:root {
  --sky-50: #f0f9ff;
  --sky-100: #e0f2fe;
  --sky-600: #0284c7;
  --sky-700: #0369a1;
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --white: #ffffff;
  --emerald-50: #ecfdf5;
  --emerald-200: #a7f3d0;
  --emerald-800: #065f46;
  --amber-50: #fffbeb;
  --amber-200: #fde68a;
  --amber-900: #78350f;
  --rose-50: #fef2f2;
  --rose-200: #fecaca;
  --rose-800: #9f1239;
  --sidebar-width: 17.5rem;
  --topbar-height: 3.5rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--slate-800);
  background: linear-gradient(180deg, var(--slate-100) 0%, #e8eef4 100%);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--sky-600);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--sky-700);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--topbar-height);
  padding: 0 1.25rem;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(226, 232, 240, 0.95);
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  font-size: 1.125rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--slate-900);
  text-decoration: none;
}

.brand span {
  color: var(--sky-600);
}

.topbar_actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.topbar_link {
  display: none;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--slate-700);
  text-decoration: none;
}

.topbar_link:hover {
  color: var(--slate-900);
}

.menu_btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--slate-200);
  border-radius: 0.5rem;
  background: var(--white);
  color: var(--slate-700);
  cursor: pointer;
}

.layout {
  display: grid;
  grid-template-columns: 1fr;
  min-height: calc(100vh - var(--topbar-height));
}

.sidebar {
  display: none;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem 1rem 2rem;
  background: var(--white);
  border-right: 1px solid var(--slate-200);
}

.sidebar.is_open {
  display: flex;
  position: fixed;
  z-index: 25;
  top: var(--topbar-height);
  left: 0;
  right: 0;
  bottom: 0;
  overflow: auto;
}

.search {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--slate-300);
  border-radius: 0.6rem;
  background: var(--slate-50);
  color: var(--slate-900);
  font: inherit;
  font-size: 0.875rem;
}

.search:focus {
  outline: 2px solid rgba(2, 132, 199, 0.25);
  border-color: var(--sky-600);
  background: var(--white);
}

.nav_label {
  margin: 0 0 0.4rem;
  padding: 0 0.5rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.nav_list,
.page_toc {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav_list a,
.page_toc a {
  display: block;
  padding: 0.45rem 0.6rem;
  border-radius: 0.5rem;
  color: var(--slate-700);
  text-decoration: none;
  font-size: 0.925rem;
}

.nav_list a:hover,
.page_toc a:hover {
  background: var(--slate-100);
  color: var(--slate-900);
}

.nav_list a.is_active {
  background: var(--sky-50);
  color: var(--sky-700);
  font-weight: 650;
}

.nav_hint {
  display: block;
  margin-top: 0.1rem;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--slate-500);
}

.page_toc a {
  font-size: 0.8125rem;
  color: var(--slate-600);
}

.content {
  padding: 1.5rem 1.15rem 3.5rem;
}

.article {
  max-width: 46rem;
  margin: 0 auto;
}

h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.7rem, 3vw, 2.15rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--slate-900);
}

.lead {
  margin: 0 0 1.5rem;
  font-size: 1.125rem;
  color: var(--slate-600);
}

h2 {
  margin: 2rem 0 0.7rem;
  font-size: 1.25rem;
  line-height: 1.3;
  color: var(--slate-900);
}

h3 {
  margin: 1.4rem 0 0.45rem;
  font-size: 1.05rem;
  color: var(--slate-900);
}

p,
ul,
ol {
  margin: 0 0 1rem;
}

ul,
ol {
  padding-left: 1.2rem;
}

li + li {
  margin-top: 0.35rem;
}

.card,
.step,
.note,
.warn,
.ok {
  padding: 1rem 1.1rem;
  border-radius: 1rem;
  background: var(--white);
  border: 1px solid var(--slate-200);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.card + .card,
.step + .step {
  margin-top: 0.75rem;
}

.grid {
  display: grid;
  gap: 0.75rem;
}

.note {
  background: var(--sky-50);
  border-color: var(--sky-100);
}

.ok {
  background: var(--emerald-50);
  border-color: var(--emerald-200);
}

.warn {
  background: var(--amber-50);
  border-color: var(--amber-200);
}

.note p,
.ok p,
.warn p,
.card p,
.step p {
  margin-bottom: 0.5rem;
}

.note p:last-child,
.ok p:last-child,
.warn p:last-child,
.card p:last-child,
.step p:last-child {
  margin-bottom: 0;
}

.step {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.85rem;
}

.step_num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: var(--sky-600);
  color: var(--white);
  font-size: 0.85rem;
  font-weight: 700;
}

.step h3 {
  margin: 0.1rem 0 0.35rem;
}

.kicker {
  margin: 0 0 0.4rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sky-600);
}

.toc_cards a {
  display: block;
  height: 100%;
  padding: 1rem 1.1rem;
  border-radius: 1rem;
  background: var(--white);
  border: 1px solid var(--slate-200);
  color: inherit;
  text-decoration: none;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.toc_cards a:hover {
  border-color: #bae6fd;
  box-shadow: 0 0 0 1px #e0f2fe;
}

.toc_cards h2,
.toc_cards h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.toc_cards p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--slate-600);
}

.pill {
  display: inline-block;
  margin-bottom: 0.45rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--sky-50);
  color: var(--sky-700);
  font-size: 0.72rem;
  font-weight: 700;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.25rem;
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 0.9rem;
  overflow: hidden;
  font-size: 0.925rem;
}

th,
td {
  padding: 0.7rem 0.85rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--slate-100);
}

th {
  background: var(--slate-50);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--slate-600);
}

tr:last-child td {
  border-bottom: 0;
}

details.faq {
  padding: 0.15rem 0;
  border-bottom: 1px solid var(--slate-200);
}

details.faq summary {
  cursor: pointer;
  padding: 0.85rem 0;
  font-weight: 650;
  color: var(--slate-900);
  list-style: none;
}

details.faq summary::-webkit-details-marker {
  display: none;
}

details.faq summary::after {
  content: "+";
  float: right;
  color: var(--sky-600);
  font-weight: 700;
}

details.faq[open] summary::after {
  content: "−";
}

details.faq[open] {
  padding-bottom: 0.85rem;
}

.footer_nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--slate-200);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 0.9rem;
  border-radius: 0.6rem;
  background: var(--sky-600);
  color: var(--white);
  font-weight: 650;
  font-size: 0.9rem;
  text-decoration: none;
}

.btn:hover {
  background: #0ea5e9;
  color: var(--white);
}

.btn_ghost {
  background: var(--white);
  color: var(--slate-700);
  border: 1px solid var(--slate-300);
}

.btn_ghost:hover {
  background: var(--slate-50);
  color: var(--slate-900);
}

.muted {
  color: var(--slate-600);
}

.ui_name {
  font-weight: 650;
  color: var(--slate-900);
}

@media (min-width: 640px) {
  .grid.two {
    grid-template-columns: 1fr 1fr;
  }

  .topbar_link {
    display: inline;
  }
}

@media (min-width: 960px) {
  .menu_btn {
    display: none;
  }

  .layout {
    grid-template-columns: var(--sidebar-width) 1fr;
  }

  .sidebar,
  .sidebar.is_open {
    display: flex;
    position: sticky;
    top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
    overflow: auto;
  }

  .content {
    padding: 2.25rem 2.5rem 4rem;
  }
}

@media print {
  .topbar,
  .sidebar,
  .menu_btn,
  .footer_nav {
    display: none !important;
  }

  body {
    background: white;
  }

  .content {
    padding: 0;
  }
}