/* ====================================
   PuzzleVerse AI - Liquid Glass Design System
   ==================================== */

:root {
  --primary: #1a1a1a;
  --secondary: #2a2a2a;
  --accent: #ffffff;
  --accent-secondary: #666666;
  --glass-bg: rgba(26, 26, 26, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-hover: rgba(42, 42, 42, 0.8);
  --text-primary: #FFFFFF;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --rounded-2xl: 1rem;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  background: linear-gradient(135deg, #000000 0%, #1a1a1a 50%, #0a0a0a 100%);
  background-attachment: fixed;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(255, 255, 255, 0.02) 0%, transparent 50%);
  animation: gradientShift 15s ease infinite;
  pointer-events: none;
  z-index: 0;
}

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

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  border: 1px solid var(--glass-border);
  border-radius: var(--rounded-2xl);
  transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.glass:hover {
  background: var(--glass-hover);
  box-shadow: 
    0 8px 32px 0 rgba(255, 255, 255, 0.1),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 2rem;
  transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

header.scrolled {
  background: rgba(26, 26, 26, 0.9);
  backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

nav {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  width: 2rem;
  height: 2rem;
  background: var(--accent);
  color: var(--primary);
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
  position: relative;
}

.nav-links a:hover {
  color: var(--accent-secondary);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1rem;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

main {
  position: relative;
  z-index: 1;
  padding-top: 80px;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem;
}

.hero-content {
  max-width: 900px;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  line-height: 1.1;
  color: var(--text-primary);
}

.hero p {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.cta-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 1rem 2.5rem;
  border-radius: var(--rounded-2xl);
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--accent);
  color: var(--primary);
  box-shadow: 0 8px 24px rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 
    0 12px 32px rgba(255, 255, 255, 0.3),
    inset 0 1px 0 0 rgba(0, 0, 0, 0.2);
}

.btn-secondary {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  color: white;
  border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
  background: var(--glass-hover);
  transform: translateY(-2px);
  box-shadow: 
    0 8px 24px rgba(255, 255, 255, 0.1),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.3);
}

.section {
  padding: 6rem 2rem;
}

.section-title {
  text-align: center;
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 3rem;
  color: var(--text-primary);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.card {
  padding: 2.5rem;
  transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.card-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  display: inline-block;
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.card p {
  color: var(--text-secondary);
  line-height: 1.8;
}

.card:hover .card-icon {
  transform: scale(1.1) rotate(5deg);
  transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

footer {
  position: relative;
  z-index: 1;
  padding: 3rem 2rem;
  text-align: center;
  background: rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  border-top: 1px solid var(--glass-border);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

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

.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin: 2rem 0;
}

.social-link {
  width: 3rem;
  height: 3rem;
  border-radius: 9999px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1.2rem;
  transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.social-link:hover {
  background: var(--glass-hover);
  transform: translateY(-2px);
  box-shadow: 
    0 8px 24px rgba(255, 255, 255, 0.1),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.2);
}

.form-group {
  margin-bottom: 2rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem 1.5rem;
  border-radius: var(--rounded-2xl);
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 
    0 0 0 3px rgba(255, 255, 255, 0.1),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.2);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
}

.badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  border-radius: 9999px;
  background: var(--accent);
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
    -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(1.1);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    transform: translateY(-100%);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    pointer-events: none;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero p {
    font-size: 1.2rem;
  }

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

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

  .cta-buttons {
    flex-direction: column;
  }
}