.seat-settings-btn {
    border: none;
    border-radius: 12px;
    background: var(--primary-bg);
    color: var(--primary);
    font-weight: 700;
    font-size: 13px;
    padding: 10px 14px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.seat-settings-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(var(--primary-rgb), 0.18);
}

.seat-layout-modal {
    max-width: 980px;
    height: min(86vh, 920px);
}

.seat-layout-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.seat-sync-card,
.seat-panel-card,
.seat-classroom-card {
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 16px;
}

body.dark .seat-sync-card,
body.dark .seat-panel-card,
body.dark .seat-classroom-card {
    background: rgba(25, 25, 30, 0.45);
}

.seat-sync-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

.seat-sync-title {
    font-size: 15px;
    font-weight: 800;
}

.seat-sync-subtitle {
    margin-top: 4px;
    color: var(--text-sec);
    font-size: 12px;
    line-height: 1.5;
}

.seat-sync-badge {
    flex-shrink: 0;
    border-radius: 999px;
    padding: 8px 12px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: rgba(var(--primary-rgb), 0.12);
    color: var(--primary);
}

.seat-sync-badge.local {
    background: rgba(255, 159, 67, 0.16);
    color: #c26a00;
}

.seat-layout-tabbar {
    display: inline-flex;
    gap: 8px;
    padding: 6px;
    background: rgba(120, 120, 128, 0.12);
    border-radius: 16px;
    width: fit-content;
}

.seat-layout-tab {
    border: none;
    background: transparent;
    color: var(--text-sec);
    font-weight: 700;
    padding: 10px 14px;
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.seat-layout-tab.active {
    background: rgba(var(--primary-rgb), 0.14);
    color: var(--primary);
}

.seat-layout-panel {
    display: none;
    flex-direction: column;
    gap: 16px;
}

.seat-layout-panel.active {
    display: flex;
}

.seat-panel-title {
    font-size: 15px;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.seat-preview-controls,
.seat-editor-config {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    gap: 12px;
    align-items: end;
}

.seat-editor-config {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.seat-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.seat-field span {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-sec);
}

.seat-field input,
.seat-field select,
.seat-name-input {
    width: 100%;
    border: 1px solid rgba(120, 120, 128, 0.22);
    border-radius: 12px;
    padding: 12px 14px;
    background: rgba(255, 255, 255, 0.8);
    color: var(--text-main);
    font: inherit;
}

.seat-datetime-picker {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 8px;
}

.seat-datetime-picker select {
    width: 100%;
    border: 1px solid rgba(120, 120, 128, 0.22);
    border-radius: 12px;
    padding: 12px 10px;
    background: rgba(255, 255, 255, 0.8);
    color: var(--text-main);
    font: inherit;
}

.seat-datetime-caption {
    margin-top: 8px;
    color: var(--text-sec);
    font-size: 12px;
    line-height: 1.5;
}

body.dark .seat-field input,
body.dark .seat-field select,
body.dark .seat-name-input,
body.dark .seat-datetime-picker select {
    background: rgba(12, 12, 15, 0.65);
    border-color: rgba(255, 255, 255, 0.12);
}

.seat-inline-actions,
.seat-editor-toolbar {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.seat-editor-toolbar {
    justify-content: flex-end;
}

.seat-preview-summary {
    margin-top: 14px;
    padding: 14px;
    border-radius: 16px;
    background: rgba(var(--primary-rgb), 0.08);
    font-size: 13px;
    line-height: 1.6;
}

.seat-preview-summary strong {
    color: var(--primary);
}

.seat-scale-row,
.seat-image-config {
    margin-top: 14px;
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.seat-scale-control {
    flex: 1;
    min-width: 220px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.seat-scale-control span {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-sec);
}

.seat-scale-control input {
    width: 100%;
}

.seat-scale-value {
    min-width: 72px;
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(var(--primary-rgb), 0.12);
    color: var(--primary);
    font-weight: 800;
    text-align: center;
}

.seat-rotation-note {
    margin-top: 12px;
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(120, 120, 128, 0.08);
    color: var(--text-sec);
    font-size: 12px;
    line-height: 1.5;
}

.seat-classroom-card {
    padding: 18px;
}

.seat-board {
    margin: 0 auto 18px auto;
    width: min(320px, 100%);
    text-align: center;
    padding: 12px 18px;
    border-radius: 14px;
    font-size: 13px;
    font-weight: 900;
    letter-spacing: 0.14em;
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.2), rgba(var(--primary-rgb), 0.06));
    color: var(--primary);
}

.seat-preview-grid,
.seat-editor-grid {
    --seat-column-width: 200px;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
}

.seat-image-note {
    margin-top: 10px;
    color: var(--text-sec);
    font-size: 12px;
}

.seat-image-config {
    justify-content: space-between;
}

#seat-image-body textarea {
    margin-top: 4px;
}

.seat-column {
    border-radius: 18px;
    padding: 14px;
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(120, 120, 128, 0.15);
    min-height: 180px;
}

body.dark .seat-column {
    background: rgba(10, 10, 14, 0.38);
    border-color: rgba(255, 255, 255, 0.08);
}

.seat-column-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
}

.seat-column-title {
    font-size: 14px;
    font-weight: 800;
}

.seat-column-actions {
    display: flex;
    gap: 6px;
}

.seat-icon-btn,
.seat-add-btn {
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font: inherit;
    transition: transform 0.18s ease, opacity 0.18s ease;
}

.seat-icon-btn {
    width: 34px;
    height: 34px;
    background: rgba(255, 107, 107, 0.12);
    color: #d64b4b;
}

.seat-add-btn {
    width: 100%;
    padding: 10px 12px;
    background: rgba(var(--primary-rgb), 0.1);
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    margin-top: 10px;
}

.seat-icon-btn:hover,
.seat-add-btn:hover,
.seat-layout-tab:hover {
    transform: translateY(-1px);
}

.seat-desk-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.seat-desk {
    border-radius: 16px;
    padding: 12px;
    background: linear-gradient(180deg, rgba(var(--primary-rgb), 0.09), rgba(var(--primary-rgb), 0.03));
    border: 1px solid rgba(var(--primary-rgb), 0.12);
}

.seat-desk-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}

.seat-desk-title {
    font-size: 12px;
    font-weight: 800;
    color: var(--text-sec);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.seat-desk-seats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
}

.seat-seat-chip {
    min-height: 52px;
    border-radius: 14px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: rgba(255, 255, 255, 0.84);
    border: 1px solid rgba(120, 120, 128, 0.16);
}

body.dark .seat-seat-chip {
    background: rgba(18, 18, 23, 0.7);
    border-color: rgba(255, 255, 255, 0.08);
}

.seat-seat-chip small {
    font-size: 10px;
    font-weight: 700;
    color: var(--text-sec);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.seat-seat-chip strong {
    font-size: 13px;
    line-height: 1.35;
}

.seat-seat-chip.empty strong {
    color: var(--text-sec);
    font-weight: 600;
}

.seat-seat-chip.is-match {
    border-color: rgba(var(--primary-rgb), 0.55);
    box-shadow: 0 0 0 2px rgba(var(--primary-rgb), 0.14);
    background: rgba(var(--primary-rgb), 0.16);
}

.seat-empty-state {
    text-align: center;
    color: var(--text-sec);
    padding: 24px 12px;
    font-size: 13px;
}

@media (max-width: 720px) {
    .seat-layout-modal {
        height: 90vh;
    }

    .seat-datetime-picker {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .seat-datetime-picker select:last-of-type {
        grid-column: 1 / -1;
    }

    .seat-preview-controls,
    .seat-editor-config {
        grid-template-columns: minmax(0, 1fr);
    }

    .seat-layout-tabbar {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .seat-layout-tab {
        width: 100%;
    }

    .seat-editor-toolbar {
        justify-content: stretch;
    }

    .seat-editor-toolbar .btn-primary,
    .seat-editor-toolbar .btn-secondary,
    .seat-inline-actions .btn-secondary,
    .seat-inline-actions .btn-primary {
        flex: 1;
    }

    .seat-scale-row,
    .seat-image-config {
        align-items: stretch;
    }
}

@media (min-width: 721px) {
    .seat-preview-grid.seat-grid-desktop,
    .seat-editor-grid.seat-grid-desktop {
        display: flex;
        gap: 14px;
        overflow-x: auto;
        align-items: flex-start;
        padding-bottom: 8px;
        scrollbar-width: thin;
    }

    .seat-preview-grid.seat-grid-desktop::-webkit-scrollbar,
    .seat-editor-grid.seat-grid-desktop::-webkit-scrollbar {
        height: 8px;
    }

    .seat-preview-grid.seat-grid-desktop::-webkit-scrollbar-thumb,
    .seat-editor-grid.seat-grid-desktop::-webkit-scrollbar-thumb {
        background: rgba(var(--primary-rgb), 0.25);
        border-radius: 999px;
    }

    .seat-preview-grid.seat-grid-desktop .seat-column,
    .seat-editor-grid.seat-grid-desktop .seat-column {
        flex: 0 0 var(--seat-column-width);
    }
}