/* 3xui.ibcsc.be — near-black page with the pale lime of the package icon; mono labels read like an Xray route. */
@font-face { font-family: "Onest"; font-style: normal; font-weight: 100 900; font-display: swap; src: url(../fonts/onest-normal-cyrillic.woff2) format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "Onest"; font-style: normal; font-weight: 100 900; font-display: swap; src: url(../fonts/onest-normal-latin-ext.woff2) format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "Onest"; font-style: normal; font-weight: 100 900; font-display: swap; src: url(../fonts/onest-normal-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 100 800; font-display: swap; src: url(../fonts/jbmono-cyrillic.woff2) format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 100 800; font-display: swap; src: url(../fonts/jbmono-latin-ext.woff2) format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 100 800; font-display: swap; src: url(../fonts/jbmono-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }

:root {
  --bg: #0a0a08;
  --bg-2: #12120f;
  --bg-3: #1a1a15;
  --line: #2a2a22;
  --line-2: #3a3a2e;
  --text: #ecebe2;
  --text-2: #a8a796;
  --text-3: #75745f;
  --lime: #eef8a8;
  --lime-2: #d9e68a;
  --olive: #b6c072;
  --on-lime: #12140a;
  --sans: "Onest", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --wrap: 1160px;
  --gut: 24px;
  --r: 10px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
h1, h2, h3 { text-wrap: balance; margin: 0; font-weight: 600; letter-spacing: -0.02em; line-height: 1.1; }
p { margin: 0; }
:focus-visible { outline: 2px solid var(--lime); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--lime); color: var(--on-lime); }

.wrap { width: 100%; max-width: calc(var(--wrap) + var(--gut) * 2); margin: 0 auto; padding: 0 var(--gut); }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; z-index: 100; background: var(--lime); color: var(--on-lime); padding: 8px 12px; border-radius: 6px; }

.kicker, .tag, .meta, .route, .card-n, .step-n, .source-k, .dl-arch, .ticker, .stats dt {
  font-family: var(--mono);
}

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 22px;
  background: var(--lime); color: var(--on-lime);
  border: 1px solid var(--lime); border-radius: 999px;
  font: 600 16px/1 var(--sans); text-decoration: none; white-space: nowrap;
  transition: background .15s, border-color .15s, color .15s;
}
.btn:hover { background: #fff; border-color: #fff; }
.btn-ghost { background: rgba(10, 10, 8, .72); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); color: var(--text); border-color: var(--line-2); }
.btn-ghost:hover { background: var(--bg-3); border-color: var(--text-3); color: var(--text); }
.btn-sm { min-height: 36px; padding: 0 16px; font-size: 14px; }

/* ---------------------------------------------------------------- header */
.top {
  position: sticky; top: 0; z-index: 20;
  background: rgba(10, 10, 8, .82);
  -webkit-backdrop-filter: saturate(140%) blur(14px); backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.top-in { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 600; font-size: 17px; }
.brand img { border-radius: 8px; }
.brand em { font-style: normal; color: var(--text-3); font-weight: 500; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a { padding: 8px 12px; border-radius: 8px; color: var(--text-2); text-decoration: none; font-size: 15px; }
.nav a:hover { color: var(--text); background: var(--bg-3); }
.lang { position: relative; }
.lang summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center; min-width: 44px; height: 36px; padding: 0 10px;
  border: 1px solid var(--line-2); border-radius: 8px;
  font: 500 13px/1 var(--mono); color: var(--text-2);
}
.lang summary::-webkit-details-marker { display: none; }
.lang summary:hover, .lang[open] summary { color: var(--text); border-color: var(--text-3); }
.lang ul {
  position: absolute; right: 0; top: calc(100% + 8px); z-index: 30;
  margin: 0; padding: 6px; list-style: none; min-width: 168px;
  background: var(--bg-2); border: 1px solid var(--line-2); border-radius: var(--r);
  box-shadow: 0 16px 40px rgba(0, 0, 0, .5);
}
.lang li a { display: block; padding: 8px 12px; border-radius: 6px; text-decoration: none; color: var(--text-2); font-size: 15px; }
.lang li a:hover { background: var(--bg-3); color: var(--text); }
.lang li a[aria-current] { color: var(--lime); }

/* ---------------------------------------------------------------- hero */
.hero { position: relative; padding: 88px 0 0; }
.hero::before {
  content: ""; position: absolute; inset: 0 0 auto; height: min(62vw, 860px); z-index: -1; pointer-events: none;
  background: url(../img/engr-hero.webp) center top / cover no-repeat;
  opacity: .55;
  -webkit-mask-image: linear-gradient(#000 55%, transparent), linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(#000 55%, transparent), linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-composite: intersect;
}
.hero::after {
  content: ""; position: absolute; inset: 0 0 auto; height: 760px; z-index: -1; pointer-events: none;
  background: radial-gradient(50% 58% at 50% 42%, rgba(10, 10, 8, .96) 30%, rgba(10, 10, 8, .7) 62%, transparent 100%);
}
.hero-in { max-width: 920px; text-align: center; }
.kicker { font-size: 13px; letter-spacing: .04em; color: var(--olive); margin-bottom: 24px; }
.hero h1 { font-size: clamp(42px, 7.2vw, 84px); font-weight: 650; letter-spacing: -0.035em; line-height: 1.02; }
.hero h1 span { display: block; }
.hero h1 .hl { color: var(--lime); }
.lead { margin: 28px auto 0; max-width: 680px; font-size: 19px; color: var(--text-2); }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 36px; }
.meta { margin-top: 20px; font-size: 12.5px; color: var(--text-2); }

.route {
  display: grid; grid-template-columns: repeat(4, 1fr);
  margin: 72px 0 0; padding: 0; list-style: none;
  border: 1px solid var(--line); border-bottom: 0; border-radius: var(--r) var(--r) 0 0;
  background: var(--bg-2);
}
.route li { position: relative; padding: 14px 20px; display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.route li + li { border-left: 1px solid var(--line); }
.route li + li::before {
  content: ""; position: absolute; left: -5px; top: 50%; width: 9px; height: 9px; margin-top: -4px;
  background: var(--bg-2); border: 1px solid var(--line-2); border-left: 0; border-bottom: 0; transform: rotate(45deg);
}
.route li:last-child .route-v { color: var(--lime); }
.route-k { font-size: 11px; text-transform: uppercase; letter-spacing: .1em; color: var(--text-3); }
.route-v { font-size: 13.5px; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.window { margin: 0; border: 1px solid var(--line-2); border-radius: var(--r); overflow: hidden; background: #1c1c1c; box-shadow: 0 40px 80px -30px rgba(0, 0, 0, .8); }
.route + .window { border-top-left-radius: 0; border-top-right-radius: 0; box-shadow: 0 60px 120px -40px rgba(238, 248, 168, .12), 0 40px 80px -30px rgba(0, 0, 0, .8); }
.window-bar { display: flex; align-items: center; gap: 7px; height: 34px; padding: 0 14px; background: #20201c; border-bottom: 1px solid #2c2c26; }
.window-bar i { width: 10px; height: 10px; border-radius: 50%; background: #3b3b33; }
.window-bar span { margin-left: 10px; font: 500 12px/1 var(--mono); color: var(--text-3); }

/* ---------------------------------------------------------------- ticker */
.ticker { margin-top: 96px; border-block: 1px solid var(--line); overflow: hidden; background: var(--bg-2); }
.ticker-track { display: flex; width: max-content; animation: ticker 48s linear infinite; }
.ticker span { padding: 18px 28px; font-size: 14px; color: var(--text-2); white-space: nowrap; }
.ticker span::after { content: "/"; margin-left: 56px; color: var(--line-2); }
@keyframes ticker { to { transform: translateX(-50%); } }

/* ---------------------------------------------------------------- stats */
.stats dl { display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; }
.stats dl > div { padding: 48px 0 52px; border-left: 1px solid var(--line); padding-left: 28px; }
.stats dl > div:first-child { border-left: 0; padding-left: 0; }
.stats dt { font-size: clamp(44px, 6vw, 72px); font-weight: 500; letter-spacing: -0.04em; line-height: 1; color: var(--lime); }
.stats dd { margin: 10px 0 0; color: var(--text-2); font-size: 15px; }

/* ---------------------------------------------------------------- features */
.features { border-top: 1px solid var(--line); }
.feature { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 64px; align-items: center; padding-block: 104px; }
.feature + .feature { border-top: 1px solid var(--line); }
.feature.flip .feature-text { order: 2; }
.tag { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--olive); text-transform: uppercase; letter-spacing: .08em; }
.tag span { color: var(--on-lime); background: var(--lime); padding: 3px 7px; border-radius: 4px; letter-spacing: 0; }
.feature h2 { margin-top: 20px; font-size: clamp(30px, 3.4vw, 42px); }
.feature-text > p { margin-top: 18px; color: var(--text-2); }
.ticks { margin: 28px 0 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.ticks li { position: relative; padding-left: 26px; font-size: 15.5px; line-height: 1.5; }
.ticks li::before { content: ""; position: absolute; left: 2px; top: .55em; width: 12px; height: 2px; background: var(--lime); }

/* ---------------------------------------------------------------- DSM cards */
.dsm { padding-block: 104px; border-top: 1px solid var(--line); }
.dsm h2 { font-size: clamp(30px, 3.6vw, 46px); max-width: 640px; }
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 48px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.card { background: var(--bg); padding: 28px 24px 32px; }
.card-n { font-size: 12px; color: var(--text-3); }
.card h3 { margin-top: 28px; font-size: 19px; letter-spacing: -0.01em; }
.card p { margin-top: 10px; font-size: 15px; line-height: 1.55; color: var(--text-2); }

/* ---------------------------------------------------------------- install */
.install { position: relative; isolation: isolate; padding-block: 104px; background: var(--bg-2); border-block: 1px solid var(--line); overflow: hidden; }
.install::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: url(../img/engr-install.webp) right center / auto 120% no-repeat;
  opacity: .16;
  -webkit-mask-image: linear-gradient(90deg, transparent 25%, #000 75%);
  mask-image: linear-gradient(90deg, transparent 25%, #000 75%);
}
.install h2 { font-size: clamp(30px, 3.6vw, 46px); }
.steps { margin: 48px 0 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.steps li { position: relative; padding: 28px 24px 30px; border: 1px solid var(--line-2); border-radius: var(--r); background: var(--bg); }
.steps li:first-child { grid-column: 1 / -1; display: grid; grid-template-columns: auto minmax(0, 1fr) minmax(0, 1.2fr); column-gap: 24px; align-items: start; border-color: var(--olive); }
.steps li:first-child .step-n { grid-row: span 2; }
.steps li:first-child .source { grid-column: 3; grid-row: 1 / span 2; align-self: center; margin-top: 0; }
.step-n { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--line-2); font-size: 14px; color: var(--lime); }
.steps li:first-child .step-n { background: var(--lime); color: var(--on-lime); border-color: var(--lime); }
.steps h3 { margin-top: 18px; font-size: 19px; }
.steps li:first-child h3 { margin-top: 4px; }
.steps p { margin-top: 10px; font-size: 15px; color: var(--text-2); }
.source { display: flex; align-items: center; gap: 12px; margin-top: 18px; padding: 10px 10px 10px 16px; border: 1px solid var(--line-2); border-radius: 999px; background: var(--bg-2); min-width: 0; }
.source-k { display: none; }
.source code { flex: 1; min-width: 0; font: 500 15px/1.4 var(--mono); color: var(--lime); overflow-wrap: anywhere; }
.copy {
  flex: none; min-height: 38px; padding: 0 16px; border-radius: 999px; cursor: pointer;
  background: var(--bg-3); color: var(--text); border: 1px solid var(--line-2); font: 500 14px/1 var(--sans);
}
.copy:hover { border-color: var(--text-3); }
.copy.done { background: var(--lime); color: var(--on-lime); border-color: var(--lime); }

.downloads { margin-top: 56px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 16px 48px; align-items: start; }
.downloads > p:first-child { color: var(--text-2); font-size: 15.5px; }
.downloads ul { grid-column: 2; grid-row: 1 / span 2; margin: 0; padding: 0; list-style: none; border: 1px solid var(--line-2); border-radius: var(--r); overflow: hidden; }
.downloads li + li { border-top: 1px solid var(--line); }
.downloads li a { display: grid; grid-template-columns: 88px 1fr auto; align-items: center; gap: 16px; padding: 16px 20px; text-decoration: none; background: var(--bg); transition: background .15s; }
.downloads li a:hover { background: var(--bg-3); }
.downloads li a::after { content: "↓"; grid-column: 4; color: var(--text-3); font-family: var(--mono); }
.downloads li a:hover::after { color: var(--lime); }
.dl-arch { font-size: 13.5px; color: var(--lime); }
.dl-name { font-size: 15.5px; }
.dl-size { font: 400 13px/1 var(--mono); color: var(--text-3); }
.small { font-size: 14px; color: var(--text-3); }
.small a { color: var(--text-2); text-underline-offset: 3px; text-decoration-color: var(--line-2); }
.small a:hover { color: var(--text); text-decoration-color: var(--text-3); }

/* ---------------------------------------------------------------- faq */
.faq { padding-block: 104px; display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 0 64px; align-items: start; }
.faq h2 { font-size: clamp(30px, 3.6vw, 46px); grid-row: span 5; position: sticky; top: 96px; }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 24px; padding: 22px 0; font-size: 18px; font-weight: 550; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 22px/1 var(--mono); color: var(--text-3); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); color: var(--lime); }
.faq summary:hover::after { color: var(--lime); }
.faq details p { padding: 0 48px 26px 0; color: var(--text-2); }

/* ---------------------------------------------------------------- footer */
.foot { border-top: 1px solid var(--line); padding-block: 40px 56px; font-size: 14px; color: var(--text-3); }
.foot-in { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px 40px; }
.foot p { max-width: 560px; }
.foot ul { display: flex; flex-wrap: wrap; gap: 8px 24px; margin: 0; padding: 0; list-style: none; }
.foot a { color: var(--text-2); text-decoration: none; }
.foot a:hover { color: var(--lime); }

.err { padding-block: 160px; text-align: center; }
.err h1 { font-size: clamp(36px, 6vw, 60px); margin-bottom: 32px; }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 1000px) {
  .route-v { white-space: normal; line-height: 1.45; }
  .faq { grid-template-columns: 1fr; }
  .faq h2 { position: static; margin-bottom: 28px; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .feature { grid-template-columns: 1fr; gap: 40px; padding-block: 80px; }
  .feature.flip .feature-text { order: 0; }
  .steps { grid-template-columns: 1fr; }
  .steps li:first-child { display: block; }
  .steps li:first-child h3 { margin-top: 18px; }
  .steps li:first-child .source { margin-top: 18px; }
  .downloads { grid-template-columns: 1fr; }
  .downloads ul { grid-column: auto; grid-row: auto; }
}
@media (max-width: 760px) {
  .hero::before { background-image: url(../img/engr-hero-800.webp); height: 520px; background-size: auto 100%; opacity: .5; }
  :root { --gut: 16px; }
  body { font-size: 16px; }
  .nav { display: none; }
  .lang { margin-left: auto; }
  .top-in { gap: 10px; }
  .hero { padding-top: 56px; }
  .lead { font-size: 17px; }
  .cta .btn { flex: 1 1 100%; }
  .route { grid-template-columns: 1fr 1fr; margin-top: 48px; }
  .route li:nth-child(3) { border-left: 0; }
  .route li:nth-child(n+3) { border-top: 1px solid var(--line); }
  .route li:nth-child(3)::before { display: none; }
  .route li { padding: 12px 14px; }
  .route-v { white-space: normal; font-size: 12.5px; line-height: 1.45; }
  .kicker { font-size: 11.5px; letter-spacing: 0; margin-bottom: 18px; }
  .ticker { margin-top: 64px; }
  .stats dl { grid-template-columns: 1fr 1fr; }
  .stats dl > div { padding: 28px 0 28px 20px; }
  .stats dl > div:nth-child(odd) { border-left: 0; padding-left: 0; }
  .stats dl > div:nth-child(n+3) { border-top: 1px solid var(--line); }
  .feature, .dsm, .install, .faq { padding-block: 64px; }
  .cards { grid-template-columns: 1fr; margin-top: 32px; }
  .card h3 { margin-top: 16px; }
  .source { flex-wrap: wrap; border-radius: 12px; padding: 12px; }
  .source code { flex-basis: 100%; }
  .copy { width: 100%; }
  .downloads li a { grid-template-columns: 64px 1fr auto; padding: 14px 16px; gap: 12px; }
  .faq summary { font-size: 16.5px; }
  .faq details p { padding-right: 0; }
}
@media (max-width: 420px) {
  .brand em { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ticker-track { animation: none; }
}