/* IBM Plex, self-hosted (SIL Open Font License, see fonts/OFL.txt). Latin + Latin Extended (Polish). */
/* IBM Plex Mono 400 latin-ext */
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 400; font-display: swap;
  src: url(fonts/ibm-plex-mono-400-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-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF; }
/* IBM Plex Mono 400 latin */
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 400; font-display: swap;
  src: url(fonts/ibm-plex-mono-400-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; }
/* IBM Plex Mono 500 latin-ext */
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 500; font-display: swap;
  src: url(fonts/ibm-plex-mono-500-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-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF; }
/* IBM Plex Mono 500 latin */
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 500; font-display: swap;
  src: url(fonts/ibm-plex-mono-500-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; }
/* IBM Plex Sans 400 600 latin-ext */
@font-face { font-family: 'IBM Plex Sans'; font-style: normal; font-weight: 400 600; font-display: swap;
  src: url(fonts/ibm-plex-sans-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-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF; }
/* IBM Plex Sans 400 600 latin */
@font-face { font-family: 'IBM Plex Sans'; font-style: normal; font-weight: 400 600; font-display: swap;
  src: url(fonts/ibm-plex-sans-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: #ffffff;
  --bg-alt: #f4f6f8;
  --surface: #ffffff;
  --ink: #0f1720;
  --ink-2: #33404d;
  --muted: #64707d;
  --line: #dde2e7;
  --line-strong: #c3cbd3;
  --accent: #0b5394;        /* engineering blue */
  --accent-hover: #083f71;
  --accent-ink: #ffffff;
  --accent-soft: #e7eff7;
  --field: #ffffff;
  --topbar: rgba(255, 255, 255, .9);
  --danger: #b3261e;

  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --wrap: 1200px;
  --pad: clamp(20px, 4vw, 40px);
  --radius: 3px;
}
[data-theme="dark"] {
  --bg: #0c1117;
  --bg-alt: #111820;
  --surface: #141c25;
  --ink: #e6ebf0;
  --ink-2: #b9c3cd;
  --muted: #8693a0;
  --line: #222d38;
  --line-strong: #34424f;
  --accent: #4c95d9;
  --accent-hover: #6aaae6;
  --accent-ink: #07111b;
  --accent-soft: #13263a;
  --field: #0c1117;
  --topbar: rgba(12, 17, 23, .88);
  --danger: #ef6b62;
  color-scheme: dark;
}
[data-theme="light"] { color-scheme: light; }

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 16px/1.65 var(--sans); -webkit-font-smoothing: antialiased;
  transition: background-color .2s, color .2s;
}
h1, h2, h3 { margin: 0; font-weight: 600; line-height: 1.15; letter-spacing: -.015em; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--pad); }
.skip { position: absolute; left: -9999px; top: 8px; background: var(--ink); color: var(--bg); padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 46px; padding: 0 22px; border-radius: var(--radius);
  font: 500 15px/1 var(--sans); text-decoration: none; cursor: pointer;
  border: 1px solid transparent; transition: background .15s, color .15s, border-color .15s;
  white-space: nowrap;
}
.btn--primary { background: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { background: var(--accent-hover); }
.btn--line { border-color: var(--line-strong); color: var(--ink); background: transparent; }
.btn--line:hover { border-color: var(--ink); }
.btn--sm { min-height: 38px; padding: 0 16px; font-size: 14px; }

/* ---------- top bar ---------- */
.topbar { position: sticky; top: 0; z-index: 50; background: var(--topbar); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.topbar__inner { display: flex; align-items: center; gap: 32px; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand__logo { width: 30px; height: 30px; fill: none; stroke: var(--accent); stroke-width: 2; }
.brand__logo rect { fill: var(--accent); stroke: none; }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name { font-weight: 600; font-size: 19px; letter-spacing: .06em; }
.brand__sub { font-size: 11px; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; }
.nav { display: flex; gap: 4px; margin-left: 8px; }
.nav a { text-decoration: none; font-size: 15px; color: var(--ink-2); padding: 8px 12px; border-radius: var(--radius); }
.nav a:hover { color: var(--ink); background: var(--bg-alt); }
.topbar__tools { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.iconbtn {
  display: inline-grid; place-items: center; width: 38px; height: 38px; padding: 0;
  background: transparent; color: var(--ink-2); cursor: pointer;
  border: 1px solid var(--line); border-radius: var(--radius);
}
.iconbtn:hover { color: var(--ink); border-color: var(--line-strong); }
.iconbtn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.i-sun { display: none; }
[data-theme="dark"] .i-sun { display: block; }
[data-theme="dark"] .i-moon { display: none; }
.lang { display: flex; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.lang button { font: 500 12px/1 var(--sans); letter-spacing: .05em; background: transparent; color: var(--muted); border: 0; padding: 0 10px; height: 36px; cursor: pointer; }
.lang button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }

/* ---------- hero ---------- */
.hero { padding: clamp(64px, 9vw, 120px) 0 clamp(56px, 7vw, 96px); border-bottom: 1px solid var(--line);
  background:
    linear-gradient(var(--bg) 0 0) padding-box,
    var(--bg);
  position: relative; overflow: hidden; }
.hero::before { /* fine engineering grid */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(100deg, transparent 35%, #000 75%);
  opacity: .55;
}
.hero__grid { position: relative; display: grid; grid-template-columns: 1.25fr 1fr; gap: clamp(40px, 6vw, 96px); align-items: center; }
.kicker { font-size: 13px; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin-bottom: 22px; }
.hero h1 { font-size: clamp(34px, 4.4vw, 54px); letter-spacing: -.025em; }
.lede { margin-top: 24px; font-size: clamp(17px, 1.45vw, 19px); color: var(--ink-2); max-width: 34em; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }

.lifecycle { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 1px 2px rgba(15, 23, 32, .04), 0 12px 32px -12px rgba(15, 23, 32, .12); }
.lifecycle__title { padding: 16px 22px; font-size: 12px; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); border-bottom: 1px solid var(--line); }
.lifecycle li + li { border-top: 1px solid var(--line); }
.lifecycle a { display: grid; grid-template-columns: 36px 1fr; column-gap: 12px; padding: 15px 22px; text-decoration: none; transition: background .15s; }
.lifecycle a:hover { background: var(--bg-alt); }
.lc__no { grid-row: span 2; font: 500 13px/1.6 var(--mono); color: var(--accent); }
.lc__name { font-weight: 600; font-size: 16px; }
.lc__desc { font-size: 14px; color: var(--muted); }

/* ---------- commitments ---------- */
.strip { border-bottom: 1px solid var(--line); background: var(--bg-alt); }
.strip__grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.strip__grid > div { padding: 28px 24px 28px 0; font-size: 14px; color: var(--muted); }
.strip__grid > div + div { padding-left: 24px; border-left: 1px solid var(--line); }
.strip__h { font-size: 15px; font-weight: 600; color: var(--ink); margin-bottom: 4px; }

/* ---------- trusted by ---------- */
.trusted { border-bottom: 1px solid var(--line); }
.trusted__inner { display: flex; align-items: center; flex-wrap: wrap; gap: 16px 48px; padding-top: 28px; padding-bottom: 28px; }
.trusted__h { font-size: 13px; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.trusted__list { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 56px; }
.trusted__list li { font-size: clamp(22px, 2.4vw, 28px); font-weight: 600; letter-spacing: -.01em; color: var(--ink-2); }

/* ---------- sections ---------- */
.section { padding: clamp(72px, 9vw, 120px) 0; }
.section--alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section__head { max-width: 760px; margin-bottom: clamp(40px, 5vw, 64px); }
.eyebrow { font-size: 13px; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
.section h2 { font-size: clamp(28px, 3.2vw, 40px); }
.section__intro { margin-top: 16px; font-size: 17px; color: var(--ink-2); max-width: 40em; }

/* services */
.services { border-top: 1px solid var(--ink); }
.service { display: grid; grid-template-columns: 80px minmax(0, 1.25fr) minmax(0, 1fr); gap: 32px; padding: 36px 0; border-bottom: 1px solid var(--line); }
.service__no { font: 500 14px/1.9 var(--mono); color: var(--muted); }
.service h3 { font-size: 22px; }
.service p:not(.service__no) { margin-top: 10px; color: var(--ink-2); }
.deliv { padding-top: 4px; }
.deliv li { position: relative; padding: 7px 0 7px 22px; font-size: 15px; color: var(--ink-2); border-bottom: 1px dashed var(--line); }
.deliv li:last-child { border-bottom: 0; }
.deliv li::before { content: ""; position: absolute; left: 2px; top: 16px; width: 8px; height: 8px; border: 1.5px solid var(--accent); border-radius: 1px; }

.options { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 20px; }
.options > div { border: 1px solid var(--line); border-top: 2px solid var(--accent); border-radius: var(--radius); padding: 14px 16px; background: var(--surface); }
.options p { margin: 0 !important; font-size: 14px; color: var(--muted) !important; }
.options .options__h { font-size: 15px; font-weight: 600; color: var(--ink) !important; margin-bottom: 4px !important; }
@media (max-width: 640px) { .options { grid-template-columns: 1fr; } }

/* projects */
.cases { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.case { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(24px, 3vw, 32px); display: flex; flex-direction: column; gap: 10px; }
.case h3 { font-size: 20px; }
.case p { color: var(--ink-2); }
.case__sector { font-size: 12px; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--accent) !important; }
.case__tech { margin-top: auto; padding-top: 16px; border-top: 1px solid var(--line); font: 400 13px/1.5 var(--mono); color: var(--muted) !important; }
.cases > .case:not(.case--feature):last-child:nth-child(even) { grid-column: 1 / -1; }
.case--feature { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1.6fr; gap: clamp(24px, 4vw, 56px); padding: clamp(28px, 4vw, 44px); }
.case--feature h3 { font-size: clamp(24px, 2.4vw, 30px); margin-top: 10px; }
.case--feature .case__body > p { font-size: 17px; }
.case__facts { margin: 24px 0 0; display: grid; gap: 0; border-top: 1px solid var(--line); }
.case__facts > div { display: grid; grid-template-columns: 120px 1fr; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.case__facts dt { color: var(--muted); }
.case__facts dd { margin: 0; font-family: var(--mono); font-size: 13px; padding-top: 1px; }

/* why — customer problems */
.pains { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pain { background: var(--surface); border: 1px solid var(--line); border-top: 2px solid var(--accent); border-radius: var(--radius); padding: clamp(22px, 2.6vw, 28px); }
.pain h3 { font-size: 18px; line-height: 1.3; }
.pain p { margin-top: 10px; color: var(--ink-2); font-size: 15px; }

/* service pitch line */
.service p.service__pitch { margin-top: 6px; font-size: 17px; font-weight: 500; color: var(--accent); }

.faq__list summary::-webkit-details-marker { display: none; }
.faq__list summary::after { content: "+"; font: 500 18px/1 var(--mono); color: var(--accent); flex: none; }
.faq__list details[open] summary::after { content: "−"; }

/* faq */
.faq { display: grid; grid-template-columns: 1fr 1.7fr; gap: clamp(32px, 6vw, 96px); align-items: start; }
.section__head--side { margin-bottom: 0; }
.faq__list { border-top: 1px solid var(--ink); }
.faq__list details { border-bottom: 1px solid var(--line); }
.faq__list summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 16px; padding: 18px 0; font-size: 17px; font-weight: 500; }
.faq__list summary:hover { color: var(--accent); }
.faq__list p { padding: 0 32px 20px 0; color: var(--ink-2); }

/* process */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.steps li { counter-increment: step; padding-top: 22px; border-top: 2px solid var(--accent); }
.steps li::before { content: "0" counter(step); display: block; font: 500 13px/1 var(--mono); color: var(--muted); margin-bottom: 14px; }
.steps h3 { font-size: 18px; }
.steps p { margin-top: 8px; color: var(--ink-2); font-size: 15px; }

/* contact */
.contact { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(40px, 6vw, 96px); align-items: start; }
.details { margin: 36px 0 0; border-top: 1px solid var(--line); }
.details > div { display: grid; grid-template-columns: 120px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.details dt { color: var(--muted); font-size: 14px; padding-top: 2px; }
.details dd { margin: 0; font-weight: 500; }
.details a { text-decoration: none; }
.details a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

.form { display: grid; gap: 20px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(24px, 3vw, 36px); box-shadow: 0 12px 32px -16px rgba(15, 23, 32, .14); }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: grid; gap: 7px; border: 0; padding: 0; margin: 0; min-width: 0; }
.field label, .field legend { font-size: 14px; font-weight: 500; padding: 0; }
.field legend { margin-bottom: 8px; }
input, textarea {
  font: inherit; font-size: 15px; color: var(--ink); background: var(--field);
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  padding: 11px 13px; min-height: 46px; width: 100%;
}
textarea { resize: vertical; }
input:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
.field.invalid input, .field.invalid textarea { border-color: var(--danger); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips label { position: relative; cursor: pointer; }
.chips input { position: absolute; opacity: 0; width: 1px; height: 1px; min-height: 0; }
.chips span { display: inline-flex; align-items: center; min-height: 40px; padding: 0 14px; border: 1px solid var(--line-strong); border-radius: var(--radius); font-size: 14px; background: var(--field); }
.chips span:hover { border-color: var(--ink-2); }
.chips input:checked + span { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); font-weight: 500; }
.chips input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.form__foot { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.form__note { font-size: 14px; color: var(--muted); }

/* footer */
.footer { background: var(--bg-alt); border-top: 1px solid var(--line); padding-top: 56px; font-size: 14px; color: var(--muted); }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer__name { font-size: 18px; font-weight: 600; letter-spacing: .06em; color: var(--ink); margin-bottom: 8px; }
.footer__brand p:not(.footer__name) { max-width: 26em; }
.footer__h { font-size: 12px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--ink); margin-bottom: 12px; }
.footer li { padding: 3px 0; }
.footer a { text-decoration: none; }
.footer a:hover { color: var(--ink); }
.footer__base { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 16px; padding-top: 20px; padding-bottom: 28px; border-top: 1px solid var(--line); }

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .nav { display: none; }
}
@media (max-width: 900px) {
  .hero__grid, .contact, .faq, .case--feature { grid-template-columns: 1fr; }
  .service { grid-template-columns: 56px 1fr; }
  .service .deliv { grid-column: 2; }
  .strip__grid, .steps, .pains { grid-template-columns: 1fr 1fr; }
  .strip__grid > div:nth-child(3) { padding-left: 0; border-left: 0; }
  .strip__grid > div:nth-child(n+3) { border-top: 1px solid var(--line); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .topbar__tools .btn { display: none; }
  .brand__sub { display: none; }
  .cases, .pains, .strip__grid, .steps, .form__row, .footer__grid { grid-template-columns: 1fr; }
  .strip__grid > div, .strip__grid > div + div { padding: 18px 0; border-left: 0; }
  .strip__grid > div + div { border-top: 1px solid var(--line); }
  .service { grid-template-columns: 1fr; gap: 12px; }
  .service .deliv { grid-column: auto; }
  .details > div, .case__facts > div { grid-template-columns: 1fr; gap: 2px; }
  .hero::before { display: none; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } body { transition: none; } }