:root {
  --color-bg: #EFF5F5;
  --color-surface: #FFFFFF;
  --color-surface-subtle: #E1EDED;
  --color-border: #CADDDC;
  --color-text: #000000;
  --color-text-muted: #596E6E;
  --color-brand: #0061F5;
  --color-brand-strong: #052B82;
  --color-success: #00A354;
  --color-notify: #F2CB2B;
  --shadow-soft: 0 12px 28px rgba(0, 0, 0, 0.06);
  --radius-lg: 4px;
  --radius-md: 4px;
  --space-1: 8px;
  --space-2: 12px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --font-body: Roboto, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
}

body {
  min-height: 100vh;
  line-height: 1.55;
}

a {
  color: var(--color-brand);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-brand);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.header-inner {
  width: min(1120px, 94vw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) 0;
}

.brand {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
}

.brand-logo {
  width: 176px;
  height: auto;
  display: block;
}

.nav-shell {
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  color: #fff;
  border-radius: 4px;
  padding: 10px 12px;
  line-height: 1;
}

.nav-toggle-icon {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
}

.nav-toggle-icon span {
  width: 18px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  display: block;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.nav-link {
  color: #fff;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.95rem;
}

.nav-link:hover,
.nav-link:focus-visible {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.28);
  outline: none;
}

.nav-link[aria-current="page"] {
  background: #fff;
  color: var(--color-brand-strong);
  font-weight: 600;
}

.page-wrap {
  width: min(1120px, 94vw);
  margin: var(--space-4) auto var(--space-5);
}

.content-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: clamp(16px, 3vw, 36px);
}

.page-kicker {
  color: var(--color-brand-strong);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 700;
  margin: 0 0 var(--space-2);
}

.page-title {
  margin: 0;
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  line-height: 1.2;
}

.page-subtitle {
  margin: var(--space-2) 0 0;
  color: var(--color-text-muted);
}

.doc-meta {
  margin-top: var(--space-3);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-2);
}

.meta-item {
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 10px 12px;
}

.meta-label {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  margin-bottom: 4px;
}

.doc-content {
  margin-top: var(--space-4);
}

.doc-content h1,
.doc-content h2,
.doc-content h3,
.doc-content h4,
.doc-content h5,
.doc-content h6 {
  color: var(--color-brand-strong);
  line-height: 1.25;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.doc-content h1 {
  font-size: 1.7rem;
}

.doc-content h2 {
  font-size: 1.35rem;
}

.doc-content h3 {
  font-size: 1.1rem;
}

.doc-content p,
.doc-content li {
  color: var(--color-text);
}

.doc-content ul,
.doc-content ol {
  padding-left: 1.35rem;
}

.doc-content blockquote {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border-left: 4px solid var(--color-brand);
  background: rgba(0, 97, 245, 0.06);
  border-radius: 0 10px 10px 0;
}

.doc-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  background: #f2f6f8;
  border: 1px solid #dde6ea;
  border-radius: 6px;
  padding: 1px 5px;
  font-size: 0.92em;
}

.doc-content pre {
  overflow-x: auto;
  background: #0f1720;
  color: #f8fafc;
  border-radius: 12px;
  padding: 12px;
}

.doc-content pre code {
  background: transparent;
  border: 0;
  color: inherit;
  padding: 0;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  display: block;
  overflow-x: auto;
}

.doc-content th,
.doc-content td {
  border: 1px solid var(--color-border);
  padding: 10px;
  text-align: left;
  vertical-align: top;
  min-width: 120px;
}

.doc-content th {
  background: #f2f8ff;
  color: var(--color-brand-strong);
}

.site-footer {
  width: min(1120px, 94vw);
  margin: 0 auto 24px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.home-links {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-2);
}

.home-link {
  display: block;
  border: 1px solid var(--color-brand-strong);
  background: var(--color-brand-strong);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  color: #fff;
  text-decoration: none;
}

.home-link:hover,
.home-link:focus-visible {
  border-color: var(--color-brand);
  box-shadow: 0 0 0 3px rgba(0, 97, 245, 0.25);
  outline: none;
}

.home-link h3 {
  margin: 0;
  color: #fff;
}

.home-link p {
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.9);
}

.error-note {
  border: 1px solid #ffd4d2;
  background: #fff5f4;
  color: #7d1e18;
  border-radius: 10px;
  padding: 10px 12px;
}

@media (max-width: 720px) {
  .header-inner {
    align-items: center;
  }

  .brand-logo {
    width: 148px;
  }

  .nav-shell {
    margin-left: auto;
    position: relative;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
  }

  .nav-links {
    display: none;
  }

  .nav-shell.nav-open .nav-links {
    display: flex;
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    flex-direction: column;
    min-width: 210px;
    padding: 8px;
    background: var(--color-brand);
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 4px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.22);
  }

  .nav-shell.nav-open .nav-link {
    width: 100%;
    border: 0;
    border-radius: 0;
    padding: 10px 8px;
    background: transparent;
    font-weight: 500;
  }

  .nav-shell.nav-open .nav-link + .nav-link {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
  }

  .nav-shell.nav-open .nav-link:hover,
  .nav-shell.nav-open .nav-link:focus-visible {
    background: transparent;
    border-color: transparent;
    color: #d4e6ff;
    font-weight: 700;
  }

  .nav-shell.nav-open .nav-link[aria-current='page'] {
    background: transparent;
    color: #fff;
    font-weight: 700;
  }

  .doc-content table {
    font-size: 0.95rem;
  }
}