@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  
  --clr-dark: #171717;
  --clr-body: #7C7C7C;
  --clr-white: #FFFFFF;
  --clr-cyan: #00E5FF;
  --clr-green: #2ECC71;
  --clr-footer: #525CEB;
  --clr-card-bg: #1E1E1E;
  --clr-border: #2A2A2A;

  
  --ff-sans: 'Inter', system-ui, -apple-system, sans-serif;

  
  --sp-4: 4px;
  --sp-8: 8px;
  --sp-12: 12px;
  --sp-16: 16px;
  --sp-20: 20px;
  --sp-24: 24px;
  --sp-28: 28px;
  --sp-32: 32px;
  --sp-36: 36px;
  --sp-40: 40px;
  --sp-48: 48px;
  --sp-56: 56px;
  --sp-64: 64px;
  --sp-80: 80px;
  --sp-96: 96px;
  --sp-120: 120px;

  
  --container-max: 1232px;

  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --radius-circle: 50%;

  
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--ff-sans);
  color: var(--clr-body);
  background-color: var(--clr-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}

ul,
ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: inherit;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--sp-24);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: #171717;
  border-bottom: 1px solid var(--clr-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
  font-size: 18px;
  font-weight: 700;
  color: var(--clr-white);
  letter-spacing: -0.02em;
}

.logo svg {
  width: 28px;
  height: 28px;
}

.logo-img {
  height: 36px;
  width: auto;
  filter: invert(1) brightness(2);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-36);
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--clr-white);
  position: relative;
  padding-block: var(--sp-4);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--clr-white);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--clr-cyan);
  transition: width var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-8);
  padding: 10px 20px;
  background: transparent;
  color: var(--clr-white);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  border: 1px solid var(--clr-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.nav-cta:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.4);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: var(--sp-8);
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--clr-white);
  border-radius: 2px;
  transition: var(--transition);
}

.hero {
  background: var(--clr-white);
  padding-top: calc(72px + var(--sp-80));
  padding-bottom: var(--sp-96);
}

.hero .container {
  max-width: 75%;
  margin-inline-start: var(--sp-48);
  margin-inline-end: auto;
  padding: var(--sp-48) var(--sp-80) var(--sp-48) var(--sp-64);
  background: #F0F0F0;
  border-radius: var(--radius-lg);
}

.hero-profile {
  display: flex;
  align-items: center;
  gap: var(--sp-24);
  margin-bottom: var(--sp-48);
}

.hero-avatar {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-circle);
  object-fit: cover;
  border: 3px solid #e5e5e5;
}

.hero-meta h2 {
  font-size: 28px;
  font-weight: 600;
  color: var(--clr-dark);
  line-height: 1.3;
}

.hero-meta p {
  font-size: 20px;
  color: var(--clr-body);
  margin-top: 4px;
}

.hero-headline {
  font-size: clamp(40px, 5.5vw, 72px);
  font-weight: 600;
  color: var(--clr-dark);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--sp-28);
}

.hero-subtext {
  font-size: clamp(16px, 1.5vw, 22px);
  color: var(--clr-body);
  line-height: 1.7;
  max-width: 580px;
  margin-bottom: var(--sp-48);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-16);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--clr-dark);
  color: var(--clr-white);
}

.btn-primary:hover {
  background: #2a2a2a;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.btn-outline {
  background: transparent;
  color: var(--clr-dark);
  border: 2px solid var(--clr-dark);
}

.btn-outline:hover {
  background: var(--clr-dark);
  color: var(--clr-white);
  transform: translateY(-2px);
}

.btn-icon {
  width: 18px;
  height: 18px;
}

.features {
  background: var(--clr-dark);
  padding-block: var(--sp-96);
  border-top: 1px solid var(--clr-border);
}

.features .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-64);
  align-items: start;
}

.features-text h2 {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 700;
  color: var(--clr-white);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-20);
}

.features-text p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--clr-body);
  margin-bottom: var(--sp-32);
  max-width: 420px;
}

.btn-cyan {
  background: var(--clr-cyan);
  color: var(--clr-dark);
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  transition: all var(--transition);
}

.btn-cyan:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 229, 255, 0.3);
}

.features-cards {
  display: flex;
  flex-direction: column;
  gap: var(--sp-24);
}

.feature-card {
  display: flex;
  gap: var(--sp-20);
  padding: var(--sp-24);
  background: var(--clr-card-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  transition: transform var(--transition), border-color var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.1);
}

.feature-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.feature-icon.purple {
  background: rgba(56, 189, 248, 0.15);
  color: #38BDF8;
}

.feature-icon.blue {
  background: rgba(56, 189, 248, 0.15);
  color: #38BDF8;
}

.feature-icon.green {
  background: rgba(56, 189, 248, 0.15);
  color: #38BDF8;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--clr-white);
  margin-bottom: var(--sp-4);
}

.feature-card p {
  font-size: 14px;
  color: var(--clr-body);
  line-height: 1.6;
}

.about {
  background: #1c1c1c;
  padding-block: var(--sp-96);
}

.about .container {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto auto;
  gap: 20px;
  align-items: start;
  position: relative;
}

.about-img {
  border-radius: var(--radius-lg);
  object-fit: cover;
  width: 100%;
  transition: transform var(--transition);
}

.about-img:hover {
  transform: scale(1.02);
}

.about-img-main {
  grid-column: 1 / 6;
  grid-row: 1 / 3;
  height: 580px;
  object-position: center top;
  z-index: 1;
}

.about-img-bl {
  grid-column: 2 / 7;
  grid-row: 2;
  height: 300px;
  object-position: center;
  margin-top: 40px;
  z-index: 2;
}

.about-img-br {
  grid-column: 7 / 12;
  grid-row: 2;
  height: 400px;
  object-position: center;
  margin-top: 40px;
  z-index: 1;
}

.about-text {
  grid-column: 7 / 13;
  grid-row: 1;
  padding-top: var(--sp-32);
  z-index: 2;
}

.about-divider {
  width: 40px;
  height: 2px;
  background: var(--clr-white);
  margin-bottom: var(--sp-24);
}

.about-text h2 {
  font-size: clamp(32px, 3.5vw, 48px);
  font-weight: 600;
  color: var(--clr-white);
  margin-bottom: var(--sp-24);
  letter-spacing: -0.02em;
}

.about-text p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--clr-body);
  margin-bottom: var(--sp-28);
  max-width: 420px;
}

.btn-white {
  display: inline-block;
  background: var(--clr-white);
  color: var(--clr-dark);
  padding: 12px 28px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  font-size: 15px;
  transition: all var(--transition);
}

.btn-white:hover {
  background: #f0f0f0;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 255, 255, 0.15);
}

.skills {
  background: var(--clr-dark);
  padding-block: var(--sp-96);
  border-top: 1px solid var(--clr-border);
}

.skills .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-64);
}

.skills-heading {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 600;
  color: var(--clr-white);
  margin-bottom: var(--sp-8);
  letter-spacing: -0.02em;
}

.skills-col h2 {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 600;
  color: var(--clr-white);
  margin-bottom: var(--sp-40);
  letter-spacing: -0.02em;
}

.skill-group {
  margin-bottom: var(--sp-40);
}

.skill-group h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--clr-body);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--sp-20);
}

.skill-bar {
  margin-bottom: var(--sp-20);
}

.skill-bar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-8);
}

.skill-bar-header span {
  font-size: 15px;
  font-weight: 500;
  color: var(--clr-white);
}

.skill-bar-header .percent {
  font-size: 13px;
  color: var(--clr-body);
}

.skill-bar-track {
  width: 100%;
  height: 6px;
  background: var(--clr-card-bg);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  background: var(--clr-green);
  border-radius: var(--radius-pill);
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-8);
  margin-bottom: var(--sp-40);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background: var(--clr-card-bg);
  color: var(--clr-white);
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-pill);
  border: 1px solid var(--clr-border);
  transition: all var(--transition);
}

.tag:hover {
  color: var(--clr-white);
  border-color: rgba(255, 255, 255, 0.15);
  background: #262626;
}

.research-card {
  background: var(--clr-card-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-28);
}

.research-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--clr-white);
  margin-bottom: var(--sp-20);
}

.research-card ul {
  display: flex;
  flex-direction: column;
  gap: var(--sp-12);
}

.research-card li {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-12);
  font-size: 14px;
  color: var(--clr-white);
  line-height: 1.6;
}

.research-card li .check {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-sm);
  background: rgba(46, 204, 113, 0.15);
  color: var(--clr-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  margin-top: 2px;
}

.site-footer {
  background: var(--clr-footer);
  padding-block: var(--sp-80);
  text-align: center;
}

.site-footer h2 {
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 600;
  color: var(--clr-white);
  margin-bottom: var(--sp-8);
  letter-spacing: -0.02em;
}

.site-footer .tagline {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--sp-40);
}

.footer-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-16);
  margin-bottom: var(--sp-40);
}

.footer-links a {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
  position: relative;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--clr-white);
}

.footer-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 1px;
  background: rgba(255, 255, 255, 0.5);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.footer-links a:hover::after {
  transform: scaleX(1);
}

.footer-bottom {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-logo {
  margin-bottom: var(--sp-24);
}

.footer-logo-img {
  height: 48px;
  width: auto;
  margin-inline: auto;
  filter: invert(1) brightness(2);
  opacity: 0.7;
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

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

@media (max-width: 1024px) {

  
  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    background: #171717;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--sp-40);
    z-index: 9999;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    font-size: 28px;
    color: var(--clr-white);
    font-weight: 600;
    letter-spacing: -0.01em;
  }

  .nav-links a::after {
    display: none;
  }

  .nav-cta {
    margin-top: var(--sp-16);
    padding: 16px 40px;
    font-size: 18px;
  }

  .mobile-toggle {
    display: flex;
    z-index: 10000;
  }

  .features .container {
    grid-template-columns: 1fr;
    gap: var(--sp-48);
  }

  .hero .container {
    max-width: calc(100% - var(--sp-48));
    margin-inline: auto;
    padding: var(--sp-32);
  }

  
  .about .container {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto auto;
    gap: var(--sp-24);
  }

  .about-img-main {
    grid-column: 1;
    grid-row: 1;
    height: 400px;
    margin-top: 0;
  }

  .about-text {
    grid-column: 2;
    grid-row: 1;
    padding-top: var(--sp-16);
  }

  .about-img-bl {
    grid-column: 1;
    grid-row: 2;
    height: 260px;
    margin-top: 0;
  }

  .about-img-br {
    grid-column: 2;
    grid-row: 2;
    height: 260px;
    margin-top: 0;
  }

  .skills .container {
    grid-template-columns: 1fr;
    gap: var(--sp-48);
  }
}

@media (max-width: 768px) {
  .site-header .container {
    height: 64px;
  }

  
  .hero {
    padding-top: calc(64px + var(--sp-40));
    padding-bottom: var(--sp-48);
  }

  .hero-headline {
    font-size: clamp(32px, 8vw, 48px);
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero .container {
    max-width: calc(100% - var(--sp-32));
    margin-inline: auto;
    padding: var(--sp-24);
  }

  
  .about .container {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto auto;
    gap: 12px;
  }

  .about-text {
    grid-column: 1 / -1;
    grid-row: 1;
    order: -1;
    padding-top: 0;
  }

  .about-img-main {
    grid-column: 1 / -1;
    grid-row: 2;
    height: 280px;
    margin-top: 0;
  }

  .about-img-bl {
    grid-column: 1;
    grid-row: 3;
    height: 220px;
    margin-top: 0;
  }

  .about-img-br {
    grid-column: 2;
    grid-row: 3;
    height: 220px;
    margin-top: -40px;
  }

  
  .footer-links {
    flex-direction: column;
    gap: var(--sp-16);
  }
}

@media (max-width: 480px) {
  .container {
    padding-inline: var(--sp-16);
  }

  .hero-profile {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-12);
  }

  .research-tags {
    gap: var(--sp-4);
  }

  .tag {
    font-size: 12px;
    padding: 6px 12px;
  }
}