:root {
    color-scheme: light;
    --bg: #ffffff;
    --surface: rgb(248 250 252 / 94%);
    --surface-border: rgb(202 211 219 / 75%);
    --text: #1a1d20;
    --text-muted: #5e6974;
    --accent: #4b5563;
    --danger: #b42323;
    --warning: #9a5b00;
    --radius: 8px;
    --chrome-gap: 10px;
    --transport-height: 40px;
    font-family:
        Inter,
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    font-size: 14px;
    background: var(--bg);
    color: var(--text);
}

* {
    box-sizing: border-box;
}

/* Shoelace spike: align component design tokens with the viewer theme. */
:root {
    --sl-input-height-small: 30px;
    --sl-border-radius-small: 6px;
    --sl-border-radius-medium: 6px;
    --sl-font-sans:
        Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
        "Segoe UI", sans-serif;
    --sl-color-primary-500: #5e6974;
    --sl-color-primary-600: #4b5563;
    --sl-color-primary-700: #3b424c;
    --sl-input-focus-ring-color: rgb(75 85 99 / 35%);
}

body {
    margin: 0;
    min-width: 320px;
    min-height: 100vh;
    overflow: hidden;
}

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

button,
.asset-load-row select,
.loaded-file-control select,
.clear-loaded-file,
.load-menu > summary {
    min-height: 30px;
    border: 1px solid var(--surface-border);
    border-radius: 6px;
    background: rgb(255 255 255 / 92%);
    color: var(--text);
    cursor: pointer;
}

.asset-load-row select,
.loaded-file-control select {
    background: rgb(255 255 255 / 92%);
    color: var(--text);
}

.material-symbols-rounded {
    font-family: "Material Symbols Rounded";
    font-size: 20px;
    font-weight: normal;
    font-style: normal;
    line-height: 1.2;
    letter-spacing: 0;
    text-transform: none;
    white-space: nowrap;
    direction: ltr;
    font-feature-settings: "liga";
}

button:hover,
.load-menu > summary:hover {
    background: rgb(246 247 248 / 98%);
}

button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.viewer-shell {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background: var(--bg);
}

.stage,
#viewer-canvas {
    width: 100%;
    height: 100%;
}

.stage {
    position: absolute;
    inset: 0;
}

#viewer-canvas {
    display: block;
}

.top-bar,
.transport {
    position: absolute;
    z-index: 2;
}

.top-bar {
    top: var(--chrome-gap);
    left: var(--chrome-gap);
    display: flex;
    justify-content: start;
    gap: 8px;
    align-items: center;
    right: calc(var(--chrome-gap) + 150px);
    min-height: var(--top-bar-height);
    padding: 5px 7px;
}

.status {
    flex: 1 1 auto;
    min-width: 0;
    max-width: min(30vw, 360px);
    padding: 0 4px;
    color: var(--text-muted);
    font-size: 12px;
}

.top-bar.is-error .status {
    color: var(--danger);
}

.top-bar.is-warning .status {
    color: var(--warning);
}

.status,
.loaded-files span,
.empty-state {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.status:empty {
    display: none;
}

.status.is-loading::after {
    display: inline-block;
    width: 1.5em;
    content: "";
    animation: loading-dots 1s steps(4, end) infinite;
}

@keyframes loading-dots {
    0% {
        content: "";
    }

    25% {
        content: ".";
    }

    50% {
        content: "..";
    }

    75%,
    100% {
        content: "...";
    }
}

.menu-actions {
    display: flex;
    align-items: center;
    flex: 0 0 auto;
}

.load-menu {
    position: relative;
}

.load-menu > summary {
    display: grid;
    place-items: center;
    width: 32px;
    padding: 0;
    list-style: none;
}

.load-menu > summary::-webkit-details-marker {
    display: none;
}

.load-menu-panel {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    display: grid;
    gap: 6px;
    width: min(292px, calc(100vw - 20px));
    padding: 7px;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius);
    background: rgb(255 255 255 / 98%);
    box-shadow: 0 16px 34px rgb(30 44 58 / 16%);
}

.load-menu[open] > summary {
    background: rgb(255 255 255 / 98%);
}

.load-section {
    display: grid;
    gap: 4px;
    padding: 0 0 6px;
    border-bottom: 1px solid rgb(202 211 219 / 48%);
}

.load-section:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.load-category {
    display: grid;
    gap: 4px;
    padding: 0 0 6px;
    border-bottom: 1px solid rgb(202 211 219 / 48%);
}

.load-category:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.load-category > summary {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    min-height: 28px;
    padding: 0 3px;
    color: var(--text);
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    list-style: none;
}

.load-category > summary::-webkit-details-marker {
    display: none;
}

.load-category > summary::after {
    color: var(--text-muted);
    font-family: "Material Symbols Rounded";
    font-size: 17px;
    font-weight: normal;
    line-height: 1;
    content: "expand_more";
}

.load-category[open] > summary::after {
    content: "expand_less";
}

.load-section h2 {
    margin: 0;
    padding: 0 3px;
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 650;
    line-height: 1.4;
}

.load-menu-panel button {
    justify-content: start;
    width: 100%;
    margin: 3px 0;
    border-color: transparent;
    background: transparent;
    text-align: left;
}

.load-menu-panel button:hover {
    background: rgb(246 247 248 / 98%);
}

.asset-load-row {
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr) auto;
    gap: 5px;
    align-items: center;
    padding-left: 8px;
}

.asset-load-row label {
    overflow: hidden;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 650;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.asset-load-row select {
    width: 100%;
    min-width: 0;
    height: 30px;
    padding: 0 24px 0 8px;
    color: var(--text);
    font-size: 13px;
}

.asset-load-row-note {
    overflow: hidden;
    color: var(--text-muted);
    font-size: 12px;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.asset-load-row select[hidden],
.asset-load-row button[hidden] {
    display: none;
}

.asset-load-actions {
    display: flex;
    gap: 4px;
    align-items: center;
}

.asset-load-actions button {
    width: auto;
    margin: 0;
}

.asset-load-row .icon-button {
    display: grid;
    place-items: center;
    width: 30px;
    min-height: 30px;
    padding: 3px 5px;
    border-color: var(--surface-border);
}

.asset-load-row .icon-button .material-symbols-rounded {
    font-size: 18px;
}

.top-bar input[type="file"] {
    display: none;
}

.utility-actions {
    position: absolute;
    z-index: 3;
    top: var(--chrome-gap);
    right: var(--chrome-gap);
    display: flex;
    gap: 6px;
    align-items: center;
    margin: 6px;
}

.language-select {
    min-width: 96px;
    width: 90px;
}

.info-menu {
    position: relative;
}

.info-menu > summary {
    display: grid;
    place-items: center;
    width: 32px;
    min-height: 30px;
    padding: 0;
    border: 1px solid var(--surface-border);
    border-radius: 6px;
    background: rgb(255 255 255 / 92%);
    color: var(--text);
    cursor: pointer;
    list-style: none;
}

.info-menu > summary::-webkit-details-marker {
    display: none;
}

.info-menu[open] > summary {
    background: rgb(255 255 255 / 98%);
}

.info-menu-panel {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    display: grid;
    gap: 8px;
    width: min(320px, calc(100vw - 20px));
    padding: 12px 14px;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius);
    background: rgb(255 255 255 / 98%);
    box-shadow: 0 16px 34px rgb(30 44 58 / 16%);
}

.info-title {
    margin: 0;
    font-size: 15px;
    font-weight: 700;
}

.info-menu-panel p {
    margin: 0;
    color: var(--text-muted);
    font-size: 12px;
    line-height: 1.5;
}

.info-note {
    color: var(--text) !important;
    font-weight: 600;
}

.info-copyright {
    padding-top: 6px;
    border-top: 1px solid rgb(202 211 219 / 48%);
}

.info-links {
    display: flex;
    gap: 14px;
}

.info-links a {
    color: var(--accent);
    font-size: 13px;
    font-weight: 650;
}

.info-version {
    color: var(--text-muted);
    font-size: 11px;
    font-variant-numeric: tabular-nums;
}

.loaded-files {
    display: flex;
    gap: 6px;
    align-items: center;
    width: auto;
    max-width: min(56vw, 620px);
    min-width: 0;
}

.loaded-file-control {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 28px;
    gap: 3px;
    align-items: center;
    max-width: min(19vw, 220px);
    min-width: 0;
}

.loaded-file-control[hidden] {
    display: none;
}

.loaded-file-control select {
    width: 100%;
    min-width: 0;
    height: 30px;
    padding: 0 24px 0 8px;
    background: rgb(255 255 255 / 92%);
    color: var(--text);
    font-size: 12px;
}

.clear-loaded-file {
    display: grid;
    place-items: center;
    width: 28px;
    min-height: 30px;
    padding: 0;
    color: var(--text);
}

.clear-loaded-file .material-symbols-rounded {
    font-size: 18px;
}

.transport {
    right: var(--chrome-gap);
    bottom: var(--chrome-gap);
    left: var(--chrome-gap);
    display: grid;
    grid-template-columns: 34px minmax(180px, 1fr) auto;
    gap: 10px;
    align-items: center;
    min-height: var(--transport-height);
    padding: 4px 6px;
    border-radius: var(--radius);
    border: 1px solid var(--surface-border);
    background-color: white;
}

.transport[hidden] {
    display: none;
}

#play-toggle {
    display: grid;
    place-items: center;
    width: 34px;
    min-height: 34px;
    padding: 0;
}

.transport label {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 8px;
    align-items: center;
    color: var(--text-muted);
    font-size: 12px;
}

.transport input[type="range"] {
    width: 100%;
    accent-color: var(--accent);
}

.transport sl-range {
    width: 100%;
    --thumb-size: 15px;
    --track-height: 5px;
}

#frame-value {
    min-width: 96px;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

.volume-control {
    display: grid;
    grid-template-columns: auto 90px;
    gap: 6px;
    align-items: center;
}

.volume-control[hidden] {
    display: none;
}

#volume-toggle {
    font-size: 18px;
}

#volume-slider {
    width: 90px;
}

.empty-state,
.drop-target {
    position: absolute;
    right: var(--chrome-gap);
    bottom: calc(var(--chrome-gap) + var(--transport-height) + 12px);
    left: var(--chrome-gap);
    top: calc(var(--chrome-gap) + var(--top-bar-height) + 50px);
    display: none;
    place-content: center;
    gap: 5px;
    text-align: center;
    pointer-events: none;
}

.viewer-shell:not(.has-motion) .empty-state,
.viewer-shell:not(.has-motion) .drop-target {
    bottom: var(--chrome-gap);
}

.empty-state {
    z-index: 1;
    gap: 8px;
    overflow: visible;
    color: var(--text-muted);
    font-size: 13px;
    white-space: normal;
}

.empty-state strong {
    color: var(--text);
    font-size: 15px;
}

.empty-state-icon {
    font-size: 44px !important;
    color: var(--surface-border);
}

.stage.is-empty:not(.is-dragging) .empty-state {
    display: grid;
}

.drop-target {
    z-index: 3;
    border: 1px dashed var(--accent);
    border-radius: var(--radius);
    background: rgb(255 255 255 / 88%);
    color: var(--text);
}

.stage.is-dragging .drop-target {
    display: grid;
}

.drop-target span {
    color: var(--text-muted);
}

.physics-error {
    position: absolute;
    z-index: 2;
    right: var(--chrome-gap);
    bottom: calc(var(--chrome-gap) + var(--transport-height) + 12px);
    left: var(--chrome-gap);
    padding: 8px 10px;
    border: 1px solid rgb(180 35 35 / 35%);
    border-radius: var(--radius);
    background: rgb(255 247 247 / 96%);
    color: var(--danger);
    font-size: 12px;
    line-height: 1.45;
    box-shadow: 0 10px 24px rgb(30 44 58 / 10%);
}

.physics-error[hidden] {
    display: none;
}

.loading-indicator {
    position: absolute;
    z-index: 4;
    top: 50%;
    left: 50%;
    display: inline-grid;
    grid-template-columns: 18px auto;
    gap: 9px;
    align-items: center;
    max-width: min(320px, calc(100vw - 32px));
    padding: 10px 13px;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius);
    background: rgb(255 255 255 / 96%);
    color: var(--text);
    font-size: 13px;
    box-shadow: 0 16px 34px rgb(30 44 58 / 18%);
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.loading-indicator[hidden] {
    display: none;
}

.loading-spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgb(75 85 99 / 20%);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: loading-spin 0.8s linear infinite;
}

#loading-message {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

@keyframes loading-spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 920px) {
    .top-bar {
        align-items: start;
    }

    .empty-state,
    .drop-target {
        top: calc(var(--chrome-gap) + var(--top-bar-height) + 20px);
    }

    .transport {
        grid-template-columns: 88px 1fr;
    }

    .transport label {
        grid-column: 1 / -1;
    }
}

@media (max-width: 540px) {
    :root {
        --chrome-gap: 8px;
    }

    .status {
        display: none;
    }

    .loaded-files {
        max-width: min(62vw, 280px);
    }

    .loaded-file-control {
        max-width: min(30vw, 132px);
    }

    .transport {
        grid-template-columns: 1fr;
    }

    .transport label {
        grid-template-columns: 1fr;
        gap: 5px;
    }

    #frame-value {
        min-width: 0;
        text-align: left;
    }
}