/* OSD/OS Setup, in the look of OSD/OS's own menus: Video 1's blue and white,
   the deck's letters (VCR OSD Mono), a title bar, headings with a rule to the
   line's end, and lines of label, dots and value. */
@font-face {
    font-family: "VCR OSD Mono";
    src: url("fonts/VCR_OSD_MONO_1.001.ttf") format("truetype");
    font-display: swap;
}

:root {
    --surface: #0110C5;
    --primary: #FFFFFF;
    --secondary: #C2BFE4;
    --tertiary: #8480C9;
    --accent: #AECFFF;
    --warn: #FFD900;
    --error: #FF8A80;
    --px: 2px;
    color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    background: var(--surface);
    color: var(--primary);
    font-family: "VCR OSD Mono", ui-monospace, "DejaVu Sans Mono", monospace;
    font-size: 18px;
    line-height: 1.35;
}

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

main {
    max-width: 880px;
    margin: 0 auto;
    padding: 32px 16px 64px;
}

/* --- The title bar: the cassette, then the title, as AppBar draws it. --- */
.appbar {
    display: flex;
    align-items: stretch;
    gap: 6px;
    min-height: 44px;
    margin-bottom: 20px;
}
.appbar .icon {
    width: 64px;
    background: var(--primary);
    display: grid;
    place-items: center;
}
.appbar .icon span {
    width: 44px;
    height: 24px;
    background: var(--surface);
    -webkit-mask: url("img/logo.svg") center / contain no-repeat;
    mask: url("img/logo.svg") center / contain no-repeat;
}
.appbar h1 {
    flex: 1;
    margin: 0;
    background: var(--primary);
    color: var(--surface);
    font-size: 26px;
    font-weight: normal;
    padding: 0 12px;
    display: flex;
    align-items: center;
    gap: 14px;
    letter-spacing: 1px;
}
.appbar h1 small {
    font-size: 15px;
    border-left: var(--px) solid var(--surface);
    padding-left: 12px;
}
/* Back to the website, and to the repository, at the bar's end. */
.appbar .home,
.appbar .repo {
    display: flex;
    align-items: center;
    padding: 0 12px;
    background: var(--primary);
    color: var(--surface);
    font-size: 15px;
    letter-spacing: 1px;
    text-decoration: none;
    white-space: nowrap;
}
.appbar .home:hover,
.appbar .repo:hover { text-decoration: underline; }
@media (max-width: 480px) {
    .appbar h1 { font-size: 20px; }
    .appbar h1 small { display: none; }
    .appbar .home span { display: none; }
    /* The repository's link stays in the text below the bar. */
    .appbar .repo { display: none; }
}

/* --- The opening: what the page does in a line, the three steps with their
   pixel icons, then the details. --- */
.icon-defs { position: absolute; width: 0; height: 0; overflow: hidden; }
.pixel-icon { fill: currentColor; shape-rendering: crispEdges; }
.intro p { margin: 0 0 10px; }
.intro .lead { font-size: 20px; margin-bottom: 16px; }
.howto {
    list-style: none;
    margin: 0 0 18px;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}
.howto li {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 12px;
    border: var(--px) solid var(--primary);
}
.howto .pixel-icon { flex: none; width: 32px; height: 32px; }
.howto .step { display: block; margin-bottom: 4px; text-transform: uppercase; letter-spacing: 1px; }
.howto .what { display: block; font-size: 15px; line-height: 1.35; color: var(--secondary); }
.note { color: var(--secondary); }

/* --- The import and export bar. --- */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0 26px;
}
button, .button {
    font: inherit;
    font-size: 16px;
    color: var(--surface);
    background: var(--primary);
    border: 0;
    padding: 6px 12px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
}
button.secondary {
    color: var(--primary);
    background: transparent;
    border: var(--px) solid var(--primary);
}
button:hover { background: var(--accent); color: var(--surface); }
button:disabled { opacity: 0.5; cursor: default; }

/* --- A section: a heading with a rule to the line's end. --- */
section { margin: 0 0 30px; }
section > h2, details > summary {
    font-size: 22px;
    font-weight: normal;
    margin: 0 0 8px;
    display: flex;
    align-items: center;
    gap: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
section > h2::after, details > summary::after {
    content: "";
    flex: 1;
    border-bottom: var(--px) solid var(--primary);
}
details > summary {
    cursor: pointer;
    list-style: none;
    font-size: 19px;
    margin-top: 14px;
}
details > summary::-webkit-details-marker { display: none; }
details > summary::before { content: "►"; font-size: 13px; }
details[open] > summary::before { content: "▼"; }
.section-help { color: var(--secondary); margin: 0 0 10px; font-size: 16px; }

/* --- A line: the label, dots, then the value against the line's end. --- */
.row {
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 36px;
    padding: 2px 6px;
}
.row > label, .row > .label {
    text-transform: uppercase;
    white-space: nowrap;
}
.row > .dots {
    flex: 1;
    min-width: 16px;
    align-self: center;
    border-bottom: var(--px) dotted var(--primary);
    transform: translateY(4px);
}
.row:focus-within {
    background: var(--primary);
    color: var(--surface);
}
.row:focus-within .dots { border-color: var(--surface); }
.row.changed > label::before, .row.changed > .label::before {
    content: "• ";
    color: var(--accent);
}
.row:focus-within.changed > label::before { color: var(--surface); }
.row .reset {
    flex: none;
    width: 30px;
    font-size: 13px;
    padding: 2px 0;
    visibility: hidden;
}
.row.changed .reset { visibility: visible; }

.help {
    color: var(--secondary);
    font-size: 15px;
    margin: -2px 6px 8px;
}
.help.warn { color: var(--warn); }
.help.error, .error { color: var(--error); }

input[type="text"], input[type="password"], select, textarea {
    font: inherit;
    font-size: 16px;
    color: var(--surface);
    background: var(--primary);
    border: var(--px) solid var(--primary);
    padding: 4px 8px;
    max-width: 100%;
}
.row input[type="text"], .row input[type="password"] { width: 300px; }
.row select { max-width: 360px; }
.row:focus-within input, .row:focus-within select {
    border-color: var(--surface);
}
textarea {
    width: 100%;
    min-height: 70px;
    resize: vertical;
}
input[type="checkbox"] {
    appearance: none;
    width: 24px;
    height: 24px;
    margin: 0;
    border: var(--px) solid currentColor;
    background: transparent;
    display: grid;
    place-items: center;
    cursor: pointer;
}
input[type="checkbox"]:checked::after {
    content: "";
    width: 12px;
    height: 12px;
    background: currentColor;
}
.toggle { display: inline-flex; align-items: center; gap: 8px; }
.row .state {
    min-width: 34px;
    text-align: right;
}

/* A password with its show / hide button. */
.secret {
    display: flex;
    gap: 6px;
    align-items: center;
}
.secret button {
    font-size: 13px;
    padding: 4px 8px;
    min-width: 58px;
}

.status {
    min-height: 1.4em;
    margin: -12px 0 18px;
}
.status.ok { color: var(--accent); }

/* --- On the card: the steps, and the card as it ends up, in letters. --- */
.finish {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 6px 32px;
    align-items: start;
}
.steps { padding-left: 22px; }
.steps li { margin-bottom: 6px; }
.card-art {
    margin: 2px 0 0;
    font-size: 15px;
    line-height: 1.2;
    color: var(--primary);
    overflow: hidden;
}
code {
    font-family: inherit;
    color: var(--accent);
}

footer {
    margin-top: 40px;
    color: var(--secondary);
    font-size: 14px;
}

@media (max-width: 640px) {
    html, body { font-size: 16px; }
    .intro .lead { font-size: 18px; }
    .howto, .finish, .kinds { grid-template-columns: 1fr; }
    .card-art { font-size: 14px; }
    .row { flex-wrap: wrap; }
    .row > .dots { display: none; }
    .row > label, .row > .label { flex: 1; white-space: normal; }
    /* A line with a field: its label above, the field and ↺ across the line under it. */
    .row:has(input[type="text"], input[type="password"], select, input[type="range"], .multi) > label { flex-basis: 100%; }
    .row input[type="text"], .row input[type="password"], .row select { flex: 1; width: auto; min-width: 0; max-width: none; }
    .row .secret, .row .slider, .row .multi { flex: 1; min-width: 0; }
    .secret input { flex: 1; }
    .slider input[type="range"] { flex: 1; width: auto; }
    .multi { justify-content: flex-start; }
}

/* --- The parts the form is made of. --- */
.line { margin: 0 0 2px; }
.line > .label { display: block; padding: 2px 6px; text-transform: uppercase; }
h3.subheading {
    font-size: 17px;
    font-weight: normal;
    color: var(--accent);
    margin: 14px 6px 6px;
    text-transform: uppercase;
}
h3.group {
    font-size: 19px;
    font-weight: normal;
    margin: 26px 0 0;
    text-transform: uppercase;
    color: var(--secondary);
}
details { margin-bottom: 6px; }
details > *:not(summary) { margin-left: 18px; }
.slider { display: inline-flex; align-items: center; gap: 8px; }
.slider input[type="range"] { width: 180px; accent-color: var(--accent); }
.multi { display: inline-flex; flex-wrap: wrap; gap: 6px 14px; justify-content: flex-end; }
.pick { display: inline-flex; align-items: center; gap: 4px; text-transform: uppercase; font-size: 15px; }
.account { margin-top: 8px; }

/* --- The device: two choices, the one chosen inverted, as a menu's line. --- */
.kinds {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}
.kind {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 10px 12px;
    border: var(--px) solid var(--primary);
    cursor: pointer;
}
.kind input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}
.kind.chosen {
    background: var(--primary);
    color: var(--surface);
}
.kind:focus-within {
    outline: var(--px) solid var(--accent);
    outline-offset: 2px;
}
.kind-name { font-size: 20px; text-transform: uppercase; letter-spacing: 1px; }
.kind-about { font-size: 15px; }
.kind:not(.chosen) .kind-about { color: var(--secondary); }

/* --- The live preview: the app's screens, its pixels kept square. --- */
.preview { margin: 0 0 18px; }
.preview .tabs { display: flex; gap: 8px; margin-bottom: 8px; }
.preview .tab {
    color: var(--primary);
    background: transparent;
    border: var(--px) solid var(--primary);
}
.preview .tab.chosen {
    color: var(--surface);
    background: var(--primary);
}
.preview canvas {
    display: block;
    box-sizing: content-box;
    width: 640px;
    max-width: calc(100% - 2 * var(--px));
    height: auto;
    aspect-ratio: 4 / 3;
    image-rendering: pixelated;
    border: var(--px) solid var(--primary);
}
.preview canvas:focus-visible { outline: var(--px) solid var(--accent); outline-offset: 2px; }
.preview figcaption { color: var(--secondary); font-size: 15px; margin-top: 6px; }
/* A screen with room for both: the form and the preview side by side, the
   preview kept in sight as the rows are changed. */
@media (min-width: 1600px) and (min-height: 720px) {
    main { margin-left: max(0px, calc((100vw - 1572px) / 2)); }
    .preview {
        position: fixed;
        top: 32px;
        left: calc(max(0px, (100vw - 1572px) / 2) + 16px + 848px + 48px);
        width: calc(640px + 2 * var(--px));
        margin: 0;
    }
}
.slider .end { font-size: 12px; }