/* The website of Broadcast Empire, in the game's own look: design/style.md explains it,
   and the tokens below are the ones at the top of src/ui/styles.css. */

@font-face {
  font-family: 'Fjalla One';
  font-weight: 400;
  font-display: swap;
  src: url('fonts/fjalla-one-latin-400-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Assistant';
  font-weight: 300;
  font-display: swap;
  src: url('fonts/assistant-latin-300-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Assistant';
  font-weight: 400;
  font-display: swap;
  src: url('fonts/assistant-latin-400-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Assistant';
  font-weight: 600;
  font-display: swap;
  src: url('fonts/assistant-latin-600-normal.woff2') format('woff2');
}

:root {
  /* Palette */
  --ink: #452a65;
  --purple: #6631d2;
  --purple-deep: #3c199b;
  --lavender: #b0a2f2;
  --lilac: #e5dcff;
  --mist: #f7f5ff;
  --red: #ff7979;
  --red-deep: #aa4949;
  --yellow: #fcee21;
  --orange: #fbb03b;
  --navy: #0b2a4f;
  --sky-top: #6a3be0;
  --sky-bottom: #a55ccb;

  /* Roles */
  --bg: #e9e2ff;
  --surface: #ffffff;
  --surface-sunk: var(--mist);
  --text: var(--ink);
  --text-muted: #6a5896;
  --heading: #0b0b21;
  --border: var(--lilac);
  --edge: var(--lavender);
  --accent: var(--purple);
  --accent-deep: var(--purple-deep);
  --shadow: rgb(69 42 101 / 0.2);

  --font-display: 'Fjalla One', 'Arial Narrow', Impact, sans-serif;
  --font-body: 'Assistant', 'Segoe UI', system-ui, sans-serif;
  --radius: 4px;

  color-scheme: light;
}

/* The same scene later at night. The site follows the visitor's system. */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #120b20;
    --surface: #1f1535;
    --surface-sunk: #2a1e47;
    --text: #e9e2ff;
    --text-muted: #a797d1;
    --heading: #ffffff;
    --border: #3a2c5e;
    --edge: #55448c;
    --accent: #9470f7;
    --accent-deep: #5a2fc0;
    --shadow: rgb(0 0 0 / 0.5);

    color-scheme: dark;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 300;
  line-height: 1.55;
}

h1,
h2,
h3 {
  margin: 0 0 0.5em;
  color: var(--heading);
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.3rem;
}

p,
ul,
ol,
dl,
pre {
  margin: 0 0 1em;
}

strong,
dt {
  font-weight: 600;
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--heading);
}

:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

code {
  padding: 0.1em 0.35em;
  border-radius: var(--radius);
  background: var(--surface-sunk);
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 0.82em;
  font-weight: 400;
  overflow-wrap: anywhere;
}

pre {
  padding: 12px 14px;
  border-radius: var(--radius);
  background: var(--surface-sunk);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

pre code {
  padding: 0;
  background: none;
}

.muted {
  color: var(--text-muted);
  font-weight: 400;
}

.wrap {
  width: min(1120px, 100% - 40px);
  margin-inline: auto;
}

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  z-index: 10;
  padding: 8px 12px;
  background: var(--surface);
}

.skip:focus {
  left: 8px;
}

/* The evening sky at the head of every page */

.sky {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-bottom: 6px solid var(--navy);
  background: linear-gradient(180deg, var(--sky-top), var(--sky-bottom) 70%);
  color: #ffffff;
}

.bar {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  padding-block: 18px;
}

.logo {
  display: flex;
  flex-direction: column;
  font-family: var(--font-display);
  line-height: 0.95;
  text-decoration: none;
  text-transform: uppercase;
  color: var(--yellow);
  text-shadow: 0 2px 0 var(--orange);
}

.logo:hover {
  color: var(--yellow);
}

.logo span:first-child {
  font-size: 1.5rem;
  letter-spacing: 0.02em;
}

.logo span:last-child {
  font-size: 0.98rem;
  letter-spacing: 0.32em;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
}

nav a {
  padding: 6px 12px;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
  color: #ffffff;
}

nav a:hover {
  background: rgb(255 255 255 / 0.16);
  color: #ffffff;
}

nav a[aria-current='page'] {
  background: var(--yellow);
  color: #2a1745;
  box-shadow: 0 3px 0 var(--orange);
}

.page-head {
  position: relative;
  padding-block: 20px 34px;
}

.page-head h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5.5vw, 3.2rem);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--yellow);
  text-shadow: 0 3px 0 var(--orange);
}

/* The home page: the title art fills the sky, as on the game's home screen */

.home .sky {
  min-height: clamp(460px, 52vw, 88vh);
}

.home .bar {
  justify-content: flex-end;
}

.home .bar .logo {
  display: none;
}

.hero {
  position: relative;
  padding-block: 8px 48px;
}

.hero h1 {
  display: flex;
  flex-direction: column;
  margin: 0 0 18px;
  line-height: 0.95;
  text-transform: uppercase;
  color: var(--yellow);
  text-shadow: 0 4px 0 var(--orange);
}

.hero h1 span:first-child {
  font-size: clamp(3rem, 8vw, 5.4rem);
  letter-spacing: 0.02em;
}

.hero h1 span:last-child {
  font-size: clamp(1.95rem, 5.2vw, 3.5rem);
  letter-spacing: 0.32em;
}

.hero p {
  max-width: 21em;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 400;
  line-height: 1.35;
  text-shadow: 0 1px 0 rgb(42 23 69 / 0.5);
}

.title-art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.art-star {
  fill: var(--lilac);
  opacity: 0.8;
}

/* Fainter than in the game: here words stand in front of the clouds. */
.art-cloud {
  fill: var(--lavender);
  opacity: 0.4;
}

.art-haze {
  fill: var(--lavender);
}

.art-city {
  fill: var(--navy);
}

.art-lit,
.art-pane.lit,
.art-lamp {
  fill: var(--yellow);
}

.art-mast {
  fill: none;
  stroke: var(--lilac);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.art-mast .art-dish {
  fill: var(--lilac);
  stroke: none;
}

.art-glow {
  fill: var(--yellow);
  opacity: 0.3;
}

.art-wall,
.art-hut {
  fill: var(--red);
}

.art-side {
  fill: var(--purple-deep);
}

.art-trim {
  fill: var(--red-deep);
}

.art-pane {
  fill: var(--ink);
}

.art-pane.dim {
  opacity: 0.55;
}

.art-bokeh {
  fill: var(--yellow);
  opacity: 0.16;
}

/* On a narrow screen the city stands under the words, not behind them. */
@media (max-width: 760px) {
  .home .sky {
    min-height: 0;
  }

  .hero {
    padding-bottom: 12px;
  }

  .title-art {
    position: static;
    order: 3;
    height: 62vw;
  }
}

/* Things to click stand on an edge */

.button {
  display: inline-block;
  padding: 10px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 3px 0 var(--edge);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.button:hover {
  color: var(--text);
  filter: brightness(1.06);
}

.button:active {
  transform: translateY(3px);
  box-shadow: none;
}

.button.primary {
  border-color: transparent;
  background: var(--purple);
  box-shadow: 0 3px 0 var(--purple-deep);
  color: #ffffff;
}

.sky .button {
  border-color: transparent;
  background: #ffffff;
  box-shadow: 0 3px 0 var(--navy);
  color: var(--ink);
}

.sky .button.primary {
  background: var(--yellow);
  box-shadow: 0 3px 0 var(--orange);
  color: #2a1745;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 12px;
  margin-bottom: 0;
}

/* The page */

main {
  padding-block: 40px 56px;
}

main > * + * {
  margin-top: 40px;
}

main > h2 + * {
  margin-top: 0;
}

.intro {
  max-width: 46em;
  font-size: 1.25rem;
}

.intro + .actions {
  margin-top: 20px;
}

.window {
  padding: 22px 26px 26px;
  border-bottom: 4px solid var(--border);
  background: var(--surface);
  box-shadow: 6px 6px 0 var(--shadow);
}

.window > h2,
.window > summary {
  margin: -22px -26px 20px;
  padding: 14px 26px 12px;
  border-bottom: 4px solid var(--border);
  background: var(--surface-sunk);
}

.window > :last-child {
  margin-bottom: 0;
}

.lead {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  align-items: center;
  gap: 36px;
}

.lead .actions {
  margin-top: 24px;
}

.shot {
  margin: 0;
}

.shot img,
.card img,
.gallery img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--surface-sunk);
}

.shot img {
  border-radius: var(--radius);
  box-shadow: 6px 6px 0 var(--shadow);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  overflow: hidden;
  padding: 0 20px 18px;
  border-radius: var(--radius);
  border-bottom: 5px solid var(--edge);
  background: var(--surface);
}

.card > a:first-child,
.card > img:first-child {
  display: block;
  margin: 0 -20px 16px;
}

.card > h2:first-child {
  margin-top: 20px;
}

.card > :last-child {
  margin-bottom: 0;
}

.downloads h2 {
  margin-bottom: 0;
  font-size: 2rem;
}

.downloads .muted {
  margin-bottom: 14px;
}

.downloads .button {
  display: block;
  text-align: center;
}

.downloads ol {
  padding-left: 1.2em;
}

.downloads li + li {
  margin-top: 0.4em;
}

.file {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 400;
  overflow-wrap: anywhere;
}

.columns {
  padding-left: 1.2em;
  columns: 2 320px;
  column-gap: 40px;
}

.columns li {
  break-inside: avoid;
  margin-bottom: 0.35em;
}

.facts {
  display: grid;
  grid-template-columns: minmax(8em, max-content) 1fr;
  gap: 0;
}

.facts dt,
.facts dd {
  margin: 0;
  padding: 10px 0;
  border-top: 3px solid var(--surface-sunk);
}

.facts dt {
  padding-right: 28px;
}

.facts dt:first-of-type,
.facts dt:first-of-type + dd {
  padding-top: 0;
  border-top: 0;
}

.facts ul {
  margin: 0.4em 0 0;
  padding-left: 1.2em;
}

/* Media */

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 330px), 1fr));
  gap: 24px;
}

.gallery figure {
  overflow: hidden;
  margin: 0;
  border-radius: var(--radius);
  border-bottom: 5px solid var(--edge);
  background: var(--surface);
}

.gallery figcaption {
  padding: 12px 16px 14px;
  font-size: 1rem;
  line-height: 1.4;
}

.gallery figcaption strong {
  display: block;
  color: var(--heading);
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 400;
}

.gallery video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000000;
}

/* Changelog */

.version h3 {
  margin-top: 1.4em;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.version ul {
  padding-left: 1.2em;
}

.version li + li {
  margin-top: 0.5em;
}

.version .when {
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
}

details.window > summary {
  margin-bottom: 0;
  color: var(--heading);
  font-family: var(--font-display);
  font-size: 1.75rem;
  line-height: 1.15;
  cursor: pointer;
}

details.window[open] > summary {
  margin-bottom: 20px;
}

details.window:not([open]) {
  padding-bottom: 0;
}

details.window:not([open]) > summary {
  border-bottom: 0;
}

details.window + details.window {
  margin-top: 24px;
}

.form {
  margin-bottom: 1em;
  border-radius: var(--radius);
  background: #ffffff;
}

.form iframe {
  display: block;
  width: 100%;
  max-width: 640px;
  height: 720px;
  margin-inline: auto;
  border: 0;
}

/* The foot of the page */

.foot {
  padding-block: 26px 34px;
  border-top: 4px solid var(--border);
  background: var(--surface);
  font-size: 1rem;
  font-weight: 400;
}

.foot p {
  margin: 0;
}

.foot p + p {
  margin-top: 4px;
}

@media (max-width: 760px) {
  body {
    font-size: 1.0625rem;
  }

  .lead {
    grid-template-columns: 1fr;
  }

  .window {
    padding: 18px 18px 22px;
  }

  .window > h2,
  .window > summary {
    margin: -18px -18px 16px;
    padding-inline: 18px;
  }

  .facts {
    grid-template-columns: 1fr;
  }

  .facts dd {
    padding-top: 0;
    border-top: 0;
  }

  .facts dt:first-of-type + dd {
    padding-top: 0;
  }
}