/* Professional Light Theme */
:root {
    --primary: #007bff;
    --primary-hover: #0056b3;
    --secondary: #6c757d;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    --info: #17a2b8;
    --light: #f8f9fa;
    --dark: #343a40;
    --background: #ffffff;
    --text: #212529;
    --border: #dee2e6;
    --shadow: rgba(0, 0, 0, 0.1);
}

/* Base Styles */
body {
    background-color: var(--background);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

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

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

/* Navbar Styling */
.navbar {
    background-color: var(--background) !important;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 4px var(--shadow);
}

.navbar-brand {
    color: var(--primary) !important;
    font-weight: 700;
    font-size: 1.5rem;
}

.navbar-nav .nav-link {
    color: var(--text) !important;
    font-weight: 500;
}

.navbar-nav .nav-link:hover {
    color: var(--primary) !important;
}

/* Brand Logo Styling */
.brand-logo {
    max-height: 250px;
    width: auto;
    filter: drop-shadow(2px 2px 4px var(--shadow));
    transition: transform 0.3s ease;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.025em;
    margin-bottom: 1rem;
    color: var(--text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }

/* Card Styling */
.card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 4px 6px var(--shadow);
    transition: box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 25px var(--shadow);
}

.card-header {
    background: var(--light);
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    color: var(--text);
}

.card-body {
    padding: 2rem;
}

/* Button Styling */
.btn {
    padding: 0.75rem 2rem;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
    text-transform: none;
}

.btn-xl {
    padding: 1.25rem 3rem;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.4);
    color: white;
}

.btn-secondary {
    background-color: var(--secondary);
    color: white;
    box-shadow: 0 4px 15px rgba(108, 117, 125, 0.3);
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108, 117, 125, 0.4);
    color: white;
}

.btn-success {
    background-color: var(--success);
    color: white;
}

.btn-success:hover {
    background-color: #218838;
    color: white;
}

.btn-danger {
    background-color: var(--danger);
    color: white;
}

.btn-danger:hover {
    background-color: #c82333;
    color: white;
}

/* Form Styling */
.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border: 2px solid var(--border);
    background: var(--background);
    color: var(--text);
    font-size: 1rem;
    border-radius: 8px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-label {
    color: var(--text);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.form-text {
    color: var(--secondary);
    font-size: 0.875rem;
}

/* Table Styling */
.table {
    border-collapse: separate;
    border-spacing: 0;
    color: var(--text);
    background: var(--background);
}

.table th {
    background-color: var(--light);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--border);
    color: var(--text);
}

.table td, .table th {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.02);
}

/* Alert Styling */
.alert {
    border-radius: 8px;
    border: 1px solid transparent;
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.alert-success {
    background-color: rgba(40, 167, 69, 0.1);
    color: #155724;
    border-color: rgba(40, 167, 69, 0.2);
}

.alert-danger {
    background-color: rgba(220, 53, 69, 0.1);
    color: #721c24;
    border-color: rgba(220, 53, 69, 0.2);
}

.alert-warning {
    background-color: rgba(255, 193, 7, 0.1);
    color: #856404;
    border-color: rgba(255, 193, 7, 0.2);
}

.alert-info {
    background-color: rgba(23, 162, 184, 0.1);
    color: #0c5460;
    border-color: rgba(23, 162, 184, 0.2);
}

/* Badge Styling */
.badge {
    font-weight: 600;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
}

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

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

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

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

/* Utility Classes */
.shadow-sm {
    box-shadow: 0 1px 2px 0 var(--shadow);
}

.shadow {
    box-shadow: 0 4px 6px -1px var(--shadow);
}

.shadow-lg {
    box-shadow: 0 10px 25px -3px var(--shadow);
}

.rounded-lg {
    border-radius: 0.5rem;
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

/* Container and Layout */
.container {
    max-width: 1200px;
}

.mt-4 {
    margin-top: 1.5rem !important;
}

.mb-4 {
    margin-bottom: 1.5rem !important;
}

.mb-3 {
    margin-bottom: 1rem !important;
}

/* Advertisement Styling */
.ad-link {
    display: block;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.ad-link:hover {
    transform: scale(1.02);
}

.ad-image {
    border: 1px solid var(--border);
    box-shadow: 0 2px 4px var(--shadow);
    transition: box-shadow 0.3s ease;
}

.ad-image:hover {
    box-shadow: 0 4px 8px var(--shadow);
}

/* Responsive Utilities */
@media (max-width: 768px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .brand-logo {
        max-height: 200px;
    }

    .card-body {
        padding: 1.5rem;
    }

    .btn {
        padding: 0.625rem 1.5rem;
        font-size: 0.9rem;
    }

    .ad-image {
        max-height: 170px;
    }
}

@media (min-width: 769px) {
    .ad-image {
        max-width: 600px;
        height: auto;
    }
}