:root {
  --color-bg: #fbfaf7;
  --color-surface: #fafafa;
  --color-ink: #1b1d22;
  --color-muted: #6b6b6b;
  --color-text-secondary: #4a4a4a;
  --color-border: #e5e3dc;
  --color-border-light: #d8d8d8;
  --color-accent: #3730a6;
  --color-accent-2: #0f6e56;
  --color-accent-3: #b8860b;
  --font-body: "Newsreader", serif;
  --font-mono: "JetBrains Mono", monospace;
}

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

body {
  background-color: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--color-border);
}

.logo {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-accent);
  text-decoration: none;
  font-size: 1.25rem;
}

.nav-bar ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-bar a {
  text-decoration: none;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.nav-bar a[aria-current="page"] {
  color: var(--color-accent);
}

.nav-bar a:hover {
  text-decoration: underline;
}

.hero {
  max-width: 680px;
  padding: 4rem 2rem;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.eyebrow {
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.hero-heading {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.profile-photo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-accent);
}

.main-title {
  margin-bottom: 0;
  font-size: 3rem;
  font-weight: 600;
  line-height: 1;
}

.hero .description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
}

.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  margin-right: 1rem;
  transition: background-color 0.15s ease;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-bg);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-border-light);
}

.btn-primary:hover {
  background-color: #2b2483;
}

.btn-secondary:hover {
  background-color: #f0efe9;
}

.about {
  max-width: 680px;
  padding: 2rem 2rem 4rem;
}

.about .card-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.about .description {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.open-to {
  font-style: italic;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.skills {
  max-width: 680px;
  padding: 2rem 2rem 4rem;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.skills .card-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.skills h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin: 1.5rem 0 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.skill-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-list li {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background-color: #f5f3ed;
  border-radius: 6px;
  padding: 0.4rem 0.75rem;
  font-size: 0.95rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
}

.tag-lang {
  background-color: var(--color-accent);
}

.tag-web {
  background-color: var(--color-accent-2);
}

.tag-ml {
  background-color: var(--color-accent-3);
}

.tag-data {
  background-color: #5c6470;
}

.skill-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background-color: transparent;
  border: 1px solid var(--color-border-light);
  border-radius: 20px;
  padding: 0.4rem 1rem;
  cursor: pointer;
  color: var(--color-ink);
}

.filter-btn.active {
  background-color: var(--color-ink);
  color: var(--color-bg);
  border-color: var(--color-ink);
}

footer {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.85rem;
}

.page-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  max-width: 680px;
  margin: 2rem 0 1.5rem;
}

.projects {
  max-width: 680px;
  padding: 0 2rem 4rem;
}

.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.project-card.featured {
  border: 2px solid var(--color-accent);
  background-color: #eef0fb;
}

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-bg);
  background-color: var(--color-accent);
  padding: 0.25rem 0.6rem;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.project-card .card-title {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-card .description {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.tag-row {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.tag-row li {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
}

.project-links {
  display: flex;
  gap: 1rem;
}

.project-links a {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-decoration: none;
}

.project-links a:hover {
  text-decoration: underline;
}

.interactive-demo {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.interactive-demo h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.interactive-demo textarea {
  width: 100%;
  min-height: 70px;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.75rem;
  border: 1px solid var(--color-border-light);
  border-radius: 6px;
  resize: vertical;
  margin-bottom: 0.75rem;
}

mark {
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-bg);
}

.entity-person {
  background-color: var(--color-accent);
}

.entity-org {
  background-color: var(--color-accent-2);
}

.entity-loc {
  background-color: var(--color-accent-3);
}

.entity-tech {
  background-color: #5c6470;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1rem;
}

.project-grid .project-card {
  margin-bottom: 0;
}

.project-image {
  width: 100%;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  margin-bottom: 1rem;
  display: block;
}

.stack {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.mini-project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.project-card.mini {
  margin-bottom: 0;
  padding: 1rem;
}

.mini-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.resume-section,
.education,
.contact {
  max-width: 680px;
  padding: 2rem;
}

.resume-section {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.contact {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.timeline {
  list-style: none;
  display: flex;
  position: relative;
  gap: 1rem;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 7px;
  right: 7px;
  height: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  flex: 1;
  position: relative;
  text-align: center;
  z-index: 1;
}

.timeline-item a {
  display: block;
  text-decoration: none;
  color: inherit;
  padding-top: 1.75rem;
}

.timeline-dot {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 3px solid var(--color-surface);
  transition: transform 0.15s ease;
}

.timeline-item a:hover .timeline-dot {
  transform: translateX(-50%) scale(1.2);
}

.timeline-item a:hover .card-title {
  color: var(--color-accent);
}

.timeline-item .card-title {
  font-size: 1.05rem;
  transition: color 0.15s ease;
}

.timeline-item .description {
  font-size: 0.85rem;
}
.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.description {
  color: var(--color-text-secondary);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

@media (max-width: 640px) {
  header {
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
  }

  .nav-bar ul {
    gap: 1rem;
  }

  .main-title {
    font-size: 2rem;
  }

  .hero,
  .about,
  .skills,
  .projects,
  .page-title,
  .resume-section,
  .education,
  .contact {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  .btn-primary,
  .btn-secondary {
    display: block;
    text-align: center;
    margin-right: 0;
    margin-bottom: 0.75rem;
  }

  .project-grid,
  .mini-project-grid {
    grid-template-columns: 1fr;
  }

  .interactive-demo {
    padding: 1rem;
  }

  .interactive-demo textarea {
    font-size: 16px;
  }
}