/**
 * Flashcard Preview Styles - IELTS LIVIO
 * Additional styles for flashcard preview modals and interactions
 */

/* ========================================
   TEXT READABILITY IMPROVEMENTS
   WCAG 2.1 AA Compliance (4.5:1 contrast ratio)
   ======================================== */

/* Modal Header Text Contrast Enhancement */
.flashcard-preview-modal .modal-header {
    border-bottom: none;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.flashcard-preview-modal .modal-header .modal-title,
.flashcard-preview-modal .modal-header h5 {
    color: #ffffff !important;
    font-weight: 700 !important;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3) !important;
    letter-spacing: 0.025em !important;
}

.flashcard-preview-modal .modal-header .btn-close {
    filter: brightness(0) invert(1) !important;
    opacity: 0.9 !important;
}

/* Statistics Headers on bg-secondary Background */
.flashcard-preview-modal .card-header.bg-primary .mb-0,
.flashcard-preview-modal .card-header.bg-secondary .mb-0,
.flashcard-preview-modal .card-header.bg-success .mb-0,
.flashcard-preview-modal .card-header.bg-warning .mb-0,
.flashcard-preview-modal .card-header.bg-danger .mb-0,
.flashcard-preview-modal .card-header.bg-info .mb-0 {
    color: rgba(255, 255, 255, 0.98) !important;
    font-weight: 700 !important;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4) !important;
    letter-spacing: 0.025em !important;
    font-size: 0.875rem !important;
    text-transform: uppercase !important;
}

/* Metadata Headers on bg-light Background */
.flashcard-preview-modal .card-header.bg-light .mb-0,
.flashcard-preview-modal .card-header.bg-light h5,
.flashcard-preview-modal .card-header.bg-light .card-title {
    color: #1f2937 !important;
    font-weight: 700 !important;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1) !important;
    letter-spacing: 0.025em !important;
}

/* Flashcard Content Text - Enhanced Contrast */
.flashcard:not(.preview-flashcard) .flashcard-front,
.flashcard:not(.preview-flashcard) .flashcard-back,
.preview-flashcard .flashcard-front,
.preview-flashcard .flashcard-back {
    color: #ffffff !important;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4) !important;
}

.preview-flashcard .flashcard-front h4,
.preview-flashcard .flashcard-back h4,
.flashcard:not(.preview-flashcard) .flashcard-front h4,
.flashcard:not(.preview-flashcard) .flashcard-back h4 {
    color: #ffffff !important;
    font-weight: 700 !important;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.5) !important;
    letter-spacing: 0.025em !important;
    line-height: 1.3 !important;
}

/* Pronunciation and Context Sentence Enhancement */
.preview-flashcard .flashcard-front p.pronunciation,
.preview-flashcard .flashcard-back p.pronunciation,
.preview-flashcard .flashcard-front p.context-sentence,
.preview-flashcard .flashcard-back p.context-sentence {
    color: rgba(255, 255, 255, 0.95) !important;
    font-weight: 600 !important;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4) !important;
    font-size: 1rem !important;
    opacity: 1 !important;
}

/* General flashcard paragraph text */
.preview-flashcard .flashcard-front p,
.preview-flashcard .flashcard-back p,
.flashcard:not(.preview-flashcard) .flashcard-front p,
.flashcard:not(.preview-flashcard) .flashcard-back p {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500 !important;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3) !important;
    font-size: 0.95rem !important;
    opacity: 1 !important;
}

/* Small Text and Badge Improvements */
.flashcard-preview-modal .small,
.flashcard-preview-modal .text-muted,
.flashcard-preview-modal .text-muted-light {
    color: #4b5563 !important;
    font-weight: 600 !important;
    opacity: 1 !important;
}

.flashcard-preview-modal .badge {
    font-weight: 700 !important;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2) !important;
    letter-spacing: 0.025em !important;
}

/* Specific badge text colors */
.flashcard-preview-modal .badge.bg-primary,
.flashcard-preview-modal .badge.bg-secondary,
.flashcard-preview-modal .badge.bg-success,
.flashcard-preview-modal .badge.bg-warning,
.flashcard-preview-modal .badge.bg-danger,
.flashcard-preview-modal .badge.bg-info {
    color: rgba(255, 255, 255, 0.98) !important;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3) !important;
}

.flashcard-preview-modal .badge.bg-light,
.flashcard-preview-modal .badge.bg-secondary-light {
    color: #1f2937 !important;
    font-weight: 700 !important;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1) !important;
}

/* Statistics and Data Display Enhancement */
.flashcard-preview-modal .stat-number,
.flashcard-preview-modal .card-body .display-4,
.flashcard-preview-modal .card-body .display-5,
.flashcard-preview-modal .card-body .display-6 {
    color: #1f2937 !important;
    font-weight: 800 !important;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1) !important;
}

.flashcard-preview-modal .stat-label,
.flashcard-preview-modal .card-body .text-secondary,
.flashcard-preview-modal .card-body .text-secondary-light {
    color: #374151 !important;
    font-weight: 600 !important;
    opacity: 1 !important;
}

/* Progress Bar Text Enhancement */
.flashcard-preview-modal .progress-bar {
    color: rgba(255, 255, 255, 0.98) !important;
    font-weight: 700 !important;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3) !important;
    letter-spacing: 0.025em !important;
}

/* Metadata Values Enhancement */
.flashcard-preview-modal .card-body .metadata-value,
.flashcard-preview-modal .card-body .fw-bold,
.flashcard-preview-modal .card-body strong {
    color: #1f2937 !important;
    font-weight: 700 !important;
}

.flashcard-preview-modal .card-body .metadata-label,
.flashcard-preview-modal .card-body .fw-normal {
    color: #374151 !important;
    font-weight: 600 !important;
}

/* Alert and Message Text */
.flashcard-preview-container .alert-info {
    background: rgba(23, 162, 184, 0.15);
    color: #0c5460 !important;
    font-weight: 600 !important;
    border-left: 4px solid #17a2b8;
}

.flashcard-preview-modal .alert,
.flashcard-preview-modal .alert-warning,
.flashcard-preview-modal .alert-danger {
    color: #1f2937 !important;
    font-weight: 600 !important;
}

/* Loading and Error State Text */
.flashcard-preview-loading .spinner {
    border-top-color: var(--primary-color);
}

.flashcard-preview-error {
    background: #fef2f2;
    color: #991b1b !important;
    font-weight: 700 !important;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1) !important;
}

/* Mobile Text Readability Enhancements */
@media (max-width: 768px) {
    .flashcard-preview-modal .modal-header .modal-title,
    .flashcard-preview-modal .modal-header h5 {
        font-size: 1.25rem !important;
        text-shadow: 0 2px 5px rgba(0, 0, 0, 0.4) !important;
    }

    .preview-flashcard .flashcard-front h4,
    .preview-flashcard .flashcard-back h4 {
        font-size: 1.3rem !important;
        text-shadow: 0 2px 6px rgba(0, 0, 0, 0.5) !important;
    }

    .preview-flashcard .flashcard-front p,
    .preview-flashcard .flashcard-back p {
        font-size: 0.9rem !important;
        font-weight: 600 !important;
        text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4) !important;
    }

    .flashcard-preview-modal .badge {
        font-weight: 700 !important;
        text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25) !important;
    }
}

@media (max-width: 576px) {
    .flashcard-preview-modal .modal-header .modal-title,
    .flashcard-preview-modal .modal-header h5 {
        font-size: 1.125rem !important;
    }

    .preview-flashcard .flashcard-front h4,
    .preview-flashcard .flashcard-back h4 {
        font-size: 1.2rem !important;
    }

    .preview-flashcard .flashcard-front p,
    .preview-flashcard .flashcard-back p {
        font-size: 0.875rem !important;
        font-weight: 700 !important;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .flashcard-preview-modal .modal-header .modal-title,
    .flashcard-preview-modal .modal-header h5 {
        text-shadow: 0 2px 6px rgba(0, 0, 0, 0.6) !important;
    }

    .preview-flashcard .flashcard-front h4,
    .preview-flashcard .flashcard-back h4 {
        text-shadow: 0 2px 8px rgba(0, 0, 0, 0.7) !important;
    }

    .preview-flashcard .flashcard-front p,
    .preview-flashcard .flashcard-back p {
        text-shadow: 0 2px 5px rgba(0, 0, 0, 0.6) !important;
        font-weight: 700 !important;
    }
}

/* Flashcard Preview Container */
.flashcard-preview-container {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    min-height: 500px;
    position: relative;
    overflow: hidden;
}

/* Flashcard flip styles for both embedded and standalone modals */
.flashcard:not(.preview-flashcard),
.preview-flashcard {
    width: 100%;
    max-width: 600px;
    height: 300px;
    margin: 20px auto;
    perspective: 1000px;
    cursor: pointer;
    transition: transform var(--transition-base);
}

.flashcard:not(.preview-flashcard):hover,
.preview-flashcard:hover {
    transform: scale(1.02);
}

/* Flashcard content styles for both types */
.flashcard:not(.preview-flashcard) .flashcard-content,
.preview-flashcard .flashcard-content {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    border-radius: var(--radius-xl);
}

.flashcard:not(.preview-flashcard).flipped .flashcard-content,
.preview-flashcard.flipped .flashcard-content {
    transform: rotateY(180deg);
}

.flashcard:not(.preview-flashcard) .flashcard-front,
.preview-flashcard .flashcard-front,
.flashcard:not(.preview-flashcard) .flashcard-back,
.preview-flashcard .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    color: white;
    padding: var(--space-lg);
}

.flashcard:not(.preview-flashcard) .flashcard-front,
.preview-flashcard .flashcard-front {
    background: linear-gradient(135deg, var(--darker-color) 0%, var(--dark-color) 100%);
}

.flashcard:not(.preview-flashcard) .flashcard-back,
.preview-flashcard .flashcard-back {
    transform: rotateY(180deg);
    background: linear-gradient(135deg, var(--success-color) 0%, #059669dd 100%);
}

.preview-flashcard .flashcard-front h4,
.preview-flashcard .flashcard-back h4 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    word-wrap: break-word;
}

.preview-flashcard .flashcard-front p,
.preview-flashcard .flashcard-back p {
    margin: 0.5rem 0;
    opacity: 0.9;
}

/* Modal Enhancements */
.flashcard-preview-modal .modal-dialog {
    max-width: 800px;
}

.flashcard-preview-modal .modal-content {
    border: none;
    border-radius: 15px;
    overflow: hidden;
}

.flashcard-preview-modal .modal-header {
    border-bottom: none;
}

.flashcard-preview-modal .modal-body {
    padding: 0;
}

/* Statistics Cards */
.flashcard-preview-modal .card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.flashcard-preview-modal .card-header {
    border-bottom: none;
    border-radius: 10px 10px 0 0 !important;
}

.flashcard-preview-modal .progress {
    border-radius: 10px;
    overflow: hidden;
}

.flashcard-preview-modal .progress-bar {
    border-radius: 10px;
}

/* Badge Enhancements */
.flashcard-preview-modal .badge {
    font-size: 0.75rem;
    padding: 0.4em 0.8em;
    border-radius: 20px;
}

/* Loading State */
.flashcard-preview-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 400px;
    background: #f8f9fa;
}

.flashcard-preview-loading .spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #e3e3e3;
    border-top: 4px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Error State */
.flashcard-preview-error {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 400px;
    background: #f8d7da;
    color: #721c24;
    text-align: center;
    padding: 2rem;
}

/* Typography and content styles */
.flashcard:not(.preview-flashcard) .flashcard-front h4,
.preview-flashcard .flashcard-front h4,
.flashcard:not(.preview-flashcard) .flashcard-back h4,
.preview-flashcard .flashcard-back h4 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    word-wrap: break-word;
    line-height: 1.3;
}

.flashcard:not(.preview-flashcard) .flashcard-front p,
.preview-flashcard .flashcard-front p,
.flashcard:not(.preview-flashcard) .flashcard-back p,
.preview-flashcard .flashcard-back p {
    margin: var(--space-sm) 0;
    opacity: 0.9;
    font-size: 0.95rem;
    font-style: italic;
}

/* Modal Enhancements */
.flashcard-preview-modal .modal-dialog {
    max-width: 800px;
}

.flashcard-preview-modal .modal-content {
    border: none;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.flashcard-preview-modal .modal-header {
    border-bottom: none;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.flashcard-preview-modal .modal-body {
    padding: 0;
}

/* Statistics Cards */
.flashcard-preview-modal .card {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--space-lg);
    overflow: hidden;
}

.flashcard-preview-modal .card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.flashcard-preview-modal .card-header {
    border-bottom: none;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0 !important;
    background: var(--secondary-color);
    color: white;
}

/* Badge Enhancements */
.flashcard-preview-modal .badge {
    font-size: 0.75rem;
    padding: 0.4em 0.8em;
    border-radius: 20px;
    font-weight: 500;
}

/* Progress bars */
.flashcard-preview-modal .progress {
    border-radius: var(--radius-md);
    overflow: hidden;
    background-color: var(--lighter-color);
    height: 8px;
}

.flashcard-preview-modal .progress-bar {
    border-radius: var(--radius-md);
    background: linear-gradient(90deg, var(--success-color) 0%, var(--info-color) 100%);
    transition: width 0.6s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
    .flashcard-preview-modal .modal-dialog {
        margin: var(--space-md);
        max-width: calc(100% - var(--space-xl));
    }

    .flashcard:not(.preview-flashcard),
    .preview-flashcard {
        height: 250px;
        margin: var(--space-md) var(--space-md) var(--space-lg);
    }

    .flashcard:not(.preview-flashcard) .flashcard-front h4,
    .preview-flashcard .flashcard-front h4,
    .flashcard:not(.preview-flashcard) .flashcard-back h4,
    .preview-flashcard .flashcard-back h4 {
        font-size: 1.2rem;
    }

    .flashcard-preview-modal .modal-content {
        border-radius: var(--radius-lg);
    }

    .flashcard-preview-modal .card {
        border-radius: var(--radius-md);
        margin-bottom: var(--space-md);
    }
}

@media (max-width: 576px) {
    .flashcard:not(.preview-flashcard),
    .preview-flashcard {
        height: 220px;
        margin: var(--space-sm);
    }

    .flashcard:not(.preview-flashcard) .flashcard-front h4,
    .preview-flashcard .flashcard-front h4,
    .flashcard:not(.preview-flashcard) .flashcard-back h4,
    .preview-flashcard .flashcard-back h4 {
        font-size: 1.1rem;
    }

    .flashcard:not(.preview-flashcard) .flashcard-front p,
    .preview-flashcard .flashcard-front p,
    .flashcard:not(.preview-flashcard) .flashcard-back p,
    .preview-flashcard .flashcard-back p {
        font-size: 0.85rem;
    }
}

/* Animation Enhancements */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.flashcard-preview-container > *:not(.preview-flashcard) {
    animation: fadeInUp 0.5s ease-out;
}

/* Hover Effects */
.flashcard-preview-modal .card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
}

/* Flip Instructions */
.flashcard-preview-container .alert-info {
    border: none;
    border-radius: 10px;
    background: rgba(23, 162, 184, 0.1);
    color: #0c5460;
}

/* Touch Support for Mobile */
@media (hover: none) and (pointer: coarse) {
    .preview-flashcard:active {
        transform: scale(0.98);
    }

    .preview-flashcard .flashcard-front,
    .preview-flashcard .flashcard-back {
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .preview-flashcard .flashcard-front,
    .preview-flashcard .flashcard-back {
        border: 2px solid currentColor;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    .preview-flashcard .flashcard-content {
        transition: none;
    }

    .preview-flashcard,
    .flashcard-preview-modal .card {
        transition: none;
    }

    .flashcard-preview-container > *:not(.preview-flashcard) {
        animation: none;
    }
}