/* The landing page. Colours are the brand's (brand/README.md); the page runs no script, and
   the drawings switch between light and dark through <picture>. */

:root {
  color-scheme: light dark;
  --paper: #f6f4ee;
  --card: #fffdf8;
  --ink: #1d2840;
  --muted: #4b5568;
  --line: #d9dde4;
  --navy: #1b2b4b;
  --on-navy: #ffffff;
  --on-navy-soft: #d4dcea;
  --teal: #175f63;
  --link: #175f63;
  --brass: #e6c878;
  --foe: #c9502f;
  --shade: #9481a7;
  --hero: #ebeef3;
  --code: #121a2c;
  --on-code: #e3e8f0;
  --serif: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Consolas, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f1728;
    --card: #16213a;
    --ink: #e3e8f0;
    --muted: #a3aec0;
    --line: #28344d;
    --navy: #3a5585;
    --on-navy-soft: #dbe3f0;
    --teal: #1f7479;
    --link: #8fd0cb;
    --foe: #d95b36;
    --shade: #a093b4;
    --hero: #131d33;
    --code: #0a1120;
  }
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1.0625rem/1.6 var(--sans);
}

img { max-width: 100%; height: auto; }
a { color: var(--link); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, .door:focus-visible {
  outline: 3px solid var(--brass);
  outline-offset: 3px;
  border-radius: 4px;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: color-mix(in srgb, var(--line) 55%, transparent);
  padding: 0.08em 0.32em;
  border-radius: 4px;
}

pre {
  margin: 0.75rem 0 1rem;
  padding: 1rem 1.1rem;
  background: var(--code);
  color: var(--on-code);
  border-radius: 10px;
  overflow-x: auto;
  line-height: 1.55;
}
pre code { background: none; padding: 0; font-size: 0.92rem; color: inherit; }

h1, h2, h3 { font-family: var(--serif); line-height: 1.2; margin: 0; }
h2 { font-size: clamp(1.6rem, 3.6vw, 2.25rem); margin-bottom: 1rem; letter-spacing: -0.005em; }
h3 { font-size: 1.15rem; }

.wrap { width: min(1080px, 100% - 32px); margin-inline: auto; }

.skip {
  position: absolute;
  left: 16px;
  top: -3rem;
  padding: 0.5rem 0.9rem;
  background: var(--navy);
  color: var(--on-navy);
  border-radius: 6px;
  z-index: 2;
}
.skip:focus { top: 0.75rem; }

/* The header */
.top { border-bottom: 1px solid var(--line); background: var(--paper); }
.top-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 0.8rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  letter-spacing: -0.01em;
}
.brand img { display: block; }
.top nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; font-size: 0.97rem; }
.top nav a { color: var(--ink); text-decoration: none; }
.top nav a:hover { color: var(--link); text-decoration: underline; }

/* The first screen */
.hero {
  background: var(--hero);
  border-bottom: 1px solid var(--line);
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(2.5rem, 6vw, 4rem);
}
/* Capped so that the doors are on the first screen of a laptop. */
.banner { display: block; width: 100%; max-width: 760px; margin: 0 auto clamp(1rem, 2.5vw, 1.75rem); }
.hero h1 {
  font-size: clamp(2.1rem, 5.6vw, 3.6rem);
  letter-spacing: -0.015em;
  max-width: 18ch;
}
.lede { font-size: clamp(1.1rem, 2.1vw, 1.3rem); max-width: 60ch; margin: 1rem 0 0.5rem; }
.for { color: var(--muted); max-width: 60ch; margin: 0 0 1.75rem; }

.doors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.9rem;
}
.door {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  height: 100%;
  padding: 1rem 1.1rem 1.1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.door strong { font-size: 1.05rem; }
.door strong::after { content: " \2192"; color: var(--link); }
.door span { color: var(--muted); font-size: 0.95rem; line-height: 1.45; }
.door:hover { border-color: var(--link); transform: translateY(-2px); }
.door.primary { background: var(--navy); border-color: var(--navy); color: var(--on-navy); }
.door.primary strong::after { color: var(--brass); }
.door.primary span { color: var(--on-navy-soft); }
.door.primary:hover { border-color: var(--brass); }

/* Sections */
main > section { padding-block: clamp(2.75rem, 7vw, 5rem); }
main > section + section { border-top: 1px solid var(--line); }
.kicker {
  margin: 0 0 0.4rem;
  color: var(--link);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.text { max-width: 68ch; }
.more { margin-top: 1.25rem; font-weight: 600; }
.more a::after { content: " \2192"; }
.subhead { margin-top: clamp(2.25rem, 5vw, 3.25rem); font-size: 1.4rem; }

.sources {
  list-style: none;
  counter-reset: source;
  margin: 1.5rem 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 0.9rem;
}
.sources li {
  counter-increment: source;
  padding: 1rem 1.1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--teal);
  border-radius: 10px;
}
.sources h3::before {
  content: counter(source) ". ";
  color: var(--link);
}
.sources p { margin: 0.35rem 0 0; color: var(--muted); }

.screen { margin: 1.5rem 0 0; }
.screen img { display: block; width: 100%; border-radius: 12px; }
/* The video plays muted and loops, with controls to pause it. A reader who asks for less
   motion sees its still frame instead, which the page shows without a script. */
.film { margin: 1.5rem 0 0; }
.film video, .film .still {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  background: #0f1728;
}
.film .still { display: none; }
@media (prefers-reduced-motion: reduce) {
  .film video { display: none; }
  .film .still { display: block; }
}
.words-of { margin-top: 0.9rem; color: var(--muted); }
.words-of summary { cursor: pointer; color: var(--ink); font-weight: 600; }
.words { margin: 0.6rem 0 0; padding-left: 1.4rem; }
.words li { margin-bottom: 0.2rem; }

.lanes {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 0.9rem;
}
.lane {
  padding: 1.1rem 1.2rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 5px solid var(--navy);
  border-radius: 10px;
}
.lane.agent { border-top-color: var(--teal); }
.lane.person { border-top-color: var(--brass); }
.lane p { margin: 0.45rem 0 0; color: var(--muted); }

.foes {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  /* Six villains: rows of 2, 3 or 6, never 5 and 1. The shadows keep the same widths. */
  grid-template-columns: repeat(2, 1fr);
  gap: 0.9rem;
}
@media (min-width: 640px) { .foes { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1000px) { .foes { grid-template-columns: repeat(6, 1fr); } }
.foe {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1rem 0.9rem 1.1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-bottom: 4px solid var(--foe);
  border-radius: 12px;
}
.foe img { display: block; width: 96px; height: 96px; }
.foe h3 { font-size: 1.02rem; margin-top: 0.6rem; }
.foe p { margin: 0.3rem 0 0.7rem; color: var(--muted); font-size: 0.93rem; line-height: 1.45; }
.gate {
  margin-top: auto;
  padding: 0.12rem 0.6rem;
  background: var(--navy);
  color: var(--on-navy);
  border-radius: 999px;
  font: 700 0.82rem/1.5 var(--mono);
}
.shadows .foe { border-style: dashed; border-bottom: 4px dashed var(--shade); }
.shadows .ally { border-style: solid; border-bottom: 4px solid var(--brass); }

.evidence { max-width: 68ch; padding-left: 1.2rem; }
.evidence li { margin-bottom: 0.6rem; }

.ways {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem 2rem;
}
.way p { margin: 0.5rem 0; }

/* The footer */
.foot {
  border-top: 1px solid var(--line);
  padding-block: 2rem 2.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}
.foot p { margin: 0.3rem 0; }
.foot a { margin-right: 1.25rem; }

@media (max-width: 520px) {
  .ways { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .door { transition: none; }
  .door:hover { transform: none; }
}