body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
}

.card {
    border-radius: 1rem;
}

#result-box {
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%) !important;
}

input[type="number"] {
    border-radius: 0.5rem;
    padding: 0.75rem;
    border: 1px solid #e2e8f0;
}

input[type="number"]:focus {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    border-color: #6366f1;
}

/* iOSでのズーム防止のため、フォントサイズを16px以上に設定 */
input[type="number"], .form-control {
    font-size: 16px !important;
}

.preset-btn {
    min-width: 80px;
}

.display-4 {
    font-size: 3.5rem;
}

.playpoint-link {
    transition: all 0.2s ease;
    border: 1px solid rgba(255,255,255,0.1);
}

.playpoint-link:hover {
    background-color: rgba(255,255,255,0.35) !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* スマホ向けの微調整 */
@media (max-width: 576px) {
    .display-4 {
        font-size: 2.5rem;
    }
}