/* BITROT website — palette and pixel look lifted straight from the game (32-colour palette). */

@font-face {
  font-family: "Press Start 2P";
  src: url("fonts/PressStart2P-Regular.ttf") format("truetype");
  font-display: swap;
}
@font-face {
  font-family: "VT323";
  src: url("fonts/VT323-Regular.ttf") format("truetype");
  font-display: swap;
}

:root {
  --black: #000000;
  --navy: #1d2b53;
  --navy-dark: #121a33;
  --plum: #7e2553;
  --dark-green: #008751;
  --brown-red: #ab5236;
  --dark-gray: #5f574f;
  --light-gray: #c2c3c7;
  --white: #fff1e8;
  --red: #ff004d;
  --yellow: #ffec27;
  --green: #00e436;
  --blue: #29adff;
  --indigo: #83769c;
  --pink: #ff77a8;
  --peach: #ffccaa;
  --dark-red: #7a1010;
  --blood: #b8102a;
  --orange: #ff7a1a;
  --gold: #ffcc33;
  --olive: #4a6a1f;
  --lime: #9ef53a;
  --teal: #0a6e6e;
  --sky: #6ad7ff;
  --steel: #2b3a4a;
  --slate: #4f6a80;
  --concrete: #8a8f8f;
  --mid-gray: #3a3a3a;

  --px: 4px;                 /* one "screen pixel" of chrome */
  --font-head: "Press Start 2P", "Courier New", monospace;
  --font-body: "VT323", "Courier New", monospace;
  --maxw: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--white);
  background-color: var(--navy);
  /* subtle 2-tone dither like the game's menu backdrop */
  background-image:
    repeating-linear-gradient(0deg, transparent 0 var(--px), rgba(0, 0, 0, 0.18) var(--px) calc(var(--px) * 2)),
    radial-gradient(circle at 20% 10%, #24356a 0, var(--navy) 45%, var(--navy-dark) 100%);
  background-attachment: fixed;
  font-family: var(--font-body);
  font-size: 22px;
  line-height: 1.35;
}
/* CRT scanlines over everything */
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.14) 0 1px, transparent 1px 3px);
  mix-blend-mode: multiply;
  z-index: 50;
}
img { max-width: 100%; display: block; }
.pixel { image-rendering: pixelated; image-rendering: crisp-edges; }
a { color: var(--sky); }
a:hover, a:focus-visible { color: var(--gold); }
:focus-visible { outline: var(--px) solid var(--gold); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

h1, h2, h3, h4, .btn, nav a, .tag, .kbd {
  font-family: var(--font-head);
  text-transform: uppercase;
  letter-spacing: 0;
}
h2 {
  font-size: 20px;
  color: var(--gold);
  text-shadow: var(--px) var(--px) 0 var(--black);
  margin: 0 0 24px;
  text-align: center;
}
h2::before, h2::after { content: "// "; color: var(--slate); }
h2::after { content: " //"; }
h3 { font-size: 13px; margin: 0 0 8px; color: var(--white); text-shadow: 2px 2px 0 var(--black); line-height: 1.5; }
p { margin: 0 0 12px; }
.muted { color: var(--light-gray); }
.small { font-size: 18px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
section { padding: 56px 0; }
section + section { border-top: var(--px) solid var(--black); }

/* ---------- pixel panels ---------- */
.panel {
  background: color-mix(in srgb, var(--steel) 85%, transparent);
  border: var(--px) solid var(--light-gray);
  box-shadow: 0 0 0 var(--px) var(--black), var(--px) var(--px) 0 var(--px) var(--black);
  padding: 20px;
  position: relative;
}
.panel.dark { background: color-mix(in srgb, var(--navy-dark) 92%, transparent); }
.panel.red { border-color: var(--blood); }
.panel.green { border-color: var(--green); }
.panel .corner {
  position: absolute; width: var(--px); height: var(--px); background: var(--navy);
}

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: var(--black);
  border-bottom: var(--px) solid var(--slate);
}
.nav .wrap { display: flex; align-items: center; gap: 20px; min-height: 56px; flex-wrap: wrap; }
.nav .brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.nav .brand img { height: 24px; width: auto; }
.nav ul { list-style: none; display: flex; gap: 6px 18px; margin: 0 0 0 auto; padding: 0; flex-wrap: wrap; }
.nav a { font-size: 10px; color: var(--light-gray); text-decoration: none; padding: 8px 0; }
.nav a:hover, .nav a:focus-visible { color: var(--gold); }
.nav a.cta { color: var(--black); background: var(--green); padding: 8px 12px; box-shadow: 2px 2px 0 var(--black); }
.nav a.cta:hover { background: var(--lime); color: var(--black); }

/* ---------- hero ---------- */
.hero { padding: 56px 0 40px; text-align: center; border-top: 0; }
.hero .logo { width: min(512px, 90%); margin: 0 auto 14px; filter: drop-shadow(var(--px) var(--px) 0 var(--black)); }
.hero .tag {
  font-size: 12px; color: var(--lime); text-shadow: 2px 2px 0 var(--black); line-height: 1.8; margin: 0 0 10px;
}
.hero .lead { font-size: 26px; max-width: 760px; margin: 0 auto 26px; color: var(--white); }
.cta-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; align-items: center; margin-bottom: 8px; }
.cta-note { font-size: 18px; color: var(--light-gray); margin-bottom: 30px; }
.btn {
  display: inline-block; font-size: 12px; line-height: 1; text-decoration: none; text-align: center;
  color: var(--black); background: var(--green);
  padding: 16px 22px; border: 0;
  box-shadow: 0 0 0 var(--px) var(--black), var(--px) var(--px) 0 var(--px) var(--black);
  cursor: pointer; position: relative; top: 0;
  transition: none;
}
.btn:hover, .btn:focus-visible { background: var(--lime); color: var(--black); }
.btn:active { top: var(--px); box-shadow: 0 0 0 var(--px) var(--black); }
.btn.alt { background: var(--slate); color: var(--white); }
.btn.alt:hover, .btn.alt:focus-visible { background: var(--sky); color: var(--black); }
.btn.gold { background: var(--gold); }
.btn small { display: block; font-family: var(--font-body); text-transform: none; font-size: 16px; margin-top: 8px; opacity: 0.9; }

.crt {
  margin: 0 auto; max-width: 960px;
  border: var(--px) solid var(--light-gray);
  box-shadow: 0 0 0 var(--px) var(--black), 0 0 0 calc(var(--px) * 3) var(--steel), 0 0 0 calc(var(--px) * 4) var(--black), 0 24px 60px rgba(0, 0, 0, 0.6);
  background: var(--black);
  position: relative;
}
.crt img { width: 100%; height: auto; }
.crt .glare {
  position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(115deg, rgba(255, 255, 255, 0.08) 0%, transparent 35%, transparent 70%, rgba(255, 255, 255, 0.04) 100%);
}

/* marching horde under the hero */
.horde {
  display: flex; gap: 12px; justify-content: center; align-items: flex-end; flex-wrap: wrap;
  margin: 34px auto 0; min-height: 128px;
  padding: 0 0 8px;
  border-bottom: var(--px) dashed var(--slate);
  max-width: 960px;
}
.sprite {
  image-rendering: pixelated;
  background-repeat: no-repeat;
  display: inline-block;
}
/* 4-frame strips: each frame is one element width, so the animation steps in pixel multiples of it. */
.sprite.shambler { width: 96px; height: 128px; background-image: url("assets/sprites/shambler_walk_strip.png"); background-size: 384px 128px; animation: walk96 0.7s steps(4) infinite; }
.sprite.runner   { width: 96px; height: 128px; background-image: url("assets/sprites/runner_walk_strip.png");   background-size: 384px 128px; animation: walk96 0.45s steps(4) infinite; }
.sprite.boomer   { width: 96px; height: 128px; background-image: url("assets/sprites/boomer_walk_strip.png");   background-size: 384px 128px; animation: walk96 0.9s steps(4) infinite; }
.sprite.hunter   { width: 96px; height: 128px; background-image: url("assets/sprites/hunter_walk_strip.png");   background-size: 384px 128px; animation: walk96 0.5s steps(4) infinite; }
.sprite.brute    { width: 160px; height: 224px; background-image: url("assets/sprites/brute_walk_strip.png");   background-size: 640px 224px; animation: walk160 1s steps(4) infinite; }
.sprite.survivor { width: 96px; height: 128px; background-size: 384px 128px; animation: walk96 0.6s steps(4) infinite; }
.sprite.medic    { background-image: url("assets/sprites/survivor_medic_walk_strip.png"); }
.sprite.gunner   { background-image: url("assets/sprites/survivor_gunner_walk_strip.png"); }
.sprite.scout    { background-image: url("assets/sprites/survivor_scout_walk_strip.png"); }
.sprite.engineer { background-image: url("assets/sprites/survivor_engineer_walk_strip.png"); }
.sprite.flip { transform: scaleX(-1); }
.sprite.static { animation: none; }
@keyframes walk96  { from { background-position: 0 0; } to { background-position: -384px 0; } }
@keyframes walk160 { from { background-position: 0 0; } to { background-position: -640px 0; } }
@media (prefers-reduced-motion: reduce) { .sprite { animation: none !important; } }

/* ---------- features ---------- */
.grid { display: grid; gap: 22px; }
.grid.four { grid-template-columns: repeat(4, 1fr); }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.feature .icon { width: 64px; height: 64px; margin-bottom: 12px; }
.feature p { font-size: 20px; color: var(--light-gray); }

/* ---------- gallery ---------- */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery a {
  display: block; border: var(--px) solid var(--black); box-shadow: 0 0 0 2px var(--slate);
  background: var(--black); transition: none; position: relative; overflow: hidden;
}
.gallery a:hover, .gallery a:focus-visible { box-shadow: 0 0 0 var(--px) var(--gold); outline: none; }
.gallery img { width: 100%; height: auto; aspect-ratio: 16 / 9; }
.gallery figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 6px 10px;
  background: rgba(0, 0, 0, 0.75); font-size: 18px; color: var(--light-gray);
}
.lightbox {
  position: fixed; inset: 0; z-index: 60; display: none; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, 0.9); padding: 20px;
}
.lightbox.open { display: flex; }
.lightbox img { max-width: min(960px, 96vw); max-height: 86vh; width: auto; height: auto; border: var(--px) solid var(--light-gray); box-shadow: 0 0 0 var(--px) var(--black); }
.lightbox button {
  position: absolute; top: 16px; right: 16px; font-family: var(--font-head); font-size: 12px;
  background: var(--red); color: var(--white); border: 0; padding: 12px 14px;
  box-shadow: 0 0 0 var(--px) var(--black); cursor: pointer;
}
.lightbox .cap { position: absolute; bottom: 18px; left: 0; right: 0; text-align: center; color: var(--light-gray); font-size: 20px; }

/* ---------- classes ---------- */
.class-card { display: grid; grid-template-columns: 96px 1fr; gap: 16px; align-items: start; }
.class-card .sprite { margin-top: -4px; }
.class-card h3 { display: flex; align-items: center; gap: 10px; }
.class-card h3 img { width: 32px; height: 32px; }
.class-card .stat { font-size: 20px; color: var(--light-gray); margin: 0; }
.class-card .stat b { color: var(--lime); font-weight: normal; }
.class-card .stat .ab { color: var(--gold); }
.medic-card { border-color: var(--red); }
.gunner-card { border-color: var(--gold); }
.scout-card { border-color: var(--sky); }
.engineer-card { border-color: var(--orange); }

/* ---------- infected ---------- */
.infected { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; align-items: end; }
.infected .card { text-align: center; padding: 14px 10px 16px; }
.infected .sprite { margin: 0 auto 10px; }
.infected h3 { font-size: 11px; color: var(--pink); }
.infected p { font-size: 18px; color: var(--light-gray); margin: 0; }

/* ---------- perks ---------- */
.perks { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.perk {
  display: inline-flex; align-items: center; gap: 10px; padding: 8px 12px;
  background: var(--navy-dark); border: 2px solid var(--slate); font-size: 19px; color: var(--light-gray);
}
.perk img { width: 32px; height: 32px; }

/* ---------- download ---------- */
#download .grid { margin-top: 10px; }
.dl-card { text-align: center; padding: 26px 20px 22px; }
.dl-card.primary { border-color: var(--green); }
.dl-card .os { font-family: var(--font-head); font-size: 14px; color: var(--white); text-shadow: 2px 2px 0 var(--black); margin-bottom: 8px; }
.dl-card .arch { color: var(--light-gray); font-size: 19px; margin-bottom: 18px; }
.dl-card .btn { width: 100%; }
.dl-card .meta { margin: 14px 0 0; font-size: 19px; color: var(--light-gray); }
.dl-card .first { margin-top: 12px; font-size: 18px; color: var(--peach); text-align: left; }
.dl-card .badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--gold); color: var(--black); font-family: var(--font-head); font-size: 9px; padding: 6px 10px;
  box-shadow: 0 0 0 2px var(--black);
}
.req { margin-top: 26px; font-size: 20px; }
.req ul { margin: 8px 0 0; padding-left: 22px; }

/* ---------- steps / friends ---------- */
.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.steps li { display: grid; grid-template-columns: 48px 1fr; gap: 14px; align-items: start; }
.steps li::before {
  counter-increment: step; content: counter(step);
  font-family: var(--font-head); font-size: 14px; color: var(--black); background: var(--gold);
  width: 48px; height: 48px; display: grid; place-items: center; box-shadow: 0 0 0 var(--px) var(--black);
}
.callout { border-color: var(--gold); }

/* ---------- controls ---------- */
table { width: 100%; border-collapse: collapse; font-size: 21px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 2px solid var(--slate); }
th { font-family: var(--font-head); font-size: 10px; color: var(--gold); }
.kbd {
  display: inline-block; font-size: 10px; background: var(--light-gray); color: var(--black);
  padding: 6px 8px; margin: 2px 4px 2px 0; box-shadow: 0 2px 0 var(--black), 0 0 0 2px var(--black);
}

/* ---------- faq ---------- */
details { border: 2px solid var(--slate); background: var(--navy-dark); margin-bottom: 10px; }
summary { cursor: pointer; padding: 12px 16px; font-family: var(--font-head); font-size: 11px; line-height: 1.6; color: var(--white); list-style: none; }
summary::before { content: "> "; color: var(--lime); }
details[open] summary::before { content: "v "; }
details p { padding: 0 16px 14px; margin: 0; color: var(--light-gray); }

/* ---------- footer ---------- */
footer { border-top: var(--px) solid var(--black); background: var(--black); padding: 36px 0 60px; color: var(--light-gray); font-size: 19px; }
footer .wrap { display: grid; gap: 10px; text-align: center; }
footer .sprite { margin: 0 auto 8px; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .grid.four { grid-template-columns: repeat(2, 1fr); }
  .infected { grid-template-columns: repeat(3, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .sprite.brute { display: none; }
}
@media (max-width: 640px) {
  body { font-size: 20px; }
  .grid.four, .grid.three, .grid.two { grid-template-columns: 1fr; }
  .infected { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: 1fr; }
  .hero .lead { font-size: 22px; }
  .class-card { grid-template-columns: 72px 1fr; }
  .nav ul { margin-left: 0; }
  .horde .sprite.runner, .horde .sprite.hunter { display: none; }
  h2 { font-size: 15px; }
  table { font-size: 18px; }
  .kbd { font-size: 9px; }
}