::selection {
  background: rgba(82, 169, 255, 0.28);
}

:root {
  --bg: #091521;
  --bg-soft: #0f2336;
  --surface: rgba(9, 22, 33, 0.76);
  --surface-strong: rgba(17, 35, 52, 0.92);
  --panel: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.09);
  --text: #eff5fb;
  --muted: #97aeca;
  --blue: #60c3ff;
  --blue-deep: #0f6da9;
  --gold: #ffbf66;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  --radius-xl: 32px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --content-width: min(1200px, calc(100vw - 48px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(84, 175, 255, 0.2), transparent 24rem),
    radial-gradient(circle at 90% 14%, rgba(255, 191, 102, 0.16), transparent 24rem),
    linear-gradient(180deg, #0a1420 0%, #0b1624 50%, #09131d 100%);
  font-family: "Space Grotesk", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
}

.bg-orb {
  position: fixed;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.2;
  pointer-events: none;
  z-index: 0;
}

.orb-a {
  top: -8rem;
  left: -8rem;
  background: #2ea6ff;
}

.orb-b {
  bottom: -10rem;
  right: -6rem;
  background: #ff9a3c;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 38px 38px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 80%);
  pointer-events: none;
  z-index: 0;
}

.topbar {
  width: var(--content-width);
  margin: 20px auto 0;
  padding: 16px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 12px;
  z-index: 20;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(8, 18, 28, 0.72);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.03em;
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: inline-grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--gold), #f97943);
  color: #101318;
}

.nav {
  display: flex;
  gap: 20px;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.96rem;
}

.nav a:hover,
.nav a.active {
  color: var(--text);
}

.page-shell {
  position: relative;
  z-index: 1;
  width: var(--content-width);
  margin: 22px auto 60px;
}

.section {
  margin-top: 26px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(12, 24, 38, 0.85), rgba(8, 18, 28, 0.9));
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 34px;
  align-items: center;
  min-height: 540px;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 18%, rgba(96, 195, 255, 0.18), transparent 28rem),
    linear-gradient(135deg, rgba(96, 195, 255, 0.08), transparent 35%);
  pointer-events: none;
}

.hero-copy,
.hero-panel {
  position: relative;
  z-index: 1;
}

.eyebrow,
.section-heading p,
.contact-kicker {
  color: var(--blue);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.82rem;
  margin: 0 0 10px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3rem, 8vw, 5.2rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.hero h1 span {
  display: block;
  margin-top: 8px;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  color: var(--muted);
  letter-spacing: 0;
}

.hero-summary {
  max-width: 46rem;
  margin: 22px 0 0;
  color: #d7e5f6;
  font-size: 1.08rem;
  line-height: 1.9;
}

.hero-tags,
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-tags {
  margin-top: 24px;
}

.hero-tags span,
.chip-list span,
.chip-list li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: #d9e8f8;
  list-style: none;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--blue), #2992dc);
  color: #06131f;
  box-shadow: 0 16px 30px rgba(42, 146, 220, 0.32);
}

.btn-secondary {
  background: linear-gradient(135deg, rgba(255, 191, 102, 0.9), rgba(255, 146, 52, 0.9));
  color: #20150b;
}

.btn-ghost {
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 30px 0 0;
}

.hero-metrics div {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-metrics dt {
  margin: 0 0 10px;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--gold);
}

.hero-metrics dd {
  margin: 0;
  color: #d7e5f6;
  line-height: 1.6;
}

.hero-panel {
  display: grid;
  gap: 20px;
  align-self: stretch;
}

.portrait-frame {
  position: relative;
  min-height: 420px;
  padding: 18px;
  border-radius: 30px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

.portrait-frame::before {
  content: "";
  position: absolute;
  inset: auto -4rem -5rem auto;
  width: 14rem;
  height: 14rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 191, 102, 0.3), transparent 70%);
}

.portrait-rim {
  position: absolute;
  inset: 18px;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  pointer-events: none;
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  min-height: 384px;
  object-fit: cover;
  object-position: center 24%;
  border-radius: 22px;
  display: block;
  filter: saturate(1.02) contrast(1.02);
}

.signal-card,
.feature-card,
.timeline-card,
.content-card,
.experience-card,
.contact-panel {
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.signal-card {
  padding: 24px;
}

.signal-title,
.content-card h3,
.feature-card h3,
.timeline-item h3,
.experience-card h3 {
  margin: 0 0 10px;
}

.signal-title {
  color: var(--gold);
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.signal-card ul,
.bullet-list {
  margin: 0;
  padding-left: 20px;
  line-height: 1.9;
  color: #d7e5f6;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  letter-spacing: -0.03em;
}

.strength-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.feature-card {
  padding: 24px;
}

.feature-card p,
.content-card p,
.timeline-item p,
.experience-card p {
  margin: 0;
  color: #d5e5f6;
  line-height: 1.85;
}

.feature-primary {
  background:
    linear-gradient(135deg, rgba(96, 195, 255, 0.2), rgba(18, 58, 88, 0.45)),
    rgba(255, 255, 255, 0.04);
}

.section-split .two-col {
  margin-top: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 18px;
}

.timeline-card,
.info-stack,
.research-grid,
.experience-list {
  display: grid;
  gap: 18px;
}

.timeline-card {
  padding: 26px;
  position: relative;
}

.timeline-card::before {
  content: "";
  position: absolute;
  left: 34px;
  top: 34px;
  bottom: 34px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue), rgba(255, 255, 255, 0.08));
}

.timeline-item {
  position: relative;
  padding-left: 44px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 26px;
  top: 7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 8px rgba(255, 191, 102, 0.12);
}

.timeline-item + .timeline-item {
  margin-top: 20px;
}

.timeline-year,
.experience-head span,
.card-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.86rem;
  color: #dbe8f8;
  background: rgba(255, 255, 255, 0.07);
}

.info-stack {
  align-content: start;
}

.content-card,
.experience-card {
  padding: 24px;
}

.coursework-card {
  margin-top: 18px;
}

.course-group + .course-group {
  margin-top: 20px;
}

.course-label {
  margin: 0 0 12px;
  color: var(--gold);
  font-weight: 700;
}

.research-grid {
  margin-top: 22px;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
}

.paper-title {
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.8;
}

.card-badge {
  margin-bottom: 14px;
  background: rgba(96, 195, 255, 0.15);
}

.card-badge.accent {
  background: rgba(255, 191, 102, 0.15);
}

.experience-list {
  margin-top: 18px;
}

.experience-head {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
  margin-bottom: 12px;
}

.experience-role {
  margin: 0 0 8px;
  color: var(--blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
}

.contact-panel {
  margin-top: 22px;
  padding: 28px;
  display: flex;
  justify-content: space-between;
  gap: 22px;
  align-items: center;
}

.contact-panel h3 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  max-width: 34rem;
}

.contact-list {
  display: grid;
  gap: 10px;
  min-width: min(360px, 100%);
}

.contact-list a,
.contact-list span {
  color: var(--text);
  text-decoration: none;
  padding: 12px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
}

.footer {
  position: relative;
  z-index: 1;
  width: var(--content-width);
  margin: 0 auto 34px;
  text-align: center;
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 720ms ease, transform 720ms ease;
}

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

@media (max-width: 1024px) {
  .hero,
  .strength-grid,
  .section-split .two-col,
  .research-grid,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .strength-grid {
    display: grid;
  }

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

  .contact-panel {
    display: grid;
  }
}

@media (max-width: 720px) {
  :root {
    --content-width: min(100vw - 24px, 100%);
  }

  .topbar {
    margin-top: 12px;
    padding: 14px 16px;
    border-radius: 24px;
    flex-direction: column;
    gap: 12px;
  }

  .nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
  }

  .section {
    padding: 22px;
    border-radius: 24px;
  }

  .hero {
    min-height: auto;
  }

  .hero-summary {
    font-size: 1rem;
  }

  .portrait-frame {
    min-height: 360px;
  }

  .experience-head {
    flex-direction: column;
  }
}