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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin: 0;
  padding: 0;
  color: #1a1a1a;
  background: #f8f9fc;
  line-height: 1.65;
}

header {
  background: #0d1b2a;
  color: #fff;
  text-align: center;
  padding: 3.5rem 1.5rem 2.5rem;
}

header h1 {
  margin: 0 0 0.4rem;
  font-size: 2.75rem;
  letter-spacing: -0.03em;
}

.tagline {
  margin: 0;
  font-size: 1.1rem;
  opacity: 0.65;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

section {
  margin-bottom: 3.5rem;
}

.hero h2 {
  font-size: 1.9rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.1rem;
  color: #444;
  max-width: 560px;
}

h2 {
  font-size: 1.3rem;
  margin: 0 0 1rem;
  color: #0d1b2a;
  border-bottom: 2px solid #e0e1dd;
  padding-bottom: 0.5rem;
}

pre {
  background: #0d1b2a;
  color: #cdd5e0;
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.75;
  margin: 0.75rem 0;
}

code { font-family: "SF Mono", "Fira Code", monospace; }

.note {
  font-size: 0.9rem;
  color: #666;
  margin-top: 0.75rem;
}

.note a { color: #0d1b2a; }

.tool-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.tool-list li {
  background: #fff;
  border: 1px solid #e0e1dd;
  border-radius: 8px;
  padding: 1rem 1.25rem;
}

.tool-list strong {
  display: block;
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 0.9rem;
  color: #0d1b2a;
  margin-bottom: 0.25rem;
}

.tool-list span {
  font-size: 0.925rem;
  color: #555;
}

.btn {
  display: inline-block;
  background: #0d1b2a;
  color: #fff;
  padding: 0.7rem 1.5rem;
  margin-top: 1.5rem;
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
}

.btn:hover { background: #1a3348; }

footer {
  text-align: center;
  padding: 1.5rem;
  background: #0d1b2a;
  color: rgba(255, 255, 255, 0.45);
  font-size: 0.85rem;
}