#relationLearningWorkspacePage {
    width: min(100%, 1600px);
    min-height: 100vh;
    padding: var(--space-lg);
    padding-bottom: calc(var(--space-2xl) + var(--space-xl));
    margin-inline: auto;
    animation: none;
    transform: none;
}

.relation-workspace__status {
    margin: 0 clamp(16px, 3vw, 36px) 12px;
    padding: 10px 14px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.82);
    color: var(--text-secondary, #475569);
    text-align: center;
}

.relation-workspace__status[data-state="error"] {
    color: var(--danger, #b91c1c);
}

.relation-workspace__status[data-state="completed"] {
    color: var(--success, #15803d);
}

.relation-workspace__retry {
    display: block;
    margin: -4px auto 12px;
}

.relation-workspace__retry[hidden] {
    display: none;
}

.relation-workspace__header {
    display: flex;
    gap: var(--space-lg);
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    margin-bottom: var(--space-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.relation-workspace__header-main,
.relation-workspace__meta,
.relation-workspace__mode-switch {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}

.relation-workspace__back,
.relation-workspace__mode-switch button,
.relation-workspace__actions button {
    min-height: 42px;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.relation-workspace__back {
    color: var(--text-secondary);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
}

.relation-workspace__titles p,
.relation-network-panel__header p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.06em;
}

.relation-workspace__titles h1 {
    margin: 0;
    font-family: var(--font-display);
    font-size: clamp(1.25rem, 2.4vw, 1.8rem);
}

.relation-workspace__meta {
    flex-wrap: wrap;
    justify-content: flex-end;
    color: var(--text-secondary);
}

#relationWorkspaceRoundLabel {
    padding: var(--space-xs) var(--space-md);
    color: var(--primary-dark);
    background: color-mix(in srgb, var(--primary) 12%, var(--bg-card));
    border-radius: var(--radius-full);
}

.relation-workspace__mode-switch {
    padding: var(--space-xs);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
}

.relation-workspace__mode-switch button {
    min-height: 34px;
    padding-block: var(--space-xs);
    color: var(--text-muted);
    background: transparent;
    border: 0;
}

.relation-workspace__mode-switch button.is-active {
    color: var(--bg-card);
    background: var(--accent-purple);
}

.relation-workspace__main {
    display: grid;
    grid-template-columns: minmax(0, 42fr) minmax(0, 58fr);
    gap: var(--space-lg);
    align-items: start;
}

#relationLearningWorkspacePage.is-ordinary-segment .relation-workspace__network-pane {
    display: none;
}

#relationLearningWorkspacePage.is-ordinary-segment .relation-workspace__main {
    grid-template-columns: minmax(0, 1fr);
}

#relationLearningWorkspacePage.is-ordinary-segment .relation-workspace__card-pane {
    grid-column: 1 / -1;
    width: 100%;
}

.relation-workspace__network-pane,
.relation-workspace__card-pane {
    min-width: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.relation-workspace__network-pane {
    max-height: calc(100vh - 250px);
    overflow: auto;
    overscroll-behavior: contain;
}

.relation-workspace__network-pane > summary {
    display: none;
    padding: var(--space-md);
    color: var(--text-primary);
    font-weight: 800;
    cursor: pointer;
}

.relation-workspace__network-pane.is-collapsed {
    max-height: 72px;
    overflow: hidden;
}

.relation-workspace__card-pane {
    min-height: 480px;
    overflow: hidden;
}

.relation-network-panel {
    display: grid;
    gap: var(--space-md);
    padding: var(--space-lg);
}

.relation-network-panel__header {
    position: sticky;
    z-index: 4;
    top: 0;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-md);
    padding-bottom: var(--space-sm);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
}

.relation-network-panel__header h2 {
    margin: 0;
    font-family: var(--font-display);
    font-size: 1.35rem;
    overflow-wrap: anywhere;
}

.relation-network-panel__round {
    flex: none;
    padding: var(--space-xs) var(--space-sm);
    color: var(--accent-purple);
    background: color-mix(in srgb, var(--accent-purple) 10%, var(--bg-card));
    border-radius: var(--radius-full);
    font-size: 0.84rem;
    font-weight: 800;
}

.relation-network-panel__explanation {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.65;
}

.relation-network-panel__root {
    position: sticky;
    z-index: 3;
    top: 70px;
    display: grid;
    width: 136px;
    min-height: 136px;
    padding: var(--space-md);
    place-content: center;
    justify-self: center;
    color: var(--bg-card);
    text-align: center;
    background: linear-gradient(135deg, var(--accent-purple), var(--primary));
    border: 6px solid color-mix(in srgb, var(--accent-purple) 16%, var(--bg-card));
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
}

.relation-network-panel__root span {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 900;
    overflow-wrap: anywhere;
}

.relation-network-panel__root small {
    opacity: 0.86;
}

.relation-network-panel__batch-heading {
    position: sticky;
    z-index: 2;
    top: 214px;
    display: flex;
    gap: var(--space-sm);
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    color: var(--text-secondary);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.relation-network-panel__batch-heading strong {
    color: var(--success);
}

.relation-network-panel__batch-heading span {
    color: var(--text-muted);
    font-size: 0.84rem;
}

.relation-network-panel__words {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(124px, 1fr));
    gap: var(--space-sm);
}

.relation-network-panel__word {
    position: relative;
    display: grid;
    min-height: 90px;
    padding: var(--space-sm) var(--space-md);
    align-content: center;
    text-align: left;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.relation-network-panel__word-text {
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 900;
    overflow-wrap: anywhere;
}

.relation-network-panel__role,
.relation-network-panel__state {
    color: var(--text-muted);
    font-size: 0.74rem;
}

.relation-network-panel__word.is-focus {
    background: color-mix(in srgb, var(--success) 8%, var(--bg-card));
    border-color: color-mix(in srgb, var(--success) 55%, var(--border-color));
}

.relation-network-panel__word.is-focus .relation-network-panel__state {
    color: var(--success);
    font-weight: 800;
}

.relation-network-panel__word.is-later,
.relation-network-panel__word.is-not-due {
    color: var(--text-muted);
    background: color-mix(in srgb, var(--border-color) 38%, var(--bg-card));
    border-color: var(--border-color);
}

.relation-network-panel__word.is-correct {
    background: color-mix(in srgb, var(--success) 14%, var(--bg-card));
    border-color: var(--success);
}

.relation-network-panel__word.is-correct .relation-network-panel__state {
    color: var(--success);
    font-weight: 900;
}

.relation-network-panel__word.is-wrong,
.relation-network-panel__word.is-due {
    background: color-mix(in srgb, var(--danger) 9%, var(--bg-card));
    border-color: var(--danger);
}

.relation-network-panel__word.is-wrong .relation-network-panel__state,
.relation-network-panel__word.is-due .relation-network-panel__state {
    color: var(--danger);
    font-weight: 900;
}

.relation-network-panel__word.is-pending {
    background: color-mix(in srgb, var(--accent-yellow) 18%, var(--bg-card));
}

.relation-network-panel__word.is-current {
    border-color: var(--warning, #f59e0b);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--warning, #f59e0b) 32%, transparent), var(--shadow-sm);
}

.relation-network-panel__word:hover,
.relation-workspace__back:hover,
.relation-workspace__mode-switch button:hover,
.relation-workspace__actions button:hover {
    transform: translateY(-1px);
}

.relation-network-panel__word:focus-visible,
.relation-workspace button:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--accent-blue) 48%, transparent);
    outline-offset: 2px;
}

.relation-network-panel__legend,
.relation-workspace__legend {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs) var(--space-md);
    padding-top: var(--space-sm);
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    font-size: 0.78rem;
}

.relation-network-panel__legend span::before {
    display: inline-block;
    width: 0.65em;
    height: 0.65em;
    margin-right: var(--space-xs);
    content: '';
    background: var(--border-color);
    border-radius: var(--radius-full);
}

.relation-network-panel__legend .is-focus::before,
.relation-network-panel__legend .is-correct::before {
    background: var(--success);
}

.relation-network-panel__legend .is-wrong::before,
.relation-network-panel__legend .is-due::before {
    background: var(--danger);
}

.relation-network-panel__legend .is-current::before {
    background: var(--warning, #f59e0b);
}

.relation-workspace__options.word-card-unified-settings {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 10px;
    width: 100%;
    min-width: 0;
    padding: 12px;
    margin-top: var(--space-lg);
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 18px;
    box-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
}

.relation-workspace__options .word-card-unified-settings__row {
    display: contents;
}

.relation-workspace__options .word-card-setting {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: 100%;
    min-width: 0;
    min-height: 46px;
    padding: 8px 10px;
    color: var(--text-secondary);
    background: transparent;
    border: 0;
    border-radius: 0;
    font-size: 0.88rem;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
}

.relation-workspace__options .word-card-setting--number input {
    width: 48px;
    min-width: 0;
    padding: 4px;
    text-align: center;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.relation-workspace__options .word-card-setting--toggle input {
    flex: 0 0 auto;
    width: auto;
    margin: 0;
    accent-color: var(--success);
}

.relation-workspace__actions {
    position: sticky;
    z-index: 10;
    bottom: max(var(--space-sm), env(safe-area-inset-bottom));
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    align-items: center;
    justify-content: center;
    width: fit-content;
    max-width: 100%;
    padding: var(--space-sm);
    margin: var(--space-md) auto 0;
    background: color-mix(in srgb, var(--bg-card) 94%, transparent);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
}

.relation-workspace__actions button {
    color: var(--text-primary);
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    font-weight: 800;
}

.relation-workspace__action--relation {
    color: var(--bg-card);
    background: var(--accent-purple);
    border-color: var(--accent-purple);
}

.relation-workspace__action--word {
    color: var(--primary-dark);
    background: var(--bg-card);
    border-color: var(--primary);
}

#relationKnown {
    color: var(--bg-card);
    background: var(--success);
    border-color: var(--success);
}

#relationUnknown {
    color: var(--bg-card);
    background: var(--primary);
    border-color: var(--primary);
}

@media (min-width: 761px) {
    #relationLearningWorkspacePage {
        --relation-workspace-stage-height: clamp(25rem, calc(100dvh - 26rem), 38.75rem);
    }

    .relation-workspace__network-pane {
        height: var(--relation-workspace-stage-height);
        max-height: var(--relation-workspace-stage-height);
    }

    .relation-workspace__card-pane {
        height: var(--relation-workspace-stage-height);
        min-height: var(--relation-workspace-stage-height);
    }

    .relation-workspace__card-pane .unified-word-card__scene,
    .relation-workspace__card-pane .unified-word-card__face,
    .relation-workspace__card-pane .unified-word-card__front-content {
        min-height: var(--relation-workspace-stage-height);
    }

    .relation-workspace__card-pane .unified-word-card__back-scroll {
        min-height: var(--relation-workspace-stage-height);
        max-height: var(--relation-workspace-stage-height);
    }
}

@media (max-width: 1024px) {
    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"]) {
        --teacher-sidebar-width: 0px;
        --teacher-shell-gap: 8px;
    }

    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"])
        .teacher-sidebar.app-sidebar {
        position: fixed;
        top: 8px;
        left: 8px;
        width: 48px;
        min-height: 48px;
        max-height: 48px;
        margin: 0;
        border-radius: 14px;
    }

    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"])
        .teacher-sidebar-toggle {
        position: static;
        display: grid;
        flex: 0 0 36px;
        margin: 5px;
    }

    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"])
        .teacher-sidebar-logo,
    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"])
        .teacher-sidebar-menu,
    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"])
        .teacher-sidebar-art {
        display: none;
    }

    #relationLearningWorkspacePage {
        --relation-workspace-stage-height: clamp(25rem, calc(100dvh - 27.5rem), 38.75rem);
        padding-top: 60px;
    }

    .relation-workspace__header {
        align-items: stretch;
        flex-direction: column;
    }

    .relation-workspace__meta {
        justify-content: flex-start;
    }

    .relation-workspace__main {
        grid-template-columns: minmax(260px, 38fr) minmax(0, 62fr);
    }

    .relation-workspace__network-pane.is-collapsed + .relation-workspace__card-pane {
        grid-column: 1 / -1;
    }
}

@media (max-width: 760px) {
    #relationLearningWorkspacePage[style*="display: block"] {
        --relation-mobile-card-height: clamp(21.25rem, calc(100dvh - 29.5rem), 28rem);
        display: flex !important;
        flex-direction: column;
        padding: var(--space-sm);
        padding-bottom: calc(7.5rem + env(safe-area-inset-bottom));
        overflow-x: clip;
    }

    .relation-workspace__header {
        order: 0;
        gap: 6px;
        padding: 8px 10px;
        margin-bottom: 8px;
    }

    .relation-workspace__header-main {
        width: 100%;
        min-width: 0;
        gap: 8px;
    }

    .relation-workspace__back {
        flex: 0 0 40px;
        width: 40px;
        min-height: 40px;
        padding: 0;
    }

    .relation-workspace__back span {
        display: none;
    }

    .relation-workspace__titles {
        min-width: 0;
    }

    .relation-workspace__titles p {
        overflow: hidden;
        font-size: 0.72rem;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .relation-workspace__titles h1 {
        font-size: 1.05rem;
        line-height: 1.2;
    }

    .relation-workspace__meta {
        display: grid;
        grid-template-columns: auto auto minmax(0, 1fr);
        gap: 6px;
        width: 100%;
        font-size: 0.75rem;
    }

    #relationWorkspaceRoundLabel {
        padding: 5px 8px;
        white-space: nowrap;
    }

    .relation-workspace__mode-switch {
        min-width: 0;
        padding: 2px;
    }

    .relation-workspace__mode-switch button {
        min-height: 30px;
        min-width: 0;
        padding: 3px 6px;
        font-size: 0.75rem;
        white-space: nowrap;
    }

    .relation-workspace__main {
        order: 3;
        grid-template-columns: 1fr;
        gap: 8px;
        width: 100%;
        min-width: 0;
    }

    .relation-workspace__network-pane {
        max-height: none;
        overflow-x: hidden;
    }

    .relation-workspace__network-pane > summary {
        display: flex;
        align-items: center;
        justify-content: space-between;
        min-height: 44px;
        padding: 10px 12px;
    }

    .relation-workspace__network-pane:not([open]) + .relation-workspace__card-pane {
        grid-column: 1 / -1;
        width: 100%;
    }

    .relation-workspace__card-pane {
        width: 100%;
        max-width: 100%;
        min-width: 0;
        min-height: var(--relation-mobile-card-height);
        margin-bottom: 0;
    }

    .relation-workspace__card-pane .unified-word-card__scene,
    .relation-workspace__card-pane .unified-word-card__face,
    .relation-workspace__card-pane .unified-word-card__front-content {
        min-height: var(--relation-mobile-card-height);
    }

    .relation-workspace__card-pane .unified-word-card__front-content {
        padding: 18px 14px;
        gap: 12px;
    }

    .relation-workspace__card-pane .unified-word-card__front-content
        .unified-word-card__word-line > div:first-child {
        flex: 0 1 auto;
    }

    .relation-workspace__card-pane .unified-word-card__front-example {
        gap: 6px;
    }

    .relation-workspace__card-pane .unified-word-card__front-example p {
        line-height: 1.45;
    }

    .relation-workspace__card-pane .unified-word-card__back-scroll {
        min-height: var(--relation-mobile-card-height);
        max-height: var(--relation-mobile-card-height);
    }

    .relation-network-panel__header,
    .relation-network-panel__root,
    .relation-network-panel__batch-heading {
        position: static;
    }

    .relation-workspace__options.word-card-unified-settings {
        order: 2;
        grid-template-columns: 1fr;
        gap: 8px;
        padding: 8px;
        margin: 0 0 8px;
    }

    .relation-workspace__options .word-card-unified-settings__row {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 6px;
    }

    .relation-workspace__options .word-card-setting {
        box-sizing: border-box;
        flex-direction: column;
        gap: 3px;
        min-height: 44px;
        padding: 4px;
        background: transparent;
        border: 0;
        border-radius: 0;
        font-size: 0.78rem;
        line-height: 1.15;
    }

    .relation-workspace__actions {
        order: 4;
        position: fixed;
        z-index: 50;
        left: max(var(--space-sm), env(safe-area-inset-left));
        right: max(var(--space-sm), env(safe-area-inset-right));
        bottom: 0;
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        grid-template-areas:
            "previous known unknown next"
            "previous-group previous-group next-group next-group";
        width: auto;
        padding: var(--space-sm) var(--space-sm)
            calc(var(--space-sm) + env(safe-area-inset-bottom));
        margin: 0;
        border-radius: var(--radius-lg);
    }

    .relation-workspace__actions button {
        width: 100%;
        min-width: 0;
        min-height: 40px;
        padding: 6px 4px;
        font-size: 0.78rem;
    }

    #relationKnown { grid-area: known; }
    #relationUnknown { grid-area: unknown; }
    #relationPreviousWord { grid-area: previous; }
    #relationNextWord { grid-area: next; }
    #relationPreviousGroup { grid-area: previous-group; }
    #relationNextGroup { grid-area: next-group; }

    .relation-workspace__actions .relation-workspace__action--relation {
        min-height: 34px;
        padding-block: 4px;
        font-size: 0.78rem;
    }
}

@media (max-width: 480px) {
    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"]) {
        --teacher-sidebar-width: 0px;
        --teacher-shell-gap: 8px;
    }

    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"])
        .teacher-sidebar.app-sidebar {
        top: 8px;
        left: 8px;
        width: 48px;
        min-height: 48px;
        max-height: 48px;
        border-radius: 14px;
    }

    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"])
        .teacher-sidebar-toggle {
        position: static;
        display: grid;
        flex: 0 0 36px;
        margin: 5px;
    }

    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"])
        .teacher-sidebar-logo,
    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"])
        .teacher-sidebar-menu,
    body.teacher-shell-active.teacher-shell-collapsed:has(#relationLearningWorkspacePage[style*="display: block"])
        .teacher-sidebar-art {
        display: none;
    }

    #relationLearningWorkspacePage {
        padding-top: 60px;
        padding-bottom: calc(7.5rem + env(safe-area-inset-bottom));
        scroll-padding-bottom: var(--space-lg);
        overflow-x: clip;
    }

    .relation-workspace__header-main {
        align-items: flex-start;
    }

    .relation-workspace__meta {
        align-items: stretch;
        flex-direction: column;
    }

    .relation-workspace__mode-switch button {
        flex: 1;
    }

    .relation-network-panel {
        padding: var(--space-md);
    }

    .relation-network-panel__words {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .relation-workspace__network-pane > summary {
        display: flex;
    }

    .relation-workspace__card-pane {
        width: 100%;
        max-width: 100%;
        margin-bottom: 0;
    }

    .relation-workspace__options .word-card-unified-settings__row {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .relation-workspace__actions {
        position: fixed;
        left: max(var(--space-sm), env(safe-area-inset-left));
        right: max(var(--space-sm), env(safe-area-inset-right));
        bottom: 0;
        padding-bottom: calc(var(--space-sm) + env(safe-area-inset-bottom));
        margin: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    .relation-workspace button,
    .relation-network-panel__word {
        transition: none;
    }
}