:root {
  --bg: #0f172a;
  --bg-soft: #111827;
  --card: #ffffff;
  --card-soft: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #38bdf8;
  --border: #e2e8f0;
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.16), transparent 32rem),
    linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%);
  line-height: 1.6;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 30;
  padding: 10px 14px;
  border-radius: 6px;
  color: white;
  background: var(--primary);
  text-decoration: none;
  font-weight: 800;
  transform: translateY(-140%);
  transition: transform 0.15s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

a:focus-visible,
.btn:focus-visible {
  outline: 3px solid rgba(56, 189, 248, 0.72);
  outline-offset: 4px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #111827;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.16);
}

.nav {
  max-width: 1160px;
  margin: 0 auto;
  min-height: 76px;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.brand {
  color: white;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0;
  font-size: 1.18rem;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.84);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 10px 14px;
  border-radius: 6px;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: white;
  background: rgba(37, 99, 235, 0.72);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.hero {
  max-width: 1160px;
  margin: 0 auto;
  padding: 82px 24px 56px;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) 380px;
  gap: 32px;
  align-items: center;
}

.hero-content {
  padding: 12px 0;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--primary);
  text-transform: uppercase;
  font-weight: 800;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0;
  max-width: 820px;
  font-size: 4rem;
  line-height: 0.98;
  letter-spacing: 0;
  color: #0f172a;
}

.hero-text {
  max-width: 760px;
  margin: 24px 0 0;
  font-size: 1.12rem;
  color: #475569;
}

.hero-actions {
  margin-top: 30px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 18px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 800;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: white;
  background: var(--primary);
  box-shadow: 0 12px 26px rgba(37, 99, 235, 0.28);
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  color: #172554;
  background: white;
  border-color: var(--border);
}

.disabled {
  opacity: 0.65;
  cursor: not-allowed;
  pointer-events: none;
}

.hero-tags {
  margin-top: 26px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.hero-tags span,
.badge {
  display: inline-flex;
  align-items: center;
  padding: 7px 10px;
  border-radius: 6px;
  background: rgba(37, 99, 235, 0.08);
  color: #1d4ed8;
  font-weight: 800;
  font-size: 0.82rem;
}

.hero-card {
  background: linear-gradient(180deg, #111827, #0f172a);
  color: white;
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.avatar {
  width: 88px;
  height: 88px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 2rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  margin-bottom: 22px;
}

.card-label {
  display: inline-block;
  margin: 0 0 12px;
  padding: 6px 10px;
  border-radius: 6px;
  background: rgba(56, 189, 248, 0.14);
  color: #7dd3fc;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero-card h2 {
  margin: 0 0 8px;
  font-size: 1.5rem;
}

.hero-card-text {
  margin: 0;
  color: #cbd5e1;
}

.focus-list {
  margin-top: 24px;
  display: grid;
  gap: 14px;
}

.focus-list > div {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
}

.focus-icon {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  background: rgba(37, 99, 235, 0.28);
  color: #bfdbfe;
  font-size: 0.8rem;
  font-weight: 900;
}

.focus-list strong {
  display: block;
  color: white;
  margin-bottom: 3px;
}

.focus-list p {
  margin: 0;
  color: #cbd5e1;
  font-size: 0.92rem;
}

.section {
  max-width: 1160px;
  margin: 24px auto;
  padding: 40px 24px;
  scroll-margin-top: 82px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 24px;
}

.section-heading h2,
.contact-section h2 {
  margin: 0;
  font-size: 2.35rem;
  line-height: 1.1;
  letter-spacing: 0;
}

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

.two-columns {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) 420px;
  gap: 24px;
  align-items: start;
}

.two-columns > div,
.highlight-box,
.project-card,
.skill-card,
.cv-box,
.article-list article,
.contact-section {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 10px 32px rgba(15, 23, 42, 0.06);
}

.two-columns > div:first-child {
  padding: 28px;
}

.highlight-box {
  padding: 28px;
}

.highlight-box h3 {
  margin-top: 0;
}

.highlight-box ul {
  padding-left: 20px;
  margin-bottom: 0;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.project-card {
  padding: 28px;
  background: rgba(255, 255, 255, 0.9);
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.project-card.featured {
  background: rgba(255, 255, 255, 0.9);
}

.project-card:hover,
.project-card.featured:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(37, 99, 235, 0.22);
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(56, 189, 248, 0.12)),
    white;
}

.card-topline {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.project-card h3,
.skill-card h3,
.article-list h3,
.cv-box h3 {
  margin: 0 0 10px;
  letter-spacing: 0;
}

.project-card p,
.skill-card p,
.article-list p,
.cv-box p {
  color: var(--muted);
}

.card-link {
  display: inline-block;
  margin-top: 10px;
  color: var(--primary);
  font-weight: 800;
  text-decoration: none;
}

.card-status {
  display: inline-flex;
  margin-top: 10px;
  padding: 7px 10px;
  border-radius: 6px;
  color: #334155;
  background: #f1f5f9;
  font-size: 0.86rem;
  font-weight: 800;
}

.card-link:hover {
  text-decoration: underline;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
}

.skill-card {
  padding: 24px;
}

.timeline {
  position: relative;
  display: grid;
  gap: 18px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 16px;
  padding: 22px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.timeline-marker {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  margin-top: 7px;
  background: var(--primary);
  box-shadow: 0 0 0 6px rgba(37, 99, 235, 0.12);
}

.timeline-item h3 {
  margin: 0 0 6px;
}

.timeline-item p {
  margin: 0;
  color: var(--muted);
}

.article-list {
  display: grid;
  gap: 14px;
}

.article-list article {
  padding: 22px;
}

.article-list span {
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.cv-box {
  padding: 28px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) 360px;
  gap: 28px;
  align-items: center;
  padding: 34px;
  background: #0f172a;
  color: white;
}

.contact-section p {
  color: #cbd5e1;
}

.contact-links {
  display: grid;
  gap: 12px;
}

.contact-links a {
  display: block;
  padding: 14px 16px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  color: white;
  text-decoration: none;
  font-weight: 800;
}

.contact-links a:hover {
  background: rgba(255, 255, 255, 0.14);
}

.footer {
  max-width: 1160px;
  margin: 0 auto;
  padding: 32px 24px 48px;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 1100px) {
  .hero h1 {
    font-size: 3.35rem;
  }

  .skills-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 980px) {
  .hero,
  .two-columns,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero-card {
    max-width: 560px;
  }
}

@media (max-width: 700px) {
  .nav {
    min-height: auto;
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
    padding: 14px 18px;
  }

  .nav-links {
    gap: 8px;
    width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: none;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-links a {
    display: block;
    white-space: nowrap;
    padding: 8px 10px;
  }

  .hero {
    padding-top: 54px;
  }

  .hero h1 {
    font-size: 2.65rem;
    line-height: 1.04;
  }

  .section-heading h2,
  .contact-section h2 {
    font-size: 1.95rem;
  }

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

  .section {
    padding: 28px 18px;
    scroll-margin-top: 128px;
  }

  .cv-box {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  .hero h1 {
    font-size: 2.25rem;
  }

  .hero,
  .section {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-card,
  .project-card,
  .skill-card,
  .highlight-box,
  .two-columns > div:first-child,
  .cv-box,
  .article-list article,
  .contact-section {
    padding: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .btn:hover,
  .project-card:hover,
  .project-card.featured:hover {
    transform: none;
  }
}