:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2332;
  --bg-terminal: #0d1117;
  --accent: #00ff41;
  --accent-dim: rgba(0, 255, 65, 0.15);
  --accent-glow: 0 0 20px rgba(0, 255, 65, 0.3);
  --text: #e6edf3;
  --text-dim: #8b949e;
  --border: #1e2d3d;
  --red: #ff3b30;
  --yellow: #ffd60a;
  --green: #30d158;
  --orange: #ff9f0a;
  --blue: #0a84ff;
  --font-main: 'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', monospace;
  --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s;
}

a:hover {
  color: #fff;
}

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

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-dim);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* Particles Canvas */
#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* Navigation */
#navbar {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s;
}

#navbar.scrolled {
  background: rgba(10, 14, 23, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.5px;
}

.logo:hover {
  color: var(--accent);
  text-shadow: var(--accent-glow);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: var(--text-dim);
  font-size: 0.9rem;
  position: relative;
  padding: 0.25rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s;
}

.nav-link:hover {
  color: var(--text);
}

.nav-link:hover::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.hamburger span {
  width: 25px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  padding: 2rem;
}

.hero-content {
  max-width: 750px;
  width: 100%;
  text-align: center;
}

.terminal {
  background: var(--bg-terminal);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
  text-align: left;
}

.terminal-bar {
  background: var(--bg-secondary);
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.term-title {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red { background: var(--red); }
.dot.yellow { background: var(--yellow); }
.dot.green { background: var(--green); }

.terminal-body {
  padding: 1.5rem 2rem;
  font-size: 0.95rem;
  line-height: 2;
}

.terminal-body p {
  margin-bottom: 0.35rem;
}

.prompt {
  color: var(--green);
  font-weight: 700;
}

.cmd {
  color: var(--blue);
}

.output {
  color: var(--text-dim);
  padding-left: 1.2rem;
}

.highlight {
  color: var(--accent);
  text-shadow: 0 0 8px rgba(0, 255, 65, 0.4);
}

.blink {
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-cta {
  margin-top: 2.5rem;
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--font-main);
  padding: 0.75rem 2rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
}

.primary-btn {
  background: var(--accent);
  color: var(--bg-primary) !important;
  box-shadow: 0 0 20px rgba(0, 255, 65, 0.2);
}

.primary-btn:hover {
  box-shadow: 0 0 35px rgba(0, 255, 65, 0.4);
  transform: translateY(-2px);
  color: var(--bg-primary) !important;
}

.outline-btn {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent) !important;
}

.outline-btn:hover {
  background: var(--accent-dim);
  transform: translateY(-2px);
  color: var(--accent) !important;
}

/* Sections */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 6rem 0;
  position: relative;
  z-index: 1;
}

.section-title {
  font-size: 1.75rem;
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--accent);
  box-shadow: var(--accent-glow);
}

.hash {
  color: var(--accent-dim);
  font-weight: 300;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  color: var(--text-dim);
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.about-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-suffix {
  font-size: 1.25rem;
  color: var(--accent);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1rem;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1rem;
  text-align: center;
  transition: all 0.3s;
  cursor: default;
}

.skill-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 15px rgba(0, 255, 65, 0.1);
  transform: translateY(-3px);
}

.skill-card i {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.skill-card span {
  display: block;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Projects */
.projects-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.filter-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 0.5rem 1.25rem;
  border-radius: 6px;
  font-family: var(--font-main);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.3s;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.filter-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.small-btn {
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-dim) !important;
  border-radius: 6px;
}

.small-btn:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.3s;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.project-card:hover::before {
  opacity: 1;
}

.project-card.hidden {
  display: none;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.project-header i {
  font-size: 1.5rem;
  color: var(--accent);
}

.project-header .repo-stars i {
  font-size: 0.85rem;
}

.repo-stars {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.project-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.project-name a {
  color: var(--text);
}

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

.project-desc {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.project-tag {
  background: var(--accent-dim);
  color: var(--accent);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.7rem;
}

.project-lang {
  font-size: 0.8rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.lang-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

/* Research */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.research-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.3s;
}

.research-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.research-category {
  display: inline-block;
  background: var(--accent-dim);
  color: var(--accent);
  padding: 0.2rem 0.7rem;
  border-radius: 4px;
  font-size: 0.7rem;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.research-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.research-card h3 a {
  color: var(--text);
}

.research-card h3 a:hover {
  color: var(--accent);
}

.research-card p {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.research-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.read-more {
  color: var(--accent);
  font-size: 0.8rem;
}

.read-more i {
  font-size: 0.7rem;
  transition: transform 0.3s;
}

.read-more:hover i {
  transform: translateX(3px);
}

/* Contact */
#contact {
  text-align: center;
}

#contact .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}

.contact-content > p {
  color: var(--text-dim);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  max-width: 800px;
  margin: 0 auto 2.5rem;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-dim);
  transition: all 0.3s;
}

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

.contact-card i {
  font-size: 1.25rem;
  width: 1.5rem;
  text-align: center;
}

.contact-card span {
  font-size: 0.85rem;
}

.pgp-key {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.5rem;
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.pgp-label {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.pgp-fingerprint {
  font-size: 0.8rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

footer p {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.heart {
  color: var(--red);
}

/* Responsive */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-stats {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    height: 100vh;
    background: rgba(10, 14, 23, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: right 0.3s;
    border-left: 1px solid var(--border);
  }

  .nav-links.active {
    right: 0;
  }

  .hamburger {
    display: flex;
  }

  .projects-grid,
  .research-grid {
    grid-template-columns: 1fr;
  }

  .terminal-body {
    padding: 1rem;
    font-size: 0.85rem;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .about-stats {
    flex-direction: column;
    gap: 1rem;
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-links {
    grid-template-columns: 1fr;
  }
}