/* Home Page - Qwen-inspired Design */

/* Hero Section - Integrated with Header */
.hero-section {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: 80px; /* Account for header height */
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.gradient-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  /* Top gradient that blends with header */
  background: linear-gradient(180deg, rgba(15, 15, 35, 1) 0%, rgba(15, 15, 35, 0.8) 10%, transparent 20%),
    /* Main aurora gradients */
    radial-gradient(circle at 20% 50%, rgba(0, 255, 255, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 0, 255, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 40% 80%, rgba(255, 165, 0, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 60% 40%, rgba(138, 43, 226, 0.2) 0%, transparent 50%), /* Base gradient */
    linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
  animation: gradientShift 20s ease-in-out infinite;
}

@keyframes gradientShift {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.8;
  }
}

.stars {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(2px 2px at 20px 30px, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(255, 255, 255, 0.2), transparent),
    radial-gradient(1px 1px at 90px 40px, rgba(255, 255, 255, 0.4), transparent),
    radial-gradient(1px 1px at 130px 80px, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(2px 2px at 160px 30px, rgba(255, 255, 255, 0.2), transparent);
  background-repeat: repeat;
  background-size: 200px 100px;
  animation: twinkle 10s linear infinite;
}

@keyframes twinkle {
  0%,
  100% {
    opacity: 0.3;
  }
  50% {
    opacity: 0.8;
  }
}

.hero-container {
  position: relative;
  z-index: 2;
  text-align: center;
  color: white;
  max-width: 800px;
  padding: 0 2rem;
}

.hero-content {
  margin-bottom: 4rem;
}

.hero-title {
  font-size: 6rem;
  font-weight: 300;
  margin-bottom: 1.5rem;
  line-height: 1;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.8) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
  0% {
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
  }
  100% {
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.6);
  }
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.6);
  animation: bounce 2s infinite;
  cursor: pointer;
  transition: color 0.3s ease;
}

.scroll-indicator:hover {
  color: rgba(255, 255, 255, 0.9);
}

@keyframes bounce {
  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* Content Section */
.content-section {
  background: #0a0a0a;
  color: white;
  padding: 6rem 0;
}

.content-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-block {
  margin-bottom: 6rem;
}

.section-block:last-child {
  margin-bottom: 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 300;
  text-align: center;
  margin-bottom: 3rem;
  color: white;
  position: relative;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -1rem;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
}

.section-description {
  text-align: center;
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

/* Research Grid */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.research-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 2rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.research-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.research-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-4px);
}

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

.item-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.item-category {
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.9);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.item-date {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

.item-title {
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: 1rem;
  line-height: 1.4;
}

.item-title a {
  color: white;
  text-decoration: none;
  transition: color 0.3s ease;
}

.item-title a:hover {
  color: rgba(255, 255, 255, 0.8);
}

.item-description {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.item-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1rem;
}

.item-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.item-link:hover {
  color: white;
}

.item-link svg {
  transition: transform 0.3s ease;
}

.item-link:hover svg {
  transform: translateX(2px);
}

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

.view-all-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: white;
  text-decoration: none;
  font-weight: 400;
  padding: 1rem 2rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  transition: all 0.3s ease;
  background: rgba(255, 255, 255, 0.03);
}

.view-all-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.view-all-btn svg {
  transition: transform 0.3s ease;
}

.view-all-btn:hover svg {
  transform: translateX(2px);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.stat-card {
  text-align: center;
  padding: 2rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.stat-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 300;
  color: white;
  margin-bottom: 0.5rem;
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Connect Grid */
.connect-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.connect-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 2rem;
  text-decoration: none;
  color: white;
  transition: all 0.3s ease;
  text-align: center;
}

.connect-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-4px);
  color: white;
}

.connect-icon {
  margin-bottom: 1rem;
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.connect-card:hover .connect-icon {
  opacity: 1;
}

.connect-title {
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: 0.75rem;
  color: white;
}

.connect-description {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.5;
  font-size: 0.95rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 4.5rem;
  }

  .research-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-section {
    padding-top: 70px;
  }

  .hero-container {
    padding: 0 1rem;
  }

  .hero-title {
    font-size: 3.5rem;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }

  .content-container {
    padding: 0 1rem;
  }

  .section-title {
    font-size: 2rem;
  }

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

  .connect-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .hero-section {
    padding-top: 60px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .research-item,
  .stat-card,
  .connect-card {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-section {
    padding-top: 60px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }
}

/* Smooth scroll behavior */
html {
  scroll-behavior: smooth;
}

/* Fade in animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.research-item,
.stat-card,
.connect-card {
  animation: fadeInUp 0.6s ease-out;
}

.research-item:nth-child(1) {
  animation-delay: 0.1s;
}
.research-item:nth-child(2) {
  animation-delay: 0.2s;
}
.research-item:nth-child(3) {
  animation-delay: 0.3s;
}

.stat-card:nth-child(1) {
  animation-delay: 0.1s;
}
.stat-card:nth-child(2) {
  animation-delay: 0.2s;
}
.stat-card:nth-child(3) {
  animation-delay: 0.3s;
}
.stat-card:nth-child(4) {
  animation-delay: 0.4s;
}

.connect-card:nth-child(1) {
  animation-delay: 0.1s;
}
.connect-card:nth-child(2) {
  animation-delay: 0.2s;
}
.connect-card:nth-child(3) {
  animation-delay: 0.3s;
}