/* Portfolio — Asankhan Nurtilek
 * Theme: terminal-leaning engineering portfolio.
 * One accent: terminal green. Light + dark, RU + EN.
 */

:root {
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --sans: "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif;

  /* dark (default) */
  --bg: #0a0a0a;
  --bg-elev: #111111;
  --bg-soft: #161616;
  --line: #232323;
  --line-strong: #2e2e2e;
  --fg: #ededeb;
  --fg-dim: #9a9a96;
  --fg-mute: #5b5b58;
  --accent: oklch(0.82 0.16 145);
  --accent-soft: oklch(0.82 0.16 145 / 0.14);
  --warn: oklch(0.78 0.14 60);
  --shadow: 0 1px 0 rgba(255,255,255,0.04) inset;
}

[data-theme="light"] {
  --bg: #fafaf7;
  --bg-elev: #ffffff;
  --bg-soft: #f1f0eb;
  --line: #e4e2dc;
  --line-strong: #cfccc4;
  --fg: #15140f;
  --fg-dim: #5e5b54;
  --fg-mute: #8b887f;
  --accent: oklch(0.55 0.16 145);
  --accent-soft: oklch(0.55 0.16 145 / 0.10);
  --warn: oklch(0.55 0.14 60);
  --shadow: 0 1px 0 rgba(0,0,0,0.02) inset;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  letter-spacing: -0.005em;
  transition: background 200ms ease, color 200ms ease;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

/* ──────────────────────────────────────────────────────────
   layout grid
   ────────────────────────────────────────────────────────── */
.shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

@media (max-width: 720px) {
  .shell { padding: 0 20px; }
}

/* ──────────────────────────────────────────────────────────
   nav
   ────────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: color-mix(in oklab, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 13px;
}
.monogram {
  width: 30px; height: 30px;
  border: 1px solid var(--line-strong);
  display: grid; place-items: center;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.02em;
  background: var(--bg-elev);
  position: relative;
}
.monogram::after {
  content: "";
  position: absolute;
  inset: -3px;
  border: 1px solid var(--accent);
  opacity: 0;
  transition: opacity 200ms;
}
.brand:hover .monogram::after { opacity: 0.5; }
.brand-name { color: var(--fg); }
.brand-role { color: var(--fg-mute); margin-left: 6px; }

.nav-links {
  display: flex;
  gap: 22px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-dim);
}
.nav-links a {
  position: relative;
  padding: 4px 0;
  transition: color 160ms;
}
.nav-links a:hover { color: var(--fg); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transition: right 200ms ease;
}
.nav-links a:hover::after { right: 0; }
@media (max-width: 720px) {
  .nav-links { display: none; }
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
}
.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 10px;
  border: 1px solid var(--line-strong);
  color: var(--fg-dim);
  background: var(--bg-elev);
  transition: color 160ms, border-color 160ms, background 160ms;
}
.tool-btn:hover { color: var(--fg); border-color: var(--accent); }
.tool-btn .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* ──────────────────────────────────────────────────────────
   section frame
   ────────────────────────────────────────────────────────── */
.section {
  padding: 120px 0 40px;
  position: relative;
}
@media (max-width: 720px) {
  .section { padding: 72px 0 28px; }
}

.section-head {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  margin-bottom: 48px;
}
@media (max-width: 820px) {
  .section-head { grid-template-columns: 1fr; gap: 12px; }
}
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--fg-mute);
  display: flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 8px; height: 8px;
  background: var(--accent);
  display: inline-block;
}
.section-title {
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 720px;
  text-wrap: pretty;
}

/* ──────────────────────────────────────────────────────────
   hero
   ────────────────────────────────────────────────────────── */
.hero {
  padding: 96px 0 100px;
  position: relative;
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 48px;
  align-items: stretch;
}
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
}
.hero-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-dim);
  margin-bottom: 24px;
}
.hero-meta .pulse {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  position: relative;
}
.hero-meta .pulse::after {
  content: "";
  position: absolute; inset: -3px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  animation: pulse 1.6s ease-out infinite;
}
@keyframes pulse {
  0% { transform: scale(0.8); opacity: 0.8; }
  100% { transform: scale(2); opacity: 0; }
}

.hero h1 {
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(40px, 5.6vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin: 0 0 18px;
}
.hero h1 .accent {
  color: var(--fg);
  position: relative;
  white-space: nowrap;
}
.hero h1 .accent::after {
  content: "_";
  color: var(--accent);
  font-family: var(--mono);
  margin-left: 4px;
  animation: blink 1.05s steps(1) infinite;
  font-weight: 400;
}
@keyframes blink {
  50% { opacity: 0; }
}

.hero-tagline {
  white-space: pre-line;
  font-size: 18px;
  color: var(--fg-dim);
  max-width: 520px;
  margin: 0 0 32px;
  line-height: 1.5;
}
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  margin-bottom: 36px;
}
.hero-stats span { display: inline-flex; align-items: center; gap: 8px; }
.hero-stats .sep { width: 1px; height: 12px; background: var(--line-strong); display: inline-block; }

.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 44px;
  padding: 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  border: 1px solid var(--line-strong);
  transition: all 180ms ease;
  background: var(--bg-elev);
}
.btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  color: #0a0a0a;
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--fg); border-color: var(--fg); color: var(--bg); }
.btn .arrow { transition: transform 180ms; }
.btn:hover .arrow { transform: translateX(3px); }

/* terminal */
.terminal {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  display: flex;
  flex-direction: column;
  min-height: 360px;
  box-shadow: var(--shadow);
}
.term-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  font-size: 11px;
  color: var(--fg-mute);
}
.term-bar .pip {
  width: 10px; height: 10px; border-radius: 50%;
  border: 1px solid var(--line-strong);
}
.term-bar .pip.r { background: #ff5f57; border-color: #ff5f57; }
.term-bar .pip.y { background: #febc2e; border-color: #febc2e; }
.term-bar .pip.g { background: #28c840; border-color: #28c840; }
.term-title { margin-left: 6px; }
.term-body {
  padding: 16px 18px;
  flex: 1;
  overflow-y: auto;
  max-height: 360px;
}
.term-line { white-space: pre-wrap; word-break: break-word; }
.term-line.cmd { color: var(--fg); }
.term-line.cmd::before {
  content: "❯ ";
  color: var(--accent);
}
.term-line.out { color: var(--fg-dim); }
.term-line.out.dim { color: var(--fg-mute); }
.term-line.out.acc { color: var(--accent); }
.term-input-line {
  display: flex;
  align-items: center;
  padding: 10px 18px 16px;
  gap: 8px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
}
.term-input-line .prompt { color: var(--accent); }
.term-input {
  flex: 1;
  background: transparent;
  border: 0;
  outline: 0;
  font: inherit;
  color: var(--fg);
  caret-color: var(--accent);
}
.term-hint {
  padding: 0 18px 14px;
  font-size: 11px;
  color: var(--fg-mute);
}
.term-cursor {
  display: inline-block;
  width: 8px;
  height: 14px;
  background: var(--accent);
  vertical-align: -2px;
  margin-left: 2px;
  animation: blink 1.05s steps(1) infinite;
}

/* ──────────────────────────────────────────────────────────
   about
   ────────────────────────────────────────────────────────── */
.about-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
@media (max-width: 820px) {
  .about-body { grid-template-columns: 1fr; gap: 32px; }
}
.about-text {
  font-size: 18px;
  color: var(--fg-dim);
  line-height: 1.55;
  max-width: 540px;
  text-wrap: pretty;
}
.highlights {
  border-top: 1px solid var(--line);
}
.hl-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.hl-row .k {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: -0.005em;
}
.hl-row .v {
  font-size: 14px;
  color: var(--fg-dim);
  line-height: 1.45;
}
.langs {
  margin-top: 28px;
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
}
.langs span b { color: var(--fg); font-weight: 500; }

/* ──────────────────────────────────────────────────────────
   experience timeline
   ────────────────────────────────────────────────────────── */
.timeline { position: relative; }
.exp-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  position: relative;
  transition: background 200ms;
}
.exp-row:last-child { border-bottom: 1px solid var(--line); }
.exp-row:hover { background: color-mix(in oklab, var(--bg-elev) 50%, transparent); }
.exp-meta {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  line-height: 1.5;
}
.exp-period { color: var(--fg-dim); }
.exp-duration { display: block; margin-top: 4px; }
.exp-sector {
  display: inline-block;
  margin-top: 10px;
  padding: 2px 8px;
  border: 1px solid var(--line-strong);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
}
.exp-main { display: flex; flex-direction: column; gap: 10px; }
.exp-role {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--fg);
}
.exp-company {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
}
.exp-bullets {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.exp-bullets li {
  position: relative;
  padding-left: 18px;
  color: var(--fg-dim);
  font-size: 14.5px;
  line-height: 1.55;
}
.exp-bullets li::before {
  content: "—";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--fg-mute);
  font-family: var(--mono);
}
@media (max-width: 720px) {
  .exp-row { grid-template-columns: 1fr; gap: 16px; }
}

/* ──────────────────────────────────────────────────────────
   projects
   ────────────────────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (max-width: 820px) { .projects-grid { grid-template-columns: 1fr; } }
.project {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: relative;
  transition: border-color 200ms, transform 200ms;
}
.project:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}
.project::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-top: 1px solid transparent;
  transition: border-color 200ms;
}
.project:hover::before { border-top-color: var(--accent); }
.project.featured {
  grid-column: 1 / -1;
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-soft));
}
.project-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--accent);
  align-self: flex-start;
  padding: 3px 8px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
}
.project-name {
  font-size: 24px;
  font-weight: 500;
  letter-spacing: -0.018em;
  margin: 0;
}
.project-where {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  margin-top: -10px;
}
.project-desc {
  color: var(--fg-dim);
  font-size: 15px;
  line-height: 1.5;
  margin: 0;
  text-wrap: pretty;
}
.project-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.metric .v {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--fg);
  display: block;
}
.metric .l {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-mute);
  display: block;
  margin-top: 4px;
  letter-spacing: 0.02em;
}
.project.featured .metric .v { color: var(--accent); }
.project-stack {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-mute);
}
.project-stack span {
  padding: 3px 8px;
  border: 1px solid var(--line);
}

/* ──────────────────────────────────────────────────────────
   architecture graph
   ────────────────────────────────────────────────────────── */
.arch-wrap {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  padding: 32px;
}
.arch-svg {
  width: 100%;
  height: auto;
  display: block;
}
.arch-svg .node-rect {
  fill: var(--bg-soft);
  stroke: var(--line-strong);
  stroke-width: 1;
}
.arch-svg .node-rect.gw { stroke: var(--accent); }
.arch-svg .node-text {
  font-family: var(--mono);
  font-size: 11px;
  fill: var(--fg);
  dominant-baseline: middle;
  text-anchor: middle;
}
.arch-svg .node-text.dim { fill: var(--fg-mute); font-size: 9px; }
.arch-svg .edge {
  stroke: var(--line-strong);
  stroke-width: 1;
  fill: none;
}
.arch-svg .pulse-dot {
  fill: var(--accent);
}
.arch-caption {
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  max-width: 720px;
  line-height: 1.55;
}

/* ──────────────────────────────────────────────────────────
   stack + edu
   ────────────────────────────────────────────────────────── */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
@media (max-width: 820px) { .stack-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .stack-grid { grid-template-columns: 1fr; } }
.stack-cell {
  padding: 24px 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-height: 160px;
}
.stack-name {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}
.stack-name::before { content: "// "; color: var(--accent); }
.stack-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--fg);
  font-family: var(--mono);
}

.edu {
  margin-top: 64px;
}
.edu-row {
  display: grid;
  grid-template-columns: 80px 1fr 1fr;
  gap: 24px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
  align-items: baseline;
}
.edu-row:last-child { border-bottom: 1px solid var(--line); }
.edu-y {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
}
.edu-d { color: var(--fg); }
.edu-w { color: var(--fg-mute); font-family: var(--mono); font-size: 12px; }
@media (max-width: 720px) {
  .edu-row { grid-template-columns: 60px 1fr; gap: 12px; }
  .edu-w { grid-column: 2; }
}

/* ──────────────────────────────────────────────────────────
   contact + footer
   ────────────────────────────────────────────────────────── */
.contact-card {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  padding: 56px 48px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}
@media (max-width: 820px) {
  .contact-card { grid-template-columns: 1fr; padding: 36px 28px; gap: 28px; }
}
.contact-title {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 14px;
}
.contact-body {
  color: var(--fg-dim);
  margin: 0 0 24px;
  font-size: 16px;
}
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}
.c-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 13px;
  transition: padding 180ms;
}
.c-link:hover { padding-left: 14px; }
.c-link .label { color: var(--fg-mute); font-size: 11px; letter-spacing: 0.06em; }
.c-link .val { color: var(--fg); display: flex; align-items: center; gap: 10px; }
.c-link:hover .val { color: var(--accent); }

footer.foot {
  margin-top: 80px;
  padding: 24px 0 40px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-mute);
  flex-wrap: wrap;
  gap: 12px;
}

/* fade-in */
.fade-in {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 600ms ease, transform 600ms ease;
}
.fade-in.in {
  opacity: 1;
  transform: none;
}

/* selection */
::selection { background: var(--accent); color: #0a0a0a; }

/* scrollbar */
.term-body::-webkit-scrollbar { width: 8px; }
.term-body::-webkit-scrollbar-thumb { background: var(--line-strong); }
.term-body::-webkit-scrollbar-track { background: transparent; }