body {
    margin: 0;
    padding: 0;
    font-family: Arial;
    background: linear-gradient(135deg, #1e1e2f, #3a3a5a);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Khung chính */
.container {
    width: 100%;
    max-width: 350px;
}

/* Box login */
.box {
    background: rgba(255,255,255,0.1);
    padding: 30px;
    border-radius: 15px;
    backdrop-filter: blur(10px);
    text-align: center;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
}

/* Title */
.box h2 {
    color: white;
    margin-bottom: 20px;
}

/* Input */
.box input {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: none;
    border-radius: 10px;
    outline: none;
}

/* Button */
.box button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    background: #00c6ff;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: 0.3s;
}

.box button:hover {
    background: #0072ff;
}

/* Link */
.box a {
    color: #00c6ff;
    text-decoration: none;
}body {
    background: #0f172a;
    color: white;
    font-family: Arial;
    text-align: center;
}

/* TOP */
.top {
    background: #020617;
    padding: 15px;
}

/* GAME BOX */
.game-box {
    margin-top: 50px;
}

/* BUTTON */
button {
    padding: 15px 25px;
    margin: 10px;
    border: none;
    border-radius: 10px;
    background: #1e293b;
    color: white;
    cursor: pointer;
    transition: 0.3s;
}

/* PLAY BTN */
.play {
    background: #00c6ff;
}

/* HOVER */
button:hover {
    transform: scale(1.1);
}

/* INPUT */
input {
    padding: 10px;
    border-radius: 10px;
    border: none;
    margin-top: 10px;
}