:root { --page-bg: #07090b; --text: #f4f5f2; --muted: #a5aca7; --accent: #c7ff5e; --panel: #11151a; --border: #ffffff20; --overlay: #11151ae6; --veil: #0b0d1070; --button-text: #0b0d10; }
:root[data-mode="light"] { color-scheme: light; --page-bg: #f4f6f8; --text: #18212b; --muted: #526171; --accent: #426b0b; --panel: #ffffff; --border: #18212b26; --overlay: #fffffff0; --veil: #f4f6f870; --button-text: #ffffff; }
:root { color-scheme: dark; font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: var(--text); background: var(--page-bg); }
* { box-sizing: border-box; }
body { margin: 0; background: radial-gradient(ellipse at 80% 0%, #c7ff5e0a, transparent 45%); }
a { color: inherit; text-underline-offset: 4px; }
a:focus-visible, button:focus-visible, #game:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
.page { width: min(100% - 48px, 960px); margin-inline: auto; }
.header { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding-block: 28px; border-bottom: 1px solid var(--border); }
.brand { text-decoration: none; font-size: 24px; font-weight: 850; letter-spacing: -1.2px; }
.brand span { color: var(--accent); }
.brand small { font-size: 16px; font-weight: 500; color: var(--muted); }
.repo-link { text-decoration: none; font-size: 14px; }
.repo-link:hover, footer a:hover { color: var(--accent); }
.intro { padding-block: 36px 28px; }
.badge { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); font: 11px ui-monospace, monospace; letter-spacing: 1.5px; }
.intro p { margin: 14px 0 0; color: var(--muted); font-size: 17px; line-height: 1.5; }
.snake404__copy { gap: 15px; }
.snake404__eyebrow { font-size: clamp(5rem, 12vw, 8rem); }
.snake404__title { font-size: clamp(1.3rem, 3.4vw, 2rem); font-weight: 650; }
.snake404__stage { width: min(100%, var(--board-width, 960px)); height: auto; aspect-ratio: var(--board-ratio, 16 / 9); justify-self: center; border: 0; outline: 1px solid var(--border); }
.instructions { color: var(--muted); font-size: 12px; text-align: center; line-height: 1.9; margin: 18px 0 0; }
.instructions span { padding-inline: 7px; color: var(--accent); }
.about { margin-top: 48px; padding: 28px; border: 1px solid var(--border); border-radius: 20px; background: var(--panel); }
.about h2 { margin: 0; font-size: clamp(1.2rem, 3vw, 1.5rem); letter-spacing: -.5px; }
.about p { max-width: 650px; color: var(--muted); line-height: 1.7; font-size: 14px; }
.features { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 20px 0; list-style: none; }
.features li { padding: 7px 11px; border: 1px solid var(--border); border-radius: 6px; font-size: 11px; color: var(--text); }
.docs-link { color: var(--accent); font-size: 14px; font-weight: 600; }
footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; padding-block: 28px; font-size: 11px; color: var(--muted); }
footer a { text-decoration: none; }
.version { color: var(--accent); margin-left: 5px; }
.skip-link { position: absolute; top: -100px; left: 16px; padding: 12px; background: var(--accent); color: var(--page-bg); z-index: 10; }
.skip-link:focus { top: 12px; }
.notice { padding: 20px; border: 1px solid var(--accent); border-radius: 12px; }
@media (max-width: 480px) {
  .page { width: calc(100% - 32px); }
  .header { padding-block: 20px; }
  .intro { padding-block: 28px; }
  .repo-link { font-size: 12px; }
  .about { padding: 20px; margin-top: 32px; }
}

.snake404 { --snake404-bg: var(--page-bg); --snake404-panel: var(--panel); --snake404-border: var(--border); --snake404-text: var(--text); --snake404-muted: var(--muted); --snake404-accent: var(--accent); }
.snake404__overlay { background: var(--veil); }
.snake404__overlayCard { background: var(--overlay); }
.snake404__button { color: var(--button-text); }
.customizer { padding: 24px; margin-bottom: 36px; background: var(--panel); border: 1px solid var(--border); border-radius: 20px; }
.customizer h2 { margin: 0 0 20px; font-size: 20px; }
.settings { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.settings label { display: grid; gap: 8px; font-size: 13px; color: var(--muted); }
select { width: 100%; padding: 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--page-bg); color: var(--text); font: inherit; }
select:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.colors { display: flex; flex-wrap: wrap; gap: 12px 24px; border: 0; padding: 0; margin: 20px 0 0; }
.colors legend { padding: 0; margin-bottom: 12px; font-size: 13px; color: var(--muted); }
.colors label { display: flex; align-items: center; gap: 8px; font-size: 13px; }
input[type="color"] { width: 40px; height: 36px; padding: 3px; border: 1px solid var(--border); border-radius: 6px; background: var(--page-bg); cursor: pointer; }
.settings-hint { margin: 18px 0 0; font-size: 12px; line-height: 1.6; color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
@media (max-width: 600px) { .settings { grid-template-columns: 1fr; } .customizer { padding: 20px; } }
@media (max-width: 600px) {
  .snake404__overlay { padding: 8px; }
  .snake404__overlayCard { padding: 10px; }
  .snake404__overlayTitle { font-size: 1.1rem; margin-bottom: 4px; }
  .snake404__overlayText { font-size: 12px; }
  .snake404__button { margin-top: 8px; padding: 8px 14px; }
}