:root {
  --tile: #f4f7f8;
  --blue: #1f6f8b;
  --ink: #1a2a30;
  --mute: #5b6d74;
  --display: "Public Sans", "Noto Sans SC", sans-serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 64px; }
body { margin: 0; background: var(--tile); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.7; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
label { display: block; font-size: 13px; color: var(--mute); margin: 8px 0; }
input[type="range"] { width: min(280px, 100%); accent-color: var(--blue); }
.tile-grain { pointer-events: none; position: fixed; inset: 0; z-index: 6; opacity: 0.14; background-image: url("images/texture.webp"); background-size: 240px auto; mix-blend-mode: multiply; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 80; background: var(--blue); color: #fff; padding: 8px; }
.kit-bar { position: sticky; top: 0; z-index: 40; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 20px; background: #fff; border-bottom: 3px solid var(--blue); }
.brand { font-family: var(--display); font-weight: 800; font-size: 20px; }
.brand small { display: block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; color: var(--mute); font-weight: 400; }
.nav-toggle { display: none; background: var(--blue); color: #fff; border: 0; padding: 6px 12px; font-weight: 700; }
.kit-links { display: flex; gap: 14px; font-size: 14px; flex-wrap: wrap; align-items: center; }
.kit-links a { color: var(--mute); }
.kit-links a.is-active, .kit-links a:hover { color: var(--blue); }
.kit-links .live { background: var(--blue); color: #fff; padding: 6px 12px; font-weight: 700; }
.kitchen { display: grid; grid-template-columns: 1.2fr 0.8fr; min-height: calc(100vh - 58px); }
.kitchen img { width: 100%; height: 100%; object-fit: cover; min-height: 100%; }
.copy { padding: 7vh 32px; background: #fff; }
.kicker { font-family: var(--mono); letter-spacing: 0.14em; font-size: 11px; color: var(--blue); margin: 0 0 10px; }
h1, h2, h3 { font-family: var(--display); margin: 0 0 12px; line-height: 1.15; }
h1 { font-size: clamp(28px, 4vw, 44px); }
h2 { font-size: clamp(22px, 2.8vw, 32px); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.btn { display: inline-flex; align-items: center; padding: 10px 16px; font-size: 14px; font-weight: 700; background: var(--blue); color: #fff; }
.btn.ghost { background: transparent; border: 1px solid var(--blue); color: var(--blue); }
.w { width: min(1000px, calc(100% - 40px)); margin: 0 auto; padding: 64px 0; }
.boards { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-top: 16px; }
.boards article { background: #fff; padding: 16px; border-top: 8px solid #e11d48; }
.boards article:nth-child(2) { border-top-color: #16a34a; }
.boards article:nth-child(3) { border-top-color: #2563eb; }
.boards ul { margin: 0; padding-left: 1.1em; }
.hold-box { background: #fff; padding: 18px; max-width: 28em; margin: 16px 0; box-shadow: inset 0 0 0 3px var(--blue); }
.hold-box.is-ok { box-shadow: inset 0 0 0 3px #16a34a; }
.n { font-family: var(--display); font-size: 48px; margin: 0; color: var(--blue); line-height: 1; }
.n span { font-size: 16px; color: var(--mute); }
#flow, #value { background: #e8eef1; }
#rules ol { background: #fff; padding: 16px 16px 16px 36px; border-left: 8px solid var(--blue); max-width: 46em; }
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.io > div { background: #fff; padding: 16px; }
.url { margin-top: 18px; font-family: var(--mono); font-size: 13px; }
footer { padding: 16px 20px 40px; color: var(--mute); font-size: 13px; }
@media (max-width: 900px) {
  .kitchen, .boards, .io { grid-template-columns: 1fr; }
  .kitchen img { min-height: 42vh; height: 42vh; }
  .nav-toggle { display: inline-block; }
  .kit-bar { flex-wrap: wrap; }
  .kit-links { display: none; width: 100%; flex-direction: column; padding: 8px 0; }
  .kit-links.open { display: flex; }
}