/* ============================================================
   Dark & techy theme — edit the variables below to re-skin
   ============================================================ */
:root {
  --bg: #0d1117;
  --bg-raised: #161b22;
  --bg-card: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #ff9838;        /* orange — try #58a6ff (blue) or #2dd4bf (teal) */
  --accent-dim: rgba(255, 152, 56, 0.12);
  --font-body: "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "Cascadia Code", "Consolas", "Fira Code", monospace;
  --radius: 10px;
  --container: 1080px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  /* subtle grid backdrop for the techy feel */
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 40px 40px;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.accent { color: var(--accent); }

/* ============ Header / nav ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-family: var(--font-mono);
  transition: color 0.2s;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: transform 0.2s, opacity 0.2s;
}

/* ============ Hero ============ */
.hero {
  padding: 7rem 1.5rem 5rem;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 3.2rem);
  line-height: 1.2;
  margin-bottom: 1.25rem;
  max-width: 22ch;
}

.hero-sub {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 55ch;
  margin-bottom: 2rem;
}

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ============ Buttons ============ */
.btn {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

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

.btn-primary {
  background: var(--accent);
  color: #2b1600;
  font-weight: 600;
}

.btn-primary:hover { box-shadow: 0 6px 20px rgba(255, 152, 56, 0.35); }

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

.btn-ghost:hover { background: var(--accent-dim); }

.btn-lg { padding: 0.9rem 2.2rem; font-size: 1.05rem; }

/* ============ Sections ============ */
.section { padding: 4.5rem 1.5rem; }

.section h2 {
  font-size: 1.7rem;
  margin-bottom: 0.75rem;
}

/* Simple terminal-prompt marker before section headings */
.prompt {
  font-family: var(--font-mono);
  color: var(--accent);
  margin-right: 0.35rem;
}

.section-sub {
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 60ch;
}

/* ============ About ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 2.5rem;
  margin-top: 1.5rem;
}

.about-text p { color: var(--text-muted); margin-bottom: 1rem; }

.about-facts {
  list-style: none;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  align-self: start;
}

.about-facts li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

.about-facts li:last-child { border-bottom: none; }

.fact-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============ Project filter ============ */
.filter-bar {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.filter-btn {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  padding: 0.45rem 1.1rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
}

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

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #2b1600;
  font-weight: 600;
}

/* ============ Project & interest cards ============ */
.project-grid,
.interest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 1.4rem;
}

.project-card,
.interest-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  transition: transform 0.2s, border-color 0.2s;
  display: flex;
  flex-direction: column;
}

.project-card:hover,
.interest-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

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

.card-icon { font-size: 1.9rem; margin-bottom: 0.9rem; }

.project-card h3,
.interest-card h3 { margin-bottom: 0.5rem; font-size: 1.15rem; }

.project-card p,
.interest-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  flex-grow: 1;
}

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1rem 0 0.75rem;
}

.tag-list li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}

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

.card-link:hover { text-decoration: underline; }

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

.contact .section-sub { margin-left: auto; margin-right: auto; }

.social-links {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 1.75rem;
}

.social-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  transition: color 0.2s;
}

.social-links a:hover { color: var(--accent); }

/* ============ Footer ============ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-family: var(--font-mono);
}

/* ============ Reveal-on-scroll ============ */
.section {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .section { opacity: 1; transform: none; transition: none; }
  .btn:hover, .project-card:hover, .interest-card:hover { transform: none; }
}

/* ============ Mobile ============ */
@media (max-width: 720px) {
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-raised);
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open { display: flex; }

  .nav-links a {
    display: block;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
  }

  .hero { padding-top: 4.5rem; }

  .about-grid { grid-template-columns: 1fr; }
}