:root {
  --black: #000000;
  --white: #ffffff;
  --gray: #808080;
  --light-gray: #f5f5f5;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--black);
  background-color: var(--white);
  overflow-x: hidden;
  scroll-behavior: smooth;
  width: 100%;
}

.page-wrapper {
  width: 100%;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
  box-sizing: border-box;
}

.nav-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--light-gray);
  z-index: 1000;
  padding: 0.75rem 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.nav-logo {
  font-size: 0.75rem;
  letter-spacing: 0.4em;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.3s ease;
  color: var(--black);
}

.nav-logo.visible {
  opacity: 1;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: var(--gray);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  position: relative;
  padding-bottom: 0.2rem;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 1px;
  background-color: var(--black);
  transition: width 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--black);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: 5px;
  background: none;
  border: none;
  z-index: 1001;
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background-color: var(--black);
  margin: 2px 0;
  transition: 0.3s;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(-45deg) translate(-4px, 4px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(45deg) translate(-4px, -4px);
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding-top: 80px;
  width: 100%;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 200px;
  height: 200px;
  border: 1px solid var(--gray);
  border-radius: 50%;
  opacity: 0.3;
}

.hero-content {
  z-index: 1;
  position: relative;
}

.name {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  animation: fadeInUp 1s ease-out;
}

.title {
  font-size: clamp(1rem, 3vw, 1.5rem);
  color: var(--gray);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  animation: fadeInUp 1s ease-out 0.2s both;
}

.subtitle {
  font-size: clamp(0.9rem, 2.5vw, 1.2rem);
  color: var(--black);
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
  font-weight: 400;
  animation: fadeInUp 1s ease-out 0.3s both;
}

.certifications {
  font-size: 0.9rem;
  color: var(--gray);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  animation: fadeInUp 1s ease-out 0.4s both;
}

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 60px;
  background-color: rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.scroll-indicator::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--black);
  animation: scrollIndicator 3s infinite;
}

.section {
  padding: 5rem 0;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--black);
}

.summary-text {
  font-size: 1.05rem;
  color: #1a1a1a;
  max-width: 1000px;
  margin: 0 auto;
  text-align: justify;
  line-height: 1.8;
}

.competencies-grid,
.industry-grid,
.additional-grid,
.tech-grid {
  display: grid;
  gap: 1.5rem;
}

.competencies-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.industry-grid,
.additional-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.tech-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.competency-item {
  position: relative;
  border: 1px solid rgba(0, 0, 0, 0.06);
  padding: 1.75rem 1.5rem;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(245, 245, 245, 0.96) 100%);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
  opacity: 0;
  transform: translateY(16px);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.competency-item::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 18px;
  border: 1px solid transparent;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0)) border-box;
  mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  transition: opacity 0.35s ease;
  opacity: 0.15;
}

.competency-item h3 {
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  font-weight: 550;
  text-transform: uppercase;
  color: #111111;
  line-height: 1.7;
}

.competency-item.visible {
  opacity: 1;
  transform: translateY(0);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.08);
  border-color: rgba(0, 0, 0, 0.08);
}

@media (hover: hover) {
  .competency-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 26px 50px rgba(0, 0, 0, 0.12);
    border-color: rgba(0, 0, 0, 0.12);
  }

  .competency-item:hover::after {
    opacity: 0.22;
  }
}

.qualifications-list {
  display: grid;
  gap: 2rem;
}

.qualification-item {
  background-color: var(--light-gray);
  padding: 2rem;
  border-radius: 16px;
  border: 1px solid #e0e0e0;
  opacity: 0;
  transform: translateY(20px);
}

.qualification-title {
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  color: var(--black);
}

.qualification-desc {
  color: #333333;
  font-size: 1rem;
  line-height: 1.8;
  white-space: pre-wrap;
}

.qualification-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.patents-list {
  display: grid;
  gap: 2rem;
}

.patent-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(245, 245, 245, 0.96) 100%);
  border-radius: 20px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
  padding: 2.5rem;
  display: grid;
  gap: 1.75rem;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease, box-shadow 0.35s ease;
}

.patent-card.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (hover: hover) {
  .patent-card:hover {
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.14);
  }
}

.patent-header {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
}

.patent-title {
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #111111;
}

.patent-number {
  font-size: 0.95rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: rgba(0, 0, 0, 0.6);
  padding: 0.4rem 1.4rem;
  border-radius: 999px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  background: rgba(255, 255, 255, 0.65);
}

.patent-points {
  display: grid;
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
  color: #333333;
  line-height: 1.85;
  font-size: 1.05rem;
}

.patent-points li {
  position: relative;
  padding-left: 1.75rem;
}

.patent-points li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.75rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
}

.affiliations-text {
  margin-top: 2.5rem;
  padding: 1.75rem 2rem;
  text-align: center;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #1f1f1f;
  background: rgba(0, 0, 0, 0.04);
  border-radius: 16px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.06);
}

.contact {
  padding: 5rem 0;
  background-color: var(--black);
  color: var(--white);
}

.contact .section-title {
  color: var(--white);
}

.contact-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 3rem;
  align-items: start;
}

.contact-text {
  display: grid;
  gap: 1.5rem;
  font-size: 1.05rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
}

.contact-text p {
  margin: 0;
}

.social-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  color: var(--white);
  text-decoration: none;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: transform 0.3s ease, border-color 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
}

.social-link.visible {
  opacity: 1;
  transform: translateY(0);
}

.social-link:hover {
  transform: translateY(-2px);
  border-color: var(--white);
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollIndicator {
  0% {
    top: -100%;
  }

  100% {
    top: 100%;
  }
}

@media (max-width: 992px) {
  .nav-links {
    gap: 1rem;
  }
}

@media (max-width: 768px) {
  .nav-container {
    padding: 0 1.5rem;
  }

  .nav-links {
    position: fixed;
    top: 60px;
    right: 20px;
    background-color: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--light-gray);
    border-radius: 12px;
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 1.2rem;
    transform: translateY(-20px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
  }

  .nav-links.active {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding-top: 100px;
    min-height: 85vh;
  }

  .section {
    padding: 4rem 0;
  }

  .container {
    padding: 0 1.5rem;
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 0 1rem;
  }

  .name {
    letter-spacing: 0.08em;
  }

  .section-title {
    letter-spacing: 0.15em;
  }

  .summary-text {
    text-align: left;
  }
}