html {
    /* Remove touch delay: */
    touch-action: manipulation;
}

body {
    /* Light mode background color for what is not covered by the egui canvas,
    or where the egui canvas is translucent. */
    background: #909090;
}

@media (prefers-color-scheme: dark) {
    body {
        /* Dark mode background color for what is not covered by the egui canvas,
        or where the egui canvas is translucent. */
        background: #404040;
    }
}

/* Allow canvas to fill entire web page: */
html,
body {
    overflow: hidden;
    margin: 0 !important;
    padding: 0 !important;
    height: 100%;
    width: 100%;
}

/* Make canvas fill entire document: */
canvas {
    margin-right: auto;
    margin-left: auto;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.loading-overlay {
    position: fixed;
    inset: 0;
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    isolation: isolate;
    overflow: hidden;
    padding: 24px;
    background-color: #362f56;
    color: #f0f0f0;
    font-size: 24px;
    font-family: Ubuntu-Light, Helvetica, sans-serif;
    text-align: center;
}

.loading-overlay::before {
    content: "";
    position: absolute;
    z-index: 0;
    inset: -512px;
    background-image: url("assets/zooble_bg.png");
    background-repeat: repeat;
    background-size: 512px 512px;
    pointer-events: none;
    will-change: transform;
    animation: zooble-background-scroll 60s linear infinite;
}

.loading-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.loading-marty {
    display: block;
    width: 128px;
    height: 128px;
    image-rendering: pixelated;
    transform-origin: bottom center;
    filter: drop-shadow(0 5px 8px rgba(0, 0, 0, 0.7));
    animation: marty-loading-bounce 0.8s infinite;
}

.loading-label {
    margin: 12px 0 0;
    color: #e2daf7;
    font-size: 16px;
    text-shadow: 0 2px 4px #000;
}

.initialization-error-logo {
    display: block;
    width: 128px;
    height: 128px;
    margin: 0 auto 12px;
    image-rendering: pixelated;
}

.initialization-error-message {
    margin: 0;
    font-size: 16px;
    line-height: 1.5;
}

.fatal-error-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    padding: 24px;
    background: #404040;
    color: #f0f0f0;
    font-family: Ubuntu-Light, Helvetica, sans-serif;
    text-align: center;
}

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

.fatal-error-content {
    max-width: 480px;
}

.web-footer {
    position: fixed;
    z-index: 2100;
    right: 0;
    bottom: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.45em;
    padding: 6px 10px;
    color: rgba(226, 218, 247, 0.62);
    font: 11px/1 Helvetica, Arial, sans-serif;
    letter-spacing: 0.025em;
    pointer-events: none;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.9);
    user-select: none;
    white-space: nowrap;
}

.web-footer a {
    color: inherit;
    pointer-events: auto;
    text-decoration: none;
}

.web-footer a:hover,
.web-footer a:focus-visible {
    color: #e2daf7;
    outline: none;
    text-decoration: underline;
}

@keyframes marty-loading-bounce {
    0%, 100% {
        transform: translateY(0) scale(1, 1);
    }

    20% {
        transform: translateY(0) scale(0.9, 1.05);
    }

    50% {
        transform: translateY(-2px) scale(1.2, 0.75);
    }

    80% {
        transform: translateY(0) scale(0.98, 1.02);
    }
}

/* Start overlay styling */
.start-overlay {
    --marty-dark-purple: #362f56;
    --carousel-accent: #b9a6e8;
    --carousel-accent-bright: #e2daf7;
    --carousel-accent-rgb: 185, 166, 232;
    --carousel-shadow: rgba(0, 0, 0, 0.78);
    --egui-selection: #005c80;
    --egui-selection-dark: #004864;
    --egui-selection-stroke: #c0deff;
    --egui-selection-shadow: #00384e;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    isolation: isolate;
    overflow-x: hidden;
    overflow-y: auto;
    background-color: var(--marty-dark-purple);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 24px 12px;
    z-index: 1000;
}

.start-overlay::before {
    content: "";
    position: fixed;
    z-index: 0;
    inset: -512px;
    background-image: url("assets/zooble_bg.png");
    background-repeat: repeat;
    background-size: 512px 512px;
    pointer-events: none;
    will-change: transform;
    animation: zooble-background-scroll 60s linear infinite;
}

/* Infinite diagonal bg scroll */
@keyframes zooble-background-scroll {
    from {
        transform: translate3d(0, 0, 0);
    }

    to {
        transform: translate3d(512px, 512px, 0);
    }
}

.start-launcher {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: min(760px, 96vw);
    color: #f2eee5;
    font-family: Ubuntu-Light, Helvetica, Arial, sans-serif;
    text-align: center;
    user-select: none;
}

.start-title {
    margin: 12px 0 0;
    color: var(--carousel-accent-bright);
    font-size: clamp(15px, 2.4vw, 20px);
    font-weight: 700;
    letter-spacing: 0.18em;
    line-height: 1.2;
    text-shadow: 0 2px 4px #000;
    text-transform: uppercase;
}

.start-logo-wrapper {
    display: inline-block;
    transform-origin: bottom center;
}

.start-brand-logo {
    display: block;
    width: clamp(280px, 55vw, 520px);
    height: auto;
    filter: drop-shadow(0 5px 8px rgba(0, 0, 0, 0.7));
}

.system-carousel {
    display: grid;
    grid-template-columns: clamp(40px, 8vw, 62px) minmax(0, 1fr) clamp(40px, 8vw, 62px);
    align-items: center;
    width: 100%;
    margin-top: 2px;
}

.carousel-stage {
    position: relative;
    height: clamp(190px, 32vh, 250px);
    min-width: 0;
    outline: none;
    perspective: 700px;
    touch-action: pan-y;
}

.carousel-stage::after {
    content: "";
    position: absolute;
    z-index: 0;
    left: 50%;
    bottom: 9%;
    width: min(88%, 490px);
    height: 64%;
    border: 2px solid rgba(var(--carousel-accent-rgb), 0.4);
    border-radius: 50%;
    background: rgba(var(--carousel-accent-rgb));
    box-shadow: 0 18px 28px rgba(0, 0, 0, 0.42);
    pointer-events: none;
    transform: translateX(-50%);
}

.system-card {
    --carousel-card-offset: 84px;
    --carousel-left: 50%;
    --carousel-top: 45%;
    --carousel-scale: 0.5;
    --carousel-rotation: 0deg;
    --carousel-brightness: 0.28;
    --carousel-saturation: 0.42;
    --carousel-opacity: 0.45;
    --carousel-z: 1;
    position: absolute;
    z-index: var(--carousel-z);
    top: calc(var(--carousel-top) - var(--carousel-card-offset));
    left: calc(var(--carousel-left) - var(--carousel-card-offset));
    display: grid;
    place-items: center;
    width: 168px;
    height: 168px;
    padding: 0;
    border: 0;
    outline: none;
    background: transparent;
    cursor: pointer;
    opacity: var(--carousel-opacity);
    filter: brightness(var(--carousel-brightness)) contrast(1.08) saturate(var(--carousel-saturation));
    transform: scale(var(--carousel-scale)) rotateY(var(--carousel-rotation));
}

.system-card img {
    display: block;
    width: 128px;
    height: 128px;
    image-rendering: pixelated;
    pointer-events: none;
    -webkit-user-drag: none;
    filter: drop-shadow(0 10px 8px var(--carousel-shadow));
}

.system-card[data-position="active"] {
    transform: none;
}

.system-card:focus-visible img {
    filter: drop-shadow(0 0 3px var(--carousel-accent-bright)) drop-shadow(0 10px 8px var(--carousel-shadow));
}

.carousel-chevron {
    position: relative;
    z-index: 5;
    width: clamp(38px, 7vw, 54px);
    height: clamp(48px, 9vw, 70px);
    padding: 0;
    border: 1px solid rgba(var(--carousel-accent-rgb), 0.3);
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.18);
    cursor: pointer;
    transition: background-color 120ms ease, border-color 120ms ease, transform 120ms ease;
}

.carousel-chevron::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 14px;
    height: 14px;
    border-bottom: 3px solid var(--carousel-accent);
    border-left: 3px solid var(--carousel-accent);
}

.carousel-chevron.previous::before {
    transform: translate(-35%, -50%) rotate(45deg);
}

.carousel-chevron.next::before {
    transform: translate(-65%, -50%) rotate(225deg);
}

.carousel-chevron:hover,
.carousel-chevron:focus-visible {
    border-color: var(--carousel-accent);
    outline: none;
    background: rgba(var(--carousel-accent-rgb), 0.12);
}

.carousel-chevron:active {
    transform: scale(0.94);
}

.system-details-panel {
    width: 100%;
    opacity: 1;
    transition: opacity 200ms ease-out;
    will-change: opacity;
}

.system-details-panel.is-changing {
    opacity: 0;
    pointer-events: none;
    transition-duration: 160ms;
    transition-timing-function: ease-in;
}

.system-details {
    min-height: 54px;
    margin-top: 14px;
    text-shadow: 0 2px 4px #000;
}

.system-name {
    margin: 0;
    color: #fff8e8;
    font-size: clamp(22px, 4.6vw, 32px);
    font-weight: 700;
    line-height: 1.15;
}

.system-description {
    margin: 5px 0 0;
    color: #aaa8ad;
    font-size: clamp(12px, 2.8vw, 15px);
    letter-spacing: 0.08em;
}

.system-options {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 76px;
    margin-top: 10px;
    gap: 8px;
}

.system-options[data-visible="false"] {
    visibility: hidden;
    pointer-events: none;
}

.system-option {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.system-option[data-visible="false"] {
    display: none;
}

.system-options-label {
    color: var(--carousel-accent-bright);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.system-options-select {
    min-width: 140px;
    padding: 6px 30px 6px 10px;
    border: 1px solid rgba(var(--carousel-accent-rgb), 0.65);
    border-radius: 4px;
    outline: none;
    background: #29233f;
    color: #fff8e8;
    color-scheme: dark;
    cursor: pointer;
    font: 700 14px Ubuntu-Light, Helvetica, Arial, sans-serif;
}

.system-options-select:hover,
.system-options-select:focus-visible {
    border-color: var(--carousel-accent-bright);
    box-shadow: 0 0 0 2px rgba(var(--carousel-accent-rgb), 0.2);
}

.system-options-checkbox {
    cursor: pointer;
}

.system-options-checkbox input {
    width: 17px;
    height: 17px;
    margin: 0;
    accent-color: var(--egui-selection);
    cursor: pointer;
}

.start-button {
    min-width: min(280px, 82vw);
    margin-top: 16px;
    padding: 12px 24px;
    border: 1px solid var(--egui-selection-stroke);
    border-radius: 5px;
    background: linear-gradient(
            to bottom,
            var(--egui-selection),
            var(--egui-selection-dark)
    );
    box-shadow: 0 4px 0 var(--egui-selection-shadow), 0 8px 16px rgba(0, 0, 0, 0.45);
    color: #fff;
    cursor: pointer;
    font: 700 clamp(15px, 3.2vw, 18px) Ubuntu-Light, Helvetica, Arial, sans-serif;
    letter-spacing: 0.04em;
    text-shadow: 0 2px 2px rgba(0, 0, 0, 0.65);
    transition: filter 120ms ease, transform 120ms ease, box-shadow 120ms ease;
}

.start-button:hover,
.start-button:focus-visible {
    outline: 2px solid var(--egui-selection-stroke);
    outline-offset: 3px;
    filter: brightness(1.15);
}

.start-button:active {
    box-shadow: 0 2px 0 var(--egui-selection-shadow), 0 5px 10px rgba(0, 0, 0, 0.4);
    transform: translateY(2px);
}

.carousel-instructions {
    margin: 14px 0 0;
    color: #7f7e84;
    font-size: 12px;
    letter-spacing: 0.06em;
}

.swipe-instruction {
    display: none;
}

.touch-device .arrow-instruction {
    display: none;
}

.touch-device .swipe-instruction {
    display: inline;
}

@media (max-height: 560px) {
    .start-overlay {
        align-items: flex-start;
        padding-top: 10px;
    }

    .start-brand-logo {
        width: 300px;
    }

    .start-title {
        margin-top: 4px;
    }

    .carousel-stage {
        height: 160px;
    }

    .system-card {
        --carousel-card-offset: 69px;
        width: 138px;
        height: 138px;
    }

    .system-details {
        min-height: 44px;
    }

    .start-button {
        margin-top: 8px;
        padding: 9px 20px;
    }

    .carousel-instructions {
        margin-top: 8px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .start-overlay::before,
    .loading-overlay::before,
    .loading-marty {
        animation: none;
    }

    .system-card,
    .carousel-chevron,
    .system-details-panel,
    .start-button {
        animation: none !important;
        transition: none;
    }
}