:root {
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-text-faint: #94a3b8;
  --color-border: #f1f5f9;
  --color-border-strong: #e2e8f0;
  --color-accent: #0891a8;
  --color-brand: #53d3ee;
  --radius-lg: 20px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: #f8fafc;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  color: var(--color-text);
}

.card {
  width: 100%;
  max-width: 640px;
  background: #fff;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

/* Header */

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--color-border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
}

.logo {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  display: block;
}

.wordmark {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.tagline {
  font-size: 11px;
  color: var(--color-text-faint);
  white-space: nowrap;
}

/* Hero */

.hero {
  padding: 48px 32px 40px;
}

.hero-logo {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  margin-bottom: 28px;
  display: block;
}

h1 {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 38px;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
  color: var(--color-text);
}

h1 .accent {
  color: var(--color-accent);
}

.lede {
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-text-muted);
  max-width: 400px;
  margin: 0 0 32px;
}

/* Socials */

.socials {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}

.socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.socials a svg {
  width: 16px;
  height: 16px;
}

.socials a:hover {
  border-color: var(--color-brand);
  color: var(--color-accent);
}

.socials a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Footer */

.footer {
  border-top: 1px solid var(--color-border);
  padding: 14px 32px;
}

.footer p {
  font-size: 11px;
  color: var(--color-text-faint);
  margin: 0;
}

/* Responsive */

@media (max-width: 520px) {
  .nav {
    padding: 16px 20px;
  }

  .tagline {
    display: none;
  }

  .hero {
    padding: 36px 20px 32px;
  }

  h1 {
    font-size: 30px;
  }

  .footer {
    padding: 14px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .socials a {
    transition: none;
  }
}