:root {
  --bg: #07111f;
  --bg-soft: #0d1b2f;
  --card: #101f35;
  --card-light: #132844;
  --text: #f4f7fb;
  --muted: #a8b3c7;
  --accent: #56d6ff;
  --accent-2: #8b5cf6;
  --line: rgba(255,255,255,0.12);
  --shadow: 0 24px 70px rgba(0,0,0,0.32);
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, rgba(86,214,255,0.16), transparent 34%), var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.section { padding: 96px 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: rgba(7, 17, 31, 0.78);
  border-bottom: 1px solid var(--line);
}

.nav {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06111f;
  font-weight: 800;
}

.nav-links { display: flex; gap: 28px; align-items: center; color: var(--muted); font-weight: 600; }
.nav-links a:hover { color: var(--text); }
.nav-toggle { display: none; background: transparent; border: 0; color: var(--text); font-size: 1.6rem; }

.hero { padding-top: 130px; }
.hero-grid { display: grid; grid-template-columns: 1.35fr 0.8fr; gap: 48px; align-items: center; }
.eyebrow, .section-label { color: var(--accent); font-weight: 800; text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.78rem; }
.hero h1 { font-size: clamp(3rem, 8vw, 6.5rem); line-height: 0.92; margin: 16px 0; letter-spacing: -0.08em; }
.hero h2 { font-size: clamp(1.45rem, 3vw, 2.25rem); line-height: 1.18; margin: 0; max-width: 900px; letter-spacing: -0.04em; }
.hero-text { color: var(--muted); font-size: 1.12rem; max-width: 720px; margin: 26px 0 34px; }
.hero-actions, .contact-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
  border: 1px solid var(--line);
}
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #06111f; border: none; }
.btn.secondary { color: var(--text); background: rgba(255,255,255,0.05); }
.btn:hover { transform: translateY(-1px); }

.hero-card, .timeline-card, .project-card, .stat-card, .contact-card, .skills-grid > div {
  background: linear-gradient(180deg, rgba(255,255,255,0.075), rgba(255,255,255,0.035));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-card { padding: 34px; }
.profile-circle {
  width: 92px;
  height: 92px;
  border-radius: 28px;
  display: grid;
  place-items: center;
  background: rgba(86,214,255,0.12);
  border: 1px solid rgba(86,214,255,0.38);
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 22px;
}
.hero-card h3, .project-card h3, .skills-grid h3 { margin-top: 0; }
.hero-card ul, .check-list, .skills-grid ul { padding-left: 20px; color: var(--muted); }

.two-column { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 70px; }
.section-title, .two-column h2 { font-size: clamp(2rem, 4vw, 3.3rem); line-height: 1.05; margin: 12px 0 34px; letter-spacing: -0.06em; }
.content-block { color: var(--muted); font-size: 1.06rem; }
.content-block p:first-child { margin-top: 0; }

.stats-section { padding: 30px 0 80px; }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.stat-card { padding: 26px; }
.stat-number { display: block; font-size: 2rem; font-weight: 800; letter-spacing: -0.05em; }
.stat-label { color: var(--muted); }

.timeline-card { padding: 36px; }
.timeline-meta { display: flex; justify-content: space-between; gap: 20px; color: var(--accent); font-weight: 700; margin-bottom: 16px; }
.timeline-card h3 { font-size: 1.6rem; margin: 0 0 12px; }
.timeline-card p { color: var(--muted); }
.check-list li { margin-bottom: 10px; }

.alt-section, .credentials-section { background: rgba(255,255,255,0.025); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.project-card { padding: 28px; }
.project-card p { color: var(--muted); }

.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.skills-grid > div { padding: 28px; }
.skills-grid li { margin-bottom: 9px; }
.credential-list strong { color: var(--text); }

.contact-section { padding-bottom: 120px; }
.contact-card { padding: 46px; text-align: center; }
.contact-card h2 { max-width: 820px; margin: 12px auto 18px; font-size: clamp(2rem, 4vw, 3.2rem); line-height: 1.06; letter-spacing: -0.06em; }
.contact-card p { max-width: 740px; margin: 0 auto 28px; color: var(--muted); }
.contact-actions { justify-content: center; }

.section-intro {
  max-width: 760px;
  color: var(--muted);
  margin-bottom: 2rem;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.cert-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.cert-card h3 {
  margin-bottom: 0.5rem;
}

.cert-issuer,
.cert-meta {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0.25rem 0;
}

.cert-card a {
  display: inline-block;
  margin-top: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
}

.cert-card a:hover {
  text-decoration: underline;
}

.site-footer { border-top: 1px solid var(--line); padding: 26px 0; color: var(--muted); }
.footer-content { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }

@media (max-width: 860px) {
  .section { padding: 72px 0; }
  .hero { padding-top: 96px; }
  .hero-grid, .two-column, .stats-grid, .cards-grid, .skills-grid { grid-template-columns: 1fr; }
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 74px;
    left: 20px;
    right: 20px;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
    border-radius: 18px;
    background: #0d1b2f;
    border: 1px solid var(--line);
  }
  .nav-links.open { display: flex; }
  .timeline-meta { flex-direction: column; }
}

@media (max-width: 520px) {
  .container { width: min(100% - 28px, 1120px); }
  .hero-card, .timeline-card, .contact-card { padding: 26px; }
}