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

body {
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0f172a, #1e293b);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.app {
    text-align: center;
}

h1 {
    margin-bottom: 20px;
}

.card {
    background: rgba(255,255,255,0.05);
    padding: 25px;
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

button {
    margin: 10px;
    padding: 12px 20px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: white;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    transform: translateY(-2px);
}

.secondary {
    background: #334155;
}

canvas {
    background: #020617;
    border-radius: 12px;
    margin: 15px 0;
}

#scoreboard {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
}

/* POPUP */
.popup {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    justify-content: center;
    align-items: center;
}

.popup-box {
    background: #1e293b;
    padding: 20px;
    border-radius: 12px;
}

.popup-box input {
    width: 100%;
    margin: 10px 0;
    padding: 10px;
    border-radius: 8px;
    border: none;
}