/* ==========================================================================
   Learning Components
   ========================================================================== */

/* ===== Container ===== */
.learning-container {
    height: 100%;
    overflow-y: auto;
}

/* ===== Progress Bar ===== */
.learning-progress-bar {
    flex: 1;
    min-width: 100px;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.learning-progress-bar-sm {
    height: 3px;
}

.learning-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    border-radius: var(--radius-full);
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    width: 0%;
}

.learning-progress-text {
    font-size: 0.78rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.learning-actions {
    display: flex;
    gap: var(--space-xs);
}

/* ===== Buttons ===== */
.learning-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 18px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.88rem;
    font-weight: 500;
    transition: all 0.2s ease;
    line-height: 1.4;
}

.learning-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.learning-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    box-shadow: none;
}

.learning-btn-primary {
    background: var(--accent-blue);
    color: #ffffff;
    border-color: var(--accent-blue);
    font-weight: 600;
}

.learning-btn-primary:hover {
    background: var(--accent-blue-light);
    border-color: var(--accent-blue-light);
}

.learning-btn-sm {
    padding: 6px 10px;
    font-size: 0.8rem;
}

.learning-btn-icon {
    font-size: 2.25rem;
    padding: 6px 12px;
    line-height: 1;
}

.learning-btn-back {
    padding: 6px 12px;
    font-weight: 500;
}

.learning-btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    padding: 4px 8px;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
}

.learning-btn-close:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.learning-btn-danger {
    color: var(--accent-red);
}

.learning-btn-danger:hover {
    border-color: var(--accent-red);
    background: var(--accent-red-bg);
}

.learning-btn-danger-fill {
    background: var(--accent-red);
    color: #ffffff;
    border-color: var(--accent-red);
    font-weight: 600;
}

.learning-btn-danger-fill:hover {
    opacity: 0.9;
}

/* ===== Groups ===== */
.learning-groups {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.learning-group {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-card);
    transition: box-shadow 0.2s ease;
}

.learning-group:hover {
    box-shadow: var(--shadow-md);
}

.learning-group--locked {
    opacity: 0.5;
}

.learning-group--locked .learning-group-title {
    color: var(--text-muted);
}

.learning-group--locked .learning-level-card {
    cursor: not-allowed;
}

.learning-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0 calc(-1 * var(--space-lg)) var(--space-md);
    padding: var(--space-sm) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: var(--top-bar-height);
    background: var(--bg-secondary);
    z-index: 10;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.learning-group-title {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.learning-group-progress {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.learning-group-stars {
    color: var(--accent-amber);
    font-size: 0.85rem;
}

.learning-group-description {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0 0 var(--space-sm);
    line-height: 1.5;
}

.learning-levels {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: var(--space-sm);
}

/* ===== Level Cards ===== */
.learning-level-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-sm);
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.learning-level-card:hover:not(.locked) {
    border-color: var(--accent-blue);
    background: var(--accent-blue-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
}

.learning-level-card.locked {
    opacity: 0.4;
    cursor: not-allowed;
}

.learning-level-card.completed {
    border-color: var(--accent-green);
    background: var(--accent-green-bg);
}

.learning-level-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.learning-level-name {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.3;
    font-weight: 500;
}

.learning-level-stars {
    color: var(--accent-amber);
    font-size: 0.85rem;
    letter-spacing: 2px;
}

.learning-level-stars .empty {
    color: var(--text-dim);
}

/* ===== Level Detail ===== */
.learning-level-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.learning-level-header h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
}

.learning-level-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    line-height: 1.75;
    box-shadow: var(--shadow-card);
}

.learning-level-content h1 {
    font-size: 1.35rem;
    color: var(--text-primary);
    margin: var(--space-lg) 0 var(--space-sm);
    font-weight: 700;
}

.learning-level-content h2 {
    font-size: 1.12rem;
    color: var(--accent-blue);
    margin: var(--space-md) 0 var(--space-sm);
    font-weight: 600;
}

.learning-level-content h3 {
    font-size: 0.98rem;
    color: var(--text-primary);
    margin: var(--space-md) 0 var(--space-xs);
    font-weight: 600;
}

.learning-level-content p {
    margin: var(--space-sm) 0;
    color: var(--text-secondary);
}

.learning-level-content ul,
.learning-level-content ol {
    margin: var(--space-sm) 0 var(--space-sm) var(--space-lg);
    color: var(--text-secondary);
}

.learning-level-content li {
    margin: var(--space-xs) 0;
}

.learning-level-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.learning-level-content span[style*="color:"] strong,
.learning-level-content span[style*="color:"] em {
    color: inherit;
}

.learning-level-content code {
    background: var(--bg-tertiary);
    padding: 2px 7px;
    border-radius: var(--radius-sm);
    font-size: 0.88em;
    border: 1px solid var(--border-color);
}

.learning-level-content pre {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin: var(--space-sm) 0;
    overflow-x: auto;
}

.learning-level-content pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.85em;
    line-height: 1.6;
}

.learning-level-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: var(--space-lg) 0;
}

.learning-level-content del {
    color: var(--text-muted);
}

.learning-level-content a {
    color: var(--accent-blue);
    text-decoration: underline;
    text-decoration-color: var(--accent-blue-bg);
    text-underline-offset: 2px;
    transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

.learning-level-content a:hover {
    color: var(--accent-blue-light);
    text-decoration-color: var(--accent-blue-light);
}

.learning-level-content a:visited {
    color: var(--text-muted);
}

.learning-level-content a:active {
    color: var(--accent-blue-light);
}

.learning-level-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

[data-theme="clinical"] .learning-level-content img {
    background: #ffffff;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
}

.learning-level-content blockquote {
    border-left: 3px solid var(--accent-blue);
    padding: var(--space-sm) var(--space-md);
    margin: var(--space-sm) 0;
    background: var(--accent-blue-bg);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
}

.learning-level-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-md) 0;
    font-size: 0.92rem;
}

.learning-level-content th,
.learning-level-content td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

.learning-level-content th {
    color: var(--text-primary);
    font-weight: 600;
    background: var(--bg-tertiary);
}

.learning-level-content th:first-child { border-radius: var(--radius-sm) 0 0 0; }
.learning-level-content th:last-child { border-radius: 0 var(--radius-sm) 0 0; }

.learning-level-footer {
    display: flex;
    justify-content: center;
    padding: var(--space-lg) 0 var(--space-sm);
}

/* ===== Quiz ===== */
.learning-quiz-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.learning-quiz-progress {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

#quiz-progress-text {
    font-size: 0.82rem;
    color: var(--text-muted);
    white-space: nowrap;
    font-weight: 500;
}

.learning-quiz-body {
    flex: 1;
    overflow-y: auto;
    animation: fadeIn 0.3s ease;
}

.learning-quiz-question {
    font-size: 1.05rem;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    line-height: 1.6;
    font-weight: 500;
}

.learning-quiz-footer {
    display: flex;
    justify-content: center;
    padding: var(--space-lg) 0 var(--space-sm);
    gap: var(--space-sm);
}

/* ===== Choice Options ===== */
.learning-choice-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.learning-choice-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.92rem;
    color: var(--text-secondary);
}

.learning-choice-option:hover {
    border-color: var(--border-hover);
    background: var(--bg-hover);
}

.learning-choice-option.selected {
    border-color: var(--accent-blue);
    background: var(--accent-blue-bg);
    color: var(--text-primary);
}

.learning-choice-option.correct {
    border-color: var(--accent-green);
    background: var(--accent-green-bg);
    color: var(--accent-green);
}

.learning-choice-option.incorrect {
    border-color: var(--accent-red);
    background: var(--accent-red-bg);
    color: var(--accent-red);
}

.learning-choice-radio {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
    transition: border-color 0.2s;
}

.learning-choice-option.selected .learning-choice-radio {
    border-color: var(--accent-blue);
}

.learning-choice-option.selected .learning-choice-radio::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 8px;
    height: 8px;
    background: var(--accent-blue);
    border-radius: 50%;
}

.learning-choice-option.correct .learning-choice-radio {
    border-color: var(--accent-green);
}

.learning-choice-option.correct .learning-choice-radio::after {
    background: var(--accent-green);
}

.learning-choice-option.incorrect .learning-choice-radio {
    border-color: var(--accent-red);
}

.learning-choice-option.incorrect .learning-choice-radio::after {
    background: var(--accent-red);
}

/* ===== Text-Select ===== */
.learning-text-select {
    font-size: 1.02rem;
    line-height: 2.2;
    color: var(--text-secondary);
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.learning-text-blank {
    display: inline-block;
    min-width: 90px;
    padding: 2px 12px;
    background: var(--bg-tertiary);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-sm);
    text-align: center;
    cursor: pointer;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.9em;
    transition: all 0.2s ease;
    vertical-align: middle;
}

.learning-text-blank.filled {
    border-style: solid;
    border-color: var(--accent-blue);
    background: var(--accent-blue-bg);
    color: var(--accent-blue);
}

.learning-text-blank.correct {
    border-color: var(--accent-green);
    color: var(--accent-green);
    background: var(--accent-green-bg);
}

.learning-text-blank.incorrect {
    border-color: var(--accent-red);
    color: var(--accent-red);
    background: var(--accent-red-bg);
}

.learning-word-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.learning-word-option {
    padding: 6px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    font-weight: 500;
}

.learning-word-option:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: var(--accent-blue-bg);
}

.learning-word-option.used {
    opacity: 0.25;
    cursor: not-allowed;
}

/* ===== Drag-Drop ===== */
.learning-drag-instruction {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    font-weight: 500;
}

.learning-drag-container {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.learning-drag-items,
.learning-drag-targets {
    flex: 1;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.learning-drag-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.learning-drag-item {
    padding: 10px 14px;
    background: var(--accent-blue-bg);
    border: 1px solid var(--accent-blue);
    border-radius: var(--radius-md);
    cursor: grab;
    font-size: 0.88rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
    user-select: none;
    touch-action: none;
    font-weight: 500;
}

.learning-drag-item:hover {
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.learning-drag-item:active,
.learning-drag-item.dragging {
    opacity: 0.7;
    cursor: grabbing;
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    background-image: none;
}

.learning-drag-item.placed {
    opacity: 0.25;
    cursor: default;
    transform: none;
    box-shadow: none;
}

.learning-drag-item.drag-touch-clone {
    border-radius: var(--radius-md);
    background: var(--accent-blue-bg);
    border: 1px solid var(--accent-blue);
}

.learning-drag-target {
    padding: 10px 14px;
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    font-size: 0.88rem;
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.learning-drag-target.drag-over {
    border-color: var(--accent-blue);
    background: var(--accent-blue-bg);
}

.learning-drag-target.filled {
    border-style: solid;
    border-color: var(--accent-blue);
    color: var(--text-primary);
    background: var(--accent-blue-bg);
}

.learning-drag-target.correct {
    border-color: var(--accent-green);
    color: var(--accent-green);
    background: var(--accent-green-bg);
}

.learning-drag-target.incorrect {
    border-color: var(--accent-red);
    color: var(--accent-red);
    background: var(--accent-red-bg);
}

.learning-drag-target-label {
    color: var(--text-muted);
    font-size: 0.82rem;
}

.learning-drag-target-value {
    color: var(--accent-blue);
    font-weight: 600;
}

.learning-drag-remove {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0 4px;
}

.learning-drag-hint {
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--accent-blue-bg);
    border-left: 3px solid var(--accent-blue);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.82rem;
    color: var(--text-muted);
    font-style: italic;
}

/* ===== Feedback ===== */
.learning-feedback {
    margin-top: var(--space-md);
    padding: 14px var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    line-height: 1.5;
    animation: slideUp 0.3s ease;
}

.learning-feedback.correct {
    background: var(--accent-green-bg);
    border: 1px solid var(--accent-green);
    color: var(--accent-green);
}

.learning-feedback.incorrect {
    background: var(--accent-red-bg);
    border: 1px solid var(--accent-red);
    color: var(--accent-red);
}

/* ===== Results ===== */
.learning-results-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 350px;
    text-align: center;
    gap: var(--space-md);
    animation: fadeIn 0.4s ease;
    padding: var(--space-xl) 0;
}

.learning-results-content h3 {
    color: var(--text-primary);
    font-size: 1.4rem;
    font-weight: 700;
}

.learning-stars {
    display: flex;
    gap: var(--space-md);
}

.learning-star {
    font-size: 3rem;
    color: var(--text-dim);
    transition: all 0.5s;
}

.learning-star.earned {
    color: var(--accent-amber);
    filter: drop-shadow(0 0 8px rgba(245, 158, 11, 0.4));
    animation: scalePop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.learning-score {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.learning-score-pct {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-blue);
    line-height: 1;
}

.learning-results-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    justify-content: center;
    margin-top: var(--space-md);
}

/* ===== Image Lightbox ===== */
.learning-lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
    touch-action: none;
}

.learning-lightbox:active {
    cursor: grabbing;
}

.learning-lightbox img {
    width: 95vw;
    height: 95vh;
    object-fit: contain;
    transform-origin: 0 0;
    transition: none;
    user-select: none;
    -webkit-user-select: none;
    background: #ffffff;
    border-radius: var(--radius-sm);
}

.learning-lightbox-close {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: #ffffff;
    font-size: 2rem;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    cursor: pointer;
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: background 0.15s ease;
}

.learning-lightbox-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

.learning-level-content img {
    cursor: zoom-in;
}

/* ===== Modals ===== */
.learning-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-overlay);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: var(--space-lg);
    animation: fadeIn 0.2s ease;
}

.learning-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    max-width: 420px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

.learning-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.learning-modal-header h3 {
    color: var(--text-primary);
    font-size: 1.05rem;
    font-weight: 600;
}

.learning-modal-body {
    padding: var(--space-lg);
}

.learning-modal-body p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    font-size: 0.9rem;
    line-height: 1.5;
}

.learning-share-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.learning-share-btn {
    width: 100%;
    justify-content: center;
}

.learning-qr-container {
    display: flex;
    justify-content: center;
    padding: var(--space-md);
    background: var(--qr-bg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.learning-qr-container svg {
    max-width: 200px;
    max-height: 200px;
}

.learning-share-link-display {
    font-size: 0.72rem;
    color: var(--text-dim);
    word-break: break-all;
    text-align: center;
    padding: var(--space-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-family: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;
}

/* ===== Modal Footer ===== */
.learning-modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border-color);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .learning-header {
        flex-wrap: wrap;
    }

    .learning-levels {
        grid-template-columns: 1fr;
    }

    .learning-level-card {
        flex-direction: row;
        text-align: left;
        gap: var(--space-sm);
    }

    .learning-drag-container {
        flex-direction: column;
    }

    .learning-level-content {
        padding: var(--space-md);
    }

    .learning-group {
        padding: var(--space-md);
    }

    .learning-group-header {
        margin: 0 calc(-1 * var(--space-md)) var(--space-sm);
        padding: var(--space-sm) var(--space-md);
    }
}

@media (max-width: 480px) {
    .learning-level-card {
        padding: var(--space-sm);
    }

    .learning-modal {
        max-width: 100%;
        border-radius: var(--radius-md);
    }

    .learning-results-content {
        padding: var(--space-lg) 0;
    }

    .learning-star {
        font-size: 2.2rem;
    }

    .learning-score-pct {
        font-size: 2rem;
    }
}