body { font-family: 'Inter', sans-serif; }
:root {
  --bg:          #0D1117;
  --surface:     #161B22;
  --surface-2:   #1C2333;
  --border:      #30363D;
  --cyan:        #00B4D8;
  --cyan-dim:    rgba(0, 180, 216, 0.12);
  --violet:      #7C3AED;
  --violet-dim:  rgba(124, 58, 237, 0.12);
  --green:       #3FB950;
  --text:        #E6EDF3;
  --text-muted:  #8B949E;
  --text-faint:  #484F58;
  --radius-sm:   6px;
  --radius:      12px;
  --radius-lg:   20px;
  --font-display:'Space Grotesk', sans-serif;
  --font-body:   'Inter', sans-serif;
  --font-mono:   'JetBrains Mono', monospace;
  --transition:  0.25s ease;
}
/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  height: 64px;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
.nav-logo span { color: var(--cyan); }

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }

.nav-cta {
  padding: 8px 20px;
  background: var(--cyan-dim);
  border: 1px solid var(--cyan);
  border-radius: var(--radius-sm);
  color: var(--cyan) !important;
  font-size: 0.85rem !important;
  font-weight: 600 !important;
  transition: background var(--transition) !important;
}
.nav-cta:hover { background: rgba(0,180,216,0.22) !important; }

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}
@media (max-width: 700px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 5%;
    gap: 1.2rem;
  }
  .projects-grid { grid-template-columns: 1fr; }
  footer { flex-direction: column; gap: 0.75rem; text-align: center; }
}
.font-mono { font-family: 'JetBrains Mono', monospace; }

.preview-image{
    height: 200px;
    width: 100%;
    object-fit: cover;
    cursor: zoom-in;
    transition: transform 0.2s ease;
}
.preview-image:hover{
    transform: scale(1.02);
}

/* ── Lightbox ── */
#lightbox-overlay{
    position: fixed;
    inset: 0;
    z-index: 999;
    background: rgba(0,0,0,0.9);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    cursor: zoom-out;
}
#lightbox-overlay.active{
    display: flex;
}
#lightbox-img{
    max-width: 90vw;
    max-height: 85vh;
    object-fit: contain;
    border-radius: 0.5rem;
    box-shadow: 0 20px 60px rgba(0,0,0,0.6);
    cursor: default;
    user-select: none;
}
#lightbox-close{
    position: fixed;
    top: 1.25rem;
    right: 1.5rem;
    color: #fff;
    font-size: 1.75rem;
    line-height: 1;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 9999px;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
#lightbox-close:hover{
    background: rgba(255,255,255,0.2);
}
.lightbox-nav{
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    color: #fff;
    font-size: 2rem;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 9999px;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    user-select: none;
}
.lightbox-nav:hover{
    background: rgba(255,255,255,0.2);
}
#lightbox-prev{ left: 1.5rem; }
#lightbox-next{ right: 1.5rem; }
#lightbox-counter{
    position: fixed;
    bottom: 1.25rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.7);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
}