/* ===== Exercise Page Shared ===== */
.ex-page {
    padding: 32px 0 80px;
}

.back-link {
    display: inline-block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 32px;
}

.back-link:hover {
    color: var(--accent);
}

.ex-header {
    margin-bottom: 40px;
}

.ex-badge {
    display: inline-block;
    background: rgba(0, 172, 237, 0.15);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.ex-header h1 {
    font-size: 2rem;
    margin-bottom: 8px;
}

.ex-intro {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 640px;
}

/* ===== Shared Form Elements ===== */
.field-group {
    margin-bottom: 16px;
}

.field-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.field-hint {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-bottom: 6px;
}

.field-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    line-height: 1.5;
    resize: vertical;
    outline: none;
    transition: border-color 0.2s;
}

.field-group textarea:focus {
    border-color: var(--accent);
}

.field-group textarea::placeholder {
    color: var(--text-muted);
}

/* ===== Exercise 1: Prompt Scorer ===== */
.scorer-layout {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.scorer-input-area {
    max-width: 700px;
}

.scorer-input-area label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.scorer-input-area textarea {
    width: 100%;
    padding: 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
    transition: border-color 0.2s;
    margin-bottom: 16px;
}

.scorer-input-area textarea:focus {
    border-color: var(--accent);
}

.scorer-input-area textarea::placeholder {
    color: var(--text-muted);
}

/* Scorecard */
.scorecard {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    max-width: 700px;
}

.score-total {
    text-align: center;
    margin-bottom: 28px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.score-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
}

.score-label {
    font-size: 1.5rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.score-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.score-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px;
    border-radius: var(--radius);
    background: var(--bg-card);
    border: 1px solid var(--border);
}

.score-item.pass {
    border-left: 3px solid var(--success);
}

.score-item.fail {
    border-left: 3px solid #EF4444;
}

.score-icon {
    font-size: 1.1rem;
    font-weight: 700;
    min-width: 20px;
    text-align: center;
    line-height: 1.4;
}

.score-item.pass .score-icon {
    color: var(--success);
}

.score-item.fail .score-icon {
    color: #EF4444;
}

.score-detail strong {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 2px;
}

.score-detail p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin: 0;
}

.score-footer {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.score-footer p {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.95rem;
    text-align: center;
}

/* ===== Exercise 2: Reconstruction ===== */
.recon-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 24px;
}

.recon-column-title {
    font-size: 1.15rem;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.recon-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}

/* Compare results */
.compare-results {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    max-width: 600px;
}

.compare-results h3 {
    font-size: 1.1rem;
    margin-bottom: 16px;
}

.compare-summary {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.compare-summary strong {
    color: var(--accent);
}

.compare-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.compare-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-radius: var(--radius);
    background: var(--bg-card);
    border: 1px solid var(--border);
}

.compare-label {
    font-weight: 600;
    font-size: 0.9rem;
}

.compare-status {
    font-size: 0.8rem;
    padding: 2px 10px;
    border-radius: 4px;
}

.compare-item.improved .compare-status {
    color: var(--success);
    background: rgba(0, 186, 124, 0.15);
}

.compare-item.same .compare-status {
    color: var(--text-muted);
    background: rgba(107, 114, 128, 0.15);
}

.compare-item.still-empty .compare-status {
    color: #EF4444;
    background: rgba(239, 68, 68, 0.15);
}

/* ===== Exercise 3: Knowledge File Builder ===== */
.builder-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: start;
}

.builder-form .btn {
    margin-top: 8px;
}

.builder-preview {
    position: sticky;
    top: 80px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-card);
}

.preview-header h3 {
    font-size: 0.9rem;
}

.preview-badge {
    font-size: 0.7rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-muted);
    background: rgba(107, 114, 128, 0.2);
    padding: 2px 8px;
    border-radius: 4px;
}

.preview-content {
    padding: 20px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    line-height: 1.7;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 600px;
    overflow-y: auto;
    margin: 0;
}

/* ===== Exercise 4: Walkthrough ===== */
.walkthrough-steps {
    display: flex;
    flex-direction: column;
    gap: 32px;
    margin-bottom: 64px;
}

.step {
    display: flex;
    gap: 24px;
}

.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    font-weight: 700;
}

.step-content {
    flex: 1;
}

.step-content h2 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 16px;
    max-width: 600px;
}

.screenshot-placeholder {
    background: var(--bg-card);
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.screenshot-placeholder span {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Tips */
.tips-section {
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.tips-section h2 {
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.tip-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.tip-card .tip-number {
    width: 32px;
    height: 32px;
    background: rgba(0, 172, 237, 0.15);
    color: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.tip-card h3 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.tip-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.tip-card code {
    background: var(--bg-input);
    padding: 1px 6px;
    border-radius: 3px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85em;
    color: var(--accent);
}

/* ===== Exercise Card Link Style (for exercises.html) ===== */
a.exercise-card {
    text-decoration: none;
    color: inherit;
    transition: border-color 0.2s, background 0.2s;
}

a.exercise-card:hover {
    border-color: var(--accent);
    background: rgba(0, 172, 237, 0.04);
    color: inherit;
}

a.exercise-card .exercise-link-arrow {
    color: var(--accent);
    margin-left: auto;
    font-size: 1.1rem;
    flex-shrink: 0;
    opacity: 0;
    transition: opacity 0.2s;
}

a.exercise-card:hover .exercise-link-arrow {
    opacity: 1;
}

/* ===== Exercise Card Download Button ===== */
.exercise-info .btn {
    margin-top: 10px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .recon-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .builder-layout {
        grid-template-columns: 1fr;
    }

    .builder-preview {
        position: static;
    }

    .tips-grid {
        grid-template-columns: 1fr;
    }

    .step {
        flex-direction: column;
        gap: 12px;
    }

    .recon-actions {
        flex-direction: column;
    }

    .recon-actions .btn {
        width: 100%;
        justify-content: center;
    }
}