@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Fira+Code:wght@400;500&display=swap');

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

:root {
  --accent:       #6366f1;
  --accent-light: #a5b4fc;
  --accent-bg:    #eef2ff;
  --accent-glow:  rgba(99,102,241,0.15);
  --text-1: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --surface:      #ffffff;
  --surface-2:    #f8fafc;
  --border:       #e2e8f0;
  --radius:       14px;
  --nav-h:        68px;
  --transition:   0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--surface);
  color: var(--text-1);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ───────────────────────────────────────────── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 2rem;
  transition: box-shadow var(--transition);
}
nav.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.06); }

.nav-inner {
  max-width: 1100px; width: 100%; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  font-size: 1.1rem; font-weight: 700;
  color: var(--text-1); text-decoration: none;
  letter-spacing: -0.02em;
}
.nav-logo span { color: var(--accent); }

.nav-links { display: flex; gap: 0.25rem; list-style: none; }
.nav-links a {
  text-decoration: none;
  color: var(--text-2);
  font-size: 0.875rem; font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  transition: all var(--transition);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--accent);
  background: var(--accent-bg);
}

/* ── HERO ──────────────────────────────────────────── */
#hero {
  min-height: 100vh;
  display: flex; align-items: center;
  padding: calc(var(--nav-h) + 3rem) 2rem 4rem;
  background: linear-gradient(160deg, #fff 0%, #f1f5f9 60%, var(--accent-bg) 100%);
}

.hero-inner {
  max-width: 1100px; width: 100%; margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero-text h1 .hi {
  font-size: 1.2rem; font-weight: 500;
  color: var(--text-2);
  display: block;
  margin-bottom: 0.5rem;
  letter-spacing: 0;
}

.hero-text h1 .name { color: var(--text-1); }
.hero-text h1 .role {
  color: var(--accent);
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 520px;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-chips {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.chip {
  font-size: 0.78rem; font-weight: 500;
  padding: 0.35rem 0.85rem;
  border-radius: 100px;
  background: var(--accent-bg);
  color: var(--accent);
  border: 1px solid var(--accent-light);
}

.hero-ctas { display: flex; gap: 0.75rem; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.875rem; font-weight: 600;
  padding: 0.65rem 1.3rem;
  border-radius: 10px;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 12px var(--accent-glow);
}
.btn-primary:hover {
  background: #4f46e5;
  box-shadow: 0 4px 20px rgba(99,102,241,0.3);
  transform: translateY(-1px);
}
.btn-ghost {
  background: var(--surface);
  color: var(--text-1);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.hero-photo {
  position: relative;
  flex-shrink: 0;
}
.hero-photo::before {
  content: '';
  position: absolute; inset: -8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #8b5cf6, #ec4899);
  z-index: 0;
  opacity: 0.25;
  filter: blur(16px);
}
.hero-photo img {
  width: 240px; height: 240px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid #fff;
  box-shadow: 0 8px 40px rgba(99,102,241,0.15);
  position: relative; z-index: 1;
  transition: transform 0.4s ease;
}
.hero-photo img:hover { transform: scale(1.03); }

/* ── SECTION SHARED ────────────────────────────────── */
section { padding: 5rem 2rem; }
section:nth-child(even) { background: var(--surface-2); }

.section-inner { max-width: 1100px; margin: 0 auto; }

.section-label {
  font-size: 0.75rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-1);
  margin-bottom: 3rem;
}

/* ── EXPERIENCE ────────────────────────────────────── */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: '';
  position: absolute; left: 0; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-light), transparent);
  border-radius: 2px;
}

.tl-item {
  position: relative;
  padding: 1.75rem 0 1.75rem 1.75rem;
  border-bottom: 1px solid var(--border);
}
.tl-item:last-child { border-bottom: none; }
.tl-item::before {
  content: '';
  position: absolute; left: -1.5rem; top: 2rem;
  width: 10px; height: 10px;
  background: var(--accent);
  border-radius: 50%;
  border: 2px solid var(--surface);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.tl-meta {
  display: flex; align-items: center; gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.4rem;
}
.tl-company {
  font-size: 1.05rem; font-weight: 700; color: var(--text-1);
}
.tl-role {
  font-size: 0.85rem; font-weight: 500;
  color: var(--accent);
  background: var(--accent-bg);
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
}
.tl-period {
  font-size: 0.8rem; color: var(--text-3);
  margin-left: auto;
}
.tl-location {
  font-size: 0.82rem; color: var(--text-3);
  margin-bottom: 0.75rem;
}
.tl-points {
  list-style: none; padding: 0;
  display: flex; flex-direction: column; gap: 0.4rem;
}
.tl-points li {
  font-size: 0.9rem; color: var(--text-2);
  padding-left: 1.1rem;
  position: relative;
}
.tl-points li::before {
  content: '▸';
  position: absolute; left: 0;
  color: var(--accent);
  font-size: 0.75rem;
  top: 0.1rem;
}

/* ── SKILLS ────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all var(--transition);
}
.skill-card:hover {
  border-color: var(--accent-light);
  box-shadow: 0 4px 20px var(--accent-glow);
  transform: translateY(-2px);
}

.skill-card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}
.skill-card h3 {
  font-size: 0.9rem; font-weight: 700;
  color: var(--text-1);
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}
.skill-tags {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
}
.skill-tag {
  font-size: 0.75rem; font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  background: var(--surface-2);
  color: var(--text-2);
  border: 1px solid var(--border);
}

/* ── PUBLICATIONS ──────────────────────────────────── */
.pub-list { display: flex; flex-direction: column; gap: 1rem; }
.pub-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  transition: all var(--transition);
}
.pub-card:hover {
  box-shadow: 0 4px 20px var(--accent-glow);
  transform: translateX(2px);
}
.pub-card h3 {
  font-size: 0.95rem; font-weight: 600;
  color: var(--text-1); margin-bottom: 0.4rem;
}
.pub-card a {
  font-size: 0.82rem; color: var(--accent);
  text-decoration: none; font-weight: 500;
}
.pub-card a:hover { text-decoration: underline; }
.pub-venue {
  font-size: 0.8rem; color: var(--text-3);
  margin-top: 0.25rem;
}

/* ── EDUCATION ─────────────────────────────────────── */
.edu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex; gap: 1.5rem; align-items: flex-start;
  transition: all var(--transition);
}
.edu-card:hover {
  border-color: var(--accent-light);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.edu-icon {
  font-size: 2rem; flex-shrink: 0;
}
.edu-info h3 {
  font-size: 1.05rem; font-weight: 700; color: var(--text-1);
  margin-bottom: 0.25rem;
}
.edu-info p { font-size: 0.875rem; color: var(--text-2); }
.edu-badge {
  display: inline-block;
  font-size: 0.78rem; font-weight: 600;
  padding: 0.25rem 0.7rem;
  border-radius: 100px;
  background: #fef9c3; color: #92400e;
  border: 1px solid #fde68a;
  margin-top: 0.5rem;
}

/* ── CONTACT ───────────────────────────────────────── */
#contact { background: var(--text-1); }
#contact .section-label { color: var(--accent-light); }
#contact .section-title { color: #fff; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-desc {
  font-size: 1rem; color: #94a3b8; line-height: 1.7;
  margin-bottom: 2rem;
}

.contact-links { display: flex; flex-direction: column; gap: 0.75rem; }
.contact-link {
  display: flex; align-items: center; gap: 0.75rem;
  color: #cbd5e1; text-decoration: none;
  font-size: 0.9rem; font-weight: 500;
  padding: 0.75rem 1rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  transition: all var(--transition);
}
.contact-link:hover {
  background: rgba(99,102,241,0.15);
  border-color: var(--accent);
  color: white;
  transform: translateX(4px);
}
.contact-link-icon { font-size: 1.1rem; }

.cert-grid { display: flex; flex-direction: column; gap: 0.75rem; }
.cert-card {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.9rem 1rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
}
.cert-card span:first-child { font-size: 1.2rem; }
.cert-card .cert-name { font-size: 0.875rem; font-weight: 600; color: #e2e8f0; }
.cert-card .cert-issuer { font-size: 0.78rem; color: #64748b; }

/* ── FOOTER ────────────────────────────────────────── */
footer {
  background: #020617;
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: #334155;
}

/* ── SCROLL ANIMATIONS ─────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── SCROLLBAR ─────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--surface-2); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-light); }

/* ── RESPONSIVE ────────────────────────────────────── */
@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; gap: 2rem; }
  .hero-photo { display: flex; justify-content: center; order: -1; }
  .hero-photo img { width: 160px; height: 160px; }
  .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
  .tl-period { margin-left: 0; width: 100%; }
  .nav-links { display: none; }
}