/* ===== Discussion / Q&A Pages ===== */

.discussion-page {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

.discussion-page h1 {
    font-size: 1.5rem;
    margin: 0 0 0.25rem;
}

.discussion-breadcrumb {
    color: var(--text-secondary, #6b7280);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.discussion-breadcrumb a {
    color: var(--accent-color, #2563eb);
    text-decoration: none;
}

.discussion-breadcrumb a:hover {
    text-decoration: underline;
}

/* Thread List */
.thread-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.thread-card {
    display: flex;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary, #fff);
    border: 1px solid var(--border-color, #e1e4e8);
    border-radius: 8px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s;
}

.thread-card:hover {
    border-color: var(--accent-color, #2563eb);
}

.thread-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    flex-shrink: 0;
}

.thread-avatar-placeholder {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--border-color, #e1e4e8);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary, #6b7280);
    flex-shrink: 0;
}

.thread-info {
    flex: 1;
    min-width: 0;
}

.thread-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin: 0 0 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.thread-meta {
    color: var(--text-secondary, #6b7280);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.thread-reply-count {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Status Badges */
.status-badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.status-badge.open {
    background: rgba(59, 130, 246, 0.1);
    color: #2563eb;
}

.status-badge.resolved {
    background: rgba(34, 197, 94, 0.1);
    color: #16a34a;
}

.status-badge.closed {
    background: rgba(107, 114, 128, 0.1);
    color: #6b7280;
}

/* Instructor Badge */
.instructor-badge {
    display: inline-block;
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    background: rgba(139, 92, 246, 0.1);
    color: #7c3aed;
}

/* Thread Detail */
.thread-detail {
    background: var(--bg-secondary, #fff);
    border: 1px solid var(--border-color, #e1e4e8);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.thread-detail-header {
    padding: 1.5rem 2rem 1rem;
    border-bottom: 1px solid var(--border-color, #e1e4e8);
}

.thread-detail-header h1 {
    font-size: 1.25rem;
    margin: 0 0 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.thread-detail-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary, #6b7280);
    font-size: 0.85rem;
}

.thread-detail-body {
    padding: 1.25rem 2rem;
}

.thread-actions {
    padding: 0.75rem 2rem 1.25rem;
    display: flex;
    gap: 0.5rem;
}

/* Reply Cards */
.reply-list {
    display: flex;
    flex-direction: column;
}

.reply-card {
    padding: 1rem 2rem;
    border-top: 1px solid var(--border-color, #e1e4e8);
}

.reply-card.instructor {
    border-left: 3px solid #7c3aed;
    background: rgba(139, 92, 246, 0.03);
}

.reply-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
}

.reply-author {
    font-weight: 600;
}

.reply-time {
    color: var(--text-secondary, #6b7280);
}

.reply-body {
    font-size: 0.925rem;
    line-height: 1.6;
}

.reply-body p:last-child {
    margin-bottom: 0;
}

/* New Thread / Reply Forms */
.discussion-form {
    background: var(--bg-secondary, #fff);
    border: 1px solid var(--border-color, #e1e4e8);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.discussion-form h2,
.discussion-form h3 {
    font-size: 1rem;
    margin: 0 0 1rem;
}

.discussion-form .form-group {
    margin-bottom: 1rem;
}

.discussion-form label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
}

.discussion-form input[type="text"],
.discussion-form textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color, #e1e4e8);
    border-radius: 6px;
    font-size: 0.9rem;
    font-family: inherit;
    background: var(--bg-primary, #fff);
    color: inherit;
    box-sizing: border-box;
}

.discussion-form input[type="text"]:focus,
.discussion-form textarea:focus {
    outline: none;
    border-color: var(--accent-color, #2563eb);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.discussion-form textarea {
    min-height: 100px;
    resize: vertical;
}

.discussion-form .form-hint {
    font-size: 0.75rem;
    color: var(--text-secondary, #6b7280);
    margin-top: 0.25rem;
}

/* Buttons */
.btn-discussion {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.15s;
}

.btn-discussion:hover {
    opacity: 0.85;
}

.btn-discussion.primary {
    background: var(--accent-color, #2563eb);
    color: #fff;
}

.btn-discussion.secondary {
    background: var(--border-color, #e1e4e8);
    color: inherit;
}

.btn-discussion.success {
    background: #16a34a;
    color: #fff;
}

.btn-discussion.danger {
    background: #dc2626;
    color: #fff;
}

.btn-discussion.small {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
}

/* Discussion Link on Lesson Page */
.discussion-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--accent-color, #2563eb);
    font-size: 0.875rem;
    text-decoration: none;
    padding: 0.375rem 0;
}

.discussion-link:hover {
    text-decoration: underline;
}

/* Pagination */
.discussion-pager {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 1rem 0;
}

/* Empty State */
.discussion-empty {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-secondary, #6b7280);
}

/* Validation Errors */
.discussion-form .validation-message {
    color: #dc2626;
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

/* Admin Moderation Table */
.discussion-admin-table {
    width: 100%;
    border-collapse: collapse;
}

.discussion-admin-table th,
.discussion-admin-table td {
    padding: 0.625rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color, #e1e4e8);
    font-size: 0.875rem;
}

.discussion-admin-table th {
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-secondary, #6b7280);
}

.discussion-admin-actions {
    display: flex;
    gap: 0.375rem;
}