:root {
  color-scheme: dark;
  --bg: #0d1117;
  --surface: #161b22;
  --surface-strong: #0f1620;
  --text: #c9d1d9;
  --muted: #8b949e;
  --accent: #00ff9c;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, rgba(0, 255, 156, 0.08), transparent 30%), var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.7;
}

img {
  max-width: 100%;
  display: block;
}

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

button,
input,
textarea {
  font: inherit;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 20;
  transition: background 240ms ease, border-bottom 240ms ease;
}

.topbar__inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar.scrolled {
  background: rgba(13, 17, 23, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  transition: color 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--accent);
}

/* Mobile hamburger menu */
.hamburger-menu {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  z-index: 30;
  padding: 8px;
  background: transparent;
  border: none;
}

.hamburger-menu span {
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: transform 180ms ease, opacity 180ms ease;
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 140px 24px 120px;
}

.section {
  padding: 100px 24px;
}

.section--dark {
  background: var(--surface);
}

.section-content {
  max-width: 900px;
  margin: 0 auto;
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 32px;
}

.section-label {
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.15em;
}

.section-heading h2 {
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(2rem, 2.4vw, 2.6rem);
  letter-spacing: -0.04em;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--accent);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
}

.hero h1 {
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(3.5rem, 6vw, 5.8rem);
  line-height: 0.95;
}

.cursor::after {
  content: '|';
  display: inline-block;
  margin-left: 6px;
  color: var(--accent);
  animation: blink 1.1s steps(2, start) infinite;
}

.hero-copy {
  max-width: 680px;
  margin: 28px 0 34px;
  font-size: 1.1rem;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 14px 24px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button--primary {
  background: var(--accent);
  color: #0d1117;
}

.button--ghost {
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}

.button:hover {
  transform: translateY(-2px);
}

.chips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.chip {
  display: inline-flex;
  align-items: center;
  justify-content: space-between; /* Center text when wrapped */
  padding: 12px 16px;
  border-radius: 999px;
  border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
  background: rgba(0, 255, 156, 0.06);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.project-card {
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.project-card h3 {
  margin: 0 0 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.2rem;
}

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

.tags span {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--accent);
}

.project-card p {
  margin: 0;
  color: var(--muted);
}

.project-link {
  align-self: flex-start;
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
}

.skill-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.skill-groups h3 {
  margin: 0 0 18px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.skill-groups ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.skill-groups li {
  color: var(--muted);
  font-size: 0.98rem;
}

.achievement-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 16px;
}

.achievement-list li {
  color: var(--muted);
  padding-left: 14px;
  position: relative;
}

.achievement-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.contact-section {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
}

.contact-row a {
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 14px 18px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.contact-row a:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 255, 156, 0.35);
  box-shadow: 0 18px 40px rgba(0, 255, 156, 0.12);
}

@media (max-width: 840px) {
  .project-grid,
  .skill-groups {
    grid-template-columns: 1fr;
  }

  .topbar__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
}

@media (max-width: 640px) {
  .hero {
    padding-top: 120px;
  }

  .section {
    padding: 80px 20px;
  }

  .hero-copy {
    font-size: 1rem;
  }

  .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .cursor::after {
    animation: none;
  }

  .project-card:hover,
  .button:hover,
  .contact-row a:hover {
    transform: none;
    box-shadow: none;
  }
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}