/* Vitaliy Mogilevskiy — portfolio
   Palette drawn from the header photo: desert dusk amber over slate sky and granite. */

:root {
  --bg: #121417;
  --bg-raised: #1a1d22;
  --bg-sunk: #0d0f11;
  --line: #2a2f37;
  --line-strong: #3a414c;
  --text: #ebe6dc;
  --text-dim: #a7a196;
  --text-faint: #7b766d;
  --amber: #e9a640;
  --amber-soft: rgba(233, 166, 64, 0.12);
  --sky: #8fa6bf;
  --sky-soft: rgba(143, 166, 191, 0.12);
  --sage: #9db58a;
  --sage-soft: rgba(157, 181, 138, 0.12);
  --rose: #d98c7a;

  --font-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --font-display: "Fraunces", Georgia, serif;

  --radius: 10px;
  --maxw: 1180px;
  --gutter: 16px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.65;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--amber); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
::selection { background: var(--amber); color: #121417; }

/* ---------- Masthead ---------- */
.masthead {
  position: relative;
  background:
    linear-gradient(180deg, rgba(18,20,23,0.15) 0%, rgba(18,20,23,0.35) 55%, var(--bg) 100%),
    url("../img/header.jpg") center 40% / cover no-repeat;
  min-height: 230px;
  display: flex;
  flex-direction: column;
}
.masthead.tall { min-height: 340px; }
.nav {
  max-width: var(--maxw);
  width: 100%;
  margin: 0 auto;
  padding: 18px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--text);
  background: rgba(13,15,17,0.55);
  padding: 6px 10px;
  border-radius: 6px;
  backdrop-filter: blur(4px);
}
.brand b { color: var(--amber); font-weight: 600; }
.nav ul {
  list-style: none; margin: 0; padding: 4px;
  display: flex; gap: 2px; flex-wrap: wrap;
  background: rgba(13,15,17,0.55);
  border-radius: 8px;
  backdrop-filter: blur(4px);
}
.nav a {
  display: block;
  color: var(--text);
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 6px;
}
.nav a:hover { background: rgba(255,255,255,0.08); text-decoration: none; }
.nav a[aria-current="page"] { background: var(--amber); color: #121417; font-weight: 600; }

.mast-title {
  max-width: var(--maxw);
  width: 100%;
  margin: auto auto 0;
  padding: 0 var(--gutter) 22px;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 10px;
  display: inline-block;
  background: rgba(13,15,17,0.6);
  padding: 4px 9px;
  border-radius: 5px;
  backdrop-filter: blur(4px);
}
.mast-title h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0;
  max-width: 22ch;
  text-shadow: 0 2px 18px rgba(0,0,0,0.45);
}
.mast-title h1 em { font-style: italic; color: var(--amber); }

/* ---------- Layout ---------- */
.layout {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px var(--gutter) 64px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 48px;
  align-items: start;
}
main { min-width: 0; }

/* ---------- Sidebar profile ---------- */
.profile {
  position: sticky;
  top: 20px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
}
.profile .photo {
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: center 30%;
  border-radius: 10px;
  margin-bottom: 16px;
  border: 1px solid var(--line-strong);
}
.profile h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 22px;
  margin: 0;
  line-height: 1.2;
}
.profile .role { color: var(--amber); font-size: 14px; margin: 4px 0 2px; font-weight: 500; }
.profile .where { color: var(--text-faint); font-size: 13.5px; margin: 0 0 14px; }
.profile .pitch { font-size: 14px; color: var(--text-dim); margin: 0 0 16px; line-height: 1.55; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--amber);
  color: #15120c;
  font-weight: 600;
  font-size: 14.5px;
  padding: 10px 16px;
  border-radius: 8px;
  border: 0;
  cursor: pointer;
  font-family: inherit;
}
.btn:hover { text-decoration: none; filter: brightness(1.07); }
.btn.block { width: 100%; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line-strong); }
.profile .links { list-style: none; padding: 0; margin: 16px 0 0; font-size: 13.5px; }
.profile .links li { padding: 7px 0; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 8px; }
.profile .links span { color: var(--text-faint); }
.status {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 12.5px; color: var(--sage);
  background: var(--sage-soft);
  padding: 3px 10px; border-radius: 99px; margin-bottom: 12px;
}
.status::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--sage); }

/* ---------- Typography ---------- */
main h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(24px, 3vw, 31px);
  line-height: 1.2;
  margin: 56px 0 14px;
  letter-spacing: -0.005em;
}
main h2:first-child { margin-top: 8px; }
main h3 { font-size: 18px; font-weight: 600; margin: 32px 0 8px; line-height: 1.35; }
main p { margin: 0 0 16px; }
.lede { font-size: 19px; line-height: 1.6; color: var(--text); max-width: 62ch; }
.muted { color: var(--text-dim); }
.small { font-size: 14px; }
.section-kicker {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-faint); margin: 56px 0 -6px;
}
main ul.clean { padding-left: 20px; margin: 0 0 16px; }
main ul.clean li { margin-bottom: 6px; }
code, .mono { font-family: var(--font-mono); font-size: 0.88em; }
:not(pre) > code { background: var(--bg-sunk); border: 1px solid var(--line); padding: 1px 6px; border-radius: 5px; }
pre {
  background: var(--bg-sunk);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  margin: 0 0 20px;
  color: #d9d3c7;
}
pre .c { color: var(--text-faint); }
pre .k { color: var(--amber); }
pre .s { color: var(--sage); }
pre .h { color: var(--sky); }
pre .r { color: var(--rose); }
.code-label {
  font-family: var(--font-mono); font-size: 12px; color: var(--text-faint);
  margin: 0 0 6px;
}

/* ---------- Thesis / callout ---------- */
.thesis {
  border-left: 3px solid var(--amber);
  background: linear-gradient(90deg, var(--amber-soft), transparent 80%);
  padding: 18px 22px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 24px 0 28px;
}
.thesis p { margin: 0; font-size: 18px; line-height: 1.55; }
.thesis p + p { margin-top: 10px; font-size: 15.5px; color: var(--text-dim); }

/* ---------- Stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 28px 0 8px;
}
.stat { background: var(--bg-raised); padding: 16px 16px 14px; }
.stat .n {
  font-family: var(--font-display);
  font-size: 30px; line-height: 1.1; color: var(--amber); font-weight: 500;
}
.stat .l { font-size: 13px; color: var(--text-dim); margin-top: 6px; line-height: 1.4; }
.stats-note { font-size: 12.5px; color: var(--text-faint); margin: 0 0 8px; }

/* ---------- Split: judgment vs determinism ---------- */
.split {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 20px 0 24px;
}
.split .col {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 8px;
  background: var(--bg-raised);
}
.split .col h3 { margin: 0 0 4px; font-size: 16px; }
.split .col .tag {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase;
  display: inline-block; margin-bottom: 10px; padding: 2px 8px; border-radius: 4px;
}
.split .col.ai .tag { color: var(--sky); background: var(--sky-soft); }
.split .col.det .tag { color: var(--amber); background: var(--amber-soft); }
.split .col.human .tag { color: var(--sage); background: var(--sage-soft); }
.split ul { padding-left: 18px; margin: 8px 0 12px; font-size: 14.5px; color: var(--text-dim); }
.split li { margin-bottom: 5px; }
.split.three { grid-template-columns: repeat(3, 1fr); }

/* ---------- Pipeline diagram ---------- */
.pipeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  margin: 24px 0 10px;
  counter-reset: stage;
}
.stage {
  position: relative;
  padding: 14px 14px 14px;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  margin-right: 18px;
  border-radius: var(--radius);
  font-size: 13.5px;
  line-height: 1.45;
}
.stage:last-child { margin-right: 0; }
.stage:not(:last-child)::after {
  content: "";
  position: absolute; right: -15px; top: 50%;
  width: 12px; height: 12px;
  border-top: 2px solid var(--text-faint);
  border-right: 2px solid var(--text-faint);
  transform: translateY(-50%) rotate(45deg);
}
.stage .who {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 6px; display: block;
}
.stage strong { display: block; font-size: 14.5px; margin-bottom: 4px; color: var(--text); }
.stage span.d { color: var(--text-dim); }
.stage code { background: none; border: 0; padding: 0; color: var(--amber); word-break: break-word; }
.stage.human { border-top: 3px solid var(--sage); }
.stage.human .who { color: var(--sage); }
.stage.ai { border-top: 3px solid var(--sky); }
.stage.ai .who { color: var(--sky); }
.stage.det { border-top: 3px solid var(--amber); }
.stage.det .who { color: var(--amber); }
.loop {
  margin: 10px 0 24px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 13.5px;
  color: var(--text-dim);
  display: flex; gap: 12px; align-items: flex-start;
}
.loop .ico { font-family: var(--font-mono); color: var(--amber); font-size: 16px; line-height: 1.3; }

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 20px 0; }
.card {
  display: block;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  border-radius: 12px;
  padding: 20px;
  color: var(--text);
  transition: border-color .15s ease, transform .15s ease;
}
a.card:hover { border-color: var(--amber); text-decoration: none; transform: translateY(-2px); }
.card .k { font-family: var(--font-mono); font-size: 12px; color: var(--amber); letter-spacing: 0.06em; }
.card h3 { margin: 6px 0 8px; font-size: 19px; }
.card p { color: var(--text-dim); font-size: 14.5px; margin: 0 0 10px; }
.card .more { font-size: 14px; color: var(--amber); }
.card.wide { grid-column: 1 / -1; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; margin: 16px 0 24px; border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; color: var(--text-dim); font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.06em; background: var(--bg-raised); }
tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }
td.num { font-family: var(--font-mono); color: var(--amber); white-space: nowrap; }

/* ---------- Runbook catalog ---------- */
.catalog { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 16px 0 24px; }
.catalog .group { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; background: var(--bg-raised); }
.catalog h4 { margin: 0 0 8px; font-size: 13px; font-family: var(--font-mono); color: var(--amber); letter-spacing: 0.06em; text-transform: uppercase; font-weight: 500; }
.catalog ul { list-style: none; padding: 0; margin: 0; font-size: 13.5px; }
.catalog li { padding: 4px 0; color: var(--text-dim); }
.catalog li code { color: var(--text); background: none; border: 0; padding: 0; }

/* ---------- Timeline ---------- */
.timeline { list-style: none; padding: 0; margin: 20px 0 24px; border-left: 2px solid var(--line-strong); }
.timeline li { position: relative; padding: 0 0 20px 22px; }
.timeline li::before {
  content: ""; position: absolute; left: -7px; top: 7px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--amber);
}
.timeline .when { font-family: var(--font-mono); font-size: 12.5px; color: var(--amber); }
.timeline strong { display: block; margin: 2px 0 2px; }
.timeline p { margin: 0; color: var(--text-dim); font-size: 14.5px; }

/* ---------- Roles (experience) ---------- */
.role-block { border-top: 1px solid var(--line); padding-top: 26px; margin-top: 30px; }
.role-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.role-head h2 { margin: 0; }
.role-head .dates { font-family: var(--font-mono); font-size: 13px; color: var(--text-faint); }
.role-title { color: var(--amber); margin: 4px 0 14px; font-weight: 500; }
.project { margin: 18px 0 0; padding-left: 16px; border-left: 2px solid var(--line-strong); }
.project h3 { margin: 0 0 4px; font-size: 16.5px; }
.project h3 .code-name { font-family: var(--font-mono); font-size: 13px; color: var(--text-faint); font-weight: 400; margin-left: 6px; }
.project p { color: var(--text-dim); font-size: 15px; margin: 0 0 6px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 0; padding: 0; list-style: none; }
.chips li { font-family: var(--font-mono); font-size: 11.5px; color: var(--text-dim); border: 1px solid var(--line-strong); padding: 2px 8px; border-radius: 99px; }

/* ---------- Contact form ---------- */
.form { display: grid; gap: 16px; margin: 20px 0; max-width: 620px; }
.form label { display: grid; gap: 6px; font-size: 14px; color: var(--text-dim); }
.form input, .form textarea, .form select {
  font: inherit; color: var(--text);
  background: var(--bg-sunk);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 11px 12px;
  width: 100%;
}
.form textarea { min-height: 160px; resize: vertical; }
.form input:focus, .form textarea:focus, .form select:focus { outline: 2px solid var(--amber); outline-offset: 1px; border-color: transparent; }
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.hidden { position: absolute; left: -9999px; }

/* ---------- Footer ---------- */
footer.site {
  border-top: 1px solid var(--line);
  padding: 24px var(--gutter) 36px;
  max-width: var(--maxw);
  margin: 0 auto;
  font-size: 13px;
  color: var(--text-faint);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; gap: 32px; }
  .profile { position: static; display: grid; grid-template-columns: 120px 1fr; gap: 0 18px; align-items: start; }
  .profile .photo { margin: 0; grid-row: span 6; }
  .profile .links { grid-column: 1 / -1; }
  .pipeline { grid-template-columns: 1fr; }
  .stage { margin: 0 0 18px; }
  .stage:not(:last-child)::after { right: auto; left: 50%; top: auto; bottom: -15px; transform: translateX(-50%) rotate(135deg); }
}
@media (max-width: 720px) {
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split, .split.three, .cards, .catalog, .form .row { grid-template-columns: 1fr; }
  .masthead { min-height: 200px; }
  .masthead.tall { min-height: 280px; }
  body { font-size: 16px; }
  .lede { font-size: 17.5px; }
}
@media (max-width: 460px) {
  .profile { grid-template-columns: 88px 1fr; }
  .nav a { padding: 6px 9px; font-size: 13.5px; }
}