/* Design tokens, reset, page frame, and the masthead. */

:root {
  color-scheme: dark;

  --bg: oklch(0.18 0.008 255);
  --bg-texture: oklch(0.23 0.01 255);
  --surface: oklch(0.22 0.009 255);
  --surface-raised: oklch(0.26 0.011 255);
  --surface-sunk: oklch(0.15 0.008 255);
  --line: oklch(0.32 0.012 255);
  --line-soft: oklch(0.27 0.01 255);

  --ink: oklch(0.96 0.004 255);
  --ink-muted: oklch(0.74 0.012 255);
  --ink-faint: oklch(0.6 0.014 255);

  --accent: oklch(0.72 0.168 48);
  --accent-ink: oklch(0.2 0.03 48);
  --accent-alt: oklch(0.77 0.115 205);
  --danger: oklch(0.65 0.17 25);
  --good: oklch(0.72 0.14 148);

  --font-display: 'Silkscreen', 'Courier New', 'Lucida Console', monospace;
  --font-ui: 'Space Grotesk', 'Helvetica Neue', Helvetica, Arial, sans-serif;

  --radius: 4px;
  --gap: clamp(0.75rem, 2vw, 1.25rem);
  --tap: 44px;
}

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

html,
body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

body {
  min-height: 100dvh;
  background-color: var(--bg);
  /* A faint machined dot grid so the page is not a flat slab. */
  background-image: radial-gradient(var(--bg-texture) 1px, transparent 1px);
  background-size: 22px 22px;
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

h1,
h2,
h3,
p,
dl,
dd,
ul {
  margin: 0;
}

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

a {
  color: var(--accent-alt);
  text-underline-offset: 3px;
}

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 0.5rem;
  z-index: 20;
  padding: 0.6rem 0.9rem;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--font-display);
  font-size: 0.75rem;
  text-decoration: none;
}

.skip-link:focus-visible {
  top: 0.5rem;
}

/* Page frame ------------------------------------------------------------- */

.shell {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  width: min(100%, 1040px);
  min-height: 100dvh;
  margin-inline: auto;
  padding: clamp(0.75rem, 2.5vw, 1.5rem) clamp(0.75rem, 3vw, 1.75rem)
    calc(clamp(0.75rem, 2.5vw, 1.5rem) + env(safe-area-inset-bottom));
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line-soft);
}

.brand__kicker {
  font-family: var(--font-display);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.brand__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  margin-block: 0.15rem 0.25rem;
}

.brand__sub {
  font-size: 0.875rem;
  color: var(--ink-muted);
}

.masthead__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chip-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: var(--tap);
  padding: 0 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  font-family: var(--font-display);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    background-color 140ms ease,
    border-color 140ms ease,
    color 140ms ease;
}

.chip-btn:hover {
  background: var(--surface-raised);
  border-color: var(--ink-faint);
}

.chip-btn:active {
  background: var(--surface-sunk);
}

.chip-btn[aria-pressed='false'] {
  color: var(--ink-faint);
  border-style: dashed;
}

/* A dot marks "on" so the state is not carried by colour alone. */
.chip-btn[aria-pressed='true']::after {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--good);
}

.chip-btn--strong {
  background: var(--surface-raised);
  border-color: var(--ink-faint);
  color: var(--ink);
}

.colophon {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-top: auto;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.8125rem;
  color: var(--ink-faint);
}

.colophon__sig {
  white-space: nowrap;
}

/* Compact chrome on phones so the playfield keeps as much height as possible. */
@media (pointer: coarse), (max-width: 760px) {
  .shell {
    gap: 0.7rem;
  }

  .masthead {
    align-items: center;
    padding-bottom: 0.55rem;
  }

  .brand__sub {
    display: none;
  }

  .brand__title {
    font-size: 1.5rem;
    margin-block: 0.1rem 0;
  }

  .chip-btn {
    min-height: var(--tap);
    padding: 0 0.6rem;
    font-size: 0.625rem;
  }

  .colophon p:first-child {
    display: none;
  }

  .colophon {
    padding-top: 0.6rem;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .masthead__actions {
    gap: 0.3rem;
  }

  .chip-btn {
    padding: 0 0.5rem;
  }
}