@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #4ade80;
  --accent-dim: rgba(74, 222, 128, 0.15);
  --border: #30363d;
  --max-width: 800px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* --- Navigation --- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav__logo {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
  text-decoration: none;
}

.nav__links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav__links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--text-primary);
}

/* --- Layout --- */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

/* --- Hero --- */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 56px;
}

.hero__greeting {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: 16px;
}

.hero__name {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.hero__tagline {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 32px;
}

.hero__links {
  display: flex;
  gap: 16px;
}

.hero__links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.2s;
}

.hero__links a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* --- Section Headings --- */

.section-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-title::before {
  content: '# ';
  color: var(--accent);
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 40px;
}

/* --- About --- */

.about__text {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
}

.about__text strong {
  color: var(--text-primary);
}

/* --- Tech Stack --- */

.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  padding: 6px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.tech-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tech-category {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 10px;
  margin-top: 24px;
}

.tech-category:first-child {
  margin-top: 0;
}

/* --- Projects --- */

.projects-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.project-card {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all 0.2s;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
}

.project-card__title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 600;
}

.project-card__period {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', monospace;
}

.project-card__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.project-card__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.metric {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  padding: 4px 10px;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 4px;
}

/* --- Career Timeline --- */

.timeline {
  position: relative;
  padding-left: 24px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline__item {
  position: relative;
  padding-bottom: 32px;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-primary);
}

.timeline__year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 4px;
}

.timeline__title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.timeline__desc {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.timeline__projects {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

/* --- Contact --- */

.contact__links {
  display: flex;
  gap: 16px;
}

.contact__link {
  color: var(--text-secondary);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  padding: 12px 24px;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.2s;
}

.contact__link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* --- Project Detail Page --- */

.project-detail {
  padding-top: 80px;
}

.project-detail__back {
  display: inline-block;
  color: var(--text-secondary);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  margin-bottom: 32px;
  transition: color 0.2s;
}

.project-detail__back:hover {
  color: var(--accent);
}

.project-detail__title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.project-detail__meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 32px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.project-detail__content {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.9;
}

.project-detail__content h2 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 40px;
  margin-bottom: 16px;
}

.project-detail__content h2::before {
  content: '## ';
  color: var(--accent);
}

.project-detail__content p {
  margin-bottom: 16px;
}

.project-detail__content ul {
  padding-left: 20px;
  margin-bottom: 16px;
}

.project-detail__content li {
  margin-bottom: 6px;
}

.project-detail__content strong {
  color: var(--text-primary);
}

.project-detail__metrics-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

/* --- Fade-in animation --- */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Footer --- */

.footer {
  text-align: center;
  padding: 40px 0;
  color: var(--text-secondary);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}

/* --- Responsive --- */

@media (max-width: 640px) {
  .hero__name {
    font-size: 1.75rem;
  }

  .hero__tagline {
    font-size: 1rem;
  }

  section {
    padding: 60px 0;
  }

  .nav__links {
    gap: 16px;
  }

  .nav__links a {
    font-size: 0.8rem;
  }

  .project-card__header {
    flex-direction: column;
    gap: 4px;
  }

  .project-detail__title {
    font-size: 1.5rem;
  }

  .contact__links {
    flex-direction: column;
  }
}