style.css

html {
    height: 100%;
    font-family: sans-serif;
}
noscript p {
    text-align: center;
}
noscript .large {
    font-size: 200%;
}
body {
    min-height: 100%;
    width: 100%;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-y: scroll;
    --tint: rgba(0, 0, 0, 0.1);
    --heavy-tint: rgba(0, 0, 0, 0.2);
    --text-color-loading: hsl(0, 0%, 40%);
    --text-color-disabled: gray;
    --toolbar-outline-color: black;
    --menu-color: hsl(0, 0%, 80%);
    --menu-color-heavy: hsl(0, 0%, 65%);
    --menu-color-heavy2: hsl(0, 0%, 55%);
    --menu-color-heavy3: hsl(0, 0%, 45%);
    --bar-color: hsla(0, 0%, 80%, 0.8);
    --large-shadow: 0 4px 8px rgba(0,0,0,0.4), 0 4px 12px 4px rgba(0,0,0,0.2);
    --small-shadow: 0 1px 2px rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15);
    --bin-outline-color: rgba(0, 0, 0, 0.3);
    --grid-color: rgba(0, 0, 0, 0.1);
    --bin-shadow-dims: 0 0 4px 1px;
}
body.dark {
    background-color: hsl(0, 0%, 12%);
    color: var(--text-color);
    fill: var(--text-color);
    --tint: rgba(255, 255, 255, 0.1);
    --heavy-tint: rgba(255, 255, 255, 0.2);
    --text-color: hsl(0, 0%, 80%);
    --text-color-loading: hsl(0, 0%, 50%);
    --text-color-disabled: hsl(0, 0%, 40%);
    --toolbar-outline-color: hsl(0, 0%, 45%);
    --menu-color: hsl(0, 0%, 20%);
    --menu-color-heavy: hsl(0, 0%, 30%);
    --menu-color-heavy2: hsl(0, 0%, 40%);
    --menu-color-heavy3: hsl(0, 0%, 50%);
    --bar-color: hsla(0, 0%, 20%, 0.8);
    --large-shadow: 0 4px 8px rgba(255,255,255,0.4), 0 4px 12px 4px rgba(255,255,255,0.2);
    --small-shadow: 0 1px 2px rgba(255,255,255,0.3), 0 1px 3px 1px rgba(255,255,255,0.15);
    --bin-outline-color: hsla(0, 0%, 100%, 0.3);
    --grid-color: hsla(0, 0%, 100%, 0.1);
    --bin-shadow-dims: 0 0 4px 2px;
}
.dark a {
    color: rgb(65, 175, 235);
}
a:not(:hover) {
    text-decoration: none;
}
.light .dark-only, .dark .light-only {
    display: none;
}
#arena {
    position: relative;
    display: flex;
    align-self: center;
    align-items: flex-start;
    margin: 32px;
}
#arena.large {
    align-self: flex-start;
}
body > .gas {
    flex-grow: 1;
}
footer {
    font-size: 1.25rem;
    position: sticky;
    bottom: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    z-index: 15;
}

.show-bins-only #main-header, .show-bins-only footer, .show-bins-only #inventory,
    .show-bins-only #modal-group, .show-bins-only .bin:empty {
    display: none;
}
.show-bins-only #arena, .dark.show-bins-only #arena, .light.show-bins-only #arena {
    margin: 0;
    box-shadow: none;
    outline: none;
}
#inventory {
    margin: 10px;
    flex-shrink: 0;
    position: relative;
}
#packing-area {
    padding: 5px;
    display: flex;
    align-items: flex-start;
    flex-direction: row;
    flex-wrap: wrap;
}
#arena-separator {
    width: 0px;
    border: 1px solid var(--bin-outline-color);
    align-self: stretch;
    margin: 0 10px;
}

.bin {
    position: relative;
    margin: 5px;
}
.bin-touch .bin {
    touch-action: none;
}

.item {
    position: absolute;
    z-index: 30;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: space-around;
}
.dark .item {
    filter: brightness(0.9);
}
.item-touch .item {
    touch-action: none;
}
.light .item.moving {
    box-shadow: var(--large-shadow);
}
.dark .item.moving {
    filter: none;
}
.show-id .item::after {
    content: attr(data-item-id);
}
.bin .item {
    z-index: 10;
}

#hover-rect {
    visibility: hidden;
    position: fixed;
    z-index: 20;
}

#item-info-bar {
    bottom: 2em;
}
#item-info-bar.disabled {
    display: none;
}
.bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}
.bar-entry {
    display: flex;
    align-items: center;
    height: 2em;
}
.bar-label::after {
    content: ":";
}
.bar-label, .bar-value {
    padding: 3px 5px 3px 5px;
}
.light .bar-value.error {
    color: #721c24;
    background-color: #f5c6cb;
}
.light .bar-value.warning {
    color: #856404;
    background-color: #ffeeba;
}
.light .bar-value.success {
    color: #155724;
    background-color: #c3e6cb;
}
.dark .bar-value.error {
    background-color: #721c24;
    color: #f5c6cb;
}
.dark .bar-value.warning {
    background-color: #856404;
    color: #ffeeba;
}
.dark .bar-value.success {
    background-color: #155724;
    color: #c3e6cb;
}

/* beautification */

.dark input[type="text"], .dark textarea {
    background-color: hsl(0, 0%, 10%);
    color: var(--text-color);
}
.dark input[type="text"]::placeholder {
    color: var(--text-color-disabled);
}
.light #arena, .light .item {
    box-shadow: var(--small-shadow);
}
.dark #arena {
    outline: 2px solid var(--bin-outline-color);
}
#inventory, .bin {
    outline: 1px solid var(--bin-outline-color);
}
.bin[data-bin-type] {
    outline: none;
}
.bin[data-bin-type="good"] {
    box-shadow: var(--bin-shadow-dims) rgb(0, 165, 40);
}
.bin[data-bin-type="warning"] {
    box-shadow: var(--bin-shadow-dims) rgb(191, 124, 0);
}
.bin[data-bin-type="danger"] {
    box-shadow: var(--bin-shadow-dims) rgb(191, 0, 0);
}
.bar {
    background-color: var(--bar-color);
}

.item {
    opacity: 70%;
    border: 1px solid rgba(0, 0, 0, 0.25);
}
.bin .item {
    opacity: 90%;
    box-shadow: none;
}
.light #hover-rect.success {
    background-color: rgba(40, 167, 69, 0.5);
}
.light #hover-rect.failure {
    background-color: rgba(220, 53, 69, 0.5);
}
.dark #hover-rect.success {
    background-color: hsla(134, 61%, 25%, 0.5);
}
.dark #hover-rect.failure {
    background-color: hsla(354, 70%, 35%, 0.5);
}
#inventory, .bin {
    background-image: linear-gradient(to right, var(--grid-color) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-color) 1px, transparent 1px);
    background-position: -0.5px -0.5px;
}
#downloader {
    display: none;
}

/* controls */

#main-header {
    display: flex;
    flex-direction: column;
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    z-index: 40;
}
.icon {
    max-height: 1.75rem;
    max-width: 1.75rem;
}
.toolbar {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    align-self: center;
}
.toolbar > li {
    display: flex;
    align-items: center;
    justify-content: space-around;
    box-sizing: border-box;
    min-width: 3rem;
    min-height: 3rem;
    user-select: none;
    background-color: var(--menu-color);
    border-left: 1px solid var(--toolbar-outline-color);
    border-bottom: 1px solid var(--toolbar-outline-color);
    flex-direction: column;
}
.toolbar > li > svg {
    margin: 0.25rem;
    max-width: 1.8rem;
    max-height: 1.8rem;
}
.toolbar > li > .label {
    font-size: 0.75rem;
    margin: 0.1rem 0.2rem;
}
.toolbar > li:not(.disabled) {
    cursor: pointer;
}
.toolbar > li.disabled {
    color: var(--text-color-disabled);
    fill: var(--text-color-disabled);
}
.toolbar > li:not(.disabled):hover, .toolbar > li:not(.disabled).pressed {
    background-color: var(--menu-color-heavy);
}
.toolbar > li:not(.disabled):active, .toolbar > li:not(.disabled).pressed:hover {
    background-color: var(--menu-color-heavy2);
}
.toolbar > li:not(.disabled).pressed:active {
    background-color: var(--menu-color-heavy3);
}
.toolbar > li:last-child {
    border-right: 1px solid var(--toolbar-outline-color);
}

.menu header {
    display: flex;
    overflow: hidden;
    align-self: stretch;
    flex-shrink: 0;
    border-bottom: 1px solid var(--heavy-tint);
    border-radius: 0.5rem 0.5rem 0 0;
}
.menu .heading {
    font-size: 1.2em;
    padding: 0.5rem 1rem;
    display: flex;
    flex-grow: 1;
    justify-content: space-around;
}
.menu-body {
    overflow-y: auto;
}
.menu-body p {
    margin: 1em;
    max-width: 640px;
}
.menu.disabled, .toolbar.disabled {
    display: none;
}
.menu {
    background-color: var(--menu-color);
    border-radius: 0.5rem;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-self: center;
    align-items: stretch;
    max-height: 100%;
}
form.menu > .options {
    padding: 0 2rem;
}
form.menu .input-pair, form.menu p {
    margin: 0.5rem 0;
}
.input-pair {
    display: flex;
    align-items: baseline;
}
input[type="text"] {
    padding: 0.375rem 0.75rem;
    border: none;
    border-radius: 0.25rem;
    font-size: 1em;
}
.input-pair > input[type="radio"] {
    margin: 0 0.5rem 0 0;
}
.input-pair > input[type="text"] {
    margin: 0 0 0 1rem;
    flex-grow: 1;
}
.input-pair > label {
    flex-grow: 0;
}
textarea {
    width: calc(100% - 2.5rem);
    margin-left: 1rem;
    margin-right: 1rem;
}
button[type="submit"] {
    margin: 0.25rem 0 0.5rem 0;
    align-self: center;
    padding: 0.2rem 1rem;
    font-size: 1rem;
}
.menu > ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}
#solutions-menu li, #auto-pack-menu li {
    font-family: monospace;
    font-size: 1.1rem;
}
.menu > ul > li {
    cursor: pointer;
    padding: 0.8rem 1rem;
    display: flex;
    justify-content: space-around;
}
.menu > ul > li:last-child {
    border-radius: 0 0 0.5rem 0.5rem;
}
.menu > ul > li:hover {
    background-color: var(--menu-color-heavy);
}
.menu > ul > li:active {
    background-color: var(--menu-color-heavy2);
}

#msg-list {
    margin: 0;
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-self: stretch;
}
#msg-list > li {
    display: flex;
    background-color: var(--menu-color);
    border-radius: 0.3em;
    margin: 0.6em;
    margin-bottom: 0;
    overflow: hidden;
}
.msg-text {
    flex-grow: 1;
    padding: 0.6em 1em;
}
.light #msg-list > li.error {
    color: #721c24;
    background-color: #f8d7da;
}
.light #msg-list > li.warning {
    color: #856404;
    background-color: #fff3cd;
}
.light #msg-list > li.success {
    color: #155724;
    background-color: #d4edda;
}
.dark #msg-list > li.error {
    background-color: #721c24;
    color: #f8d7da;
}
.dark #msg-list > li.warning {
    background-color: #856404;
    color: #fff3cd;
}
.dark #msg-list > li.success {
    background-color: #155724;
    color: #d4edda;
}
.close-btn, .back-btn {
    font-size: 1.5em;
    flex-grow: 0;
    width: 2.5rem;
    align-self: stretch;
    display: flex;
    align-items: center;
    justify-content: space-around;
    cursor: pointer;
    user-select: none;
}
.close-btn::before {
    content: "×";
    transform: rotate(90deg);
}
.back-btn::before {
    content: "➔";
    transform: scale(-1, 1);
}
.close-btn:hover, .back-btn:hover {
    background-color: var(--tint);
}
.close-btn:active, .back-btn:active {
    background-color: var(--heavy-tint);
}

#celebrate-canvas {
    position: fixed;
    top: 0;
    z-index: 1000;
    pointer-events: none;
}

#modal-group {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 2000;
    pointer-events: none;
}
#modal-group > .overlay {
    position: fixed;
    z-index: 1990;
    width: 100%;
    height: 100%;
}
.menu:not(.disabled) ~ .overlay {
    pointer-events: auto;
    background-color: hsla(0, 0%, 10%, 0.8);
}
#modal-group > .menu {
    z-index: 2010;
    pointer-events: auto;
    box-shadow: var(--large-shadow);
}
#modal-group.loading > .menu {
    color: var(--text-color-loading);
}
#modal-group > .gas {
    width: 100%;
    height: 100px;
    flex-shrink: 9999999;
}