:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --success-color: #4cc9f0;
    --danger-color: #f72585;
    --warning-color: #f8961e;
    --info-color: #4895ef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --bg-color: #ffffff;
    --text-color: #333333;
    --card-bg: #ffffff;
    --border-color: #dee2e6;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --card-bg: #1e1e1e;
    --border-color: #333333;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --light-color: #2d2d2d;
    --dark-color: #f8f9fa;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: all 0.3s ease;
}

.navbar, .card, .form-control, .btn {
    transition: all 0.3s ease;
}

.card {
    background-color: var(--card-bg);
    border-color: var(--border-color);
    box-shadow: var(--shadow);
}

.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 80px 0;
    border-radius: 0 0 20px 20px;
}

.tool-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: 100%;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.tool-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.admin-sidebar {
    min-height: calc(100vh - 56px);
    background-color: var(--card-bg);
    border-right: 1px solid var(--border-color);
}

.admin-sidebar .nav-link {
    color: var(--text-color);
    padding: 10px 15px;
    border-radius: 5px;
    margin-bottom: 5px;
}

.admin-sidebar .nav-link:hover, 
.admin-sidebar .nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

.table {
    color: var(--text-color);
}

.theme-toggle {
    cursor: pointer;
}

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .hero-section {
        padding: 50px 0;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
}