:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --dark-color: #212529;
    --light-color: #f8f9fa;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f6fa;
    color: #333;
    line-height: 1.6;
}

.main-content {
    min-height: calc(100vh - 200px);
    padding-bottom: 2rem;
}

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

.navbar-brand {
    font-weight: 700;
    font-size: 1.4rem;
}

.bg-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-section {
    padding: 4rem 0;
    margin-bottom: 2rem;
}

.hero-section h1 {
    font-weight: 800;
    line-height: 1.2;
}

.feature-card {
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.feature-icon {
    transition: transform 0.3s ease;
}

.feature-icon:hover {
    transform: scale(1.1);
}

.card {
    border-radius: 12px;
    border: none;
    transition: box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.15) !important;
}

.card-header {
    border-bottom: 2px solid #e9ecef;
    font-weight: 600;
}

.btn {
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

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

.form-control {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

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

.form-label {
    color: #495057;
    margin-bottom: 0.5rem;
}

.table {
    font-size: 0.9rem;
}

.table thead th {
    border-bottom: 2px solid #dee2e6;
    font-weight: 600;
    white-space: nowrap;
}

.table tbody tr {
    transition: background-color 0.2s ease;
}

.table-hover tbody tr:hover {
    background-color: rgba(13, 110, 253, 0.05);
}

.badge {
    font-weight: 500;
    padding: 0.4em 0.8em;
}

.list-group-item {
    border-left: none;
    border-right: none;
    transition: background-color 0.2s ease;
}

.list-group-item:first-child {
    border-top: none;
}

.list-group-item:last-child {
    border-bottom: none;
}

.list-group-item:hover {
    background-color: #f8f9fa;
}

.pagination {
    border-radius: 8px;
}

.page-link {
    border-radius: 8px;
    margin: 0 2px;
    color: var(--primary-color);
}

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

.alert {
    border-radius: 8px;
    border: none;
}

.keyword-pill {
    transition: all 0.2s ease;
}

.keyword-pill:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

footer {
    margin-top: auto;
}

footer a {
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover {
    color: #fff !important;
}

.dropdown-menu {
    border-radius: 12px;
    border: none;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.dropdown-item {
    border-radius: 6px;
    margin: 2px 5px;
    transition: all 0.2s ease;
}

.dropdown-item:hover {
    background-color: var(--primary-color);
    color: white;
}

.btn-group .btn {
    border-radius: 0;
}

.btn-group .btn:first-child {
    border-radius: 8px 0 0 8px;
}

.btn-group .btn:last-child {
    border-radius: 0 8px 8px 0;
}

@media (max-width: 768px) {
    .hero-section {
        padding: 2rem 0;
        text-align: center;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .feature-card {
        animation: none;
        margin-top: 2rem;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .navbar-brand {
        font-size: 1.2rem;
    }
    
    .table {
        font-size: 0.8rem;
    }
    
    .card-body {
        padding: 1rem;
    }
}

@media (max-width: 576px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .btn-group {
        display: flex;
        flex-direction: column;
    }
    
    .btn-group .btn {
        border-radius: 8px;
        margin-bottom: 0.5rem;
    }
    
    .btn-group .btn:last-child {
        border-radius: 8px;
        margin-bottom: 0;
    }
    
    .d-flex.gap-2 {
        flex-direction: column;
    }
    
    .d-flex.gap-2 .btn {
        width: 100%;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 1400px;
    }
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a1a1a1;
}

.animate-fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.card-animate {
    animation: slideUp 0.5s ease-out;
}

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