:root {
  --surface: #f4f4f5;
  --paper: #ffffff;
  --ink: #1a1c1d;
  --primary: #48474f;
  --secondary: #64636d;
  --pattern: #71717a;
  --line: #e2e2e6;
  --quiet: #efeff1;
  --max: 1072px;
  --gutter: clamp(18px, 4vw, 48px);
  --section: clamp(64px, 8vw, 112px);
}
* { box-sizing: border-box; }
html { color-scheme: light; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--surface);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.55;
}
a { color: inherit; text-underline-offset: 3px; }
a:hover { color: var(--primary); }
button, a { touch-action: manipulation; }
button { font: inherit; }
:focus-visible { outline: 3px solid #56545f; outline-offset: 4px; }
.skip-link { position: fixed; left: 12px; top: -60px; z-index: 100; padding: 10px 14px; background: var(--ink); color: #fff; }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 20; height: 64px; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.97); }
.header-inner, .footer-inner { width: min(var(--max), calc(100% - 2 * var(--gutter))); height: 100%; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { font-size: 25px; line-height: 1; font-weight: 700; text-decoration: none; letter-spacing: -.02em; color: var(--primary); }
.site-nav, .footer-nav { display: flex; flex-wrap: wrap; align-items: center; gap: clamp(18px, 3vw, 34px); font-size: 14px; color: var(--secondary); }
.site-nav a[aria-current="page"] { color: var(--ink); font-weight: 700; }
.hero { width: min(var(--max), calc(100% - 2 * var(--gutter))); margin: 0 auto; padding: clamp(82px, 11vw, 122px) 0 48px; text-align: center; }
.hero h1, .page-hero h1 { max-width: 850px; margin: 0 auto 26px; font-size: clamp(2.35rem, 5.2vw, 3.7rem); line-height: 1.02; letter-spacing: -.035em; }
.hero p, .page-hero p { max-width: 680px; margin: 0 auto 28px; color: var(--secondary); font-size: 1.05rem; }
.btn { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; border: 1px solid var(--primary); padding: 11px 30px; background: var(--primary); color: #fff; text-decoration: none; cursor: pointer; }
.btn:hover { background: #34333a; color: #fff; }
.btn-secondary { background: transparent; color: var(--primary); border-color: var(--line); }
.btn-secondary:hover { background: var(--quiet); color: var(--ink); }
.btn:disabled { cursor: not-allowed; opacity: .52; }
.puzzle-wrap { width: min(480px, calc(100% - 2 * var(--gutter))); margin: 0 auto var(--section); }
.puzzle-card { padding: clamp(24px, 5vw, 48px); border: 1px solid var(--line); background: var(--paper); }
.state-row { min-height: 30px; margin-bottom: 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.state-cue { font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--secondary); }
.info-mark { color: #9998a1; font-size: 15px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.cell { position: relative; aspect-ratio: 1; min-width: 0; border: 1px solid var(--line); background-color: #fff; }
button.cell { padding: 0; cursor: pointer; }
button.cell:hover { border-color: #aaa9b0; }
.cell.selected { border: 3px solid var(--primary); }
.cell.empty { background-image: none; background-color: #fafafa; }
.cell.empty::after { content: ""; position: absolute; inset: 9px; border: 1px dashed #d6d5da; }
.swatch { background-size: 20px 20px; image-rendering: pixelated; }
.swatch-1 { background-image: radial-gradient(var(--pattern) 1px, transparent 1.5px); }
.swatch-2 { background-image: linear-gradient(45deg, var(--pattern) 25%, transparent 25%, transparent 50%, var(--pattern) 50%, var(--pattern) 75%, transparent 75%, transparent); background-size: 10px 10px; }
.swatch-3 { background-image: repeating-linear-gradient(0deg, var(--pattern), var(--pattern) 1px, transparent 1px, transparent 4px); }
.swatch-4 { background-image: repeating-linear-gradient(90deg, var(--pattern), var(--pattern) 1px, transparent 1px, transparent 4px); }
.swatch-5 { background-image: conic-gradient(from 0deg at 50% 50%, var(--pattern) 0 25%, transparent 25% 100%); background-size: 15px 15px; }
.swatch-6 { background-image: linear-gradient(to right, var(--pattern) 2px, transparent 2px), linear-gradient(to bottom, var(--pattern) 2px, transparent 2px); background-size: 8px 8px; }
.swatch-7 { background-image: radial-gradient(circle at center, var(--pattern) 4px, transparent 5px); background-size: 12px 12px; }
.swatch-8 { background-image: linear-gradient(-45deg, transparent 45%, var(--pattern) 45%, var(--pattern) 55%, transparent 55%); background-size: 6px 6px; }
.swatch-9 { background-image: conic-gradient(var(--pattern) 25%, transparent 0 50%, var(--pattern) 0 75%, transparent 0); background-size: 20px 20px; }
.tray { display: grid; grid-template-columns: repeat(9, 1fr); gap: 6px; margin-top: 20px; }
.tray .cell { aspect-ratio: 1; }
.tray .cell[aria-pressed="true"] { box-shadow: 0 0 0 3px var(--primary); }
.tray .cell:disabled { opacity: .22; cursor: default; }
.actions { margin-top: 32px; padding-top: 32px; border-top: 1px solid var(--line); text-align: center; }
.actions .btn + .btn { margin-left: 10px; }
.status-detail { min-height: 25px; margin: 18px 0 0; color: var(--secondary); font-size: 14px; }
.content-band { padding: var(--section) 0; background: #fff; }
.content-stack { width: min(var(--max), calc(100% - 2 * var(--gutter))); margin: 0 auto; display: grid; gap: clamp(58px, 7vw, 88px); }
.copy-block { max-width: 790px; }
.eyebrow { display: block; margin-bottom: 10px; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .14em; color: var(--secondary); }
.copy-block h2, .step h2, .policy-card h2 { margin: 0 0 14px; font-size: clamp(1.65rem, 3vw, 2.15rem); line-height: 1.2; letter-spacing: -.02em; }
.copy-block p, .step p, .policy-card p { margin: 0; color: var(--secondary); font-size: 1.02rem; }
.steps { margin: 20px 0 0; padding: 0; list-style: none; display: grid; gap: 16px; color: var(--secondary); }
.steps li { display: flex; gap: 18px; }
.steps strong { color: var(--primary); }
.faq { border-top: 1px solid var(--line); }
.faq details { padding: 22px 0; border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 700; }
.faq p { margin: 12px 0 0; max-width: 760px; color: var(--secondary); }
.page-hero { width: min(900px, calc(100% - 2 * var(--gutter))); margin: 0 auto; padding: clamp(82px, 10vw, 118px) 0 58px; text-align: center; }
.page-body { width: min(900px, calc(100% - 2 * var(--gutter))); margin: 0 auto; padding: 0 0 var(--section); }
.step-list { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.step { padding: clamp(28px, 5vw, 46px); background: #fff; }
.boundary { margin-top: 42px; padding: clamp(28px, 5vw, 46px); border-left: 5px solid var(--primary); background: #fff; }
.status-banner { margin: 0 auto 42px; padding: 20px 24px; border: 1px solid var(--primary); background: #fff; color: var(--primary); font-weight: 700; text-align: center; }
.policy-grid { display: grid; gap: 22px; }
.policy-card { padding: clamp(28px, 5vw, 44px); border: 1px solid var(--line); background: #fff; }
.link-row { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 12px; }
.site-footer { min-height: 130px; border-top: 1px solid var(--line); background: #fff; }
.site-footer .footer-inner { min-height: 130px; }
.copyright { color: var(--secondary); font-size: 13px; }
[hidden] { display: none !important; }
@media (max-width: 680px) {
  .site-header { height: auto; min-height: 64px; }
  .header-inner { padding: 14px 0; align-items: center; gap: 12px; }
  .brand { display: inline-flex; min-width: 44px; min-height: 44px; flex: 0 0 auto; align-items: center; }
  .brand:focus { outline: 3px solid #56545f; outline-offset: 4px; box-shadow: 0 0 0 3px #56545f; }
  .site-nav { display: grid; width: min(196px, calc(100% - 120px)); grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px 8px; }
  .site-nav a, .footer-nav a { display: inline-flex; min-width: 44px; min-height: 44px; padding: 10px 4px; align-items: center; justify-content: center; }
  .faq summary { display: flex; min-width: 44px; min-height: 44px; align-items: center; }
  .hero { padding-top: 44px; }
  .hero h1, .page-hero h1 { font-size: clamp(2.1rem, 11vw, 3rem); }
  .puzzle-card { padding: 22px; }
  .grid { gap: 8px; }
  .tray { grid-template-columns: repeat(5, 1fr); }
  .site-footer .footer-inner { padding: 26px 0; flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: no-preference) {
  .cell, .btn { transition: border-color .15s ease, background-color .15s ease, opacity .15s ease, transform .15s ease; }
  button.cell:active, .btn:active { transform: scale(.98); }
}