:root {
  --bg: #0e1016;
  --panel: #171a23;
  --text: #f2f2f2;
  --muted: #a8adba;
  --line: #2a2f3d;
  --accent: #d7dbe8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #22283a 0, #0e1016 45%, #08090d 100%);
  color: var(--text);
  line-height: 1.7;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 8vw;
  border-bottom: 1px solid var(--line);
}

.logo {
  font-size: 24px;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand img {
  height: 56px;
  width: auto;
  display: block;
}
}

nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

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

.hero {
  max-width: 980px;
  margin: 0 auto;
  padding: 96px 24px 72px;
}

.eyebrow {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 13px;
}

h1 {
  font-size: clamp(56px, 10vw, 128px);
  line-height: 0.95;
  margin: 16px 0 24px;
  letter-spacing: -0.06em;
}
.hero-logo {
  display: block;
  width: min(680px, 92vw);
  height: auto;
  margin: 18px 0 32px;
}

.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;
}

@media (max-width: 760px) {
  .brand img {
    height: 26px;
  }

  .hero-logo {
    width: min(360px, 92vw);
  }
}
.subtitle {
  max-width: 720px;
  font-size: 20px;
  color: var(--accent);
}

.notice {
  margin-top: 32px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  border-radius: 18px;
  color: var(--muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 42px;
}

.card {
  display: block;
  padding: 24px;
  min-height: 180px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  border-radius: 22px;
  color: var(--text);
  text-decoration: none;
}

.card:hover {
  transform: translateY(-3px);
  transition: 0.2s ease;
  background: rgba(255, 255, 255, 0.09);
}

.card h2 {
  margin-top: 0;
}

.card p {
  color: var(--muted);
}

footer {
  padding: 32px 8vw;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 72px 24px;
}

.page h1 {
  font-size: clamp(40px, 7vw, 80px);
}

.chapter-list {
  list-style: none;
  padding: 0;
}

.chapter-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.chapter-list a {
  color: var(--text);
  text-decoration: none;
}

.chapter-list span {
  color: var(--muted);
  margin-left: 8px;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 16px;
  }

  .cards {
    grid-template-columns: 1fr;
  }
}