:root {
  --brand: #7C3AED;
  --brand-soft: #F3E8FF;
  --text: #1a1a1a;
  --text-muted: #666;
  --text-subtle: #999;
  --border: #eee;
  --bg: #ffffff;
  --bg-soft: #fafafa;
  --max-width: 760px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: 'Pretendard', 'Apple SD Gothic Neo', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 16px 20px;
  background: var(--bg);
}

.site-header .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.brand {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

.brand .dot {
  color: var(--brand);
}

.site-nav {
  display: flex;
  gap: 20px;
  font-size: 14px;
}

.site-nav a {
  color: var(--text-muted);
  font-weight: 500;
}

.site-nav a[aria-current="page"] {
  color: var(--brand);
  font-weight: 600;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.doc h1 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

.doc .meta {
  color: var(--text-subtle);
  font-size: 13px;
  margin: 0 0 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.doc h2 {
  font-size: 19px;
  font-weight: 700;
  margin: 36px 0 12px;
  letter-spacing: -0.01em;
}

.doc h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 22px 0 8px;
  color: var(--text);
}

.doc p,
.doc li {
  color: var(--text);
  font-size: 15px;
}

.doc ul,
.doc ol {
  padding-left: 22px;
}

.doc ul li,
.doc ol li {
  margin-bottom: 6px;
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 20px;
  font-size: 14px;
}

.doc table th,
.doc table td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.doc table th {
  background: var(--bg-soft);
  font-weight: 600;
  color: var(--text);
}

.doc .callout {
  background: var(--brand-soft);
  border-left: 3px solid var(--brand);
  padding: 12px 16px;
  border-radius: 6px;
  margin: 16px 0;
  font-size: 14px;
  color: #4c1d95;
}

.doc .todo {
  background: #FFF8E1;
  border-left: 3px solid #F59E0B;
  padding: 10px 14px;
  border-radius: 6px;
  margin: 12px 0;
  font-size: 13px;
  color: #7C5A0F;
}

.doc strong {
  font-weight: 700;
}

.doc code {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.hero {
  text-align: center;
  padding: 48px 0 24px;
}

.hero h1 {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0 0 12px;
}

.hero p {
  font-size: 17px;
  color: var(--text-muted);
  margin: 0;
}

.hero .cta {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  background: var(--brand);
  color: #fff;
  border: 1px solid var(--brand);
}

.btn:hover {
  text-decoration: none;
  background: #6D28D9;
  border-color: #6D28D9;
}

.btn.secondary {
  background: #fff;
  color: var(--brand);
}

.btn.secondary:hover {
  background: var(--brand-soft);
}

.btn.disabled {
  background: #eee;
  color: var(--text-subtle);
  border-color: #eee;
  cursor: not-allowed;
  pointer-events: none;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 40px;
}

.card {
  display: block;
  padding: 18px 18px 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  background: var(--bg);
  transition: border-color .15s ease, transform .15s ease;
}

.card:hover {
  text-decoration: none;
  border-color: var(--brand);
  transform: translateY(-1px);
}

.card h3 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
}

.card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 20px 48px;
  font-size: 13px;
  color: var(--text-subtle);
}

.site-footer .inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-footer .biz {
  margin-bottom: 12px;
  line-height: 1.8;
}

.site-footer .biz span {
  display: inline-block;
  margin-right: 14px;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 10px;
}

.site-footer nav a {
  color: var(--text-muted);
}

.site-footer .copyright {
  font-size: 12px;
  color: var(--text-subtle);
}

@media (max-width: 560px) {
  .site-header .inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .site-nav {
    gap: 14px;
  }
  main {
    padding: 28px 18px 60px;
  }
  .hero {
    padding: 32px 0 16px;
  }
  .hero h1 {
    font-size: 32px;
  }
  .doc h1 {
    font-size: 24px;
  }
  .doc h2 {
    font-size: 17px;
  }
}

@media print {
  .site-header,
  .site-footer {
    display: none;
  }
  main {
    max-width: none;
    padding: 0;
  }
  a {
    color: var(--text);
    text-decoration: underline;
  }
}