*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    font-family:'Poppins',sans-serif;
    background:#070b18;
    color:white;
    overflow-x:hidden;
}

/* Nền phát sáng */
.background-glow{
    position:fixed;
    inset:0;
    background:
        radial-gradient(circle at 20% 20%,rgba(255,0,170,.30),transparent 35%),
        radial-gradient(circle at 80% 40%,rgba(0,200,255,.25),transparent 35%),
        radial-gradient(circle at 50% 100%,rgba(140,0,255,.25),transparent 45%);
    filter:blur(60px);
    z-index:-1;
}

/* Header */

header{

    display:flex;

    justify-content:space-between;

    align-items:center;

    padding:25px 60px;

}

/* Logo */

.logo{

    display:flex;

    align-items:center;

    gap:15px;

}

.logo-icon{

    width:55px;

    height:55px;

    border-radius:50%;

    display:flex;

    justify-content:center;

    align-items:center;

    font-size:26px;

    font-weight:bold;

    color:white;

    background:linear-gradient(135deg,#ff00a6,#00d9ff);

    box-shadow:
    0 0 15px #ff00a6,
    0 0 35px #00d9ff;

    animation:spinGlow 6s linear infinite;

}

.logo-text{

    font-size:28px;

    font-weight:700;

    letter-spacing:2px;

}

/* Menu */

nav{

    display:flex;

    gap:35px;

}

nav a{

    color:white;

    text-decoration:none;

    transition:.3s;

}

nav a:hover{

    color:#ff59c7;

}

/* Hero */

.hero{

    height:85vh;

    display:flex;

    flex-direction:column;

    justify-content:center;

    align-items:center;

    text-align:center;

}

.hero h1{

    font-size:70px;

    line-height:1.1;

    text-shadow:
    0 0 10px #ff00a6,
    0 0 30px #00d9ff;

}

.hero p{

    margin-top:20px;

    color:#bfbfbf;

    font-size:20px;

}

/* Buttons */

.buttons{

    margin-top:40px;

    display:flex;

    gap:20px;

}

button{

    padding:15px 40px;

    border:none;

    border-radius:40px;

    cursor:pointer;

    font-size:18px;

    color:white;

    background:linear-gradient(135deg,#ff00a6,#00d9ff);

    box-shadow:
    0 0 20px rgba(255,0,166,.5);

    transition:.3s;

}

button:hover{

    transform:translateY(-6px) scale(1.05);

    box-shadow:
    0 0 35px rgba(0,217,255,.7);

}

/* Animation */

@keyframes spinGlow{

0%{

transform:rotate(0deg);

}

100%{

transform:rotate(360deg);

}

}.popup{
    display:none;
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background:rgba(0,0,0,.6);
    justify-content:center;
    align-items:center;
}

.popup-content{
    background:#15152b;
    padding:30px;
    border-radius:15px;
    text-align:center;
    color:white;
    min-width:300px;
}

.popup-content button{
    margin-top:20px;
    padding:10px 20px;
    border:none;
    border-radius:10px;
    cursor:pointer;
}