:root {
  color-scheme: only light;
  --ink: #0b0b0b;
  --paper: #f7f7f7;
  --paper-strong: #ffffff;
  --muted: #6b6b6b;
  --line: #d6d6d6;
  --shadow: rgba(0, 0, 0, 0.08);
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Helvetica Neue", sans-serif;
  background: linear-gradient(180deg, #ffffff 0%, #f2f2f2 100%);
  color: var(--ink);
  min-height: 100vh;
  line-height: 1.6;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 64px;
  max-width: var(--max-width);
  margin: 0 auto;
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  z-index: 5;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border: 2px solid var(--ink);
  display: grid;
  place-items: center;
  font-family: "Space Grotesk", sans-serif;
  font-size: 18px;
  font-weight: 700;
}

.brand-title {
  font-family: "Space Grotesk", sans-serif;
  font-size: 18px;
  font-weight: 600;
  display: block;
}

.brand-sub {
  font-size: 12px;
  color: var(--muted);
}

.nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
}

.nav a {
  color: inherit;
  text-decoration: none;
  position: relative;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: var(--ink);
  transition: width 0.2s ease;
}

.nav a:hover::after {
  width: 100%;
}

button {
  border: 2px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-family: "Space Grotesk", sans-serif;
  padding: 12px 22px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px var(--shadow);
}

button.primary {
  background: var(--ink);
  color: #ffffff;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 64px 120px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 48px;
  align-items: center;
  padding: 40px 0 80px;
}

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 12px;
  color: var(--muted);
}

.hero h1 {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(38px, 4.2vw, 56px);
  margin: 10px 0 12px;
  line-height: 1.1;
}

.lead {
  font-size: 18px;
  max-width: 520px;
  color: #1f1f1f;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 22px 0 26px;
}

.hero-meta {
  display: flex;
  gap: 24px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.meta-label {
  display: block;
  font-size: 10px;
  color: var(--muted);
}

.hero-panel {
  display: grid;
  gap: 20px;
}

.grid-card,
.clue-card {
  border: 1px solid var(--line);
  background: var(--paper-strong);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 18px 40px var(--shadow);
}

.grid {
  height: 220px;
  border-radius: 12px;
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0 22px,
      #111111 22px 23px
    ),
    repeating-linear-gradient(
      0deg,
      transparent 0 22px,
      #111111 22px 23px
    );
  margin-bottom: 16px;
}

.grid-stats {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.clue-title {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  margin-bottom: 12px;
}

.clue-row {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  padding: 6px 0;
  border-bottom: 1px solid var(--line);
}

.clue-row:last-child {
  border-bottom: none;
}

.panel {
  margin: 36px 0;
  padding: 36px 40px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--paper-strong);
  box-shadow: 0 12px 32px var(--shadow);
}

.panel h2 {
  font-family: "Space Grotesk", sans-serif;
  margin-top: 0;
  font-size: 30px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.step-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  background: #fafafa;
  min-height: 220px;
}

.step-num {
  font-family: "Space Grotesk", sans-serif;
  font-size: 18px;
  color: var(--muted);
}

.features {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.feature {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fafafa;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 32px;
  align-items: center;
}

.device-stack {
  display: grid;
  gap: 16px;
  justify-items: end;
}

.device {
  border: 1px solid var(--line);
  background: var(--paper-strong);
  padding: 18px;
  border-radius: 18px;
  box-shadow: 0 14px 30px var(--shadow);
}

.device.phone {
  width: 220px;
}

.device.tablet {
  width: 280px;
}

.device-screen {
  border: 1px solid var(--line);
  padding: 16px;
  border-radius: 14px;
  background: #fafafa;
}

.mini-grid {
  height: 120px;
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0 18px,
      #111111 18px 19px
    ),
    repeating-linear-gradient(
      0deg,
      transparent 0 18px,
      #111111 18px 19px
    );
  margin-bottom: 12px;
  border-radius: 10px;
}

.mini-clues {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 10px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.pricing {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.price-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  background: var(--paper-strong);
}

.price-card.featured {
  border: 2px solid var(--ink);
}

.price {
  font-size: 18px;
  font-family: "Space Grotesk", sans-serif;
}

.price-card ul {
  list-style: none;
  padding: 0;
  margin: 18px 0 24px;
}

.price-card li {
  padding-left: 18px;
  position: relative;
  margin-bottom: 10px;
}

.price-card li::before {
  content: "•";
  position: absolute;
  left: 0;
}

.closing {
  text-align: center;
}

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 64px 80px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
  border-top: 1px solid var(--line);
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-links a {
  color: inherit;
  text-decoration: none;
}

.fine-print {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 960px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    position: static;
  }

  .nav {
    flex-wrap: wrap;
    gap: 12px 16px;
  }

  .hero,
  .split {
    grid-template-columns: 1fr;
  }

  .steps,
  .features,
  .pricing {
    grid-template-columns: 1fr;
  }

  .device-stack {
    justify-items: start;
  }

  .device.phone,
  .device.tablet {
    width: 100%;
  }

  .site-footer {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  main {
    padding: 30px 24px 80px;
  }

  .site-header {
    padding: 24px 24px 10px;
  }

  .hero-meta {
    flex-direction: column;
  }
}