/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: #1a1a2e; background: #fff; line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== HEADER ===== */
.site-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(255,255,255,0.97); backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: box-shadow 0.3s;
}
.site-header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.08); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 0 24px; height: 72px;
}
.header-logo {
  display: flex; align-items: center; gap: 10px;
}
.header-logo img {
  height: 48px; width: 48px; border-radius: 50%; object-fit: cover;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.header-logo .logo-text {
  font-size: 0.85rem; font-weight: 700; color: #1a1a2e; line-height: 1.3;
}
.header-logo .logo-text span { color: #16a34a; }
@media (max-width: 900px) {
  .header-logo .logo-text { display: none; }
}
.header-nav { display: flex; align-items: center; gap: 4px; }
.nav-item { position: relative; }
.nav-item > a, .nav-folder > .nav-folder-title {
  display: flex; align-items: center; gap: 4px;
  padding: 8px 14px; border-radius: 8px; font-size: 0.9rem; font-weight: 500;
  color: #333; cursor: pointer; border: none; background: none;
  transition: background 0.2s, color 0.2s;
}
.nav-item > a:hover, .nav-folder > .nav-folder-title:hover,
.nav-item > a.active { background: #f0fdf4; color: #16a34a; }
.nav-folder-title svg {
  width: 12px; height: 12px; transition: transform 0.2s;
}
.nav-dropdown {
  display: none; position: absolute; top: 100%; left: 0;
  background: #fff; border-radius: 12px; padding: 8px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.12); min-width: 200px;
  border: 1px solid rgba(0,0,0,0.06);
}
.nav-folder:hover .nav-dropdown { display: block; }
.nav-folder:hover .nav-folder-title svg { transform: rotate(180deg); }
.nav-dropdown a {
  display: block; padding: 10px 14px; border-radius: 8px;
  font-size: 0.875rem; font-weight: 500; color: #444;
  transition: background 0.2s, color 0.2s;
}
.nav-dropdown a:hover { background: #f0fdf4; color: #16a34a; }

/* Mobile menu */
.burger { display: none; flex-direction: column; gap: 5px; cursor: pointer;
  padding: 8px; border: none; background: none; }
.burger span { width: 24px; height: 2px; background: #333; border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s; }
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 900px) {
  .burger { display: flex; }
  .header-nav {
    display: none; position: fixed; top: 72px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 16px 24px;
    border-bottom: 1px solid #eee; gap: 0; max-height: calc(100vh - 72px);
    overflow-y: auto;
  }
  .header-nav.open { display: flex; }
  .nav-dropdown { position: static; box-shadow: none; border: none;
    padding: 0 0 0 16px; display: none; }
  .nav-folder.open .nav-dropdown { display: block; }
  .nav-item > a, .nav-folder > .nav-folder-title {
    padding: 12px 14px; font-size: 1rem;
  }
}

/* ===== HERO ===== */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  justify-content: center; text-align: center; overflow: hidden;
  background: linear-gradient(135deg, #0f2027, #203a43, #1a472a);
  margin-top: 72px;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: center; opacity: 0.25;
}
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(135deg, rgba(15,32,39,0.8), rgba(26,71,42,0.7));
}
.hero-content { position: relative; z-index: 2; padding: 40px 24px; max-width: 800px; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; color: #fff;
  line-height: 1.15; margin-bottom: 20px;
}
.hero h1 span { color: #4ade80; }
.hero p { font-size: clamp(1rem, 2vw, 1.25rem); color: rgba(255,255,255,0.85);
  margin-bottom: 32px; line-height: 1.8; }
.hero .tagline {
  display: inline-block; padding: 8px 24px; border: 1px solid rgba(74,222,128,0.4);
  border-radius: 50px; color: #4ade80; font-size: 0.9rem; font-weight: 600;
  letter-spacing: 1px; text-transform: uppercase; margin-bottom: 24px;
  background: rgba(74,222,128,0.08);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 50px; font-weight: 600;
  font-size: 0.95rem; cursor: pointer; border: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.3s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: #16a34a; color: #fff; }
.btn-primary:hover { background: #15803d; box-shadow: 0 8px 24px rgba(22,163,74,0.3); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.3); }
.btn-outline:hover { border-color: #4ade80; color: #4ade80; }
.btn-dark { background: #1a1a2e; color: #fff; }
.btn-dark:hover { background: #16a34a; box-shadow: 0 8px 24px rgba(22,163,74,0.3); }
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== SECTIONS ===== */
section { padding: 100px 0; }
.section-light { background: #fff; }
.section-grey { background: #f8faf9; }
.section-dark { background: #1a1a2e; color: #fff; }
.section-green { background: linear-gradient(135deg, #0f2027, #1a472a); color: #fff; }

.section-header { text-align: center; margin-bottom: 60px; }
.section-header .overline {
  display: inline-block; font-size: 0.8rem; font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase; color: #16a34a;
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 800; line-height: 1.2;
  margin-bottom: 16px;
}
.section-header p { font-size: 1.05rem; color: #666; max-width: 640px; margin: 0 auto; }
.section-dark .section-header p { color: rgba(255,255,255,0.7); }

/* ===== ABOUT GRID ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 16px; }
.about-text p { color: #555; margin-bottom: 16px; }
.about-image { border-radius: 16px; overflow: hidden; }
.about-image img { width: 100%; object-fit: cover; }
@media (max-width: 768px) { .about-grid { grid-template-columns: 1fr; gap: 32px; } }

/* ===== HIGHLIGHTS / FEATURES ===== */
.highlights-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px;
}
.highlight-card {
  background: #fff; border-radius: 16px; padding: 32px;
  border: 1px solid #e8ede9; transition: transform 0.2s, box-shadow 0.2s;
}
.highlight-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.08); }
.highlight-card .icon {
  width: 52px; height: 52px; border-radius: 12px;
  background: linear-gradient(135deg, #dcfce7, #bbf7d0);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 20px;
}
.highlight-card h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.highlight-card p { font-size: 0.92rem; color: #666; line-height: 1.7; }

/* ===== CAROUSEL ===== */
.carousel-wrapper { position: relative; overflow: hidden; }
.carousel-track {
  display: flex; gap: 20px; transition: transform 0.4s ease;
}
.carousel-slide {
  flex: 0 0 calc(33.333% - 14px); min-width: 0;
}
.carousel-slide img {
  width: 100%; aspect-ratio: 1/1; object-fit: cover; border-radius: 12px;
  cursor: pointer; transition: transform 0.2s;
}
.carousel-slide img:hover { transform: scale(1.02); }
.carousel-slide h4 {
  text-align: center; margin-top: 14px; font-size: 1.05rem; font-weight: 600;
  color: #333;
}
.carousel-nav {
  display: flex; gap: 12px; justify-content: center; margin-top: 28px;
}
.carousel-nav button {
  width: 48px; height: 48px; border-radius: 50%; border: none; cursor: pointer;
  background: #16a34a; display: flex; align-items: center; justify-content: center;
  transition: background 0.2s, transform 0.1s;
}
.carousel-nav button:hover { background: #15803d; transform: scale(1.05); }
.carousel-nav button:active { transform: scale(0.95); }
.carousel-nav svg { width: 22px; height: 22px; stroke: #fff; stroke-width: 2.5; fill: none; }
@media (max-width: 768px) {
  .carousel-slide { flex: 0 0 calc(50% - 10px); }
}
@media (max-width: 480px) {
  .carousel-slide { flex: 0 0 100%; }
}

/* ===== TEAM CARDS ===== */
.team-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 32px;
}
.team-card {
  background: #fff; border-radius: 20px; overflow: hidden;
  border: 1px solid #e8ede9; transition: transform 0.2s, box-shadow 0.2s;
}
.team-card:hover { transform: translateY(-4px); box-shadow: 0 16px 48px rgba(0,0,0,0.1); }
.team-card-img { width: 100%; height: 320px; object-fit: cover; }
.team-card-body { padding: 28px; }
.team-card-body .role {
  display: inline-block; font-size: 0.75rem; font-weight: 700;
  letter-spacing: 1.5px; text-transform: uppercase; color: #16a34a;
  margin-bottom: 8px;
}
.team-card-body h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 8px; }
.team-card-body .dept { font-size: 0.875rem; color: #888; margin-bottom: 12px; }
.team-card-body p { font-size: 0.9rem; color: #555; line-height: 1.7; margin-bottom: 16px; }
.team-links { display: flex; gap: 12px; }
.team-links a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: 8px; font-size: 0.8rem;
  font-weight: 600; background: #f0fdf4; color: #16a34a;
  transition: background 0.2s;
}
.team-links a:hover { background: #dcfce7; }

/* ===== MEMBER LIST (horizontal card) ===== */
.member-card {
  display: grid; grid-template-columns: 200px 1fr; gap: 32px;
  background: #fff; border-radius: 20px; padding: 32px; margin-bottom: 24px;
  border: 1px solid #e8ede9; align-items: start;
  transition: transform 0.2s, box-shadow 0.2s;
}
.member-card:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0,0,0,0.06); }
.member-card img {
  width: 200px; height: 200px; object-fit: cover; border-radius: 16px;
}
.member-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 4px; }
.member-card .dept { font-size: 0.85rem; color: #16a34a; font-weight: 600; margin-bottom: 12px; }
.member-card p { font-size: 0.9rem; color: #555; line-height: 1.7; }
@media (max-width: 640px) {
  .member-card { grid-template-columns: 1fr; text-align: center; }
  .member-card img { margin: 0 auto; width: 160px; height: 160px; }
}

/* ===== RESEARCH CARDS ===== */
.research-card {
  background: #fff; border-radius: 20px; padding: 36px;
  border: 1px solid #e8ede9; margin-bottom: 24px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.research-card:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,0,0,0.06); }
.research-card .meta {
  display: flex; gap: 16px; margin-bottom: 12px; flex-wrap: wrap;
}
.research-card .meta span {
  font-size: 0.8rem; font-weight: 600; padding: 4px 12px; border-radius: 6px;
}
.research-card .meta .tag-name { background: #f0fdf4; color: #16a34a; }
.research-card .meta .tag-level { background: #eff6ff; color: #2563eb; }
.research-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.research-card p { font-size: 0.92rem; color: #555; line-height: 1.8; margin-bottom: 12px; }
.research-card .supervisors { font-size: 0.875rem; color: #888; font-weight: 500; }
.research-card .supervisors strong { color: #333; }

/* ===== NEWS CARDS ===== */
.news-card {
  display: grid; grid-template-columns: 280px 1fr; gap: 32px;
  background: #fff; border-radius: 20px; overflow: hidden;
  border: 1px solid #e8ede9; margin-bottom: 32px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.news-card:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0,0,0,0.06); }
.news-card img { width: 100%; height: 100%; object-fit: cover; min-height: 220px; }
.news-card-body { padding: 32px; }
.news-card-body .date {
  font-size: 0.8rem; font-weight: 600; color: #16a34a; margin-bottom: 8px;
}
.news-card-body h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; line-height: 1.4; }
.news-card-body p { font-size: 0.9rem; color: #555; line-height: 1.7; }
@media (max-width: 768px) { .news-card { grid-template-columns: 1fr; } }

/* ===== FOCUS AREAS ===== */
.focus-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px;
}
.focus-card {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px; padding: 32px; transition: background 0.2s, transform 0.2s;
}
.focus-card:hover { background: rgba(255,255,255,0.1); transform: translateY(-2px); }
.focus-card h4 { font-size: 1.05rem; font-weight: 700; color: #4ade80; margin-bottom: 12px; }
.focus-card ul { padding-left: 0; }
.focus-card li {
  font-size: 0.9rem; color: rgba(255,255,255,0.8); padding: 4px 0 4px 20px;
  position: relative;
}
.focus-card li::before {
  content: ''; position: absolute; left: 0; top: 12px;
  width: 8px; height: 8px; border-radius: 50%; background: #4ade80;
}

/* ===== PARTNERS ===== */
.partners-grid {
  display: flex; align-items: center; justify-content: center;
  flex-wrap: wrap; gap: 40px;
}
.partners-grid img {
  height: 50px; width: auto; object-fit: contain;
  filter: grayscale(100%); opacity: 0.6;
  transition: filter 0.3s, opacity 0.3s;
}
.partners-grid img:hover { filter: grayscale(0%); opacity: 1; }

/* ===== STATS ===== */
.stats-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px; text-align: center;
}
.stat-item h3 { font-size: 2.5rem; font-weight: 800; color: #4ade80; }
.stat-item p { font-size: 0.9rem; color: rgba(255,255,255,0.7); margin-top: 4px; }

/* ===== CONTACT ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-info h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 20px; }
.contact-info-item {
  display: flex; gap: 16px; margin-bottom: 24px; align-items: flex-start;
}
.contact-info-item .ci-icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: #f0fdf4; display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; flex-shrink: 0;
}
.contact-info-item h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; }
.contact-info-item p { font-size: 0.875rem; color: #666; }
.contact-info-item a { color: #16a34a; font-weight: 500; }
.contact-info-item a:hover { text-decoration: underline; }

.contact-form label {
  display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; color: #333;
}
.contact-form input, .contact-form textarea, .contact-form select {
  width: 100%; padding: 14px 16px; border: 1px solid #ddd; border-radius: 10px;
  font-size: 0.95rem; font-family: inherit; margin-bottom: 20px;
  transition: border-color 0.2s, box-shadow 0.2s; background: #fff;
}
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus {
  outline: none; border-color: #16a34a; box-shadow: 0 0 0 3px rgba(22,163,74,0.1);
}
.contact-form textarea { resize: vertical; min-height: 140px; }
@media (max-width: 768px) { .contact-grid { grid-template-columns: 1fr; gap: 40px; } }

/* ===== GALLERY ===== */
.gallery-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.gallery-grid img {
  width: 100%; height: 200px; object-fit: cover; border-radius: 12px;
  transition: transform 0.3s; cursor: pointer;
}
.gallery-grid img:hover { transform: scale(1.03); }

/* ===== QUOTE ===== */
.quote-block {
  max-width: 800px; margin: 0 auto; text-align: center; padding: 40px 24px;
}
.quote-block blockquote {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem); font-style: italic; color: #333;
  line-height: 1.8; position: relative; padding: 0 24px;
}
.quote-block blockquote::before {
  content: '\201C'; font-size: 4rem; color: #4ade80; position: absolute;
  top: -20px; left: -10px; font-family: Georgia, serif;
}
.quote-block cite { display: block; margin-top: 16px; font-size: 0.9rem; color: #888; }

/* ===== FOOTER ===== */
.site-footer {
  background: #111827; color: rgba(255,255,255,0.7); padding: 60px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
  padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand h3 { font-size: 1.25rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.footer-brand .tagline { font-size: 0.95rem; color: rgba(255,255,255,0.6); margin-bottom: 0; }
.footer-col h4 { font-size: 0.85rem; font-weight: 700; color: #fff;
  text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; }
.footer-col p { font-size: 0.875rem; line-height: 1.8; margin-bottom: 4px; }
.footer-col a { color: #4ade80; transition: color 0.2s; }
.footer-col a:hover { color: #86efac; text-decoration: underline; }
.footer-bottom { text-align: center; padding: 24px 0; font-size: 0.8rem; }
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ===== RESEARCH CONTRIBUTIONS ===== */
.research-contrib {
  max-width: 700px; margin: 0 auto; font-style: italic;
}
.research-contrib p { color: rgba(255,255,255,0.85); margin-bottom: 8px; font-size: 0.95rem; }

/* ===== VISIT INFO ===== */
.visit-info h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.visit-info p { margin-bottom: 6px; }
.visit-info a { color: #16a34a; }
.visit-info a:hover { text-decoration: underline; }

/* ===== VIDEO PLACEHOLDER ===== */
.video-placeholder {
  background: #000; border-radius: 12px; padding: 60px 24px;
  text-align: center; color: #fff; margin-top: 24px;
}
.video-placeholder h4 { font-size: 1rem; font-weight: 600; color: #4ade80; }

/* ===== BREADCRUMB / PAGE BANNER ===== */
.page-banner {
  background: linear-gradient(135deg, #0f2027, #203a43, #1a472a);
  padding: 140px 0 60px; text-align: center; margin-top: 72px;
}
.page-banner h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem); font-weight: 800; color: #fff;
}
.page-banner p { color: rgba(255,255,255,0.7); margin-top: 12px; font-size: 1.05rem; }

/* ===== PUBLICATIONS LIST ===== */
.pub-list { max-width: 800px; margin: 0 auto; }
.pub-item {
  padding: 24px 0; border-bottom: 1px solid #e8ede9;
}
.pub-item:last-child { border-bottom: none; }
.pub-item h4 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.pub-item p { font-size: 0.875rem; color: #666; }

/* ===== ABOUT SECTIONS (2-col with image) ===== */
.split-section {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.split-section.reverse { direction: rtl; }
.split-section.reverse > * { direction: ltr; }
.split-image img { border-radius: 16px; width: 100%; }
.split-text h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 16px; }
.split-text p { color: #555; margin-bottom: 16px; font-size: 0.95rem; }
@media (max-width: 768px) {
  .split-section, .split-section.reverse { grid-template-columns: 1fr; direction: ltr; gap: 32px; }
}

/* ===== LEARNING OPPORTUNITIES ===== */
.opportunity-list { max-width: 700px; }
.opportunity-item { display: flex; gap: 16px; margin-bottom: 24px; }
.opportunity-item .opp-dot {
  width: 12px; height: 12px; border-radius: 50%; background: #4ade80;
  flex-shrink: 0; margin-top: 6px;
}
.opportunity-item h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.opportunity-item p { font-size: 0.9rem; color: rgba(255,255,255,0.75); }

/* ===== MAP ===== */
.map-container { border-radius: 16px; overflow: hidden; height: 300px; }
.map-container iframe { width: 100%; height: 100%; border: 0; }

/* ===== ANIMATIONS ===== */
.fade-up {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ===== LIGHTBOX ===== */
.lightbox {
  display: none; position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,0.92); align-items: center; justify-content: center;
}
.lightbox.active { display: flex; }
.lightbox img {
  max-width: 90vw; max-height: 85vh; object-fit: contain;
  border-radius: 8px; user-select: none;
  animation: lbFadeIn 0.25s ease;
}
@keyframes lbFadeIn { from { opacity:0; transform:scale(0.95) } to { opacity:1; transform:scale(1) } }
.lightbox-close {
  position: absolute; top: 20px; right: 24px;
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255,255,255,0.1); border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s;
}
.lightbox-close:hover { background: rgba(255,255,255,0.2); }
.lightbox-close svg { width: 20px; height: 20px; stroke: #fff; stroke-width: 2; }
.lightbox-prev, .lightbox-next {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 52px; height: 52px; border-radius: 50%;
  background: rgba(255,255,255,0.1); border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s;
}
.lightbox-prev { left: 16px; }
.lightbox-next { right: 16px; }
.lightbox-prev:hover, .lightbox-next:hover { background: rgba(255,255,255,0.25); }
.lightbox-prev svg, .lightbox-next svg { width: 24px; height: 24px; stroke: #fff; stroke-width: 2; fill: none; }
.lightbox-counter {
  position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%);
  color: rgba(255,255,255,0.6); font-size: 0.85rem; font-weight: 500;
}