/* color.wave — monochromatic zinc landing */

:root {
  --zinc-950: #09090b;
  --zinc-900: #18181b;
  --zinc-800: #27272a;
  --zinc-700: #3f3f46;
  --zinc-600: #52525b;
  --zinc-500: #71717a;
  --zinc-400: #a1a1aa;
  --zinc-300: #d4d4d8;
  --zinc-200: #e4e4e7;
  --zinc-100: #f4f4f5;

  --bg: var(--zinc-950);
  --fg: var(--zinc-100);
  --muted: var(--zinc-400);
  --border: var(--zinc-800);
  --accent: var(--zinc-300);

  --max: 720px;
  --pad: clamp(1.25rem, 4vw, 2rem);
  --radius: 4px;

  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

#fx-rainbow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 360px;
  pointer-events: none;
  z-index: 100;
  display: block;
}
@media (prefers-reduced-motion: reduce) {
  #fx-rainbow { display: none; }
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family:
    ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv01";
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(3rem, 10vh, 6rem) var(--pad) 2rem;
}

/* Hero */

.hero .logo {
  display: block;
  width: clamp(56px, 9vw, 88px);
  height: auto;
  margin: 0 0 1.25rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
  color: var(--zinc-100);
}

.hero .tagline {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  color: var(--zinc-300);
  margin: 0;
  line-height: 1.4;
  max-width: 32ch;
}

/* Pitch */

.pitch {
  margin-top: clamp(2rem, 5vh, 3rem);
  padding-top: clamp(2rem, 5vh, 3rem);
  border-top: 1px solid var(--border);
}

.pitch p {
  margin: 0;
  color: var(--zinc-400);
  font-size: 1rem;
  line-height: 1.7;
}

/* CTA */

.cta {
  margin-top: clamp(2.5rem, 6vh, 3.5rem);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.download {
  display: inline-flex;
  align-items: baseline;
  gap: 0.625rem;
  padding: 0.875rem 1.5rem;
  background: var(--zinc-300);
  color: var(--zinc-950);
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  border: 1px solid var(--zinc-300);
  transition:
    background 120ms ease,
    border-color 120ms ease,
    transform 120ms ease;
}

.download:hover {
  background: var(--zinc-100);
  border-color: var(--zinc-100);
}

.download:active {
  transform: translateY(1px);
}

.download .size {
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--zinc-700);
}

.cta-note {
  margin: 0;
  font-size: 0.875rem;
  color: var(--zinc-500);
}

/* How it works */

.how {
  margin-top: clamp(3rem, 8vh, 4.5rem);
  padding-top: clamp(2rem, 5vh, 3rem);
  border-top: 1px solid var(--border);
}

.how h2 {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--zinc-500);
  margin: 0 0 1.5rem;
}

.how ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.how li {
  font-size: 0.9375rem;
  color: var(--zinc-400);
  line-height: 1.6;
}

.how li strong {
  display: block;
  color: var(--zinc-200);
  font-weight: 500;
  margin-bottom: 0.125rem;
}

/* Footer */

footer {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem var(--pad) 3rem;
  border-top: 1px solid var(--border);
  margin-top: clamp(3rem, 8vh, 5rem);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8125rem;
  color: var(--zinc-500);
}

footer a {
  color: var(--zinc-300);
  text-decoration: none;
  transition: color 120ms ease;
}

footer a:hover {
  color: var(--zinc-100);
}

footer .dot {
  color: var(--zinc-700);
}

/* Selection */

::selection {
  background: var(--zinc-700);
  color: var(--zinc-100);
}

/* Reduced motion */

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}