:root {
  color-scheme: light;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f8fafc;
  color: #0f172a;
  font-size: 16px;
  line-height: 1.6;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent-2: #8b5cf6;
  --accent-3: #14b8a6;
  --surface: rgba(255, 255, 255, 0.9);
  --text: #0f172a;
  --muted: #475569;
  --border: rgba(148, 163, 184, 0.24);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.16), transparent 28%),
    radial-gradient(circle at 80% 0%, rgba(139, 92, 246, 0.16), transparent 24%),
    linear-gradient(135deg, #f8fbff 0%, #f8fafc 50%, #eef4ff 100%);
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(120deg, rgba(255,255,255,0.35), transparent 45%, rgba(37,99,235,0.08));
  mix-blend-mode: screen;
  animation: drift 18s ease-in-out infinite alternate;
}

body::after {
  content: '';
  position: fixed;
  inset: -10%;
  pointer-events: none;
  background:
    radial-gradient(circle at 20% 20%, rgba(20, 184, 166, 0.15), transparent 24%),
    radial-gradient(circle at 80% 10%, rgba(139, 92, 246, 0.16), transparent 26%),
    radial-gradient(circle at 50% 100%, rgba(37, 99, 235, 0.12), transparent 28%);
  filter: blur(24px);
  animation: pulseGlow 14s ease-in-out infinite;
  z-index: -1;
}

body > * {
  position: relative;
  z-index: 1;
}

.page-loader {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  gap: 1rem;
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.96), rgba(2, 6, 23, 0.98));
  color: white;
  transition: opacity 500ms ease, visibility 500ms ease;
}

.page-loader.is-hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-ring {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 50%;
  border: 3px solid rgba(255,255,255,0.16);
  border-top-color: #38bdf8;
  border-right-color: #818cf8;
  animation: spin 0.95s linear infinite;
  box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.2);
}

.loader-text {
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.86);
}

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

a {
  color: var(--primary-dark);
  text-decoration: none;
  transition: color 180ms ease, transform 180ms ease;
}

a:hover {
  color: var(--primary);
}

button,
input,
textarea {
  font: inherit;
}

.container {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);
  box-shadow: 0 10px 40px rgba(15, 23, 42, 0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  font-size: 1.05rem;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.6rem;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  padding: 0.6rem 0.8rem;
  border-radius: 999px;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary-dark);
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 0.2rem;
  background: #334155;
  border-radius: 999px;
}

.hero-section {
  padding: 4.5rem 0 3rem;
  position: relative;
  overflow: hidden;
}

.ambient-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(18px);
  opacity: 0.72;
  animation: float 10s ease-in-out infinite;
}

.orb-one {
  width: 240px;
  height: 240px;
  top: -4rem;
  right: -3rem;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.24), transparent 72%);
}

.orb-two {
  width: 180px;
  height: 180px;
  left: -2.5rem;
  bottom: 2rem;
  background: radial-gradient(circle, rgba(20, 184, 166, 0.2), transparent 72%);
  animation-duration: 12s;
}

.orb-three {
  width: 120px;
  height: 120px;
  top: 12rem;
  left: 40%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.22), transparent 72%);
  animation-duration: 8s;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.95fr;
  gap: 2rem;
  align-items: start;
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 4vw, 3.65rem);
  margin: 0;
  line-height: 1.02;
  letter-spacing: -0.03em;
  text-shadow: 0 8px 30px rgba(15, 23, 42, 0.08);
}

.hero-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.hero-pill {
  display: inline-flex;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(37, 99, 235, 0.16);
  color: var(--primary-dark);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.08);
  animation: drift 6s ease-in-out infinite;
}

.hero-pill:nth-child(2) {
  animation-delay: -1.6s;
}

.hero-pill:nth-child(3) {
  animation-delay: -3.2s;
}

.eyebrow {
  display: inline-flex;
  margin-bottom: 1rem;
  font-weight: 700;
  color: var(--primary-dark);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

.hero-description {
  margin: 1.1rem 0 1.4rem;
  max-width: 46rem;
  color: var(--muted);
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
}

.hero-actions .button {
  position: relative;
  overflow: hidden;
}

.hero-actions .button::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,0.28), transparent);
  transform: translateX(-120%);
  transition: transform 500ms ease;
}

.hero-actions .button:hover::after {
  transform: translateX(120%);
}

.contact-links {
  display: grid;
  gap: 0.55rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.contact-links a {
  font-weight: 600;
  position: relative;
  display: inline-block;
  padding-bottom: 0.08rem;
}

.contact-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--primary-dark), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 240ms ease;
}

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

.hero-panel {
  display: grid;
  gap: 1rem;
}

.panel-card,
.contact-card,
.skill-card,
.timeline-card,
.info-card,
.award-card,
.publication-card,
.conference-card,
.net-card,
.language-card,
.profile-card {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  padding: 1.4rem;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.06);
  backdrop-filter: blur(10px);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.panel-card::before,
.contact-card::before,
.skill-card::before,
.timeline-card::before,
.info-card::before,
.award-card::before,
.publication-card::before,
.conference-card::before,
.net-card::before,
.language-card::before,
.profile-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.45), transparent 45%);
  pointer-events: none;
}

.panel-card:hover,
.contact-card:hover,
.skill-card:hover,
.timeline-card:hover,
.info-card:hover,
.award-card:hover,
.publication-card:hover,
.conference-card:hover,
.net-card:hover,
.language-card:hover,
.profile-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 60px rgba(15, 23, 42, 0.1);
  border-color: rgba(37, 99, 235, 0.18);
}

.panel-card h2,
.section-heading h2,
.timeline-card h3,
.award-card h3,
.skill-card h3,
.conference-card h3,
.publication-card h3,
.contact-card h3 {
  margin-top: 0;
  margin-bottom: 0.8rem;
  font-size: 1.18rem;
  color: #0f172a;
}

.profile-visual-card {
  display: grid;
  gap: 1rem;
  align-items: center;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(255,255,255,0.95));
}

.profile-photo-shell {
  position: relative;
  width: min(210px, 100%);
  aspect-ratio: 1;
  margin: 0 auto;
  border-radius: 50%;
  padding: 0.35rem;
  background: linear-gradient(135deg, #2563eb, #60a5fa);
  box-shadow: 0 16px 36px rgba(37, 99, 235, 0.25);
  animation: float 5.5s ease-in-out infinite;
}

.profile-photo-shell::after {
  content: '';
  position: absolute;
  inset: 0.2rem;
  border: 2px solid rgba(255, 255, 255, 0.7);
  border-radius: 50%;
  pointer-events: none;
}

.profile-photo,
.profile-photo-fallback {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.profile-photo-fallback {
  display: none;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1d4ed8, #38bdf8);
  color: white;
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.profile-photo-shell.fallback-visible .profile-photo-fallback {
  display: flex;
}

.profile-photo-caption {
  text-align: center;
}

.profile-photo-caption p {
  margin: 0;
  color: var(--muted);
}

.hero-feature-card {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(255,255,255,0.95));
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--primary-dark);
  font-size: 1.1rem;
  margin-bottom: 0.8rem;
  animation: pulseIcon 3.6s ease-in-out infinite;
}

.feature-list {
  margin: 0;
  padding-left: 1rem;
  color: var(--muted);
}

.feature-list li + li {
  margin-top: 0.35rem;
}

.tags-grid,
.tag-list,
.profile-links {
  display: grid;
  gap: 0.65rem;
}

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

.tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 0.85rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.08);
  color: var(--primary-dark);
  font-size: 0.86rem;
  font-weight: 600;
}

.stats-card {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.stat-item {
  padding: 1rem;
  border-radius: 1rem;
  background: linear-gradient(145deg, #f8fbff, #eff6ff);
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary-dark);
}

.stat-label {
  color: var(--muted);
  font-size: 0.92rem;
}

.section {
  padding: 3rem 0;
  position: relative;
  overflow: hidden;
}

.section::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  width: min(780px, 85%);
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.24), transparent);
  opacity: 0.8;
}

.section[data-theme="physics"] {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.035), rgba(20, 184, 166, 0.025));
  border-radius: 1.8rem;
  padding-inline: 1rem;
}

.section[data-theme="tech"] {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.04), rgba(37, 99, 235, 0.03));
  border-radius: 1.8rem;
  padding-inline: 1rem;
}

.section:first-of-type::before {
  display: none;
}

.section-heading {
  max-width: 58rem;
  margin-bottom: 1.3rem;
}

.section-heading p {
  margin: 0.65rem 0 0;
  color: var(--muted);
}

.section-subheading {
  margin: 1.2rem 0 0.7rem;
  font-weight: 700;
  color: #0f172a;
}

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

.grid-3,
.grid-4,
.grid-2,
.timeline-grid,
.contact-grid {
  display: grid;
  gap: 1rem;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

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

.timeline-card header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.8rem;
}

.timeline-card header h3,
.timeline-card header .tag {
  margin: 0;
}

.timeline-card .tag {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.08);
  color: var(--primary-dark);
  font-size: 0.82rem;
  font-weight: 700;
}

.meta {
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 0.9rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-list span {
  font-size: 0.82rem;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  background: #f1f5f9;
  color: #334155;
}

.award-card {
  padding: 1.4rem;
}

.award-card.highlight {
  border-color: rgba(250, 204, 21, 0.45);
  background: linear-gradient(135deg, #fffbea, #fffbeb);
}

.award-card span {
  display: inline-flex;
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.net-qualifications {
  margin-top: 1.4rem;
}

.net-card {
  padding: 1.25rem;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(255,255,255,0.95));
  border-color: rgba(96, 165, 250, 0.35);
}

.net-card strong {
  display: block;
  font-size: 1.3rem;
  color: var(--primary-dark);
}

.net-card p,
.net-card span {
  margin: 0.25rem 0 0;
  color: var(--muted);
}

.note {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.publication-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.publication-card {
  padding: 1.4rem;
}

.publication-meta {
  margin: 0.75rem 0 0.75rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.publication-card a {
  font-size: 0.92rem;
  font-weight: 600;
}

.patent-card {
  border-color: rgba(34, 197, 94, 0.3);
  background: linear-gradient(135deg, rgba(236, 253, 245, 0.95), rgba(255,255,255,0.95));
}

.conference-card ul,
.skill-card .tag-list {
  margin: 0;
  padding-left: 1.1rem;
}

.conference-card li {
  margin-bottom: 0.65rem;
  color: var(--muted);
  line-height: 1.7;
}

.skill-card h3 {
  margin-bottom: 1rem;
}

.skill-card .tag-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.profile-card {
  display: grid;
  gap: 0.35rem;
}

.profile-card strong {
  color: #0f172a;
}

.profile-card span {
  color: var(--muted);
  font-size: 0.95rem;
}

.language-card {
  padding: 1rem;
  text-align: center;
}

.language-card strong {
  display: block;
  margin-bottom: 0.4rem;
  color: #0f172a;
}

.language-card span {
  color: var(--muted);
}

.contact-grid {
  grid-template-columns: 1.1fr 0.9fr;
}

.contact-card h3 {
  margin-bottom: 1rem;
}

.contact-item {
  margin-bottom: 1rem;
}

.contact-item strong {
  display: block;
  margin-bottom: 0.35rem;
  color: #0f172a;
}

.contact-item a {
  display: inline-block;
  color: var(--primary-dark);
}

.profile-links {
  display: grid;
  gap: 0.5rem;
}

.profile-links a {
  color: var(--primary-dark);
}

.contact-form {
  display: grid;
  gap: 1rem;
  padding: 1.4rem;
}

.form-row {
  display: grid;
  gap: 0.45rem;
}

.form-row label {
  font-size: 0.95rem;
  color: #334155;
}

input[type='text'],
input[type='email'],
textarea {
  width: 100%;
  min-height: 3rem;
  padding: 0.95rem 1rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.9rem;
  background: #ffffff;
  color: #0f172a;
}

textarea {
  min-height: 140px;
  resize: vertical;
}

input:focus,
textarea:focus {
  outline: 2px solid rgba(37, 99, 235, 0.14);
  border-color: var(--primary);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.2rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #ffffff;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.28);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.85);
  color: var(--primary-dark);
  border: 1px solid rgba(37, 99, 235, 0.18);
}

.form-status {
  min-height: 2rem;
  color: #155e75;
  font-size: 0.95rem;
}

.reveal {
  opacity: 0;
  transform: translateY(24px) scale(0.985);
  transition: opacity 700ms ease, transform 700ms ease;
}

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

.site-footer {
  padding: 2.2rem 0 2.4rem;
  background: linear-gradient(135deg, #0f172a, #111827);
  color: #cbd5e1;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  text-align: center;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(0, -10px, 0) scale(1.03);
  }
}

@keyframes pulseIcon {
  0%,
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.14);
  }
  50% {
    transform: scale(1.06);
    box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.06);
  }
}

@keyframes drift {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

@keyframes pulseGlow {
  0%,
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 0.85;
  }
  50% {
    transform: scale(1.05) rotate(2deg);
    opacity: 1;
  }
}

@media (max-width: 980px) {
  .hero-grid,
  .grid-3,
  .grid-4,
  .grid-2,
  .timeline-grid,
  .contact-grid,
  .skill-card .tag-list {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .hero-section {
    padding-top: 3rem;
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    width: 100%;
    flex-direction: column;
    display: none;
    gap: 0.75rem;
    margin-top: 1rem;
    padding-bottom: 1rem;
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    width: 100%;
    padding: 0.8rem 0.85rem;
    background: rgba(255,255,255,0.9);
    border-radius: 0.9rem;
  }
}

@media (max-width: 520px) {
  .section {
    padding: 2rem 0;
  }

  .panel-card,
  .contact-card,
  .timeline-card,
  .skill-card,
  .info-card,
  .award-card,
  .publication-card,
  .conference-card,
  .net-card,
  .language-card,
  .profile-card {
    padding: 1.2rem;
  }

  .button {
    width: 100%;
  }
}