/* Same room as the app: charcoal, a green board, one green button per screen. */

:root {
  color-scheme: dark;
  --bg: #302e2b;
  --panel: #262522;
  --panel-2: #1f1e1c;
  --raise: #3b3936;
  --line: #3d3a36;
  --ink: #ffffff;
  --ink-2: #c3c2c0;
  --ink-3: #8b8987;
  --green: #81b64c;
  --green-hi: #95c95c;
  --green-edge: #537d34;
  --red: #e0584a;
  --sq-light: #ebecd0;
  --sq-dark: #739552;
  --font: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 800;
}

a {
  color: inherit;
}

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

/* ── Buttons ──────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px 13px;
  border-radius: 6px;
  background: var(--green);
  box-shadow: inset 0 -4px 0 var(--green-edge);
  color: #fff;
  font-weight: 800;
  text-decoration: none;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
  transition: background 0.12s ease;
}

.btn:hover {
  background: var(--green-hi);
}

.btn:active {
  transform: translateY(2px);
  box-shadow: inset 0 -2px 0 var(--green-edge);
}

.btn-sm {
  padding: 7px 16px 10px;
  font-size: 15px;
}

.btn-xl {
  min-width: 220px;
  padding: 18px 32px 22px;
  font-size: 22px;
  letter-spacing: -0.01em;
  border-radius: 8px;
}

.btn-quiet {
  background: var(--raise);
  box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.3);
  color: var(--ink-2);
  text-shadow: none;
}

.btn-quiet:hover {
  background: #45423e;
  color: #fff;
}

.btn-quiet:active {
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.3);
}

/* ── Nav ──────────────────────────────────────────────────────────────── */

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.brand svg {
  width: 32px;
  height: 32px;
  fill: var(--green);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 15px;
  font-weight: 700;
}

.nav-links a:not(.btn) {
  color: var(--ink-2);
  text-decoration: none;
}

.nav-links a:not(.btn):hover {
  color: #fff;
}

/* ── Hero ─────────────────────────────────────────────────────────────── */

.hero {
  max-width: 820px;
  margin: 0 auto;
  padding: 72px 24px 56px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(38px, 6.4vw, 66px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.lede {
  max-width: 34em;
  margin: 22px auto 0;
  color: var(--ink-2);
  font-size: clamp(17px, 2vw, 19px);
  text-wrap: pretty;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 36px;
}

.fine {
  margin: 18px 0 0;
  color: var(--ink-3);
  font-size: 14px;
}

/* ── Boards ───────────────────────────────────────────────────────────── */

.mini-board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  aspect-ratio: 1;
  width: 100%;
  border-radius: 4px;
  overflow: hidden;
  container-type: inline-size;
}

.mini-board > div {
  position: relative;
}

.mini-board .light {
  background: var(--sq-light);
}

.mini-board .dark {
  background: var(--sq-dark);
}

.mini-board .mark::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 51, 0.46);
}

.pc {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  stroke-width: 1.5;
  stroke-linejoin: round;
  stroke-linecap: round;
  filter: drop-shadow(0 1.5px 0 rgba(0, 0, 0, 0.18));
}

.pc.w {
  fill: #f9f9f7;
  stroke: #2c2a27;
}

.pc.b {
  fill: #3a3835;
  stroke: #121110;
}

.pc .detail {
  fill: none;
}

.pc.b .detail {
  stroke: #cfcdc8;
  stroke-width: 1.1;
}

.pc.w .eye {
  fill: #2c2a27;
  stroke: none;
}

.pc.b .eye {
  fill: #cfcdc8;
  stroke: none;
}

.mini-board .cf,
.mini-board .cr {
  position: absolute;
  font-size: 2.1cqi;
  font-weight: 700;
  line-height: 1;
}

.mini-board .cf {
  right: 5%;
  bottom: 4%;
}

.mini-board .cr {
  left: 5%;
  top: 4%;
}

.mini-board .light > .cf,
.mini-board .light > .cr {
  color: var(--sq-dark);
}

.mini-board .dark > .cf,
.mini-board .dark > .cr {
  color: var(--sq-light);
}

/* ── Showcase ─────────────────────────────────────────────────────────── */

.showcase {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.table {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 18px;
  padding: 18px;
  border-radius: 12px;
  background: var(--panel-2);
  box-shadow: 0 40px 80px -30px rgba(0, 0, 0, 0.7);
}

.board-col {
  display: grid;
  gap: 8px;
}

.bar {
  display: flex;
  align-items: center;
  gap: 10px;
}

.av {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 4px;
  background: #5d7a3c;
  font-size: 10px;
  font-weight: 800;
  flex: none;
}

.av-b {
  background: #6b5a8c;
}

.who {
  flex: 1;
  font-size: 14px;
  font-weight: 700;
}

.clk {
  min-width: 104px;
  padding: 5px 12px;
  border-radius: 5px;
  background: #21201d;
  color: rgba(255, 255, 255, 0.55);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.clk.is-live {
  background: #fff;
  color: #262522;
}

.panel {
  display: flex;
  flex-direction: column;
  border-radius: 8px;
  background: var(--panel);
  overflow: hidden;
}

.panel-status {
  margin: 0;
  padding: 16px;
  background: #1a1917;
  font-size: 18px;
  font-weight: 800;
  text-align: center;
}

.panel-moves {
  flex: 1;
  margin: 0;
  padding: 8px 0;
  list-style: none;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.panel-moves li {
  display: grid;
  grid-template-columns: 36px 1fr 1fr;
  padding: 4px 16px;
}

.panel-moves li:nth-child(even) {
  background: rgba(255, 255, 255, 0.025);
}

.panel-moves span {
  color: var(--ink-3);
}

.panel-moves b {
  font-weight: 600;
  color: var(--ink-2);
}

.panel-moves .now {
  color: var(--green-hi);
}

.panel-actions {
  display: flex;
  gap: 8px;
  padding: 14px 16px;
  border-top: 1px solid var(--line);
}

.ghost-btn {
  flex: 1;
  padding: 9px 0 11px;
  border-radius: 5px;
  background: var(--raise);
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.28);
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 700;
  text-align: center;
}

/* ── Sections ─────────────────────────────────────────────────────────── */

.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 120px 24px 0;
}

.section-title {
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

#how .section-title {
  text-align: center;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 48px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.step {
  display: flex;
  flex-direction: column;
  padding: 28px 28px 0 0;
}

.step + .step {
  padding-left: 28px;
  border-left: 1px solid var(--line);
}

.step-no {
  color: var(--green);
  font-size: 15px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.step h3 {
  margin-top: 6px;
  font-size: 21px;
  letter-spacing: -0.02em;
}

.step p {
  flex: 1;
  margin: 8px 0 22px;
  color: var(--ink-2);
  font-size: 15px;
}

.demo {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px;
  border-radius: 8px;
  background: var(--panel);
  font-size: 13px;
  font-weight: 700;
}

.demo-clocks span {
  flex: 1;
  padding: 8px 0;
  border: 2px solid transparent;
  border-radius: 5px;
  background: var(--raise);
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.demo-clocks .on {
  border-color: var(--green);
  background: #3a4430;
  color: var(--green-hi);
}

.demo-link .url {
  flex: 1;
  min-width: 0;
  padding: 8px 10px;
  border-radius: 5px;
  background: var(--panel-2);
  color: var(--ink-2);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.demo-link .copy {
  padding: 7px 12px 9px;
  border-radius: 5px;
  background: var(--green);
  box-shadow: inset 0 -3px 0 var(--green-edge);
}

.demo-result {
  gap: 12px;
  color: var(--ink-2);
  font-weight: 500;
}

.demo-result .res {
  width: 48px;
  padding: 4px 0;
  border-radius: 3px;
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  text-align: center;
  text-transform: uppercase;
}

.demo-result .win {
  background: var(--green);
}

.demo-result .when {
  margin-left: auto;
  color: var(--ink-3);
}

/* ── Rules + record ───────────────────────────────────────────────────── */

.split {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: center;
}

.split-copy p {
  margin: 18px 0 0;
  max-width: 36em;
  color: var(--ink-2);
}

.rules {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.rules li {
  position: relative;
  padding: 11px 0 11px 28px;
  border-top: 1px solid var(--line);
  font-weight: 600;
}

.rules li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 17px;
  width: 11px;
  height: 11px;
  background: var(--sq-dark);
  box-shadow: 4px 4px 0 -1px var(--sq-light);
}

.record-card {
  padding: 26px;
  border-radius: 12px;
  background: var(--panel);
}

.record-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.record-head .av {
  width: 46px;
  height: 46px;
  font-size: 12px;
}

.record-head strong {
  display: block;
  font-size: 18px;
}

.record-head span {
  color: var(--ink-3);
  font-size: 14px;
}

.record-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 22px;
}

.cell {
  display: grid;
  padding: 16px 8px 13px;
  border-radius: 6px;
  background: var(--panel-2);
  border-bottom: 3px solid;
  text-align: center;
}

.cell strong {
  font-size: 32px;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.cell span {
  color: var(--ink-3);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.cell.win {
  border-color: var(--green);
}

.cell.loss {
  border-color: var(--red);
}

.cell.draw {
  border-color: #7a7874;
}

.record-note {
  margin: 18px 0 0;
  color: var(--ink-3);
  font-size: 14px;
}

/* ── Closer ───────────────────────────────────────────────────────────── */

.closer {
  display: grid;
  justify-items: center;
  gap: 22px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 130px 24px 110px;
  text-align: center;
}

.mini-board-sm {
  width: 168px;
}

.closer h2 {
  font-size: clamp(34px, 5vw, 52px);
  letter-spacing: -0.035em;
}

/* ── Footer ───────────────────────────────────────────────────────────── */

.foot {
  display: flex;
  justify-content: space-between;
  max-width: 1080px;
  margin: 0 auto;
  padding: 22px 24px 34px;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 14px;
}

.foot a {
  color: var(--ink-2);
  font-weight: 700;
  text-decoration: none;
}

/* ── Narrow screens ───────────────────────────────────────────────────── */

@media (max-width: 860px) {
  .table {
    grid-template-columns: minmax(0, 1fr);
    padding: 12px;
  }

  .panel {
    display: none;
  }

  .steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .step,
  .step + .step {
    padding: 26px 0 30px;
    border-left: 0;
  }

  .step + .step {
    border-top: 1px solid var(--line);
  }

  .split {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }

  .section {
    padding-top: 88px;
  }
}

@media (max-width: 560px) {
  .nav {
    padding: 14px 16px;
  }

  .nav-links a:not(.btn) {
    display: none;
  }

  .hero {
    padding: 48px 16px 44px;
  }

  .hero-ctas .btn {
    width: 100%;
  }

  .showcase,
  .section,
  .closer,
  .foot {
    padding-left: 16px;
    padding-right: 16px;
  }

  .clk {
    min-width: 84px;
    font-size: 17px;
  }
}