:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --secondary: #f472b6;
  --accent: #22d3ee;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --card-bg: rgba(255, 255, 255, 0.95);
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  --shadow-hover: 0 20px 60px rgba(0, 0, 0, 0.2);
  --radius: 20px;
  --radius-sm: 12px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: linear-gradient(135deg, #a8edea 0%, #fed6e3 50%, #d299c2 100%);
  min-height: 100vh;
  color: var(--text-primary);
  line-height: 1.6;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  font-size: 1.8rem;
}

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

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--bg-gradient);
  border-radius: 2px;
  transition: width 0.3s ease;
}

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

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 10px;
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  border-radius: 3px;
  transition: all 0.3s ease;
}

main {
  padding-top: 80px;
  min-height: calc(100vh - 120px);
}

.hero {
  text-align: center;
  padding: 4rem 2rem;
  background: var(--bg-gradient);
  color: white;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 1rem;
  text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.2);
}

.hero p {
  font-size: 1.2rem;
  opacity: 0.95;
  max-width: 600px;
  margin: 0 auto;
}

.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  padding: 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.game-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
}

.game-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: var(--bg-gradient);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.game-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: var(--shadow-hover);
}

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

.game-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  display: block;
}

.game-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.game-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.play-btn {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.8rem 2rem;
  background: var(--bg-gradient);
  color: white;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.play-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

.game-container {
  padding: 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.game-title {
  font-size: 1.8rem;
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.score-board {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.score-item {
  background: var(--card-bg);
  padding: 0.8rem 1.5rem;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.score-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.score-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.game-controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.control-btn {
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control-btn.primary {
  background: var(--bg-gradient);
  color: white;
}

.control-btn.secondary {
  background: white;
  color: var(--text-primary);
  border: 2px solid #e5e7eb;
}

.control-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.game-board {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 400px;
}

.game-instructions {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.game-instructions h3 {
  color: var(--primary);
  margin-bottom: 1rem;
}

.game-instructions ul {
  list-style: none;
  padding-left: 0;
}

.game-instructions li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-secondary);
}

.game-instructions li::before {
  content: '🎮';
  position: absolute;
  left: 0;
}

footer {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  padding: 2rem;
  text-align: center;
  margin-top: 3rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.copyright {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.back-home {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 60px;
  height: 60px;
  background: var(--bg-gradient);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  z-index: 999;
}

.back-home:hover {
  transform: scale(1.1) rotate(10deg);
  box-shadow: var(--shadow-hover);
}

.sound-toggle {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  width: 50px;
  height: 50px;
  background: var(--card-bg);
  border: none;
  border-radius: 50%;
  font-size: 1.3rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  z-index: 999;
}

.sound-toggle:hover {
  transform: scale(1.1);
}

.sound-toggle.muted {
  opacity: 0.5;
}

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(10px);
  z-index: 2000;
  justify-content: center;
  align-items: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--card-bg);
  padding: 3rem;
  border-radius: var(--radius);
  text-align: center;
  max-width: 400px;
  width: 90%;
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-content h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modal-content p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.modal-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

@media (max-width: 768px) {
  .navbar {
    padding: 1rem;
  }

  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    transform: translateY(-150%);
    transition: transform 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  }

  .nav-links.active {
    transform: translateY(0);
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    padding: 3rem 1rem;
  }

  .games-grid {
    padding: 1rem;
    gap: 1.5rem;
  }

  .game-card {
    padding: 1.5rem;
  }

  .game-icon {
    font-size: 3rem;
  }

  .game-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .game-controls {
    width: 100%;
  }

  .control-btn {
    flex: 1;
    justify-content: center;
  }

  .back-home {
    bottom: 1rem;
    right: 1rem;
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
  }

  .sound-toggle {
    bottom: 1rem;
    left: 1rem;
    width: 45px;
    height: 45px;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.game-card:nth-child(1) { animation-delay: 0.1s; }
.game-card:nth-child(2) { animation-delay: 0.2s; }
.game-card:nth-child(3) { animation-delay: 0.3s; }
.game-card:nth-child(4) { animation-delay: 0.4s; }
.game-card:nth-child(5) { animation-delay: 0.5s; }