:root {
  --bg: #ebe6d8;
  --text: #111512;
  --muted: rgba(17, 21, 18, 0.64);
  --panel: rgba(255, 252, 245, 0.8);
  --accent: #b8ff52;
  --accent-dark: #18300d;
  --line: rgba(17, 21, 18, 0.1);
  --shadow: 0 30px 70px rgba(15, 20, 12, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top, rgba(184, 255, 82, 0.28), transparent 28%),
    linear-gradient(160deg, #efe9db 0%, #f8f5ee 45%, #dde7d7 100%);
  color: var(--text);
  font-family: "Space Grotesk", sans-serif;
}

.desktop-shell {
  width: min(100%, 1560px);
  margin: 0 auto;
  padding: 28px;
}

.desktop-stage {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr minmax(240px, 300px);
  gap: 24px;
  align-items: stretch;
}

.desktop-copy,
.desktop-qr {
  padding: 26px;
  border-radius: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.desktop-board-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 56px);
  border-radius: 34px;
  background: rgba(16, 21, 15, 0.04);
  border: 1px solid rgba(17, 21, 18, 0.08);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.46);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.74rem;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-family: "Bebas Neue", sans-serif;
  font-size: clamp(4rem, 5vw, 6.4rem);
  line-height: 0.9;
  letter-spacing: 0.02em;
}

.lead,
.flow-list,
.qr-copy,
.board-caption {
  line-height: 1.5;
}

.lead {
  margin: 18px 0 24px;
  font-size: 1.03rem;
}

.flow-list {
  margin: 0;
  padding-left: 20px;
}

.flow-list li + li {
  margin-top: 10px;
}

.session-box {
  margin-top: 24px;
  padding: 18px;
  border-radius: 20px;
  background: rgba(17, 21, 18, 0.05);
}

.session-box span {
  display: block;
  color: var(--muted);
  font-size: 0.84rem;
  margin-bottom: 8px;
}

.session-box strong {
  font-size: 1.45rem;
}

#calibrationBoard {
  width: min(100%, 920px);
  aspect-ratio: 1 / 1;
  border-radius: 22px;
  background: #fff;
  box-shadow: 0 24px 60px rgba(17, 21, 18, 0.18);
}

.board-caption {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 20px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(7, 12, 8, 0.76);
  color: #f9f6ef;
  text-align: center;
}

.qr-box {
  display: grid;
  place-items: center;
  padding: 18px;
  border-radius: 24px;
  background: #fff;
  box-shadow: var(--shadow);
}

.qr-box canvas,
.qr-box img {
  max-width: 100%;
  height: auto;
}

.qr-copy {
  margin: 16px 0 18px;
  color: var(--muted);
}

.mobile-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 16px 18px;
  border-radius: 18px;
  background: var(--accent);
  color: var(--accent-dark);
  text-decoration: none;
  font-weight: 700;
}

@media (max-width: 1180px) {
  .desktop-stage {
    grid-template-columns: 1fr;
  }

  .desktop-board-wrap {
    min-height: auto;
    padding: 22px;
  }
}