:root {
  --text: #1f2933;
  --muted: #5f6c7b;
  --border: #d8dee9;
  --soft: #f6f8fb;
  --soft-2: #eef3f8;
  --accent: #243b53;
  --accent-2: #486581;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, "Helvetica Neue", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #ffffff 0%, #f7f9fc 100%);
  line-height: 1.65;
}

.page {
  max-width: 980px;
  margin: 0 auto;
  padding: 48px 24px 72px;
}

.hero {
  padding: 48px 0 28px;
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--soft);
  color: var(--accent-2);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 16px;
}

h1 {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1;
  margin: 0 0 16px;
  letter-spacing: -0.04em;
}

.subtitle {
  max-width: 820px;
  margin: 0 auto 18px;
  font-size: clamp(1.08rem, 2.5vw, 1.35rem);
  color: var(--accent);
  font-weight: 600;
}

.summary {
  max-width: 820px;
  margin: 0 auto 28px;
  color: var(--muted);
  font-size: 1.02rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.button {
  display: inline-block;
  padding: 9px 16px;
  border: 1px solid var(--accent-2);
  border-radius: 8px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  background: var(--white);
  transition: 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
  background: var(--soft-2);
}

.button.primary {
  background: var(--accent);
  color: var(--white);
}

.notice {
  margin: 28px 0 36px;
  padding: 16px 18px;
  border-left: 4px solid var(--accent-2);
  background: var(--soft);
  color: var(--accent);
  border-radius: 8px;
}

section {
  margin: 38px 0;
}

h2 {
  font-size: 1.55rem;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

h3 {
  margin: 0 0 8px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 16px;
}

.card {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--white);
}

.card p {
  margin: 0;
  color: var(--muted);
}

.clean-list,
.checklist {
  padding-left: 1.2em;
}

.clean-list li,
.checklist li {
  margin: 7px 0;
}

pre {
  overflow-x: auto;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #0f172a;
  color: #e5e7eb;
  font-size: 0.9rem;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

footer {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.94rem;
}

@media (max-width: 760px) {
  .page {
    padding: 28px 18px 56px;
  }

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