:root {
  color-scheme: light;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  --bg: #f5f6f8;
  --text: #0f172a;
  --muted: #475569;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --card: #ffffff;
  --border: #e2e8f0;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  --bg-soft: #eef2f5;
  --surface: #f8fafc;
  --surface-muted: #e8eef3;
  --text-soft: #334155;
  --accent-soft: rgba(15, 118, 110, 0.12);
  --focus-ring: rgba(15, 118, 110, 0.3);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.language-switcher {
  position: fixed;
  top: 18px;
  right: 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  z-index: 10;
}

.language-icon {
  display: inline-flex;
  color: var(--accent-dark);
}

.language-icon svg {
  width: 18px;
  height: 18px;
}

.language-switcher select {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 0.9rem;
  background: #fff;
  color: var(--text);
  font-weight: 600;
}

.language-switcher select:focus {
  outline: 2px solid rgba(15, 118, 110, 0.3);
  outline-offset: 2px;
}

.container {
  width: min(1100px, 100%);
  margin: 0 auto;
  padding: 0 20px;
}

.hero {
  background: radial-gradient(circle at top left, #d1fae5, transparent 50%),
    radial-gradient(circle at top right, #e0f2fe, transparent 50%),
    #ffffff;
  padding: 60px 0 50px;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 12px;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 12px;
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 760px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid var(--accent);
}

.button:hover {
  background: var(--accent-dark);
}

.button.secondary {
  background: #fff;
  color: var(--accent-dark);
}

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

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.toc {
  margin-top: -30px;
  padding: 24px;
  background: var(--card);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.toc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.toc-grid a {
  text-decoration: none;
  color: var(--accent-dark);
  background: #ecfeff;
  padding: 10px 12px;
  border-radius: 10px;
  font-weight: 600;
}

.section {
  margin: 40px 0;
}

.section-header h2 {
  margin-bottom: 8px;
}

.section-header p {
  margin: 0;
  color: var(--muted);
  max-width: 780px;
}

.callout {
  margin-top: 16px;
  padding: 16px 20px;
  border-left: 4px solid var(--accent);
  background: #f0fdfa;
  border-radius: 12px;
}

.card-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-top: 20px;
}

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

.card h3 {
  margin-top: 0;
}

.card ul {
  padding-left: 18px;
  color: var(--muted);
}

.flow-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-top: 16px;
}

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

.flow ol {
  padding-left: 18px;
}

.note {
  color: var(--muted);
  font-size: 0.9rem;
}

.code-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-top: 16px;
}

.swagger-preview {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.swagger-preview iframe {
  width: 100%;
  min-height: 560px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
}

pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 16px;
  border-radius: 12px;
  overflow-x: auto;
  font-size: 0.88rem;
}

.principles {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 12px;
}

.principles li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
}

.link-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  margin-top: 16px;
}

.link-grid a {
  text-decoration: none;
  color: var(--accent-dark);
  border: 1px solid var(--border);
  background: var(--card);
  padding: 12px 14px;
  border-radius: 12px;
  font-weight: 600;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0 48px;
  background: #fff;
}

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

@media (max-width: 720px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
}