/* Backpass website. Colours and type follow the game (spec 9.1) and the browser prototype. */
:root {
  --pine: #22322D; --pine-2: #2C3E38; --felt: #3B514A;
  --tile: #4B6359; --tile-hi: #577062; --wall: #1B2622;
  --paper: #F3EBD8; --ink: #2A3A34; --chalk: #CFD9D2; --chalk-dim: #93A69D;
  --ok: #8FD6A8;
  --A: #E8A33D; --B: #CF4B5C; --C: #5BA3C9;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --disp: "Fraunces", Georgia, "Times New Roman", serif;
  --line: rgba(255, 255, 255, .09);
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0; background: var(--pine); color: var(--chalk);
  font-family: var(--sans); font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; min-height: 100dvh;
  display: flex; flex-direction: column;
}
a { color: var(--paper); text-underline-offset: 3px; }
a:hover { color: #fff; }
:focus-visible { outline: 2.5px solid var(--paper); outline-offset: 3px; border-radius: 6px; }

.wrap { width: 100%; max-width: 980px; margin: 0 auto; padding-inline: 22px; }

/* Header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; gap: 12px; padding-block: 16px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; margin-right: auto; }
.brand img { width: 34px; height: 34px; border-radius: 8px; }
.brand span { font-family: var(--disp); font-weight: 700; font-size: 22px; letter-spacing: -.015em; color: var(--paper); }
.nav { display: flex; gap: 6px; }
.nav a {
  font-size: 14px; font-weight: 600; text-decoration: none; color: var(--chalk-dim);
  padding: 6px 12px; border-radius: 999px; border: 1px solid transparent;
}
.nav a:hover { color: var(--paper); border-color: rgba(255, 255, 255, .2); }
.nav a[aria-current="page"] { background: var(--paper); color: var(--ink); }

main { flex: 1; }

/* Home hero */
.hero { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 48px; align-items: center; padding-block: 64px 48px; }
@media (max-width: 820px) { .hero { grid-template-columns: minmax(0, 1fr); gap: 36px; padding-block: 40px 32px; } }
.hero-icon { width: 96px; height: 96px; border-radius: 22px; box-shadow: 0 18px 40px -22px rgba(0, 0, 0, .9); }
h1 {
  font-family: var(--disp); font-weight: 700; color: var(--paper);
  font-size: clamp(40px, 7vw, 64px); line-height: 1.02; letter-spacing: -.025em; margin: 22px 0 12px;
}
.lede { font-size: 20px; color: var(--chalk); margin: 0 0 24px; max-width: 34ch; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; background: var(--paper); color: var(--ink);
  font-weight: 700; font-size: 15px; padding: 10px 18px; border-radius: 12px;
}
.badge-note { display: block; margin-top: 12px; font-size: 14px; color: var(--chalk-dim); }

/* The little board, drawn like the game */
.board {
  --t: clamp(58px, 11vw, 82px);
  position: relative; background: var(--felt); border-radius: 18px; padding: 10px; margin-inline: auto;
  width: calc(var(--t) * 4 + 20px); height: calc(var(--t) * 3 + 20px);
  box-shadow: inset 0 2px 0 rgba(255, 255, 255, .06), 0 24px 50px -24px rgba(0, 0, 0, .9);
}
.board .cell {
  position: absolute; width: calc(var(--t) - 6px); height: calc(var(--t) - 6px);
  left: calc(10px + var(--t) * var(--x) + 3px); top: calc(10px + var(--t) * var(--y) + 3px);
  border-radius: 12px; background: var(--tile);
  box-shadow: inset 0 2px 0 var(--tile-hi), inset 0 -2px 0 rgba(0, 0, 0, .16);
}
.board .cell.wall { background: var(--wall); box-shadow: inset 0 2px 0 rgba(255, 255, 255, .05); }
.board .home {
  position: absolute; width: calc(var(--t) * .86); height: calc(var(--t) * .86);
  left: calc(10px + var(--t) * var(--x) + var(--t) * .07); top: calc(10px + var(--t) * var(--y) + var(--t) * .07);
  border: 3px solid currentColor; border-radius: 13px; opacity: .8;
  background: color-mix(in srgb, currentColor 12%, transparent);
  font-family: var(--disp); font-weight: 700; font-size: calc(var(--t) * .22);
}
.board .home span { position: absolute; top: 0; right: 5px; line-height: 1.15; }
.board .ghost {
  position: absolute; width: calc(var(--t) - 18px); height: calc(var(--t) - 18px);
  left: calc(10px + var(--t) * var(--x) + 9px); top: calc(10px + var(--t) * var(--y) + 9px);
  border: 2.5px dashed var(--paper); border-radius: 12px; opacity: .9;
}
.board .ch {
  position: absolute; width: calc(var(--t) * .62); height: calc(var(--t) * .62);
  left: calc(10px + var(--t) * var(--x) + var(--t) * .19); top: calc(10px + var(--t) * var(--y) + var(--t) * .19);
  border-radius: 50%; background: currentColor;
  box-shadow: inset 0 -4px 0 rgba(0, 0, 0, .2), inset 0 3px 0 rgba(255, 255, 255, .3), 0 4px 10px -3px rgba(0, 0, 0, .5);
}
.board .ch svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.board .ch b {
  position: absolute; top: -3px; left: -4px; width: 40%; height: 40%; border-radius: 50%;
  background: var(--paper); color: var(--ink); display: grid; place-items: center;
  font-size: calc(var(--t) * .16); box-shadow: 0 1px 4px rgba(0, 0, 0, .5);
}
.board .ch.picked { box-shadow: inset 0 -4px 0 rgba(0, 0, 0, .2), inset 0 3px 0 rgba(255, 255, 255, .3), 0 0 0 4px rgba(243, 235, 216, .9); }
.board .stub {
  position: absolute; left: calc(10px + var(--t) * var(--x) + var(--t) * .5); top: calc(10px + var(--t) * var(--y) + var(--t) * .7);
  transform: translateX(-50%); background: var(--paper); color: var(--ink); border-radius: 6px;
  padding: 2px 7px 3px; text-align: center; white-space: nowrap; box-shadow: 0 2px 7px -1px rgba(0, 0, 0, .6);
}
.board .stub i { display: block; font-style: normal; font-size: 14px; line-height: 1.05; letter-spacing: 1.5px; font-weight: 600; }
.board .stub small { display: block; font-size: 9.5px; font-weight: 700; opacity: .76; line-height: 1.1; }
.board-caption {
  margin: 18px auto 0; max-width: 420px; background: var(--pine-2); border: 1px solid rgba(255, 255, 255, .11);
  border-radius: 11px; padding: 12px 15px; font-size: 14.5px;
}
.board-caption strong { font-family: var(--disp); color: var(--paper); margin-right: 6px; }

/* Sections and cards */
.section { padding-block: 32px; }
.section h2 { font-family: var(--disp); font-weight: 700; font-size: 30px; color: var(--paper); letter-spacing: -.015em; margin: 0 0 18px; }
.rules { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 820px) { .rules { grid-template-columns: minmax(0, 1fr); } }
.card { background: var(--pine-2); border: 1px solid rgba(255, 255, 255, .1); border-radius: 14px; padding: 18px 20px; }
.card h3 { margin: 0 0 6px; font-size: 16px; color: var(--paper); }
.card p { margin: 0; font-size: 15px; color: var(--chalk); }
.num {
  display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  background: var(--paper); color: var(--ink); font-weight: 700; font-size: 13px; margin-bottom: 10px;
}
.key {
  background: rgba(243, 235, 216, .14); border: 1px solid rgba(243, 235, 216, .28); border-radius: 4px;
  padding: 0 5px; font-weight: 600; color: var(--paper); white-space: nowrap;
}

/* Long-form pages (privacy, support) */
.page { padding-block: 48px 64px; max-width: 720px; }
.page h1 { font-size: clamp(36px, 6vw, 48px); margin-top: 0; }
.page .meta { color: var(--chalk-dim); font-size: 14px; margin: -4px 0 28px; }
.page h2 { font-family: var(--disp); font-weight: 700; font-size: 24px; color: var(--paper); margin: 36px 0 10px; letter-spacing: -.01em; }
.page p, .page li { color: var(--chalk); }
.page ul { padding-left: 20px; }
.page li { margin-bottom: 6px; }
.callout { background: var(--pine-2); border: 1px solid rgba(255, 255, 255, .11); border-radius: 11px; padding: 14px 18px; margin: 0 0 8px; }
.callout p { margin: 0; }
details { border-top: 1px solid var(--line); padding-block: 14px; }
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; color: var(--paper); list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::before { content: "+ "; color: var(--chalk-dim); }
details[open] summary::before { content: "– "; }
details p { margin: 10px 0 0; }

/* 404: a lost character, a wall, and an empty doorway */
.lost .eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: var(--chalk-dim); border: 1px solid rgba(255, 255, 255, .16); border-radius: 999px; padding: 4px 12px;
}
.lost h1 { margin-top: 18px; }
.lost .board { --t: clamp(66px, 13vw, 96px); }
.lost .board .stub { top: calc(10px + var(--t) * var(--y) + var(--t) * .8); }
.lost-links { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; }
a.badge { text-decoration: none; }
a.badge:hover { color: var(--ink); background: #fff; }
.board .home.empty { border-style: dashed; opacity: .55; }
.board .huh {
  position: absolute; left: calc(10px + var(--t) * var(--x) + var(--t) * .66); top: calc(10px + var(--t) * var(--y) - var(--t) * .06);
  width: calc(var(--t) * .34); height: calc(var(--t) * .34); border-radius: 50%;
  background: var(--paper); color: var(--ink); display: grid; place-items: center;
  font-family: var(--disp); font-weight: 700; font-size: calc(var(--t) * .24); line-height: 1;
  box-shadow: 0 2px 7px -1px rgba(0, 0, 0, .6); animation: huh 2.8s ease-in-out infinite;
}
.board .ch .look { animation: look 4s ease-in-out infinite; }
.board .ch.lost-ch { animation: fidget 4s ease-in-out infinite; }
@keyframes huh { 0%, 100% { transform: translateY(0) rotate(-8deg); } 50% { transform: translateY(-4px) rotate(8deg); } }
@keyframes look { 0%, 20% { transform: translateX(0); } 30%, 50% { transform: translateX(-5px); } 60%, 80% { transform: translateX(5px); } 90%, 100% { transform: translateX(0); } }
@keyframes fidget { 0%, 45%, 100% { rotate: 0deg; } 55% { rotate: -5deg; } 65% { rotate: 4deg; } 75% { rotate: 0deg; } }

/* Footer */
.site-footer { border-top: 1px solid var(--line); margin-top: 24px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 20px; padding-block: 22px; font-size: 14px; color: var(--chalk-dim); }
.site-footer .wrap > :first-child { margin-right: auto; }
.site-footer a { color: var(--chalk-dim); }
.site-footer a:hover { color: var(--paper); }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }