/**
 * Grammar Challenges Styles
 * Phase 3 - Applied Practice exercises
 * Minimalistic design matching sentence-builder, transformation & contextual-completion
 * Pro-only feature
 */

.grammar-challenges {
    max-width: 800px;
    margin: 0 auto;
    font-family: 'Poppins', sans-serif;
}

/* Challenge Type Cards */
.gc-type-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.gc-type-card {
    background: var(--bg-white, #FEFEFE);
    border: 2px solid var(--border-primary, #E8E3DA);
    border-radius: 8px;
    padding: 1.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.gc-type-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.gc-type-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary, #5C6F5C);
    box-shadow: 0 6px 16px rgba(92, 111, 92, 0.15);
}

.gc-type-card:hover::before {
    opacity: 1;
}

.gc-type-card.active {
    border-color: var(--primary, #5C6F5C);
    background: rgba(92, 111, 92, 0.03);
}

.gc-type-card.active::before {
    opacity: 1;
}

.gc-type-card-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-bottom: 1rem;
}

.gc-type-card-icon svg {
    width: 24px;
    height: 24px;
}

.gc-type-card-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-primary, #1A1816);
    margin-bottom: 0.375rem;
}

.gc-type-card-description {
    font-size: 0.8125rem;
    color: var(--text-muted, #9E9689);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.gc-type-card-count {
    font-size: 0.75rem;
    color: var(--text-muted, #9E9689);
}

.gc-type-card-progress {
    margin-top: 1rem;
    height: 4px;
    background: var(--border-primary, #E8E3DA);
    border-radius: 2px;
    overflow: hidden;
}

.gc-type-card-progress-fill {
    height: 100%;
    background: var(--primary, #5C6F5C);
    border-radius: 2px;
    transition: width 0.3s ease;
}

/* Stats Banner */
.gc-stats-banner {
    display: flex;
    justify-content: center;
    gap: 2rem;
    padding: 1.25rem;
    background: linear-gradient(135deg, rgba(92, 111, 92, 0.08) 0%, rgba(92, 111, 92, 0.04) 100%);
    border-radius: 8px;
    margin-bottom: 2rem;
}

.gc-stat-item {
    text-align: center;
}

.gc-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark, #2d5f4d);
}

.gc-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted, #9E9689);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Main Exercise Card */
.gc-exercise-card {
    background: var(--bg-white, #FEFEFE);
    border: 2px solid var(--border-primary, #E8E3DA);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

/* Challenge Badge */
.gc-challenge-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, rgba(92, 111, 92, 0.1) 0%, rgba(92, 111, 92, 0.15) 100%);
    color: var(--primary-dark, #2d5f4d);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.gc-challenge-badge svg {
    width: 14px;
    height: 14px;
}

/* Challenge Header */
.gc-challenge-header {
    margin-bottom: 1.5rem;
}

.gc-challenge-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary, #1A1816);
    margin-bottom: 0.5rem;
}

.gc-challenge-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8125rem;
    color: var(--text-muted, #9E9689);
}

.gc-challenge-meta-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.gc-challenge-meta-item svg {
    width: 14px;
    height: 14px;
}

/* Prompt Display */
.gc-prompt {
    background: var(--bg-cream, #F7F4EF);
    border: 2px solid var(--border-primary, #E8E3DA);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.gc-prompt-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted, #9E9689);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.75rem;
}

.gc-prompt-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary, #3A3633);
    font-family: 'Instrument Serif', Georgia, serif;
}

/* Content Block (for passages/sentences) */
.gc-content-block {
    background: var(--bg-white, #FEFEFE);
    border: 2px solid var(--border-primary, #E8E3DA);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.gc-content-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted, #9E9689);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.625rem;
}

.gc-content-text {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--text-secondary, #3A3633);
}

.gc-content-text .error {
    background: rgba(239, 68, 68, 0.12);
    color: #dc2626;
    padding: 0 0.25rem;
    border-radius: 2px;
}

/* Sentences List (for sentence combining) */
.gc-sentences-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.gc-sentences-list li {
    padding: 0.75rem 1rem;
    background: rgba(92, 111, 92, 0.04);
    border-radius: 6px;
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--text-secondary, #3A3633);
    position: relative;
    padding-left: 2.5rem;
}

.gc-sentences-list li::before {
    content: counter(sentence);
    counter-increment: sentence;
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1.25rem;
    height: 1.25rem;
    background: var(--primary, #5C6F5C);
    color: white;
    border-radius: 50%;
    font-size: 0.6875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gc-sentences-list {
    counter-reset: sentence;
}

/* Answer Input Area */
.gc-answer-area {
    margin-bottom: 1.5rem;
}

.gc-answer-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted, #9E9689);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.gc-answer-input {
    width: 100%;
    min-height: 140px;
    padding: 1rem;
    background: var(--bg-white, #FEFEFE);
    border: 2px solid var(--border-primary, #E8E3DA);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    color: var(--text-secondary, #3A3633);
    resize: vertical;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.gc-answer-input:focus {
    outline: none;
    border-color: var(--primary, #5C6F5C);
    box-shadow: 0 0 0 3px rgba(92, 111, 92, 0.1);
}

.gc-answer-input::placeholder {
    color: var(--text-muted, #9E9689);
}

/* Word Count */
.gc-word-count {
    display: flex;
    justify-content: flex-end;
    font-size: 0.75rem;
    color: var(--text-muted, #9E9689);
    margin-top: 0.5rem;
}

/* Actions */
.gc-actions {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
}

.gc-clear-btn,
.gc-submit-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.gc-clear-btn {
    background: transparent;
    border: 2px solid var(--border-primary, #E8E3DA);
    color: var(--text-muted, #9E9689);
}

.gc-clear-btn:hover:not(:disabled) {
    border-color: #ef4444;
    color: #ef4444;
}

.gc-submit-btn {
    background: var(--primary, #5C6F5C);
    border: 2px solid var(--primary, #5C6F5C);
    color: white;
}

.gc-submit-btn:hover:not(:disabled) {
    background: var(--primary-dark, #2d5f4d);
    border-color: var(--primary-dark, #2d5f4d);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(92, 111, 92, 0.25);
}

.gc-clear-btn:disabled,
.gc-submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Spinner */
.gc-spinner {
    animation: gc-spin 1s linear infinite;
}

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

/* Feedback */
.gc-feedback {
    margin-top: 1.5rem;
}

.gc-feedback.hidden {
    display: none;
}

.gc-feedback-card {
    background: var(--bg-white, #FEFEFE);
    border: 2px solid var(--border-primary, #E8E3DA);
    border-radius: 8px;
    padding: 1.5rem;
}

.gc-feedback-card.correct {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.03);
}

.gc-feedback-card.incorrect {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.03);
}

.gc-feedback-card.partial {
    border-color: #f59e0b;
    background: rgba(245, 158, 11, 0.03);
}

.gc-feedback-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.gc-feedback-title {
    font-size: 1.125rem;
    font-weight: 600;
}

.gc-feedback-title.correct {
    color: #22c55e;
}

.gc-feedback-title.incorrect {
    color: #ef4444;
}

.gc-feedback-title.partial {
    color: #f59e0b;
}

/* Points Display */
.gc-points-earned {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.875rem;
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-left: 0.75rem;
}

.gc-points-earned svg {
    width: 16px;
    height: 16px;
}

/* Score Display */
.gc-scores {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.gc-score-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(92, 111, 92, 0.05);
    border-radius: 6px;
    font-size: 0.875rem;
}

.gc-score-label {
    color: var(--text-muted, #9E9689);
}

.gc-score-value {
    font-weight: 600;
    color: var(--text-primary, #1A1816);
}

.gc-score-value.high {
    color: #22c55e;
}

.gc-score-value.medium {
    color: #f59e0b;
}

.gc-score-value.low {
    color: #ef4444;
}

/* AI Feedback */
.gc-ai-feedback {
    padding: 1rem;
    background: rgba(99, 102, 241, 0.05);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.gc-ai-feedback-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: #6366f1;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.gc-ai-feedback-header svg {
    width: 16px;
    height: 16px;
}

.gc-ai-feedback-text {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary, #3A3633);
}

/* Strengths & Issues Lists */
.gc-feedback-list {
    margin: 0.75rem 0;
    padding-left: 1.25rem;
}

.gc-feedback-list li {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-secondary, #3A3633);
    margin-bottom: 0.375rem;
}

.gc-feedback-list.strengths li::marker {
    color: #22c55e;
}

.gc-feedback-list.issues li::marker {
    color: #ef4444;
}

/* Example Response */
.gc-example-response {
    padding: 1rem;
    background: rgba(34, 197, 94, 0.05);
    border-left: 3px solid #22c55e;
    border-radius: 0 6px 6px 0;
    margin-bottom: 1rem;
}

.gc-example-response-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: #22c55e;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.gc-example-response-text {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary, #3A3633);
}

/* Grammar Tip */
.gc-grammar-tip {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(245, 158, 11, 0.06);
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary, #3A3633);
    margin-bottom: 1rem;
}

.gc-grammar-tip svg {
    color: #f59e0b;
    flex-shrink: 0;
    margin-top: 0.125rem;
}

/* Feedback Actions */
.gc-feedback-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.25rem;
    flex-wrap: wrap;
}

.gc-next-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: var(--primary, #5C6F5C);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.gc-next-btn:hover {
    background: var(--primary-dark, #2d5f4d);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(92, 111, 92, 0.25);
}

.gc-try-again-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: transparent;
    border: 2px solid var(--primary, #5C6F5C);
    border-radius: 8px;
    color: var(--primary, #5C6F5C);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.gc-try-again-btn:hover {
    background: rgba(92, 111, 92, 0.08);
}

.gc-petra-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: rgba(92, 111, 92, 0.08);
    border: 1px solid rgba(92, 111, 92, 0.2);
    border-radius: 24px;
    color: var(--primary, #5C6F5C);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.gc-petra-btn:hover {
    background: rgba(92, 111, 92, 0.12);
    border-color: rgba(92, 111, 92, 0.3);
    transform: translateY(-1px);
}

.gc-petra-btn svg {
    width: 16px;
    height: 16px;
}

/* Navigation */
.gc-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-primary, #E8E3DA);
}

.gc-nav-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-muted, #9E9689);
    font-weight: 500;
    cursor: pointer;
    transition: color 0.2s ease;
}

.gc-nav-back:hover {
    color: var(--primary, #5C6F5C);
}

.gc-nav-progress {
    font-size: 0.875rem;
    color: var(--text-muted, #9E9689);
}

.gc-nav-progress strong {
    color: var(--text-primary, #1A1816);
}

/* Badges Display */
.gc-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.gc-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(245, 158, 11, 0.2) 100%);
    color: #d97706;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.gc-badge svg {
    width: 14px;
    height: 14px;
}

/* Mobile Responsive */
@media (max-width: 640px) {
    .gc-exercise-card {
        padding: 1.5rem;
    }
    
    .gc-prompt {
        padding: 1rem;
    }
    
    .gc-answer-input {
        min-height: 160px;
    }
    
    .gc-actions {
        flex-direction: column;
    }
    
    .gc-clear-btn,
    .gc-submit-btn {
        width: 100%;
        justify-content: center;
    }
    
    .gc-feedback-actions {
        flex-direction: column;
    }
    
    .gc-next-btn,
    .gc-try-again-btn,
    .gc-petra-btn {
        width: 100%;
        justify-content: center;
    }
    
    .gc-type-cards {
        grid-template-columns: 1fr;
    }
    
    .gc-scores {
        flex-direction: column;
    }
    
    .gc-score-item {
        width: 100%;
        justify-content: space-between;
    }
    
    .gc-stats-banner {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Dark Mode Support */
body.dark-mode .gc-exercise-card,
body.dark-mode .gc-feedback-card,
body.dark-mode .gc-type-card,
body.dark-mode .gc-content-block {
    background: var(--bg-white, #222222);
    border-color: var(--border-primary, #2D2D2D);
}

body.dark-mode .gc-prompt {
    background: var(--bg-cream, #1A1A1A);
    border-color: var(--border-primary, #2D2D2D);
}

body.dark-mode .gc-answer-input {
    background: var(--bg-white, #222222);
    border-color: var(--border-primary, #2D2D2D);
    color: var(--text-secondary, #E8E6E3);
}

body.dark-mode .gc-answer-input:focus {
    border-color: var(--primary, #7FA87F);
    box-shadow: 0 0 0 3px rgba(127, 168, 127, 0.15);
}

body.dark-mode .gc-challenge-badge {
    background: rgba(127, 168, 127, 0.15);
}

body.dark-mode .gc-feedback-card.correct {
    background: rgba(34, 197, 94, 0.08);
}

body.dark-mode .gc-feedback-card.incorrect {
    background: rgba(239, 68, 68, 0.08);
}

body.dark-mode .gc-feedback-card.partial {
    background: rgba(245, 158, 11, 0.08);
}

body.dark-mode .gc-ai-feedback {
    background: rgba(99, 102, 241, 0.1);
    border-color: rgba(99, 102, 241, 0.2);
}

body.dark-mode .gc-stats-banner {
    background: rgba(127, 168, 127, 0.08);
}

/* Animation for feedback appearance */
@keyframes gc-fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.gc-feedback-card {
    animation: gc-fadeIn 0.3s ease;
}