/* ===========================================================
   Ivan Lopatin — portfolio.velopilot.org
   Design system: warm near-black + ochre. IBM Plex superfamily.
   Deliberately outside the 200-290deg "AI gradient" hue band,
   no Inter, no three-equal-card grids, no centered stack.
   =========================================================== */

:root {
  /* Ink / surfaces — warm, not blue-black */
  --ink:        #13110e;
  --ink-2:      #1b1815;
  --ink-3:      #24201b;
  --paper:      #f4efe6;
  --paper-2:    #eae3d6;

  /* Type colors */
  --on-ink:     #f6f2ea;
  --on-ink-dim: #a49b8c;
  --on-ink-far: #6f665a;
  --on-paper:     #171410;
  --on-paper-dim: #5d554a;

  /* Accent: burnt ochre, hue ~22deg */
  --accent:      #c8642a;
  --accent-lift: #e07c3e;
  --accent-wash: rgba(200, 100, 42, 0.12);

  /* State semantics for before -> after */
  --before:      #8a8072;
  --after:       #5a9b7a;
  --after-wash:  rgba(90, 155, 122, 0.12);

  --line-ink:   rgba(246, 242, 234, 0.13);
  --line-ink-2: rgba(246, 242, 234, 0.07);
  --line-paper: rgba(23, 20, 16, 0.14);

  --font-display: "IBM Plex Serif", Georgia, "Times New Roman", serif;
  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --maxw: 1180px;
  --gut: clamp(20px, 4.2vw, 64px);
  --r: 3px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--on-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 { margin: 0; font-weight: 500; }
p { margin: 0; }
a { color: inherit; }

::selection { background: var(--accent); color: #fff; }

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

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut); }

/* Section eyebrow: number + label + rule. Used everywhere for rhythm. */
.eyebrow {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--on-ink-far);
  margin-bottom: 28px;
}
.eyebrow .num { color: var(--accent); font-weight: 600; }
.eyebrow .bar { flex: 1; height: 1px; background: var(--line-ink); }
.on-paper .eyebrow { color: var(--on-paper-dim); }
.on-paper .eyebrow .bar { background: var(--line-paper); }

/* ============================ NAV ============================ */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 60;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  background: rgba(19, 17, 14, 0.72);
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s;
}
.nav.scrolled { background: rgba(19, 17, 14, 0.94); border-bottom-color: var(--line-ink); }
.nav-in {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut);
  height: 62px; display: flex; align-items: center; gap: 22px;
}
.brand {
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.02em;
  text-decoration: none; white-space: nowrap; font-weight: 500;
}
.brand .dot { color: var(--accent); }
.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a {
  font-size: 13px; text-decoration: none; color: var(--on-ink-dim);
  transition: color .18s; white-space: nowrap;
}
.nav-links a:hover { color: var(--on-ink); }
@media (max-width: 880px) { .nav-links { display: none; } }

.lang {
  display: flex; border: 1px solid var(--line-ink); border-radius: 999px;
  overflow: hidden; margin-left: auto;
}
.nav-links + .lang { margin-left: 0; }
.lang button {
  appearance: none; background: none; border: 0; cursor: pointer;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em;
  color: var(--on-ink-far); padding: 6px 11px; transition: .18s;
}
.lang button[aria-pressed="true"] { background: var(--accent); color: #fff; }

/* ============================ HERO ============================ */
.hero { padding: 140px 0 84px; position: relative; overflow: hidden; }
.hero::before {
  /* single soft ochre bloom — not a gradient hero band */
  content: ""; position: absolute; width: 780px; height: 780px;
  right: -280px; top: -340px; border-radius: 50%;
  background: radial-gradient(circle, rgba(200,100,42,.14), transparent 62%);
  pointer-events: none;
}
.hero-grid {
  position: relative; display: grid;
  grid-template-columns: 1.22fr 0.78fr; gap: clamp(32px, 5vw, 72px);
  align-items: start;
}
@media (max-width: 960px) { .hero-grid { grid-template-columns: 1fr; } }

.status {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--on-ink-dim);
  border: 1px solid var(--line-ink); border-radius: 999px;
  padding: 6px 13px 6px 10px; margin-bottom: 26px;
}
.status .led {
  width: 6px; height: 6px; border-radius: 50%; background: var(--after);
  box-shadow: 0 0 0 3px rgba(90,155,122,.2);
  flex-shrink: 0; align-self: flex-start; margin-top: 5px;
}
@media (prefers-reduced-motion: no-preference) {
  .status .led { animation: pulseLed 2.6s ease-in-out infinite; }
}
@keyframes pulseLed { 0%,100% { box-shadow: 0 0 0 3px rgba(90,155,122,.2); } 50% { box-shadow: 0 0 0 6px rgba(90,155,122,0); } }

h1.headline {
  font-family: var(--font-display);
  font-size: clamp(34px, 4.4vw, 54px);
  line-height: 1.06; letter-spacing: -.022em;
  font-weight: 400; max-width: 19ch; text-wrap: balance;
}
h1.headline em { font-style: normal; color: var(--accent-lift); }

.hero-sub {
  margin-top: 26px; max-width: 54ch; font-size: clamp(15.5px, 1.5vw, 17.5px);
  line-height: 1.62; color: var(--on-ink-dim);
}
.hero-sub strong { color: var(--on-ink); font-weight: 500; }

.role-line {
  margin-top: 22px; font-family: var(--font-mono); font-size: 12px;
  letter-spacing: .04em; color: var(--on-ink-far);
}
.role-line b { color: var(--accent); font-weight: 500; }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 20px; border-radius: var(--r); text-decoration: none;
  font-size: 14px; font-weight: 500; border: 1px solid transparent;
  cursor: pointer; transition: transform .16s, background .2s, border-color .2s;
  font-family: var(--font-sans); min-height: 46px;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-lift); }
.btn-ghost { border-color: var(--line-ink); color: var(--on-ink); }
.btn-ghost:hover { border-color: var(--accent); }
.btn .k { font-family: var(--font-mono); font-size: 11px; opacity: .75; }

/* --- Hero ledger: the before -> after schema as the hook --- */
.ledger {
  border: 1px solid var(--line-ink); border-radius: var(--r);
  background: linear-gradient(180deg, var(--ink-2), rgba(27,24,21,0.4));
  padding: 4px 22px 18px;
}
.ledger-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 0 12px; border-bottom: 1px solid var(--line-ink-2);
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--on-ink-far);
}
.lrow { padding: 17px 0; border-bottom: 1px solid var(--line-ink-2); }
.lrow:last-child { border-bottom: 0; padding-bottom: 6px; }
.lrow .lab {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .11em;
  text-transform: uppercase; color: var(--on-ink-far); margin-bottom: 9px;
}
.lrow .states { display: flex; align-items: baseline; gap: 11px; flex-wrap: wrap; }
.lrow .was {
  font-size: 13px; color: var(--before); text-decoration: line-through;
  text-decoration-color: rgba(138,128,114,.5); text-decoration-thickness: 1px;
}
.lrow .arr { color: var(--accent); font-size: 12px; }
.lrow .now { display: flex; align-items: baseline; gap: 7px; }
.lrow .big {
  font-family: var(--font-display); font-size: 34px; line-height: 1;
  letter-spacing: -.03em; color: var(--on-ink); font-variant-numeric: tabular-nums;
}
/* word-type results must not outweigh the numeric ones */
.lrow .big:not([data-count]) { font-size: 22px; letter-spacing: -.02em; }
.lrow .unit { font-size: 13px; color: var(--on-ink-dim); }
.ledger-foot {
  margin-top: 14px; font-size: 11.5px; line-height: 1.45; color: var(--on-ink-far);
}

/* ============================ ASK / AI WIDGET ============================ */
.ask { padding: 30px 0 90px; }
.ask-shell {
  border: 1px solid var(--line-ink); border-radius: var(--r);
  background: var(--ink-2); overflow: hidden;
}
.ask-top {
  display: flex; align-items: center; gap: 12px; padding: 13px 18px;
  border-bottom: 1px solid var(--line-ink-2); background: rgba(0,0,0,.2);
}
.dots { display: flex; gap: 6px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: #3a342c; display: block; }
.dots i:first-child { background: var(--accent); }
.ask-title {
  font-family: var(--font-mono); font-size: 11.5px; color: var(--on-ink-far);
  letter-spacing: .04em;
}
.ask-badge {
  margin-left: auto; font-family: var(--font-mono); font-size: 10px;
  letter-spacing: .1em; text-transform: uppercase; color: var(--after);
  border: 1px solid rgba(90,155,122,.35); border-radius: 999px; padding: 4px 9px;
}
.ask-body { padding: 24px 18px 18px; }
.ask-lead { max-width: 60ch; margin-bottom: 20px; }
.ask-lead h2 {
  font-family: var(--font-display); font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.16; letter-spacing: -.02em; margin-bottom: 10px;
}
.ask-lead p { color: var(--on-ink-dim); font-size: 14.5px; }

.log {
  min-height: 132px; max-height: 420px; overflow-y: auto;
  display: flex; flex-direction: column; gap: 14px; padding: 4px 2px 14px;
  scrollbar-width: thin;
}
.msg { display: flex; gap: 11px; font-size: 14.5px; line-height: 1.58; }
.msg .who {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .1em;
  text-transform: uppercase; padding-top: 4px; flex-shrink: 0; width: 34px;
}
.msg.q .who { color: var(--on-ink-far); }
.msg.a .who { color: var(--accent); }
.msg .txt { flex: 1; min-width: 0; }
.msg.q .txt { color: var(--on-ink); font-weight: 500; }
.msg.a .txt { color: var(--on-ink-dim); }
.msg.a .txt strong { color: var(--on-ink); font-weight: 500; }
.msg .src {
  display: block; margin-top: 8px; font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: .05em; color: var(--on-ink-far);
}
.msg .src b { color: var(--after); font-weight: 500; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0 16px; }
.chip {
  appearance: none; cursor: pointer; font-family: var(--font-sans);
  background: rgba(246,242,234,.04); border: 1px solid var(--line-ink);
  color: var(--on-ink-dim); border-radius: 999px; padding: 8px 13px;
  font-size: 12.5px; transition: .18s; text-align: left;
}
.chip:hover { border-color: var(--accent); color: var(--on-ink); background: var(--accent-wash); }
/* the chip that performs an action rather than asking a question */
.chip-act {
  border-color: rgba(200,100,42,.55); color: var(--accent-lift);
  background: var(--accent-wash); font-weight: 500;
}
.chip-act::before { content: "↳ "; opacity: .8; }
.msg .txt a { color: var(--accent-lift); text-underline-offset: 3px; }

/* numbers that cannot be clicked but can be defended in an interview */
.numrow {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  margin-top: 34px; background: var(--rule); border: 1px solid var(--rule);
}
.numcell { background: var(--ink); padding: 20px 18px; }
.numcell b {
  display: block; font-family: var(--font-display); font-size: 25px;
  color: var(--accent-lift); letter-spacing: -.02em; margin-bottom: 7px;
}
.numcell span { font-size: 12.5px; color: var(--on-ink-dim); line-height: 1.45; display: block; }
@media (max-width: 860px) { .numrow { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .numrow { grid-template-columns: 1fr; } }

.ask-form { display: flex; gap: 9px; }
.ask-form input {
  flex: 1; min-width: 0; background: var(--ink); color: var(--on-ink);
  border: 1px solid var(--line-ink); border-radius: var(--r);
  padding: 13px 15px; font-family: var(--font-sans); font-size: 14.5px;
  min-height: 46px;
}
.ask-form input::placeholder { color: var(--on-ink-far); }
.ask-form input:focus { outline: none; border-color: var(--accent); }
.ask-note {
  margin-top: 12px; font-size: 11.5px; color: var(--on-ink-far);
  line-height: 1.5; max-width: 76ch;
}

/* ============================ CASES (inverted paper) ============================ */
.on-paper { background: var(--paper); color: var(--on-paper); }
.cases { padding: 92px 0 96px; }
.sec-head { max-width: 62ch; margin-bottom: 52px; }
.sec-head h2 {
  font-family: var(--font-display); font-size: clamp(28px, 3.8vw, 46px);
  line-height: 1.1; letter-spacing: -.024em; text-wrap: balance;
}
.sec-head p { margin-top: 16px; font-size: 16px; color: var(--on-paper-dim); line-height: 1.6; }

.case { padding: 40px 0; border-top: 1px solid var(--line-paper); }
.case:first-of-type { border-top: 2px solid var(--on-paper); }
.case-head {
  display: grid; grid-template-columns: auto 1fr auto; gap: 18px;
  align-items: baseline; margin-bottom: 26px;
}
.case-n {
  font-family: var(--font-mono); font-size: 12px; color: var(--accent);
  letter-spacing: .1em; font-weight: 600;
}
.case-head h3 {
  font-family: var(--font-display); font-size: clamp(21px, 2.5vw, 29px);
  line-height: 1.18; letter-spacing: -.02em;
}
.case-yr {
  font-family: var(--font-mono); font-size: 11px; color: var(--on-paper-dim);
  letter-spacing: .08em; white-space: nowrap;
}
@media (max-width: 700px) {
  .case-head { grid-template-columns: auto 1fr; }
  .case-yr { grid-column: 2; }
}

/* the было / внедрено / стало progression — asymmetric on purpose */
.flow { display: grid; grid-template-columns: 1fr auto 1.24fr auto 1fr; gap: 0; align-items: stretch; }
@media (max-width: 900px) { .flow { grid-template-columns: 1fr; } }

.stage { padding: 20px 22px; position: relative; }
.stage:first-child { padding-left: 0; }
.stage:last-child { padding-right: 0; }
.stage .st-lab {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .15em;
  text-transform: uppercase; margin-bottom: 12px; font-weight: 600;
}
.stage.was .st-lab { color: var(--before); }
.stage.did .st-lab { color: var(--accent); }
.stage.now .st-lab { color: var(--after); }
.stage p { font-size: 14.5px; line-height: 1.56; color: var(--on-paper-dim); }
.stage.was p { color: #6b6357; }
.stage.did { background: rgba(200,100,42,.055); border-radius: var(--r); }
.stage.now { background: var(--after-wash); border-radius: var(--r); }

.stage.did ul { margin: 0; padding-left: 17px; }
.stage.did li {
  font-size: 14.5px; line-height: 1.5; color: var(--on-paper); margin-bottom: 8px;
}
.stage.did li::marker { color: var(--accent); }

.connector {
  display: flex; align-items: center; justify-content: center;
  padding: 0 6px; color: var(--accent); font-size: 17px;
}
@media (max-width: 900px) {
  .connector { padding: 6px 0; transform: rotate(90deg); }
  .stage { padding: 18px 16px; }
  .stage:first-child, .stage:last-child { padding-left: 16px; padding-right: 16px; }
}

.result-num {
  font-family: var(--font-display); font-size: clamp(34px, 4.6vw, 52px);
  line-height: 1; letter-spacing: -.035em; color: var(--on-paper);
  font-variant-numeric: tabular-nums; margin-bottom: 8px;
}
.result-num small { font-size: .44em; color: var(--on-paper-dim); letter-spacing: 0; }
.stage.now .sub { font-size: 13px; line-height: 1.5; color: #4d6b5c; margin-top: 8px; }

.tagrow { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 22px; }
.tag {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .05em;
  border: 1px solid var(--line-paper); border-radius: 2px;
  padding: 5px 9px; color: var(--on-paper-dim);
}
.adopt {
  margin-top: 18px; padding-left: 15px; border-left: 2px solid var(--after);
  font-size: 13.5px; line-height: 1.55; color: var(--on-paper-dim);
}
.adopt b { color: var(--on-paper); font-weight: 500; }

/* ============================ PROOF ============================ */
.proof { padding: 88px 0; border-top: 1px solid var(--line-ink); }
.proof-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 860px) { .proof-grid { grid-template-columns: 1fr; } }
.pcard {
  border: 1px solid var(--line-ink); border-radius: var(--r);
  padding: 24px; background: var(--ink-2); text-decoration: none;
  display: block; transition: border-color .2s, transform .2s;
}
a.pcard:hover { border-color: var(--accent); transform: translateY(-2px); }
.pcard .pc-top {
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--on-ink-far); margin-bottom: 18px;
}
.pcard .pc-top .ext { color: var(--accent); }
.metrics { display: flex; flex-wrap: wrap; gap: 26px; }
.metrics div span {
  display: block; font-family: var(--font-display); font-size: 27px;
  line-height: 1.1; letter-spacing: -.028em; font-variant-numeric: tabular-nums;
}
.metrics div small {
  display: block; margin-top: 3px; font-size: 11px; color: var(--on-ink-far);
  font-family: var(--font-mono); letter-spacing: .05em;
}
.pcard .pc-note { margin-top: 18px; font-size: 13px; line-height: 1.5; color: var(--on-ink-dim); }

/* four live products: 2x2 so none is left orphaned on its own row */
.bots { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 14px; }
@media (max-width: 640px) { .bots { grid-template-columns: 1fr; } }
@media (max-width: 860px) { .bots { grid-template-columns: 1fr; } }
.bot {
  border: 1px solid var(--line-ink); border-radius: var(--r); padding: 20px;
  text-decoration: none; display: flex; flex-direction: column; gap: 8px;
  transition: border-color .2s, background .2s;
}
.bot:hover { border-color: var(--accent); background: var(--accent-wash); }
.bot b { font-size: 15px; font-weight: 500; }
.bot p { font-size: 13px; color: var(--on-ink-dim); line-height: 1.5; flex: 1; }
.bot code {
  font-family: var(--font-mono); font-size: 11px; color: var(--accent);
  letter-spacing: .02em;
}

/* ============================ METHOD ============================ */
.method { padding: 88px 0; border-top: 1px solid var(--line-ink); }
.method-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(30px, 5vw, 70px); }
@media (max-width: 900px) { .method-grid { grid-template-columns: 1fr; } }
.steps { counter-reset: s; }
.step-i {
  display: grid; grid-template-columns: 34px 1fr; gap: 16px;
  padding: 17px 0; border-top: 1px solid var(--line-ink-2);
}
.step-i:first-child { border-top: 0; }
.step-i::before {
  counter-increment: s; content: counter(s, decimal-leading-zero);
  font-family: var(--font-mono); font-size: 11px; color: var(--accent);
  padding-top: 3px; letter-spacing: .06em;
}
.step-i b { display: block; font-size: 15.5px; font-weight: 500; margin-bottom: 5px; }
.step-i span { font-size: 13.5px; color: var(--on-ink-dim); line-height: 1.55; }

/* ============================ BOUNDARIES ============================ */
.bounds { padding: 84px 0; border-top: 1px solid var(--line-ink); background: var(--ink-2); }
.bd-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 34px; }
@media (max-width: 860px) { .bd-grid { grid-template-columns: 1fr; } }
.bd {
  border: 1px solid var(--line-ink); border-radius: var(--r);
  padding: 24px; background: var(--ink);
}
.bd.yes { border-top: 2px solid var(--after); }
.bd.no  { border-top: 2px solid var(--accent); }
.bd h3 {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .13em;
  text-transform: uppercase; margin-bottom: 16px;
}
.bd.yes h3 { color: var(--after); }
.bd.no h3  { color: var(--accent); }
.bd ul { margin: 0; padding-left: 17px; }
.bd li { font-size: 13.5px; line-height: 1.55; color: var(--on-ink-dim); margin-bottom: 10px; }
.bd li::marker { color: var(--on-ink-far); }

/* ============================ CONTACT ============================ */
.contact { padding: 96px 0 40px; border-top: 1px solid var(--line-ink); }
.contact h2 {
  font-family: var(--font-display); font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1.08; letter-spacing: -.026em; max-width: 18ch; text-wrap: balance;
}
.contact p { margin-top: 18px; max-width: 52ch; color: var(--on-ink-dim); font-size: 16px; }
.clinks { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 32px; }

.foot {
  margin-top: 70px; padding: 24px 0 40px; border-top: 1px solid var(--line-ink-2);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .07em;
  text-transform: uppercase; color: var(--on-ink-far);
}

/* ============================ MOTION ============================ */
.reveal { opacity: 0; transform: translateY(16px); }
@media (prefers-reduced-motion: no-preference) {
  .reveal { transition: opacity .7s cubic-bezier(.22,.61,.36,1), transform .7s cubic-bezier(.22,.61,.36,1); }
}
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

@media print {
  .nav, .ask, .chips, .ask-form { display: none; }
  body { background: #fff; color: #000; }
}