/* KOD.AI — company.kodai.com.pl
   Design language inherited from the KOD.AI brand site: deep black, amber accent,
   Montserrat, hairline borders, spec-sheet structure. Differentiator for this sibling:
   the live operating-topology signature in signal-green. */

:root {
  --bg: #0f0f0f;
  --bg-elevated: #161616;
  --bg-card: #1a1a1a;
  --bg-hover: #222222;
  --fg: #f5f5f4;
  --fg-muted: #d8d8d6;
  --fg-subtle: #b0b0ae;
  --fg-dim: #8f8f8d;
  --fg-faint: #6c6c6a;
  --line: #2a2a29;
  --line-strong: #3a3a38;
  --line-hairline: #1e1e1d;
  --accent: #fbbf24;          /* amber — KOD.AI engineering accent */
  --accent-dim: #d97706;
  --accent-soft: rgba(251, 191, 36, 0.12);
  --signal: #5eecb4;          /* signal green — "running / operating cycle" */
  --signal-soft: rgba(94, 236, 180, 0.12);
  --container: 1180px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --font: "Montserrat", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv05", "cv11";
}

.container { max-width: var(--container); margin-inline: auto; padding-inline: clamp(1.25rem, 4vw, 3rem); }

a { color: inherit; text-decoration: none; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--accent); color: #1a1200; padding: 8px 14px; border-radius: 4px; font-size: 14px;
}
.skip-link:focus { left: 12px; top: 12px; }

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

.display { font-weight: 500; letter-spacing: -0.028em; line-height: 1.05; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.6em;
  font-style: italic; font-size: 0.82rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--fg-dim); margin: 0;
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--accent); opacity: 0.85; }

.index-label { font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.04em; color: var(--fg-faint); margin: 0; }
.tabular { font-variant-numeric: tabular-nums; }

/* ---------- topbar ---------- */
.topbar { position: sticky; top: 0; z-index: 50; background: rgba(15,15,15,0.82); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line-hairline); }
.topbar-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--fg); }
.brand .mark { color: var(--fg-subtle); }
.wordmark { font-weight: 600; letter-spacing: 0.02em; font-size: 1.02rem; }
.wordmark .dot { color: var(--accent); }
.nav { display: flex; gap: 26px; margin-left: auto; }
.nav a { font-size: 0.9rem; color: var(--fg-subtle); transition: color 0.2s var(--ease); }
.nav a:hover { color: var(--fg); }
.topbar-cta { margin-left: 4px; }
.menu-toggle { display: none; }

.mobile-nav { display: none; }

/* ---------- buttons ---------- */
.cta { display: inline-flex; align-items: center; gap: 8px; font-size: 0.92rem; font-weight: 500; border-radius: 6px; padding: 11px 18px; transition: all 0.22s var(--ease); white-space: nowrap; }
.cta svg { transition: transform 0.22s var(--ease); }
.cta-primary { background: var(--accent); color: #1a1200; }
.cta-primary:hover { background: #ffce4d; transform: translateY(-1px); }
.cta-primary:hover svg { transform: translateX(3px); }
.cta-ghost { border: 1px solid var(--line-strong); color: var(--fg-muted); }
.cta-ghost:hover { border-color: var(--fg-dim); color: var(--fg); background: var(--bg-card); }
.cta-text { color: var(--fg-subtle); padding-inline: 4px; }
.cta-text:hover { color: var(--fg); }
.cta-text:hover svg { transform: translateX(3px); }

/* ---------- hero ---------- */
.hero { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(2rem, 5vw, 5rem); align-items: center; padding-block: clamp(3.5rem, 9vw, 7.5rem); }
.hero-copy { max-width: 36rem; }
.hero h1 { font-size: clamp(2.6rem, 6vw, 4.5rem); margin: 1.4rem 0 0; }
.lede { color: var(--fg-subtle); font-size: clamp(1.05rem, 1.5vw, 1.22rem); line-height: 1.55; max-width: 33ch; margin: 1.6rem 0 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 2.2rem; }

/* ---------- topology signature ---------- */
.topology { margin: 0; border: 1px solid var(--line); border-radius: 10px; background: linear-gradient(180deg, var(--bg-elevated), var(--bg)); padding: 18px 18px 14px; position: relative; }
.topo-caption { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--fg-dim); display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.run-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 0 var(--signal-soft); animation: pulse-ring 2.4s var(--ease) infinite; }
.topo-svg { width: 100%; height: auto; display: block; }
.topo-svg .node rect { fill: var(--bg-card); stroke: var(--line-strong); stroke-width: 1; }
.topo-svg .node-ceo rect { stroke: var(--accent); }
.topo-svg .node-owner rect { stroke: var(--line-strong); }
.topo-svg .node-leaf rect { fill: var(--bg-elevated); }
.topo-svg text { font-family: var(--mono); font-size: 8.5px; letter-spacing: 0.04em; fill: var(--fg-muted); }
.topo-svg .t-strong { font-size: 11px; font-weight: 500; fill: var(--fg); font-family: var(--font); }
.topo-svg .t-dim { fill: var(--fg-dim); font-size: 7.5px; }
.topo-svg .node-leaf text { fill: var(--fg-subtle); }
.topo-svg .cx { stroke: var(--accent); stroke-width: 1; }
.topo-svg .elabel { fill: var(--fg-faint); font-size: 7.5px; font-style: italic; }
.topo-svg .edges path { opacity: 0.9; }
.pulse { filter: drop-shadow(0 0 4px var(--signal)); }
.topo-legend { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line-hairline); font-size: 0.72rem; color: var(--fg-dim); }
.topo-legend span { display: inline-flex; align-items: center; gap: 7px; }
.topo-legend i { width: 16px; height: 0; border-top: 1px solid var(--line-strong); }
.sw-signal { border-top-color: var(--signal) !important; }
.sw-cross { width: 9px !important; height: 9px !important; border: 0 !important; position: relative; }
.sw-cross::before, .sw-cross::after { content: ""; position: absolute; background: var(--accent); }
.sw-cross::before { left: 4px; top: 0; width: 1px; height: 9px; }
.sw-cross::after { top: 4px; left: 0; height: 1px; width: 9px; }

@keyframes pulse-ring { 0% { box-shadow: 0 0 0 0 var(--signal-soft); } 70% { box-shadow: 0 0 0 9px transparent; } 100% { box-shadow: 0 0 0 0 transparent; } }

/* ---------- sections ---------- */
.section { padding-block: clamp(4rem, 9vw, 8rem); display: grid; grid-template-columns: 200px 1fr; gap: clamp(1.5rem, 4vw, 4rem); align-items: start; }
.section.alt { background: linear-gradient(180deg, var(--bg-elevated), var(--bg)); border-block: 1px solid var(--line-hairline); }
.section-head { position: sticky; top: 96px; display: flex; flex-direction: column; gap: 10px; }
.section-body h2.display { font-size: clamp(1.7rem, 3.1vw, 2.55rem); margin: 0; max-width: 22ch; }
.section.status .section-body h2, .contact h2 { max-width: 18ch; }
.prose { color: var(--fg-subtle); max-width: 60ch; margin: 1.2rem 0 0; font-size: 1.02rem; }

/* three-up points */
.three-up { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line-hairline); border: 1px solid var(--line-hairline); border-radius: 10px; overflow: hidden; margin-top: 2.4rem; }
.point { background: var(--bg); padding: 1.6rem 1.5rem; }
.point-k { font-weight: 600; color: var(--fg); margin: 0 0 0.5rem; font-size: 0.98rem; }
.point p:not(.point-k) { color: var(--fg-subtle); margin: 0; font-size: 0.92rem; line-height: 1.6; }

/* spec list */
.spec-list { list-style: none; margin: 2.4rem 0 0; padding: 0; border-top: 1px solid var(--line-hairline); }
.spec-list li { display: grid; grid-template-columns: 44px 1fr; gap: 18px; padding: 1.4rem 0; border-bottom: 1px solid var(--line-hairline); }
.spec-list .n { font-family: var(--mono); color: var(--accent); font-size: 0.85rem; padding-top: 2px; }
.spec-list b { font-weight: 600; }
.spec-list p { margin: 0.3rem 0 0; color: var(--fg-subtle); font-size: 0.93rem; }

/* flow */
.flow { list-style: none; margin: 2.4rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line-hairline); border: 1px solid var(--line-hairline); border-radius: 10px; overflow: hidden; }
.flow li { background: var(--bg); padding: 1.5rem 1.4rem; position: relative; }
.flow .fs { font-family: var(--mono); color: var(--fg-faint); font-size: 1.1rem; }
.flow li.end .fs { color: var(--signal); }
.flow b { display: block; margin: 0.5rem 0 0.4rem; font-weight: 600; }
.flow p { margin: 0; color: var(--fg-subtle); font-size: 0.9rem; line-height: 1.55; }
.flow li.end { background: linear-gradient(180deg, var(--signal-soft), transparent); }

/* card grid */
.card-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line-hairline); border: 1px solid var(--line-hairline); border-radius: 10px; overflow: hidden; margin-top: 2.4rem; }
.card { background: var(--bg); padding: 1.7rem 1.6rem; transition: background 0.22s var(--ease); }
.card:hover { background: var(--bg-card); }
.card-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; }
.card-i { font-family: var(--mono); color: var(--fg-faint); font-size: 0.85rem; }
.card h3 { margin: 0 0 0.6rem; font-size: 1.25rem; font-weight: 600; letter-spacing: -0.02em; }
.card p { margin: 0; color: var(--fg-subtle); font-size: 0.94rem; }
.card.built { background: linear-gradient(180deg, var(--accent-soft), transparent); }
.card.built:hover { background: linear-gradient(180deg, rgba(251,191,36,0.16), transparent); }
.badge { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; color: #1a1200; background: var(--accent); padding: 3px 9px; border-radius: 999px; }
.badge.muted { background: transparent; color: var(--fg-faint); border: 1px solid var(--line-strong); }

/* governance grid */
.gov-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line-hairline); border: 1px solid var(--line-hairline); border-radius: 10px; overflow: hidden; margin-top: 2.4rem; }
.gov { background: var(--bg); padding: 1.7rem 1.6rem; }
.gov p:not(.point-k) { color: var(--fg-subtle); margin: 0; font-size: 0.93rem; }

/* stats */
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line-hairline); border: 1px solid var(--line-hairline); border-radius: 10px; overflow: hidden; margin-top: 2.4rem; }
.stat { background: var(--bg); padding: 1.6rem 1.4rem; }
.stat-n { display: block; font-size: 1.5rem; font-weight: 600; letter-spacing: -0.02em; color: var(--fg); }
.stat-n .u { font-size: 0.8rem; color: var(--accent); vertical-align: super; }
.stat-l { display: block; margin-top: 0.4rem; color: var(--fg-dim); font-size: 0.85rem; }

/* contact */
.contact { display: block; }
.contact-card { border: 1px solid var(--line); border-radius: 14px; background: radial-gradient(120% 140% at 0% 0%, var(--accent-soft), transparent 55%), var(--bg-elevated); padding: clamp(2.2rem, 5vw, 4rem); text-align: left; }
.contact h2 { font-size: clamp(2rem, 4vw, 3.2rem); margin: 1.1rem 0 0; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line-hairline); padding-block: 2.4rem; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.brand.small .mark { color: var(--fg-dim); }
.foot-note { color: var(--fg-faint); font-size: 0.85rem; margin: 0; }

/* ---------- reveal: deterministic CSS load animation (ends visible; no JS/scroll dependency) ---------- */
@keyframes reveal-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
.js .reveal { animation: reveal-in 0.6s var(--ease) both; }
.js .reveal:nth-child(2) { animation-delay: 0.06s; }
.js .reveal:nth-child(3) { animation-delay: 0.12s; }
.js .reveal:nth-child(4) { animation-delay: 0.18s; }
.js .reveal:nth-child(5) { animation-delay: 0.24s; }
.js .reveal:nth-child(6) { animation-delay: 0.30s; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { animation: none; }
  .run-dot, .pulse { animation: none !important; }
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; gap: 2.5rem; }
  .topology { max-width: 520px; }
  .section { grid-template-columns: 1fr; gap: 1.4rem; }
  .section-head { position: static; flex-direction: row; align-items: center; gap: 14px; }
  .three-up, .flow, .stat-row { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav, .topbar-cta { display: none; }
  .menu-toggle { display: inline-flex; flex-direction: column; justify-content: center; gap: 5px; margin-left: auto; width: 40px; height: 40px; background: none; border: 1px solid var(--line-strong); border-radius: 7px; cursor: pointer; }
  .menu-toggle span { display: block; width: 16px; height: 1.5px; background: var(--fg-subtle); margin-inline: auto; transition: transform 0.25s var(--ease), opacity 0.2s; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.25px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.25px) rotate(-45deg); }
  .mobile-nav { display: grid; max-height: 0; overflow: hidden; transition: max-height 0.3s var(--ease); border-top: 1px solid var(--line-hairline); background: var(--bg-elevated); }
  .mobile-nav.open { max-height: 340px; }
  .mobile-nav a { padding: 14px clamp(1.25rem, 4vw, 3rem); border-bottom: 1px solid var(--line-hairline); color: var(--fg-subtle); font-size: 0.95rem; }
  .three-up, .flow, .card-grid, .gov-grid, .stat-row { grid-template-columns: 1fr; }
  .hero h1 { font-size: clamp(2.3rem, 10vw, 3rem); }
  .section-head { flex-direction: column; align-items: flex-start; gap: 6px; }
}