:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #5b5b5b;
  --border: #d9d9d9;
  --accent: #111111;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.page-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 2rem 1rem 1rem;
  text-align: center;
}

.brand-title {
  margin: 0;
  font-size: clamp(2rem, 8vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-subtitle {
  margin: 0;
  font-size: 1.1rem;
  color: var(--muted);
}

.page-main {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

.intro-section,
.features-section,
.examples-section {
  margin-bottom: 3rem;
}

.intro-section h2,
.features-section h2,
.examples-section h2 {
  margin: 0 0 1rem;
  font-size: 1.75rem;
  font-weight: 600;
}

.intro-section p {
  margin: 0;
  font-size: 1.1rem;
  color: var(--muted);
}

.features-list,
.examples-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.features-list li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
}

.features-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

.examples-list li {
  padding: 0.75rem 0;
}

.examples-list a {
  color: var(--accent);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 500;
}

.examples-list a:hover {
  text-decoration: underline;
}

@media (min-width: 640px) {
  .page-header {
    padding-top: 3rem;
  }

  .page-main {
    padding: 3rem 2rem 4rem;
  }
}