/* fragment-api.io docs — DESIGN.md (Vercel + taste-skill) */
:root {
  --bg: #ffffff;
  --bg-subtle: #fafafa;
  --sidebar-bg: #ffffff;
  --text: #171717;
  --text-secondary: #4d4d4d;
  --text-muted: #666666;
  --text-faint: #808080;
  --line: rgba(0, 0, 0, 0.08);
  --line-solid: #ebebeb;
  --accent: #0a72ef;
  --accent-soft: #ebf5ff;
  --accent-text: #0068d6;
  --live: #ff5b4f;
  --live-soft: #fff1f0;
  --code-inline-bg: #fafafa;
  --code-block-bg: #171717;
  --code-block-fg: #fafafa;
  --code-muted: #808080;
  --get: #346538;
  --get-soft: #edf3ec;
  --post: #956400;
  --post-soft: #fbf3db;
  --err: #9f2f2d;
  --err-soft: #fdebec;
  --header-bg: rgba(255, 255, 255, 0.92);
  --shadow-border: 0 0 0 1px rgba(0, 0, 0, 0.08);
  --shadow-card: 0 0 0 1px rgba(0, 0, 0, 0.08), 0 2px 2px rgba(0, 0, 0, 0.04), 0 12px 24px -16px rgba(0, 0, 0, 0.08);
  --focus: 0 0 0 2px #fff, 0 0 0 4px hsla(212, 100%, 48%, 1);
  --radius: 6px;
  --radius-card: 10px;
  --sidebar-w: 272px;
  --header-h: 64px;
  --sans: "Geist", "Helvetica Neue", Helvetica, sans-serif;
  --mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "liga" 1;
}

html[lang="en"] .ru { display: none !important; }
html[lang="ru"] .en { display: none !important; }

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

/* Top bar — landing nav pattern */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 1.25rem;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: none;
  transition: box-shadow 160ms ease;
}

.topbar.is-stuck { box-shadow: var(--shadow-border); }

.menu-toggle {
  display: none;
  border: none;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  place-items: center;
  font-size: 1.1rem;
  line-height: 1;
}

.menu-toggle:hover { background: var(--bg-subtle); }
.menu-toggle:focus-visible { outline: none; box-shadow: var(--focus); }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  min-width: 0;
}

.brand:hover { color: var(--text); text-decoration: none; }

.brand-mark {
  width: 1.15rem;
  height: 1.15rem;
  display: block;
  flex-shrink: 0;
  color: var(--text);
}

.brand-mark img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
}

.brand-meta {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.topbar-spacer { flex: 1; }

.topbar-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.topbar-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
}

.topbar-links a:hover { color: var(--text-muted); }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-shrink: 0;
}

.lang {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.lang button {
  border: none;
  background: transparent;
  color: var(--text-faint);
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  padding: 0.2rem;
  cursor: pointer;
}

.lang button.active { color: var(--text); }
.lang button:hover { color: var(--text); }
.lang button:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 4px; }
.lang-sep { color: var(--line-solid); user-select: none; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius);
  border: none;
  text-decoration: none;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, transform 120ms ease;
}

.btn:focus-visible { outline: none; box-shadow: var(--focus); }
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--text);
  color: #fff;
}

.btn-primary:hover { background: #000; color: #fff; text-decoration: none; }

/* Layout */
.shell {
  display: flex;
  padding-top: var(--header-h);
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  top: var(--header-h);
  left: 0;
  width: var(--sidebar-w);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  background: var(--sidebar-bg);
  box-shadow: inset -1px 0 0 var(--line-solid);
  padding: 1rem 0.75rem 2rem;
  z-index: 90;
  transition: transform 0.2s var(--ease);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--header-h);
  background: rgba(0, 0, 0, 0.35);
  z-index: 80;
}

.content-wrap {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-width: 0;
  background:
    radial-gradient(ellipse 50% 30% at 50% 0%, rgba(10, 114, 239, 0.035), transparent 70%);
}

.page-toolbar {
  position: sticky;
  top: var(--header-h);
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 0.75rem 2rem;
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  box-shadow: inset 0 -1px 0 var(--line-solid);
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: var(--sans);
  color: var(--text-muted);
  background: var(--bg);
  box-shadow: var(--shadow-border);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: background 160ms ease, color 160ms ease;
}

.tool-btn:hover {
  color: var(--text);
  background: var(--bg-subtle);
  text-decoration: none;
}

.tool-btn.primary {
  background: var(--text);
  color: #fff;
  box-shadow: none;
}

.tool-btn.primary:hover {
  background: #000;
  color: #fff;
}

main {
  max-width: 52rem;
  padding: 2.5rem 2rem 5rem;
  margin: 0 auto;
}

/* Sidebar nav */
.nav-group { margin-bottom: 0.25rem; }

.nav-group-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: none;
  background: transparent;
  color: var(--text);
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  border-radius: var(--radius);
  text-align: left;
}

.nav-group-title:hover { background: var(--bg-subtle); }
.nav-group-title:focus-visible { outline: none; box-shadow: var(--focus); }

.nav-group-title .chevron {
  transition: transform 0.2s var(--ease);
  color: var(--text-faint);
  font-size: 0.7rem;
}

.nav-group.collapsed .chevron { transform: rotate(-90deg); }
.nav-group.collapsed .nav-items { display: none; }

.nav-items { list-style: none; padding: 0 0 0.25rem 0.35rem; }

.nav-items a {
  display: block;
  padding: 0.4rem 0.65rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  border-radius: var(--radius);
  line-height: 1.4;
  text-decoration: none;
}

.nav-items a:hover {
  color: var(--text);
  background: var(--bg-subtle);
  text-decoration: none;
}

.nav-items a.active {
  color: var(--accent-text);
  background: var(--accent-soft);
  font-weight: 500;
}

.method-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  margin-right: 0.35rem;
  vertical-align: middle;
  text-transform: uppercase;
}

.method-tag.get { background: var(--get-soft); color: var(--get); }
.method-tag.post { background: var(--post-soft); color: var(--post); }

/* Content */
.doc-section { margin-bottom: 3rem; scroll-margin-top: calc(var(--header-h) + 3.5rem); }

h1.page-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.page-alias {
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  box-shadow: inset 0 -1px 0 var(--line-solid);
  scroll-margin-top: calc(var(--header-h) + 3.5rem);
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 1.75rem 0 0.75rem;
  color: var(--text);
}

h4 {
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  margin: 1.25rem 0 0.5rem;
}

p, li { color: var(--text-secondary); margin-bottom: 0.75rem; }
ul, ol { padding-left: 1.25rem; margin-bottom: 1rem; }

.lead {
  font-size: 1.0625rem;
  max-width: 40rem;
  color: var(--text-secondary);
}

.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.65rem;
  margin: 1.25rem 0;
}

.info-card {
  background: var(--bg);
  box-shadow: var(--shadow-card);
  border-radius: var(--radius-card);
  padding: 0.9rem 1rem;
}

.info-card b {
  display: block;
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 0.4rem;
}

.info-card code,
.info-card span,
.info-card a {
  font-size: 0.8125rem;
  color: var(--text);
  word-break: break-all;
}

hr.divider {
  border: none;
  height: 1px;
  background: var(--line-solid);
  margin: 2rem 0;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.875rem;
  box-shadow: var(--shadow-border);
  border-radius: var(--radius-card);
  overflow: hidden;
}

th, td {
  padding: 0.65rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--line-solid);
}

th {
  background: var(--bg-subtle);
  color: var(--text);
  font-weight: 600;
  font-size: 0.8125rem;
}

tr:last-child td { border-bottom: none; }
td { color: var(--text-secondary); }

/* Code */
code {
  font-family: var(--mono);
  font-size: 0.84em;
  background: var(--code-inline-bg);
  box-shadow: var(--shadow-border);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  color: var(--text);
}

.code-block {
  position: relative;
  margin: 0.75rem 0 1.25rem;
}

.code-block pre {
  background: var(--code-block-bg);
  color: var(--code-block-fg);
  border-radius: var(--radius-card);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.55;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.12), 0 8px 24px -12px rgba(0, 0, 0, 0.25);
}

.copy-code {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  font-family: var(--sans);
  font-weight: 500;
  border: none;
  background: rgba(255, 255, 255, 0.08);
  color: var(--code-muted);
  border-radius: var(--radius);
  cursor: pointer;
}

.copy-code:hover { color: #fff; background: rgba(255, 255, 255, 0.14); }
.copy-code:focus-visible { outline: none; box-shadow: var(--focus); }

/* Endpoint card */
.endpoint-card {
  box-shadow: var(--shadow-card);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  margin: 1.5rem 0;
  background: var(--bg);
  scroll-margin-top: calc(var(--header-h) + 3.5rem);
}

.endpoint-path {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.9375rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
  color: var(--text);
  letter-spacing: -0.01em;
}

.method-badge {
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.method-badge.get { background: var(--get-soft); color: var(--get); }
.method-badge.post { background: var(--post-soft); color: var(--post); }

.status-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin: 1rem 0 0.4rem;
}

.status-200, .status-201 { color: var(--get); }
.status-400, .status-402 { color: var(--post); }
.status-401, .status-404 { color: var(--err); }

.example-tabs {
  display: flex;
  gap: 0.4rem;
  margin: 0.75rem 0 0;
}

.example-tab {
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.25rem 0.55rem;
  border-radius: 9999px;
  background: var(--accent-soft);
  color: var(--accent-text);
}

.callout {
  background: var(--accent-soft);
  box-shadow: var(--shadow-border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-card);
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
}

.callout h3 {
  margin-top: 0;
  color: var(--accent-text);
}

.site-footer {
  max-width: 52rem;
  margin: 0 auto;
  padding: 1.5rem 2rem 3rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  box-shadow: inset 0 1px 0 var(--line-solid);
}

.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 200;
  padding: 0.65rem 1rem;
  background: var(--text);
  color: #fff;
  border-radius: var(--radius);
  font-size: 0.8125rem;
  font-weight: 500;
  opacity: 0;
  transform: translateY(8px);
  transition: 200ms var(--ease);
  pointer-events: none;
}

.toast.show { opacity: 1; transform: translateY(0); }

@media (max-width: 960px) {
  :root { --header-h: 56px; }
  .menu-toggle { display: grid; }
  .topbar-links { display: none; }
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; }
  .content-wrap { margin-left: 0; }
  main, .site-footer { padding-left: 1.25rem; padding-right: 1.25rem; }
  .page-toolbar { padding-left: 1rem; padding-right: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .sidebar, .toast { transition: none; }
}