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

:root {
  --navy: #0a0f1e;
  --navy-mid: #111827;
  --slate: #1e2a3a;
  --accent: #4f8ef7;
  --accent-light: #7faaff;
  --text-primary: #f0f4ff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(255,255,255,0.08);
  --card-bg: rgba(255,255,255,0.04);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'DM Serif Display', Georgia, serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--navy);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* === Nav === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 15, 30, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-name {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  color: var(--text-primary);
}

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

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 450;
  transition: color 0.2s;
}

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

/* === Hero === */
.hero {
  padding: 140px 2rem 100px;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(79,142,247,0.12) 0%, transparent 70%),
              linear-gradient(180deg, var(--navy) 0%, var(--navy-mid) 100%);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: 900px;
  margin: 0 auto;
}

.hero-content {
  display: flex;
  align-items: center;
  gap: 4rem;
}

.hero-text {
  flex: 1;
  min-width: 0;
}

.hero-photo-wrap {
  flex-shrink: 0;
}

.hero-photo {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 3px solid rgba(79,142,247,0.35);
  box-shadow: 0 0 0 6px rgba(79,142,247,0.08), 0 20px 60px rgba(0,0,0,0.4);
  display: block;
}

.hero-eyebrow {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 400;
  line-height: 1.05;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}

.hero-tagline {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.5rem;
  max-width: 620px;
}

.hero-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dot { color: var(--text-muted); }

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.badge {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  background: rgba(79,142,247,0.12);
  border: 1px solid rgba(79,142,247,0.25);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-light);
  letter-spacing: 0.01em;
}

/* === Sections === */
.section {
  padding: 80px 2rem;
  border-bottom: 1px solid var(--border);
}

.section--alt {
  background: var(--navy-mid);
}

.section-inner {
  max-width: 900px;
  margin: 0 auto;
}

.section-inner--center {
  text-align: center;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 2.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.section-title--light {
  border-color: rgba(255,255,255,0.15);
}

/* === About === */
.about-text p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.85;
  max-width: 750px;
}

/* === Timeline === */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.timeline-item {
  padding: 1.75rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.2s;
}

.timeline-item:hover {
  border-color: rgba(79,142,247,0.3);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.25rem;
}

.role-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.role-company {
  font-size: 0.9rem;
  color: var(--accent-light);
  font-weight: 500;
}

.role-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  padding-top: 0.2rem;
}

.role-location {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  margin-top: 0.15rem;
}

.role-bullets {
  margin-top: 0.75rem;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.role-bullets li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.role-bullets strong {
  color: var(--accent-light);
}

/* === Education === */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1.25rem;
}

.edu-card {
  padding: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.2s;
}

.edu-card:hover {
  border-color: rgba(79,142,247,0.3);
}

.edu-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.edu-card-header h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.edu-badge {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  background: rgba(79,142,247,0.12);
  border: 1px solid rgba(79,142,247,0.2);
  border-radius: 100px;
  color: var(--accent-light);
  white-space: nowrap;
}

.edu-institution {
  font-size: 0.875rem;
  color: var(--accent-light);
  margin-bottom: 0.25rem;
}

.edu-date {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.edu-detail {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* === Publications === */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-left: 1.5rem;
}

.publications-list li p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.publications-list strong {
  color: var(--text-primary);
}

.publications-list em {
  color: var(--text-muted);
}

/* === Skills === */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1.5rem;
}

.skill-group {
  padding: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.skill-group-title {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tags span {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* === Awards === */
.awards-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.awards-list li {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.awards-list li:last-child {
  border-bottom: none;
}

.award-year {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
  min-width: 70px;
  letter-spacing: 0.04em;
}

.award-title {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* === Contact === */
.section--contact {
  background: linear-gradient(135deg, var(--slate) 0%, var(--navy) 100%);
  border-bottom: none;
  padding: 100px 2rem;
}

.contact-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.contact-btn {
  display: inline-block;
  padding: 0.85rem 2rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: background 0.2s, transform 0.15s;
}

.contact-btn:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
}

.contact-btn--secondary {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent-light);
  margin-left: 1rem;
}

.contact-btn--secondary:hover {
  background: rgba(79,142,247,0.15);
  border-color: var(--accent-light);
}

/* === Footer === */
.footer {
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--navy);
  border-top: 1px solid var(--border);
}

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

  .hero {
    padding: 100px 1.5rem 60px;
  }

  .hero-content {
    flex-direction: column-reverse;
    gap: 2rem;
    align-items: flex-start;
  }

  .hero-photo {
    width: 160px;
    height: 160px;
  }

  .section {
    padding: 60px 1.5rem;
  }

  .timeline-header {
    flex-direction: column;
    gap: 0.25rem;
  }

  .edu-grid,
  .skills-grid {
    grid-template-columns: 1fr;
  }

  .awards-list li {
    flex-direction: column;
    gap: 0.25rem;
  }
}