:root {
    --primary-color: #0d6efd;
    --dark-color: #212529;
    --light-color: #f8f9fa;
    --border-color: #dee2e6;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
    background-color: #fff;
}

html, body {
    height: 100%;
}

header {
    border-bottom: 3px solid var(--primary-color);
}

header h1 {
    font-weight: 700;
    letter-spacing: 0.5px;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

article {
    line-height: 1.6;
}

figure {
    margin: 0;
}

dl dt {
    font-weight: 600;
    margin-top: 0.5rem;
}

dl dd {
    margin-left: 1.5rem;
    margin-bottom: 0.5rem;
}

.card {
    border: 1px solid var(--border-color);
    transition: box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.15) !important;
}

.card-header {
    font-weight: 600;
    border-bottom: 2px solid rgba(255,255,255,0.1);
}

.card-preview {
    border: 2px solid var(--border-color);
    border-radius: 0.375rem;
    background-color: #ffffff;
    overflow: auto;
    position: relative;
    transition: all 0.3s ease;
}

.card-preview div, 
.card-preview p, 
.card-preview img {
    position: relative;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
    margin: 5px;
    display: inline-block;
}

.card-preview div:hover,
.card-preview p:hover,
.card-preview img:hover {
    border-color: #ffc107;
    box-shadow: 0 0 8px rgba(255, 193, 7, 0.5);
}

.card-preview .selected {
    border: 2px solid #0d6efd !important;
    box-shadow: 0 0 12px rgba(13, 110, 253, 0.7) !important;
    outline: 2px dashed #0d6efd;
    outline-offset: -4px;
}

#card div {
    box-sizing: border-box;
}

.card-element {
    padding: 5px;
}

.card-preview img {
    max-width: 100%;
    height: auto;
    display: block;
}

.form-control, .form-select {
    border: 1px solid var(--border-color);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: #333;
}

.input-group .form-control-color {
    cursor: pointer;
    height: 38px;
}

.input-group-text {
    background-color: var(--light-color);
    border: 1px solid var(--border-color);
    font-weight: 500;
    font-family: 'Courier New', monospace;
}

.btn {
    font-weight: 600;
    transition: all 0.3s ease;
    border-radius: 0.375rem;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: #0b5ed7;
    border-color: #0a58ca;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(13, 110, 253, 0.3);
}

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

.btn-warning {
    background-color: #ffc107;
    border-color: #ffc107;
    color: #000;
}

.btn-warning:hover {
    background-color: #ffb800;
    border-color: #ffb300;
    transform: translateY(-2px);
}

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

.btn-outline-secondary:hover {
    transform: translateY(-2px);
}

fieldset {
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    padding: 1rem;
    background-color: #f9f9f9;
}

legend {
    width: auto;
    padding: 0 0.5rem;
    font-size: 0.95rem;
}

footer {
    border-top: 2px solid var(--border-color);
    margin-top: auto;
}

footer h6 {
    font-weight: 700;
    margin-bottom: 0.5rem;
}

footer p {
    margin: 0;
}

.bg-light {
    background-color: var(--light-color) !important;
}

.bg-light h6 {
    color: var(--primary-color);
    font-weight: 700;
}

.bg-light ul {
    list-style-position: inside;
    padding-left: 0;
}

.bg-light li {
    margin-bottom: 0.5rem;
}

.text-muted {
    color: #6c757d !important;
}

.small {
    font-size: 0.875rem;
}

.technology-card {
    padding: 2rem 1rem;
    background-color: var(--light-color);
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.technology-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(13, 110, 253, 0.15);
}

.tech-logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.technology-card:hover .tech-logo {
    transform: scale(1.1);
}

.technology-card h5 {
    font-weight: 700;
    color: var(--dark-color);
}

@media (max-width: 991.98px) {
    .card-preview {
        min-height: 300px !important;
    }
    
    main {
        padding: 1rem 0.5rem;
    }
}

@media (max-width: 576px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    fieldset {
        padding: 0.75rem;
    }
    
    .row g-4 {
        --bs-gutter-x: 1rem;
        --bs-gutter-y: 1rem;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeIn 0.3s ease-out;
}

.form-control:focus,
.form-select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-color);
}

::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #999;
}