*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --black: #0a0a0a;
  --white: #f5f5f0;
  --mid: #888;
  --border: #d0d0c8;
  --max-w: 900px;
}

html {
  font-size: 16px;
  background: var(--white);
  color: var(--black);
}

body {
  font-family: 'Space Mono', 'Courier New', Courier, monospace;
  line-height: 1.6;
  background: var(--white);
  color: var(--black);
  display: flex;
  justify-content: center;
  min-height: 100vh;
}

.frame {
  width: 100%;
  max-width: var(--max-w);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0 2rem;
}

/* ── Header ── */

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}

.logotype {
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: -0.02em;
}

.version {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--mid);
}

/* ── Main ── */

main {
  flex: 1;
}

/* ── Manifesto ── */

.manifesto {
  padding: 5rem 0 4rem;
  border-bottom: 1px solid var(--border);
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: 1px solid var(--border);
  padding: 0.25rem 0.75rem;
  margin-bottom: 2rem;
  color: var(--mid);
}

h1 {
  font-size: clamp(3rem, 10vw, 6.5rem);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin-bottom: 3rem;
}

.body-copy {
  max-width: 560px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 4rem;
}

/* ── Grid ── */

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
}

.cell {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1rem;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.num {
  color: var(--mid);
  font-size: 0.75rem;
  flex-shrink: 0;
  padding-top: 0.1em;
}

.label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Demo Section ── */

.demo-section {
  padding: 5rem 0 4rem;
}

.demo-inner {
  max-width: 480px;
}

.demo-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--mid);
  margin-bottom: 1.25rem;
}

h2 {
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.demo-desc {
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  color: #444;
}

.demo-link {
  display: inline-block;
  background: var(--black);
  color: var(--white);
  font-family: 'Space Mono', monospace;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  padding: 0.9rem 2rem;
  transition: background 0.15s ease, color 0.15s ease;
}

.demo-link:hover {
  background: var(--mid);
}

/* ── Footer ── */

footer {
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--mid);
  text-align: center;
}

/* ── Responsive ── */

@media (max-width: 600px) {
  .frame {
    padding: 0 1.25rem;
  }

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