/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:          #09090f;
  --bg-card:     #0f0f1a;
  --bg-card-hover: #131325;
  --border:      rgba(255, 255, 255, 0.07);
  --border-hover: rgba(139, 92, 246, 0.35);
  --text-primary: #f0f0f8;
  --text-secondary: #9191a8;
  --text-muted:  #5c5c78;
  --accent:      #8b5cf6;
  --accent-2:    #6366f1;
  --accent-glow: rgba(139, 92, 246, 0.18);

  /* language badge colours */
  --ts:   #3178c6;
  --js:   #f0db4f;
  --py:   #3572a5;
  --sh:   #4eaa25;
  --cfg:  #a0522d;
  --nb:   #da5b0b;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --shadow-card: 0 2px 24px rgba(0,0,0,0.45);
  --shadow-glow: 0 0 60px rgba(139, 92, 246, 0.25);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  background: rgba(9, 9, 15, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}

.nav.scrolled {
  border-bottom-color: var(--border);
}

.nav-inner {
  max-width: 1120px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-logo::before {
  content: '~/';
  color: var(--accent);
}

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

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8rem 2rem 6rem;
  overflow: hidden;
}

/* Background orbs */
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
}

.orb-1 {
  width: 600px;
  height: 600px;
  top: -200px;
  left: -200px;
  background: radial-gradient(circle, #4f35a3 0%, transparent 70%);
  animation: drift 18s ease-in-out infinite alternate;
}

.orb-2 {
  width: 500px;
  height: 500px;
  top: 30%;
  right: -150px;
  background: radial-gradient(circle, #2d1b69 0%, transparent 70%);
  animation: drift 22s ease-in-out infinite alternate-reverse;
}

.orb-3 {
  width: 400px;
  height: 400px;
  bottom: -100px;
  left: 40%;
  background: radial-gradient(circle, #1e1060 0%, transparent 70%);
  animation: drift 16s ease-in-out infinite alternate;
}

@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(40px, 30px) scale(1.05); }
}

/* Hero content */
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  text-align: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #a78bfa;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-radius: 100px;
  padding: 5px 14px;
  margin-bottom: 1.5rem;
}

.hero-tag::before {
  content: '';
  width: 7px;
  height: 7px;
  background: #a78bfa;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.75); }
}

.hero-title {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.gradient-text {
  background: linear-gradient(135deg, #a78bfa 0%, #818cf8 50%, #60a5fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 2.5rem;
  line-height: 1.75;
}

/* Buttons */
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 24px rgba(139, 92, 246, 0.4);
}

.btn-primary:hover {
  background: #7c3aed;
  box-shadow: 0 0 36px rgba(139, 92, 246, 0.6);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border);
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.04);
}

.btn-lg {
  padding: 0.85rem 2rem;
  font-size: 1rem;
}

/* Stats */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat-num {
  font-size: 1.6rem;
  font-weight: 700;
  background: linear-gradient(135deg, #e2d9f3, #c4b5fd);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--border);
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 6rem 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 520px;
  margin: 0 auto;
}

/* ============================================================
   FILTERS
   ============================================================ */
.filters {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.filter-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.45rem 1.1rem;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.18);
}

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

/* ============================================================
   PROJECTS GRID
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
  box-shadow: var(--shadow-card);
  cursor: default;
  opacity: 1;
  animation: fadeUp 0.5s ease both;
}

.card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(139,92,246,0.15);
  background: var(--bg-card-hover);
}

.card.hidden {
  display: none;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Staggered animation */
.card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2) { animation-delay: 0.1s; }
.card:nth-child(3) { animation-delay: 0.15s; }
.card:nth-child(4) { animation-delay: 0.2s; }
.card:nth-child(5) { animation-delay: 0.25s; }
.card:nth-child(6) { animation-delay: 0.3s; }
.card:nth-child(7) { animation-delay: 0.35s; }
.card:nth-child(8) { animation-delay: 0.4s; }
.card:nth-child(9) { animation-delay: 0.45s; }
.card:nth-child(10) { animation-delay: 0.5s; }

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.1rem;
}

.card-icon {
  font-size: 1.75rem;
  line-height: 1;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.3));
}

.card-badge {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 100px;
}

.featured-badge {
  background: rgba(139, 92, 246, 0.15);
  color: #a78bfa;
  border: 1px solid rgba(139, 92, 246, 0.25);
}

.card-body {
  flex: 1;
}

.card-meta {
  margin-bottom: 0.6rem;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  margin-bottom: 0.55rem;
  color: var(--text-primary);
}

.edition-tag {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  background: rgba(255,255,255,0.06);
  border-radius: 4px;
  padding: 1px 6px;
  vertical-align: middle;
  margin-left: 4px;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin-bottom: 1.25rem;
}

.card-tags li {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
}

.card-footer {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.card-link:hover {
  color: #a78bfa;
}

/* Language badges */
.lang-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 9px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
}

.lang-ts  { background: rgba(49,120,198,0.18); color: #60a5fa; border: 1px solid rgba(49,120,198,0.3); }
.lang-js  { background: rgba(240,219,79,0.12); color: #fbbf24; border: 1px solid rgba(240,219,79,0.25); }
.lang-py  { background: rgba(53,114,165,0.18); color: #7dd3fc; border: 1px solid rgba(53,114,165,0.3); }
.lang-sh  { background: rgba(78,170,37,0.15);  color: #86efac; border: 1px solid rgba(78,170,37,0.25); }
.lang-nb  { background: rgba(218,91,11,0.15);  color: #fdba74; border: 1px solid rgba(218,91,11,0.25); }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-section {
  position: relative;
  overflow: hidden;
}

.contact-inner {
  text-align: center;
  position: relative;
}

.contact-glow {
  position: absolute;
  width: 600px;
  height: 400px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, rgba(139,92,246,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.contact-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto 2.5rem;
  line-height: 1.75;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-gh {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-gh:hover {
  color: var(--text-secondary);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero {
    padding: 7rem 1.5rem 5rem;
  }

  .hero-stats {
    gap: 1.25rem;
  }

  .section-inner {
    padding: 4rem 1.5rem;
  }

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

  .footer-inner {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}