:root {
  --bg: #f5f7fa;
  --bg-elevated: #fbfcfe;
  --text-main: #17222f;
  --text-muted: #4d5b6d;
  --line: #d7dee8;
  --accent: #0b3b72;
  --accent-soft: #e8eff9;
  --radius: 16px;
  --shadow: 0 16px 40px rgba(12, 32, 56, 0.08);
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Manrope", "Segoe UI", Tahoma, sans-serif;
  color: var(--text-main);
  background: var(--bg);
  line-height: 1.6;
}

.ambient-layer {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 10% 8%, rgba(11, 59, 114, 0.12), transparent 34%),
    radial-gradient(circle at 88% 18%, rgba(32, 70, 109, 0.1), transparent 30%),
    linear-gradient(180deg, #f8fafd 0%, #f4f7fb 42%, #f8fafd 100%);
}

.ambient-layer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(23, 34, 47, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23, 34, 47, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, black 15%, rgba(0, 0, 0, 0.2));
  pointer-events: none;
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
}

.site-header {
  width: min(100% - 2rem, var(--max-width));
  margin: 1rem auto 0;
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: sticky;
  top: 0.8rem;
  backdrop-filter: blur(8px);
  background: rgba(248, 250, 253, 0.84);
  border: 1px solid rgba(215, 222, 232, 0.85);
  border-radius: 999px;
  z-index: 20;
}

.brand {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  color: var(--accent);
  font-family: "Fraunces", Georgia, serif;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.03em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  position: relative;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.3rem;
  height: 2px;
  border-radius: 999px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 180ms ease;
}

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

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
}

.hero {
  padding: 7.5rem 0 4.5rem;
}

.page-main {
  padding-top: 2rem;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(200px, 24vw, 270px);
  align-items: start;
  gap: clamp(1.2rem, 2.8vw, 2.4rem);
}

.hero-content {
  min-width: 0;
}

.eyebrow {
  margin: 0;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: #4f6a87;
  font-weight: 700;
}

h1,
h2,
h3 {
  font-family: "Fraunces", Georgia, serif;
  line-height: 1.25;
  margin: 0;
}

h1 {
  margin-top: 0.65rem;
  font-size: clamp(2.3rem, 5.4vw, 4rem);
  max-width: 15ch;
}

.hero-copy {
  margin: 1.3rem 0 0;
  color: var(--text-muted);
  font-size: clamp(1.02rem, 2.2vw, 1.2rem);
  max-width: 60ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.72rem 1.2rem;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease,
    color 160ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-solid {
  background: linear-gradient(135deg, #0e3560, #155091);
  color: #f5f8fd;
  box-shadow: 0 9px 24px rgba(17, 67, 124, 0.26);
}

.btn-solid:hover {
  box-shadow: 0 12px 28px rgba(17, 67, 124, 0.35);
}

.btn-outline {
  border: 1px solid var(--line);
  color: var(--text-main);
  background: rgba(251, 252, 254, 0.85);
}

.btn-outline:hover {
  background: #ffffff;
}

.highlights {
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.highlights li {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  font-size: 0.84rem;
  color: #37526f;
  background: rgba(250, 252, 255, 0.88);
}

.hero-photo-card {
  width: 100%;
  margin: 0;
  padding: 0.52rem;
  border: 1px solid #d8e1ee;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(244, 248, 254, 0.9));
  box-shadow: 0 14px 30px rgba(12, 32, 56, 0.12);
}

.hero-photo {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center 18%;
  border-radius: 13px;
}

.hero-photo-card figcaption {
  margin-top: 0.42rem;
  text-align: center;
  font-size: 0.78rem;
  color: #536982;
}

.section {
  padding: 1.25rem 0 2.75rem;
}

.section-head {
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.55rem, 3.1vw, 2.2rem);
  margin-top: 0.4rem;
}

h3 {
  font-size: 1.22rem;
}

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

.stack {
  display: grid;
  gap: 1rem;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.3rem;
}

.card ul,
.card ol {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
}

.card li {
  margin: 0.38rem 0;
  color: var(--text-muted);
}

.timeline {
  list-style: none;
  padding: 0;
}

.timeline > li {
  padding: 0.5rem 0 0.8rem;
  border-bottom: 1px dashed rgba(125, 145, 170, 0.32);
}

.timeline > li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.timeline p {
  margin: 0.28rem 0 0;
  color: var(--text-muted);
}

.item-top {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 0.8rem;
}

.item-top span {
  font-size: 0.82rem;
  white-space: nowrap;
  color: #4f627b;
  background: var(--accent-soft);
  border: 1px solid #d0ddef;
  border-radius: 999px;
  padding: 0.26rem 0.52rem;
}

.org {
  margin: 0.4rem 0 0;
  color: #3f5a79;
  font-weight: 600;
}

.pub-list {
  margin-top: 0.9rem;
}

.pub-list p {
  margin: 0.18rem 0 0.32rem;
  color: #4b5d74;
  font-size: 0.95rem;
}

.pub-authors {
  margin-top: 0.35rem;
  color: #31475f;
  font-size: 0.92rem;
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem 0.9rem;
  list-style: none;
  padding: 0;
}

.skill-grid li {
  padding: 0.5rem 0.68rem;
  border: 1px solid #d4dce8;
  border-radius: 10px;
  margin: 0;
  background: #fcfdff;
}

.lang {
  margin-top: 1rem;
  color: var(--text-muted);
}

.contact-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.contact-card p {
  margin: 0.25rem 0 0;
  color: var(--text-muted);
}

.site-footer {
  width: min(100% - 2rem, var(--max-width));
  margin: 1.2rem auto 2.2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0;
  color: #54657a;
  font-size: 0.89rem;
}

.reveal {
  opacity: 1;
  transform: translateY(0);
  transition: none;
}

@media (max-width: 980px) {
  .site-nav {
    display: none;
  }

  .hero {
    padding-top: 6.6rem;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .hero-photo-card {
    width: min(100%, 240px);
    margin: 0 auto;
    order: -1;
  }

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

@media (max-width: 680px) {
  .site-header {
    margin-top: 0.72rem;
    padding: 0.7rem 0.85rem;
  }

  .brand {
    width: 38px;
    height: 38px;
  }

  .btn {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-photo-card {
    width: min(100%, 196px);
    padding: 0.4rem;
    border-radius: 15px;
  }

  .hero-photo-card figcaption {
    font-size: 0.72rem;
  }

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

  .section {
    padding-bottom: 2.1rem;
  }
}