/* ArtUp Labs — shared stylesheet. No external fonts, no CDNs. */

:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --surface: #ffffff;
  --text: #172b4d;
  --text-muted: #505f79;
  --border: #dfe1e6;
  --accent: #0b5cd5;
  --accent-hover: #0847a6;
  --accent-contrast: #ffffff;
  --accent-soft: #e9f2ff;
  --todo-bg: #fff4d6;
  --todo-text: #6b4e00;
  --radius: 10px;
  --maxw: 72rem;
  --readw: 46rem;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --bg-soft: #181c22;
    --surface: #1d2229;
    --text: #e3e8ef;
    --text-muted: #a3adbb;
    --border: #2f3640;
    --accent: #6ea8ff;
    --accent-hover: #93bfff;
    --accent-contrast: #0b1320;
    --accent-soft: #1b2a42;
    --todo-bg: #3a3014;
    --todo-text: #f5d98a;
  }
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
}

a { color: var(--accent); text-underline-offset: 0.15em; }
a:hover { color: var(--accent-hover); }
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  z-index: 10;
}
.skip-link:focus { left: 1rem; }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}
.brand {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.brand-mark {
  width: 1.75rem;
  height: 1.75rem;
  flex: none;
  display: block;
  border-radius: 7px;
}
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
}
.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] { color: var(--text); text-decoration: underline; }

/* Hero */
.hero {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  padding: 4rem 0 3.5rem;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 0.75rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.15;
  margin: 0 0 1rem;
  max-width: 20ch;
}
.hero .lead {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 40rem;
  margin: 0 0 2rem;
}
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.btn {
  display: inline-block;
  padding: 0.7rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--accent);
}
.btn-primary { background: var(--accent); color: var(--accent-contrast); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--accent-contrast); }
.btn-secondary { background: transparent; color: var(--accent); }
.btn-secondary:hover { background: var(--accent-soft); }

/* Sections */
.section { padding: 3.5rem 0; }
.section h2 { font-size: 1.75rem; margin: 0 0 0.5rem; }
.section .section-lead { color: var(--text-muted); margin: 0 0 2rem; max-width: 40rem; }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.card h3 { margin: 0 0 0.5rem; font-size: 1.15rem; }
.card p { margin: 0; color: var(--text-muted); }

.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.facts li {
  border-left: 3px solid var(--accent);
  padding: 0.25rem 0 0.25rem 0.9rem;
  color: var(--text-muted);
}
.facts strong { display: block; color: var(--text); }

.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.link-grid a {
  display: block;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
}
.link-grid a:hover { border-color: var(--accent); }
.link-grid span { display: block; color: var(--text-muted); font-size: 0.9rem; }

/* Documents (legal, security, support) */
.doc {
  max-width: var(--readw);
  margin: 0 auto;
  padding: 3rem 1rem 4rem;
}
.doc h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); line-height: 1.2; margin: 0 0 0.5rem; }
.doc h2 {
  font-size: 1.35rem;
  margin: 2.5rem 0 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.doc h3 { font-size: 1.1rem; margin: 1.75rem 0 0.5rem; }
.doc p, .doc li { max-width: 70ch; }
.doc li + li { margin-top: 0.35rem; }
.meta { color: var(--text-muted); font-size: 0.95rem; margin: 0 0 1.5rem; }

.notice {
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}
.notice p { margin: 0; }
.notice p + p { margin-top: 0.5rem; }

.toc {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0 0;
}
.toc h2 { border: 0; margin: 0 0 0.5rem; padding: 0; font-size: 1rem; }
.toc ol { margin: 0; padding-left: 1.25rem; }

.todo {
  background: var(--todo-bg);
  color: var(--todo-text);
  padding: 0.05rem 0.35rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.95em;
}

.table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
caption { text-align: left; padding: 0.75rem 1rem 0; font-weight: 600; }
th, td {
  text-align: left;
  vertical-align: top;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border);
}
th { background: var(--bg-soft); font-weight: 600; }
tr:last-child td { border-bottom: 0; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05rem 0.3rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 2rem 0;
}
.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem 2rem;
}
.site-footer p { margin: 0 0 0.35rem; }
.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}

@media (max-width: 40rem) {
  body { font-size: 1rem; }
  .hero { padding: 2.75rem 0 2.5rem; }
  .section { padding: 2.5rem 0; }
  .doc { padding-top: 2rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}

@media print {
  .site-header, .site-footer, .skip-link, .toc { display: none; }
  body { background: #fff; color: #000; }
  a { color: #000; }
}

/* Product pages (ArtUp Export) */
:root {
  --glow-a: rgba(11, 92, 213, 0.14);
  --glow-b: rgba(124, 92, 255, 0.10);
  --shadow-lg: 0 30px 60px -24px rgba(9, 30, 66, 0.35), 0 2px 6px rgba(9, 30, 66, 0.08);
  --code-bg: #f5f7fa;
  --ok: #1f845a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --glow-a: rgba(110, 168, 255, 0.16);
    --glow-b: rgba(148, 112, 255, 0.12);
    --shadow-lg: 0 30px 60px -24px rgba(0, 0, 0, 0.7), 0 2px 6px rgba(0, 0, 0, 0.4);
    --code-bg: #161a20;
    --ok: #4bce97;
  }
}

.hero-product {
  background:
    radial-gradient(60rem 28rem at 105% -10%, var(--glow-a), transparent 60%),
    radial-gradient(50rem 26rem at -10% 110%, var(--glow-b), transparent 60%),
    var(--bg-soft);
  padding-bottom: 0;
  overflow: hidden;
}
.hero-product .hero-head { display: flex; gap: 1.25rem; align-items: flex-start; }
.hero-product .app-icon { width: 3.5rem; height: 3.5rem; flex: none; margin-top: 0.35rem; filter: drop-shadow(0 6px 14px rgba(24, 104, 219, 0.35)); }
.hero-product h1 { max-width: 22ch; }
.hero-product .shot { margin-top: 3rem; margin-bottom: -1px; }
.hero-product .frame { border-bottom-left-radius: 0; border-bottom-right-radius: 0; }

.pills { list-style: none; padding: 0; margin: 1.25rem 0 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.pills li {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
}
.pills li::before { content: "✓"; color: var(--ok); margin-right: 0.4rem; }

.frame {
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-lg);
}
.frame-bar {
  height: 1.9rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0 0.85rem;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
}
.frame-bar span { width: 0.6rem; height: 0.6rem; border-radius: 50%; background: var(--border); }
.frame img { display: block; width: 100%; height: auto; }

.feature-rows { display: grid; grid-template-columns: minmax(0, 1fr); gap: 4.5rem; }
.feature-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  gap: 3rem;
  align-items: center;
}
.feature-row.reverse > :first-child { order: 2; }
.feature-row h3 { font-size: 1.45rem; line-height: 1.25; margin: 0 0 0.75rem; }
.feature-row p { color: var(--text-muted); margin: 0 0 0.75rem; }
.feature-row ul { color: var(--text-muted); margin: 0; padding-left: 1.2rem; }
.feature-row li + li { margin-top: 0.35rem; }
.kicker {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

pre.code {
  margin: 1rem 0;
  padding: 1rem 1.25rem;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--text);
}
pre.code code { background: none; border: 0; padding: 0; font-size: inherit; }
.frame pre.code { margin: 0; border: 0; border-radius: 0; font-size: 0.8rem; padding: 1.25rem 1.5rem; }
.stack .frame { max-width: 48rem; }
pre.code.wrap, .frame pre.code { white-space: pre-wrap; overflow-wrap: anywhere; }
.stack .section-lead { max-width: 46rem; }
.tok-k { color: var(--accent); }
.tok-s { color: var(--ok); }
.tok-c { color: var(--text-muted); }

.badges { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 1rem; }
.badges li {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1.1rem 1.25rem;
}
.badges strong { display: block; font-size: 1.1rem; margin-bottom: 0.25rem; }
.badges span { display: block; color: var(--text-muted); font-size: 0.92rem; }
.badges code { font-size: 0.82rem; }

.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid; grid-template-columns: minmax(0, 1fr); gap: 1rem; }
.steps > li {
  counter-increment: step;
  position: relative;
  padding: 0 0 0 3rem;
  min-height: 2.2rem;
}
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.95rem;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--border);
}
.steps strong { display: block; }
.steps p { margin: 0.15rem 0 0; color: var(--text-muted); }

.band { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.price-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  background:
    radial-gradient(40rem 16rem at 100% 0%, var(--glow-a), transparent 60%),
    var(--surface);
  box-shadow: var(--shadow-lg);
}
.price-card h2 { margin: 0 0 0.35rem; }
.price-card p { margin: 0; color: var(--text-muted); max-width: 38rem; }

.products { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); gap: 1.25rem; }
.product {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  height: 100%;
}
.product .tag { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); }
.product h3 { margin: 0; font-size: 1.25rem; display: flex; align-items: center; gap: 0.6rem; }
.product h3 img { width: 1.9rem; height: 1.9rem; }
.product p { margin: 0; color: var(--text-muted); flex: 1; }
.product .more { font-weight: 600; text-decoration: none; }
.product .more::after { content: " →"; }

/* Docs with a sticky side table of contents on wide screens */
.doc-wide { max-width: var(--maxw); margin: 0 auto; padding: 3rem 1rem 4rem; display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: 3rem; }
.doc-wide .toc { position: sticky; top: 1.5rem; align-self: start; margin: 0; max-height: calc(100vh - 3rem); overflow: auto; }
.doc-wide .toc ol { font-size: 0.93rem; }
.doc-wide .toc li + li { margin-top: 0.25rem; }
.doc-wide .doc { max-width: var(--readw); margin: 0; padding: 0; }
.doc figure { margin: 1.5rem 0; }
.doc figcaption { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.6rem; }
.doc .frame { box-shadow: 0 16px 40px -20px rgba(9, 30, 66, 0.35); }
.kind { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.85rem; white-space: nowrap; }

@media (max-width: 56rem) {
  .feature-row, .feature-row.reverse { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .feature-row.reverse > :first-child { order: 0; }
  .doc-wide { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .doc-wide .toc { position: static; max-height: none; margin-bottom: 1rem; }
}
@media (max-width: 40rem) {
  .hero-product .hero-head { flex-direction: column; gap: 0.75rem; }
  .hero-product .app-icon { width: 2.75rem; height: 2.75rem; }
  .hero-product .shot { margin-top: 2rem; }
  .feature-rows { gap: 3rem; }
  .price-card { padding: 1.5rem; }
}

/* Company home: logo and featured product (ArtUp AR XR) */
.hero-brand { margin: 0 0 1.25rem; }
.hero-brand img { display: block; height: 3rem; width: auto; }
.sub-title { font-size: 1.3rem; margin: 2.75rem 0 0.35rem; }
.product-feature {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 1.25rem 1.5rem;
  padding: 1.5rem 1.75rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  color: var(--text);
  text-decoration: none;
  background:
    radial-gradient(36rem 14rem at 100% 0%, var(--glow-b), transparent 60%),
    radial-gradient(30rem 14rem at 0% 100%, var(--glow-a), transparent 60%),
    var(--surface);
  box-shadow: var(--shadow-lg);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.product-feature:hover { color: var(--text); border-color: var(--accent); transform: translateY(-2px); }
.product-feature img { width: 4rem; height: 4rem; display: block; filter: drop-shadow(0 8px 16px rgba(92, 77, 255, 0.35)); }
.product-feature-body { display: flex; flex-direction: column; gap: 0.3rem; }
.product-feature-body strong { font-size: 1.35rem; line-height: 1.25; }
.product-feature-body > span:last-child { color: var(--text-muted); }
.product-feature .tag { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); }
.product-feature .more { font-weight: 600; color: var(--accent); white-space: nowrap; }
.product-feature .more::after { content: " →"; }
@media (max-width: 40rem) {
  .product-feature { grid-template-columns: minmax(0, 1fr); padding: 1.25rem; }
  .product-feature img { width: 3.25rem; height: 3.25rem; }
}

/* RU | EN switch (/ar-xr/assets/lang.js) — same look as the AR XR header switch */
.lang-toggle {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  margin-left: auto;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.lang-toggle button {
  min-width: 2.35rem;
  padding: 0.28rem 0.55rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  font: 600 0.8rem/1.2 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  letter-spacing: 0.03em;
  cursor: pointer;
}
.lang-toggle button:hover { color: var(--text); }
.lang-toggle button[aria-pressed="true"] {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(9, 30, 66, 0.12), 0 1px 3px rgba(9, 30, 66, 0.08);
}
.lang-toggle button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Header on phones, small tablets and touch screens: brand and RU|EN on the first row, the nav wraps
   below at full width; links and buttons get 40-44px tap targets. */
@media (max-width: 56rem), (pointer: coarse) {
  .brand { min-height: 2.75rem; }
  .site-nav a { display: inline-flex; align-items: center; justify-content: center; min-width: 2.5rem; min-height: 2.5rem; }
  .lang-toggle button { min-width: 2.5rem; min-height: 2.5rem; }
}
@media (max-width: 56rem) {
  .site-header .container { gap: 0.25rem 1rem; padding-top: 0.5rem; padding-bottom: 0.5rem; }
  .site-header .brand { order: 1; }
  .site-header .lang-toggle { order: 2; }
  .site-nav { order: 3; flex: 1 1 100%; }
  .site-nav ul { gap: 0 1rem; }
}

/* Russian-only notes (the legal pages' translation disclaimer); hidden in English and without JS */
html:not([lang="ru"]) [data-lang="ru"] { display: none !important; }
.i18n-note {
  margin: 0 0 1.25rem;
  padding: 0.75rem 1rem;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  font-size: 0.95rem;
}