*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #0a0f0d;
  --bg-secondary: #0d1512;
  --bg-card: #111c18;
  --bg-card-hover: #152420;
  --border: #1a2e27;
  --border-light: #234038;
  --text-primary: #e8eeec;
  --text-secondary: #8fa8a0;
  --text-muted: #5c7a70;
  --accent: #0d9488;
  --accent-light: #14b8a6;
  --accent-glow: rgba(13, 148, 136, 0.15);
  --accent-glow-strong: rgba(13, 148, 136, 0.3);
  --gradient-start: #0d9488;
  --gradient-end: #06b6d4;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(13, 148, 136, 0.15);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ——— Navbar ——— */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(10, 15, 13, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-main {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.02em;
}

.logo-sub {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--text-primary);
  background: var(--accent-glow);
}

.nav-cta {
  background: var(--accent) !important;
  color: #fff !important;
}

.nav-cta:hover {
  background: var(--accent-light) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ——— Hero ——— */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.grid-pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(13, 148, 136, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(13, 148, 136, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow-strong) 0%, transparent 60%);
  filter: blur(80px);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  background: var(--accent-glow);
  border: 1px solid var(--border-light);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 32px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 640px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 64px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 20px rgba(13, 148, 136, 0.3);
}

.btn-primary:hover {
  background: var(--accent-light);
  box-shadow: 0 0 30px rgba(13, 148, 136, 0.45);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.stat-value {
  display: block;
  font-size: 24px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* ——— Sections ——— */
.section {
  padding: 100px 0;
}

.section-dark {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-light);
  background: var(--accent-glow);
  padding: 6px 16px;
  border-radius: 100px;
  border: 1px solid var(--border-light);
  margin-bottom: 20px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  max-width: 700px;
  margin: 0 auto 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ——— About ——— */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: var(--transition);
}

.about-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.about-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  color: var(--accent-light);
}

.about-icon svg {
  width: 24px;
  height: 24px;
}

.about-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.about-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
}

/* ——— Research ——— */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.research-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: var(--transition);
  overflow: hidden;
}

.research-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--gradient-end));
  opacity: 0;
  transition: var(--transition);
}

.research-card:hover {
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.research-card:hover::before {
  opacity: 1;
}

.research-number {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.research-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  color: var(--accent-light);
}

.research-icon svg {
  width: 26px;
  height: 26px;
}

.research-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.research-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 20px;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.research-tags span {
  font-size: 12px;
  font-weight: 500;
  color: var(--accent-light);
  background: var(--accent-glow);
  padding: 4px 12px;
  border-radius: 100px;
  border: 1px solid var(--border-light);
}

/* ——— Projects ——— */
.projects-showcase {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.project-featured {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.project-card:hover {
  border-color: var(--border-light);
  box-shadow: var(--shadow-glow);
}

.project-img {
  overflow: hidden;
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
}

.project-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.project-card:hover .project-img img {
  transform: scale(1.03);
}

.project-info {
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.project-info h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.project-info p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 12px;
}

/* ——— Timeline / Achievements ——— */
.timeline {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.timeline-item {
  display: flex;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
}

.timeline-item:hover {
  border-color: var(--border-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.timeline-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(13, 148, 136, 0.1);
  border-radius: var(--radius-md);
  color: var(--accent, var(--accent-light));
}

.timeline-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--accent);
}

.timeline-content h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-content p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

/* ——— Events ——— */
.events-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.event-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.event-card:hover {
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.event-img {
  height: 220px;
  overflow: hidden;
}

.event-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.event-card:hover .event-img img {
  transform: scale(1.05);
}

.event-info {
  padding: 28px;
}

.event-date {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent-light);
  background: var(--accent-glow);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 12px;
}

.event-info h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.event-info p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

/* ——— Team ——— */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.team-card {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  transition: var(--transition);
}

.team-card:hover {
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.team-pi {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
}

.team-avatar {
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 50%;
  margin: 0 auto 20px;
  color: var(--accent-light);
}

.team-avatar svg {
  width: 32px;
  height: 32px;
}

.team-card h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.team-role {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.team-note {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  padding: 24px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.team-note p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

/* ——— CTA / Contact ——— */
.cta-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.cta-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.cta-content > p {
  color: var(--text-secondary);
  font-size: 17px;
  line-height: 1.7;
  margin-bottom: 32px;
}

.cta-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.cta-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.cta-info-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 14px;
}

.cta-info-item svg {
  color: var(--accent-light);
  flex-shrink: 0;
}

/* ——— Footer ——— */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.footer-brand {
  text-align: center;
}

.footer-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-bottom: 8px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 13px;
  max-width: 400px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent-light);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  width: 100%;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 13px;
}

/* ——— Scroll Animations ——— */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ——— Responsive ——— */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
  .research-grid {
    grid-template-columns: 1fr;
  }
  .project-featured {
    grid-template-columns: 1fr;
  }
  .project-img {
    height: 300px;
  }
  .timeline {
    grid-template-columns: 1fr;
  }
  .events-grid {
    grid-template-columns: 1fr;
  }
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 15, 13, 0.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 4px;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    min-height: auto;
    padding: 140px 0 60px;
  }

  .hero-stats {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .stat-divider {
    width: 60px;
    height: 1px;
  }

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

  .btn {
    justify-content: center;
  }

  .section {
    padding: 64px 0;
  }

  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cta-links {
    flex-direction: column;
    align-items: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .project-info {
    padding: 28px;
  }
}