:root {
  --bg: #fff;
  --bg-alt: #f8f9fa;
  --border: #e2e4e8;
  --text-main: #1a1a1a;
  --text-muted: #4a4a4a;
  --text-soft: #6b7280;
  --accent: #2563eb;
  --radius: 8px;
  --nav-height: 64px;
}

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

html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 13px;
}

.logo-mark {
  padding: 6px 10px;
  border-radius: var(--radius);
  background: var(--text-main);
  color: var(--bg);
}

.logo-text {
  color: var(--text-soft);
}

.logo-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: inherit;
  text-decoration: none;
}

.logo-link:hover {
  text-decoration: none;
  opacity: 0.85;
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 13px;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 0;
  position: relative;
}

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

.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.hero {
  padding-top: 48px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1.1fr);
  gap: 40px;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(32px, 4vw, 40px);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 14px;
}

.hero-tagline {
  margin: 0 0 14px;
  font-size: 17px;
  color: var(--text-muted);
}

.hero-text {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
}

.btn.primary {
  background: var(--text-main);
  color: var(--bg);
  border-color: var(--text-main);
}

.btn.secondary {
  background: var(--bg);
  border-color: var(--border);
  color: var(--text-main);
}

.btn.ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
}

.btn:hover {
  text-decoration: none;
  opacity: 0.9;
}

.hero-highlight {
  padding: 18px 18px 20px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.stat {
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
}

.stat-value {
  font-size: 20px;
  font-weight: 600;
}

.stat-label {
  margin-top: 2px;
  font-size: 12px;
  color: var(--text-soft);
}

.hero-note {
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-soft);
}

h2 {
  font-size: 24px;
  margin: 0 0 10px;
}

h3 {
  font-size: 17px;
  margin-top: 0;
}

.section-intro {
  margin: 0 0 22px;
  font-size: 14px;
  color: var(--text-soft);
  max-width: 640px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.card {
  padding: 18px 18px 16px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
}

.card p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.card-list {
  list-style: none;
  padding: 0;
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--text-soft);
}

.card-list li {
  padding-left: 14px;
  position: relative;
  margin-bottom: 4px;
}

.card-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--text-soft);
}

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.card-link {
  font-size: 13px;
  padding: 6px 10px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  color: var(--accent);
  border: 1px solid var(--border);
}

.card-link:hover {
  text-decoration: none;
  background: var(--border);
}

.usecase-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.usecase {
  padding: 18px 18px 16px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
}

.usecase p {
  font-size: 14px;
  color: var(--text-muted);
}

.usecase-meta {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-soft);
}

.access-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.access-block {
  padding: 18px 18px 16px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
}

.access-block ul {
  margin: 8px 0 10px;
  padding-left: 18px;
}

.code-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.code-block {
  padding: 18px 18px 16px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
}

.code-block ul {
  margin: 8px 0 10px;
  padding-left: 18px;
}

.citation-block {
  padding: 18px 18px 16px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
}

.citation-block pre {
  background: var(--bg);
  color: var(--text-main);
  padding: 10px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow-x: auto;
  font-size: 11px;
}

.faq-list details {
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
}

.faq-list details + details {
  margin-top: 8px;
}

.faq-list summary {
  cursor: pointer;
  outline: none;
}

.faq-list p {
  margin-top: 8px;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 18px 0 24px;
  background: var(--bg-alt);
}

.footer-inner {
  font-size: 13px;
  color: var(--text-soft);
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  background: var(--bg-alt);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  color: var(--text-muted);
}

.data-table th,
.data-table td {
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--border);
}

.data-table th {
  background: var(--bg-alt);
  font-weight: 600;
  color: var(--text-main);
}

.data-table td a {
  font-weight: 500;
}

.layout-block {
  display: block;
  margin: 12px 0;
  padding: 14px 16px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-main);
}

.layout-block code {
  background: none;
  padding: 0;
  border: none;
  font-size: inherit;
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .nav {
    display: none;
  }

  .card-grid,
  .usecase-grid,
  .code-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .access-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 600px) {
  .section {
    padding: 52px 0;
  }

  .hero-highlight {
    margin-top: 8px;
  }
}