/* ============================================
   Modern Lab Homepage Styles
   Inspired by OpenAI, Anthropic, etc.
   ============================================ */

:root {
  --primary-color: #10a37f;
  --primary-dark: #0d8c6f;
  --secondary-color: #1a73e8;
  --accent-color: #ea4335;
  --text-primary: #1a1a1a;
  --text-secondary: #5f6368;
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-dark: #1a1a1a;
  --border-color: #e8eaed;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
  --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Google Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

/* ============================================
   Navigation
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-logo .logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 15px;
  transition: var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after {
  width: 100%;
}

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

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  border-radius: 3px;
  transition: var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: 70px;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  z-index: 0;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.3;
  animation: float 20s infinite ease-in-out;
}

.orb-1 {
  width: 500px;
  height: 500px;
  background: var(--gradient-1);
  top: -200px;
  left: -200px;
  animation-delay: 0s;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: var(--gradient-2);
  bottom: -150px;
  right: -150px;
  animation-delay: 5s;
}

.orb-3 {
  width: 350px;
  height: 350px;
  background: var(--gradient-3);
  top: 50%;
  right: 10%;
  animation-delay: 10s;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(30px, -30px) scale(1.1);
  }
  66% {
    transform: translate(-20px, 20px) scale(0.9);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  width: 100%;
}

.hero-title {
  margin-bottom: 24px;
}

.title-line {
  display: block;
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease-out;
}

.title-subtitle {
  display: block;
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 400;
  color: var(--text-secondary);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-description {
  font-size: clamp(18px, 2.5vw, 24px);
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto 48px;
  line-height: 1.8;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 64px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   Section Styles
   ============================================ */

section {
  padding: 120px 0;
  position: relative;
}

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

.section-title {
  font-size: clamp(36px, 5vw, 48px);
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
}

/* ============================================
   Publications Section
   ============================================ */

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

.publications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.paper-card {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.paper-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-1);
  transform: scaleX(0);
  transition: var(--transition);
}

.paper-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.paper-card:hover::before {
  transform: scaleX(1);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

.card-badge {
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-acl {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.badge-iccv {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
}

.badge-aaai {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  color: white;
}

.badge-icml {
  background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
  color: white;
}

.badge-neurips {
  background: linear-gradient(135deg, #a8e6cf 0%, #3fc1c9 100%);
  color: white;
}

.badge-iclr {
  background: linear-gradient(135deg, #ffd93d 0%, #f6b93b 100%);
  color: white;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--primary-color);
}

.card-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.5;
}

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

.card-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.feature-tag {
  padding: 4px 12px;
  background: var(--bg-secondary);
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
}

.card-footer {
  margin-top: auto;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: var(--transition);
}

.card-link:hover {
  gap: 12px;
  color: var(--primary-dark);
}

/* ============================================
   Team Section
   ============================================ */

.team {
  background: var(--bg-primary);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.member-card {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid var(--border-color);
  text-align: center;
}

.member-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

.member-avatar {
  margin-bottom: 24px;
}

.avatar-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
}

.avatar-placeholder {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--gradient-1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  font-size: 48px;
  color: white;
  box-shadow: var(--shadow-lg);
}

.member-name {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.member-role {
  font-size: 16px;
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 16px;
}

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

.member-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.member-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--bg-secondary);
  border-radius: 8px;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
}

.member-link:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

/* ============================================
   Contact Section
   ============================================ */

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

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.contact-card {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: 40px 32px;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.contact-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

.contact-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--gradient-1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 28px;
  color: white;
}

.contact-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.contact-info {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.contact-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

.contact-link:hover {
  text-decoration: underline;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--bg-dark);
  color: white;
  padding: 48px 0;
}

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

.footer-logo .logo-text {
  font-size: 20px;
  font-weight: 700;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.footer-text {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 16px;
}

.footer-link {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-decoration: none;
  transition: var(--transition);
}

.footer-link:hover {
  background: var(--primary-color);
  transform: translateY(-2px);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background: white;
    width: 100%;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    padding: 24px 0;
    gap: 0;
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-link {
    padding: 16px;
    display: block;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-stats {
    gap: 32px;
  }

  .publications-grid,
  .team-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  section {
    padding: 80px 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .paper-card,
  .member-card,
  .contact-card {
    padding: 24px;
  }
}