:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #9da7b3;
  --accent: #58a6ff;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.hero {
  background: linear-gradient(160deg, #161b22 0%, #0d1117 100%);
  border-bottom: 1px solid var(--border);
  padding: 0 0 4rem;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 880px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.5px;
  font-size: 1.1rem;
}

.nav-link {
  color: var(--muted);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--text);
}

.hero-content {
  max-width: 880px;
  margin: 0 auto;
  padding: 3rem 1.5rem 0;
}

.hero-content h1 {
  font-size: 3rem;
  margin: 0 0 0.5rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.ascii-logo {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  color: var(--accent);
  font-size: clamp(0.42rem, 1.7vw, 0.95rem);
  line-height: 1.1;
  margin: 0 0 1rem;
  overflow-x: auto;
  text-shadow: 0 0 12px rgba(88, 166, 255, 0.45);
}

.tagline {
  color: var(--muted);
  font-size: 1.25rem;
  margin: 0;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.prompt {
  color: #3fb950;
  font-weight: 700;
  margin-right: 0.4rem;
}

.cursor {
  color: var(--accent);
  animation: blink 1.1s steps(1) infinite;
}

@keyframes blink {
  0%,
  50% {
    opacity: 1;
  }
  50.01%,
  100% {
    opacity: 0;
  }
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  display: grid;
  gap: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem;
}

.card h2 {
  margin-top: 0;
}

.button {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.6rem 1.1rem;
  background: var(--accent);
  color: #0d1117;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
}

.button:hover {
  filter: brightness(1.1);
}

.footer {
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  padding: 2rem 1.5rem;
  font-size: 0.9rem;
}

a {
  color: var(--accent);
}