/* SplitChuni — landing. Mismo sistema monocromo que la app (ver src/index.css). */

@font-face {
  font-family: 'Inter';
  src: local('Inter');
}

:root {
  --color-mono-0: #ffffff;
  --color-mono-50: #fafafa;
  --color-mono-100: #f5f5f5;
  --color-mono-150: #ededed;
  --color-mono-200: #e5e5e5;
  --color-mono-300: #d4d4d4;
  --color-mono-400: #a3a3a3;
  --color-mono-500: #737373;
  --color-mono-600: #525252;
  --color-mono-700: #404040;
  --color-mono-800: #262626;
  --color-mono-900: #171717;
  --color-mono-950: #0a0a0a;

  --color-canvas: #f5f5f5;
  --color-surface: #ffffff;
  --color-surface-sunken: #f0f0f0;
  --color-surface-inverse: #0a0a0a;

  --color-ink: #0a0a0a;
  --color-ink-muted: #525252;
  --color-ink-subtle: #737373;
  --color-ink-faint: #a3a3a3;
  --color-ink-inverse: #ffffff;

  --color-line: #e5e5e5;
  --color-line-strong: #d4d4d4;

  --color-danger: #b3261e;

  --radius-md: 0.875rem;
  --radius-lg: 1.125rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 1.75rem;

  --shadow-md: 0 2px 4px rgb(10 10 10 / 0.04), 0 6px 16px -6px rgb(10 10 10 / 0.1);
  --shadow-lg: 0 4px 8px rgb(10 10 10 / 0.04), 0 16px 32px -12px rgb(10 10 10 / 0.14);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* -- nav ----------------------------------------------------------------- */

.nav {
  padding: 1.25rem 0;
}

.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--color-ink);
}

.brand img {
  width: 28px;
  height: 28px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  font-size: 0.9rem;
  color: var(--color-ink-muted);
}

.nav-links a {
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--color-ink);
}

/* -- hero ------------------------------------------------------------------ */

.hero {
  padding: 3.5rem 0 3rem;
  text-align: center;
}

.hero-icon {
  width: 88px;
  height: 88px;
  margin: 0 auto 1.75rem;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
}

.hero h1 {
  font-size: clamp(2rem, 1.5rem + 2.2vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
}

.hero p.lead {
  color: var(--color-ink-muted);
  font-size: clamp(1.05rem, 1rem + 0.3vw, 1.2rem);
  max-width: 560px;
  margin: 0 auto 2rem;
}

.cta-row {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--color-surface-inverse);
  color: var(--color-ink-inverse);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-ink);
  border-color: var(--color-line-strong);
}

.hint {
  margin-top: 0.9rem;
  font-size: 0.82rem;
  color: var(--color-ink-faint);
}

/* -- features -------------------------------------------------------------- */

.features {
  padding: 2.5rem 0 4rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
}

.card .k {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--color-ink-faint);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.card p {
  margin: 0;
  color: var(--color-ink-muted);
  font-size: 0.92rem;
}

/* -- how ------------------------------------------------------------------- */

.section {
  padding: 1rem 0 4rem;
}

.section h2 {
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

.section p.sub {
  color: var(--color-ink-muted);
  margin: 0 0 2rem;
  max-width: 520px;
}

.steps {
  display: grid;
  gap: 1rem;
}

.step {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
}

.step .n {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-ink-faint);
  font-size: 0.9rem;
  padding-top: 0.1rem;
}

.step h3 {
  margin: 0 0 0.2rem;
  font-size: 0.98rem;
}

.step p {
  margin: 0;
  color: var(--color-ink-muted);
  font-size: 0.9rem;
}

/* -- footer ------------------------------------------------------------------ */

footer {
  border-top: 1px solid var(--color-line);
  padding: 2rem 0 3rem;
}

footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--color-ink-faint);
}

footer a {
  text-decoration: none;
  color: var(--color-ink-muted);
}

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

.footer-links {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* -- legal pages ------------------------------------------------------------- */

.legal {
  padding: 3rem 0 4rem;
}

.legal .wrap {
  max-width: 720px;
}

.legal h1 {
  font-size: 1.9rem;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
}

.legal .updated {
  color: var(--color-ink-faint);
  font-size: 0.85rem;
  margin: 0 0 2.5rem;
  font-family: var(--font-mono);
}

.legal h2 {
  font-size: 1.15rem;
  margin: 2.2rem 0 0.75rem;
  letter-spacing: -0.01em;
}

.legal p,
.legal li {
  color: var(--color-ink-muted);
  font-size: 0.96rem;
}

.legal ul {
  padding-left: 1.2rem;
}

.legal a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-line-strong);
}

.back-link {
  display: inline-block;
  margin-bottom: 2rem;
  font-size: 0.88rem;
  color: var(--color-ink-muted);
  text-decoration: none;
}

.back-link:hover {
  color: var(--color-ink);
}

@media (max-width: 640px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .nav .wrap {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .nav-links {
    gap: 1.1rem;
    width: 100%;
    flex-wrap: wrap;
  }
  footer .wrap {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 400px) {
  .nav-links {
    gap: 0.85rem;
    font-size: 0.82rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-canvas: #0a0a0a;
    --color-surface: #171717;
    --color-surface-sunken: #1f1f1f;
    --color-surface-inverse: #ffffff;
    --color-ink: #fafafa;
    --color-ink-muted: #a3a3a3;
    --color-ink-subtle: #a3a3a3;
    --color-ink-faint: #737373;
    --color-ink-inverse: #0a0a0a;
    --color-line: #262626;
    --color-line-strong: #404040;
  }
}