/* ---------- Root + Reset ---------- */

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

:root {
  --bg-gradient-start: #e4f0ff;
  --bg-gradient-end: #f5f7fb;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --text-main: #0f172a;
  --text-muted: #6b7280;
  --glass-bg: rgba(255, 255, 255, 0.16);
  --glass-border: rgba(255, 255, 255, 0.6);
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.18);
  --radius-lg: 22px;
  --radius-pill: 999px;
  --transition-fast: 180ms ease-out;
  --section-max-width: 1100px;
  --nav-height: 70px;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
}

/* ---------- Background "liquid glass" environment ---------- */

.background-layer {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 10% 20%, #cddbf4 0, transparent 50%),
    radial-gradient(circle at 80% 0, #b3c8ff 0, transparent 45%),
    radial-gradient(circle at 0 100%, #bce6ff 0, transparent 45%),
    linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  z-index: -2;
}

/* subtle noise overlay to make it feel softer */
.background-layer::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 160 160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='noStitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
  pointer-events: none;
}

/* ---------- Layout ---------- */

.page {
  max-width: var(--section-max-width);
  margin: 0 auto;
  padding: 100px 18px 60px;
}

.section {
  margin-bottom: 32px;
  padding: 24px 22px;
}

.section h2 {
  margin: 0 0 12px;
  font-size: 1.3rem;
}

/* ---------- Glass cards ---------- */

.glass-card {
  background: var(--glass-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.35),
    rgba(255, 255, 255, 0.05)
  );
  mix-blend-mode: soft-light;
  opacity: 0.8;
  pointer-events: none;
}

/* inner content layer so text isn't under ::before */

.glass-card > * {
  position: relative;
  z-index: 1;
}

/* ---------- Header & Nav ---------- */

.site-header {
  max-width: var(--section-max-width);
  margin: 14px auto 0;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  position: sticky;
  top: 10px;
  z-index: 20;
}

.site-title {
  font-size: 1.4rem;
  margin: 0;
}

.site-subtitle {
  margin: 2px 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  font-size: 0.85rem;
  text-decoration: none;
  border-radius: var(--radius-pill);
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(148, 163, 184, 0.5);
  transition: background var(--transition-fast), transform var(--transition-fast),
    box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.site-nav a:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.2);
}

.site-nav a.active {
  background: var(--accent);
  color: #f9fafb;
  border-color: transparent;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.35);
}

/* ---------- Profile / About ---------- */

.section--about {
  margin-top: 26px;
}

.profile {
  display: grid;
  grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
  gap: 20px;
  align-items: center;
}

.profile-photo-wrapper {
  display: flex;
  justify-content: center;
}

.profile-photo {
  width: 100%;
  max-width: 220px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 26px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.3);
  filter: saturate(1.02);
}

.profile-content .lead {
  font-size: 0.98rem;
  margin-bottom: 8px;
}

.profile-content p {
  margin-top: 0;
  color: var(--text-main);
}

.profile-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 8px 18px;
  margin: 12px 0;
}

.profile-meta dt {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.profile-meta dd {
  margin: 0;
  font-size: 0.88rem;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.7);
  color: var(--text-main);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast);
}

.chip:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.24);
  background: #ffffff;
}

/* ---------- Publications ---------- */

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.section-header h2 {
  margin-bottom: 0;
}

.pub-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.pub-controls select {
  font-size: 0.8rem;
  padding: 4px 8px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.9);
  background: rgba(255, 255, 255, 0.9);
}

.timeline {
  border-left: 1px solid rgba(148, 163, 184, 0.5);
  margin-left: 8px;
  padding-left: 16px;
}

.year-block {
  position: relative;
  padding-bottom: 12px;
  margin-bottom: 10px;
}

.year-block::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.4);
}

.year-heading {
  margin-left: 16px;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.pub-item {
  padding: 8px 10px;
  border-radius: 16px;
  transition: background var(--transition-fast), transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.pub-item:hover {
  background: rgba(255, 255, 255, 0.86);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.18);
}

.pub-tag {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-size: 0.7rem;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 4px;
}

.pub-title {
  margin: 2px 0;
  font-size: 0.92rem;
}

.pub-title em {
  font-style: italic;
}

.pub-meta {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- Interests ---------- */

.pill-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill-list li {
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.8);
}

/* ---------- Awards ---------- */

.awards-list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.awards-item {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 12px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(148, 163, 184, 0.7);
}

.awards-year {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.awards-content h3 {
  margin: 0 0 2px;
  font-size: 0.9rem;
}

.awards-content p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ---------- Contact ---------- */

.contact-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  font-size: 0.88rem;
}

.contact-list li {
  margin-bottom: 4px;
}

.contact-list span {
  font-weight: 600;
  margin-right: 8px;
}

.contact-list a {
  color: var(--accent);
  text-decoration: none;
}

.contact-list a:hover {
  text-decoration: underline;
}

/* ---------- Back to top button ---------- */

.to-top {
  position: fixed;
  right: 16px;
  bottom: 16px;
  width: 36px;
  height: 36px;
  border-radius: 999px;
  border: none;
  outline: none;
  background: rgba(37, 99, 235, 0.96);
  color: #f9fafb;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.5);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 30;
}

.to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ---------- Footer ---------- */

.site-footer {
  max-width: var(--section-max-width);
  margin: 0 auto 20px;
  padding: 8px 18px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- Reveal animation on scroll ---------- */

.section {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 260ms ease-out, transform 260ms ease-out;
}

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

/* ---------- Responsive tweaks ---------- */

@media (max-width: 800px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

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

@media (max-width: 500px) {
  .site-header {
    padding: 10px 14px;
  }

  .page {
    padding: 90px 12px 50px;
  }

  .section {
    padding: 20px 18px;
  }

  .site-nav ul {
    gap: 6px;
  }

  .site-nav a {
    padding: 5px 9px;
    font-size: 0.8rem;
  }
}