:root {
  --guide-bg: #080a14;
  --guide-panel: rgba(17, 21, 36, 0.82);
  --guide-panel-solid: #111524;
  --guide-panel-soft: rgba(20, 25, 43, 0.72);
  --guide-blue: #3b82f6;
  --guide-blue-bright: #60a5fa;
  --guide-blue-pale: #bfdbfe;
  --guide-green: #34d399;
  --guide-text: #eeeef2;
  --guide-muted: #9a9bad;
  --guide-dim: #8a8ca0;
  --guide-line: rgba(147, 197, 253, 0.14);
  --guide-border: rgba(255, 255, 255, 0.08);
  --guide-font-display: "Unbounded", system-ui, sans-serif;
  --guide-font-body: "Onest", system-ui, sans-serif;
  --guide-font-mono: "JetBrains Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--guide-text);
  font-family: var(--guide-font-body);
  -webkit-font-smoothing: antialiased;
  background:
    radial-gradient(circle at 12% 4%, rgba(59, 130, 246, 0.17), transparent 28rem),
    radial-gradient(circle at 92% 72%, rgba(37, 99, 235, 0.11), transparent 34rem),
    linear-gradient(180deg, #080a14 0%, #0a0e1a 52%, #080a14 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.2;
  background-image:
    linear-gradient(rgba(96, 165, 250, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(96, 165, 250, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 72%);
}

a { color: inherit; text-decoration: none; }
button, input { font: inherit; }

.guide-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(24px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid rgba(96, 165, 250, 0.11);
  background: rgba(8, 10, 20, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.guide-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font: 700 13px/1 var(--guide-font-display);
  letter-spacing: -0.02em;
}

.guide-brand-shield {
  width: 28px;
  height: 32px;
  flex: 0 0 auto;
  color: var(--guide-blue-bright);
  filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.4));
}

.guide-nav-meta {
  color: var(--guide-muted);
  font-size: 13px;
}

.guide-shell,
.selector-shell {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.selector-shell {
  display: grid;
  align-content: center;
  min-height: calc(100vh - 68px);
  padding: 64px 0 88px;
}

.guide-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  color: var(--guide-blue-bright);
  font: 600 11px/1 var(--guide-font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.guide-eyebrow::before { content: "//"; opacity: 0.55; }

.selector-copy { max-width: 760px; }

.selector-copy h1,
.guide-hero h1 {
  margin: 0;
  max-width: 900px;
  font-family: var(--guide-font-display);
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 1.06;
}

.selector-copy h1 { font-size: clamp(36px, 6.2vw, 72px); }
.guide-hero h1 { font-size: clamp(34px, 5vw, 60px); }

.selector-copy p,
.guide-hero p {
  margin: 22px 0 0;
  color: var(--guide-muted);
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.6;
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 56px;
}

.device-card {
  position: relative;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  overflow: hidden;
  border: 1px solid var(--guide-border);
  border-radius: 18px;
  background: linear-gradient(155deg, rgba(20, 25, 43, 0.94), rgba(11, 14, 25, 0.9));
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.device-card::after {
  content: "";
  position: absolute;
  right: -55px;
  bottom: -65px;
  width: 160px;
  height: 160px;
  border: 1px solid rgba(96, 165, 250, 0.1);
  border-radius: 50%;
  box-shadow: 0 0 0 22px rgba(59, 130, 246, 0.025), 0 0 0 44px rgba(59, 130, 246, 0.015);
  transition: transform 220ms ease, border-color 220ms ease;
}

.device-card:hover {
  transform: translateY(-5px);
  border-color: rgba(96, 165, 250, 0.38);
  background: linear-gradient(155deg, rgba(26, 35, 60, 0.96), rgba(12, 16, 29, 0.94));
}

.device-card:hover::after { transform: scale(1.08); border-color: rgba(96, 165, 250, 0.28); }
.device-card:focus-visible { outline: 3px solid var(--guide-blue-bright); outline-offset: 4px; }

.device-icon {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(96, 165, 250, 0.24);
  border-radius: 16px;
  color: var(--guide-blue-pale);
  background: rgba(59, 130, 246, 0.1);
}

.device-icon svg { width: 32px; height: 32px; fill: currentColor; }
.device-name { position: relative; z-index: 1; display: block; font-size: 23px; font-weight: 700; }
.device-time { display: block; margin-top: 7px; color: var(--guide-muted); font: 500 12px/1.4 var(--guide-font-mono); }
.device-arrow { position: absolute; right: 22px; bottom: 23px; z-index: 2; color: var(--guide-blue-bright); font-size: 22px; }

.selector-note {
  margin: 24px 0 0;
  color: var(--guide-dim);
  font-size: 13px;
}

.guide-shell { padding: 56px 0 110px; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--guide-muted);
  font-size: 14px;
  transition: color 160ms ease;
}

.back-link:hover { color: var(--guide-text); }
.back-link:focus-visible,
.step-nav a:focus-visible,
.download-button:focus-visible,
.footer a:focus-visible,
summary:focus-visible { outline: 3px solid var(--guide-blue-bright); outline-offset: 4px; border-radius: 6px; }

.guide-hero { padding: 56px 0 64px; border-bottom: 1px solid var(--guide-border); }
.guide-hero p { max-width: 660px; }

.guide-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.guide-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--guide-border);
  border-radius: 999px;
  color: var(--guide-muted);
  background: rgba(255, 255, 255, 0.025);
  font-size: 12px;
}

.guide-pill-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--guide-green); box-shadow: 0 0 12px rgba(52, 211, 153, 0.45); }

.guide-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
  padding-top: 54px;
}

.step-nav {
  position: sticky;
  top: 102px;
  padding-left: 14px;
  border-left: 1px solid var(--guide-line);
}

.step-nav-label { margin: 0 0 17px; color: var(--guide-dim); font: 600 10px/1 var(--guide-font-mono); letter-spacing: 0.12em; text-transform: uppercase; }
.step-nav a { display: block; position: relative; padding: 8px 0 8px 16px; color: var(--guide-muted); font-size: 13px; line-height: 1.35; transition: color 160ms ease; }
.step-nav a::before { content: ""; position: absolute; left: -18px; top: 14px; width: 7px; height: 7px; border: 2px solid var(--guide-blue); border-radius: 50%; background: var(--guide-bg); }
.step-nav a:hover { color: var(--guide-text); }

.steps { position: relative; min-width: 0; }
.steps::before { content: ""; position: absolute; left: 23px; top: 34px; bottom: 34px; width: 1px; background: linear-gradient(var(--guide-blue), rgba(96, 165, 250, 0.08)); box-shadow: 0 0 16px rgba(59, 130, 246, 0.25); }

.step-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(290px, 0.85fr);
  gap: 34px;
  min-height: 310px;
  margin-bottom: 26px;
  padding: 34px 34px 34px 72px;
  scroll-margin-top: 92px;
  border: 1px solid var(--guide-border);
  border-radius: 20px;
  background: linear-gradient(140deg, rgba(18, 23, 40, 0.93), rgba(11, 14, 25, 0.84));
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.16);
}

.step-number {
  position: absolute;
  left: 10px;
  top: 28px;
  z-index: 2;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(96, 165, 250, 0.5);
  border-radius: 50%;
  color: var(--guide-blue-pale);
  background: #0c1220;
  box-shadow: 0 0 0 7px rgba(59, 130, 246, 0.08), 0 0 22px rgba(59, 130, 246, 0.18);
  font: 600 11px/1 var(--guide-font-mono);
}

.step-copy { align-self: center; }
.step-kicker { margin-bottom: 11px; color: var(--guide-blue-bright); font: 600 10px/1 var(--guide-font-mono); letter-spacing: 0.11em; text-transform: uppercase; }
.step-copy h2 { margin: 0; font-family: var(--guide-font-display); font-size: clamp(22px, 3vw, 31px); letter-spacing: -0.035em; line-height: 1.18; }
.step-copy p { margin: 16px 0 0; color: var(--guide-muted); font-size: 15px; line-height: 1.68; }
.step-copy strong { color: var(--guide-text); font-weight: 600; }

.download-stack { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
.download-button { display: inline-flex; align-items: center; justify-content: center; min-height: 43px; padding: 0 16px; border: 1px solid rgba(96, 165, 250, 0.3); border-radius: 10px; color: #fff; background: rgba(59, 130, 246, 0.14); font-size: 13px; font-weight: 600; transition: background 160ms ease, border-color 160ms ease; }
.download-button:hover { border-color: rgba(96, 165, 250, 0.56); background: rgba(59, 130, 246, 0.23); }
.download-button.secondary { color: var(--guide-muted); border-color: var(--guide-border); background: rgba(255, 255, 255, 0.025); }

.ui-demo {
  align-self: stretch;
  min-height: 230px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  border: 1px solid rgba(96, 165, 250, 0.14);
  border-radius: 16px;
  color: #f7f7fb;
  background: #1e2152;
  box-shadow: inset 0 0 50px rgba(0, 0, 0, 0.16);
}

.ui-topbar { height: 43px; display: flex; align-items: center; justify-content: space-between; padding: 0 14px; border-bottom: 1px solid rgba(255,255,255,.09); color: rgba(255,255,255,.72); font-size: 10px; }
.ui-brand { font-weight: 700; color: #fff; }
.ui-body { padding: 14px; }
.ui-row { display: flex; align-items: center; gap: 10px; min-height: 50px; padding: 9px 10px; border-bottom: 1px solid rgba(255,255,255,.1); }
.ui-row:last-child { border-bottom: 0; }
.ui-flag { width: 27px; height: 19px; display: grid; place-items: center; border-radius: 4px; background: rgba(255,255,255,.94); font-size: 14px; }
.ui-title { display: block; font-size: 12px; font-weight: 700; }
.ui-sub { display: block; margin-top: 3px; color: rgba(255,255,255,.52); font-size: 9px; }
.ui-chevron { margin-left: auto; color: rgba(255,255,255,.28); font-size: 18px; }
.ui-focus { position: relative; border: 1px solid rgba(147, 197, 253, 0.9) !important; border-radius: 9px; background: rgba(59,130,246,.2); box-shadow: 0 0 0 4px rgba(59,130,246,.12), 0 0 24px rgba(59,130,246,.2); }
.ui-focus::after { content: "нажмите"; position: absolute; right: 8px; top: -9px; padding: 3px 6px; border-radius: 4px; color: #07101f; background: var(--guide-blue-pale); font: 700 8px/1 var(--guide-font-mono); text-transform: uppercase; }
.ui-input { width: 100%; min-height: 43px; padding: 12px; overflow: hidden; border: 1px solid rgba(147,197,253,.65); border-radius: 9px; color: rgba(255,255,255,.68); background: rgba(5,7,15,.34); font: 9px/1.5 var(--guide-font-mono); white-space: nowrap; text-overflow: ellipsis; }
.ui-button { min-height: 40px; display: grid; place-items: center; margin-top: 10px; border-radius: 9px; color: #fff; background: #3b82f6; font-size: 11px; font-weight: 700; }
.ui-plus { width: 54px; height: 54px; display: grid; place-items: center; margin: auto; border: 1px solid rgba(147,197,253,.75); border-radius: 50%; color: #fff; background: rgba(59,130,246,.3); box-shadow: 0 0 0 8px rgba(59,130,246,.1), 0 0 30px rgba(59,130,246,.35); font-size: 30px; font-weight: 300; }
.ui-toggle { width: 62px; height: 32px; position: relative; margin: 14px auto 0; border-radius: 999px; background: #3b82f6; box-shadow: 0 0 24px rgba(59,130,246,.4); }
.ui-toggle::after { content: ""; position: absolute; top: 4px; right: 4px; width: 24px; height: 24px; border-radius: 50%; background: #fff; }
.ui-status { text-align: center; }
.ui-status-icon { width: 66px; height: 66px; display: grid; place-items: center; margin: 0 auto 14px; border: 1px solid rgba(52,211,153,.55); border-radius: 50%; color: var(--guide-green); background: rgba(52,211,153,.1); box-shadow: 0 0 32px rgba(52,211,153,.16); font-size: 26px; }
.ui-status b { display: block; font-size: 13px; }
.ui-status span { display: block; margin-top: 5px; color: rgba(255,255,255,.55); font-size: 9px; }
.ui-system { margin: 0 14px; padding: 18px; border-radius: 13px; color: #151720; background: #f5f5f7; box-shadow: 0 16px 40px rgba(0,0,0,.28); }
.ui-system-title { font-size: 13px; font-weight: 700; text-align: center; }
.ui-system p { margin: 8px 0 14px; color: #63656e; font-size: 10px; line-height: 1.4; text-align: center; }
.ui-system-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.ui-system-actions span { padding: 8px; border-radius: 7px; background: #e5e7eb; color: #6b7280; font-size: 10px; text-align: center; }
.ui-system-actions .allow { color: #fff; background: #2563eb; font-weight: 700; }

.guide-note { margin-top: 18px; padding: 14px 16px; border: 1px solid rgba(96,165,250,.18); border-radius: 11px; color: var(--guide-muted); background: rgba(59,130,246,.065); font-size: 13px; line-height: 1.55; }
.guide-note strong { color: var(--guide-blue-pale); }

.reference-section { margin-top: 72px; scroll-margin-top: 90px; }
.reference-section > h2 { margin: 0 0 28px; font-family: var(--guide-font-display); font-size: clamp(26px, 4vw, 38px); letter-spacing: -0.04em; }
.reference-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.reference-card { padding: 24px; border: 1px solid var(--guide-border); border-radius: 16px; background: var(--guide-panel-soft); }
.reference-card-label { color: var(--guide-blue-bright); font: 600 10px/1 var(--guide-font-mono); letter-spacing: .1em; text-transform: uppercase; }
.reference-card h3 { margin: 13px 0 0; font-size: 18px; }
.reference-card p { margin: 11px 0 0; color: var(--guide-muted); font-size: 14px; line-height: 1.6; }

.faq-list { display: grid; gap: 10px; }
.faq-list details { border: 1px solid var(--guide-border); border-radius: 13px; background: rgba(17,21,36,.76); }
.faq-list details[open] { border-color: rgba(96,165,250,.22); }
.faq-list summary { position: relative; padding: 18px 52px 18px 20px; cursor: pointer; list-style: none; font-size: 15px; font-weight: 600; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 20px; top: 13px; color: var(--guide-blue-bright); font-size: 25px; font-weight: 300; transition: transform 160ms ease; }
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-answer { padding: 0 52px 20px 20px; color: var(--guide-muted); font-size: 14px; line-height: 1.65; }

.footer {
  position: relative;
  background:
    radial-gradient(ellipse 75% 55% at 50% 120%, rgba(37, 99, 235, 0.14) 0%, transparent 62%),
    linear-gradient(180deg,
      rgba(8, 10, 24, 0) 0%,
      rgba(8, 10, 24, 0) 18%,
      rgba(8, 10, 24, 0.35) 45%,
      rgba(7, 10, 26, 0.72) 70%,
      #06091c 88%,
      #05091e 100%);
  padding: 64px 40px 48px;
}

.footer-wordmark {
  display: block;
  width: 100%;
  height: auto;
  opacity: 0.08;
}

.footer-wordmark text {
  font-family: var(--guide-font-display);
  font-size: 100px;
  font-weight: 900;
  fill: #fff;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px 32px;
  margin-top: 48px;
}

.footer-nav a {
  color: #9494a8;
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-nav a:hover { color: #fff; }

.footer-disclaimer {
  max-width: 720px;
  margin: 20px auto 0;
  color: #55556a;
  font-size: 12px;
  line-height: 1.6;
  text-align: center;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px 14px;
  margin-top: 12px;
  color: #55556a;
  font-size: 13px;
}

.footer-meta a {
  color: #55556a;
  transition: color 0.2s ease;
}

.footer-meta a:hover { color: #fff; }

.footer-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.5;
}

@media (max-width: 980px) {
  .device-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-layout { grid-template-columns: 1fr; gap: 28px; }
  .step-nav { position: static; display: flex; gap: 5px; overflow-x: auto; padding: 0 0 10px; border-left: 0; scrollbar-width: none; }
  .step-nav::-webkit-scrollbar { display: none; }
  .step-nav-label { display: none; }
  .step-nav a { flex: 0 0 auto; padding: 8px 12px; border: 1px solid var(--guide-border); border-radius: 999px; background: rgba(255,255,255,.025); font-size: 12px; }
  .step-nav a::before { display: none; }
  .step-card { grid-template-columns: minmax(0, 1fr) minmax(260px, .8fr); padding-left: 68px; }
}

@media (max-width: 720px) {
  html { scroll-padding-top: 78px; }
  .guide-nav { height: 60px; padding: 0 20px; }
  .guide-nav-meta { display: none; }
  .guide-shell, .selector-shell { width: min(100% - 32px, 620px); }
  .selector-shell { min-height: calc(100vh - 60px); padding: 46px 0 62px; align-content: start; }
  .selector-copy p, .guide-hero p { font-size: 16px; }
  .device-grid { grid-template-columns: 1fr; gap: 10px; margin-top: 38px; }
  .device-card { min-height: 112px; padding: 18px; flex-direction: row; align-items: center; justify-content: flex-start; gap: 16px; }
  .device-icon { width: 50px; height: 50px; flex: 0 0 auto; }
  .device-icon svg { width: 27px; height: 27px; }
  .device-name { font-size: 20px; }
  .device-arrow { right: 18px; bottom: auto; top: 43px; }
  .guide-shell { padding-top: 34px; }
  .guide-hero { padding: 42px 0 48px; }
  .guide-layout { padding-top: 30px; }
  .steps::before { left: 17px; }
  .step-card { grid-template-columns: 1fr; gap: 24px; min-height: 0; margin-bottom: 18px; padding: 28px 18px 20px 52px; border-radius: 16px; }
  .step-number { left: 3px; top: 25px; }
  .ui-demo { min-height: 220px; }
  .reference-section { margin-top: 54px; }
  .reference-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .footer { padding: 44px 20px 40px; }
  .footer-nav { gap: 12px 22px; margin-top: 32px; }
  .footer-nav a { font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.001ms !important; animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
}