/* Ivan Ermakov - personal landing
   Palette: printed programme plan, reviewed with a highlighter.
   paper #F7F7F2 · ink #1A2E28 · muted #5A6A62 · rule #D9DED6 · marker #FFE066 */

@font-face {
  font-family: "Archivo Black";
  src: url("../fonts/archivo-black-v23-latin-regular.woff2") format("woff2");
  font-weight: 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans-v23-latin-regular.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans-v23-latin-600.woff2") format("woff2");
  font-weight: 600; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/ibm-plex-mono-v20-latin-regular.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/ibm-plex-mono-v20-latin-500.woff2") format("woff2");
  font-weight: 500; font-style: normal; font-display: swap;
}

:root {
  --paper: #F7F7F2;
  --ink: #1A2E28;
  --muted: #5A6A62;
  --rule: #D9DED6;
  --marker: #FFE066;
  --maxw: 1020px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.mono {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

a { color: var(--ink); }
a:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }

.mark {
  background: linear-gradient(transparent 8%, var(--marker) 8%, var(--marker) 92%, transparent 92%);
  padding: 0 0.12em;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

/* ---------- layout shells ---------- */
main > section, main > article, .topbar, .footer {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
}

.eyebrow {
  color: var(--muted);
  font-weight: 500;
  margin-bottom: 2rem;
  border-top: 1px solid var(--ink);
  padding-top: 0.75rem;
}

/* ---------- topbar ---------- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-top: 22px;
  padding-bottom: 22px;
}
.topbar .mono { font-weight: 500; }
.topbar nav { display: flex; gap: 1.5rem; }
.topbar nav a { text-decoration: none; }
.topbar nav a:hover { background: var(--marker); }

/* ---------- hero ---------- */
.hero { padding-top: 9vh; padding-bottom: 5rem; }

.hero h1 {
  font-family: "Archivo Black", "IBM Plex Sans", sans-serif;
  font-weight: 900;
  font-size: clamp(2.1rem, 5.6vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  text-transform: none;
  max-width: 18ch;
  margin-bottom: 1.75rem;
}

.lede {
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  max-width: 58ch;
  color: var(--ink);
  margin-bottom: 2rem;
}

.factrow {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0;
  color: var(--muted);
  margin-bottom: 2.5rem;
}
.factrow li { white-space: nowrap; }
.factrow li:not(:last-child)::after {
  content: "·";
  margin-inline: 0.9em;
  color: var(--rule);
}

/* ---------- buttons ---------- */
.cta { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.btn {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-decoration: none;
  border: 1.5px solid var(--ink);
  padding: 0.7em 1.3em;
  transition: background 0.15s ease;
}
.btn:hover { background: var(--marker); }
.btn-solid { background: var(--ink); color: var(--paper); }
.btn-solid:hover { background: var(--ink); box-shadow: 4px 4px 0 var(--marker); }

/* ---------- gantt ---------- */
.plan { padding-bottom: 5rem; }

.gantt { position: relative; }

.gantt-years {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.4rem;
  margin-bottom: 1.1rem;
}

.gantt-row { margin-bottom: 0.9rem; }

.gantt-bar {
  position: relative;
  margin-left: var(--start);
  width: var(--width);
  min-width: 4px;
  height: 14px;
  background: var(--ink);
  animation: grow 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) both;
  transform-origin: left center;
}
.gantt-row:nth-child(3) .gantt-bar { animation-delay: 0.12s; }
.gantt-row:nth-child(4) .gantt-bar { animation-delay: 0.24s; }
.gantt-row:nth-child(5) .gantt-bar { animation-delay: 0.36s; }
.gantt-row:nth-child(6) .gantt-bar { animation-delay: 0.48s; }

.gantt-bar-ai { background: var(--marker); }

@keyframes grow { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@media (prefers-reduced-motion: reduce) {
  .gantt-bar { animation: none; }
  html { scroll-behavior: auto; }
}

.gantt-label {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  white-space: nowrap;
  color: var(--muted);
  font-weight: 500;
  left: calc(100% + 10px);
}
/* labels for late-starting bars flip to the left to avoid right-edge overflow */
.gantt-row:nth-child(4) .gantt-label,
.gantt-row:nth-child(5) .gantt-label,
.gantt-row:nth-child(6) .gantt-label {
  left: auto;
  right: calc(100% + 10px);
}

/* ---------- work / cases ---------- */
.work { padding-bottom: 5rem; }

.case {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 1rem 3rem;
  padding-block: 1.6rem;
  border-bottom: 1px solid var(--rule);
}
.case:last-child { border-bottom: none; }

.case h2 {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.35;
}
.case p { color: var(--ink); max-width: 62ch; }

/* ---------- AI section ---------- */
.ai { padding-bottom: 5rem; }

.ai-grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 2rem 4rem;
}

.ai h2 { font-size: 1.15rem; font-weight: 600; margin-bottom: 1rem; }

.list { list-style: none; }
.list li {
  padding-left: 1.4rem;
  position: relative;
  margin-bottom: 0.9rem;
  max-width: 60ch;
}
.list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--muted);
}
.list-quiet li { color: var(--muted); }

.aside {
  border-left: 3px solid var(--marker);
  padding-left: 1rem;
  font-weight: 600;
  max-width: 40ch;
}

/* ---------- credentials ---------- */
.creds { padding-bottom: 5rem; }
.credlist {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.7rem 2rem;
  color: var(--muted);
  font-weight: 500;
}
.credlist li::before { content: "▪ "; color: var(--ink); }

/* ---------- contact ---------- */
.contact { padding-bottom: 5rem; }
.contact h2 {
  font-family: "Archivo Black", sans-serif;
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.15;
  max-width: 22ch;
  margin-bottom: 2rem;
}

/* ---------- footer ---------- */
.footer {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--muted);
  border-top: 1px solid var(--rule);
  padding-block: 1.5rem 2.5rem;
}

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .case, .ai-grid { grid-template-columns: 1fr; }
  .case h2 { margin-bottom: 0.25rem; }
  .hero { padding-top: 5vh; }
  .gantt-label { font-size: 0.68rem; }
  /* on narrow screens put all labels above bars to avoid overflow */
  .gantt-row { margin-bottom: 1.7rem; }
  .gantt-label,
  .gantt-row:nth-child(5) .gantt-label,
  .gantt-row:nth-child(6) .gantt-label {
    left: 0; right: auto;
    top: auto; bottom: calc(100% + 3px);
    transform: none;
  }
  /* proportions preserved; labels sit above bars so overflow can't happen */
}

/* ---------- v2: nav / langs ---------- */
.topbar .brand { text-decoration: none; font-weight: 500; }
.langs { margin-left: 1.2rem; padding-left: 1.2rem; border-left: 1px solid var(--rule); }
.langs a { text-decoration: none; margin-right: 0.6rem; color: var(--muted); }
.langs a:last-child { margin-right: 0; }
.langs a.lang-active { color: var(--ink); background: var(--marker); }

/* ---------- v2: writing teaser / post list ---------- */
.writing-teaser, .postlist { padding-bottom: 5rem; }
.postlist { padding-top: 6vh; }
.teaser-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1.5rem;
  padding-block: 1rem;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
}
.teaser-row:hover .teaser-title { background: var(--marker); }
.teaser-date { color: var(--muted); padding-top: 0.2rem; }
.teaser-title { font-weight: 600; }
.teaser-block { display: flex; flex-direction: column; gap: 0.25rem; }
.teaser-desc { color: var(--muted); font-size: 0.95rem; }
.more-link { margin-top: 1.2rem; }
.more-link a { text-decoration: none; border-bottom: 2px solid var(--marker); }

/* ---------- v2: post page ---------- */
.post { padding-top: 6vh; padding-bottom: 4rem; max-width: 760px; }
.post .eyebrow a { text-decoration: none; color: var(--muted); }
.post .eyebrow a:hover { background: var(--marker); color: var(--ink); }
.post-title {
  font-family: "Archivo Black", "IBM Plex Sans", sans-serif;
  font-weight: 900;
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin-bottom: 1.2rem;
  max-width: 24ch;
}
.prose { max-width: 66ch; }
.prose p { margin-bottom: 1.1rem; }
.prose h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 2rem 0 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--ink);
}
.prose ul, .prose ol { margin: 0 0 1.1rem 1.4rem; }
.prose li { margin-bottom: 0.5rem; }
.prose a { background: linear-gradient(transparent 70%, var(--marker) 70%); text-decoration: none; }
.prose blockquote {
  border-left: 3px solid var(--marker);
  padding-left: 1rem;
  color: var(--muted);
  margin-bottom: 1.1rem;
}
.prose code {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.88em;
  background: #EDEEE8;
  padding: 0.1em 0.35em;
}
.post-foot { margin-top: 3rem; border-top: 1px solid var(--rule); padding-top: 1.5rem; }
.post-foot .aside { margin-bottom: 1.2rem; }

/* ---------- v2: subscribe ---------- */
.subscribe { margin-top: 2.5rem; }
.subscribe-form { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.subscribe-form input[type="email"] {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.9rem;
  border: 1.5px solid var(--ink);
  background: transparent;
  padding: 0.7em 1em;
  min-width: 260px;
}
.subscribe-form input[type="email"]:focus-visible { outline: 3px solid var(--marker); }

@media (max-width: 760px) {
  .teaser-row { grid-template-columns: 1fr; gap: 0.2rem; }
  .langs { display: block; margin: 0.5rem 0 0; padding-left: 0; border-left: none; }
}