:root {
  --bg: #ffffff;
  --bg-soft: #f4f7fb;
  --card: rgba(255, 255, 255, 0.08);
  --surface: #ffffff;
  --text: #0f172a;
  --text-soft: #475569;
  --white-soft: rgba(255,255,255,.78);
  --primary: #4f7cff;
  --primary-2: #79a6ff;
  --border: rgba(15, 23, 42, 0.08);
  --line: rgba(15, 23, 42, .10);
  --shadow: 0 20px 60px rgba(2, 8, 23, 0.16);
  --nav-bg: rgba(8, 15, 29, 0.48);
  --nav-bg-scrolled: rgba(8, 15, 29, 0.68);
  --field-bg: #ffffff;
  --radius: 22px;
}

[data-theme="dark"] {
  --bg: #0b1220;
  --bg-soft: #101a2d;
  --surface: #111c31;
  --text: #e6edf8;
  --text-soft: #a8b7d3;
  --border: rgba(159, 184, 228, 0.18);
  --line: rgba(159, 184, 228, 0.25);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  --nav-bg: rgba(5, 10, 20, 0.62);
  --nav-bg-scrolled: rgba(5, 10, 20, 0.84);
  --field-bg: #0f1a2c;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
}

/* Narrower content width only for body sections (not navbar/hero) */
#about .container,
#research .container,
#projects .container,
#publications .container,
#team .container,
#contact .container {
  max-width: 900px;
}

@media (min-width: 1200px) {
  #about .container,
  #research .container,
  #projects .container,
  #publications .container,
  #team .container,
  #contact .container {
    max-width: 800px;
  }
}

.py-6 {
  padding-top: 6rem;
  padding-bottom: 6rem;
}

.section-anchor {
  scroll-margin-top: 84px;
}

section[id] {
  scroll-margin-top: 120px;
}

#mainNav {
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  transition: background-color .2s ease, box-shadow .2s ease;
}

#mainNav.scrolled {
  background: var(--nav-bg-scrolled);
  box-shadow: 0 10px 30px rgba(0,0,0,.18);
}

.theme-toggle {
  min-width: 116px;
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  font-weight: 700;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: inline-grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), #8cc7ff);
  color: white;
  font-size: .85rem;
}

.hero-section {
  position: relative;
  overflow: hidden;
  background:
    url("../img/bg-masthead.jpg") center / cover no-repeat,
    linear-gradient(180deg, #0f2442 0%, #173861 100%);
  color: white;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.95), rgba(0,0,0,.35));
}

.eyebrow,
.section-tag,
.project-label,
.panel-badge,
.publication-year {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .84rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.eyebrow,
.panel-badge {
  color: #a8c2ff;
}

.section-tag,
.publication-year,
.project-label {
  color: var(--primary);
}

.hero-section .lead {
  max-width: 52rem;
  color: var(--white-soft) !important;
}

.hero-content-box {
  display: inline-block;
  max-width: 760px;
  padding: 1.4rem 1.6rem;
  border-radius: 18px;
  background: rgba(8, 16, 30, .42);
  border: 1px solid rgba(255, 255, 255, .24);
  box-shadow: 0 14px 36px rgba(2, 8, 23, .22);
  backdrop-filter: blur(3px);
}

.hero-content-box p:last-child {
  margin-bottom: 0;
}

.glass-card,
.metric-card,
.info-card,
.project-card,
.person-card,
.contact-card,
.contact-form-card,
.publication-item {
  border-radius: var(--radius);
}

.glass-card {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.12);
  box-shadow: 0 24px 80px rgba(0,0,0,.22);
  padding: 2rem;
}

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

.feature-list li {
  position: relative;
  padding-left: 1.6rem;
  margin-bottom: 1rem;
  color: rgba(255,255,255,.85);
}

.feature-list li::before {
  content: "";
  width: .6rem;
  height: .6rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), #96c4ff);
  position: absolute;
  left: 0;
  top: .45rem;
}

.hero-metrics .metric-card {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.10);
  padding: 1.1rem 1rem;
  text-align: left;
}

.metric-card strong {
  display: block;
  font-size: 1.5rem;
}

.metric-card span {
  color: rgba(255,255,255,.72);
  font-size: .95rem;
}

.bg-soft {
  background: var(--bg-soft);
}

.bg-light {
  background-color: var(--bg-soft) !important;
}

.section-title {
  font-size: clamp(1.9rem, 1.2rem + 1.6vw, 3rem);
  line-height: 1.15;
  font-weight: 800;
  margin-top: .75rem;
  margin-bottom: 0;
}

.section-text {
  color: var(--text-soft);
  font-size: 1.05rem;
  line-height: 1.8;
}

.info-card,
.project-card,
.person-card,
.contact-card,
.contact-form-card,
.publication-item {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.info-card,
.project-card,
.person-card {
  padding: 1.75rem;
}

.info-card h3,
.project-card h3,
.person-card h3,
.publication-item h3 {
  font-size: 1.15rem;
  margin-bottom: .85rem;
}

.info-card p,
.project-card p,
.person-card p,
.contact-card p,
.publication-item p {
  color: var(--text-soft);
  margin-bottom: 0;
}

.icon-dot {
  width: .95rem;
  height: .95rem;
  border-radius: 50%;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary), #8ecbff);
  box-shadow: 0 0 0 8px rgba(79, 124, 255, .10);
}

.meta-list {
  list-style: none;
  padding: 0;
  margin: 1.2rem 0 0;
}

.meta-list li {
  padding: .55rem 0;
  border-top: 1px solid var(--line);
  color: var(--text-soft);
}

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

.publication-item {
  padding: 1.35rem 1.45rem;
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: flex-start;
}

.publication-venue {
  white-space: nowrap;
  font-weight: 700;
  color: var(--primary);
}

/* Publications as bibliography-style list (no cards) */
#publications .publication-list {
  display: block;
}

#publications .publication-item {
  background: transparent;
  border: 0;
  box-shadow: none;
  border-radius: 0;
  display: block;
  padding: .95rem 0;
  border-bottom: 1px solid var(--line);
}

#publications .publication-item.is-hidden {
  display: none;
}

#publications .publication-item:last-child {
  border-bottom: 0;
}

#publications .publication-item h3 {
  font-size: 1rem;
  margin-bottom: .45rem;
}

#publications .publication-year {
  margin-bottom: .4rem;
}

#publications .publication-venue {
  display: block;
  margin-top: .35rem;
  font-size: .9rem;
  font-weight: 600;
  color: var(--text-soft);
  white-space: normal;
}

/* Projects as list (no cards) */
#projects .project-list-simple {
  display: block;
}

#projects .project-row {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

#projects .project-row:last-child {
  border-bottom: 0;
}

#projects .project-row h3 {
  font-size: 1.05rem;
  margin-bottom: .45rem;
}

#projects .project-row p {
  margin: 0;
  color: var(--text-soft);
}

.team-photo {
  width: 168px;
  height: 168px;
  object-fit: cover;
  border-radius: 50%;
  margin: 0 auto 1rem;
  display: block;
  border: 2px solid rgba(255, 255, 255, .88);
  box-shadow: 0 10px 26px rgba(2, 8, 23, .14);
}

[data-theme="dark"] .team-photo {
  border-color: rgba(168, 183, 211, .5);
}

#team .person-card {
  background: transparent;
  border: 0;
  box-shadow: none;
  padding: 0;
  text-align: center;
}

#team .person-card h3 {
  font-size: 1.02rem;
  margin-bottom: .35rem;
}

#team .person-card .role {
  margin-bottom: .5rem;
}

#team .team-grid {
  row-gap: 2rem !important;
}

.person-card .role {
  font-weight: 700;
  color: var(--primary);
  margin-bottom: .75rem;
}

.avatar-placeholder {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #dce8ff, #edf4ff);
  color: var(--primary);
  font-weight: 800;
  margin-bottom: 1rem;
}

.cta-banner {
  background: linear-gradient(135deg, #1d4ed8, #0f3ca5 60%, #17307c);
  color: white;
  border-radius: calc(var(--radius) + 6px);
  padding: 2rem;
  display: flex;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 25px 70px rgba(15, 60, 165, 0.35);
}

.cta-banner .section-title,
.cta-banner .section-tag,
.cta-banner .section-text {
  color: white;
}

.contact-card,
.contact-form-card {
  padding: 1.75rem;
}

.form-control {
  border-radius: 14px;
  padding: .85rem 1rem;
  border-color: var(--border);
  background: var(--field-bg);
  color: var(--text);
}

.form-control:focus {
  border-color: rgba(79,124,255,.65);
  box-shadow: 0 0 0 .2rem rgba(79,124,255,.12);
  background: var(--field-bg);
  color: var(--text);
}

.form-control::placeholder {
  color: var(--text-soft);
}

[data-theme="dark"] .btn-outline-light {
  color: #e6edf8;
  border-color: rgba(230, 237, 248, .55);
}

[data-theme="dark"] .btn-outline-light:hover,
[data-theme="dark"] .btn-outline-light:focus {
  color: #0b1220;
  background-color: #e6edf8;
  border-color: #e6edf8;
}

.btn {
  border-radius: 14px;
  font-weight: 600;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #2f67ff);
  border-color: var(--primary);
}

.site-footer {
  background: #07101d;
  color: rgba(255,255,255,.76);
}

.back-to-top {
  color: #b9ccff;
}

.publication-item.is-hidden {
  display: none;
}

@media (max-width: 991.98px) {
  .py-6 {
    padding-top: 4.5rem;
    padding-bottom: 4.5rem;
  }

  .cta-banner,
  .publication-item {
    flex-direction: column;
  }
}

@media (max-width: 575.98px) {
  .hero-content-box {
    padding: 1rem 1rem;
    border-radius: 14px;
  }

  .glass-card,
  .hero-metrics .metric-card,
  .info-card,
  .project-card,
  .person-card,
  .contact-card,
  .contact-form-card,
  .publication-item,
  .cta-banner {
    border-radius: 18px;
  }

  .hero-section .display-4 {
    font-size: 2.35rem;
  }
}