:root {
  --bg: #0f172a;
  --surface: rgba(15, 23, 42, 0.85);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --border: rgba(148, 163, 184, 0.3);
  --card-bg: rgba(15, 23, 42, 0.75);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.25), rgba(15, 23, 42, 1));
  font-family: 'Noto Sans KR', 'Pretendard', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.page {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.hero {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(59, 130, 246, 0.1));
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 2.5rem 2rem;
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.45);
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: 2.4rem;
  font-weight: 700;
}

.hero p {
  margin: 0;
  font-size: 1.1rem;
  color: var(--muted);
  line-height: 1.6;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.8rem 1.6rem;
  box-shadow: 0 15px 30px rgba(15, 23, 42, 0.35);
}

.card h2 {
  margin: 0 0 1rem;
  font-size: 1.45rem;
}

.card .note {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.list li {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  border-left: 4px solid rgba(56, 189, 248, 0.4);
  padding: 0.2rem 0 0.2rem 1rem;
}

.list li strong {
  font-size: 1.05rem;
}

.list li p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

code {
  font-family: 'Fira Code', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  background: rgba(148, 163, 184, 0.12);
  padding: 0.15rem 0.35rem;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text);
}

.badge {
  align-self: flex-start;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.25);
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
}

.grid {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.grid li {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 12px;
  padding: 0.8rem 1rem;
  font-size: 0.95rem;
}

@media (max-width: 720px) {
  .hero {
    padding: 2rem 1.5rem;
  }

  .hero h1 {
    font-size: 2rem;
  }
}