/* Mobile-First Custom Styles */

/* Base styles for mobile */
body {
    font-size: 16px;
    line-height: 1.6;
}

/* Presentation Cards */
.presentation-card {
    transition: all 0.3s ease;
    border: 1px solid var(--bs-border-color);
    background: var(--bs-body-bg);
}

.presentation-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1) !important;
    border-color: var(--bs-primary);
}

.presentation-icon {
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.presentation-card:hover .presentation-icon {
    opacity: 1;
}

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

.btn-lg {
    padding: 12px 24px;
    font-size: 1.1rem;
}

/* Card enhancements */
.card {
    border-radius: 12px;
    border: 1px solid var(--bs-border-color-translucent);
}

.card-header {
    border-radius: 12px 12px 0 0 !important;
    border-bottom: 1px solid var(--bs-border-color-translucent);
}

/* Empty state styling */
.empty-state-icon {
    opacity: 0.5;
}

/* Form improvements */
.form-control {
    border-radius: 8px;
    padding: 12px 16px;
    border: 1px solid var(--bs-border-color);
    transition: all 0.3s ease;
}

.form-control:focus {
    box-shadow: 0 0 0 3px rgba(var(--bs-primary-rgb), 0.25);
    border-color: var(--bs-primary);
}

/* Navbar improvements */
.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
}

/* Table improvements */
.table {
    --bs-table-bg: transparent;
}

.table tbody tr:hover {
    background-color: var(--bs-secondary-bg);
}

/* Loading states */
.btn:disabled {
    opacity: 0.6;
}

/* File input styling */
.form-control[type="file"] {
    padding: 8px 12px;
}

/* Alert improvements */
.alert {
    border-radius: 10px;
    border: none;
}

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

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

/* Responsive improvements */
@media (max-width: 576px) {
    .display-4 {
        font-size: 2rem;
    }
    
    .lead {
        font-size: 1rem;
    }
    
    .btn-group .btn {
        padding: 6px 8px;
        font-size: 0.875rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .navbar-brand {
        font-size: 1.1rem;
    }
    
    /* Stack table actions vertically on mobile */
    .table .btn-group {
        display: flex;
        flex-direction: column;
        gap: 2px;
    }
    
    .table .btn-group .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Tablet improvements */
@media (min-width: 768px) {
    .presentation-card {
        max-height: 300px;
    }
    
    .container {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

/* Desktop improvements */
@media (min-width: 992px) {
    .presentation-card:hover {
        transform: translateY(-5px);
    }
}

/* Touch improvements for mobile */
@media (hover: none) and (pointer: coarse) {
    .presentation-card:hover {
        transform: none;
    }
    
    .btn {
        min-height: 44px; /* Minimum touch target size */
        padding: 12px 20px;
    }
    
    .nav-link {
        padding: 12px 16px;
    }
}

/* Dark mode specific improvements */
[data-bs-theme="dark"] .presentation-card {
    background: var(--bs-gray-900);
    border-color: var(--bs-gray-700);
}

[data-bs-theme="dark"] .presentation-card:hover {
    border-color: var(--bs-primary);
    background: var(--bs-gray-800);
}

[data-bs-theme="dark"] .empty-state-icon {
    color: var(--bs-gray-600);
}

/* Focus improvements for accessibility */
.btn:focus,
.form-control:focus,
.nav-link:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(var(--bs-primary-rgb), 0.25);
}

/* Loading spinner for file uploads */
.upload-loading .fas {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Presentation meta information styling */
.presentation-meta {
    background: var(--bs-secondary-bg);
    border-radius: 6px;
    padding: 0.75rem;
    margin: 0.5rem 0;
}

/* Badge improvements */
.badge {
    font-weight: 500;
    padding: 0.5em 0.75em;
    border-radius: 6px;
}

/* Footer styling */
footer {
    margin-top: auto;
}