:root {
  --header-h:    64px;
  --sidebar-w:   240px;
  --content-max: 780px;
  --section-gap: 3.5rem;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  contain: layout;
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--brand-dim);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.logo-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.logo-sub {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.02em;
  margin-left: 0.125rem;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-group {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.btn-lang {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0.3rem 0.45rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.btn-lang:hover,
.btn-lang.active {
  color: var(--brand-mid);
  background: var(--brand-dim);
}

.lang-sep {
  color: var(--text-faint);
  font-size: 0.75rem;
}

.btn-icon {
  background: none;
  border: 1px solid var(--border);
  cursor: pointer;
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.btn-icon:hover {
  color: var(--text-primary);
  border-color: var(--brand-border);
  background: var(--brand-dim);
}

.btn-menu-toggle { display: none; }

.layout {
  display: flex;
  padding-top: var(--header-h);
  min-height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
}

.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 2rem 0 2rem 1.5rem;
  border-right: 1px solid var(--border);
  contain: layout;
}

.sidebar-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.nav-link {
  display: block;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
  opacity: 1;
}

.nav-link.active {
  color: var(--brand-mid);
  background: var(--brand-dim);
  font-weight: 600;
}

.main-content {
  flex: 1;
  min-width: 0;
  padding: 3rem 3rem 5rem 3rem;
}

.hero {
  padding-bottom: var(--section-gap);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--section-gap);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--brand-dim);
  border: 1px solid var(--brand-border);
  border-radius: 99px;
  padding: 0.3rem 0.75rem;
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brand-mid);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: 1.15rem;
  color: var(--text-primary);
  max-width: 56ch;
  line-height: 1.6;
  margin-bottom: 1.75rem;
  font-style: italic;
  font-weight: 400;
  opacity: 0.8;
}

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 0.25rem 0.75rem;
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.doc-section {
  margin-bottom: var(--section-gap);
  padding-bottom: var(--section-gap);
  border-bottom: 1px solid var(--border);
}

.doc-section:last-child {
  border-bottom: none;
}

.doc-section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--brand-border);
  position: relative;
}

.doc-section h2::before {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 2.5rem;
  height: 2px;
  background: var(--brand);
  border-radius: 99px;
}

.doc-section h3 {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.doc-section h4 {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.doc-section p {
  color: var(--text-primary);
  line-height: 1.75;
  max-width: 70ch;
  margin-bottom: 1rem;
  opacity: 0.88;
}

.doc-section pre {
  margin: 0.75rem 0 1.25rem;
}

.table-wrap {
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

thead {
  background: var(--bg-elevated);
}

thead th {
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

tbody tr:last-child { border-bottom: none; }

tbody tr:hover { background: var(--bg-surface); }

tbody td {
  padding: 0.7rem 1rem;
  color: var(--text-primary);
  vertical-align: middle;
  line-height: 1.5;
}

tbody td:first-child { color: var(--text-primary); font-weight: 500; }

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.badge-green {
  background: var(--badge-green-bg);
  color: var(--badge-green-text);
  border: 1px solid var(--badge-green-border);
}

.badge-orange {
  background: var(--badge-orange-bg);
  color: var(--badge-orange-text);
  border: 1px solid var(--badge-orange-border);
}

.note {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  margin: 0.75rem 0;
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.55;
  opacity: 0.92;
}

.note svg {
  flex-shrink: 0;
  margin-top: 0.15rem;
  color: var(--brand-mid);
  opacity: 0.8;
}

.note-warn {
  border-color: var(--warn-border);
  background: var(--warn-bg);
}

.note-warn svg { color: var(--warn-text); }

.note-alert {
  border-color: var(--brand-border);
  background: var(--brand-dim);
}

.note-alert svg { color: var(--brand-mid); }

.param-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 0.75rem 0 1.5rem;
}

.param-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.param-item code {
  flex-shrink: 0;
  min-width: 6rem;
}

.bedrock-section {
  border: 1px solid var(--brand-border);
  background: var(--brand-dim);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 2rem;
}

.bedrock-section h2 {
  border-bottom-color: var(--brand-border);
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.bedrock-section p {
  margin-bottom: 0;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
  padding: 1.5rem;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.8rem;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--brand-mid);
  font-size: 0.75rem;
}

.footer-sep { color: var(--text-faint); }

.footer-rights { color: var(--text-faint); }

@media (max-width: 1024px) {
  .main-content { padding: 2.5rem 2rem 4rem; }
}

@media (max-width: 768px) {
  :root { --sidebar-w: 100%; }

  .logo-sub { display: none; }
  .btn-menu-toggle { display: flex; }

  .layout { flex-direction: column; }

  .sidebar {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: calc(100vh - var(--header-h));
    background: var(--bg);
    z-index: 90;
    padding: 1.5rem;
    border-right: none;
    border-bottom: 1px solid var(--border);
    transform: translateX(-100%);
    transition: transform 200ms var(--ease-out);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-nav ul { gap: 0.25rem; }

  .nav-link {
    font-size: 0.8rem;
    padding: 0.6rem 0.75rem;
  }

  .main-content {
    padding: 2rem 1.25rem 4rem;
    width: 100%;
  }

  .hero-title { font-size: clamp(2rem, 9vw, 3rem); }

  .footer-inner { flex-direction: column; align-items: flex-start; gap: 0.25rem; }
}

@media (max-width: 375px) {
  .header-inner { padding: 0 1rem; }
  .main-content { padding: 1.5rem 1rem 3rem; }
  .hero-badge { font-size: 0.62rem; }
}