: transform;
      transition: transform 0.8s cubic-bezier(0.2, 0.9, 0.4, 1.2);
      overflow: hidden;
    }

    /* ========== HORIZONTAL SLIDER ========== */
    .horizontal {
      display: flex;
      width: 300%;
      height: 100%;
      will-change: transform;
      transition: transform 0.6s cubic-bezier(0.25, 0.95, 0.4, 1.1);
    }
    
    .slide {
      flex: 0 0 100vw;
      height: 100%;
      background-size: cover;
      background-position: center;
      position: relative;
      transition: transform 0.4s ease;
    }
    
    /* Overlay tối hơn để text nổi, có hiệu ứng chuyển */
    .slide::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, 
        rgba(0,0,0,0.25) 0%,
        rgba(0,0,0,0.7) 100%);
      pointer-events: none;
      transition: opacity 0.5s ease;
    }
    
    /* Hiệu ứng zoom nhẹ cho ảnh nền khi chuyển slide */
    .horizontal {
      transition: transform 0.6s cubic-bezier(0.25, 0.95, 0.4, 1.1);
    }
    
    .slide {
      transition: transform 0.3s ease;
    }

    /* ========== HERO TITLE - HIỆU ỨNG MỚI ========== */
    .hero-title {
      position: absolute;
      top: 30%;
      left: 6%;
      transform: translateY(-50%) translateX(30px);
      opacity: 0;
      z-index: 20;
      color: #fff;
      font-family: 'Playfair Display', serif;
      text-shadow: 0 8px 30px rgba(0,0,0,0.5);
      pointer-events: none;
      transition: transform 0.9s cubic-bezier(0.2, 0.9, 0.4, 1.2), opacity 0.8s ease;
      max-width: 85%;
    }

    .section.active .hero-title {
      transform: translateY(-50%) translateX(0);
      opacity: 1;
    }
    
    .hero-index {
      display: block;
      font-size: 0.75rem;
      letter-spacing: 5px;
      font-weight: 300;
      margin-bottom: 12px;
      opacity: 0.8;
      font-family: 'Inter', sans-serif;
      transition: all 0.3s ease;
    }
    
    .hero-text {
      font-size: clamp(2.2rem, 8vw, 5.8rem);
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.02em;
      transition: all 0.3s ease;
    }
    
    .hero-text small {
      font-size: 0.4em;
      font-weight: 400;
      display: block;
      margin-top: 8px;
      letter-spacing: 1px;
      opacity: 0.9;
    }
    

    /* ========== SWIPE INDICATOR - HIỆU ỨNG MỚI ========== */
    .swipe-down {
      position: absolute;
      left: 50%;
      bottom: 125px;
      transform: translateX(-50%);
      z-index: 25;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      color: rgba(255,255,255,0.9);
      font-size: 9px;
      font-weight: 500;
      letter-spacing: 2.5px;
      pointer-events: none;
      transition: opacity 0.4s ease, transform 0.4s ease;
    }
    
    .swipe-down .mouse-icon {
      width: 24px;
      height: 38px;
      border: 1.8px solid rgba(255,255,255,0.7);
      border-radius: 18px;
      position: relative;
      transition: all 0.3s ease;
    }
    
    .swipe-down .mouse-icon::before {
      content: '';
      position: absolute;
      top: 7px;
      left: 50%;
      transform: translateX(-50%);
      width: 2.5px;
      height: 7px;
      background: white;
      border-radius: 2px;
      animation: scrollWheel 1.6s infinite;
    }
    
    @keyframes scrollWheel {
      0% { opacity: 1; transform: translateX(-50%) translateY(0); }
      75% { opacity: 0.3; transform: translateX(-50%) translateY(10px); }
      100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    }
    
    .swipe-down span {
      font-size: 9px;
      letter-spacing: 2px;
      transition: all 0.3s ease;
    }
    
    .swipe-down.hidden {
      opacity: 0;
      transform: translateX(-50%) translateY(15px);
      pointer-events: none;
    }
    
    @media (max-width: 768px) {
      .swipe-down { bottom: 220px; }
    }

    /* ========== INFO BOX - HIỆU ỨNG MỚI ========== */
    .info-box {
      position: absolute;
      right: 5%;
      bottom: 18%;
      width: 330px;
      max-width: 88%;
      z-index: 30;
      font-family: 'Inter', sans-serif;
    }
    
    
    
    /* Nút toggle */
    .toggle-title {
      background: rgba(0, 0, 0, 0.75);
      backdrop-filter: blur(24px);
      border-radius: 60px;
      padding: 14px 24px;
      text-align: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 0.85rem;
      letter-spacing: 1.8px;
      color: #fff;
      border: 1px solid rgba(255,215,0,0.4);
      transition: all 0.35s cubic-bezier(0.2, 0.9, 0.4, 1.1);
      font-family: 'Inter', sans-serif;
      box-shadow: 0 12px 28px rgba(0,0,0,0.4);
    }
    
    .toggle-title:hover {
      background: rgba(255,215,0,0.85);
      color: #0a0a0a;
      border-color: rgba(255,215,0,0.9);
      transform: translateY(-2px);
      box-shadow: 0 18px 35px rgba(0,0,0,0.5);
    }
    
    .toggle-title:active {
      transform: scale(0.97);
    }
    
    .toggle-title i {
      margin-right: 10px;
      color: #ffd966;
      transition: all 0.3s ease;
    }
    
    .toggle-title:hover i {
      color: #0a0a0a;
    }
    
    /* Nội dung */
    .toggle-content {
      max-height: 0;
      opacity: 0;
      overflow: hidden;
      transform: translateY(-12px);
      transition: max-height 0.6s cubic-bezier(0.33, 1, 0.68, 1), 
                  opacity 0.5s ease, 
                  transform 0.5s ease;
      background: rgba(8, 8, 12, 0.96);
      backdrop-filter: blur(32px);
      margin-top: 12px;
      border-radius: 28px;
      padding: 0 22px;
      border: 1px solid rgba(255,215,0,0.3);
      box-shadow: 0 25px 45px rgba(0,0,0,0.6);
    }
    
    .info-box.active .toggle-content {
      max-height: 550px;
      opacity: 1;
      transform: translateY(0);
      padding: 22px 22px;
    }
    
    .toggle-content h4 {
      font-size: 0.68rem;
      letter-spacing: 1.8px;
      font-weight: 700;
      text-transform: uppercase;
      color: #ffd966;
      margin: 16px 0 6px 0;
      transition: all 0.3s ease;
    }
    
    .toggle-content h4:first-of-type {
      margin-top: 0;
    }
    
    .toggle-content p {
      font-size: 0.82rem;
      color: #f0f3fc;
      line-height: 1.55;
      font-weight: 400;
      transition: all 0.3s ease;
    }
    
    .feature-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255,215,0,0.18);
      border-radius: 40px;
      padding: 5px 14px;
      font-size: 0.68rem;
      margin-bottom: 12px;
      color: #ffeaaf;
      font-weight: 500;
      transition: all 0.3s ease;
    }
    
    .feature-badge:hover {
      background: rgba(255,215,0,0.3);
      transform: translateX(3px);
    }
    
    .story-quote {
      border-left: 3px solid #ffd966;
      padding-left: 14px;
      margin: 14px 0;
      font-style: italic;
      font-size: 0.82rem;
      color: #e0e6f0;
      transition: all 0.3s ease;
    }
    
    .story-quote:hover {
      border-left-width: 4px;
      padding-left: 16px;
    }

    /* ========== BUTTONS - HIỆU ỨNG MỚI ========== */
    .buttons {
      position: absolute;
      bottom: 50px;
      left: 50%;
      transform: translateX(-50%) translateY(40px);
      opacity: 0;
      display: flex;
      gap: 18px;
      z-index: 20;
      transition: transform 0.7s cubic-bezier(0.2, 0.9, 0.4, 1), opacity 0.6s ease;
      width: auto;
    }
    
    .section.active .buttons {
      transform: translateX(-50%) translateY(0);
      opacity: 1;
    }
    
    .buttons a {
      padding: 15px 32px;
      background: transparent;
      backdrop-filter: blur(12px);
      border: 1.2px solid rgba(255,255,255,0.6);
      color: white;
      text-decoration: none;
      border-radius: 50px;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 1.2px;
      transition: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1.1);
      font-family: 'Inter', sans-serif;
      white-space: nowrap;
      cursor: pointer;
      position: relative;
      overflow: hidden;
    }
    
    /* Hiệu ứng ripple cho buttons */
    .buttons a::before {
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      width: 0;
      height: 0;
      border-radius: 50%;
      background: rgba(255,255,255,0.3);
      transform: translate(-50%, -50%);
      transition: width 0.5s, height 0.5s;
    }
    
    .buttons a:active::before {
      width: 200px;
      height: 200px;
    }
    
    .buttons a:first-child {
      background: rgba(255,215,0,0.9);
      border-color: #ffd966;
      color: #0a0a0a;
    }
    
    .buttons a:first-child:hover {
      background: #ffd966;
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 12px 28px rgba(255,215,0,0.3);
    }
    
    .buttons a:last-child:hover {
      background: rgba(255,255,255,0.25);
      transform: translateY(-3px) scale(1.02);
      border-color: rgba(255,255,255,0.9);
    }
    
    .buttons a:active {
      transform: scale(0.97);
    }
    
    @media (max-width: 550px) {
      .toggle-content p {
        font-size: 0.78rem;
      }
      .toggle-content h4 {
        font-size: 0.65rem;
      }
      .info-box.active .toggle-content {
        padding: 18px 18px;
      }
    }

    @media (max-width: 768px) {
      .logo img { width: 60px; }
      .logo { top: 28px; left: 32px; }

      .hero-title {
      position: absolute;
      top: 30%;
      left: 6%;
      transform: translateY(-50%) translateX(30px);
      opacity: 0;
      z-index: 20;
      color: #fff;
      font-family: 'Playfair Display', serif;
      text-shadow: 0 8px 30px rgba(0,0,0,0.5);
      pointer-events: none;
      transition: transform 0.9s cubic-bezier(0.2, 0.9, 0.4, 1.2), opacity 0.8s ease;
      max-width: 85%;
      }
      .hero-index {
        font-size: 0.65rem;
        letter-spacing: 4px;
      }
      .hero-text {
      font-size: clamp(2rem, 10vw, 3.5rem);  /* to hơn bình thường */
      }

      .buttons {
        bottom: 25px;
        gap: 20px;
      }
      .buttons a {
        padding: 14px 28px;
        font-size: 0.9rem;
        font-weight: 600;
        letter-spacing: 1.5px;
        min-width: 140px;
        text-align: center;
      }
      
      .info-box {
        right: 50%;
        transform: translateX(50%);
        bottom: 12%;
        width: 92%;
        max-width: 360px;
      }
    }
    
    /* Hiệu ứng loading cho chuyển cảnh */
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    
    .section.active .hero-title {
      animation: fadeInUp 0.8s ease forwards;}