:root {
    --bg: #f1f1f1;
    --panel: #ffffff;
    --line: #cfd4db;
    --text: #1c232c;
    --muted: #68727f;
    --accent: #2d6b8a;
    --accent-soft: #e9f1f6;
    --accent-strong: #1d4d66;
    --success: #e0f0e5;
    --success-text: #28553a;
    --error: #f7dfdd;
    --error-text: #7f2d28;
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, sans-serif;
    background: #eceef2;
    color: var(--text);
    padding-top: env(safe-area-inset-top, 0);
    padding-bottom: env(safe-area-inset-bottom, 0);
}

body.seatplan-fullscreen {
    overflow: hidden;
}

a {
    color: var(--accent-strong);
    text-decoration: none;
}

input,
select,
textarea,
button {
    font: inherit;
}

input,
select,
textarea {
    width: 100%;
    padding: 7px 9px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fff;
    color: var(--text);
}

button,
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 12px;
    border: 1px solid #2b5971;
    border-radius: 6px;
    background: var(--accent);
    color: #fff;
    cursor: pointer;
}

.button-secondary {
    border-color: var(--line);
    background: #f3f4f6;
    color: var(--text);
}

.button-danger {
    border-color: #8d2a22;
    background: #b3392f;
    color: #fff;
}

.topbar-actions {
    margin-left: auto;
}

.install-button[hidden] {
    display: none;
}

.app-shell {
    min-height: 100vh;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 40;
    border-bottom: 1px solid var(--line);
    background: linear-gradient(180deg, #fafafa 0%, #eceef2 100%);
    overflow: hidden;
}

.topbar.is-collapsed {
    height: 0;
    min-height: 0;
    border: 0;
    opacity: 0;
    pointer-events: none;
}

.topbar-row,
.nav-sub {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 8px 16px;
}

.topbar-row {
    min-height: 44px;
}

.brand {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    white-space: nowrap;
}

.nav-main,
.nav-sub {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.nav-main {
    min-width: 0;
}

.nav-main a,
.nav-sub a {
    padding: 4px 8px;
    border-radius: 5px;
    color: var(--text);
}

.nav-main a:hover,
.nav-sub a:hover {
    background: #dde4ea;
}

.nav-sub {
    border-top: 1px solid #e0e3e8;
    background: #f6f7f9;
    font-size: 0.92rem;
}

.content {
    padding: 14px 14px 26px;
}

.install-hint {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
    padding: 10px 12px;
    border: 1px solid #c7d8e2;
    border-radius: 10px;
    background: #eef6fa;
    color: var(--accent-strong);
    font-size: 0.92rem;
}

.install-hint-close {
    min-width: 30px;
    min-height: 30px;
    padding: 0;
    border-color: #c7d8e2;
    background: #fff;
    color: var(--text);
    font-size: 1rem;
    line-height: 1;
}

.seatplan-fullscreen .topbar,
.seatplan-fullscreen .flash-stack {
    display: none;
}

.seatplan-fullscreen .content {
    padding: 0;
    height: 100vh;
}

@media (display-mode: standalone) {
    .content {
        padding-bottom: max(18px, env(safe-area-inset-bottom, 0));
    }
}

.panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
}

.page-header {
    margin-bottom: 14px;
}

.page-header h1,
.panel h2,
.panel h3 {
    margin: 0;
}

.page-header p,
.empty-state,
.panel-note {
    color: var(--muted);
}

.stats-grid,
.grid {
    display: grid;
    gap: 12px;
    margin-bottom: 14px;
}

.stats-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
}

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

.stat-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 14px;
}

.stat-card span {
    display: block;
    color: var(--muted);
    margin-bottom: 8px;
}

.stat-card strong {
    font-size: 1.6rem;
}

.form-grid {
    display: grid;
    gap: 12px;
}

.form-grid label,
.meta-list div {
    display: grid;
    gap: 5px;
}

.button-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.backup-encrypted-form {
    max-width: 560px;
}

.backup-restore-form {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.backup-action-stack {
    display: grid;
    gap: 8px;
}

.backup-row-actions {
    gap: 8px;
}

.security-panel {
    padding: 12px;
}

.security-block {
    display: grid;
    gap: 8px;
    margin-bottom: 12px;
}

.security-uri code {
    display: block;
    overflow-wrap: anywhere;
    white-space: normal;
}

.qr-card {
    display: inline-flex;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #fff;
}

.qr-image {
    width: 180px;
    height: 180px;
    display: block;
}

.backup-restore-form input[type="password"] {
    width: 170px;
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 7px 8px;
    text-align: left;
    border-bottom: 1px solid #e7eaef;
    vertical-align: middle;
}

th {
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 600;
}

.flash-stack {
    display: grid;
    gap: 8px;
    margin-bottom: 12px;
}

.flash {
    padding: 10px 12px;
    border-radius: 8px;
}

.flash-success {
    background: var(--success);
    color: var(--success-text);
}

.flash-error {
    background: var(--error);
    color: var(--error-text);
}

.meta-list {
    display: grid;
    gap: 10px;
    margin: 0;
}

.meta-list dt {
    color: var(--muted);
}

.meta-list dd {
    margin: 0;
    font-weight: 600;
}

.assessment-toolbar {
    margin-bottom: 10px;
}

.toolbar-grid {
    display: grid;
    gap: 8px;
}

.toolbar-grid-compact {
    grid-template-columns: 300px 300px 240px auto;
    align-items: end;
}

.toolbar-grid label {
    display: grid;
    gap: 4px;
}

.toolbar-actions {
    display: flex;
    justify-content: flex-end;
}

.students-sort-form {
    min-width: 180px;
}

.students-sort-form label {
    display: grid;
    gap: 4px;
}

.inline-class-tag {
    color: var(--muted);
    font-size: 0.9em;
}

.inline-delete-form {
    margin: 0;
}

.button-small {
    padding: 5px 9px;
    font-size: 0.88rem;
}

.class-filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 4px 0 10px;
}

.class-filter-tab {
    padding: 5px 10px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #f5f7fa;
    color: var(--text);
    font-size: 0.9rem;
}

.class-filter-tab.is-active {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent-strong);
    font-weight: 600;
}

.assessment-workspace {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr) 240px;
    gap: 10px;
    align-items: start;
}

.assessment-center {
    display: grid;
    gap: 10px;
}

.assessment-form {
    display: grid;
    gap: 10px;
}

.assessment-sidebar,
.assessment-sidepanel,
.assessment-meta-panel,
.assessment-table-panel,
.assessment-notes-panel {
    padding: 10px;
}

.panel-header-inline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.context-chip {
    padding: 3px 8px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent-strong);
    font-size: 0.85rem;
}

.autosave-status {
    min-width: 92px;
    text-align: center;
    padding: 3px 8px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #f7f8fa;
    color: var(--muted);
    font-size: 0.82rem;
}

.autosave-status.is-saving {
    background: #fff6dc;
    color: #8a5a11;
    border-color: #e3c775;
}

.autosave-status.is-saved {
    background: #e7f4ea;
    color: #2f6a3d;
    border-color: #9ac5a5;
}

.autosave-status.is-error {
    background: #f9e1df;
    color: #8a2e28;
    border-color: #e2a29d;
}

.assessment-list {
    display: grid;
    gap: 6px;
}

.assessment-list-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 34px;
    gap: 6px;
    align-items: start;
}

.assessment-list-item {
    display: grid;
    gap: 2px;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fafbfc;
}

.assessment-list-item.is-active {
    border-color: var(--accent);
    background: var(--accent-soft);
}

.assessment-list-item span {
    color: var(--muted);
    font-size: 0.88rem;
}

.assessment-edit-button {
    width: 34px;
    height: 34px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #f3f5f7;
    color: var(--text);
}

.assessment-mini-form,
.assessment-notes-panel label {
    display: grid;
    gap: 8px;
    margin-top: 10px;
}

.assessment-mini-form {
    position: relative;
    grid-template-columns: auto 1fr auto;
    align-items: center;
}

.mini-save-button {
    grid-column: 2 / 4;
    justify-self: start;
    margin-top: 2px;
}

.mini-form-label {
    font-size: 0.9rem;
    color: var(--muted);
    white-space: nowrap;
}

.calendar-trigger {
    width: 34px;
    height: 34px;
    padding: 0;
    border-color: var(--line);
    background: #f3f5f7;
    color: var(--text);
}

.calendar-popup {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    z-index: 10;
    width: 180px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 8px 24px rgba(17, 24, 39, 0.12);
}

.calendar-popup label {
    display: grid;
    gap: 5px;
}

.mode-toggle {
    display: flex !important;
    align-items: center;
    gap: 8px;
}

.mode-toggle input {
    width: auto;
}

.score-table-wrap {
    max-height: 720px;
}

.student-columns {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.score-table th:nth-child(2),
.score-table th:nth-child(3),
.score-table th:nth-child(4),
.score-table td:nth-child(2),
.score-table td:nth-child(3),
.score-table td:nth-child(4) {
    width: 64px;
}

.score-table tbody tr:nth-child(even) td {
    background: #f7f8fa;
}

.oral-grid-wrap {
    max-height: 760px;
    overflow: auto;
    scrollbar-width: none;
}

.oral-grid-wrap::-webkit-scrollbar {
    display: none;
}

.oral-grid-table {
    width: 100%;
    table-layout: fixed;
}

.oral-grid-table tbody tr:nth-child(even) td {
    background: #f7f8fa;
}

.oral-grid-table tbody tr:nth-child(even) .sticky-name {
    background: #f7f8fa;
}

.oral-grid-table th,
.oral-grid-table td {
    padding: 5px 4px;
    border-right: 1px solid #d7dee8;
}

.oral-name-head {
    min-height: 112px;
}

.oral-column-head {
    min-width: 44px;
    width: 44px;
}

.oral-cell {
    text-align: center;
}

.oral-grid-table th:last-child,
.oral-grid-table td:last-child {
    border-right: 0;
}

.oral-select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    min-width: 42px;
    width: 42px;
    margin: 0 auto;
    padding: 3px 4px;
    border: none;
    background: transparent;
    text-align: center;
    text-align-last: center;
    cursor: pointer;
}

.oral-select::-ms-expand {
    display: none;
}

.oral-select:focus {
    outline: 2px solid rgba(45, 107, 138, 0.25);
    background: #f8fcff;
}

.oral-legend {
    color: var(--muted);
    font-size: 0.88rem;
}

.seatplan-board {
    position: relative;
    min-height: 0;
    height: 100%;
    border: 1px solid #dbe3eb;
    border-radius: 10px;
    background:
        linear-gradient(90deg, rgba(45, 107, 138, 0.05) 1px, transparent 1px),
        linear-gradient(rgba(45, 107, 138, 0.05) 1px, transparent 1px),
        #fbfcfe;
    background-size: 32px 32px, 32px 32px, auto;
    overflow: hidden;
}

.seat-tile {
    position: absolute;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    gap: 4px;
    padding: 8px 6px 6px;
    border: 1px solid #b9c8d8;
    border-radius: 10px;
    background: #ffffff;
    box-shadow: 0 2px 8px rgba(18, 32, 48, 0.08);
    color: var(--text);
    cursor: default;
    user-select: none;
    --seat-name-size: 15px;
    --seat-class-size: 11px;
    --seat-mark-size: 18px;
    --seat-label-size: 18px;
    overflow: hidden;
}

.seatplan-board.is-editing .seat-tile {
    cursor: grab;
}

.seatplan-board.is-editing .seat-tile:active {
    cursor: grabbing;
}

.seat-tile-student {
    text-align: center;
}

.seat-tile-teacher {
    justify-content: center;
    background: #eef3f7;
    font-weight: 700;
}

.seat-tile-name {
    font-size: var(--seat-name-size);
    line-height: 1.15;
    font-weight: 600;
    width: 100%;
    overflow-wrap: anywhere;
}

.seat-tile-mark {
    min-height: 1.1em;
    margin-top: auto;
    font-size: var(--seat-mark-size);
    font-weight: 700;
    color: var(--accent-strong);
    line-height: 1;
}

.seat-tile-label {
    font-size: var(--seat-label-size);
    line-height: 1.1;
}

.seatplan-size-controls {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.seatplan-size-label {
    color: var(--muted);
    font-size: 0.72rem;
    white-space: nowrap;
}

.seatplan-size-button {
    min-width: 30px;
    padding: 4px 0;
    font-size: 0.9rem;
}

.seatplan-menu {
    position: absolute;
    z-index: 50;
    display: grid;
    gap: 6px;
    padding: 8px;
    border: 1px solid #cfd4db;
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 10px 26px rgba(18, 32, 48, 0.16);
}

.seatplan-menu-button {
    min-width: 56px;
    padding: 6px 10px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #f7f8fa;
    color: var(--text);
}

.seatplan-menu-clear {
    background: #fff5f4;
    border-color: #e1b1ad;
}

.seatplan-shell {
    height: 100vh;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    background: #eef2f6;
}

.seatplan-header {
    padding: 6px 10px;
    border-bottom: 1px solid #d6dee7;
    background: rgba(255, 255, 255, 0.96);
}

.seatplan-topbar {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}

.seatplan-back {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: 1px solid #ccd5df;
    border-radius: 999px;
    background: #fff;
    color: var(--accent-strong);
    font-size: 1rem;
    line-height: 1;
    flex: 0 0 auto;
}

.seatplan-title-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 0 0 auto;
    min-width: 0;
}

.seatplan-title-wrap h1 {
    margin: 0;
    font-size: 1.05rem;
    white-space: nowrap;
    flex: 0 0 auto;
}

.seatplan-toolbar {
    display: grid;
    grid-template-columns: 280px 320px 190px 150px auto;
    gap: 8px;
    align-items: end;
    flex: 1;
    min-width: 0;
}

.seatplan-toolbar-field {
    display: flex;
    align-items: center;
    gap: 6px;
    min-width: 0;
}

.seatplan-toolbar-field span {
    font-size: 0.72rem;
    color: var(--muted);
    white-space: nowrap;
}

.seatplan-toolbar select {
    padding: 5px 8px;
    font-size: 0.9rem;
}

.seatplan-toolbar-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
    min-width: 0;
}


.seatplan-edit-toggle.is-active {
    border-color: var(--accent-strong);
    background: var(--accent-soft);
    color: var(--accent-strong);
}

.seatplan-stage {
    min-height: 0;
    display: grid;
    padding: 8px 10px 10px;
}

.seatplan-empty {
    padding: 24px 16px;
}

.seatplan-toolbar .context-chip,
.seatplan-toolbar-actions .autosave-status,
.seatplan-edit-toggle {
    font-size: 0.88rem;
}

.oral-sticky-average,
.oral-sticky-ue {
    text-align: center;
    border-left: 1px solid #c9d1dc;
    background: #fff;
}

.oral-sticky-average {
    right: 68px;
    min-width: 72px;
    width: 72px;
    max-width: 72px;
}

.oral-sticky-ue {
    right: 0;
    min-width: 68px;
    width: 68px;
    max-width: 68px;
}

.oral-summary-cell {
    font-weight: 600;
}

.oral-grid-table tbody tr:nth-child(even) .oral-sticky-average,
.oral-grid-table tbody tr:nth-child(even) .oral-sticky-ue {
    background: #f7f8fa;
}

.compact-input {
    min-width: 52px;
    padding: 5px 6px;
}

.ue-preview {
    text-align: center;
    background: #f7f8fa;
}

.ue-preview.is-editable {
    background: #fffef2;
}

.score-key-ranges.is-disabled,
.assessment-manual-mode .score-key-ranges {
    opacity: 0.45;
    pointer-events: none;
}

.assessment-manual-mode .points-input {
    background: #f5f6f8;
    color: var(--muted);
}

.student-name {
    font-weight: 500;
}

.student-row.gender-f .student-name,
.student-row.gender-f .sticky-name,
.student-row.gender-w .student-name,
.student-row.gender-w .sticky-name {
    color: #b4234f;
}

.student-row.gender-m .student-name,
.student-row.gender-m .sticky-name {
    color: #1e5aa8;
}

.student-row.gender-neutral .student-name,
.student-row.gender-neutral .sticky-name {
    color: var(--text);
}

.sort-toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.sort-toggle {
    display: flex;
    gap: 4px;
}

.sort-toggle-button {
    padding: 4px 7px;
    border: 1px solid var(--line);
    border-radius: 5px;
    background: #f4f6f8;
    color: var(--text);
    font-size: 0.84rem;
}

.sort-toggle-button.is-active {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent-strong);
}

.side-config {
    display: grid;
    gap: 10px;
}

.side-config label {
    display: grid;
    gap: 4px;
}

.score-key-ranges {
    display: grid;
    gap: 6px;
}

.score-range-row {
    display: grid;
    grid-template-columns: 24px 94px 20px 52px;
    gap: 6px;
    align-items: center;
    font-size: 0.84rem;
}

.score-range-label,
.score-range-separator,
.score-range-max {
    white-space: nowrap;
}

.score-input-wrap {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 18px;
    gap: 4px;
    align-items: center;
}

.score-range-row input {
    min-width: 0;
    padding-right: 8px;
    padding-left: 8px;
    text-align: right;
    appearance: textfield;
    -moz-appearance: textfield;
}

.score-range-row input::-webkit-outer-spin-button,
.score-range-row input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.score-spinner {
    display: grid;
    gap: 2px;
}

.spinner-button {
    width: 18px;
    height: 14px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 4px;
    background: #f3f5f7;
    color: var(--text);
    font-size: 0.72rem;
    line-height: 1;
}

.distribution-panel,
.selected-test-panel {
    margin-top: 14px;
}

.distribution-chart {
    display: grid;
    gap: 6px;
}

.distribution-row {
    display: grid;
    grid-template-columns: 42px 1fr 26px;
    gap: 6px;
    align-items: center;
}

.distribution-label,
.distribution-count {
    font-size: 0.88rem;
}

.distribution-bar-track {
    height: 14px;
    border-radius: 999px;
    background: #eef1f5;
    overflow: hidden;
}

.distribution-bar {
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(90deg, #5ea1c6 0%, #2d6b8a 100%);
}

.overview-toolbar {
    padding: 10px;
    margin-bottom: 10px;
    position: static !important;
    top: auto !important;
    z-index: auto !important;
    overflow: hidden;
    transition: none;
}

.overview-toolbar.is-collapsed {
    height: 0;
    min-height: 0;
    margin: 0;
    padding: 0;
    border: 0;
    opacity: 0;
    pointer-events: none;
}

.overview-toolbar-grid {
    grid-template-columns: 240px 240px 180px auto;
    align-items: end;
}

.overview-panel {
    padding: 10px;
    --gradebook-head-row-height: 50px;
    --gradebook-subhead-top: var(--gradebook-head-row-height);
    position: sticky;
    top: 0;
    z-index: 10;
    background: #fff;
}

.overview-panel .panel-header-inline {
    position: sticky;
    top: 0;
    z-index: 20;
    background: #fff;
    padding-bottom: 8px;
    border-bottom: 1px solid #d7dee8;
}

.overview-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.display-mode-switch {
    display: inline-flex;
    gap: 4px;
    padding: 2px;
    border: 1px solid var(--line);
    border-radius: 7px;
    background: #f5f7fa;
}

.display-mode-button {
    min-width: 56px;
    padding: 6px 10px;
    border: 1px solid transparent;
    border-radius: 5px;
    background: transparent;
    color: var(--text);
}

.display-mode-button.is-active {
    border-color: #2b5971;
    background: var(--accent);
    color: #fff;
}

.gradebook-wrap {
    overflow-x: auto;
    overflow-y: auto;
    max-height: calc(100vh - 125px);
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.gradebook-wrap::-webkit-scrollbar {
    width: 0;
    height: 0;
    display: none;
}

.gradebook-table {
    width: 100%;
    min-width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    table-layout: fixed;
}

.gradebook-spacer-col {
    width: var(--gradebook-spacer-width, 24px);
}

.gradebook-table thead th,
.gradebook-table tfoot th,
.gradebook-table tfoot td {
    position: sticky !important;
    z-index: 2;
    background: #f7f8fa;
}

.gradebook-table thead th {
    top: 0;
    min-width: 38px;
    padding: 4px 3px;
    vertical-align: bottom;
}

.gradebook-table thead tr:first-child th {
    top: 0;
    z-index: 8;
    height: var(--gradebook-head-row-height);
}

.gradebook-table thead tr:nth-child(2) th {
    top: var(--gradebook-subhead-top);
    z-index: 7;
}

.gradebook-group-head {
    height: 31px;
    background: #eef3f7 !important;
    color: var(--accent-strong);
    font-size: 0.84rem;
    text-align: center;
    border-bottom: 1px solid #dbe3eb;
    border-right: 1px solid #cfd7e2;
}

.gradebook-spacer-head,
.gradebook-spacer-cell,
.gradebook-spacer-foot {
    min-width: var(--gradebook-spacer-width, 24px);
    width: var(--gradebook-spacer-width, 24px);
}

.gradebook-spacer-head {
    background: #eef3f7 !important;
    border-right: 1px solid #cfd7e2;
}

.gradebook-spacer-cell,
.gradebook-spacer-foot {
    background: #fff;
    border-right: 1px solid #cfd7e2;
}


.gradebook-subhead-spacer {
    background: #f7f8fa !important;
}

.gradebook-table tfoot th,
.gradebook-table tfoot td {
    bottom: 0;
}

.gradebook-column-head {
    min-width: 38px;
    width: 38px;
    height: 150px;
    border-right: 1px solid #cfd7e2;
}

.gradebook-column-vertical {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    gap: 5px;
    height: 100%;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    white-space: nowrap;
}

.gradebook-column-type {
    color: var(--accent-strong);
    font-size: 0.78rem;
}

.gradebook-stats {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 132px;
    gap: 8px;
}

.gradebook-stats-line {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 0.98rem;
    font-weight: 700;
}

.gradebook-stats-f {
    color: #b4234f;
}

.gradebook-stats-m {
    color: #1e5aa8;
}

.gradebook-stats-d {
    color: var(--muted);
}

.gradebook-stats-total {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
}

.sticky-col {
    position: sticky;
    background: #fff;
    z-index: 5;
}

.gradebook-table tbody tr:nth-child(even) td {
    background: #f7f8fa;
}

.gradebook-table tbody tr:nth-child(even) .sticky-col {
    background: #f7f8fa;
}

.sticky-name {
    left: 0;
    min-width: var(--name-col-width, 126px);
    width: var(--name-col-width, 126px);
    max-width: var(--name-col-width, 126px);
    border-right: 1px solid #c9d1dc;
    white-space: nowrap;
}

.sticky-class {
    left: var(--name-col-width, 126px);
    min-width: var(--class-col-width, 0px);
    width: var(--class-col-width, 0px);
    max-width: var(--class-col-width, 0px);
    border-right: 1px solid #c9d1dc;
    text-align: center;
}

.sticky-level {
    left: calc(var(--name-col-width, 126px) + var(--class-col-width, 0px));
    min-width: 84px;
    width: 84px;
    max-width: 84px;
    border-right: 1px solid #c9d1dc;
    text-align: center;
}

.sticky-avg {
    right: calc(var(--summary-end-col-width, 0px) + var(--summary-col-width, 70px) + (var(--learning-col-width, 58px) * 2));
    min-width: var(--avg-col-width, 70px);
    width: var(--avg-col-width, 70px);
    max-width: var(--avg-col-width, 70px);
    text-align: center;
    border-left: 1px solid #c9d1dc;
}

.sticky-learning-1,
.sticky-learning-2 {
    min-width: var(--learning-col-width, 58px);
    width: var(--learning-col-width, 58px);
    max-width: var(--learning-col-width, 58px);
    text-align: center;
    border-left: 1px solid #c9d1dc;
}

.sticky-learning-group {
    right: calc(var(--summary-end-col-width, 0px) + var(--summary-col-width, 70px));
    min-width: calc(var(--learning-col-width, 58px) * 2);
    width: calc(var(--learning-col-width, 58px) * 2);
    background: #eef3f7 !important;
    text-align: center;
    border-left: 1px solid #c9d1dc;
}

.sticky-learning-2 {
    right: calc(var(--summary-end-col-width, 0px) + var(--summary-col-width, 70px));
}

.sticky-learning-1 {
    right: calc(var(--summary-end-col-width, 0px) + var(--summary-col-width, 70px) + var(--learning-col-width, 58px));
}

.sticky-summary {
    right: var(--summary-end-col-width, 0px);
    min-width: var(--summary-col-width, 78px);
    width: var(--summary-col-width, 78px);
    max-width: var(--summary-col-width, 78px);
    text-align: center;
    border-left: 1px solid #c9d1dc;
}

.sticky-summary-end {
    right: 0;
    min-width: var(--summary-end-col-width, 78px);
    width: var(--summary-end-col-width, 78px);
    max-width: var(--summary-end-col-width, 78px);
    text-align: center;
    border-left: 1px solid #c9d1dc;
}

.gradebook-cell {
    padding: 0;
    border-right: 1px solid #c5cfdb;
}

.gradebook-input {
    border: none;
    border-radius: 0;
    min-width: 38px;
    width: 38px;
    padding: 6px 2px;
    text-align: center;
    background: transparent;
}

.gradebook-summary-input {
    min-width: 70px;
    width: 70px;
}

.gradebook-learning-head,
.gradebook-learning-input {
    min-width: var(--learning-col-width, 58px);
    width: var(--learning-col-width, 58px);
}

.gradebook-learning-head {
    height: 150px;
    padding: 0;
    vertical-align: bottom;
    border-right: 1px solid #cfd7e2;
}

.sticky-summary.gradebook-learning-head,
.sticky-summary-end.gradebook-learning-head {
    min-width: var(--summary-col-width, 70px);
    width: var(--summary-col-width, 70px);
    max-width: var(--summary-col-width, 70px);
}

.gradebook-input:focus {
    outline: 2px solid rgba(45, 107, 138, 0.25);
    background: #f8fcff;
}

.gradebook-input-readonly {
    cursor: default;
}

.gradebook-input-readonly:focus {
    outline: none;
    background: transparent;
}

.gradebook-grade-alert {
    color: #b4234f !important;
    font-weight: 700;
}

.gradebook-level-select {
    min-width: 0;
    width: 100%;
    padding: 4px 6px;
    border: none;
    border-radius: 0;
    text-align: center;
    background: transparent;
}

.gradebook-level-select:focus {
    outline: 2px solid rgba(45, 107, 138, 0.25);
    background: #f8fcff;
}

.points-input {
    appearance: textfield;
    -moz-appearance: textfield;
}

.points-input::-webkit-outer-spin-button,
.points-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.gradebook-table th,
.gradebook-table td {
    padding: 4px 4px;
}

.gradebook-table tbody td,
.gradebook-table thead th,
.gradebook-table tfoot th {
    border-bottom: 1px solid #d7dee8;
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(28, 35, 44, 0.36);
}

.modal-card {
    width: min(420px, calc(100vw - 32px));
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #fff;
    box-shadow: 0 18px 42px rgba(17, 24, 39, 0.22);
}

.modal-close {
    min-width: 34px;
    padding: 0;
}

.add-column-modal-form {
    display: grid;
    gap: 10px;
}

.add-column-modal-form label {
    display: grid;
    gap: 5px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.modal-actions-between {
    justify-content: space-between;
    align-items: center;
}

.login-body {
    background:
        radial-gradient(circle at top left, rgba(45, 107, 138, 0.18), transparent 34%),
        linear-gradient(180deg, #eef3f7 0%, #e4eaef 100%);
}

.login-shell {
    min-height: calc(100vh - 92px);
    display: grid;
    place-items: center;
    padding: 12px 0;
}

.login-card {
    width: min(420px, 100%);
    padding: 18px;
    box-shadow: 0 16px 36px rgba(18, 32, 48, 0.08);
}

.login-form {
    gap: 10px;
}

@media (max-width: 1100px) {
    .toolbar-grid-compact,
    .assessment-workspace,
    .student-columns,
    .overview-toolbar-grid,
    .stats-grid,
    .two-columns {
        grid-template-columns: 1fr;
    }

    .seatplan-toolbar {
        grid-template-columns: 1fr 1fr;
    }

    .seatplan-topbar,
    .seatplan-toolbar-actions,
    .seatplan-title-wrap,
    .seatplan-stage-head {
        justify-content: flex-start;
        flex-wrap: wrap;
    }

    .seatplan-toolbar-field {
        display: grid;
        gap: 5px;
    }
}

@media (max-width: 700px) {
    .topbar {
        position: sticky;
        top: 0;
    }

    .topbar-row {
        display: grid;
        grid-template-columns: auto auto;
        align-items: center;
        gap: 8px;
        padding: 8px 10px 6px;
    }

    .topbar-actions {
        margin-left: auto;
        justify-self: end;
    }

    .nav-main {
        grid-column: 1 / -1;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 2px;
        scrollbar-width: none;
        -ms-overflow-style: none;
        white-space: nowrap;
    }

    .nav-main::-webkit-scrollbar {
        display: none;
    }

    .nav-main a {
        flex: 0 0 auto;
        padding: 5px 8px;
        border: 1px solid #d7dee8;
        background: #f7f9fb;
        font-size: 0.9rem;
    }

    .topbar-actions .button,
    .install-button {
        min-height: 34px;
        padding: 6px 10px;
        font-size: 0.88rem;
    }

    .content {
        padding: 10px 10px 18px;
    }

    .page-header {
        margin-bottom: 10px;
    }

    .flash {
        padding: 8px 10px;
    }

    .install-hint {
        padding: 8px 10px;
        font-size: 0.88rem;
    }

    .login-shell {
        min-height: calc(100vh - 72px);
    }

    .login-card {
        padding: 14px;
    }
}