:root {
    --bg: #0d1117;
    --card-bg: #161b22;
    --accent: #7c3aed;
    --accent-glow: #a78bfa;
    --text: #e6edf3;
    --text-dim: #8b949e;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--bg);
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    color: var(--text);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

@keyframes pop {
    0% { transform: scale(0.5); opacity: 0; }
    60% { transform: scale(1.3); opacity: 1; }
    100% { transform: scale(1); }
}

.card {
    background: var(--card-bg);
    border: 1px solid #30363d;
    border-radius: 16px;
    padding: 40px;
    width: 90%;
    max-width: 320px;
    text-align: center;
    box-shadow: 0 0 40px rgba(124, 58, 237, 0.15);
    animation: fadeInUp 0.8s ease;
}

.shake {
    animation: shake 0.3s ease;
}

.pop {
    animation: pop 0.6s ease;
}

h1 {
    margin-top: 0;
    font-size: 24px;
    color: var(--accent-glow);
    letter-spacing: 0.5px;
}

p {
    color: var(--text-dim);
}

input {
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 8px;
    color: var(--text);
    padding: 10px 12px;
    font-size: 16px;
    width: 100%;
    margin-bottom: 12px;
}

input:focus {
    outline: none;
    border-color: var(--accent);
}

button {
    background: var(--accent);
    border: none;
    border-radius: 8px;
    color: white;
    padding: 10px 18px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.1s ease;
}

button:hover {
    background: var(--accent-glow);
}

button:active {
    transform: scale(0.97);
}

button:disabled {
    background: #30363d;
    cursor: not-allowed;
}

#message {
    font-size: 18px;
    font-weight: bold;
    color: var(--text);
    min-height: 24px;
}

#stats {
    font-size: 13px;
}

@media (max-width: 380px) {
    .card {
        padding: 24px;
    }
}