:root {
  --primary: #15222d;
  --secondary: #6b7884;
  --tertiary: #00a3b4;
  --neutral: #eff3f6;
  --surface: #ffffff;
  --hairline: rgba(107, 120, 132, 0.24);
  --warning: #8a4029;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--primary);
  background: var(--neutral);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 5vw, 56px);
  background: rgba(239, 243, 246, 0.92);
  border-bottom: 1px solid var(--hairline);
  backdrop-filter: blur(16px);
}

.wordmark {
  font-family: "Space Grotesk", Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
}

nav {
  display: flex;
  gap: clamp(14px, 3vw, 30px);
  color: var(--secondary);
  font-size: 0.92rem;
}

nav a:hover {
  color: var(--primary);
}

.hero {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 84svh;
  padding: clamp(48px, 8vw, 96px) clamp(18px, 5vw, 56px);
  overflow: hidden;
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--secondary);
  font-family: "Space Grotesk", Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 24px;
  font-family: "Space Grotesk", Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(4rem, 13vw, 11rem);
  font-weight: 700;
  line-height: 0.86;
}

.hero-lede {
  max-width: 640px;
  margin-bottom: 34px;
  color: rgba(21, 34, 45, 0.76);
  font-size: clamp(1.15rem, 2vw, 1.65rem);
  line-height: 1.35;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-family: "Space Grotesk", Inter, ui-sans-serif, system-ui, sans-serif;
  font-weight: 700;
}

.button-primary {
  color: #fff;
  background: var(--tertiary);
}

.button-secondary {
  color: var(--primary);
  background: var(--surface);
  border-color: var(--hairline);
}

.hero-board {
  position: absolute;
  right: clamp(-220px, -12vw, -80px);
  bottom: 28px;
  z-index: 1;
  width: min(760px, 72vw);
  padding: 22px;
  border: 1px solid var(--hairline);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 28px 80px rgba(21, 34, 45, 0.12);
}

.board-topline,
.session-strip,
.mode-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.board-topline {
  margin-bottom: 18px;
  color: var(--secondary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.session-strip,
.mode-strip,
.rule-grid > div {
  border: 1px solid var(--hairline);
  border-radius: 8px;
  background: var(--surface);
}

.session-strip {
  padding: 18px;
}

.session-strip strong {
  display: block;
  margin-bottom: 4px;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
}

.session-strip span {
  color: var(--secondary);
}

.session-strip button {
  min-width: 154px;
  height: 56px;
  color: #fff;
  background: var(--tertiary);
  border: 0;
  border-radius: 4px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.session-strip button.locked {
  color: var(--primary);
  background: var(--surface);
  border: 1px solid var(--hairline);
}

.mode-strip {
  margin-top: 12px;
  padding: 14px 16px;
}

.mode-strip span {
  color: var(--secondary);
}

.rule-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.rule-grid > div {
  padding: 16px;
}

.rule-grid p {
  margin-bottom: 12px;
  font-weight: 800;
}

.rule-grid ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  color: var(--secondary);
  list-style: none;
}

.section {
  padding: clamp(64px, 10vw, 112px) clamp(18px, 5vw, 56px);
}

.section-heading {
  max-width: 780px;
  margin-bottom: 32px;
}

h2 {
  font-family: "Space Grotesk", Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(2.1rem, 6vw, 4.75rem);
  line-height: 0.96;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.platform-card {
  min-height: 230px;
  padding: 24px;
  border: 1px solid var(--hairline);
  border-radius: 8px;
  background: var(--surface);
}

.platform-kicker {
  display: inline-flex;
  margin-bottom: 36px;
  color: var(--tertiary);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.platform-card h3 {
  margin-bottom: 12px;
  font-size: 1.4rem;
}

.platform-card p {
  color: var(--secondary);
  line-height: 1.55;
}

.stats-panel {
  display: grid;
  grid-template-columns: repeat(8, minmax(96px, 1fr));
  gap: 8px;
  padding-bottom: 4px;
  overflow-x: auto;
}

.stat {
  display: grid;
  gap: 6px;
  min-width: 96px;
  padding: 14px;
  text-align: left;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  background: var(--surface);
  cursor: pointer;
}

.stat span {
  color: var(--secondary);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.stat strong {
  font-size: 1.45rem;
}

.stat.active {
  border-color: var(--tertiary);
  box-shadow: inset 0 -3px 0 var(--tertiary);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 28px clamp(18px, 5vw, 56px);
  color: var(--secondary);
  border-top: 1px solid var(--hairline);
}

@media (max-width: 860px) {
  .hero {
    align-items: start;
    min-height: auto;
    padding-bottom: 260px;
  }

  .hero-board {
    right: 18px;
    bottom: 20px;
    left: 18px;
    width: auto;
  }

  .platform-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .session-strip {
    align-items: flex-start;
    flex-direction: column;
  }

  .session-strip button {
    width: 100%;
  }

  .rule-grid {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
  }
}