:root {
    --bg-color: rgba(0, 0, 0, 0.8);
    --overlay-bg-color: rgba(0, 0, 0, 0.7);
    --text-color: #fff;
    --accent-color: #555;
    --panel-padding: 24px;
    --spacing: 20px;
}

body {
    margin: 0;
    overflow: hidden;
}

.visuallyHidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    clip-path: inset(50%);
    border: 0;
    white-space: nowrap;
}

main {
    width: 100vw;
    height: 100vh;
    display: block;
}

/* Slide-out sidebar used for simulation settings */
#sidebar {
    position: fixed;
    z-index: 500;
    top: 0;
    right: -320px;
    width: 320px;
    height: 100%;
    background: var(--bg-color);
    color: var(--text-color);
    padding: var(--panel-padding);
    box-sizing: border-box;
    overflow-y: auto;
    transition: right 0.3s ease;
    font-family: sans-serif;
}

#sidebar.open {
    right: 0;
}
#primaryControls {
    position: fixed;
    top: var(--spacing);
    left: var(--spacing);
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-family: sans-serif;
    z-index: 1000;
}

#primaryControls .controlPanel {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--overlay-bg-color);
    color: var(--text-color);
    padding: 4px 8px;
}

#primaryControls .datasetControl {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
}

#targetControl {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
}

#targetControl label {
    align-self: flex-start;
}

#cameraVelocity {
    display: none;
    background: rgba(0, 0, 0, 0.35);
    color: var(--text-color);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 6px;
    padding: 6px 8px;
    margin-top: 4px;
    font-family: sans-serif;
    font-size: 12px;
    line-height: 1.4;
    white-space: pre-line;
}

#cameraVelocity[data-visible="true"] {
    display: block;
}

#floatingControls {
    position: fixed;
    bottom: var(--spacing);
    right: var(--spacing);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 1000;
}

#floatingControls button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--overlay-bg-color);
    color: var(--text-color);
    border: none;
    border-radius: 50%;
    padding: 0;
    font-family: sans-serif;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, opacity 0.18s ease;
}

#floatingControls button:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 2px;
}

#floatingControls button span[aria-hidden="true"] {
    pointer-events: none;
}

#toggleSidebar {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

#toggleSidebar:hover,
#toggleSidebar:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
}

#xrSpectatorToggle {
    box-shadow: 0 4px 16px rgba(64, 148, 255, 0.4);
}

#xrSpectatorToggle.is-active {
    background: linear-gradient(135deg, rgba(72, 255, 189, 0.95), rgba(22, 168, 129, 0.9));
    box-shadow: 0 6px 20px rgba(72, 255, 189, 0.55);
}

#xrSpectatorToggle.is-busy {
    background: linear-gradient(135deg, rgba(160, 160, 160, 0.95), rgba(110, 110, 110, 0.9));
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
    cursor: progress;
}

#xrSpectatorToggle.is-unavailable,
#xrSpectatorToggle:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.xrStatusMessage {
    font-size: 13px;
    line-height: 1.4;
    margin: 0;
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
}

.xrStatusMessage[hidden] {
    display: none;
}

.datasetSelector {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 220px;
}

.datasetSelector input[type="search"] {
    background: rgba(0, 0, 0, 0.4);
    color: var(--text-color);
    border: 1px solid var(--accent-color);
    border-radius: 4px;
    padding: 4px 8px;
    font-size: 14px;
}

.datasetSelector input[type="search"]:focus-visible {
    outline: 2px solid var(--text-color);
    outline-offset: 2px;
}

.datasetSelector input[type="search"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.datasetSelector.is-disabled {
    opacity: 0.75;
}

.datasetResults {
    position: relative;
    min-height: 48px;
    max-height: 240px;
    overflow-y: auto;
    border: 1px solid var(--accent-color);
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.5);
    padding: 0;
}

.datasetResults:focus-visible {
    outline: 2px solid var(--text-color);
    outline-offset: 2px;
}

.datasetOption {
    display: block;
    width: 100%;
    border: none;
    background: transparent;
    color: var(--text-color);
    text-align: left;
    padding: 8px 10px;
    cursor: pointer;
    font-size: 14px;
}

.datasetOptionLabel {
    font-weight: 600;
}

.datasetOptionDescription {
    font-size: 12px;
    opacity: 0.75;
    margin-top: 2px;
}

.datasetOption.is-highlighted,
.datasetOption:focus-visible {
    outline: none;
    background: rgba(255, 255, 255, 0.12);
}

.datasetOption[aria-selected='true'] .datasetOptionLabel {
    text-decoration: underline;
}

.datasetStatus {
    font-size: 12px;
    color: var(--text-color);
    min-height: 16px;
    opacity: 0.85;
}

#datasetControl label, #targetControl label {
    font-size: 14px;
}

#simulationDatetimeControl {
    position: fixed;
    top: var(--spacing);
    right: var(--spacing);
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    background: var(--overlay-bg-color);
    color: var(--text-color);
    padding: 6px 12px;
    font-family: sans-serif;
    z-index: 200;
}

#simulationDatetimeControl label {
    font-size: 14px;
    text-align: right;
}

.simulationDatetimeRow {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 8px;
}

#simulationDatetimeControl .timeScaleRow {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    flex-wrap: wrap;
}

#simulationDatetimeControl .jdRow {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    flex-wrap: wrap;
}

#simulationDatetimeControl input[type="datetime-local"] {
    background: rgba(0, 0, 0, 0.4);
    color: var(--text-color);
    border: 1px solid var(--accent-color);
    padding: 4px 6px;
    border-radius: 4px;
}

#simulationDatetimeControl select {
    background: rgba(0, 0, 0, 0.4);
    color: var(--text-color);
    border: 1px solid var(--accent-color);
    padding: 4px 6px;
    border-radius: 4px;
    min-width: 160px;
}

#simulationDatetimeControl select:focus-visible {
    outline: 2px solid var(--text-color);
    outline-offset: 2px;
}

#simulationDatetimeControl select:disabled {
    opacity: 0.6;
}

#simulationDatetimeControl input[type="datetime-local"]:focus-visible {
    outline: 2px solid var(--text-color);
    outline-offset: 2px;
}

#simulationDatetimeControl input[type="datetime-local"]:disabled {
    opacity: 0.6;
}

#julianDate {
    pointer-events: none;
    display: none;
    white-space: nowrap;
    font-size: 14px;
}

#targetControl select {
    min-width: 160px;
    width: 100%;
}

#primaryControls select {
    background: rgba(0, 0, 0, 0.4);
    color: var(--text-color);
    border: 1px solid var(--accent-color);
    padding: 4px 6px;
    border-radius: 4px;
    font-size: 14px;
}

#primaryControls select:focus-visible {
    outline: 2px solid var(--text-color);
    outline-offset: 2px;
}

#primaryControls select:disabled {
    opacity: 0.6;
}

#targetControl option[hidden] {
    display: none;
}

#sidebar label {
    display: block;
    margin-top: 16px;
}

#sidebar input[type="range"] {
    width: 100%;
}

#sidebar .lowPowerControl.is-disabled {
    opacity: 0.55;
}

#sidebar .lowPowerControl.is-disabled input[type="checkbox"] {
    cursor: not-allowed;
}

#sidebar .section h3 {
    margin: var(--spacing) 0 12px;
    font-size: 16px;
    border-bottom: 1px solid var(--accent-color);
}

#loadingOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--overlay-bg-color);
    color: var(--text-color);
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    z-index: 2000;
}

#textureStatusOverlay {
    position: fixed;
    bottom: var(--spacing);
    right: var(--spacing);
    background: var(--overlay-bg-color);
    color: var(--text-color);
    padding: 12px 18px;
    font-family: sans-serif;
    font-size: 18px;
    border-radius: 8px;
    display: none;
    align-items: center;
    justify-content: center;
    gap: 8px;
    z-index: 1900;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    pointer-events: none;
    min-width: 220px;
    text-align: center;
}

/* Information panel shown when a body is targeted */
#systemOverviewWindow {
    position: fixed;
    bottom: var(--spacing);
    left: var(--spacing);
    background: var(--overlay-bg-color);
    color: var(--text-color);
    padding: 12px 16px;
    font-family: sans-serif;
    font-size: 14px;
    line-height: 1.5;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    max-width: 360px;
    max-height: 50vh;
    overflow-y: auto;
    display: none;
    z-index: 980;
}

#systemOverviewWindow.isCollapsed {
    overflow: visible;
}

#systemOverviewWindow .systemOverviewHeader {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 8px;
}

#systemOverviewWindow.isCollapsed .systemOverviewHeader {
    margin-bottom: 0;
}

#systemOverviewWindow .systemOverviewHeader h2 {
    flex: 1;
}

#systemOverviewWindow .systemOverviewToggle {
    margin-left: auto;
    background: none;
    border: none;
    color: inherit;
    font: inherit;
    cursor: pointer;
    padding: 2px 10px;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 28px;
}

#systemOverviewWindow:not(.isCollapsed) .systemOverviewToggle {
    width: 32px;
    height: 32px;
    padding: 0;
    font-size: 20px;
}

#systemOverviewWindow .systemOverviewToggle:hover,
#systemOverviewWindow .systemOverviewToggle:focus-visible {
    background-color: rgba(255, 255, 255, 0.12);
}

#systemOverviewWindow .systemOverviewToggle:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

#systemOverviewWindow.isCollapsed .systemOverviewContent {
    display: none;
}

#systemOverviewWindow h2 {
    margin: 0;
    font-size: 16px;
}

#systemOverviewWindow p {
    margin: 0 0 8px;
}

#systemOverviewWindow p:last-child {
    margin-bottom: 0;
}

#systemOverviewWindow .systemOverviewSummary {
    font-weight: 600;
}

#infoWindow {
    display: none;
    width: -webkit-fill-available;
    background: rgba(0, 0, 0, 0.35);
    color: var(--text-color);
    border: 1px solid var(--accent-color);
    border-radius: 6px;
    padding: 8px 10px;
    font-family: sans-serif;
    line-height: 1.4;
}

#infoWindow .targetInfoName {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 6px;
}

#infoWindow .targetInfoDetails {
    margin: 0;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 4px 12px;
    font-size: 12px;
}

#infoWindow .targetInfoDetails dt {
    font-weight: 600;
}

#infoWindow .targetInfoDetails dd {
    margin: 0;
}