/* ================= RESET ================= */
*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial, Helvetica, sans-serif;
  }
  
  /* ================= COLOR SYSTEM ================= */
  :root{
    --black:#1A1A1B;      /* Đen matte */
    --blue:#00439C;       /* Deep Blue */
    --purple:#4B0082;     /* Cosmic */
    --white:#ffffff;
  }
  
  /* ================= BODY ================= */
  body{
    background:var(--black);
    color:var(--white);
  }
  
  /* ================= HEADER ================= */
  .header{
    position:sticky;
    top:0;
    z-index:9999;
    background:rgba(26,26,27,0.9);
    backdrop-filter:blur(10px);
    padding:12px 40px;
    border-bottom:1px solid rgba(255,255,255,0.1);
  }
  
  .nav{
    display:flex;
    justify-content:space-between;
    align-items:center;
  }
  
  .logo{
    font-size:24px;
    font-weight:bold;
    color:var(--white);
  }
  
  .menu{
    list-style:none;
    display:flex;
    gap:20px;
  }
  
  .menu a{
    color:#ccc;
    text-decoration:none;
  }
  
  .menu a.active,
  .menu a:hover{
    color:var(--blue);
  }
  
  /* ================= HERO ================= */
  .hero{
    min-height:100vh;
    background:
      radial-gradient(circle at right, var(--purple), transparent 40%),
      linear-gradient(135deg, var(--black), var(--blue));
    display:grid;
    grid-template-columns:1fr 1fr;
    align-items:center;
    padding:60px;
  }
  
  .hero h1{
    font-size:52px;
  }
  
  .hero p{
    color:#ddd;
  }
  
  /* ================= HERO IMAGE ================= */
  .hero-img img{
    width:100%;
    border-radius:24px;
    filter:drop-shadow(0 0 40px rgba(75,0,130,0.6));
    animation: float 3s ease-in-out infinite;
  }
  
  @keyframes float{
    0%,100%{transform:translateY(0)}
    50%{transform:translateY(-20px)}
  }
  
  /* ================= BUTTON ================= */
  .btn{
    margin-top:20px;
    padding:14px 36px;
    border:none;
    background:linear-gradient(135deg, var(--blue), var(--purple));
    color:var(--white);
    border-radius:30px;
    cursor:pointer;
    transition:.3s;
    box-shadow:0 0 0 rgba(75,0,130,0.7);
  }
  
  .btn:hover{
    transform:scale(1.1);
    box-shadow:0 0 30px rgba(75,0,130,0.9);
  }
  
  /* ================= FEATURES ================= */
/* ================= FEATURES ================= */
.features{
    padding:90px 60px;
    text-align:center;
  }
  
  .features h2{
    font-size:42px;
    margin-bottom:60px;
  }
  
  .feature-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:40px;
  }
  
  /* ================= FEATURE CARD ================= */
  .feature-card{
    background:linear-gradient(145deg, #1f1f22, #151517);
    padding:45px 35px;
    border-radius:22px;
    box-shadow:0 20px 50px rgba(0,0,0,0.7);
    transition:.45s;
    position:relative;
    overflow:hidden;
  }
  
  /* glow effect */
  .feature-card::before{
    content:"";
    position:absolute;
    inset:0;
    background:radial-gradient(circle at top, rgba(75,0,130,.6), transparent 60%);
    opacity:0;
    transition:.4s;
  }
  
  .feature-card:hover::before{
    opacity:1;
  }
  
  .feature-card:hover{
    transform:translateY(-12px) scale(1.05);
    box-shadow:0 0 40px rgba(75,0,130,0.8);
  }
  
  /* icon */
  .feature-card img{
    width:80px;
    margin-bottom:20px;
    filter:drop-shadow(0 0 12px rgba(0,114,206,0.8));
  }
  
  /* text */
  .feature-card h3{
    margin-bottom:12px;
    font-size:20px;
  }
  
  .feature-card p{
    font-size:14px;
    color:#ccc;
    line-height:1.6;
  }
  
  /* ================= RESPONSIVE ================= */
  @media(max-width:900px){
    .feature-grid{
      grid-template-columns:1fr;
    }
  }
  
  
  /* ================= PARALLAX ================= */
/* ================= PARALLAX PS5 GAME ================= */
.parallax{
    min-height:60vh;
    background:
      linear-gradient(
        rgba(26,26,27,0.85),
        rgba(75,0,130,0.55)
      ),
      url("../img/ps5-game.jpg") center / cover no-repeat;
  
    background-attachment: fixed; /* HIỆU ỨNG PARALLAX */
  
    display:flex;
    justify-content:center;
    align-items:center;
  
    text-align:center;
    color:white;
    font-size:36px;
    font-weight:bold;
    letter-spacing:2px;
  }
  
  
  /* ================= FORM ================= */
  .form-group{
    position:relative;
    margin:20px;
  }
  
  .form-group input{
    width:100%;
    padding:10px;
    background:transparent;
    border:1px solid #444;
    color:var(--white);
  }
  
  .form-group label{
    position:absolute;
    left:10px;
    top:50%;
    transform:translateY(-50%);
    background:var(--black);
    padding:0 5px;
    color:#aaa;
    transition:.3s;
  }
  
  .form-group input:focus + label,
  .form-group input:not(:placeholder-shown) + label{
    top:-8px;
    font-size:12px;
    color:var(--purple);
  }
  
  /* ================= TOAST ================= */
  .toast{
    opacity:0;
    color:var(--blue);
    transition:.4s;
  }
  
  .toast.show{
    opacity:1;
  }
  
  /* ================= CONTACT ================= */
  .contact{
    background:url("../img/ps5-console.png") no-repeat right bottom;
    background-size:320px;
  }
  
  /* ================= SWIPER ================= */
  .swiper-slide img{
    width:80px;
    border-radius:50%;
  }
  
  /* ================= RESPONSIVE ================= */
  @media(max-width:768px){
    .hero{
      grid-template-columns:1fr;
      text-align:center;
    }
  
    .feature-grid{
      grid-template-columns:1fr;
    }
  }
  .reviews{
    padding:80px 60px;
    text-align:center;
    background:
      radial-gradient(circle at top, var(--purple), transparent 40%);
  }
  
  .reviews h2{
    font-size:40px;
    margin-bottom:50px;
  }
  
  .review-card{
    background:#222;
    padding:40px 30px;
    border-radius:20px;
    box-shadow:0 15px 40px rgba(0,0,0,0.6);
    transition:.4s;
  }
  
  .review-card:hover{
    transform:translateY(-10px) scale(1.05);
    box-shadow:0 0 40px rgba(75,0,130,0.7);
  }
  
  .review-card img{
    width:80px;
    height:80px;
    border-radius:50%;
    margin-bottom:15px;
    border:2px solid var(--purple);
  }
  
  .review-card h3{
    margin-bottom:10px;
  }
  
  .review-card p{
    font-size:14px;
    color:#ddd;
    margin-bottom:10px;
  }
  
  .stars{
    color:#ffd700;
    font-size:18px;
  }

  
  .review-card{
    background:#222;
    padding:40px 30px;
    border-radius:20px;
    box-shadow:0 15px 40px rgba(0,0,0,0.6);
    transition:.4s;
  }
  
  .review-card:hover{
    transform:translateY(-10px) scale(1.05);
    box-shadow:0 0 40px rgba(75,0,130,0.8);
  }
  
  .review-card img{
    width:80px;
    height:80px;
    border-radius:50%;
    margin-bottom:15px;
    border:2px solid var(--purple);
  }
  
  .review-card p{
    font-size:15px;
    color:#ddd;
    margin-bottom:10px;
  }

  /* ================= REVIEW GRID ================= */
.review-grid{
    display:grid;
    grid-template-columns:repeat(3, 1fr);
    gap:40px;
  }
  
  /* ================= REVIEW CARD ================= */
  .review-card{
    background:#222;
    padding:40px 30px;
    border-radius:20px;
    box-shadow:0 15px 40px rgba(0,0,0,0.6);
    transition:.4s;
  }
  
  .review-card:hover{
    transform:translateY(-12px) scale(1.05);
    box-shadow:0 0 40px rgba(75,0,130,0.8);
  }
  
  .review-card img{
    width:80px;
    height:80px;
    border-radius:50%;
    margin-bottom:15px;
    border:2px solid var(--purple);
    object-fit:cover;
  }
  
  .review-card h3{
    margin-bottom:10px;
  }
  
  .review-card p{
    font-size:14px;
    color:#ddd;
    margin-bottom:10px;
  }
  
  .stars{
    color:#ffd700;
    font-size:18px;
  }
  
  /* ================= RESPONSIVE ================= */
  @media(max-width:900px){
    .review-grid{
      grid-template-columns:1fr;
    }
  }
  /* ================= PRODUCTS ================= */
.products{
    padding:90px 60px;
    text-align:center;
    background:
      radial-gradient(circle at top, var(--blue), transparent 45%);
  }
  
  .products h2{
    font-size:42px;
    margin-bottom:60px;
  }
  
  /* grid */
  .product-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:40px;
  }
  
  /* card */
  .product-card{
    background:linear-gradient(145deg,#1f1f22,#151517);
    padding:40px 30px;
    border-radius:24px;
    box-shadow:0 20px 50px rgba(0,0,0,.7);
    transition:.45s;
    position:relative;
    overflow:hidden;
  }
  
  .product-card::before{
    content:"";
    position:absolute;
    inset:0;
    background:radial-gradient(circle at top, rgba(0,67,156,.6), transparent 60%);
    opacity:0;
    transition:.4s;
  }
  
  .product-card:hover::before{
    opacity:1;
  }
  
  .product-card:hover{
    transform:translateY(-12px) scale(1.05);
    box-shadow:0 0 40px rgba(0,67,156,.9);
  }
  
  /* image */
  .product-card img{
    width:220px;
    margin-bottom:20px;
    filter:drop-shadow(0 0 30px rgba(75,0,130,.6));
  }
  
  /* text */
  .product-card h3{
    margin-bottom:8px;
  }
  
  .product-card p{
    font-size:14px;
    color:#ccc;
    margin-bottom:15px;
  }
  
  .price{
    display:block;
    font-size:22px;
    color:#ffd700;
    font-weight:bold;
    margin-bottom:20px;
  }
  
  /* button */
  .buy{
    width:100%;
  }
  
  /* responsive */
  @media(max-width:900px){
    .product-grid{
      grid-template-columns:1fr;
    }
  }
  .btn{
    display:inline-block;
    text-align:center;
    text-decoration:none;
  }
  .product-card{
    display:block;
    text-decoration:none;
    color:inherit;
    cursor:pointer;
  }
  
  .product-card:hover{
    transform:translateY(-10px) scale(1.05);
    box-shadow:0 0 40px rgba(75,0,130,0.7);
  }
  
  .product-card .btn{
    pointer-events:none; /* click vào đâu cũng chuyển */
  }