:root {
    --neon-blue: #00f2fe;
    --neon-pink: #ff00ff;
    --neon-green: #39ff14;
    --dark-bg: #0a0b1e;
}

body {
    background-color: var(--dark-bg);
    color: white;
    font-family: 'Pretendard', sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

.container {
    width: 95%;
    max-width: 1200px;
    padding: 40px 10px;
    text-align: center;
}

h1 {
    font-size: 3rem;
    color: var(--neon-blue);
    text-shadow: 0 0 10px var(--neon-blue), 0 0 20px var(--neon-blue);
    margin-bottom: 5px;
}

p { color: #aaa; margin-bottom: 40px; }

.pinball-frame {
    margin-bottom: 50px;
}

#generateBtn {
    background: transparent;
    border: 3px solid var(--neon-green);
    color: var(--neon-green);
    padding: 20px 60px;
    font-size: 1.5rem;
    font-weight: 800;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 0 15px var(--neon-green);
    transition: all 0.3s;
    text-transform: uppercase;
}

#generateBtn:hover {
    background: var(--neon-green);
    color: black;
    box-shadow: 0 0 40px var(--neon-green);
    transform: scale(1.1);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(0, 242, 254, 0.3);
    border-radius: 15px;
    padding: 25px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.5) translateY(50px);
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.card.pop {
    opacity: 1;
    transform: scale(1) translateY(0);
}

.card .label {
    font-size: 0.7rem;
    color: var(--neon-pink);
    margin-bottom: 10px;
    font-weight: bold;
}

.card .combination {
    font-size: 1.3rem;
    line-height: 1.6;
}

.card .word-a { color: var(--neon-blue); font-weight: bold; }
.card .word-b { color: white; font-weight: bold; }
.card .operator { margin: 0 10px; color: #555; }

@media (max-width: 600px) {
    h1 { font-size: 2rem; }
    .result-grid { grid-template-columns: 1fr; }
}