:root {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-surface-alt: #14213d;
  --color-text: #e2e8f0;
  --color-muted: #94a3b8;
  --color-primary: #38bdf8;
  --color-primary-soft: rgba(56, 189, 248, 0.15);
  --color-border: rgba(148, 163, 184, 0.24);
  --shadow-soft: 0 24px 48px rgba(15, 23, 42, 0.35);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --transition: all 0.3s ease;
}
.light-theme {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f5f9;
  --color-text: #0f172a;
  --color-muted: #475569;
  --color-border: rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 18px 36px rgba(15, 23, 42, 0.08);
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--color-text);
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.15), transparent 50%), var(--color-bg);
  line-height: 1.6;
}
a {
  color: inherit;
  text-decoration: none;
}
a:hover,
button:hover {
  opacity: 0.9;
}
.header {
  position: relative;
  min-height: 90vh;
  padding: 32px clamp(1.5rem, 5vw, 4rem) 64px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.18), rgba(14, 116, 144, 0.12));
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto 64px;
}
.nav__brand {
  font-weight: 700;
  letter-spacing: 1px;
  font-size: 1.1rem;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav__links a {
  position: relative;
  font-weight: 500;
  color: var(--color-muted);
  transition: var(--transition);
}
.nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}
.nav__links a:hover,
.nav__links a.is-active {
  color: var(--color-text);
}
.nav__links a:hover::after,
.nav__links a.is-active::after {
  transform: scaleX(1);
}
.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--color-primary);
  color: #0f172a;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: 0 12px 32px rgba(56, 189, 248, 0.35);
}
.nav__cta:hover {
  box-shadow: 0 16px 40px rgba(56, 189, 248, 0.45);
}
.nav__toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
}
.nav__toggle span {
  width: 24px;
  height: 2px;
  background: currentColor;
  transition: var(--transition);
}
.hero {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: 32px;
  align-content: start;
}
.hero__badge {
  display: inline-flex;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: 600;
  width: fit-content;
}
.hero__title {
  font-size: clamp(2.75rem, 6vw, 4rem);
  letter-spacing: -1px;
  margin: 0;
  line-height: 1.05;
}
.hero__subtitle {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  max-width: 680px;
  color: var(--color-muted);
  margin: 0;
}
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  color: var(--color-muted);
}
.hero__meta a {
  color: var(--color-text);
  font-weight: 500;
}
.hero__cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  transition: var(--transition);
}
.btn--primary {
  background: var(--color-primary);
  color: #0f172a;
  border-color: transparent;
  box-shadow: 0 18px 36px rgba(56, 189, 248, 0.35);
}
.btn--primary:hover {
  box-shadow: 0 22px 48px rgba(56, 189, 248, 0.45);
}
main {
  padding: 0 clamp(1.5rem, 5vw, 4rem) 96px;
}
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 96px 0;
}
.section--alt {
  position: relative;
}
.section--alt::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  opacity: 0.55;
  transform: scale(0.98);
  z-index: -1;
}
.section__heading {
  max-width: 720px;
  margin-bottom: 48px;
}
.section__heading h2 {
  font-size: clamp(2rem, 4vw, 2.6rem);
  margin-bottom: 16px;
}
.section__heading p {
  margin: 0;
  color: var(--color-muted);
}
.grid {
  display: grid;
  gap: 32px;
}
.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--color-border);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 26px 48px rgba(15, 23, 42, 0.25);
}
.card h3 {
  margin-top: 0;
}
.card ul {
  margin: 16px 0 0;
  padding-left: 18px;
  color: var(--color-muted);
}
.timeline {
  display: grid;
  gap: 32px;
  position: relative;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, rgba(56, 189, 248, 0.3), transparent 75%);
}
.timeline__item {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 32px 32px 32px 48px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  position: relative;
}
.timeline__item::before {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  left: 6px;
  top: 32px;
  box-shadow: 0 0 0 6px rgba(56, 189, 248, 0.15);
}
.timeline__period {
  font-weight: 600;
  color: var(--color-muted);
}
.timeline__item h3 {
  margin-top: 12px;
  margin-bottom: 16px;
}
.timeline__item ul {
  margin: 0;
  padding-left: 18px;
  color: var(--color-muted);
}
.skills {
  display: grid;
  gap: 24px;
}
.skills__group {
  background: var(--color-surface);
  padding: 24px 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
}
.skills__group h3 {
  margin: 0 0 12px;
}
.skills__group p {
  margin: 0;
  color: var(--color-muted);
}
.certifications {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.certifications li {
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  color: var(--color-muted);
}
.contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.contact__card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 32px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
}
.contact__card h3 {
  margin-top: 0;
}
.contact__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  margin-bottom: 12px;
}
.footer {
  text-align: center;
  padding: 32px;
  color: var(--color-muted);
  font-size: 0.9rem;
}
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}
.theme-toggle:hover {
  transform: translateY(-2px);
}
[data-animate] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (max-width: 1024px) {
  .nav {
    margin-bottom: 48px;
  }
}
@media (max-width: 860px) {
  .nav__links {
    position: absolute;
    top: 76px;
    right: clamp(1.5rem, 5vw, 4rem);
    background: var(--color-surface);
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-soft);
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    border: 1px solid var(--color-border);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    transition: var(--transition);
  }
  .nav__links.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  .nav__toggle {
    display: flex;
  }
  .nav__actions {
    margin-left: auto;
  }
}
@media (max-width: 640px) {
  .header {
    padding: 24px 1.5rem 56px;
  }
  main {
    padding: 0 1.5rem 80px;
  }
  .nav__cta {
    display: none;
  }
  .timeline::before {
    left: 8px;
  }
  .timeline__item {
    padding-left: 40px;
  }
  .timeline__item::before {
    left: 2px;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}