/*
 * keicoin.org
 *
 * Two audiences, two shapes, one set of facts (SPEC §11.5):
 *
 *   A human gets this — a landing page, and it should be good.
 *   An agent gets /llms.txt and /AGENTS.md, which are the datasheet.
 *
 * The look is built from the one visual thing this project owns: a steel
 * button with a green dome, on a pole, in a dark room — so the hero is the
 * photographed object itself, pressable, counting up, teaching the entire
 * product in one gesture.
 *
 * Green is the dome's actual color, not the site's. It is used only where the
 * copy is literally talking about the chain — the hero's "on a chain," the
 * live press count, the "on Kei" outcome column. Everywhere else — links,
 * labels, the primary button, focus states — is the amber of an indicator
 * lamp on the same button housing, because a page that is green from the logo
 * to the footer reads as a template with the brand color turned up, not a
 * product with one.
 *
 * Type is a system stack, deliberately: this is on Cloudflare and the whole page
 * should paint before a webfont could have finished a handshake. Weight and
 * scale carry the personality instead of a novelty face.
 */

:root {
  --void: #0a0a0b;
  --world: #101113;
  --raised: #191b1d;
  --ink: #ecebe7;
  --ink-dim: #98999a;
  --ink-faint: #626466;
  --rule: #2a2c2e;

  /* The steel of the button's own housing — the site's real primary. */
  --steel: #9a9d97;
  --steel-deep: #55585a;

  /* The indicator-lamp amber — the interactive accent. */
  --amber: #dc9f4d;
  --amber-bright: #f0c076;
  --amber-ink: #2b1c08;

  /* The dome's actual green, used only when the copy means the chain. */
  --green: #1aa851;
  --green-bright: #3fcf74;
  --green-deep: #0d3f24;

  --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.85);

  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "JetBrains Mono", Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--world);
  color: var(--ink);
  font: 400 17px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 28px; }
.narrow { max-width: 72ch; }

/* ------------------------------------------------------------------ header */

header.site {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(16, 17, 19, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

header.site .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 24px;
  padding-top: 14px;
  padding-bottom: 14px;
}

header.site a {
  font: 500 13.5px/1 var(--mono);
  color: var(--ink-dim);
  text-decoration: none;
}

header.site a:hover { color: var(--ink); }

header.site .home {
  margin-right: auto;
  color: var(--ink);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
}

header.site .home b { color: var(--amber); font-weight: 700; }

/* -------------------------------------------------------------------- hero */

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(120% 90% at 68% 18%, #1a1712 0%, var(--world) 58%, var(--void) 100%);
}

.hero .wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 56px;
  align-items: center;
  padding-top: 84px;
  padding-bottom: 84px;
}

@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 44px; padding-top: 56px; padding-bottom: 56px; }
}

.hero h1 {
  font: 800 clamp(38px, 6vw, 62px)/1.04 var(--sans);
  letter-spacing: -0.035em;
  margin: 0 0 20px;
}

.hero h1 em { font-style: normal; color: var(--green); }

.hero .sub {
  font-size: 20px;
  line-height: 1.5;
  color: var(--ink-dim);
  margin: 0 0 30px;
  max-width: 46ch;
}

.hero .sub b { color: var(--ink); font-weight: 600; }

.cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.button-link {
  display: inline-block;
  font: 600 15px/1 var(--sans);
  text-decoration: none;
  padding: 14px 22px;
  border-radius: 7px;
  border: 1px solid transparent;
  transition: transform 0.12s ease, background 0.12s ease;
}

.button-link.primary { background: var(--amber); color: var(--amber-ink); }
.button-link.primary:hover { background: var(--amber-bright); transform: translateY(-1px); }

/* -------------------------------------------------------------- install picker */

.install { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }

.install-tabs { display: flex; gap: 4px; }

.install-tab {
  font: 600 12px/1 var(--mono);
  letter-spacing: 0.02em;
  color: var(--ink-faint);
  background: none;
  border: 1px solid transparent;
  border-radius: 5px;
  padding: 5px 9px;
  cursor: pointer;
}

.install-tab:hover { color: var(--ink-dim); }
.install-tab.active { color: var(--amber); background: var(--raised); border-color: var(--rule); }

.install-cmd {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  font: 600 14px/1 var(--mono);
  color: var(--ink);
  background: var(--raised);
  border: 1px solid var(--steel-deep);
  border-radius: 7px;
  padding: 14px 22px;
  cursor: pointer;
  text-align: left;
  overflow: hidden;
}

.install-cmd:hover { border-color: var(--amber); }
.install-cmd:hover .install-text { color: var(--amber); }

.install-cmd::after {
  content: 'copy';
  margin-left: auto;
  font: 500 10.5px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.install-cmd:hover::after { color: var(--amber); }

.install-copied {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--raised);
  color: var(--green-bright);
  font: 600 13px/1 var(--mono);
  opacity: 0;
  transition: opacity 0.15s ease;
  pointer-events: none;
}

.install-cmd.copied .install-copied { opacity: 1; }

.install-link {
  font: 500 12.5px/1 var(--mono);
  color: var(--ink-faint);
  text-decoration: none;
}

.install-link:hover { color: var(--amber); }

/* --------------------------------------------------------- the real button */

.press {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  user-select: none;
}

.press-readout {
  font: 700 15px/1 var(--mono);
  letter-spacing: 0.02em;
  color: var(--ink-dim);
  background: var(--raised);
  border: 1px solid var(--steel-deep);
  border-radius: 6px;
  padding: 12px 18px;
  min-width: 230px;
  text-align: center;
}

.press-readout b { color: var(--amber); font-size: 21px; }
.press-readout span { display: block; margin-top: 6px; font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); }

/* The actual photographed button from the demo, not a redrawn one. */
.press-rig { position: relative; width: 220px; height: 220px; }

.press-cap {
  position: absolute;
  inset: 0;
  border: 0;
  padding: 0;
  cursor: pointer;
  background: none;
  filter: drop-shadow(0 18px 26px rgba(0, 0, 0, 0.55));
  transition: transform 0.09s ease;
}

.press-cap:active { transform: translateY(5px); }
.press-cap.down { transform: translateY(5px); }

.press-img { display: block; width: 100%; height: 100%; object-fit: contain; }

.pop {
  position: absolute;
  left: 50%;
  top: -6px;
  font: 700 22px/1 var(--mono);
  color: var(--amber);
  pointer-events: none;
  animation: rise 0.75s ease-out forwards;
}

@keyframes rise {
  from { opacity: 1; transform: translate(-50%, 0); }
  to { opacity: 0; transform: translate(-50%, -46px); }
}

.press-hint { font: 400 13px/1.5 var(--mono); color: var(--ink-faint); text-align: center; }

/* ---------------------------------------------------------------- sections */

section { padding: 80px 0; border-bottom: 1px solid var(--rule); }
section.tight { padding: 56px 0; }

.eyebrow {
  font: 600 11.5px/1 var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 16px;
}

h2 {
  font: 700 clamp(26px, 3.4vw, 36px)/1.15 var(--sans);
  letter-spacing: -0.025em;
  margin: 0 0 18px;
}

h3 { font: 600 18px/1.35 var(--sans); letter-spacing: -0.01em; margin: 32px 0 10px; }

p { margin: 0 0 18px; max-width: 68ch; }
.dim { color: var(--ink-dim); }

a { color: var(--amber); text-underline-offset: 3px; }
a:hover { color: var(--amber-bright); }

ul, ol { margin: 0 0 18px; padding-left: 22px; max-width: 68ch; }
li { margin-bottom: 8px; }

code {
  font: 500 0.88em/1 var(--mono);
  background: var(--raised);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 2px 6px;
}

/* ------------------------------------------------------------ before/after */

.swap-table { width: 100%; border-collapse: collapse; margin-bottom: 8px; }

.swap-table th, .swap-table td {
  text-align: left;
  vertical-align: top;
  padding: 14px 18px 14px 0;
  border-bottom: 1px solid var(--rule);
}

.swap-table th {
  font: 600 11.5px/1.4 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.swap-table td:first-child { font-weight: 600; }
.swap-table td:nth-child(2) { color: var(--ink-dim); }
/* The "on Kei" column is what actually happens on-chain — the one place
   outside the button itself where the dome's green earns its keep. */
.swap-table td:last-child { color: var(--green); font-family: var(--mono); font-size: 14.5px; }

/* ------------------------------------------------------------------- code */

.panes { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 820px) { .panes { grid-template-columns: 1fr; } }

figure.code {
  margin: 0 0 22px;
  border: 1px solid var(--rule);
  border-radius: 9px;
  background: var(--void);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.panes figure.code { margin: 0; }

figure.code figcaption {
  font: 600 11.5px/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 13px 16px;
  border-bottom: 1px solid var(--rule);
}

figure.code pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  font: 400 13.5px/1.7 var(--mono);
  color: #d6d5d1;
}

figure.code code { background: none; border: 0; padding: 0; font-size: inherit; }
figure.code .c { color: var(--ink-faint); }
figure.code .k { color: var(--green); }
figure.code .s { color: #d8c07a; }

/* --------------------------------------------------------------- use cases */

.jobs { display: grid; gap: 0; margin-top: 8px; }

.jobs a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: var(--ink);
}

.jobs a:first-child { border-top: 1px solid var(--rule); }
.jobs a:hover { color: var(--amber); }
.jobs a:hover .arrow { transform: translateX(4px); }

.jobs .ask { font: 600 18px/1.35 var(--sans); letter-spacing: -0.015em; }
.jobs .ask q { quotes: '“' '”'; }
.jobs .what { display: block; margin-top: 5px; font: 400 15px/1.5 var(--sans); color: var(--ink-dim); }
.jobs .arrow { color: var(--amber); font: 500 15px/1 var(--mono); transition: transform 0.12s ease; }

/* ----------------------------------------------------------------- limits */

.limits {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--amber);
  border-radius: 0 9px 9px 0;
  padding: 22px 24px;
  margin: 0 0 22px;
  background: var(--raised);
}

.limits h4 {
  font: 600 12.5px/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 14px;
}

.limits ul { margin: 0; padding-left: 20px; }
.limits li { color: var(--ink-dim); }
.limits li:last-child { margin-bottom: 0; }
.limits strong { color: var(--ink); }

/* ------------------------------------------------------------- sub-pages */

.page { padding: 64px 0 40px; }

.page h1 {
  font: 800 clamp(32px, 5vw, 48px)/1.08 var(--sans);
  letter-spacing: -0.03em;
  margin: 0 0 18px;
}

.lede { font-size: 20px; line-height: 1.5; color: var(--ink-dim); max-width: 62ch; }
.lede b, .lede strong { color: var(--ink); font-weight: 600; }

.page h2 {
  font-size: clamp(22px, 2.6vw, 27px);
  margin: 52px 0 14px;
  padding-top: 26px;
  border-top: 1px solid var(--rule);
}

.asks {
  border: 1px solid var(--rule);
  border-radius: 9px;
  background: var(--raised);
  padding: 18px 22px;
  margin: 30px 0 34px;
}

.asks p {
  margin: 0 0 12px;
  font: 600 11.5px/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.asks ul { margin: 0; padding: 0; list-style: none; }
.asks li { font: 500 15px/1.55 var(--sans); color: var(--ink); margin-bottom: 6px; }
.asks li::before { content: '“'; color: var(--amber); }
.asks li::after { content: '”'; color: var(--amber); }

.status-line {
  font: 500 13.5px/1.6 var(--mono);
  color: var(--ink-dim);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--amber);
  border-radius: 0 7px 7px 0;
  padding: 13px 17px;
  margin: 0 0 8px;
}

.status-line b { color: var(--ink); font-weight: 600; }

.scroll { overflow-x: auto; margin: 0 0 22px; }

table.data { border-collapse: collapse; width: 100%; min-width: 460px; font-size: 15.5px; }

table.data th, table.data td {
  text-align: left;
  vertical-align: top;
  padding: 11px 16px 11px 0;
  border-bottom: 1px solid var(--rule);
}

table.data th {
  font: 600 11.5px/1.4 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

table.data td:first-child { font-family: var(--mono); font-size: 14px; }

.next { margin-top: 44px; padding-top: 8px; }

.next a {
  display: block;
  font: 600 16px/1.4 var(--sans);
  text-decoration: none;
  color: var(--ink);
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}

.next a:first-child { border-top: 1px solid var(--rule); }
.next a:hover { color: var(--amber); }
.next a span { display: block; margin-top: 4px; font: 400 15px/1.5 var(--sans); color: var(--ink-dim); }
.next a::before { content: '→ '; color: var(--amber); }

/* ----------------------------------------------------------------- footer */

footer.site { padding: 40px 0 56px; }

footer.site p {
  font: 400 13.5px/1.8 var(--mono);
  color: var(--ink-faint);
  max-width: none;
  margin: 0;
}

footer.site a { color: var(--ink-dim); text-decoration-color: var(--rule); }
footer.site a:hover { color: var(--amber); }

/* ------------------------------------------------------------------- misc */

.skip { position: absolute; left: -9999px; }

.skip:focus {
  left: 28px;
  top: 12px;
  background: var(--amber);
  color: var(--amber-ink);
  padding: 9px 14px;
  font: 600 13px var(--mono);
  border-radius: 6px;
  z-index: 30;
}

:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }