:root {
  color-scheme: light;
  --bg: #f6f4f1;
  --bg-elevated: #ffffff;
  --text: #1c1917;
  --text-muted: #57534e;
  --accent: #0d9488;
  --accent-hover: #0f766e;
  --border: #e7e5e4;
  --shadow: 0 1px 3px rgb(28 25 23 / 8%), 0 8px 24px rgb(28 25 23 / 6%);
  --font-sans: "Instrument Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --radius: 14px;
  --radius-sm: 10px;
  --header-gradient: linear-gradient(135deg, #f0fdfa 0%, #f6f4f1 48%, #fff7ed 100%);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0c0f12;
  --bg-elevated: #14191f;
  --text: #e7e5e4;
  --text-muted: #a8a29e;
  --accent: #2dd4bf;
  --accent-hover: #5eead4;
  --border: #292524;
  --shadow: 0 1px 3px rgb(0 0 0 / 35%), 0 12px 40px rgb(0 0 0 / 28%);
  --header-gradient: linear-gradient(135deg, #0f172a 0%, #0c0f12 50%, #134e4a 100%);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  transition: background 0.35s ease, color 0.25s ease;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.site-header {
  background: var(--header-gradient);
  border-bottom: 1px solid var(--border);
  padding: clamp(1.5rem, 4vw, 2.75rem) clamp(1.25rem, 5vw, 3rem);
}

.header-inner {
  max-width: 52rem;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.25rem;
}

.header-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.segmented {
  display: inline-flex;
  padding: 3px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
}

.seg-btn {
  border: none;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.seg-btn:hover {
  color: var(--text);
}

.seg-btn.is-active {
  background: var(--accent);
  color: #fff;
}

.seg-btn:focus-visible {
  outline: 2px solid var(--accent-hover);
  outline-offset: 2px;
}

.brand-kicker {
  margin: 0 0 0.35rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.brand-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.brand-meta {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.5rem 0.85rem 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease, transform 0.15s ease;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.theme-toggle:active {
  transform: scale(0.98);
}

.theme-toggle-track {
  position: relative;
  width: 2.75rem;
  height: 1.5rem;
  border-radius: 999px;
  background: var(--border);
  flex-shrink: 0;
  transition: background 0.25s ease;
}

[data-theme="dark"] .theme-toggle-track {
  background: #334155;
}

.theme-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: calc(1.5rem - 6px);
  height: calc(1.5rem - 6px);
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgb(0 0 0 / 20%);
  transition: transform 0.28s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.2s ease;
}

[data-theme="dark"] .theme-toggle-thumb {
  transform: translateX(1.25rem);
  background: #fbbf24;
}

.theme-toggle-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
}

.theme-toggle-label > span {
  display: none;
}

html[data-theme="light"][data-ui-lang="ru"] .theme-toggle-label .label-light,
html[data-theme="light"][data-ui-lang="en"] .theme-toggle-label .label-light-en {
  display: inline;
}

html[data-theme="dark"][data-ui-lang="ru"] .theme-toggle-label .label-dark,
html[data-theme="dark"][data-ui-lang="en"] .theme-toggle-label .label-dark-en {
  display: inline;
}

.content {
  max-width: 52rem;
  margin: 0 auto;
  padding: clamp(1.25rem, 4vw, 2rem) clamp(1.25rem, 5vw, 3rem) 3.5rem;
}

.policy-article[hidden] {
  display: none !important;
}

.doc-meta {
  margin: 0 0 1.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.section {
  margin-bottom: 2.25rem;
}

.section h2 {
  margin: 0 0 1rem;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.section p {
  margin: 0 0 1rem;
  color: var(--text);
}

.section p:last-child {
  margin-bottom: 0;
}

.section ul {
  margin: 0 0 1rem;
  padding-left: 1.35rem;
}

.section li {
  margin-bottom: 0.6rem;
}

.section li:last-child {
  margin-bottom: 0;
}

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

.section a:hover {
  color: var(--accent-hover);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.95em;
  word-break: break-all;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem clamp(1.25rem, 5vw, 3rem) 2rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.site-footer p {
  margin: 0;
}

.site-footer p[hidden] {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}