/* Batch 9: timetable viewing, editing and history. */

.r2-timetable-page {
    display: grid;
    gap: var(--r2-space-5);
    min-width: 0;
}

.r2-timetable-page__header {
    margin-bottom: 0;
}

.r2-section-switcher {
    display: flex;
    gap: 0;
    overflow-x: auto;
    border-bottom: 1px solid var(--r2-border);
}

.r2-section-switcher__item {
    display: grid;
    gap: 0.1rem;
    min-width: 9rem;
    padding: 0.75rem 1rem;
    border-bottom: 3px solid transparent;
    color: var(--r2-text-secondary);
    text-decoration: none;
}

.r2-section-switcher__item strong {
    color: var(--r2-text);
    font-size: var(--r2-font-size-sm);
}

.r2-section-switcher__item span {
    font-size: var(--r2-font-size-xs);
}

.r2-section-switcher__item:hover,
.r2-section-switcher__item.is-active {
    background: var(--r2-surface-subtle);
    color: var(--r2-primary);
    text-decoration: none;
}

.r2-section-switcher__item.is-active {
    border-bottom-color: var(--r2-primary);
}

.r2-timetable-view-switcher {
    display: inline-flex;
    width: max-content;
    max-width: 100%;
    gap: 0.25rem;
    padding: 0.25rem;
    border: 1px solid var(--r2-border);
    border-radius: var(--r2-radius-md);
    background: var(--r2-surface-muted);
}

.r2-timetable-view-switcher a {
    padding: 0.45rem 0.85rem;
    border-radius: var(--r2-radius-sm);
    color: var(--r2-text-secondary);
    font-size: var(--r2-font-size-sm);
    font-weight: var(--r2-weight-medium);
    text-decoration: none;
}

.r2-timetable-view-switcher a:hover,
.r2-timetable-view-switcher a.is-active {
    background: var(--r2-surface);
    color: var(--r2-primary);
    text-decoration: none;
}

.r2-timetable-view-switcher a.is-active {
    box-shadow: 0 1px 2px rgba(16, 29, 54, 0.08);
}

.r2-timetable-workspace {
    display: grid;
    grid-template-columns: minmax(11.5rem, 14rem) minmax(0, 1fr);
    gap: var(--r2-space-5);
    align-items: start;
}

.r2-timetable-class-list {
    position: sticky;
    top: 5rem;
    max-height: calc(100vh - 6rem);
    overflow: auto;
    border: 1px solid var(--r2-border);
    background: var(--r2-surface);
}

.r2-timetable-class-list__head {
    display: grid;
    gap: 0.1rem;
    padding: 0.8rem 0.9rem;
    border-bottom: 1px solid var(--r2-divider);
}

.r2-timetable-class-list__head span {
    color: var(--r2-text-muted);
    font-size: var(--r2-font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.r2-timetable-class-list nav {
    display: grid;
}

.r2-timetable-class-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    border-bottom: 1px solid var(--r2-divider);
}

.r2-timetable-class-item:last-child {
    border-bottom: 0;
}

.r2-timetable-class-item > a {
    display: grid;
    gap: 0.1rem;
    min-width: 0;
    padding: 0.7rem 0.85rem;
    color: var(--r2-text);
    text-decoration: none;
}

.r2-timetable-class-item > a span,
.r2-timetable-class-item > a small {
    overflow: hidden;
    color: var(--r2-text-muted);
    font-size: var(--r2-font-size-xs);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.r2-timetable-class-item:hover,
.r2-timetable-class-item.is-active {
    background: var(--r2-primary-soft);
}

.r2-timetable-class-item.is-active {
    box-shadow: inset 3px 0 0 var(--r2-primary);
}

.r2-overflow-menu {
    position: relative;
    margin-right: 0.45rem;
}

.r2-overflow-menu summary {
    display: grid;
    width: 2rem;
    height: 2rem;
    place-items: center;
    border-radius: var(--r2-radius-sm);
    cursor: pointer;
    list-style: none;
}

.r2-overflow-menu summary::-webkit-details-marker {
    display: none;
}

.r2-overflow-menu[open] summary,
.r2-overflow-menu summary:hover {
    background: var(--r2-surface);
}

.r2-overflow-menu > div {
    position: absolute;
    z-index: 20;
    right: 0;
    min-width: 11rem;
    padding: 0.35rem;
    border: 1px solid var(--r2-border);
    border-radius: var(--r2-radius-overlay);
    background: var(--r2-surface);
    box-shadow: var(--r2-shadow-menu);
}

.r2-overflow-menu a,
.r2-overflow-menu button {
    display: block;
    width: 100%;
    padding: 0.55rem 0.65rem;
    border: 0;
    border-radius: var(--r2-radius-sm);
    background: transparent;
    color: var(--r2-text);
    font: inherit;
    font-size: var(--r2-font-size-sm);
    text-align: left;
    text-decoration: none;
}

.r2-overflow-menu a:hover,
.r2-overflow-menu button:hover {
    background: var(--r2-surface-muted);
}

.r2-overflow-menu .is-danger {
    color: var(--r2-danger);
}

.r2-timetable-main,
.r2-timetable-editor {
    min-width: 0;
}

.r2-timetable-editor {
    display: grid;
    gap: var(--r2-space-4);
    padding: var(--r2-space-5);
    border: 1px solid var(--r2-border);
    background: var(--r2-surface);
}

.r2-timetable-editor .timetable-detail-head {
    margin-bottom: 0;
    padding-bottom: var(--r2-space-4);
    border-bottom: 1px solid var(--r2-divider);
}

.r2-timetable-editor .grade-pill-list-top {
    display: none;
}

.r2-timetable-editor-bar {
    position: sticky;
    z-index: 12;
    top: 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--r2-space-3);
    margin-inline: calc(var(--r2-space-5) * -1);
    padding: 0.65rem var(--r2-space-5);
    border-block: 1px solid var(--r2-border);
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(8px);
}

.r2-timetable-save-state {
    display: inline-grid;
    grid-template-columns: auto auto;
    align-items: center;
    column-gap: 0.4rem;
    color: var(--r2-success);
    font-size: var(--r2-font-size-xs);
}

.r2-timetable-save-state small {
    grid-column: 2;
    color: var(--r2-text-muted);
}

.r2-timetable-save-state__dot {
    width: 0.45rem;
    height: 0.45rem;
    border-radius: 50%;
    background: currentColor;
}

.r2-timetable-save-state.is-dirty {
    color: var(--r2-warning);
}

.r2-timetable-save-state.is-saving {
    color: var(--r2-info);
}

.r2-timetable-save-state.is-failed {
    color: var(--r2-danger);
}

.r2-timetable-page .timetable-week-shell {
    overflow: auto;
    border: 1px solid var(--r2-border);
    border-radius: 0;
    background: var(--r2-surface);
}

.r2-timetable-page .timetable-week-grid {
    min-width: 58rem;
    gap: 0;
    background: var(--r2-border);
}

.r2-timetable-page .timetable-week-head,
.r2-timetable-page .timetable-week-time,
.r2-timetable-page .timetable-week-cell {
    border: 0;
    border-right: 1px solid var(--r2-border);
    border-bottom: 1px solid var(--r2-border);
    border-radius: 0;
    background: var(--r2-surface);
}

.r2-timetable-page .timetable-week-head {
    position: sticky;
    z-index: 4;
    top: 0;
    min-height: 3rem;
    background: var(--r2-surface-muted);
}

.r2-timetable-page .timetable-week-time {
    display: grid;
    place-content: center;
    min-width: 4.5rem;
    padding: 0.4rem;
    background: var(--r2-surface-subtle);
    text-align: center;
}

.r2-timetable-page .timetable-week-time strong {
    font-size: var(--r2-font-size-sm);
}

.r2-timetable-page .timetable-week-time span {
    color: var(--r2-text-muted);
    font-size: var(--r2-font-size-xs);
}

.r2-timetable-page .timetable-week-cell {
    min-height: 5.35rem;
    padding: 0.35rem;
}

.r2-timetable-lesson {
    position: relative;
    display: grid;
    gap: 0.18rem;
    height: 100%;
    min-height: 4.55rem;
    padding: 0.45rem 0.55rem;
    border: 1px solid transparent;
    border-left: 3px solid var(--r2-primary-border);
    border-radius: var(--r2-radius-sm);
    background: var(--r2-primary-soft);
    cursor: grab;
}

.r2-timetable-lesson:hover {
    border-color: var(--r2-primary-border);
    border-left-color: var(--r2-primary);
}

.r2-timetable-lesson.is-substitution-updated {
    border-left-color: var(--r2-warning);
    background: var(--r2-warning-soft);
}

.r2-timetable-lesson .lesson-card-name {
    display: -webkit-box;
    overflow: hidden;
    color: var(--r2-text);
    font-size: var(--r2-font-size-sm);
    line-height: 1.25;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

.r2-timetable-lesson__teacher,
.r2-timetable-lesson__room {
    overflow: hidden;
    color: var(--r2-text-muted);
    font-size: 0.7rem;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.r2-timetable-lesson .lesson-card-room-edit {
    position: absolute;
    right: 0.25rem;
    bottom: 0.25rem;
    min-width: auto;
    padding: 0.15rem 0.3rem;
    border: 0;
    background: var(--r2-surface);
    color: var(--r2-primary);
    font-size: 0.65rem;
}

.r2-timetable-compare {
    margin-top: var(--r2-space-5);
    border-top: 1px solid var(--r2-border);
    background: var(--r2-surface);
}

.r2-timetable-compare > summary {
    padding: 0.9rem 0;
    cursor: pointer;
}

.r2-timetable-compare > summary span {
    display: inline-grid;
    gap: 0.1rem;
}

.r2-timetable-compare > summary small {
    color: var(--r2-text-muted);
    font-weight: var(--r2-weight-regular);
}

.r2-timetable-compare__body {
    display: grid;
    gap: var(--r2-space-4);
    padding-bottom: var(--r2-space-4);
}

.r2-compare-class-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.r2-compare-class-list label {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.55rem;
    border: 1px solid var(--r2-border);
    border-radius: var(--r2-radius-sm);
}

.r2-comparison-table td strong,
.r2-comparison-table td span {
    display: block;
    max-width: 14rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.r2-comparison-table td span {
    color: var(--r2-text-muted);
    font-size: var(--r2-font-size-xs);
}

.r2-comparison-table td.is-highlighted {
    background: var(--r2-warning-soft);
}

.r2-timetable-perspective {
    display: grid;
    gap: var(--r2-space-4);
    padding: var(--r2-space-5);
    border: 1px solid var(--r2-border);
    background: var(--r2-surface);
}

.r2-timetable-perspective__head {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: var(--r2-space-4);
    padding-bottom: var(--r2-space-4);
    border-bottom: 1px solid var(--r2-divider);
}

.r2-timetable-perspective__head h2 {
    margin: 0.1rem 0 0.25rem;
}

.r2-timetable-perspective__summary {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.4rem;
}

.r2-timetable-perspective__summary span {
    padding: 0.35rem 0.5rem;
    border: 1px solid var(--r2-border);
    background: var(--r2-surface-subtle);
    color: var(--r2-text-secondary);
    font-size: var(--r2-font-size-xs);
}

.r2-timetable-perspective__summary span.is-warning {
    border-color: var(--r2-warning-border);
    background: var(--r2-warning-soft);
    color: var(--r2-warning);
}

.r2-perspective-list {
    display: grid;
    border: 1px solid var(--r2-border);
}

.r2-perspective-row {
    display: grid;
    grid-template-columns: minmax(10rem, 0.7fr) minmax(12rem, 1.3fr) minmax(8rem, auto);
    gap: var(--r2-space-4);
    align-items: center;
    padding: 0.75rem 0.9rem;
    border-bottom: 1px solid var(--r2-divider);
}

.r2-perspective-row:last-child {
    border-bottom: 0;
}

.r2-perspective-row.is-warning {
    background: var(--r2-warning-soft);
}

.r2-perspective-row__identity,
.r2-perspective-row__meta {
    display: grid;
    gap: 0.2rem;
    min-width: 0;
}

.r2-perspective-row__identity span,
.r2-perspective-row__meta span,
.r2-perspective-row__meta small {
    overflow: hidden;
    color: var(--r2-text-muted);
    font-size: var(--r2-font-size-xs);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.r2-perspective-row__details summary {
    color: var(--r2-primary);
    cursor: pointer;
    font-size: var(--r2-font-size-sm);
}

.r2-perspective-row__details[open] {
    grid-column: 1 / -1;
}

.r2-perspective-lessons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
    gap: 0.4rem;
    margin-top: 0.6rem;
}

.r2-perspective-lesson {
    display: grid;
    gap: 0.1rem;
    padding: 0.55rem;
    border-left: 3px solid var(--r2-primary-border);
    background: var(--r2-surface-subtle);
}

.r2-perspective-lesson.is-changed {
    border-left-color: var(--r2-warning);
    background: var(--r2-warning-soft);
}

.r2-perspective-lesson span,
.r2-perspective-lesson small {
    color: var(--r2-text-muted);
    font-size: var(--r2-font-size-xs);
}

.r2-perspective-lesson strong {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* History and version comparison. */
.r2-version-page {
    display: grid;
    gap: var(--r2-space-5);
}

.r2-version-summary {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border: 1px solid var(--r2-border);
    background: var(--r2-surface);
}

.r2-version-summary > div {
    display: grid;
    gap: 0.2rem;
    padding: 0.8rem 1rem;
    border-right: 1px solid var(--r2-divider);
}

.r2-version-summary > div:last-child {
    border-right: 0;
}

.r2-version-summary span {
    color: var(--r2-text-muted);
    font-size: var(--r2-font-size-xs);
}

.r2-version-list {
    display: grid;
    border: 1px solid var(--r2-border);
    background: var(--r2-surface);
}

.r2-version-row {
    display: grid;
    grid-template-columns: 5rem minmax(10rem, 0.8fr) minmax(12rem, 1fr) minmax(10rem, 1fr) auto;
    gap: var(--r2-space-4);
    align-items: center;
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--r2-divider);
}

.r2-version-row:last-child {
    border-bottom: 0;
}

.r2-version-row__meta,
.r2-version-row__change,
.r2-version-row__diff {
    display: grid;
    gap: 0.15rem;
    min-width: 0;
}

.r2-version-row small,
.r2-version-row span {
    color: var(--r2-text-muted);
    font-size: var(--r2-font-size-xs);
}

.r2-version-diff-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--r2-space-4);
}

.r2-version-preview {
    overflow: auto;
    border: 1px solid var(--r2-border);
}

.r2-version-preview table {
    min-width: 52rem;
}

@media (max-width: 1100px) {
    .r2-timetable-workspace {
        grid-template-columns: 1fr;
    }

    .r2-timetable-class-list {
        position: static;
        max-height: none;
    }

    .r2-timetable-class-list nav {
        grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
    }

    .r2-timetable-class-item {
        border-right: 1px solid var(--r2-divider);
    }

    .r2-perspective-row {
        grid-template-columns: 1fr 1.4fr;
    }

    .r2-perspective-row__details {
        grid-column: 1 / -1;
    }
}

@media (max-width: 760px) {
    .r2-timetable-editor,
    .r2-timetable-perspective {
        padding: var(--r2-space-4);
    }

    .r2-timetable-editor-bar {
        position: static;
        align-items: stretch;
        flex-direction: column;
        margin-inline: calc(var(--r2-space-4) * -1);
        padding-inline: var(--r2-space-4);
    }

    .r2-timetable-perspective__head {
        flex-direction: column;
    }

    .r2-timetable-perspective__summary {
        justify-content: flex-start;
    }

    .r2-perspective-row,
    .r2-version-row {
        grid-template-columns: 1fr;
    }

    .r2-version-summary,
    .r2-version-diff-grid {
        grid-template-columns: 1fr;
    }

    .r2-version-summary > div {
        border-right: 0;
        border-bottom: 1px solid var(--r2-divider);
    }
}

/* Batch 20 manual review: compact drag feedback and non-blocking comparison. */
.r2-timetable-drag-preview {
    position: fixed;
    z-index: 9999;
    top: -1000px;
    left: -1000px;
    display: grid;
    width: 15rem;
    max-width: min(15rem, calc(100vw - 2rem));
    min-height: 3.75rem;
    max-height: 4.75rem;
    gap: 0.15rem;
    padding: 0.65rem 0.75rem;
    overflow: hidden;
    border: 1px solid var(--r2-primary-border);
    border-left: 4px solid var(--r2-primary);
    border-radius: var(--r2-radius-md);
    background: var(--r2-surface);
    color: var(--r2-text);
    box-shadow: var(--r2-shadow-dialog);
    pointer-events: none;
}

.r2-timetable-drag-preview strong,
.r2-timetable-drag-preview span,
.r2-timetable-drag-preview small {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.r2-timetable-drag-preview strong {
    font-size: var(--r2-font-size-sm);
    line-height: var(--r2-line-tight);
}

.r2-timetable-drag-preview span,
.r2-timetable-drag-preview small {
    color: var(--r2-text-muted);
    font-size: var(--r2-font-size-xs);
}

.r2-timetable-compare__actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--r2-space-3);
    margin-top: var(--r2-space-3);
}

.r2-timetable-compare-status {
    display: inline-flex;
    min-height: 2.25rem;
    align-items: center;
    gap: var(--r2-space-2);
    color: var(--r2-text-secondary);
    font-size: var(--r2-font-size-sm);
}

.r2-timetable-compare-status[data-state="error"] {
    color: var(--r2-danger);
}

.r2-timetable-compare-status__spinner {
    width: 1rem;
    height: 1rem;
    flex: 0 0 auto;
    border: 2px solid var(--r2-primary-border);
    border-top-color: var(--r2-primary);
    border-radius: 50%;
    animation: r2-timetable-compare-spin 0.75s linear infinite;
}

@keyframes r2-timetable-compare-spin {
    to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
    .r2-timetable-compare-status__spinner {
        animation-duration: 1.6s;
    }
}