/*
 * Shared design system for siwill22.github.io.
 *
 * De Stijl / early-modernist palette and type: paper background, black
 * rules, sharp corners, plain borders. Three aurora colours sampled from
 * the AusMIS logo standing in for Mondrian's red/yellow/blue. Jost is a
 * free geometric sans built in the spirit of 1920s-30s faces like Futura
 * and Kabel.
 *
 * --ink/--paper are the two poles of the theme and flip between light and
 * dark mode (see the prefers-color-scheme block below); --fill-light and
 * --fill-dark do not flip -- they're for text sitting on top of a fixed
 * aurora-colour block (a tag, a swatch, the primary button), which needs a
 * constant amount of contrast regardless of which theme the page is in.
 *
 * Not used by /games/ -- that page keeps its own retro-terminal look on
 * purpose.
 */

:root {
    --paper: #eae5d8;
    --paper-alt: #dfd9c9;
    --ink: #27242b;
    --ink-soft: #5c574e;
    --accent: #6b4a96;

    --green: #4fb37a;
    --violet: #5b3e82;
    --indigo: #34345c;

    --fill-light: #f5f2ea;
    --fill-dark: #201e26;

    --rule: 3px;
    --rule-thick: 6px;

    --font: "Jost", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

/* Dark mode: automatic from the OS/browser unless overridden by the toggle
   (data-theme, set by assets/js/theme.js + localStorage), and always
   applied when the toggle has explicitly picked dark. */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --paper: #201e26;
        --paper-alt: #2a2732;
        --ink: #e7e2d5;
        --ink-soft: #a39c8d;
        --accent: #b79bde;
    }
}
:root[data-theme="dark"] {
    --paper: #201e26;
    --paper-alt: #2a2732;
    --ink: #e7e2d5;
    --ink-soft: #a39c8d;
    --accent: #b79bde;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font);
    font-weight: 400;
    line-height: 1.65;
    font-size: 17px;
}
a { color: var(--accent); }
a:hover { color: var(--ink); }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 780px; margin: 0 auto; padding: 0 24px; }

/* rules ------------------------------------------------------------------
   Plain solid borders between the fixed sections of a page. */
header.site { border-bottom: var(--rule) solid var(--ink); }
footer.site { border-top: var(--rule) solid var(--ink); }
.page-head { border-bottom: var(--rule) solid var(--ink); }
section + section { border-top: var(--rule) solid var(--ink); }
.related { border-top: var(--rule) solid var(--ink); }

/* nav ---------------------------------------------------------------- */
header.site {
    position: sticky; top: 0; z-index: 20;
    background: var(--paper);
}
header.site nav {
    max-width: 980px; margin: 0 auto; padding: 16px 24px;
    display: flex; align-items: center; justify-content: space-between;
    gap: 16px; flex-wrap: wrap;
}
header.site.narrow nav { max-width: 780px; }
.logo-link { display: block; flex: none; line-height: 0; }
.site-logo { display: block; width: 51px; height: 51px; }
.logo-link:hover .site-logo { opacity: 0.8; }
.navlinks { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.navgroup { display: flex; align-items: center; gap: 12px; }
.navlinks a {
    color: var(--ink); text-decoration: none; font-size: 0.95em;
    text-transform: uppercase; letter-spacing: 0.04em; font-weight: 500;
    border-bottom: 2px solid transparent;
}
.navlinks a:hover { border-bottom-color: var(--accent); color: var(--ink); }
.back-link {
    color: var(--ink); text-decoration: none; font-size: 0.95em;
    text-transform: uppercase; letter-spacing: 0.04em; font-weight: 500;
}
.back-link:hover { color: var(--accent); }

.theme-toggle {
    background: none; border: none; color: var(--ink); cursor: pointer;
    width: 34px; height: 34px; font-size: 1.05em; line-height: 1;
    display: inline-flex; align-items: center; justify-content: center;
    flex: none;
}
.theme-toggle:hover { background: var(--paper-alt); }

/* type ----------------------------------------------------------------*/
.eyebrow {
    display: inline-block; color: var(--accent); font-size: 0.85em;
    letter-spacing: 0.18em; text-transform: uppercase; margin-bottom: 14px;
    font-weight: 600;
}
h1 {
    font-weight: 700; letter-spacing: -0.01em; text-transform: uppercase;
}
h1.name {
    font-size: 2.6em; margin-bottom: 18px; line-height: 1.05;
    font-weight: 600; letter-spacing: 0; text-transform: none;
}
h1.name::after {
    content: ""; display: block; width: 160px; height: 4px; margin-top: 12px;
    background: var(--accent);
}
.title-line { color: var(--ink-soft); font-size: 1.2em; margin-bottom: 4px; }
.affil-line { color: var(--ink-soft); font-size: 1.05em; margin-bottom: 22px; }
.affil-line a { color: var(--ink-soft); text-decoration: underline; }
.affil-line a:hover { color: var(--accent); }
.lede { max-width: 640px; color: var(--ink); font-size: 1.1em; margin-bottom: 28px; }
.page-sub, .section-sub { color: var(--ink-soft); margin-bottom: 26px; max-width: 620px; }

.page-head { padding: 56px 0 32px; }

/* cards, buttons, media frames -------------------------------------------
   One plain border, no radius, no rotation. Same treatment everywhere. */
.card, .btn, .media, .embed-poster, .hero-map {
    border: var(--rule) solid var(--ink);
}

/* buttons ---------------------------------------------------------------*/
.btnrow { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 18px; text-decoration: none;
    font-size: 0.9em; text-transform: uppercase; letter-spacing: 0.04em; font-weight: 600;
    color: var(--ink); background: var(--paper);
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.primary { background: var(--violet); color: var(--fill-light); }
.btn.primary:hover { background: var(--ink); color: var(--paper); }

/* sections ----------------------------------------------------------- */
section { padding: 60px 0; }
h2.section-title {
    font-size: 1.6em; margin-bottom: 10px; color: var(--ink);
    text-transform: uppercase; font-weight: 700; letter-spacing: -0.005em;
}
main h2 { font-size: 1.3em; margin: 36px 0 14px; color: var(--ink); text-transform: uppercase; font-weight: 700; }
main p { margin-bottom: 18px; color: var(--ink); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 16px; }

.card {
    background: var(--paper); padding: 24px;
}
.card h3 {
    font-size: 1.08em; margin-bottom: 10px; color: var(--ink); font-weight: 700;
    display: flex; align-items: center; gap: 8px;
}
.card p { color: var(--ink-soft); font-size: 0.95em; }
.card .meta { color: var(--ink-soft); font-size: 0.82em; margin-top: 8px; }
.card .tag {
    display: inline-block; font-size: 0.72em; letter-spacing: 0.08em; text-transform: uppercase;
    color: var(--fill-light); background: var(--indigo); padding: 3px 9px;
    margin-bottom: 12px; font-weight: 600;
}
.card a.card-link {
    display: inline-block; margin-top: 12px; font-size: 0.9em; text-decoration: none;
    font-weight: 600; color: var(--accent);
}
.card a.card-link:hover { text-decoration: underline; }

/* colour swatches, used as the .tag / accent alternative when a block of
   solid aurora colour reads better than the indigo pill. Text colour here
   is fixed (not the flipping --ink/--paper) because the fill itself is
   fixed -- a light-mode-only pairing would lose contrast in dark mode. */
.swatch-green { background: var(--green); color: var(--fill-dark); }
.swatch-violet { background: var(--violet); color: var(--fill-light); }
.swatch-indigo { background: var(--indigo); color: var(--fill-light); }

/* media / captions ------------------------------------------------------*/
.media { margin: 28px 0; overflow: hidden; }
.media img, .media svg, .media video { display: block; width: 100%; height: auto; }
.media.light { background: var(--paper-alt); padding: 10px; }
.caption { color: var(--ink-soft); font-size: 0.85em; margin-top: 8px; margin-bottom: 18px; }
.caption a { color: var(--ink-soft); text-decoration: underline; }

.embed-toolbar {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    margin: 28px 0 0; flex-wrap: wrap;
}
.embed-toolbar .embed-label { color: var(--ink-soft); font-size: 0.85em; text-transform: uppercase; letter-spacing: 0.03em; }
.embed-poster {
    display: block; margin-top: 12px; position: relative;
    overflow: hidden;
}
.embed-poster img { display: block; width: 100%; height: auto; }
.embed-poster .launch-hint {
    position: absolute; inset: auto 0 0 0; padding: 10px 16px;
    background: var(--ink); opacity: 0.85;
    color: var(--fill-light); font-size: 0.85em;
    display: flex; align-items: center; gap: 6px; text-transform: uppercase; letter-spacing: 0.03em;
}

/* related / lists -------------------------------------------------------*/
.related { margin-top: 44px; padding-top: 30px; }
.related h2 { margin-top: 0; }
.related ul, .publist { list-style: none; }
.related li { padding: 10px 0; border-bottom: 1px solid var(--paper-alt); }
.related a { text-decoration: none; font-weight: 500; }
.related a:hover { text-decoration: underline; }

/* footer ------------------------------------------------------------- */
footer.site {
    padding: 40px 0 60px; text-align: center; color: var(--ink-soft); font-size: 0.9em;
}
footer.site .footlinks { margin-bottom: 14px; display: flex; justify-content: center; gap: 18px; flex-wrap: wrap; }
footer.site .footlinks a { text-decoration: none; text-transform: uppercase; font-size: 0.85em; letter-spacing: 0.03em; }
footer.site .footlinks a:hover { text-decoration: underline; }

@media (max-width: 600px) {
    h1.name { font-size: 2.1em; }
    body { font-size: 16px; }
    section { padding: 44px 0; }
}