:root {
  color-scheme: dark;
  --bg-color: #05070f;
  --bg-elevated: rgba(9, 13, 23, 0.85);
  --text-primary: #f7f9fc;
  --text-secondary: rgba(247, 249, 252, 0.72);
  --accent: #42ffb3;
  --accent-strong: #5cffc1;
  --accent-soft: rgba(66, 255, 179, 0.2);
  --border-color: rgba(255, 255, 255, 0.08);
  --muted: rgba(255, 255, 255, 0.04);
  --container-width: min(1100px, 90vw);
  --shadow: 0 30px 50px rgba(0, 0, 0, 0.45);
  --transition: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --hover-scale: 1.04;
  --hover-scale-cta: 1.09;
  --hover-scale-card: 1.03;
  --delay-unit: 0.1s;
}

html {
  scroll-behavior: smooth;
}

* {
  box-sizing: border-box;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
  border-radius: 0.75rem;
  filter: saturate(0.95);
  transition: filter var(--transition), transform var(--transition);
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.7;
}

::selection {
  background: rgba(66, 255, 179, 0.35);
  color: #00110b;
}

.container {
  width: var(--container-width);
  margin: 0 auto;
  padding: 0 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(5, 7, 15, 0.78);
  border-bottom: 1px solid var(--muted);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.site-header.is-scrolled {
  background: rgba(5, 7, 15, 0.92);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
}

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

.brand {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  transition: transform var(--transition), color var(--transition), text-shadow var(--transition);
}

.brand:hover,
.brand:focus-visible {
  transform: scale(var(--hover-scale));
  color: var(--accent-strong);
  text-shadow: 0 0 18px rgba(66, 255, 179, 0.45);
}

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

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.35rem;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.nav__toggle-line {
  width: 26px;
  height: 2px;
  background: var(--text-primary);
  display: block;
  margin: 5px 0;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle[aria-expanded='true'] .nav__toggle-line:first-child {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded='true'] .nav__toggle-line:last-child {
  transform: translateY(-7px) rotate(-45deg);
}

.nav__toggle[aria-expanded='true'] .nav__toggle-line:nth-child(2) {
  opacity: 0;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__links li {
  position: relative;
}

.nav__links a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding-bottom: 0.15rem;
  transition: color var(--transition), transform var(--transition);
}

.nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav__links a:hover,
.nav__links a:focus-visible {
  color: var(--accent);
  transform: scale(var(--hover-scale));
}

.nav__links a:hover::after,
.nav__links a:focus-visible::after {
  width: 100%;
}

.hero {
  position: relative;
  padding: 9rem 0 8rem;
  min-height: 88vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 20% 20%, rgba(66, 255, 179, 0.08), transparent 45%),
    radial-gradient(circle at 80% 10%, rgba(66, 255, 179, 0.12), transparent 40%),
    radial-gradient(circle at 50% 80%, rgba(148, 102, 255, 0.08), transparent 55%);
}

.hero .container {
  max-width: 760px;
}

.eyebrow {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.32rem;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 1.1rem;
}

.hero__title {
  font-size: clamp(2.9rem, 5vw, 4.6rem);
  margin: 0;
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  line-height: 1.05;
}

.hero__subtitle {
  font-size: clamp(1.45rem, 2.5vw, 2.1rem);
  font-weight: 500;
  color: var(--text-secondary);
  margin: 1.6rem 0;
}

.hero__description {
  color: var(--text-secondary);
  margin-bottom: 2.6rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.7rem;
  border-radius: 999px;
  font-weight: 500;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-primary);
  transform: translateY(0) scale(1);
  transition: transform var(--transition), box-shadow var(--transition), color var(--transition), background var(--transition), border-color var(--transition);
}

.btn--primary {
  background: var(--accent);
  color: #00110b;
  border-color: transparent;
  box-shadow: 0 22px 38px rgba(66, 255, 179, 0.2);
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--accent);
  transform: translateY(-2px) scale(var(--hover-scale-cta));
  box-shadow: 0 26px 48px rgba(66, 255, 179, 0.28);
}

.hero__indicator {
  position: absolute;
  bottom: 2.6rem;
  left: auto;
  right: auto;
  width: min(760px, var(--container-width));
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: rgba(247, 249, 252, 0.6);
}

.hero__indicator-arrow {
  position: relative;
  width: 1px;
  height: 42px;
  background: linear-gradient(180deg, transparent, var(--accent));
  overflow: hidden;
}

.hero__indicator-arrow::after {
  content: '';
  position: absolute;
  top: -10px;
  left: 50%;
  width: 8px;
  height: 8px;
  border-left: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  transform: translate(-50%, 0) rotate(-45deg);
  animation: arrow-bounce 2.4s infinite;
  animation-play-state: paused;
}

.section {
  padding: 6rem 0;
}

.section__inner {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.section__header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.section__title {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.5rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.section__title span {
  color: var(--accent);
  font-size: 1rem;
}

.section__line {
  flex: 1;
  height: 1px;
  background: var(--muted);
}

.about {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 3rem;
}

.about__content p {
  margin: 0 0 1.6rem;
  color: var(--text-secondary);
}

.skills {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.8rem;
  padding: 0;
  margin: 2.1rem 0 0;
}

.skills li {
  padding: 0.6rem 0.9rem;
  background: var(--muted);
  border: 1px solid var(--border-color);
  border-radius: 0.6rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: transform var(--transition), border-color var(--transition), color var(--transition);
}

.skills li:hover,
.skills li:focus-visible {
  border-color: var(--accent);
  transform: translateY(-3px) scale(var(--hover-scale));
  color: var(--accent);
}

.about__media {
  margin: 0;
  align-self: start;
  padding: 1.2rem;
  border-radius: 1.2rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
  background: linear-gradient(135deg, rgba(66, 255, 179, 0.18), rgba(148, 102, 255, 0.12));
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.about__media::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(66, 255, 179, 0.28);
  transform: scale(0.96);
  opacity: 0.65;
  transition: transform var(--transition), opacity var(--transition);
}

.about__media:hover::before,
.about__media:focus-within::before {
  transform: scale(1.03);
  opacity: 1;
}

.about__media img {
  border-radius: 0.9rem;
}

.about__media:hover img,
.about__media:focus-within img {
  filter: saturate(1.1);
  transform: scale(1.03);
}

.about__media figcaption {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.projects {
  display: grid;
  gap: 1.5rem;
}

.project-card {
  position: relative;
  background: rgba(10, 14, 24, 0.85);
  border: 1px solid var(--muted);
  border-radius: 1.2rem;
  padding: 2.1rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(66, 255, 179, 0.12), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
}

.project-card:hover,
.project-card:focus-within {
  transform: translateY(-6px) scale(var(--hover-scale-card));
  border-color: var(--accent-soft);
  box-shadow: 0 32px 50px rgba(0, 0, 0, 0.4);
}

.project-card:hover::before,
.project-card:focus-within::before {
  opacity: 1;
}

.project-card__meta {
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.project-card__title {
  font-size: 1.6rem;
  margin: 1rem 0;
}

.project-card__description {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.project-card__footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.9rem;
}

.project-card__stack {
  color: rgba(247, 249, 252, 0.6);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--accent);
  font-weight: 500;
  position: relative;
  transition: color var(--transition), transform var(--transition);
}

.link-arrow::after {
  content: '→';
  font-size: 0.95rem;
  transition: transform var(--transition);
}

.link-arrow:hover,
.link-arrow:focus-visible {
  color: var(--accent-strong);
  transform: translateX(3px);
}

.link-arrow:hover::after,
.link-arrow:focus-visible::after {
  transform: translateX(5px);
}

.blog {
  display: grid;
  gap: 1.5rem;
}

.blog-card {
  padding: 1.9rem;
  border-radius: 1.1rem;
  border: 1px solid var(--muted);
  background: rgba(8, 11, 20, 0.9);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.blog-card:hover,
.blog-card:focus-within {
  transform: translateY(-6px) scale(var(--hover-scale-card));
  border-color: var(--accent-soft);
  box-shadow: 0 25px 40px rgba(0, 0, 0, 0.35);
}

.blog-card__date {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(247, 249, 252, 0.5);
}

.blog-card__title {
  font-size: 1.4rem;
  margin: 1rem 0;
  font-family: 'Space Grotesk', 'Inter', sans-serif;
}

.blog-card__excerpt {
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
}

.blog__fullpapers {
  margin-top: 2.5rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--muted);
}

.blog__fullpapers h3 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  font-family: 'Space Grotesk', 'Inter', sans-serif;
}

.blog__fullpapers ul {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.75rem;
}

.blog__fullpapers a {
  color: var(--accent);
  transition: color var(--transition);
}

.blog__fullpapers a:hover,
.blog__fullpapers a:focus-visible {
  color: var(--accent-strong);
}

.section--contact {
  padding-bottom: 8rem;
}

.contact {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact__copy h3 {
  font-size: 2rem;
  margin: 0 0 1rem;
  font-family: 'Space Grotesk', 'Inter', sans-serif;
}

.contact__copy p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.contact__links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

.contact__links a {
  transition: color var(--transition), transform var(--transition);
}

.contact__links a:hover,
.contact__links a:focus-visible {
  color: var(--accent);
  transform: translateX(4px) scale(var(--hover-scale));
}

.contact__form {
  padding: 2.2rem;
  border-radius: 1.2rem;
  background: rgba(8, 11, 20, 0.95);
  border: 1px solid var(--muted);
  box-shadow: var(--shadow);
  display: grid;
  gap: 1.2rem;
}

.form-field {
  display: grid;
  gap: 0.5rem;
}

.form-field label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.form-field input,
.form-field textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  font: inherit;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
  outline: none;
}

.form-footnote {
  font-size: 0.85rem;
  color: rgba(247, 249, 252, 0.6);
}

.form-footnote a {
  color: var(--accent);
  transition: color var(--transition);
}

.form-footnote a:hover,
.form-footnote a:focus-visible {
  color: var(--accent-strong);
}

.form-status {
  font-size: 0.85rem;
  color: rgba(247, 249, 252, 0.6);
  min-height: 1.2rem;
}

.form-status--success {
  color: var(--accent);
}

.form-status--error {
  color: #ff8383;
}

.site-footer {
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--muted);
  text-align: center;
  color: rgba(247, 249, 252, 0.55);
  font-size: 0.9rem;
}

.post-header {
  padding: 8rem 0 4rem;
  background: radial-gradient(circle at 15% 25%, rgba(66, 255, 179, 0.1), transparent 45%),
    radial-gradient(circle at 75% 20%, rgba(148, 102, 255, 0.12), transparent 40%);
}

.post-header__meta {
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 0.8rem;
  color: rgba(247, 249, 252, 0.55);
  margin-bottom: 1.2rem;
}

.post-header__title {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  max-width: 780px;
  margin: 0;
}

.post-header__tags {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.post-tag {
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  background: rgba(66, 255, 179, 0.12);
  border: 1px solid rgba(66, 255, 179, 0.35);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.post-body {
  padding: 0 0 6rem;
}

.post-content {
  width: min(800px, 92vw);
  margin: 0 auto;
  display: grid;
  gap: 1.5rem;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.post-content h2 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  color: var(--text-primary);
  margin-top: 3rem;
  margin-bottom: 1rem;
  font-size: 1.9rem;
}

.post-content h3 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  color: var(--text-primary);
  margin-top: 2.4rem;
  margin-bottom: 0.8rem;
  font-size: 1.5rem;
}

.post-content ul,
.post-content ol {
  margin: 0;
  padding-left: 1.4rem;
  display: grid;
  gap: 0.6rem;
}

.post-content strong {
  color: var(--text-primary);
}

.post-footer {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--muted);
  text-align: center;
  color: rgba(247, 249, 252, 0.55);
}

.post-footer a {
  color: var(--accent);
  transition: color var(--transition);
}

.post-footer a:hover,
.post-footer a:focus-visible {
  color: var(--accent-strong);
}

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

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.animation-ready [data-animate] {
  opacity: 0;
  transition: transform 0.85s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.85s ease;
  transition-delay: calc(var(--delay-index, 0) * var(--delay-unit));
}

.animation-ready [data-animate*='fade-in'] {
  opacity: 0;
}

.animation-ready [data-animate*='slide-up'] {
  transform: translateY(42px);
}

.animation-ready [data-animate*='slide-down'] {
  transform: translateY(-42px);
}

.animation-ready [data-animate*='slide-in-left'] {
  transform: translateX(-42px);
}

.animation-ready [data-animate*='slide-in-right'] {
  transform: translateX(42px);
}

.animation-ready [data-animate*='bounce'] .hero__indicator-arrow::after {
  animation-play-state: paused;
}

.animation-ready [data-animate].is-visible {
  opacity: 1;
  transform: none;
}

.animation-ready [data-animate].is-visible .hero__indicator-arrow::after {
  animation-play-state: running;
}

@keyframes arrow-bounce {
  0%,
  100% {
    transform: translate(-50%, 0) rotate(-45deg);
    opacity: 0;
  }
  40% {
    opacity: 1;
  }
  50% {
    transform: translate(-50%, 16px) rotate(-45deg);
    opacity: 1;
  }
  60% {
    opacity: 0;
  }
}

@media (max-width: 900px) {
  .about {
    grid-template-columns: 1fr;
  }

  .contact {
    grid-template-columns: 1fr;
  }
}

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

  .nav__toggle {
    display: block;
  }

  .nav__links {
    position: absolute;
    top: 64px;
    right: 1rem;
    background: rgba(5, 7, 15, 0.95);
    border-radius: 0.9rem;
    border: 1px solid var(--muted);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    min-width: 220px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity var(--transition), transform var(--transition);
  }

  .nav__links[aria-hidden='false'] {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav__links li {
    width: 100%;
    text-align: right;
  }

  .hero {
    padding-top: 7.5rem;
  }

  .hero__actions {
    width: 100%;
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 540px) {
  .section__header {
    flex-direction: column;
    align-items: flex-start;
  }

  .section__line {
    width: 100%;
  }
}

.video-embed {
  position: relative;
  width: min(840px, 92vw);
  margin: 2.5rem auto;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 25px 40px rgba(0, 0, 0, 0.35);
}

.video-embed::before {
  content: '';
  display: block;
  padding-top: 56.25%;
}

.video-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.document-embed {
  width: min(900px, 94vw);
  margin: 3rem auto;
  border-radius: 1.2rem;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 30px 50px rgba(0, 0, 0, 0.35);
  background: rgba(8, 11, 20, 0.9);
}

.document-embed iframe {
  width: 100%;
  height: clamp(480px, 70vh, 920px);
  border: none;
  background: transparent;
}