/* ========================================
   manage.html — 課程管理頁面
   ======================================== */

body {
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* ── Container ── */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 36px 32px;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
}

.page-title {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

/* ── Tabs — underline style ── */
.main-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.main-tab {
    padding: 10px 16px;
    text-align: center;
    border: none;
    background: none;
    font-family: inherit;
    font-size: 0.83rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-bottom: -1px;
}

.main-tab:hover {
    color: var(--text-primary);
}

.main-tab.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
    font-weight: 600;
}

.main-tab .material-symbols-outlined {
    font-size: 1.05rem;
    opacity: 0.85;
}

.main-tab.active .material-symbols-outlined {
    opacity: 1;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: contentFadeIn 0.25s ease;
}

/* ── Button overrides ── */
.btn .material-symbols-outlined {
    font-size: 0.9rem;
}

/* (view-toggle removed — tree view only) */


/* ── Card Grid ── */
/* ── Project Tree View ── */
.project-tree {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.tree-project {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.tree-project:hover {
    border-color: var(--border-input);
    box-shadow: var(--shadow-card-hover);
}

/* ── Tree Row (project header) ── */
.tree-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 18px;
    font-size: 0.82rem;
    min-height: 52px;
}

.tree-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border: none;
    background: none;
    border-radius: var(--radius-xs);
    cursor: pointer;
    color: var(--text-muted);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.tree-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.tree-toggle .material-symbols-outlined {
    font-size: 1.1rem;
    transition: transform 0.2s ease;
}

.tree-toggle.open .material-symbols-outlined {
    transform: rotate(90deg);
}

/* ── Category Tag ── */
.cat-tag {
    font-size: 0.65rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    white-space: nowrap;
    flex-shrink: 0;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.cat-tag.cat-course {
    background: var(--accent-primary-light);
    color: var(--accent-primary);
    border: 1px solid rgba(99, 102, 241, 0.15);
}

.cat-tag.cat-corporate {
    background: var(--accent-warning-bg);
    color: #a16207;
    border: 1px solid rgba(234, 179, 8, 0.2);
}

/* ── Tree Name ── */
.tree-name {
    font-weight: 650;
    font-size: 0.85rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    flex: 1;
}

/* ── Phase badge (reuse existing styles) ── */
.card-phase {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.65rem;
    font-weight: 600;
    padding: 2px 9px;
    border-radius: var(--radius-full);
    letter-spacing: -0.01em;
    white-space: nowrap;
    flex-shrink: 0;
}

.card-phase.pre-class {
    background: var(--accent-warning-bg);
    color: #a16207;
}

.card-phase.in-class {
    background: var(--accent-success-bg);
    color: #15803d;
}

.card-phase.post-class {
    background: var(--accent-primary-light);
    color: var(--accent-primary);
}

.card-phase-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
}

.card-phase.pre-class .card-phase-dot {
    background: var(--accent-warning);
}

.card-phase.in-class .card-phase-dot {
    background: var(--accent-success);
}

.card-phase.post-class .card-phase-dot {
    background: var(--accent-primary);
}

/* ── Tree Meta (session summary) ── */
.tree-meta {
    font-size: 0.72rem;
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

/* ── Join Code ── */
.card-code {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    white-space: nowrap;
    flex-shrink: 0;
}

.card-code:hover {
    background: var(--accent-primary-light);
    border-color: var(--accent-primary-muted);
    color: var(--accent-primary);
}

.card-code.copied {
    background: var(--accent-success-bg);
    color: #15803d;
    border-color: rgba(34, 197, 94, 0.2);
}

/* ── Tree Date ── */
.tree-date {
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

/* ── Tree Actions ── */
.tree-actions {
    display: flex;
    gap: 2px;
    flex-shrink: 0;
    margin-left: auto;
}

.tree-actions .btn-sm {
    padding: 4px 6px;
    border-radius: var(--radius-xs);
}

/* ── Expandable Children ── */
.tree-children {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
    border-top: 0 solid var(--border-light);
}

.tree-children.open {
    max-height: 600px;
    border-top-width: 1px;
}

/* ── Session sub-rows ── */
.tree-session {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 16px 9px 54px;
    font-size: 0.78rem;
    border-bottom: 1px solid var(--border-light);
    transition: background var(--transition-fast);
}

.tree-session:last-child {
    border-bottom: none;
}

.tree-session:hover {
    background: var(--bg-hover);
}

.tree-session.tree-empty {
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 14px 16px 14px 54px;
}

.session-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
}

.session-dot.pre-class {
    background: var(--accent-warning);
}

.session-dot.in-class {
    background: var(--accent-success);
}

.session-dot.post-class {
    background: #8b5cf6;
}

/* ── Format Tags ── */
.fmt-tag {
    font-size: 0.65rem;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 4px;
    flex-shrink: 0;
}

.fmt-tag.fmt-online {
    background: #e0e7ff;
    color: #4338ca;
}

.fmt-tag.fmt-offline {
    background: #dcfce7;
    color: #166534;
}

.tree-session-date {
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
}

.tree-session-loc {
    color: var(--text-muted);
    font-size: 0.75rem;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tree-session-code {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    padding: 1px 6px;
    border-radius: var(--radius-xs);
    flex-shrink: 0;
}

.stream-link {
    color: #4338ca;
    text-decoration: none;
    font-size: 0.75rem;
}

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

/* ── Table Wrapper ── */
.data-table-wrap {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.status-badge.paid {
    background: var(--accent-success-bg);
    color: #15803d;
}

.status-badge.refunded {
    background: var(--accent-warning-bg);
    color: #b45309;
}

.status-badge.purchased {
    background: #eff6ff;
    color: #1d4ed8;
}

.status-badge.registered {
    background: var(--accent-success-bg);
    color: #15803d;
}

.status-badge.attended {
    background: #f5f3ff;
    color: #6d28d9;
}

/* ── Assignment Cards ── */
.assignment-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 16px;
}

.assignment-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-card);
}

.assignment-card:hover {
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-1px);
}

.assignment-card-body {
    padding: 18px 20px;
}

.assignment-card-title {
    font-size: 0.95rem;
    font-weight: 650;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.02em;
}

.assignment-type-tag {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    font-size: 0.62rem;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: var(--radius-xs);
    background: var(--accent-primary-light);
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.assignment-card-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    gap: 3px;
    margin-top: 8px;
}

.assignment-card-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.assignment-card-meta .material-symbols-outlined {
    font-size: 0.85rem;
}

.assignment-card-footer {
    border-top: 1px solid var(--border-light);
    display: flex;
}

.assignment-card-footer .card-action {
    flex: 1;
}

.assignment-stat {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.assignment-stat-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.72rem;
    color: var(--text-muted);
}

.assignment-stat-item strong {
    color: var(--text-primary);
    font-size: 0.85rem;
}

/* ── Submission table ── */
.sub-detail-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.78rem;
    margin-top: 10px;
}

.sub-detail-table th {
    text-align: left;
    padding: 8px 12px;
    color: var(--text-secondary);
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.sub-detail-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
}

.sub-detail-table tr:last-child td {
    border-bottom: none;
}

/* ── Status toggle ── */
.status-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xs);
    background: transparent;
    font-size: 0.7rem;
    font-family: inherit;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.status-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--border-input);
}

.status-toggle .material-symbols-outlined {
    font-size: 0.85rem;
}

/* ── Student detail ── */
.student-detail {
    display: flex;
    align-items: center;
    gap: 10px;
}

.student-avatar {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-sm);
    background: var(--gradient-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    flex-shrink: 0;
}

.student-name-col {
    line-height: 1.3;
}

.student-name-col small {
    color: var(--text-muted);
    font-size: 0.7rem;
}

/* ── Filter bar ── */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
}

.filter-bar input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-input);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    background: #fff;
    color: var(--text-primary);
}

.filter-bar input::placeholder {
    color: var(--text-muted);
}

.filter-bar input:focus {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-ring);
}

.filter-bar select {
    padding: 8px 12px;
    border: 1px solid var(--border-input);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-family: inherit;
    outline: none;
    background: #fff;
    color: var(--text-primary);
    min-width: 140px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.filter-bar select:focus {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-ring);
}

/* ── Stats bar ── */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.stats-bar .stat-card {
    padding: 20px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
}

.stats-bar .stat-card::before {
    display: none;
}

.stats-bar .stat-card:hover {
    border-color: var(--border-input);
    box-shadow: var(--shadow-card-hover);
}

.stat-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

.stats-bar .stat-card:nth-child(1) .stat-value {
    color: var(--accent-primary);
}

.stats-bar .stat-card:nth-child(2) .stat-value {
    color: var(--text-primary);
}

.stats-bar .stat-card:nth-child(3) .stat-value {
    color: var(--accent-success);
}

.stats-bar .stat-card:nth-child(4) .stat-value {
    color: var(--text-primary);
}



/* ── Modal overrides ── */
.modal {
    width: 480px;
}

.modal.modal-wide {
    width: 620px;
}

.modal-body-scroll {
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer-right {
    display: flex;
    gap: 8px;
}

/* ── Share Link Bar ── */
.share-link-bar {
    background: #f0f7ff;
    border: 1px solid #d0e3ff;
    padding: 10px 32px;
}

.share-link-inner {
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 1140px;
    margin: 0 auto;
    font-size: 0.82rem;
}

.share-link-label {
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .container {
        padding: 20px 16px;
    }

    .tree-row {
        flex-wrap: wrap;
        gap: 6px;
    }

    .tree-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .tree-session {
        padding-left: 32px;
    }

    .stats-bar {
        flex-wrap: wrap;
    }

    .stat-card {
        min-width: 120px;
    }
}