// theme variables; dark is the default (also covers the instant before JS sets
// the data-theme attribute), light is the same landing palette inverted.
// Every page shares --page-bg: the scene canvases are transparent, so the
// landing gradient is the scenery background, 1:1.
:root {
    --page-bg: radial-gradient(ellipse at 50% 30%, #52220a 0%, #140801 60%, #000 100%);
    --ink: #f5e9de;
    --ink-soft: rgba(245, 233, 222, 0.7);
    --ink-faint: rgba(245, 233, 222, 0.55);
    --panel-bg: rgba(18, 7, 1, 0.6);
    --panel-border: rgba(244, 79, 4, 0.35);
}

html[data-theme='light'] {
    --page-bg: radial-gradient(ellipse at 50% 30%, #fff8f0 0%, #fdca9e 55%, #ef9d55 100%);
    --ink: #1b0a02;
    --ink-soft: rgba(27, 10, 2, 0.7);
    --ink-faint: rgba(27, 10, 2, 0.5);
    --panel-bg: rgba(255, 248, 240, 0.6);
    --panel-border: rgba(244, 79, 4, 0.4);
}

html,
body {
    min-height: 100vh;
}

body {
    margin: 0;
    background: var(--page-bg);
    font-family: Georgia, 'Times New Roman', serif;
    color: var(--ink);
}

// the scenes cast their projection onto the wall, so the glow of the gradient
// follows it: lib/glow.js projects the wall centre into screen space every
// frame and drives --glow-x/--glow-y; the landing keeps it centred
html:not([data-theme='light']) body:not(.landing) {
    background: radial-gradient(ellipse 75% 90% at var(--glow-x, 12%) var(--glow-y, 50%), #5c2609 0%, #140801 65%, #000 100%);
}

html[data-theme='light'] body:not(.landing) {
    background: radial-gradient(ellipse 75% 90% at var(--glow-x, 12%) var(--glow-y, 50%), #fff8f0 0%, #fdca9e 60%, #ef9d55 100%);
}

canvas {
    display: block;
}

// page transitions: while the shapes fly out, the page content fades
// (html.leaving, set by chrome.js), the browser crossfades the documents
// (Chromium), and the next page's content fades back in. The gradient
// background never fades, so pages blend through it instead of through black.
@view-transition {
    navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
    animation-duration: 0.45s;
}

canvas,
.page-nav,
.lil-gui,
.theme-toggle,
.landing-content {
    animation: page-enter 0.6s ease;
    transition: opacity 0.45s ease;
}

html.leaving :is(canvas, .page-nav, .lil-gui, .theme-toggle, .landing-content) {
    opacity: 0;
}

@keyframes page-enter {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.theme-toggle {
    width: 48px;
    height: 48px;
    border: 1px solid var(--panel-border);
    border-radius: 50%;
    background: var(--panel-bg);
    backdrop-filter: blur(10px);
    color: var(--ink);
    font-size: 22px;
    line-height: 1;
    cursor: pointer;

    &:hover {
        border-color: #f44f04;
    }
}

// floating variant (landing page): top right
body > .theme-toggle {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 20;
}

// top bar on the exploration pages: back link, page title, theme toggle
.page-nav {
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 10;
    display: flex;
    gap: 16px;
    align-items: center;
    font-family: Georgia, 'Times New Roman', serif;

    a {
        color: var(--ink);
        background: var(--panel-bg);
        backdrop-filter: blur(10px);
        border: 1px solid var(--panel-border);
        text-decoration: none;
        padding: 14px 26px;
        border-radius: 999px;
        font-size: 18px;

        &:hover {
            border-color: #f44f04;
        }
    }

    span {
        color: var(--ink-soft);
        font-size: 17px;
        letter-spacing: 0.04em;
    }
}

// ---------- control panel (lil-gui reskin) ---------- //

.lil-gui {
    --background-color: var(--panel-bg);
    --text-color: var(--ink);
    --title-background-color: transparent;
    --title-text-color: #f44f04;
    --widget-color: rgba(244, 79, 4, 0.18);
    --hover-color: rgba(244, 79, 4, 0.3);
    --focus-color: rgba(244, 79, 4, 0.45);
    --number-color: #ff9a5c;
    --string-color: #ff9a5c;
    --font-family: Georgia, 'Times New Roman', serif;
    --font-size: 17px;
    --input-font-size: 17px;
    --title-height: 44px;
    --widget-height: 34px;
    --spacing: 10px;
    --padding: 14px;
    --folder-indent: 14px;
    --widget-border-radius: 8px;

    &.root {
        margin: 16px;
        width: 370px;
        border: 1px solid var(--panel-border);
        border-radius: 12px;
        overflow: hidden;
        backdrop-filter: blur(10px);
    }

    &.root > .title {
        letter-spacing: 0.08em;
    }
}

html[data-theme='light'] .lil-gui {
    --number-color: #c2410c;
    --string-color: #c2410c;
}

@media (max-width: 600px) {
    .lil-gui.root {
        width: calc(100vw - 24px);
        max-height: 45vh;
        overflow-y: auto;
    }

    .page-nav {
        gap: 8px;

        a,
        span {
            font-size: 15px;
        }

        a {
            padding: 10px 16px;
        }
    }
}

// ---------- landing ---------- //

body.landing {
    --card-bg: rgba(18, 7, 1, 0.5);
    --card-bg-hover: rgba(42, 18, 4, 0.75);
}

html[data-theme='light'] body.landing {
    --card-bg: rgba(255, 255, 255, 0.45);
    --card-bg-hover: rgba(255, 255, 255, 0.8);
}

.landing-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.landing-content {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 10vh 24px 12vh;

    header {
        text-align: center;
        margin-bottom: 64px;

        h1 {
            font-size: 64px;
            font-weight: normal;
            letter-spacing: 0.12em;
            margin: 0;
            color: #f44f04;
        }

        p {
            margin: 12px 0 0;
            font-size: 18px;
            letter-spacing: 0.06em;
            color: var(--ink-soft);
        }
    }
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.card {
    display: block;
    padding: 24px;
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    color: inherit;
    text-decoration: none;
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;

    &:hover {
        transform: translateY(-4px);
        border-color: #f44f04;
        background: var(--card-bg-hover);
    }

    h2 {
        margin: 0 0 10px;
        font-size: 22px;
        font-weight: normal;
        color: #f44f04;
    }

    p {
        margin: 0;
        font-size: 14px;
        line-height: 1.55;
        color: var(--ink-soft);
    }
}

.soon {
    width: fit-content;
    margin: 72px auto 0;
    padding: 28px 40px;
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    text-align: center;

    h3 {
        font-weight: normal;
        font-size: 15px;
        letter-spacing: 0.2em;
        text-transform: uppercase;
        color: var(--ink-faint);
        margin: 0 0 16px;
    }

    ul {
        list-style: none;
        margin: 0;
        padding: 0;

        li {
            font-size: 14px;
            color: var(--ink-soft);
            margin: 6px 0;
        }
    }
}