/* Challenge Ada Lovelace showcase site.
   Colours and fonts come from the Beamer "Ada" theme (Communication/modeles/beamer-ada/). */

@font-face { font-family: "Quicksand"; src: url("../fonts/Quicksand-Regular.ttf") format("truetype"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Quicksand"; src: url("../fonts/Quicksand-Medium.ttf") format("truetype"); font-weight: 500; font-display: swap; }
@font-face { font-family: "Quicksand"; src: url("../fonts/Quicksand-Bold.ttf") format("truetype"); font-weight: 700; font-display: swap; }
@font-face { font-family: "Fira Mono"; src: url("../fonts/FiraMono-Bold.otf") format("opentype"); font-weight: 700; font-display: swap; }

:root {
  /* Logo palette */
  --violet: #5754A3;
  --violet-dark: #3E3B80;
  --sky: #7AC9EC;
  --sky-light: #CDEBF8;
  --yellow: #FFE100;
  --ink: #333333;
  --lilac: #D5D4E8;
  --mist: #F3F4FA;
  --grey: #8A8C91;
  --check: #C2410C;
  --prompt: #2E8BB8;

  /* Roles */
  --bg: #FFFFFF;
  --surface: var(--mist);
  --text: var(--ink);
  --muted: #5F6166;
  --heading: var(--violet);
  --link: var(--violet);
  --link-hover: var(--violet-dark);
  --border: var(--lilac);
  --header-bg: #FFFFFF;
  --footer-bg: var(--violet);
  --footer-text: #FFFFFF;

  --font: "Quicksand", "Segoe UI", system-ui, sans-serif;
  --mono: "Fira Mono", ui-monospace, "DejaVu Sans Mono", monospace;
  --radius: 0.9rem;
  --wrap: 68rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1C1B2E;
    --surface: #26254A;
    --text: #E9E9F2;
    --muted: #B4B5C2;
    --heading: #B9B7F0;
    --link: #A9D9F2;
    --link-hover: #FFFFFF;
    --border: #3A3970;
    --header-bg: #1C1B2E;
    --footer-bg: #15142A;
    --prompt: var(--sky);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1.0625rem;
  font-weight: 500; /* Quicksand Regular is thin: Medium reads better */
  line-height: 1.6;
}
img { max-width: 100%; height: auto; }
a { color: var(--link); text-underline-offset: 0.15em; }
a:hover { color: var(--link-hover); }
:focus-visible { outline: 3px solid var(--sky); outline-offset: 2px; border-radius: 4px; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 1rem; }
.skip { position: absolute; left: -999px; top: 0; background: var(--yellow); color: var(--ink); padding: 0.5rem 1rem; z-index: 10; }
.skip:focus { left: 1rem; }

/* Header: logo, cartouche, menu, and the cloud stripes of the slides. */
.site-header { background: var(--header-bg); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem 1.5rem; padding-top: 0.75rem; padding-bottom: 0.75rem; }
.brand { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; }
.cartouche { display: inline-flex; flex-direction: column; background: var(--violet); color: #FFFFFF; border-radius: 0.7rem; padding: 0.3rem 0.75rem 0.35rem; font-family: var(--mono); line-height: 1.15; }
.cartouche-top { font-size: 1rem; letter-spacing: 0.04em; }
.cartouche-bottom { font-size: 0.72rem; }
.menu ul { display: flex; flex-wrap: wrap; gap: 0.25rem 1.1rem; list-style: none; margin: 0; padding: 0; }
.menu a { display: inline-block; text-decoration: none; font-weight: 500; color: var(--text); padding: 0.4rem 0.1rem 0.25rem; border-bottom: 3px solid transparent; }
.menu a:hover { color: var(--link); }
.menu a[aria-current="page"] { border-bottom-color: var(--yellow); color: var(--heading); }

/* Titles: sky prompt and yellow cursor, as in the Beamer theme. */
h1, h2, h3, .section-title, .footer-title, .card-title { font-family: var(--mono); color: var(--heading); line-height: 1.25; }
.prompt { color: var(--prompt); margin-right: 0.45em; }
.cursor { display: inline-block; width: 0.5em; height: 0.9em; margin-left: 0.25em; background: var(--yellow); vertical-align: -0.08em; }
.page-title { font-size: clamp(1.7rem, 4vw, 2.4rem); margin: 2.5rem 0 1.25rem; }
.section-title { font-size: 1.4rem; margin: 2.5rem 0 1rem; }

/* Long-form content */
main { min-height: 60vh; padding-bottom: 3rem; }
/* Reading column: aligned on the left edge of the page, limited to a comfortable width. */
.prose > * { max-width: 46rem; }
.prose h2 { font-size: 1.35rem; margin: 2.25rem 0 0.75rem; }
.prose h2::before { content: ">"; color: var(--prompt); margin-right: 0.45em; }
.prose h3 { font-size: 1.1rem; margin: 1.75rem 0 0.5rem; }
.prose ul { padding-left: 1.2rem; }
.prose li { margin: 0.3rem 0; }
.prose li::marker { color: var(--prompt); }
.table-wrap { overflow-x: auto; margin: 1rem 0 1.5rem; }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.prose th, .prose td { text-align: left; vertical-align: top; padding: 0.45rem 0.6rem; border-bottom: 1px solid var(--border); }
.prose th { color: var(--heading); font-weight: 700; background: var(--surface); }
.prose blockquote { margin: 1.5rem 0; padding: 0.75rem 1.25rem; border-left: 5px solid var(--yellow); background: var(--surface); border-radius: 0 var(--radius) var(--radius) 0; font-size: 1.1rem; }
.prose blockquote p { margin: 0.4rem 0; }
.meta { color: var(--muted); font-size: 0.92rem; margin: 0 0 0.25rem; }
.back { margin-top: 2.5rem; }

/* Home: hero */
.hero { position: relative; overflow: hidden; background: linear-gradient(180deg, var(--surface), var(--bg)); }
/* The cloud stripes of the slides, top right. */
.hero::before, .hero::after { content: ""; position: absolute; height: 0.8rem; border-radius: 999px; pointer-events: none; }
.hero::before { top: 1.2rem; right: -2rem; width: 11rem; background: var(--sky); }
.hero::after { top: 2.6rem; right: 2.5rem; width: 6.5rem; background: var(--sky-light); }
.hero-inner { display: grid; grid-template-columns: 1fr; gap: 1.5rem; align-items: center; padding-top: 2.5rem; padding-bottom: 2rem; }
.hero-title { font-size: clamp(1.8rem, 5vw, 2.9rem); margin: 0.75rem 0 1rem; }
.hero-lead { font-size: 1.2rem; max-width: 38rem; margin: 0 0 1.5rem; }
.hero-logo { justify-self: center; width: min(320px, 70vw); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0; }
@media (min-width: 52rem) {
  .hero-inner { grid-template-columns: 1.4fr 1fr; padding-top: 3.5rem; padding-bottom: 3rem; }
}

.button { display: inline-block; background: var(--violet); color: #FFFFFF; text-decoration: none; font-weight: 700; padding: 0.6rem 1.3rem; border-radius: 999px; border: 2px solid var(--violet); }
.button:hover { background: var(--violet-dark); border-color: var(--violet-dark); color: #FFFFFF; }
.button-ghost { background: transparent; color: var(--link); }
.button-ghost:hover { background: var(--surface); color: var(--link-hover); }

/* Pills, cards, key figures */
.pill { display: inline-block; font-family: var(--mono); font-size: 0.85rem; padding: 0.1rem 0.6rem; border-radius: 0.5rem; color: var(--ink); vertical-align: 0.1em; }
.pill-sky { background: var(--sky-light); }
.pill-yellow { background: var(--yellow); }
.pill-violet { background: var(--violet); color: #FFFFFF; }
.pill-lilac { background: var(--lilac); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1rem; }
.card { background: var(--surface); border-top: 6px solid var(--violet); border-radius: var(--radius); padding: 1rem 1.25rem; }
.card p { margin: 0.25rem 0; }
.card-title { font-size: 1.15rem; margin: 0 0 0.25rem; }
.card-date { font-weight: 700; }
.card-soft { border-top-color: var(--sky); }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr)); gap: 0.75rem; margin: 1.5rem 0; }
.stat { background: var(--surface); border-radius: var(--radius); padding: 1rem 0.75rem; text-align: center; display: flex; flex-direction: column; gap: 0.2rem; }
.stat-value { font-family: var(--mono); font-size: 2rem; color: var(--heading); line-height: 1.1; }
.stat-label { color: var(--muted); font-size: 0.92rem; }

/* Facts still to be checked: visible on purpose, removed once verified. */
mark.check { background: var(--check); color: #FFFFFF; font-size: 0.78em; font-weight: 700; padding: 0.05rem 0.4rem; border-radius: 0.35rem; white-space: nowrap; }

/* News */
.news-list { list-style: none; padding: 0; margin: 1.5rem 0; }
.news-item { padding: 1rem 0; border-bottom: 1px solid var(--border); }
.news-item h2, .news-item h3 { font-size: 1.15rem; margin: 0.1rem 0 0.35rem; }
.news-item h2::before { content: none; }
.news-item h2 a, .news-item h3 a { text-decoration: none; }
.news-item p { margin: 0.2rem 0; }
.news-list-compact { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 0 1.5rem; }

/* Footer */
.site-footer { background: var(--footer-bg); color: var(--footer-text); padding: 2rem 0; }
.site-footer a { color: #FFFFFF; }
.site-footer .footer-title { color: #FFFFFF; font-size: 1rem; margin: 0 0 0.5rem; }
.site-footer .prompt { color: var(--sky); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: 0.25rem 0; }
.footer-inner { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 1.5rem; font-size: 0.95rem; }
.footer-inner p { margin: 0.25rem 0; }

/* Edition cards are links; edition pages start with a facts box. */
.card-link { display: block; text-decoration: none; color: var(--text); transition: transform 0.15s ease; }
.card-link:hover { color: var(--text); transform: translateY(-2px); }
.card-more { color: var(--link); font-weight: 700; font-size: 0.95rem; margin-top: 0.5rem !important; }
.facts { display: grid; gap: 0.35rem; background: var(--surface); border-left: 5px solid var(--violet); border-radius: 0 var(--radius) var(--radius) 0; padding: 0.9rem 1.25rem; margin: 0 0 1.5rem; }
.facts p { margin: 0; }
.facts-label { display: inline-block; min-width: 4.5rem; font-family: var(--mono); color: var(--heading); }

/* Photos */
.photo { margin: 1.75rem 0; }
.photo img { display: block; width: 100%; border-radius: var(--radius); }
.photo figcaption { color: var(--muted); font-size: 0.9rem; margin-top: 0.45rem; }
.photo-band { margin-top: 1.75rem; }
.photo-band .photo { max-width: none; margin: 0; }
.photo-band .photo img { max-height: 32rem; object-fit: cover; }
.breadcrumb { margin: 1.75rem 0 0; }
.breadcrumb + .page-title { margin-top: 0.5rem; }

/* Partners of the year: logos stay on white, also in dark mode. */
.partners-edition { font-family: var(--mono); color: var(--muted); margin: 0 0 0.75rem; }
.partners { display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: 1rem; margin: 0 0 1.5rem; }
.partner { background: var(--surface); border-radius: var(--radius); padding: 0.9rem; display: flex; flex-direction: column; gap: 0.35rem; }
.partner-logo { background: #FFFFFF; border-radius: 0.6rem; height: 5.5rem; display: flex; align-items: center; justify-content: center; padding: 0.6rem 1rem; }
.partner-logo img { max-height: 100%; max-width: 100%; object-fit: contain; }
.partner-name { font-family: var(--mono); font-size: 1.3rem; color: var(--violet); }
.partner-title { font-weight: 700; margin: 0.25rem 0 0; }
.partner-title a { text-decoration: none; }
.partner-text { font-size: 0.92rem; color: var(--muted); margin: 0; }
.small-note { font-size: 0.9rem; color: var(--muted); }
.signup-line { margin: 0.5rem 0 0.25rem !important; }
.signup-buttons { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin: 0.25rem 0 0 !important; }
.signup-soon { color: var(--muted); font-style: italic; margin: 0.25rem 0 0 !important; }

/* Key-figure icons and linked tiles. */
.stat-icon { color: var(--prompt); display: flex; justify-content: center; }
.stat-link { text-decoration: none; color: var(--text); }
.stat-link:hover { background: var(--lilac); color: var(--text); }
.stat-link .stat-label { text-decoration: underline; text-underline-offset: 0.15em; }
.partner-name { text-align: center; font-size: 1rem !important; line-height: 1.3; }

/* Respect the "reduce motion" setting. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .card-link, .card-link:hover { transition: none; transform: none; }
}

/* Videos */
.video { margin: 1.25rem 0 2rem; }
.video video { display: block; width: 100%; height: auto; border-radius: var(--radius); background: #000; }
.video figcaption { margin-top: 0.5rem; font-size: 0.95rem; }
.video .credit { color: var(--muted); }
.photo-small { max-width: 14rem !important; }
.photo-small img { background: #FFFFFF; padding: 0.5rem; border: 1px solid var(--border); }

/* Collapsible menu (narrow screens, JavaScript on). */
.menu-toggle { display: none; align-items: center; gap: 0.45rem; font: inherit; font-weight: 700; color: var(--heading); background: var(--surface); border: 2px solid var(--border); border-radius: 999px; padding: 0.45rem 0.95rem; cursor: pointer; min-height: 2.75rem; }
.menu-toggle:hover { border-color: var(--violet); }
@media (max-width: 64rem) {
  .js .site-header { position: relative; }
  .js .header-inner { flex-wrap: nowrap; }
  .js .menu { margin-left: auto; }
  .js .menu-toggle { display: inline-flex; }
  .js .menu ul { display: none; position: absolute; left: 0; right: 0; top: 100%; z-index: 20; flex-direction: column; gap: 0; padding: 0 1rem 0.5rem; background: var(--header-bg); border-bottom: 1px solid var(--border); box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12); }
  .js .menu.open ul { display: flex; }
  .js .menu li { border-bottom: 1px solid var(--border); }
  .js .menu a { display: block; padding: 0.75rem 0.25rem; border-bottom: none; border-left: 4px solid transparent; }
  .js .menu a[aria-current="page"] { border-left-color: var(--yellow); padding-left: 0.6rem; }
  .js .menu.open .bar1 { transform: translate(0, 6px) rotate(45deg); transform-origin: 12px 6px; }
  .js .menu.open .bar2 { opacity: 0; }
  .js .menu.open .bar3 { transform: translate(0, -6px) rotate(-45deg); transform-origin: 12px 18px; }
}

/* Photo gallery */
.gallery { list-style: none; padding: 0; margin: 1rem 0 2rem; display: grid; grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr)); gap: 0.6rem; }
.gallery li { margin: 0; }
.gallery a { display: block; border-radius: 0.6rem; overflow: hidden; }
.gallery img { display: block; width: 100%; aspect-ratio: 3 / 2; object-fit: cover; transition: transform 0.2s ease; }
.gallery a:hover img { transform: scale(1.03); }
@media (prefers-reduced-motion: reduce) { .gallery img, .gallery a:hover img { transition: none; transform: none; } }
.prose .gallery { padding-left: 0; }
.prose .gallery li { margin: 0; }

/* Gallery viewer (native dialog) */
.lightbox { padding: 0; border: none; background: transparent; max-width: min(96vw, 1600px); max-height: 96vh; overflow: visible; }
.lightbox::backdrop { background: rgba(10, 10, 25, 0.96); }
.lightbox figure { margin: 0; }
.lightbox img { display: block; max-width: min(96vw, 1600px); max-height: 84vh; width: auto; height: auto; border-radius: 0.6rem; }
.lightbox figcaption { color: #FFFFFF; background: rgba(10, 10, 25, 0.85); font-size: 0.95rem; margin: 0.6rem auto 0; padding: 0.4rem 0.8rem; border-radius: 0.5rem; text-align: center; width: fit-content; max-width: 100%; }
.lightbox button { position: fixed; display: flex; align-items: center; justify-content: center; width: 3rem; height: 3rem; border-radius: 999px; border: 2px solid rgba(255, 255, 255, 0.7); background: rgba(20, 20, 40, 0.75); color: #FFFFFF; font-size: 2rem; line-height: 1; cursor: pointer; }
.lightbox button:hover { background: var(--violet); }
.lightbox button:focus-visible { outline: 3px solid var(--yellow); outline-offset: 2px; }
.lightbox .lb-close { top: 1rem; right: 1rem; }
.lightbox .lb-prev { left: 1rem; top: 50%; transform: translateY(-50%); }
.lightbox .lb-next { right: 1rem; top: 50%; transform: translateY(-50%); }
.lightbox button[hidden] { display: none; }