:root {
  color-scheme: dark;
  --bg: #07080c;
  --bg-elevated: rgba(18, 20, 28, 0.78);
  --bg-elevated-strong: rgba(24, 26, 36, 0.95);
  --text: #edf1f7;
  --muted: #a8b0bf;
  --border: rgba(255, 255, 255, 0.1);
  --accent: #87d5ff;
  --accent-strong: #d6f1ff;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.38);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f8fb;
  --bg-elevated: rgba(255, 255, 255, 0.82);
  --bg-elevated-strong: rgba(255, 255, 255, 0.96);
  --text: #0d1321;
  --muted: #516074;
  --border: rgba(13, 19, 33, 0.1);
  --accent: #0369a1;
  --accent-strong: #08344f;
  --shadow: 0 18px 60px rgba(13, 19, 33, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(135, 213, 255, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(140, 110, 255, 0.14), transparent 24%),
    var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

main {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 36px 0 60px;
}

.site-header {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 24px 0 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 2;
}

.brand {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-elevated);
  backdrop-filter: blur(18px);
  font-family: "IBM Plex Mono", monospace;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 14px;
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.theme-toggle-track {
  width: 44px;
  height: 24px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid var(--border);
  position: relative;
}

.theme-toggle-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(180deg, var(--accent-strong), var(--accent));
  position: absolute;
  top: 50%;
  left: 3px;
  transform: translateY(-50%);
  transition: transform 220ms ease;
}

:root[data-theme="light"] .theme-toggle-thumb {
  transform: translate(20px, -50%);
}

.theme-toggle-label {
  font-size: 0.9rem;
  font-weight: 600;
}

.section {
  margin-top: 34px;
  padding: 30px 0;
  position: relative;
}

.hero {
  margin-top: 0;
  padding-top: 0;
  padding-bottom: 0;
  min-height: calc(100svh - 136px);
  display: grid;
  align-content: center;
  transform: translateY(-32px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--muted);
  background: var(--bg-elevated);
  backdrop-filter: blur(18px);
  font-size: 0.82rem;
  font-family: "IBM Plex Mono", monospace;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  margin-top: 14px;
  font-size: clamp(3rem, 7vw, 5.9rem);
  line-height: 0.96;
  letter-spacing: -0.06em;
  max-width: 10.5ch;
}

.hero-copy {
  margin-top: 18px;
  max-width: 74ch;
  font-size: clamp(1.02rem, 1.4vw, 1.18rem);
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 20px;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid var(--border);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button:hover,
.theme-toggle:hover,
.card:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: white;
  border-color: transparent;
}

.button-secondary {
  background: var(--bg-elevated);
  color: var(--text);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 42px;
}

.hero-metrics article,
.card {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.hero-metrics article {
  border-radius: 22px;
  padding: 18px 20px;
}

.hero-metrics strong {
  display: block;
  font-size: 2rem;
  letter-spacing: -0.04em;
}

.hero-metrics span {
  color: var(--muted);
}

.section-heading {
  display: grid;
  gap: 8px;
  margin-bottom: 22px;
}

.section-heading span,
.project-meta {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.timeline-card .card-topline,
.card-summary-meta,
.card-toggle,
.card-date,
.timeline-card h3,
.project-card h3,
.project-meta {
  font-family: "IBM Plex Mono", monospace;
}

.section-heading h2,
.contact-card h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  letter-spacing: -0.04em;
  max-width: 14ch;
}

.timeline,
.project-grid {
  display: grid;
  gap: 16px;
}

.timeline-card,
.project-card,
.contact-card {
  border-radius: 26px;
  padding: 20px 22px;
}

.timeline-card,
.project-card {
  display: block;
}

.card-summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: start;
  cursor: pointer;
  list-style: none;
}

.card-summary::-webkit-details-marker {
  display: none;
}

.card-toggle {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
}

.timeline-card[open] .card-toggle,
.project-card[open] .card-toggle {
  color: var(--text);
}

.card-summary-main {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.card-summary-meta {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  color: var(--muted);
  padding-top: 2px;
}

.card-date {
  font-size: 0.82rem;
  font-weight: 500;
}

.meta-dot {
  opacity: 0.75;
}

.company-mark {
  width: 46px;
  height: 46px;
  border-radius: 0;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}

.company-mark span {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.company-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  padding: 7px;
  display: block;
}

.arity-mark img,
.ua-mark img {
  width: 100%;
  height: 100%;
  padding: 2px;
  transform-origin: center;
}

.ua-mark img {
  padding: 0;
  border-radius: 0;
  transform: scale(1.22);
}

.arity-mark img {
  transform: scale(1.08);
}

.arity-mark {
  background: linear-gradient(135deg, rgba(135, 213, 255, 0.2), rgba(135, 213, 255, 0.05));
}

.regions-mark {
  background: linear-gradient(135deg, rgba(78, 163, 116, 0.2), rgba(78, 163, 116, 0.05));
}

.ua-mark {
  background: linear-gradient(135deg, rgba(159, 29, 46, 0.18), rgba(159, 29, 46, 0.05));
}

.card-details {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.card-details ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 12px;
  color: var(--muted);
}

.entry-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.project-card .entry-tags {
  justify-content: flex-start;
}

.entry-tags span {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
}

.project-title-link {
  display: inline-block;
}

.project-title-link:hover,
.project-title-link:focus-visible {
  color: var(--accent);
}

.card-topline {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
}

.timeline-card h3,
.project-card h3 {
  margin-bottom: 10px;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.timeline-card p,
.project-card p {
  color: var(--muted);
}

.project-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: start;
}

.project-card {
  min-height: auto;
}

.project-meta {
  margin-bottom: 18px;
}

.education-card {
  width: 100%;
  display: block;
  border-radius: 26px;
  padding: 20px 22px;
}

.education-card p {
  margin: 0;
}

.education-main {
  align-items: center;
  gap: 16px;
}

.education-copy {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.education-topline {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
}

.edu-school {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.edu-date {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--muted);
  white-space: nowrap;
}

.education-degree {
  color: var(--muted);
}

.education-gpa {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--muted);
}

.education-coursework {
  margin-top: 6px;
  font-size: 0.92rem;
  color: var(--muted);
}

.card {
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.contact-strip {
  width: fit-content;
  margin: 34px auto 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.contact-icon {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  transition: transform 180ms ease, color 180ms ease, background 180ms ease;
}

.contact-icon svg {
  width: 20px;
  height: 20px;
}

.contact-icon img {
  width: 20px;
  height: 20px;
  display: block;
  filter: brightness(0) invert(1);
}

.contact-icon span {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.contact-icon:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
}

.ambient {
  position: fixed;
  inset: auto;
  border-radius: 999px;
  filter: blur(12px);
  pointer-events: none;
  z-index: 0;
}

.ambient-one {
  width: 32vw;
  height: 32vw;
  top: -9vw;
  right: -10vw;
  background: radial-gradient(circle, rgba(135, 213, 255, 0.22), transparent 65%);
}

.ambient-two {
  width: 26vw;
  height: 26vw;
  bottom: -8vw;
  left: -8vw;
  background: radial-gradient(circle, rgba(122, 92, 255, 0.15), transparent 62%);
}

@media (max-width: 900px) {
  .hero-metrics,
  .project-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .contact-strip {
    width: calc(100% - 24px);
    justify-content: space-between;
  }

  .contact-icon {
    padding: 10px 10px;
    gap: 8px;
  }

  .contact-icon span {
    font-size: 0.72rem;
  }

  .company-mark {
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 720px) {
  main,
  .site-header {
    width: min(100% - 24px, 1120px);
  }

  .site-header {
    padding-top: 16px;
  }

  .hero {
    min-height: auto;
    padding-top: 42px;
  }

  h1 {
    max-width: 12ch;
  }

  .card-topline {
    flex-direction: column;
    align-items: flex-start;
  }

  .card-summary {
    grid-template-columns: 1fr;
  }

  .card-summary-main {
    grid-template-columns: 1fr;
  }

  .card-summary-meta {
    justify-content: flex-start;
    align-items: center;
    flex-wrap: wrap;
    padding-top: 0;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }
}