/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  background: #0a0f1e;
  color: #e2e8f0;
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }

/* ===== DESIGN TOKENS ===== */
:root {
  --bg: #0a0f1e;
  --bg-alt: #0d1526;
  --surface: #112240;
  --surface-2: #172a45;
  --accent: #00e5ff;
  --accent-dim: #00b4cc;
  --accent-glow: rgba(0,229,255,0.2);
  --gold: #f6c90e;
  --purple: #a78bfa;
  --text: #e2e8f0;
  --muted: #8892a4;
  --border: rgba(0,229,255,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent-dim); border-radius: 3px; }

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  background: rgba(10,15,30,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: transform 0.3s ease, background 0.3s ease;
}
.navbar.hidden { transform: translateY(-100%); }
.nav-inner {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}
.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  transition: color var(--transition);
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--accent); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh; /* mobile browser address-bar safe */
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
#particles-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}
/* ── Two-column hero layout ── */
.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 4rem;
  padding: 5rem 3rem 3rem;
  max-width: 960px;
  width: 100%;
}

/* ── Photo Card (reference style) ── */
.hero-card {
  flex-shrink: 0;
  width: 260px;
  border-radius: 24px;
  background: #c9d89a; /* sage green from reference */
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255,255,255,0.06);
  overflow: hidden;
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}
.hero-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.6), 0 0 40px rgba(0,229,255,0.12);
}
.hero-card-img {
  width: 100%;
  height: 370px;
  overflow: hidden;
}
.hero-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}
.hero-card-info {
  background: rgba(10, 15, 30, 0.88);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 14px;
  margin: 10px 16px 14px;
  padding: 0.75rem 1rem;
  text-align: center;
  backdrop-filter: blur(8px);
}
.hero-card-info strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: #e2e8f0;
  margin-bottom: 0.2rem;
  letter-spacing: -0.01em;
}
.hero-card-info span {
  font-size: 0.72rem;
  color: #00e5ff;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ── Text column (right) ── */
.hero-text {
  flex: 1;
  min-width: 0;
}
.hero-tagline {
  font-size: 1.15rem;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 2rem;
}
.hero-contact {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
  transition: color var(--transition);
}
.contact-item svg { width: 14px; height: 14px; }
.contact-item:hover { color: var(--accent); }
.contact-sep { color: var(--border); }

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

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.8rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid var(--accent);
}
.btn-primary {
  background: var(--accent);
  color: #0a0f1e;
}
.btn-primary:hover {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-2px);
}
.btn-outline {
  background: transparent;
  color: var(--accent);
}
.btn-outline:hover {
  background: var(--accent-glow);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-2px);
}

/* Hero scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 1;
  animation: bounce 2s infinite;
}
.scroll-arrow {
  width: 20px; height: 20px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(45deg);
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ===== SECTIONS ===== */
.section { padding: 6rem 2rem; }
.section-alt { background: var(--bg-alt); }
.container { max-width: 1100px; margin: 0 auto; }

.section-header { text-align: center; margin-bottom: 4rem; }
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
  padding: 0.3rem 1rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  background: var(--accent-glow);
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}
.section-sub {
  font-size: 1rem;
  color: var(--muted);
  max-width: 500px;
  margin: 0 auto;
}

/* ===== TIMELINE ===== */
.timeline {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--accent), var(--accent), transparent);
  opacity: 0.3;
}
.timeline-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
  position: relative;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 1.5rem;
  transform: translateX(-50%);
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
  z-index: 1;
}
.timeline-item:nth-child(odd) .timeline-period {
  text-align: right;
  padding-right: 3rem;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  padding-top: 1.2rem;
}
.timeline-item:nth-child(odd) .timeline-card { grid-column: 2; }
.timeline-item:nth-child(even) .timeline-period {
  order: 2;
  padding-left: 3rem;
  display: flex;
  align-items: flex-start;
  padding-top: 1.2rem;
}
.timeline-item:nth-child(even) .timeline-card { order: 1; }

.timeline-period {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
  white-space: nowrap;
}
.timeline-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.timeline-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-glow);
  transform: translateY(-2px);
}
.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}
.timeline-role {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.15rem;
}
.timeline-company {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
}
.timeline-desc {
  font-size: 0.87rem;
  color: var(--muted);
  margin-bottom: 1rem;
  line-height: 1.6;
}
.timeline-type {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  white-space: nowrap;
  flex-shrink: 0;
}
.timeline-type.work { background: rgba(0,229,255,0.12); color: var(--accent); }
.timeline-type.edu { background: rgba(167,139,250,0.15); color: var(--purple); }

/* ===== TAGS ===== */
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.25rem 0.65rem;
  border-radius: 100px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--muted);
  transition: var(--transition);
}
.tag:hover { border-color: var(--accent); color: var(--accent); }
.tag-accent { background: var(--accent-glow); border-color: var(--border); color: var(--accent); }
.tag-gold { background: rgba(246,201,14,0.1); border-color: rgba(246,201,14,0.25); color: var(--gold); }
.tag-purple { background: rgba(167,139,250,0.1); border-color: rgba(167,139,250,0.25); color: var(--purple); }

/* ===== PORTFOLIO TABS ===== */
.portfolio-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}
.tab-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
  padding: 0.75rem 1.5rem;
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
  transition: color var(--transition), border-color var(--transition);
}
.tab-btn:hover { color: var(--accent); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ===== PRODUCT CARDS ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.product-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.product-card:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 32px var(--accent-glow);
  transform: translateY(-3px);
}
.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
}
.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.15rem;
}
.card-year {
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 500;
}
.card-badge {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.25rem 0.65rem;
  border-radius: 100px;
  white-space: nowrap;
  flex-shrink: 0;
}
.card-badge.b2c { background: var(--accent-glow); border: 1px solid var(--border); color: var(--accent); }
.card-badge.b2b { background: rgba(167,139,250,0.12); border: 1px solid rgba(167,139,250,0.25); color: var(--purple); }
.card-desc { font-size: 0.88rem; color: var(--muted); line-height: 1.6; }
.card-impact {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
}
.card-impact svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 2px; }

/* ===== SKILLS ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.skill-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.skill-group:hover {
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-glow);
}
.skill-group.group-gold:hover   { border-color: var(--gold);   box-shadow: 0 0 24px rgba(246,201,14,0.15); }
.skill-group.group-purple:hover { border-color: var(--purple); box-shadow: 0 0 24px rgba(167,139,250,0.15); }
.skill-group-icon {
  width: 40px; height: 40px;
  background: var(--accent-glow);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.9rem;
}
.skill-group-icon svg { width: 20px; height: 20px; color: var(--accent); }
.skill-group-title {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 1rem;
}

.bio-quote {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.8;
}

/* ===== STATS BAR ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 4rem;
}
.stat-item {
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.stat-item:hover {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}
.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}
.stat-label {
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===== CONTACT CTA ===== */
.contact-cta { text-align: center; }
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-top: 2.5rem;
}
.contact-link-card {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  transition: all var(--transition);
}
.contact-link-card svg { width: 18px; height: 18px; }
.contact-link-card:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-2px);
}

/* ===== FOOTER ===== */
.footer {
  background: #060b16;
  text-align: center;
  padding: 1.5rem 2rem;
  font-size: 0.82rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

/* ===== SCROLL ANIMATIONS ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: rgba(10,15,30,0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open {
    max-height: 300px;
    padding: 1rem 0;
  }
  .nav-links li { width: 100%; text-align: center; }
  .nav-link { display: block; padding: 0.75rem; }

  /* Timeline stacked */
  .timeline::before { left: 20px; transform: none; }
  .timeline-item {
    grid-template-columns: 1fr;
    padding-left: 48px;
  }
  .timeline-item::before { left: 14px; top: 1rem; }
  .timeline-item:nth-child(odd) .timeline-period,
  .timeline-item:nth-child(even) .timeline-period {
    order: 0;
    text-align: left;
    padding: 0 0 0.5rem 0;
    justify-content: flex-start;
  }
  .timeline-item:nth-child(odd) .timeline-card { grid-column: 1; }
  .timeline-item:nth-child(even) .timeline-card { order: 1; }

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

  /* Hero: stack vertically on mobile */
  .hero-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 5rem 1.5rem 5.5rem;
    gap: 2rem;
  }
  .hero-card { width: 230px; align-self: center; }
  .hero-card-img { height: 295px; }
  .hero-card-info { margin: 8px 18px 12px; padding: 0.65rem 0.75rem; }
  .hero-card-info span { font-size: 0.62rem; letter-spacing: 0.04em; }
  .hero-text { text-align: center; width: 100%; }
  .hero-tagline { font-size: 0.95rem; margin-bottom: 1.5rem; }
  .hero-contact { justify-content: center; flex-direction: column; gap: 0.4rem; margin-bottom: 1.5rem; }
  .hero-ctas { justify-content: center; }
  .contact-sep { display: none; }
}

@media (max-width: 480px) {
  .section { padding: 4rem 1.25rem; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .hero-ctas { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
}