:root {
  --site-bg: #f1f4f7;
  --surface: #ffffff;
  --surface-muted: #f6f9fc;
  --border: #d5dee8;
  --text-strong: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --accent: #0f4f82;
  --accent-strong: #0b3f68;
  --accent-soft: rgba(15, 79, 130, 0.1);
  --shadow-soft: 0 14px 34px rgba(15, 23, 42, 0.08);
  --shadow-hover: 0 18px 42px rgba(15, 23, 42, 0.13);
  --radius-md: 14px;
  --radius-lg: 20px;
}

body.dark {
  --site-bg: #0f172a;
  --surface: #111b2f;
  --surface-muted: #15233a;
  --border: #243855;
  --text-strong: #e5edff;
  --text-body: #c7d5ed;
  --text-muted: #93a8c8;
  --accent: #8bbcff;
  --accent-strong: #d4e6ff;
  --accent-soft: rgba(139, 188, 255, 0.17);
  --shadow-soft: 0 16px 36px rgba(2, 6, 23, 0.44);
  --shadow-hover: 0 20px 44px rgba(2, 6, 23, 0.56);
}

.MathJax,
.MathJax_Display {
  overflow-x: auto !important;
  overflow-y: hidden !important;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--site-bg);
  background-image:
    radial-gradient(circle at 8% -15%, rgba(15, 79, 130, 0.16), transparent 45%),
    radial-gradient(circle at 102% 2%, rgba(37, 99, 172, 0.13), transparent 36%);
  color: var(--text-body);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  line-height: 1.64;
}

body.dark {
  background-image:
    radial-gradient(circle at 8% -15%, rgba(139, 188, 255, 0.16), transparent 42%),
    radial-gradient(circle at 102% 2%, rgba(70, 131, 210, 0.12), transparent 34%);
}

h1,
h2,
h3,
h4,
h5,
h6,
.navbar-brand {
  color: var(--text-strong);
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  font-weight: 500;
  letter-spacing: -0.01em;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

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

#navbar-main {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.05);
}

body.dark #navbar-main {
  background: rgba(17, 27, 47, 0.9);
}

#navbar-main .navbar-brand {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0;
}

#navbar-main .nav-link {
  color: var(--text-muted) !important;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0 0.18rem;
  padding: 0.55rem 0.62rem !important;
  position: relative;
  transition: color 0.22s ease;
}

#navbar-main .nav-link::after {
  background: var(--accent);
  border-radius: 999px;
  bottom: 0.26rem;
  content: "";
  height: 2px;
  left: 0.62rem;
  opacity: 0;
  position: absolute;
  right: 0.62rem;
  transform: scaleX(0.65);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

#navbar-main .nav-link:hover,
#navbar-main .nav-link.active,
#navbar-main .nav-link:focus {
  color: var(--text-strong) !important;
}

#navbar-main .nav-link:hover::after,
#navbar-main .nav-link.active::after,
#navbar-main .nav-link:focus::after {
  opacity: 1;
  transform: scaleX(1);
}

.home-section {
  animation: section-reveal 0.5s ease both;
  padding: 3.2rem 0;
}

@keyframes section-reveal {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.wg-about .container,
.wg-featured .container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: clamp(1.3rem, 2.6vw, 2.3rem);
}

.about-layout {
  align-items: flex-start;
  row-gap: 1.4rem;
}

.about-profile-card {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.45rem 1.25rem;
}

#profile .avatar {
  border: 4px solid var(--surface);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.16);
  display: block;
  height: auto;
  margin: 0 auto 1.2rem;
  max-width: 220px;
  width: 74%;
}

.portrait-title h2 {
  font-size: 1.55rem;
  margin-bottom: 0.35rem;
}

.portrait-title h3 {
  color: var(--text-muted);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 0.2rem;
}

.network-icon {
  display: flex;
  flex-wrap: wrap;
  gap: 0.52rem;
  justify-content: center;
  margin-top: 1.05rem;
}

.network-icon li {
  margin: 0;
}

.network-icon li a {
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  display: inline-flex;
  height: 2.2rem;
  justify-content: center;
  transition: all 0.2s ease;
  width: 2.2rem;
}

.network-icon li a:hover,
.network-icon li a:focus {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  transform: translateY(-1px);
}

.network-icon .big-icon {
  font-size: 1rem;
  line-height: 1;
}

.about-content-col > h1 {
  font-size: clamp(1.75rem, 3.1vw, 2.35rem);
  margin-bottom: 0.95rem;
}

.about-content-col .article-style {
  max-width: 72ch;
}

.about-content-col .article-style p + p {
  margin-top: 0.92rem;
}

.about-secondary-grid {
  margin-top: 1.35rem;
}

.about-secondary-card {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  height: 100%;
  padding: 1rem 1.05rem;
}

.about-secondary-card .section-subheading {
  color: var(--text-muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.ul-interests li,
.ul-edu li {
  margin-bottom: 0.55rem;
}

.ul-edu .course {
  color: var(--text-strong);
  font-weight: 600;
  margin-bottom: 0.1rem;
}

.ul-edu .institution {
  color: var(--text-body);
  margin-bottom: 0.2rem;
}

.section-heading h1 {
  font-size: clamp(1.5rem, 2.7vw, 2rem);
}

.alert-note {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-body);
  margin-bottom: 1rem;
}

.alert-note > div {
  color: var(--text-body);
}

#container-publications .isotope-item {
  padding-left: 0;
  padding-right: 0;
}

.card-simple,
.compact-item-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.07);
  margin-bottom: 0.95rem;
  padding: 1.1rem 1.15rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.card-simple:hover,
.compact-item-card:hover {
  border-color: rgba(15, 79, 130, 0.4);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.compact-item-title {
  color: var(--text-strong);
  display: block;
  font-size: 1.07rem;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 0.55rem;
}

.compact-item-title:hover,
.compact-item-title:focus {
  color: var(--accent-strong);
  text-decoration: none;
}

.item-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.56rem;
}

.item-tag {
  background: var(--accent-soft);
  border: 1px solid rgba(15, 79, 130, 0.24);
  border-radius: 999px;
  color: var(--accent-strong);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 0.19rem 0.52rem;
  white-space: nowrap;
}

.item-meta.article-metadata {
  color: var(--text-muted);
  font-size: 0.88rem;
  letter-spacing: 0.01em;
  margin-bottom: 0.5rem;
}

.item-meta.article-metadata a {
  color: var(--text-muted);
}

.item-meta.article-metadata a:hover {
  color: var(--accent);
}

.item-venue {
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.venue-badge {
  align-items: center;
  background: var(--accent);
  border-radius: 999px;
  color: #ffffff;
  display: inline-flex;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.18rem 0.55rem;
}

.item-venue-text {
  color: var(--text-body);
  font-size: 0.9rem;
}

.btn-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.65rem;
}

.btn.btn-outline-primary.btn-page-header,
.btn.btn-outline-primary.btn-page-header.btn-sm {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: none;
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.2;
  padding: 0.24rem 0.64rem;
}

.btn.btn-outline-primary.btn-page-header:hover,
.btn.btn-outline-primary.btn-page-header:focus {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.form-row.mb-4 {
  align-items: center;
  margin-bottom: 1.2rem !important;
}

.filter-search,
.pub-filters.form-control {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: none;
  color: var(--text-body);
  font-size: 0.88rem;
  height: 2.3rem;
  padding: 0.35rem 0.92rem;
}

.filter-search {
  min-width: 220px;
}

.filter-search:focus,
.pub-filters.form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 0.16rem rgba(15, 79, 130, 0.16);
}

.article-metadata {
  color: var(--text-muted);
  font-size: 0.88rem;
  letter-spacing: 0.01em;
  margin-bottom: 0.55rem;
  overflow: hidden;
}

.article-metadata a {
  color: var(--text-muted);
}

.article-metadata a:hover {
  color: var(--accent);
}

.author-highlighted {
  color: var(--text-strong);
  font-weight: 700;
}

.page-subtitle,
.article-header-caption {
  color: var(--text-muted);
}

.article-style {
  color: var(--text-body);
}

.article-style p {
  margin-bottom: 0.85rem;
}

.site-footer {
  background: transparent;
  border-top: 1px solid var(--border);
  margin-top: 2.45rem;
  padding-top: 1.4rem;
}

.site-footer .powered-by {
  color: var(--text-muted);
  font-size: 0.81rem;
}

@media (min-width: 1200px) {
  .container {
    max-width: 1100px;
  }

  .about-profile-card {
    position: sticky;
    top: 5.5rem;
  }
}

@media (max-width: 991.98px) {
  .home-section {
    padding: 2.6rem 0;
  }

  .wg-about .container,
  .wg-featured .container {
    padding: 1.1rem;
  }

  .about-profile-card {
    margin-bottom: 0.2rem;
    padding: 1.2rem 1rem;
  }

  .about-content-col > h1 {
    margin-top: 0.2rem;
  }
}

@media (max-width: 575.98px) {
  #navbar-main .navbar-brand {
    font-size: 1rem;
  }

  .filter-search {
    min-width: 100%;
    width: 100%;
  }

  .form-row.mb-4 > .col-auto {
    margin-bottom: 0.5rem;
    width: 100%;
  }

  .pub-filters.form-control {
    width: 100%;
  }

  .card-simple,
  .compact-item-card {
    padding: 0.95rem;
  }
}