:root {
    --text: #1f2328;
    --muted: #59636e;
    --border: #d1d9e0;
    --background: #ffffff;
    --surface: #f6f8fa;
    --accent: #0969da;
    --error: #cf222e;
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --text: #e6edf3;
        --muted: #9198a1;
        --border: #3d444d;
        --background: #0d1117;
        --surface: #151b23;
        --accent: #4493f8;
        --error: #f85149;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0 auto;
    max-width: 88rem;
    padding: 1rem;
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    line-height: 1.5;
    color: var(--text);
    background: var(--background);
}

header p,
.note {
    color: var(--muted);
}

section {
    margin: 1.5rem 0;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
}

h1, h2, h3 {
    margin-top: 0;
}

label {
    display: inline-flex;
    flex-direction: column;
    gap: 0.25rem;
    margin: 0 1rem 0.75rem 0;
}

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

input, select, textarea {
    padding: 0.3rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--background);
}

textarea {
    display: block;
    width: 100%;
    margin-top: 0.5rem;
    font-family: ui-monospace, "SF Mono", Menlo, monospace;
    font-size: 0.9em;
}

button {
    padding: 0.4rem 0.9rem;
    margin: 0.25rem 0.5rem 0.25rem 0;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
    cursor: pointer;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

/* The objective, the bin types and the item types of the form, separated
   from each other. */
.form-group {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.form-group h3 {
    margin-bottom: 0.5rem;
}

/* The buttons to solve and stop, and the status: at the bottom of the window
   while the form is scrolled, so that they stay at hand. */
#actions {
    position: sticky;
    bottom: 0;
    z-index: 10;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    /* Across the padding of the body, so that the content scrolled below it
       is hidden. */
    margin: 0 -1rem;
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border);
    background: var(--background);
}

#actions button {
    margin: 0;
    padding: 0.5rem 1.5rem;
}

#solve {
    border-color: var(--accent);
    background: var(--accent);
    color: #ffffff;
}

table {
    border-collapse: collapse;
    margin-bottom: 0.5rem;
}

th, td {
    padding: 0.25rem 0.5rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

table.types input[type="number"] {
    width: 7rem;
}

.error {
    padding: 0.75rem 1rem;
    border: 1px solid var(--error);
    border-radius: 6px;
    color: var(--error);
}

#status {
    margin-left: 0.5rem;
    /* The elapsed time doesn't move the text after it. */
    font-variant-numeric: tabular-nums;
}

/* The key numbers of the solution: a tile each, on one row (wrapped on
   narrow windows). */
.stat-tiles {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.stat-tile {
    min-width: 8rem;
    padding: 0.5rem 0.9rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
}

.stat-label {
    color: var(--muted);
    font-size: 0.85em;
}

/* Proportional figures: a standalone number. */
.stat-value {
    font-size: 1.4rem;
    font-weight: 600;
    line-height: 1.3;
}

.stat-note {
    color: var(--muted);
    font-size: 0.85em;
}

.dimensions {
    display: flex;
    gap: 0.5rem;
}

label.inline {
    flex-direction: row;
    align-items: center;
    margin: 0;
}

table.types .dimensions input[type="number"] {
    width: 5.5rem;
}

input.vertices.general {
    width: 32rem;
}

input.vertices {
    width: 22rem;
    font-family: ui-monospace, "SF Mono", Menlo, monospace;
}

.dimensions button {
    margin: 0;
    white-space: nowrap;
}

.file-description {
    align-self: center;
    max-width: 24rem;
    font-size: 0.9em;
}

/* Fields with one value: the key and the value on the same line, one field
   per line. */
.fields {
    display: grid;
    /* The same width for the keys of all the groups, so that their values
       are aligned. */
    grid-template-columns: minmax(17rem, max-content) minmax(0, 26rem);
    align-items: center;
    gap: 0.5rem 1rem;
    margin-bottom: 1rem;
}

.fields label {
    display: block;
    margin: 0;
}

.fields input[type="checkbox"] {
    justify-self: start;
}

/* Its fields are in the grid of its parent. */
#instance-parameters:not([hidden]) {
    display: contents;
}

@media (max-width: 30rem) {
    .fields {
        grid-template-columns: minmax(0, 1fr);
        row-gap: 0.25rem;
    }
}

.checkboxes {
    display: grid;
    grid-template-columns: repeat(3, auto);
    column-gap: 0.75rem;
    font-family: ui-monospace, "SF Mono", Menlo, monospace;
    font-size: 0.9em;
}

.checkboxes.single-column {
    grid-template-columns: auto;
}

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

/* The defects of a bin type or the holes of an item type, on a line below
   it. */
tr.placed-shapes-line td {
    padding-left: 1.5rem;
}

.placed-shapes-label {
    display: inline-block;
    margin-right: 1rem;
    color: var(--muted);
    vertical-align: top;
    padding-top: 0.4rem;
}

.placed-shapes {
    display: inline-flex;
    flex-direction: column;
    gap: 0.3rem;
}

.placed-shapes button {
    margin: 0;
    align-self: flex-start;
}

td.row-buttons {
    white-space: nowrap;
}

/* A number which can be unlimited, and its checkbox. */
.unlimited {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* The cutting costs of the rectangleguillotine problem type. */
.cutting-costs table {
    width: auto;
}

.cutting-costs th, .cutting-costs td {
    padding: 0.15rem 0.5rem 0.15rem 0;
}

.cutting-costs tbody th {
    font-weight: normal;
    text-align: left;
    white-space: nowrap;
}

.cutting-costs input {
    width: 7rem;
}

.cutting-costs button {
    margin: 0.25rem 0.5rem 0 0;
}

/* A second line in a header of a table. */
.header-note {
    font-weight: normal;
    font-size: 0.85em;
    color: var(--muted);
    white-space: nowrap;
}

/* The details of a row, on a line below it. */
tr.details-line td {
    padding-left: 1.5rem;
}

.details {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem 1.25rem;
}

.details label.inline {
    gap: 0.4rem;
}

.details input[type="number"] {
    width: 7rem;
}

.details input.ids {
    width: 10rem;
}

/* A hole of a defect, below it. */
.dimensions.hole-line {
    padding-left: 1.5rem;
}

/* The id of a row. */
td.row-id {
    color: var(--muted);
    font-variant-numeric: tabular-nums;
    text-align: right;
}

input.item-type-id {
    width: 4rem;
}

/* The resources of a bin type, and their consumptions below them. */
.dimensions.resource, .dimensions.consumption-line {
    flex-wrap: wrap;
}

.dimensions.consumption-line {
    padding-left: 1.5rem;
}

/* A field of the details of the row isn't at its default value. */
.row-buttons button.modified::after {
    content: " •";
    color: var(--accent);
}

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

/* The thumbnail of a row of the irregular form. */
svg.thumbnail {
    display: block;
    width: 4.5rem;
    height: 3rem;
}

svg.thumbnail.invalid {
    border: 1px dashed var(--error);
    border-radius: 4px;
}

#plot {
    width: 100%;
}

#progress {
    font-variant-numeric: tabular-nums;
}

#progress-chart {
    width: 100%;
    margin-bottom: 0.5rem;
}

#progress-details summary {
    cursor: pointer;
    color: var(--muted);
    margin-bottom: 0.5rem;
}

/* Examples of solutions, at the top of the page. */
#gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin: 1rem 0 0.5rem;
}

#gallery button {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin: 0;
    padding: 0.5rem;
    text-align: left;
}

#gallery button[aria-pressed="true"] {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}

#gallery img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: contain;
    background: #ffffff;
    border-radius: 4px;
}

#gallery span {
    color: var(--muted);
    font-size: 0.85em;
}

@media (max-width: 48rem) {
    #gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 30rem) {
    #gallery {
        grid-template-columns: 1fr;
    }
}

/* The projects on the left of the page, the form and the results on the
   right; the projects above them on narrow windows. */
#layout {
    display: grid;
    grid-template-columns: 15rem minmax(0, 1fr);
    gap: 0 1.5rem;
    align-items: start;
}

#sidebar {
    position: sticky;
    top: 1rem;
    margin: 1.5rem 0;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
}

#sidebar > label {
    display: block;
    margin: 0 0 0.25rem;
}

#sidebar select {
    width: 100%;
    margin-bottom: 1rem;
}

#sidebar h2 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

@media (max-width: 60rem) {
    #layout {
        grid-template-columns: minmax(0, 1fr);
    }

    #sidebar {
        position: static;
        margin-bottom: 0;
    }
}

.project-list {
    margin: 0.5rem 0 0;
    padding: 0;
    list-style: none;
}

.project-list button {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.5rem;
    width: 100%;
    margin: 0 0 0.25rem;
    padding: 0.35rem 0.6rem;
    border-color: transparent;
    background: transparent;
    text-align: left;
    overflow-wrap: anywhere;
}

.project-list button:hover {
    background: var(--surface);
}

.project-list button[aria-current="true"] {
    border-color: var(--accent);
    background: var(--surface);
}

/* "Solving", after the name of a project. */
.project-tag {
    flex-shrink: 0;
    color: var(--muted);
    font-size: 0.8em;
}

.project-tag.solving {
    color: var(--accent);
}

/* The examples, which can be folded, above the projects. */
#examples {
    margin: 0 0 0.5rem;
}

/* The sidebar stays in view (sticky): the examples scroll in a box. */
#example-list {
    position: relative;
    max-height: 40vh;
    overflow-y: auto;
    border-block: 1px solid var(--border);
    padding-top: 0.25rem;
}

#examples summary {
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: bold;
}

#example-link-error:empty {
    display: none;
}

#no-projects {
    margin: 0.25rem 0 0.75rem;
}

.sidebar-buttons button {
    width: 100%;
    margin: 0 0 0.5rem;
}

#load-json-error {
    margin: 0 0 0.5rem;
}

#load-json-error:empty {
    display: none;
}

/* The name of the project and its buttons. */
#project-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 1rem;
    margin-bottom: 0.5rem;
}

#project-header h2 {
    margin: 0;
    overflow-wrap: anywhere;
}

#project-name-input {
    font-size: 1.25rem;
    min-width: 16rem;
}

#project-header .buttons button {
    margin: 0 0.5rem 0 0;
}

/* The form, without the look of a fieldset. */
fieldset#form-fields {
    min-width: 0;
    margin: 0;
    padding: 0;
    border: 0;
}

/* The first error of the form, below it. */
#form-error:empty {
    display: none;
}

/* The invalid fields of the form; their error is their tooltip. */
.invalid input:not([type="checkbox"]),
.invalid select,
input.invalid,
select.invalid {
    border-color: var(--error);
    box-shadow: 0 0 0 1px var(--error);
}

/* The rotations of a row: a cell of checkboxes. */
td.invalid .checkboxes {
    outline: 1px solid var(--error);
    outline-offset: 2px;
    border-radius: 4px;
}

/* The defects or the resources of a row: their label, not all their
   fields. */
tr.placed-shapes-line.invalid .invalid,
tr.placed-shapes-line.invalid input:not([type="checkbox"]) {
    border-color: var(--border);
    box-shadow: none;
}

tr.placed-shapes-line.invalid .placed-shapes-label,
.row-buttons button.invalid {
    color: var(--error);
}

.row-buttons button.invalid {
    border-color: var(--error);
}

/* What was pasted in a table. */
#paste-status:empty {
    display: none;
}

.paste-hint {
    margin: 0.25rem 0 0;
    font-size: 0.85em;
}

/* The visualizer of the solutions ('viewer/'): an overview of the bins, and
   a view of one bin below it. */
.viewer:focus {
    outline: none;
}

.viewer-summary {
    margin: 0 0 0.5rem;
    color: var(--muted);
}

/* The bins of the overview: a grid, scrolled if it is high. */
.viewer-overview {
    position: relative;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(8rem, 1fr));
    gap: 0.5rem;
    max-height: 22rem;
    overflow-y: auto;
    padding: 2px;
    margin-bottom: 1rem;
}

.viewer-cell {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin: 0;
    padding: 0.35rem;
    background: var(--background);
}

.viewer-cell svg {
    width: 100%;
    height: 6rem;
}

.viewer-cell[aria-pressed="true"] {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}

.viewer-cell-caption {
    font-size: 0.85em;
    color: var(--muted);
    text-align: center;
}

/* The number of copies of a bin ("×4"). */
.viewer-copies {
    font-weight: 600;
    color: var(--text);
}

.viewer-detail-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.viewer-detail-header button {
    margin: 0;
    padding: 0.2rem 0.8rem;
    font-size: 1.1rem;
}

.viewer-detail-image svg {
    display: block;
    width: 100%;
    max-height: 70vh;
}

/* The shapes of a bin: lines of 1 pixel whatever the zoom. */
.viewer-bin path {
    vector-effect: non-scaling-stroke;
    stroke-width: 1;
}

.viewer-bin-outline {
    fill: var(--background);
    stroke: var(--text);
}

.viewer-item {
    stroke: #1f2328;
}

.viewer-bin.detail .viewer-item:hover {
    stroke-width: 2.5;
}

.viewer-defect {
    fill: crimson;
    stroke: crimson;
}

/* The isometric views of box and boxstacks ('render3d.js'). */
.viewer-bin-3d polygon,
.viewer-bin-3d line {
    vector-effect: non-scaling-stroke;
    stroke-width: 1;
    stroke-linejoin: round;
}

.viewer-bin-3d .viewer-item polygon {
    stroke: #1f2328;
}

.viewer-bin-floor,
.viewer-bin-wall {
    fill: var(--surface);
    stroke: var(--muted);
}

.viewer-bin-edge {
    stroke: var(--text);
}

.viewer-defect-face {
    fill: crimson;
    fill-opacity: 0.6;
    stroke: crimson;
}

.viewer-bin-3d.detail .viewer-item:hover polygon {
    filter: brightness(1.15);
}

.viewer-trim {
    fill: var(--muted);
    fill-opacity: 0.35;
    stroke: none;
}

.viewer-waste {
    fill: var(--muted);
    fill-opacity: 0.15;
    stroke: none;
}

.viewer-residual {
    fill: none;
    stroke: none;
}

.viewer-cut {
    fill: none;
    stroke: var(--text);
    stroke-opacity: 0.6;
}

.viewer-item-label {
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    text-anchor: middle;
    dominant-baseline: central;
    fill: #1f2328;
    /* Not the stroke of its item (in the isometric views). */
    stroke: none;
    pointer-events: none;
}

/* The bins of onedimensional: a row each, at the same scale. */
.viewer-rows {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 70vh;
    overflow-y: auto;
}

.viewer-row {
    display: grid;
    grid-template-columns: 6rem minmax(0, 1fr);
    align-items: center;
    gap: 0.5rem;
}

.viewer-row-caption {
    font-size: 0.85em;
    color: var(--muted);
    white-space: nowrap;
}

.viewer-row-bin {
    position: relative;
    height: 1.6rem;
    border: 1px solid var(--text);
    background: var(--background);
}

.viewer-row-item {
    position: absolute;
    top: 0;
    bottom: 0;
    overflow: hidden;
    border-right: 1px solid #1f2328;
    font-size: 0.75em;
    line-height: 1.5rem;
    color: #1f2328;
    text-align: center;
    white-space: nowrap;
}

/* The title of a page, and the links to the project on its right (below it
   on narrow windows). */
.page-title {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem 1rem;
    margin-bottom: 0.5rem;
}

.page-title h1 {
    margin: 0;
}

.project-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* A link shown as a rounded button, with an icon. */
.link-button {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    color: var(--text);
    font-size: 0.9em;
    text-decoration: none;
}

.link-button svg {
    flex-shrink: 0;
    fill: currentColor;
}

.link-button:hover,
.link-button:focus-visible {
    border-color: var(--accent);
    color: var(--accent);
}

a {
    color: var(--accent);
}