:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
  --radius-lg: 24px;
  --radius-md: 16px;
  --max-width: 1100px;
  --font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
}

a:hover,
a:focus {
  color: var(--accent);
}

.shell {
  width: min(var(--max-width), 92vw);
  margin: 0 auto;
}

.tag {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0;
}

p {
  margin: 0;
}

.section {
  padding: clamp(3rem, 5vw, 4.5rem) 0;
}

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

.section__inner {
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
}

.section__heading {
  max-width: 32rem;
}

.lede {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  color: var(--muted);
  max-width: 40ch;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text);
  background: rgba(255, 255, 255, 0.6);
  box-shadow: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}

.button:hover,
.button:focus {
  transform: translateY(-2px);
  box-shadow: 0 12px 25px rgba(15, 23, 42, 0.12);
}

.button.primary {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.hero {
  background: radial-gradient(circle at top right, rgba(37, 99, 235, 0.2), transparent 55%), var(--surface);
  padding: clamp(3.5rem, 8vw, 5rem) 0 clamp(3rem, 6vw, 4rem);
  border-bottom: 1px solid var(--border);
}

.hero__inner {
  display: grid;
  gap: clamp(2rem, 6vw, 4rem);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: start;
}

.hero__content h1 {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  margin-bottom: 1rem;
}

.cta-group {
  margin-top: 1.8rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.hero__details {
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.2rem;
}

.contact-list span {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.contact-list a,
.contact-list strong {
  font-weight: 600;
}

.jump-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(245, 247, 251, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.jump-nav .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
}

.jump-nav__toggle {
  display: none;
  font: inherit;
  background: none;
  border: 0;
  color: var(--text);
  cursor: pointer;
}

.jump-nav__list {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  font-weight: 500;
  color: var(--muted);
}

.summary-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.summary-grid p {
  color: var(--muted);
}

.quick-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
  color: var(--text);
}

.quick-facts li {
  background: var(--accent-soft);
  padding: 0.8rem 1rem;
  border-radius: var(--radius-md);
}

.card-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card-grid--two {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: 1px solid var(--border);
  box-shadow: 0 12px 25px rgba(15, 23, 42, 0.08);
}

.card h3 {
  margin-bottom: 0.75rem;
}

.card p {
  color: var(--muted);
}

.timeline {
  display: grid;
  gap: 1.75rem;
}

.timeline__item {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.timeline__item header {
  margin-bottom: 1rem;
}

.timeline__item p {
  color: var(--muted);
}

.timeline__item ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  display: grid;
  gap: 0.5rem;
}

.callout {
  margin-top: clamp(2rem, 5vw, 3rem);
  background: var(--accent-soft);
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.callout h3 {
  margin-bottom: 0.5rem;
}

.callout a {
  font-weight: 600;
}

.education {
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.education__list {
  display: grid;
  gap: 1.2rem;
}

.education__list article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.06);
}

.education__list p {
  color: var(--muted);
  margin-top: 0.35rem;
}

.cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  align-content: start;
}

.cert-list li {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--border);
  font-weight: 500;
}

.contact {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: center;
}

.contact p {
  color: var(--muted);
}

.contact__actions {
  display: grid;
  gap: 0.75rem;
  align-content: start;
}

.site-footer {
  padding: 2rem 0 3rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--muted);
}

.back-to-top {
  font-weight: 600;
  text-decoration: none;
  color: var(--accent);
}

.back-to-top:hover,
.back-to-top:focus {
  text-decoration: underline;
}

@media (max-width: 720px) {
  .jump-nav .shell {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .jump-nav__toggle {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.25rem;
    font-weight: 600;
  }

  .jump-nav__list {
    display: none;
    flex-direction: column;
    gap: 0.5rem;
  }

  .jump-nav__list.is-open {
    display: flex;
  }
}