/* Modern custom styles with smooth transitions */
:root {
    --card-border-radius: 16px;
    --transition-speed: 0.3s;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    background: linear-gradient(135deg, #000000 0%, #000033 50%, #000066 100%);
}

.card {
    border-radius: var(--card-border-radius);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    transition: transform var(--transition-speed) ease;
    border: 1px solid rgba(255,255,255,0.1);
    background: linear-gradient(145deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
}

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

.form-control, .form-select {
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(0,0,0,0.2);
    transition: all var(--transition-speed) ease;
}

.form-control:focus, .form-select:focus {
    box-shadow: 0 0 0 0.25rem rgba(var(--bs-info-rgb), 0.25);
    border-color: rgba(var(--bs-info-rgb), 0.5);
    background: rgba(0,0,0,0.3);
}

.btn {
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--bs-primary) 0%, var(--bs-info) 100%);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--bs-primary-rgb), 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Form section styling */
.form-section {
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: var(--card-border-radius);
    background: rgba(255,255,255,0.03);
}

/* Animation for status area */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

#statusArea {
    animation: fadeIn 0.4s ease-out;
}

/* Custom radio buttons */
.form-check-input {
    cursor: pointer;
}

.form-check-input:checked {
    background-color: var(--bs-info);
    border-color: var(--bs-info);
}

/* Spinner animation */
.spinner-border {
    border-right-color: transparent;
}

/* Alert styling */
.alert {
    border-radius: var(--card-border-radius);
    border: 1px solid rgba(255,255,255,0.1);
}

/* Form text helper */
.form-text {
    font-size: 0.85rem;
    margin-top: 0.4rem;
    opacity: 0.7;
}

.form-label {
    font-size: 1.1rem;
    margin: 1.2rem 0 0.5rem 0;
    font-weight: 500;
}

.mb-3 {
    margin-bottom: 2rem !important;
}


/* Responsive container padding */
@media (min-width: 768px) {
    .container {
        padding: 2rem;
    }
}