:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --accent-color: #4cc9f0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
}

body {
    background-color: #f5f7ff;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--dark-color);
    padding-top: 20px;
}

.card {
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
    border: none;
    margin-bottom: 20px;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card-header {
    background-color: var(--primary-color);
    color: white;
    border-radius: 12px 12px 0 0 !important;
    padding: 15px 20px;
    font-weight: 600;
}

.form-control,
.form-select {
    border-radius: 8px;
    padding: 10px 15px;
    border: 1px solid #e1e5ee;
    transition: all 0.3s;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.25rem rgba(67, 97, 238, 0.25);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 8px;
    padding: 10px 20px;
    transition: all 0.3s;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    transform: translateY(-2px);
}

.ratio-display {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1.5rem;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
    transition: all 0.5s ease;
    overflow: hidden;
    position: relative;
}

.ratio-display::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    z-index: 1;
}

.ratio-display span {
    position: relative;
    z-index: 2;
}

.preset-info {
    background-color: white;
    border-radius: 8px;
    padding: 15px;
    margin-top: 15px;
    border-left: 4px solid var(--primary-color);
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.preset-info h5 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.input-group-text {
    background-color: #e9ecef;
    border: 1px solid #e1e5ee;
    border-radius: 8px;
}

.category-badge {
    background-color: var(--accent-color);
    color: white;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-right: 5px;
    display: inline-block;
    margin-bottom: 5px;
}

h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
    font-weight: 700;
}

.subtitle {
    text-align: center;
    color: #6c757d;
    margin-bottom: 40px;
    font-size: 1.1rem;
}

.form-label {
    font-weight: 600;
    margin-bottom: 8px;
    color: #495057;
}

.input-group {
    margin-bottom: 15px;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: #6c757d;
    font-size: 0.9rem;
}