/* Custom CSS for Smart Vocabulary App */

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

/* Body and Layout */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
}

.navbar-brand {
    font-weight: bold;
    font-size: 1.25rem;
}

/* Cards */
.card {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    border: 1px solid rgba(0, 0, 0, 0.125);
    transition: box-shadow 0.15s ease-in-out;
}

.card:hover {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.card-header {
    background-color: rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid rgba(0, 0, 0, 0.125);
}

/* Study Page Specific */
.study-card {
    border: 2px solid var(--primary-color);
    border-radius: 15px;
}

.word-display {
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.meaning-display .card {
    border: 2px solid #e9ecef;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.study-btn {
    transition: all 0.2s ease-in-out;
    border-radius: 10px;
    font-size: 0.9rem;
}

.study-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

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

.study-btn i {
    transition: transform 0.2s ease-in-out;
}

.study-btn:hover i {
    transform: scale(1.1);
}

/* Action Buttons Colors */
.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.btn-warning {
    background-color: var(--warning-color);
    border-color: var(--warning-color);
    color: #000;
}

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

/* Progress Bars */
.progress {
    border-radius: 10px;
    overflow: hidden;
}

.progress-bar {
    transition: width 0.6s ease;
}

/* Statistics Page */
.achievement-item {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 15px;
    transition: all 0.2s ease-in-out;
}

.achievement-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.text-gold {
    color: #ffd700 !important;
}

/* Tables */
.table {
    border-radius: 10px;
    overflow: hidden;
}

.table thead th {
    background-color: rgba(var(--bs-primary-rgb), 0.1);
    border: none;
    font-weight: 600;
    color: var(--primary-color);
}

.table-hover tbody tr:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.05);
}

/* Badges */
.badge {
    font-size: 0.75em;
    padding: 0.35em 0.65em;
    border-radius: 0.375rem;
}

/* Buttons */
.btn {
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease-in-out;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.1rem;
    border-radius: 12px;
}

/* Form Controls */
.form-control {
    border-radius: 8px;
    border: 1.5px solid #dee2e6;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

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

.form-select {
    border-radius: 8px;
}

/* Alerts */
.alert {
    border-radius: 10px;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.alert-success {
    background-color: rgba(var(--bs-success-rgb), 0.1);
    color: var(--success-color);
}

.alert-danger {
    background-color: rgba(var(--bs-danger-rgb), 0.1);
    color: var(--danger-color);
}

.alert-info {
    background-color: rgba(var(--bs-info-rgb), 0.1);
    color: var(--bs-info);
}

.alert-warning {
    background-color: rgba(var(--bs-warning-rgb), 0.1);
    color: #664d03;
}

/* Modals */
.modal-content {
    border-radius: 15px;
    border: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.modal-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    border-top-left-radius: 15px;
    border-top-right-radius: 15px;
}

.modal-footer {
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    border-bottom-left-radius: 15px;
    border-bottom-right-radius: 15px;
}

/* Pagination */
.pagination .page-link {
    border-radius: 6px;
    margin: 0 2px;
    border: 1px solid #dee2e6;
    color: var(--primary-color);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .study-btn {
        margin-bottom: 10px;
        padding: 1rem 0.5rem;
    }
    
    .word-display h1 {
        font-size: 2rem;
    }
    
    .navbar-nav {
        text-align: center;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .table-responsive {
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    .container {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    .study-btn {
        font-size: 0.8rem;
        padding: 0.75rem 0.25rem;
    }
    
    .study-btn small {
        font-size: 0.7rem;
    }
}

/* Loading States */
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Dark Theme Adjustments */
[data-bs-theme="dark"] .meaning-display .card {
    background: linear-gradient(135deg, #343a40 0%, #495057 100%);
    border-color: #495057;
    color: #fff;
}

[data-bs-theme="dark"] .achievement-item {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

[data-bs-theme="dark"] .table thead th {
    background-color: rgba(var(--bs-primary-rgb), 0.2);
}

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

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

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #0056b3;
}

/* Utility Classes */
.text-shadow {
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.border-radius-lg {
    border-radius: 12px !important;
}

.border-radius-xl {
    border-radius: 20px !important;
}

.shadow-hover {
    transition: box-shadow 0.15s ease-in-out;
}

.shadow-hover:hover {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15) !important;
}