/* === Core Theme Variables === */
:root {
    --bg-color: #f8f9fa;
    --text-color: #343a40;
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --link-color: #0056b3;
    --link-hover-color: #007bff;
    --card-bg-color: #ffffff;
    --card-border-color: #e9ecef;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --border-color: #dee2e6;
    --text-color-invert: 0;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
}

.light-theme {
    /* Light theme overrides can be added here if needed */
}

.dark-theme {
    --bg-color: #212529;
    --text-color: #f8f9fa;
    --primary-color: #66b3ff;
    --secondary-color: #adb5bd;
    --link-color: #90d4ff;
    --link-hover-color: #66b3ff;
    --card-bg-color: #343a40;
    --card-border-color: #495057;
    --shadow-color: rgba(255, 255, 255, 0.08);
    --border-color: #495057;
    --text-color-invert: 1;
    --success-color: #5cb85c;
    --warning-color: #ffda6a;
    --danger-color: #e4606d;
    --info-color: #5bc0de;
}

/* === Base Styles === */
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--link-color);
}

    a:hover {
        color: var(--link-hover-color);
    }

h1, h2, h3, h4, h5, h6 {
    color: var(--text-color);
}

/* === Card Components === */
.card,
.feature-card,
.application-card,
.contact-info-card {
    background-color: var(--card-bg-color);
    border-color: var(--card-border-color);
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* === Text Utilities === */
.text-primary {
    color: var(--primary-color) !important;
}

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

/* === Buttons === */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.btn-outline-light {
    color: var(--text-color);
    border-color: var(--text-color);
}

    .btn-outline-light:hover {
        background-color: var(--text-color);
        color: var(--bg-color);
    }

/* === Misc Utility Classes === */
.bg-light {
    background-color: var(--bg-color) !important;
}

.footer {
    border-top-color: var(--primary-color);
}

.footer-link.active,
.social-icons a:hover {
    color: var(--primary-color) !important;
}

/* === Navbar Styles === */
.navbar {
    min-height: 60px;
    background-color: var(--card-bg-color) !important; /* Solid background */
    box-shadow: 0 2px 4px var(--shadow-color); /* Optional subtle shadow */
}

    .navbar.bg-dark {
        background-color: var(--card-bg-color) !important;
    }

.navbar-brand strong {
    color: var(--text-color) !important;
}

.navbar-brand img {
    vertical-align: middle;
    height: 30px;
}

.navbar-toggler-icon {
    filter: invert(var(--text-color-invert));
}

/* Navbar Item + Link Alignment */
.navbar-nav .nav-item,
.navbar-nav .nav-link {
    display: flex !important;
    align-items: center !important;
    height: 60px;
    padding-top: 0 !important;
    padding-bottom: 0 !important;
}

    .navbar-nav .nav-item:not(:first-child) .nav-link {
        padding-left: 1rem !important;
        color: var(--primary-color) !important;
    }

    .navbar-nav .nav-item:first-child .nav-link {
        margin-top: 0 !important;
        padding-top: 0 !important;
        color: var(--primary-color) !important;
    }

    /* Active NavLink Styling */
    .navbar-nav .nav-link.active {
        background-color: transparent !important;
        color: var(--primary-color) !important;
        font-weight: bold;
    }

/* Theme Toggle Button */
.theme-toggle-btn i {
    font-size: 1.1rem;
    vertical-align: middle;
}

/* === Modern Enhancements === */

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Modern Button Styles */
.btn {
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    padding: 0.625rem 1.25rem;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #5a9fd4);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0056b3, var(--primary-color));
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

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

/* Modern Form Controls */
.form-control, .form-select {
    border-radius: 8px;
    border: 2px solid var(--border-color);
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
    outline: none;
}

/* Container Enhancements */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Gradient Text */
.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Modern Alerts */
.alert {
    border-radius: 12px;
    border: none;
    padding: 1rem 1.25rem;
}

.alert-success {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.1), rgba(92, 184, 92, 0.1));
    color: var(--success-color);
}

.alert-danger {
    background: linear-gradient(135deg, rgba(220, 53, 69, 0.1), rgba(228, 96, 109, 0.1));
    color: var(--danger-color);
}

.alert-warning {
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.1), rgba(255, 218, 106, 0.1));
    color: var(--warning-color);
}

.alert-info {
    background: linear-gradient(135deg, rgba(23, 162, 184, 0.1), rgba(91, 192, 222, 0.1));
    color: var(--info-color);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--link-hover-color);
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.shadow-sm {
    box-shadow: 0 2px 8px var(--shadow-color) !important;
}

.shadow {
    box-shadow: 0 4px 16px var(--shadow-color) !important;
}

.shadow-lg {
    box-shadow: 0 8px 32px var(--shadow-color) !important;
}

.rounded-modern {
    border-radius: 16px !important;
}

.transition-all {
    transition: all 0.3s ease;
}