/* ============================================================
   Design tokens
   ============================================================ */
:root {
  --bg-dark:     #09101f;
  --bg-surface:  #0e1829;
  --bg-card:     #131f33;
  --accent:      #2563eb;
  --accent-glow: #3b82f6;
  --cyan:        #06b6d4;
  --text:        #e8edf5;
  --text-muted:  #8b9ab0;
  --light-bg:    #f8fafc;
  --light-text:  #0f172a;
  --light-muted: #64748b;
  --border:      rgba(255,255,255,.08);
  --radius:      10px;
  --max-w:       1080px;
  --nav-h:       68px;
  --transition:  .22s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ============================================================
   Utility
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.section { padding: 96px 0; }
.section--light { background: var(--light-bg); color: var(--light-text); }
.section--dark  { background: var(--bg-surface); }

.label {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent-glow);
  margin-bottom: 12px;
}
.section--light .label { color: var(--accent); }

h2.section-title {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
}

.section--light h2.section-title { color: var(--light-text); }

.section-lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 620px;
  margin-bottom: 56px;
}
.section--light .section-lead { color: var(--light-muted); }

/* ============================================================
   Navigation
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(9, 16, 31, .85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}

.nav.scrolled { box-shadow: 0 4px 32px rgba(0,0,0,.4); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.nav__logo {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--text);
}
.nav__logo span { color: var(--accent-glow); }

.nav__links {
  display: flex;
  gap: 4px;
  align-items: center;
}

.nav__links a {
  padding: 7px 14px;
  border-radius: 6px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
}
.nav__links a:hover,
.nav__links a.active { color: var(--text); background: var(--border); }

.nav__links .btn-nav {
  background: var(--accent);
  color: #fff;
  padding: 7px 18px;
  border-radius: 6px;
}
.nav__links .btn-nav:hover { background: var(--accent-glow); }

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

/* Mobile menu */
.nav__mobile {
  display: none;
  position: fixed;
  inset: var(--nav-h) 0 0;
  background: rgba(9,16,31,.97);
  backdrop-filter: blur(24px);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
}
.nav__mobile.open { display: flex; }
.nav__mobile a {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  transition: color var(--transition);
}
.nav__mobile a:hover { color: var(--accent-glow); }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  min-height: 100vh;
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-h);
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 60% 40%, rgba(37, 99, 235, .18) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 20% 80%, rgba(6,182,212,.10) 0%, transparent 60%);
  pointer-events: none;
}

/* Subtle grid lines */
.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: linear-gradient(to bottom, transparent, rgba(0,0,0,.6) 30%, rgba(0,0,0,.6) 70%, transparent);
}

.hero__content {
  position: relative;
  text-align: center;
  padding: 60px 24px;
  max-width: 780px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(37,99,235,.15);
  border: 1px solid rgba(37,99,235,.3);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--accent-glow);
  text-transform: uppercase;
  margin-bottom: 28px;
}
.hero__badge::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: .5; transform: scale(.8); }
}

.hero h1 {
  font-size: clamp(2.8rem, 8vw, 5.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.03em;
  color: #fff;
  margin-bottom: 20px;
}
.hero h1 span { color: var(--accent-glow); }

.hero__sub {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 44px;
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 24px rgba(37,99,235,.35);
}
.btn-primary:hover {
  background: var(--accent-glow);
  box-shadow: 0 0 36px rgba(59,130,246,.5);
  transform: translateY(-1px);
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: rgba(255,255,255,.2);
  background: rgba(255,255,255,.05);
  transform: translateY(-1px);
}
.btn-outline--dark {
  color: var(--light-text);
  border-color: rgba(0,0,0,.15);
}
.btn-outline--dark:hover {
  background: rgba(0,0,0,.05);
  border-color: rgba(0,0,0,.25);
  transform: translateY(-1px);
}

/* ============================================================
   About / intro strip
   ============================================================ */
.intro {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.intro__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.intro__visual {
  position: relative;
}

.intro__avatar {
  width: 100%;
  max-width: 360px;
  aspect-ratio: 1;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0,0,0,.4);
}

.intro__avatar svg {
  width: 60%;
  height: 60%;
  opacity: .15;
}

.intro__avatar-initials {
  position: absolute;
  font-size: 5rem;
  font-weight: 800;
  color: rgba(255,255,255,.08);
  letter-spacing: -.04em;
  user-select: none;
}

.intro__tag {
  position: absolute;
  bottom: -16px;
  right: -16px;
  background: var(--accent);
  color: #fff;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .04em;
  box-shadow: 0 8px 32px rgba(37,99,235,.4);
}

.intro__text h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 800;
  line-height: 1.18;
  margin-bottom: 20px;
}
.intro__text p {
  color: var(--text-muted);
  font-size: 1.03rem;
  margin-bottom: 16px;
}

/* ============================================================
   Expertise cards
   ============================================================ */
.expertise__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px 28px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.card:hover {
  border-color: rgba(37,99,235,.4);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,.3);
}

.card__icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: rgba(37,99,235,.15);
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  font-size: 1.4rem;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.card p {
  font-size: .9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================
   Experience / CV
   ============================================================ */
.experience-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  align-items: start;
}

.experience-grid .sticky-col {
  position: sticky;
  top: calc(var(--nav-h) + 32px);
}

.timeline { display: flex; flex-direction: column; gap: 4px; }

.timeline-item {
  position: relative;
  padding: 24px 24px 24px 36px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: transparent;
  transition: all var(--transition);
  cursor: default;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: 3px;
  background: var(--border);
  transition: background var(--transition);
}
.timeline-item:hover { background: var(--bg-surface); border-color: var(--border); }
.timeline-item:hover::before { background: var(--accent); }

.timeline-item__meta {
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent-glow);
  margin-bottom: 6px;
}

.timeline-item h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.timeline-item .company {
  font-size: .88rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.timeline-item p {
  font-size: .88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================
   Skills
   ============================================================ */
.skills-section { background: var(--bg-surface); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px;
}

.skill-group h3 {
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent-glow);
  margin-bottom: 20px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  padding: 6px 14px;
  border-radius: 100px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: .82rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
}
.tag:hover { border-color: rgba(37,99,235,.5); color: var(--text); }

/* Light section tags */
.section--light .tag {
  background: #fff;
  border-color: #e2e8f0;
  color: var(--light-muted);
}
.section--light .tag:hover { border-color: var(--accent); color: var(--light-text); }

/* ============================================================
   CTA strip
   ============================================================ */
.cta {
  text-align: center;
  padding: 120px 24px;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 80% at 50% 50%, rgba(37,99,235,.14) 0%, transparent 70%);
  pointer-events: none;
}

.cta h2 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  margin-bottom: 16px;
  position: relative;
}
.cta p {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 40px;
  position: relative;
}
.cta .hero__actions { position: relative; }

/* ============================================================
   Leadership page
   ============================================================ */
.lf-hero {
  padding: 160px 24px 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.lf-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 60% at 30% 50%, rgba(6,182,212,.12) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 70% 50%, rgba(37,99,235,.14) 0%, transparent 60%);
}
.lf-hero > * { position: relative; }
.lf-hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  max-width: 760px;
  margin-inline: auto;
  margin-bottom: 20px;
}
.lf-hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 560px;
  margin-inline: auto;
}

.lf-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 80px;
}

.pillar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 28px;
  position: relative;
  overflow: hidden;
}
.pillar::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  border-radius: 3px 3px 0 0;
}
.pillar__num {
  font-size: 3.5rem;
  font-weight: 800;
  color: rgba(255,255,255,.04);
  line-height: 1;
  margin-bottom: -8px;
}
.pillar h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.pillar p {
  font-size: .9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.lf-essay {
  max-width: 680px;
  margin-inline: auto;
}
.lf-essay h2 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 24px;
}
.lf-essay p {
  font-size: 1.02rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.75;
}
.lf-essay blockquote {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 24px;
  margin: 32px 0;
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text);
  line-height: 1.6;
}

/* ============================================================
   Contact page
   ============================================================ */
.contact-hero {
  padding: 140px 24px 60px;
  text-align: center;
}
.contact-hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  margin-bottom: 16px;
}
.contact-hero p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 480px;
  margin-inline: auto;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 56px;
  align-items: start;
}

.contact-info { }
.contact-info h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.contact-links { display: flex; flex-direction: column; gap: 14px; }
.contact-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: .9rem;
  font-weight: 500;
  transition: all var(--transition);
}
.contact-link:hover { border-color: rgba(37,99,235,.4); color: var(--text); transform: translateX(4px); }
.contact-link__icon {
  width: 38px; height: 38px;
  border-radius: 8px;
  background: rgba(37,99,235,.12);
  display: grid;
  place-items: center;
  font-size: 1rem;
  flex-shrink: 0;
}

/* Form */
.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 36px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin-bottom: 20px;
}

.form-group label {
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: .04em;
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 11px 14px;
  color: var(--text);
  font-family: inherit;
  font-size: .92rem;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}
.form-group select { appearance: none; }
.form-group textarea { resize: vertical; min-height: 120px; }

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); opacity: .6; }

.form-submit {
  display: flex;
  justify-content: flex-end;
}

.form-success {
  display: none;
  background: rgba(6,182,212,.1);
  border: 1px solid rgba(6,182,212,.25);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  color: var(--cyan);
  font-weight: 600;
  margin-top: 16px;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer__logo {
  font-size: 1rem;
  font-weight: 800;
}
.footer__logo span { color: var(--accent-glow); }

.footer__links {
  display: flex;
  gap: 24px;
}
.footer__links a {
  font-size: .85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--text); }

.footer__copy {
  font-size: .8rem;
  color: var(--text-muted);
  width: 100%;
  text-align: center;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
  .intro__grid,
  .experience-grid,
  .contact-layout { grid-template-columns: 1fr; gap: 40px; }

  .expertise__grid { grid-template-columns: 1fr 1fr; }
  .lf-pillars { grid-template-columns: 1fr; }

  .skills-grid { grid-template-columns: 1fr; gap: 32px; }

  .intro__avatar { max-width: 260px; }
  .experience-grid .sticky-col { position: static; }
}

@media (max-width: 640px) {
  .expertise__grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .nav__links { display: none; }
  .nav__toggle { display: flex; }
  .section { padding: 64px 0; }
  .footer__links { display: none; }
  .hero__actions .btn { padding: 11px 20px; font-size: .88rem; }
}