* {
    box-sizing: border-box;
}

body {
    font-family: system-ui, sans-serif;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    color: white;
    margin: 0;
    text-align: center;
}

nav {
    margin: 20px 0;
}

nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 15px;
    font-weight: 500;
    opacity: 0.8;
}

nav a:hover {
    opacity: 1;
    text-decoration: underline;
}

.card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 25px;
    margin: 25px auto;
    width: 90%;
    max-width: 650px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

h1 {
    font-size: 2.5rem;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    margin: 8px 0;
}

input {
    padding: 10px;
    border-radius: 8px;
    border: none;
    margin-top: 10px;
    width: 60%;
}

button {
    padding: 10px 20px;
    margin-left: 10px;
    border: none;
    border-radius: 8px;
    background-color: #00c6ff;
    color: black;
    font-weight: bold;
    cursor: pointer;
}

button:hover {
    background-color: #00eaff;
}

.game-box {
    margin-top: 25px;
    padding: 15px;
    border-radius: 12px;
    background: rgba(255,255,255,0.08);
}

#star {
    font-size: 2.5rem;
    cursor: pointer;
    margin: 15px auto;
    transition: transform 0.2s ease;
}

#star:hover {
    transform: scale(1.3) rotate(10deg);
}

footer {
    margin: 30px 0;
    opacity: 0.7;
}