/* IVENRID TOV — B2B software development & IT systems integration, Kyiv.
   Bespoke dark stylesheet, prefix ivn-. Written fresh for this project,
   not shared with any sibling site. System fonts only, no external assets. */

:root {
  --ivn-bg:        #0a0e17;
  --ivn-bg-2:      #0c1120;
  --ivn-panel:     #111828;
  --ivn-surface:   #131b2c;
  --ivn-surface-2: #182238;
  --ivn-line:      #253150;
  --ivn-line-2:    #324268;
  --ivn-text:      #eaf0fb;
  --ivn-text-soft: #9aa8c6;
  --ivn-text-dim:  #66748f;
  --ivn-mint:      #34e3c4;
  --ivn-mint-2:    #62f0d6;
  --ivn-iris:      #7f78ff;
  --ivn-iris-2:    #a49dff;
  --ivn-ink:       #052622;
  --ivn-max:       1180px;
  --ivn-r:         14px;
  --ivn-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --ivn-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--ivn-sans);
  color: var(--ivn-text);
  background: var(--ivn-bg);
  line-height: 1.62;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { line-height: 1.12; letter-spacing: -.02em; }
::selection { background: rgba(52,227,196,.28); color: #fff; }

:focus-visible {
  outline: 2px solid var(--ivn-mint);
  outline-offset: 3px;
  border-radius: 4px;
}

.ivn-skip {
  position: absolute; left: -999px; top: 0; z-index: 90;
  background: var(--ivn-mint); color: var(--ivn-ink);
  padding: .65rem 1.1rem; font-weight: 600; border-radius: 0 0 8px 0;
}
.ivn-skip:focus { left: 0; top: 0; }

.ivn-shell { width: 100%; max-width: var(--ivn-max); margin: 0 auto; padding: 0 1.6rem; }

/* ---------------- top bar ---------------- */
.ivn-topbar {
  position: sticky; top: 0; z-index: 60;
  background: rgba(10,14,23,.72);
  backdrop-filter: blur(14px) saturate(1.3);
  border-bottom: 1px solid var(--ivn-line);
}
.ivn-topbar-inner {
  max-width: var(--ivn-max); margin: 0 auto;
  padding: .8rem 1.6rem;
  display: flex; align-items: center; gap: 1.5rem;
}
.ivn-logo { display: inline-flex; align-items: center; gap: .65rem; text-decoration: none; }
.ivn-logo-mark { width: 34px; height: 34px; border-radius: 9px; }
.ivn-logo-text { display: flex; flex-direction: column; line-height: 1; }
.ivn-logo-text b {
  font-size: 1.02rem; font-weight: 700; letter-spacing: .16em; color: var(--ivn-text);
}
.ivn-logo-text span {
  font-family: var(--ivn-mono); font-size: .58rem; letter-spacing: .26em;
  text-transform: uppercase; color: var(--ivn-text-dim); margin-top: .3rem;
}
.ivn-nav-gap { flex: 1; }
.ivn-nav { display: flex; align-items: center; gap: 1.7rem; }
.ivn-nav a {
  text-decoration: none; font-size: .9rem; color: var(--ivn-text-soft);
  position: relative; padding: .3rem 0; transition: color .18s ease;
}
.ivn-nav a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 2px;
  background: linear-gradient(90deg, var(--ivn-mint), var(--ivn-iris));
  transition: right .22s ease;
}
.ivn-nav a:hover, .ivn-nav a[aria-current="page"] { color: var(--ivn-text); }
.ivn-nav a:hover::after, .ivn-nav a[aria-current="page"]::after { right: 0; }
.ivn-nav-cta {
  text-decoration: none; font-size: .86rem; font-weight: 600;
  color: var(--ivn-ink); background: var(--ivn-mint);
  padding: .5rem 1.05rem; border-radius: 8px; white-space: nowrap;
  transition: transform .15s ease, box-shadow .18s ease;
}
.ivn-nav-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 20px -8px rgba(52,227,196,.6); }
.ivn-burger {
  display: none; margin-left: auto; background: transparent;
  border: 1px solid var(--ivn-line-2); border-radius: 8px;
  color: var(--ivn-text); padding: .4rem .55rem; cursor: pointer;
}
.ivn-burger svg { width: 20px; height: 20px; }

/* ---------------- hero ---------------- */
.ivn-hero {
  position: relative; overflow: hidden;
  padding: 5.2rem 0 3.6rem;
  background:
    radial-gradient(680px 380px at 12% -6%, rgba(52,227,196,.14), transparent 62%),
    radial-gradient(620px 420px at 96% 8%, rgba(127,120,255,.16), transparent 60%),
    var(--ivn-bg);
  border-bottom: 1px solid var(--ivn-line);
}
.ivn-hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.022) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(70% 70% at 50% 30%, #000 40%, transparent 100%);
}
.ivn-hero-grid {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 3rem; align-items: center;
}
.ivn-kicker {
  display: inline-flex; align-items: center; gap: .6rem;
  font-family: var(--ivn-mono); font-size: .72rem; letter-spacing: .2em;
  text-transform: uppercase; color: var(--ivn-mint);
  border: 1px solid var(--ivn-line-2); border-radius: 999px;
  padding: .34rem .85rem; background: rgba(52,227,196,.06);
}
.ivn-kicker::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--ivn-mint); box-shadow: 0 0 10px 1px var(--ivn-mint);
}
.ivn-hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem); font-weight: 700;
  margin: 1.3rem 0 1.2rem; max-width: 16ch;
}
.ivn-hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--ivn-mint), var(--ivn-iris-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.ivn-hero-lead { font-size: 1.1rem; color: var(--ivn-text-soft); max-width: 50ch; margin: 0 0 1.9rem; }
.ivn-cta-row { display: flex; flex-wrap: wrap; gap: .8rem; }

.ivn-btn {
  display: inline-flex; align-items: center; gap: .5rem;
  text-decoration: none; font-size: .94rem; font-weight: 600;
  padding: .82rem 1.5rem; border-radius: 10px; cursor: pointer;
  border: 1px solid transparent; transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}
.ivn-btn-primary {
  color: var(--ivn-ink);
  background: linear-gradient(100deg, var(--ivn-mint), var(--ivn-mint-2));
}
.ivn-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px -12px rgba(52,227,196,.65); }
.ivn-btn-ghost { color: var(--ivn-text); background: transparent; border-color: var(--ivn-line-2); }
.ivn-btn-ghost:hover { border-color: var(--ivn-mint); color: var(--ivn-mint); }

/* console / capability panel */
.ivn-console {
  position: relative; z-index: 1;
  border: 1px solid var(--ivn-line-2); border-radius: var(--ivn-r);
  background: linear-gradient(180deg, var(--ivn-surface-2), var(--ivn-surface));
  box-shadow: 0 30px 70px -40px rgba(0,0,0,.9), inset 0 1px 0 rgba(255,255,255,.03);
  overflow: hidden;
}
.ivn-console-bar {
  display: flex; align-items: center; gap: .5rem;
  padding: .7rem .95rem; border-bottom: 1px solid var(--ivn-line);
  background: rgba(255,255,255,.02);
}
.ivn-console-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--ivn-line-2); }
.ivn-console-dot:nth-child(1) { background: #ff6b6b; }
.ivn-console-dot:nth-child(2) { background: #f7c948; }
.ivn-console-dot:nth-child(3) { background: var(--ivn-mint); }
.ivn-console-title {
  font-family: var(--ivn-mono); font-size: .68rem; letter-spacing: .12em;
  color: var(--ivn-text-dim); margin-left: .4rem; text-transform: uppercase;
}
.ivn-console-body { padding: 1.1rem 1.15rem 1.3rem; font-family: var(--ivn-mono); font-size: .82rem; }
.ivn-console-line { display: flex; gap: .6rem; padding: .28rem 0; color: var(--ivn-text-soft); }
.ivn-console-line .k { color: var(--ivn-iris-2); }
.ivn-console-line .v { color: var(--ivn-text); margin-left: auto; }
.ivn-console-line .ok { color: var(--ivn-mint); }
.ivn-console-sep { height: 1px; background: var(--ivn-line); margin: .7rem 0; }
.ivn-console-note { color: var(--ivn-text-dim); font-size: .74rem; }

/* ---------------- facts strip ---------------- */
.ivn-facts {
  border-bottom: 1px solid var(--ivn-line);
  background: var(--ivn-bg-2);
}
.ivn-facts-inner {
  display: flex; flex-wrap: wrap; gap: 1.4rem 2.6rem;
  padding: 1.1rem 0; align-items: center;
}
.ivn-fact {
  font-family: var(--ivn-mono); font-size: .78rem; color: var(--ivn-text-soft);
  display: inline-flex; align-items: center; gap: .55rem;
}
.ivn-fact b { color: var(--ivn-text); font-weight: 600; }
.ivn-fact::before { content: "◇"; color: var(--ivn-mint); font-size: .7rem; }

/* ---------------- generic band ---------------- */
.ivn-band { padding: 4.4rem 0; border-bottom: 1px solid var(--ivn-line); }
.ivn-band.alt { background: var(--ivn-bg-2); }
.ivn-tag {
  font-family: var(--ivn-mono); font-size: .74rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ivn-mint);
}
.ivn-band-head { max-width: 62ch; margin-bottom: 2.6rem; }
.ivn-band-head h2 { font-size: clamp(1.7rem, 3.8vw, 2.5rem); margin: .7rem 0 .7rem; }
.ivn-band-head p { color: var(--ivn-text-soft); margin: 0; font-size: 1.02rem; }

/* ---------------- services ---------------- */
.ivn-services { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.ivn-service {
  position: relative; overflow: hidden;
  border: 1px solid var(--ivn-line); border-radius: var(--ivn-r);
  background: var(--ivn-panel); padding: 1.5rem 1.4rem 1.5rem;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}
.ivn-service::before {
  content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 100%;
  background: linear-gradient(90deg, var(--ivn-mint), var(--ivn-iris));
  transform: scaleX(0); transform-origin: left; transition: transform .25s ease;
}
.ivn-service:hover { transform: translateY(-4px); border-color: var(--ivn-line-2); background: var(--ivn-surface); }
.ivn-service:hover::before { transform: scaleX(1); }
.ivn-service-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; }
.ivn-service-ic {
  width: 44px; height: 44px; border-radius: 11px; display: grid; place-items: center;
  background: rgba(52,227,196,.09); border: 1px solid var(--ivn-line-2); color: var(--ivn-mint);
}
.ivn-service-ic svg { width: 22px; height: 22px; }
.ivn-service-idx { font-family: var(--ivn-mono); font-size: .78rem; color: var(--ivn-text-dim); }
.ivn-service h3 { font-size: 1.16rem; margin: 0 0 .5rem; letter-spacing: -.01em; }
.ivn-service p { margin: 0 0 .9rem; color: var(--ivn-text-soft); font-size: .93rem; }
.ivn-service-stack { font-family: var(--ivn-mono); font-size: .72rem; color: var(--ivn-iris-2); letter-spacing: .01em; }

/* ---------------- flow / timeline ---------------- */
.ivn-flow { display: grid; gap: 0; position: relative; }
.ivn-flow-step {
  display: grid; grid-template-columns: 96px 1fr; gap: 1.4rem;
  padding: 1.4rem 0; border-top: 1px solid var(--ivn-line); align-items: start;
}
.ivn-flow-step:first-child { border-top: 0; }
.ivn-flow-num {
  font-family: var(--ivn-mono); font-size: 1.7rem; font-weight: 600;
  color: transparent; -webkit-text-stroke: 1px var(--ivn-line-2);
  line-height: 1;
}
.ivn-flow-step:hover .ivn-flow-num {
  -webkit-text-stroke: 1px var(--ivn-mint); color: rgba(52,227,196,.08);
}
.ivn-flow-body h3 { font-size: 1.2rem; margin: 0 0 .4rem; }
.ivn-flow-body p { margin: 0; color: var(--ivn-text-soft); max-width: 66ch; }

/* ---------------- stack groups ---------------- */
.ivn-stack-groups { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.ivn-stack-group {
  border: 1px solid var(--ivn-line); border-radius: var(--ivn-r);
  background: var(--ivn-panel); padding: 1.35rem 1.3rem;
}
.ivn-stack-group h4 {
  font-family: var(--ivn-mono); font-size: .74rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ivn-text-dim); margin: 0 0 1rem;
}
.ivn-chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.ivn-chip {
  font-size: .8rem; color: var(--ivn-text-soft);
  border: 1px solid var(--ivn-line-2); border-radius: 999px;
  padding: .35rem .8rem; background: rgba(255,255,255,.015);
}
.ivn-chip:hover { color: var(--ivn-mint); border-color: var(--ivn-mint); }

/* ---------------- about + registry ---------------- */
.ivn-about { display: grid; grid-template-columns: 1.35fr .95fr; gap: 3rem; align-items: start; }
.ivn-about h2 { font-size: clamp(1.7rem, 3.8vw, 2.4rem); margin: .7rem 0 1.1rem; }
.ivn-about p { color: var(--ivn-text-soft); }
.ivn-registry {
  border: 1px solid var(--ivn-line-2); border-radius: var(--ivn-r);
  background:
    radial-gradient(400px 200px at 100% 0%, rgba(127,120,255,.12), transparent 60%),
    var(--ivn-surface);
  padding: 1.7rem 1.7rem;
}
.ivn-registry h3 {
  font-family: var(--ivn-mono); font-size: .74rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ivn-mint); margin: 0 0 1.1rem;
}
.ivn-registry dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: .7rem 1.1rem; font-size: .9rem; }
.ivn-registry dt { color: var(--ivn-text-dim); font-family: var(--ivn-mono); font-size: .72rem; letter-spacing: .04em; text-transform: uppercase; padding-top: .1rem; }
.ivn-registry dd { margin: 0; color: var(--ivn-text); }
.ivn-registry a { color: var(--ivn-mint); text-decoration: none; }
.ivn-registry a:hover { text-decoration: underline; }

/* ---------------- principle cards ---------------- */
.ivn-principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.ivn-principle {
  border: 1px solid var(--ivn-line); border-radius: var(--ivn-r);
  background: var(--ivn-panel); padding: 1.4rem 1.35rem;
}
.ivn-principle h3 { font-size: 1.08rem; margin: .2rem 0 .5rem; }
.ivn-principle p { margin: 0; color: var(--ivn-text-soft); font-size: .92rem; }
.ivn-principle .ivn-p-mark { color: var(--ivn-iris-2); font-family: var(--ivn-mono); font-size: .8rem; }

/* ---------------- CTA band ---------------- */
.ivn-cta-band {
  position: relative; overflow: hidden;
  background:
    radial-gradient(600px 300px at 20% 120%, rgba(52,227,196,.18), transparent 60%),
    radial-gradient(500px 260px at 90% -20%, rgba(127,120,255,.2), transparent 60%),
    var(--ivn-bg-2);
  border-bottom: 1px solid var(--ivn-line);
}
.ivn-cta-band .ivn-shell { padding-top: 4.4rem; padding-bottom: 4.4rem; text-align: center; }
.ivn-cta-band h2 { font-size: clamp(1.9rem, 4.4vw, 2.9rem); margin: 0 0 .9rem; }
.ivn-cta-band p { color: var(--ivn-text-soft); max-width: 56ch; margin: 0 auto 1.9rem; font-size: 1.05rem; }

/* ---------------- footer ---------------- */
.ivn-footer { background: #070a12; color: var(--ivn-text-soft); padding: 3.4rem 0 2rem; }
.ivn-footer-grid { display: grid; grid-template-columns: 1.8fr 1fr 1.2fr; gap: 2.4rem; }
.ivn-footer h4 { color: var(--ivn-text); font-size: 1rem; margin: 0 0 .9rem; letter-spacing: .01em; }
.ivn-footer-brand { display: flex; align-items: center; gap: .6rem; margin-bottom: .8rem; }
.ivn-footer-brand img { width: 30px; height: 30px; border-radius: 8px; }
.ivn-footer-brand b { color: var(--ivn-text); font-weight: 700; letter-spacing: .12em; }
.ivn-footer p { margin: .28rem 0; font-size: .88rem; }
.ivn-footer ul { list-style: none; margin: 0; padding: 0; }
.ivn-footer li { padding: .22rem 0; font-size: .88rem; }
.ivn-footer a { color: var(--ivn-text-soft); text-decoration: none; }
.ivn-footer a:hover { color: var(--ivn-mint); }
.ivn-footer .ivn-reg { font-family: var(--ivn-mono); font-size: .78rem; color: var(--ivn-text-dim); }
.ivn-footer-base {
  border-top: 1px solid var(--ivn-line); margin-top: 2.4rem; padding-top: 1.3rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: .6rem;
  font-size: .78rem; color: var(--ivn-text-dim);
}
.ivn-footer-base span:last-child { font-family: var(--ivn-mono); }

/* ---------------- inner content pages ---------------- */
.ivn-page-head {
  position: relative; overflow: hidden;
  padding: 4rem 0 2.4rem; border-bottom: 1px solid var(--ivn-line);
  background:
    radial-gradient(560px 300px at 88% -20%, rgba(127,120,255,.14), transparent 62%),
    var(--ivn-bg);
}
.ivn-page-head h1 { font-size: clamp(2.1rem, 5vw, 3.1rem); margin: 1rem 0 .7rem; }
.ivn-page-head p { color: var(--ivn-text-soft); max-width: 62ch; margin: 0; font-size: 1.05rem; }

.ivn-prose { max-width: 74ch; }
.ivn-prose h2 { font-size: 1.4rem; margin: 2.2rem 0 .7rem; }
.ivn-prose h3 { font-size: 1.08rem; margin: 1.5rem 0 .4rem; color: var(--ivn-text); }
.ivn-prose p, .ivn-prose li { color: var(--ivn-text-soft); }
.ivn-prose ul { padding-left: 1.2rem; }
.ivn-prose li { margin: .35rem 0; }
.ivn-prose a { color: var(--ivn-mint); }
.ivn-prose strong { color: var(--ivn-text); }
.ivn-note {
  font-family: var(--ivn-mono); font-size: .82rem; color: var(--ivn-text-soft);
  border-left: 3px solid var(--ivn-mint); padding: .5rem 0 .5rem 1rem; margin: 1.6rem 0;
  background: rgba(52,227,196,.04);
}

/* detailed service list (services.html) */
.ivn-detail { display: grid; gap: 1.1rem; }
.ivn-detail-item {
  display: grid; grid-template-columns: 56px 1fr; gap: 1.3rem;
  border: 1px solid var(--ivn-line); border-radius: var(--ivn-r);
  background: var(--ivn-panel); padding: 1.5rem 1.5rem;
}
.ivn-detail-ic { width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(127,120,255,.1); border: 1px solid var(--ivn-line-2); color: var(--ivn-iris-2); }
.ivn-detail-ic svg { width: 24px; height: 24px; }
.ivn-detail-item h3 { font-size: 1.22rem; margin: 0 0 .5rem; }
.ivn-detail-item p { margin: 0 0 .8rem; color: var(--ivn-text-soft); }
.ivn-detail-item ul { margin: 0; padding-left: 1.15rem; }
.ivn-detail-item li { color: var(--ivn-text-soft); font-size: .92rem; margin: .25rem 0; }

/* contact page */
.ivn-contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.6rem; }
.ivn-contact-card {
  border: 1px solid var(--ivn-line); border-radius: var(--ivn-r);
  background: var(--ivn-panel); padding: 1.6rem 1.6rem;
}
.ivn-contact-card h3 { font-size: 1.15rem; margin: 0 0 .7rem; }
.ivn-contact-card p { color: var(--ivn-text-soft); margin: .3rem 0; }
.ivn-contact-mail {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--ivn-mono); font-size: .98rem; color: var(--ivn-mint);
  text-decoration: none; margin-top: .3rem;
}
.ivn-contact-mail:hover { text-decoration: underline; }
.ivn-contact-card ul { margin: .6rem 0 0; padding-left: 1.15rem; }
.ivn-contact-card li { color: var(--ivn-text-soft); font-size: .92rem; margin: .3rem 0; }

/* scroll reveal (progressive enhancement) */
.ivn-reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.ivn-reveal.ivn-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .ivn-reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------------- responsive ---------------- */
@media (max-width: 900px) {
  .ivn-hero-grid, .ivn-about, .ivn-contact-grid { grid-template-columns: 1fr; }
  .ivn-services, .ivn-stack-groups, .ivn-principles { grid-template-columns: repeat(2, 1fr); }
  .ivn-console { max-width: 460px; }
}
@media (max-width: 720px) {
  .ivn-burger { display: inline-flex; }
  .ivn-nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: .2rem;
    background: var(--ivn-bg-2); border-bottom: 1px solid var(--ivn-line);
    padding: .7rem 1.6rem 1.1rem;
  }
  .ivn-nav.ivn-open { display: flex; }
  .ivn-nav a { padding: .6rem 0; }
  .ivn-nav-cta { text-align: center; margin-top: .4rem; }
  .ivn-services, .ivn-stack-groups, .ivn-principles { grid-template-columns: 1fr; }
  .ivn-flow-step { grid-template-columns: 60px 1fr; gap: 1rem; }
  .ivn-detail-item { grid-template-columns: 1fr; gap: .9rem; }
  .ivn-footer-grid { grid-template-columns: 1fr; gap: 1.8rem; }
  .ivn-hero { padding-top: 3.4rem; }
}