:root {
    --primary-color: #1e40af;
    --primary-hover-color: #1d4ed8;
    --secondary-color: #475569;
    --accent-color: #3b82f6;
    --success-color: #059669;
    --danger-color: #dc2626;
    --warning-color: #d97706;
    --info-color: #0891b2;
    --text-color: #1e3a8a;
    --text-light-color: #64748b;
    --text-muted-color: #94a3b8;
    --background-color: #ffffff;
    --background-light-color: #f8fafc;
    --border-color: #e2e8f0;
    --footer-background-color: #1e3a8a;
    --footer-text-color: #dbeafe;
    --hero-text-color: #ffffff;
    --font-family: 'Roboto', sans-serif;
}

body {
    font-family: var(--font-family);
    color: var(--text-color);
    background-color: var(--background-light-color);
    line-height: 1.6;
    font-weight: 400;
}

/* Global Link Styles */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-hover-color);
    text-decoration: underline;
}

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

/* Top Info Bar */
.top-info-bar {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%) !important;
    border-bottom: 2px solid var(--primary-color);
}

.top-info-bar .social-links a {
    transition: transform 0.2s ease;
    padding: 4px;
    border-radius: 4px;
}

.top-info-bar .social-links a:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.1);
}

/* Main Header */
.main-header {
    box-shadow: 0 2px 20px rgba(30, 64, 175, 0.1);
    transition: all 0.3s ease;
    z-index: 1020;
}

.main-header.scrolled {
    box-shadow: 0 4px 30px rgba(30, 64, 175, 0.15);
    transform: translateY(-1px);
}

.header-logo {
    max-height: 45px;
    width: auto;
    max-width: 200px;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.header-logo:hover {
    transform: scale(1.05);
}

.navbar-brand-section h1 {
    color: var(--primary-color) !important;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.navbar-brand-section small {
    color: var(--text-light-color);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.75rem;
}

/* Navigation */
.main-navigation .navbar-nav {
    display: flex;
    gap: 1rem;
}

.main-navigation .nav-link {
    color: var(--text-color);
    font-weight: 500;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
    text-decoration: none;
}

.main-navigation .nav-link:hover {
    color: var(--primary-color);
    background: var(--background-light-color);
    transform: translateY(-1px);
}

.main-navigation .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.main-navigation .nav-link:hover::after {
    width: 80%;
}

/* Header Search */
.header-search .input-group {
    box-shadow: 0 2px 10px rgba(30, 64, 175, 0.1);
    border-radius: 25px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.header-search .input-group:focus-within {
    box-shadow: 0 4px 20px rgba(30, 64, 175, 0.2);
    transform: translateY(-2px);
}

.header-search .form-control {
    border: none;
    padding: 0.75rem 1rem;
    border-radius: 25px 0 0 25px;
}

.header-search .form-control:focus {
    box-shadow: none;
    border-color: transparent;
}

.header-search .btn {
    border-radius: 0 25px 25px 0;
    padding: 0.75rem 1.25rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border: none;
    transition: all 0.3s ease;
}

.header-search .btn:hover {
    background: linear-gradient(135deg, var(--primary-hover-color), var(--primary-color));
    transform: scale(1.05);
}

/* Breadcrumbs */
.breadcrumbs-section {
    background: var(--secondary-color) !important;
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb {
    background: transparent;
    margin-bottom: 0;
    padding: 0;
}

.breadcrumb-item {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8) !important;
}

.breadcrumb-item a {
    color: rgba(255, 255, 255, 0.9) !important;
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb-item a:hover {
    color: white !important;
}

.breadcrumb-item.active {
    color: rgba(255, 255, 255, 0.7) !important;
    font-weight: 500;
}

/* Main Content */
.main-content {
    background: var(--background-light-color);
    min-height: calc(100vh - 300px);
}

/* Cards */
.card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(30, 64, 175, 0.08);
    transition: all 0.3s ease;
    background: var(--background-color);
    overflow: hidden;
}

.card:hover {
    box-shadow: 0 8px 30px rgba(30, 64, 175, 0.15);
    border-color: var(--primary-color);
}

.card-header {
    background: linear-gradient(135deg, var(--background-light-color), var(--background-color));
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
}

.card-body {
    padding: 1.5rem;
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border: none;
    color: white !important;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.875rem;
    box-shadow: 0 2px 8px rgba(30, 64, 175, 0.2);
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active {
    background: linear-gradient(135deg, var(--primary-hover-color), var(--primary-color)) !important;
    border-color: var(--primary-hover-color) !important;
    box-shadow: 0 4px 15px rgba(30, 64, 175, 0.4) !important;
    color: white !important;
    transform: translateY(-1px);
}

.btn-outline-primary {
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    background: transparent;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(30, 64, 175, 0.3);
}

.btn-secondary {
    background: var(--secondary-color);
    border: none;
    color: white;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--text-color);
    color: white;
}

/* Corporate Cards Layout */
.corporate-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.corporate-card {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.corporate-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.corporate-card:hover::before {
    transform: scaleX(1);
}

.corporate-card:hover {
    box-shadow: 0 12px 40px rgba(30, 64, 175, 0.15);
    border-color: var(--primary-color);
}

/* Corporate Grid Layout */
.corporate-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

.corporate-item {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 1rem;
    overflow: hidden;
}

.corporate-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 20px rgba(30, 64, 175, 0.1);
    background: var(--background-light-color);
}

.corporate-actions {
    min-width: 40px;
}

.corporate-actions .btn {
    min-width: 40px;
    padding: 0.375rem;
}

.corporate-icon {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.corporate-content {
    min-width: 0;
    overflow: hidden;
}

.corporate-content h6 {
    margin: 0 0 0.25rem 0;
    color: var(--text-color);
    font-weight: 600;
}

.corporate-content p {
    margin: 0;
    color: var(--text-light-color);
    font-size: 0.875rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.corporate-content a {
    display: inline-block;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    vertical-align: bottom;
}

/* Hero Section */
.hero-corporate {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    padding: 4rem 0;
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
}

/* Company Page Specific */
.company-hero {
    padding: 3rem 0;
    margin-bottom: 0;
}

.hero-corporate h1, .hero-corporate h2, .hero-corporate p {
    color: var(--homepage-text-color);
}

.company-logo-hero img {
    max-height: 120px;
    max-width: 150px;
    object-fit: contain;
    background: white;
    padding: 1rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.company-logo-placeholder {
    width: 120px;
    height: 120px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.8);
    margin: 0 auto;
}

.company-categories .badge {
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

.company-description {
    background: var(--background-light-color);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    line-height: 1.7;
}

/* Company Sidebar */
.company-mini-logo {
    width: 48px;
    height: 48px;
}

.company-mini-logo img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    background: var(--background-light-color);
    padding: 0.25rem;
    border: 1px solid var(--border-color);
}

.company-logo-placeholder-mini {
    width: 48px;
    height: 48px;
    background: var(--background-light-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted-color);
    font-size: 1.2rem;
}

.sidebar-company-item:hover {
    background: var(--background-light-color);
    border-radius: 8px;
    padding: 0.75rem;
    margin: -0.75rem;
    transition: all 0.2s ease;
}

.company-url-mini {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.hero-corporate::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNDAiIGhlaWdodD0iNDAiIHZpZXdCb3g9IjAgMCA0MCA0MCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48ZGVmcz48cGF0dGVybiBpZD0iZ3JpZCIgd2lkdGg9IjQwIiBoZWlnaHQ9IjQwIiBwYXR0ZXJuVW5pdHM9InVzZXJTcGFjZU9uVXNlIj48cGF0aCBkPSJNIDQwIDAgTCAwIDAgMCA0MCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSJyZ2JhKDI1NSwyNTUsMjU1LDAuMSkiIHN0cm9rZS13aWR0aD0iMSIvPjwvcGF0dGVybj48L2RlZnM+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgZmlsbD0idXJsKCNncmlkKSIvPjwvc3ZnPg==');
    opacity: 0.5;
}

.hero-corporate .container {
    position: relative;
    z-index: 2;
}

.hero-corporate h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-corporate p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

/* Company Cards */
.company-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.company-card {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    position: relative;
}

.company-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(30, 64, 175, 0.15);
    border-color: var(--primary-color);
}

.company-card-header {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    background: linear-gradient(135deg, var(--background-light-color), var(--background-color));
    border-bottom: 1px solid var(--border-color);
}

.company-logo {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-light-color);
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.company-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.company-logo-placeholder {
    color: var(--text-muted-color);
    font-size: 1.5rem;
}

.company-info h5 {
    margin: 0 0 0.25rem 0;
    color: var(--text-color);
    font-weight: 600;
}

.company-info .text-muted {
    color: var(--text-light-color) !important;
    font-size: 0.875rem;
}

.company-card-body {
    padding: 1.5rem;
}

.company-card-footer {
    padding: 1rem 1.5rem;
    background: var(--background-light-color);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Categories */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

/* Category Hierarchy for index page */
.categories-hierarchy {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.category-hierarchy-item {
    border-left: 3px solid var(--primary-color);
    padding-left: 1rem;
    transition: all 0.3s ease;
}

.category-hierarchy-item:hover {
    border-left-color: var(--accent-color);
    background: var(--background-light-color);
    border-radius: 0 8px 8px 0;
    margin: -0.5rem -1rem -0.5rem 0;
    padding: 0.5rem 1rem 0.5rem 1rem;
}

.category-main-item {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
}

.category-main-title {
    display: block;
}

.category-main-title:hover {
    color: var(--primary-hover-color) !important;
    text-decoration: underline !important;
}

.category-children .btn {
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
    border-radius: 20px;
}

.category-children .btn:hover:not(.disabled) {
    box-shadow: 0 2px 8px rgba(30, 64, 175, 0.2);
}

.category-card {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.2s ease;
    overflow: hidden;
}

.category-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 20px rgba(30, 64, 175, 0.1);
}

.category-link {
    display: block;
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.category-icon {
    width: 40px;
    height: 40px;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1rem;
    flex-shrink: 0;
}

.category-title {
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
    font-size: 1rem;
}

.category-count {
    color: var(--text-light-color);
    font-size: 0.875rem;
    margin: 0;
}

/* Badges */
.badge {
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-primary {
    background: var(--primary-color) !important;
    color: white !important;
}

.badge-secondary {
    background: var(--secondary-color) !important;
    color: white !important;
}

.bg-primary-custom {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color)) !important;
    color: white !important;
}

.badge.bg-primary-custom {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color)) !important;
    color: white !important;
    border: none;
}

.badge.bg-primary-custom:hover {
    background: linear-gradient(135deg, var(--primary-hover-color), var(--primary-color)) !important;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
}

.badge-outline {
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.badge-outline:hover {
    background: var(--primary-color);
    color: white;
}

/* Forms */
.form-control {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.75rem;
    transition: all 0.3s ease;
    background: var(--background-color);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(30, 64, 175, 0.1);
    outline: none;
}

.form-label {
    color: var(--text-color);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

/* Form buttons */
form .btn-primary {
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    min-height: 50px;
    margin-top: 1rem;
}

.card form .btn-primary {
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
}

/* Footer */
.site-footer {
    background: linear-gradient(135deg, var(--footer-background-color), var(--secondary-color)) !important;
    border-top: 4px solid var(--primary-color);
}

.footer-section h5,
.footer-section h6 {
    color: var(--footer-text-color);
    font-weight: 600;
}

.footer-section a {
    color: var(--footer-text-color);
    text-decoration: none;
    transition: all 0.3s ease;
    display: block;
    padding: 0.25rem 0;
    font-weight: 500;
    opacity: 0.9;
}

.footer-section a:hover {
    opacity: 1;
    padding-left: 0.5rem;
    color: var(--footer-text-color);
}

.footer-description {
    color: var(--footer-text-color);
    line-height: 1.6;
    font-weight: 400;
    opacity: 0.95;
}

.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--footer-text-color);
    transition: all 0.3s ease;
    text-decoration: none;
}

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    color: var(--footer-text-color);
}

.contact-info .small {
    color: var(--footer-text-color);
    font-weight: 500;
    opacity: 0.9;
}

.site-footer p.small {
    color: var(--footer-text-color);
    opacity: 0.85;
}

/* Pagination */
.pagination .page-link {
    color: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    margin: 0 2px;
    padding: 0.5rem 0.75rem;
    transition: all 0.3s ease;
}

.pagination .page-item.active .page-link {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.pagination .page-link:hover {
    background: var(--background-light-color);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Alerts */
.alert {
    border-radius: 8px;
    border: none;
    padding: 1rem 1.25rem;
}

.alert-primary {
    background: rgba(30, 64, 175, 0.1);
    color: var(--primary-color);
    border-left: 4px solid var(--primary-color);
}

.alert-success {
    background: rgba(5, 150, 105, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .top-info-bar {
        display: none !important;
    }

    .corporate-cards {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .company-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .categories-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 0.75rem;
    }

    .hero-corporate {
        padding: 2rem 0;
        margin-bottom: 1.5rem;
    }

    .hero-corporate h1 {
        font-size: 2rem;
    }

    .hero-corporate p {
        font-size: 1rem;
    }

    .main-navigation .navbar-nav {
        flex-direction: column;
        gap: 0;
    }

    .main-navigation .nav-link {
        padding: 1rem;
        border-radius: 0;
    }

    .corporate-grid {
        grid-template-columns: 1fr;
    }

    .corporate-item {
        padding: 1rem;
        gap: 0.75rem;
    }

    .corporate-actions .btn {
        min-width: 36px;
        padding: 0.25rem;
        font-size: 0.875rem;
    }

    .company-card-header {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
}

@media (max-width: 576px) {
    .categories-grid {
        grid-template-columns: 1fr;
    }

    .corporate-card {
        padding: 1rem;
    }

    .hero-corporate {
        padding: 1.5rem 0;
    }

    .hero-corporate h1 {
        font-size: 1.75rem;
    }
}

/* Sitemap Tree Styles */
.sitemap-tree {
    text-align: left;
}

.tree-item {
    margin-bottom: 1rem;
}

.tree-node {
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
    transition: all 0.2s ease;
}

.tree-node.level-1 {
    font-size: 1rem;
    font-weight: 600;
    border-left: 3px solid var(--primary-color);
    padding-left: 1rem;
    margin-bottom: 0.5rem;
}

.tree-node.level-2 {
    font-size: 0.95rem;
    padding-left: 2rem;
    border-left: 2px solid var(--accent-color);
    margin-left: 1rem;
}

.tree-node.level-3 {
    font-size: 0.9rem;
    padding-left: 2.5rem;
    border-left: 1px solid var(--border-color);
    margin-left: 2rem;
}

.tree-link {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.tree-link:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.tree-children {
    margin-top: 0.5rem;
}

/* Letters Navigation */
.letters-navigation {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(50px, 1fr));
    gap: 0.5rem;
    max-width: 800px;
    margin: 0 auto;
}

.letter-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid var(--border-color);
    background: var(--background-color);
    color: var(--text-light-color);
}

.letter-item.letter-active {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(30, 64, 175, 0.3);
}

.letter-item.letter-active:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(30, 64, 175, 0.4);
    color: white;
    text-decoration: none;
}

.letter-item.letter-disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: var(--background-light-color);
    border-color: var(--border-color);
    color: var(--text-muted-color);
}

/* Utility Classes */
.text-corporate-primary {
    color: var(--primary-color) !important;
}

.text-corporate-secondary {
    color: var(--secondary-color) !important;
}

.text-corporate-muted {
    color: var(--text-light-color) !important;
}

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

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

.border-corporate {
    border-color: var(--border-color) !important;
}

/* Smooth transitions for all interactive elements */
* {
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

/* Focus states for accessibility */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:focus,
.form-control:focus {
    outline: none;
}

/* Custom font size adjustments */
h1.display-4,
h1.h2 {
    font-size: 2rem !important;
}
.lead.mb-4,
.lead.opacity-90,
p.lead,
.alert-info {
    font-size: 1rem !important;
}