/* ==========================================================================
   Artem Kustikov — CV site theme (dark pink / light grey)
   Content comes from the Markdown pages; this file only styles it.
   ========================================================================== */

:root {
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1040px;
  --topbar-h: 64px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #08080b;
  --bg-glow-a: rgba(255, 46, 126, 0.20);
  --bg-glow-b: rgba(160, 30, 110, 0.16);
  --grid-line: rgba(255, 255, 255, 0.035);
  --surface: rgba(20, 20, 27, 0.78);
  --surface-2: rgba(28, 28, 37, 0.9);
  --topbar: rgba(8, 8, 11, 0.72);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 64, 140, 0.55);
  --text: #f5f5f7;
  --text-2: #cfcfd8;
  --muted: #8f8f9c;
  --accent: #ff2e7e;
  --accent-hover: #ff5797;
  --accent-ink: #ffffff;
  --accent-text: #ff6aa3;
  --accent-soft: rgba(255, 46, 126, 0.12);
  --chip-bg: rgba(255, 255, 255, 0.05);
  --glow: rgba(255, 46, 126, 0.38);
  --shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #e8eaee;
  --bg-glow-a: rgba(214, 16, 94, 0.10);
  --bg-glow-b: rgba(150, 60, 200, 0.07);
  --grid-line: rgba(20, 20, 40, 0.04);
  --surface: rgba(255, 255, 255, 0.86);
  --surface-2: #ffffff;
  --topbar: rgba(232, 234, 238, 0.78);
  --border: #d6d9e0;
  --border-hover: rgba(214, 16, 94, 0.5);
  --text: #15151a;
  --text-2: #33343c;
  --muted: #61636e;
  --accent: #d6105e;
  --accent-hover: #b80d50;
  --accent-ink: #ffffff;
  --accent-text: #c00d55;
  --accent-soft: rgba(214, 16, 94, 0.08);
  --chip-bg: #f1f2f5;
  --glow: rgba(214, 16, 94, 0.18);
  --shadow: 0 10px 30px rgba(20, 20, 40, 0.08);
}

/* ---------- base ---------- */

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--topbar-h) + 16px); -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-2);
  font: 400 16px/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s ease, color .25s ease;
}

.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(900px 520px at 88% -8%, var(--bg-glow-a), transparent 65%),
    radial-gradient(700px 520px at -10% 38%, var(--bg-glow-b), transparent 65%),
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0 / 48px 48px,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 48px 48px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 55%, transparent 100%);
          mask-image: linear-gradient(to bottom, #000 0%, #000 55%, transparent 100%);
}

a { color: var(--accent-text); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent-hover); text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

strong, b { color: var(--text); font-weight: 650; }
code {
  font: 500 .88em var(--mono);
  background: var(--accent-soft);
  color: var(--accent-text);
  padding: .1em .4em;
  border-radius: 6px;
}
hr { border: 0; height: 1px; background: var(--border); margin: 28px 0; }
img { max-width: 100%; height: auto; }

ul { padding-left: 1.2em; margin: .6em 0; }
li { margin: .3em 0; }
li::marker { color: var(--accent); }

h1, h2, h3, h4 { color: var(--text); line-height: 1.2; letter-spacing: -0.02em; }
h4 { font-size: .78rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin: 22px 0 8px; }

/* ---------- top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--topbar);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
          backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1240px;
  margin: 0 auto;
  height: var(--topbar-h);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; white-space: nowrap; }
.brand:hover { color: var(--text); text-decoration: none; }
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .02em;
  box-shadow: 0 0 18px var(--glow);
}
.topnav { display: flex; gap: 4px; margin: 0 auto; overflow-x: auto; scrollbar-width: none; }
.topnav::-webkit-scrollbar { display: none; }
.topnav a {
  color: var(--muted);
  font-size: .9rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 8px;
  white-space: nowrap;
  position: relative;
}
.topnav a:hover { color: var(--text); text-decoration: none; background: var(--chip-bg); }
.topnav a.active { color: var(--accent-text); }
.topnav a.active::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: -1px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--glow);
}
.topbar-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  border-radius: 10px;
  font-size: .88rem;
  font-weight: 600;
  white-space: nowrap;
  transition: background-color .15s ease, border-color .15s ease, box-shadow .2s ease, color .15s ease;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: 0 6px 22px var(--glow); }
.btn-primary:hover { background: var(--accent-hover); color: var(--accent-ink); box-shadow: 0 8px 28px var(--glow); }
.btn-ghost { border: 1px solid var(--border); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--border-hover); color: var(--text); }

.theme-toggle {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: border-color .15s ease, color .15s ease;
}
.theme-toggle:hover { border-color: var(--border-hover); color: var(--accent-text); }
:root[data-theme="dark"] .theme-toggle .icon-moon,
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }

/* ---------- page ---------- */

.page {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 24px 40px;
}

/* hero (everything before the first section) */
.hero { position: relative; margin-bottom: 64px; }
.hero h1 {
  font-size: clamp(2.4rem, 5.4vw, 3.9rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  margin: 0 0 10px;
}
.hero h1 .accent {
  color: var(--accent);
  text-shadow: 0 0 32px var(--glow);
}
.hero .hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--accent-text);
  margin: 0 0 28px;
}
.hero > p { font-size: 1.08rem; color: var(--text-2); max-width: 78ch; }
.hero > p:first-of-type { margin-top: 24px; }

/* photo + contact block written as inline-styled flex divs in the Markdown */
.hero > div[style*="flex"] {
  flex-wrap: wrap;
  align-items: center;
  gap: 20px 28px;
  padding: 22px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.hero > div[style*="flex"] > div:first-child { width: auto !important; }
.hero > div[style*="flex"] img {
  display: block;
  width: 128px;
  height: 128px;
  object-fit: cover;
  border-radius: 22px;
  box-shadow: 0 0 0 2px var(--accent), 0 0 36px var(--glow);
}
.hero > div[style*="flex"] > div:last-child { line-height: 1.9; color: var(--muted); }

/* ---------- sections ---------- */

.section { margin: 0 0 64px; }
.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 750;
  letter-spacing: -0.025em;
  margin: 0 0 22px;
}
.section-title::before {
  content: "";
  display: block;
  width: 40px;
  height: 4px;
  border-radius: 4px;
  margin-bottom: 14px;
  background: var(--accent);
  box-shadow: 0 0 16px var(--glow);
}
.section-title a { color: inherit; }
.section-title a:hover { color: var(--accent-text); text-decoration: none; }
.section-title a::after { content: " ↗"; font-size: .6em; vertical-align: .35em; color: var(--accent-text); }

.card-stack { display: grid; gap: 18px; }

.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  box-shadow: var(--shadow);
  transition: border-color .2s ease, box-shadow .25s ease, transform .2s ease;
}
.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow), 0 0 0 1px var(--border-hover), 0 0 40px -8px var(--glow);
}
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }

/* job header: "date <br> title" | "company place" */
.card > div[style*="flex"] {
  flex-wrap: wrap;
  gap: 6px 24px;
  align-items: flex-start;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.card > div[style*="flex"] > div:first-child { line-height: 1.5; }
.card > div[style*="flex"] > div:first-child::first-line {
  color: var(--accent-text);
  font-size: .8rem;
  font-weight: 650;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.card > div[style*="flex"] > div:first-child strong { display: inline-block; margin-top: 4px; font-size: 1.15rem; font-weight: 700; color: var(--text); }
.card > div[style*="flex"] > div:last-child { color: var(--muted); font-size: .95rem; padding-top: 2px; }
.card > div[style*="flex"] > div:last-child a { font-weight: 600; }

/* date headings in Full Experience */
.card > h3:first-child {
  font-size: .82rem;
  font-weight: 650;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin-bottom: 10px;
}
.card h3:not(:first-child) { font-size: 1.15rem; margin: 22px 0 8px; }

/* "Role - Project" lines */
.card p > strong:first-child ~ em { font-style: normal; color: var(--accent-text); font-weight: 500; }
.card p > strong:first-child { color: var(--text); }

/* stack chips */
.stack-line { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 4px 0 16px; }
.stack-label {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-right: 4px;
}
.chip {
  display: inline-block;
  font-size: .8rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--text-2);
  background: var(--chip-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
}

/* feature grid (Open Source projects) */
ul.feature-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
ul.feature-grid > li {
  margin: 0;
  padding: 26px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: .96rem;
  transition: border-color .2s ease, box-shadow .25s ease, transform .2s ease;
}
ul.feature-grid > li:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow), 0 0 0 1px var(--border-hover), 0 0 40px -8px var(--glow);
  transform: translateY(-2px);
}
ul.feature-grid > li > strong:first-child {
  display: block;
  font-size: 1.25rem;
  font-weight: 750;
  letter-spacing: -0.015em;
  margin-bottom: 6px;
}
ul.feature-grid > li > strong:first-child a { color: var(--text); }
ul.feature-grid > li > strong:first-child a::after { content: " ↗"; color: var(--accent-text); font-size: .8em; }
ul.feature-grid > li > strong:first-child a:hover { color: var(--accent-text); text-decoration: none; }

/* certifications in two columns */
.section-certs .card ul { columns: 2; column-gap: 32px; margin: 0; }
.section-certs .card li { break-inside: avoid; margin: 0 0 .55em; }
.section-certs .card img { margin: 6px 0 2px; max-height: 96px; }

/* ---------- footer ---------- */

.site-footer { border-top: 1px solid var(--border); }
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  color: var(--muted);
  font-size: .88rem;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--accent-text); }

/* ---------- responsive ---------- */

@media (max-width: 1100px) {
  .topnav { display: none; }
}
@media (max-width: 720px) {
  .topbar-inner { padding: 0 16px; gap: 12px; }
  .brand-name { display: none; }
  .page { padding: 36px 16px 32px; }
  .card, ul.feature-grid > li { padding: 20px; }
  .hero > div[style*="flex"] { padding: 18px; }
  ul.feature-grid { grid-template-columns: 1fr; }
  .section-certs .card ul { columns: 1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ---------- print ---------- */

@media print {
  :root, :root[data-theme] {
    --bg: #fff; --surface: #fff; --surface-2: #fff; --text: #111; --text-2: #222; --muted: #555;
    --border: #ddd; --accent: #c00d55; --accent-text: #c00d55; --chip-bg: #f4f4f4; --shadow: none; --glow: transparent;
  }
  .topbar, .site-footer, .bg-glow, .hide-in-pdf { display: none !important; }
  .page { padding: 0; max-width: none; }
  .card, ul.feature-grid > li { box-shadow: none; break-inside: avoid; }
}