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

body {
  font-family: 'Lato', sans-serif;
  line-height: 1.7;
  color: #333;
  background: linear-gradient(135deg, #e0f7fa 0%, #b2ebf2 100%);
}

/* Age Prompt */
.age-prompt {
  display: none;
  position: fixed;
  z-index: 999999;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.90);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.age-prompt.show {
  display: flex;
}

.prompt-box {
  background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
  padding: 50px;
  border-radius: 20px;
  max-width: 550px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 188, 212, 0.3);
  border: 3px solid #00bcd4;
}

.prompt-crystal {
  font-size: 4.5rem;
  margin-bottom: 20px;
}

.prompt-box h2 {
  font-family: 'Cinzel', serif;
  font-size: 2.2rem;
  margin-bottom: 20px;
  color: #00838f;
}

.prompt-box p {
  font-size: 1.1rem;
  margin-bottom: 15px;
  color: #555;
}

.prompt-notice {
  font-weight: 600;
  color: #00838f;
}

.prompt-actions {
  display: flex;
  gap: 15px;
  justify-content: center;
  margin-top: 30px;
  flex-wrap: wrap;
}

.action-confirm, .action-deny {
  padding: 15px 35px;
  border: none;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: 'Lato', sans-serif;
}

.action-confirm {
  background: linear-gradient(135deg, #00bcd4 0%, #0097a7 100%);
  color: white;
}

.action-confirm:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 188, 212, 0.4);
}

.action-deny {
  background: transparent;
  color: #00838f;
  border: 2px solid #00838f;
}

.action-deny:hover {
  background: rgba(0, 131, 143, 0.1);
}

/* Page Layout */
.page-layout {
  display: flex;
  min-height: 100vh;
}

/* Side Navigation */
.side-nav {
  width: 260px;
  background: linear-gradient(180deg, #006064 0%, #00838f 100%);
  padding: 40px 0;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  box-shadow: 3px 0 15px rgba(0, 0, 0, 0.15);
  z-index: 1000;
}

.nav-brand {
  padding: 0 30px 30px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  font-size: 2.5rem;
}

.brand-text {
  font-family: 'Cinzel', serif;
  font-size: 1.8rem;
  color: white;
  font-weight: 700;
}

.nav-menu {
  padding: 30px 0;
  display: flex;
  flex-direction: column;
}

.menu-item {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  padding: 16px 30px;
  transition: all 0.3s ease;
  font-weight: 500;
  border-left: 4px solid transparent;
  font-size: 1.05rem;
}

.menu-item:hover, .menu-item.active {
  background: rgba(255, 255, 255, 0.15);
  border-left-color: #00bcd4;
  color: white;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 10000;
  background: #00838f;
  border: none;
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  box-shadow: 0 3px 15px rgba(0, 0, 0, 0.2);
}

.mobile-nav-toggle span {
  width: 25px;
  height: 3px;
  background: white;
  border-radius: 3px;
  transition: 0.3s;
}

/* Main Area */
.main-area {
  margin-left: 260px;
  flex: 1;
  min-height: 100vh;
}

/* Banner Section */
.banner-section, .page-banner, .legal-banner {
  background: linear-gradient(135deg, #00838f 0%, #006064 100%);
  padding: 100px 50px;
  text-align: center;
  color: white;
}

.banner-content h1, .banner-inner h1 {
  font-family: 'Cinzel', serif;
  font-size: 3.5rem;
  margin-bottom: 20px;
  font-weight: 700;
}

.banner-description {
  font-size: 1.4rem;
  margin-bottom: 40px;
  opacity: 0.95;
}

.banner-cta {
  display: inline-block;
  background: white;
  color: #00838f;
  padding: 18px 45px;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1.2rem;
  transition: all 0.3s ease;
  box-shadow: 0 5px 25px rgba(0, 0, 0, 0.2);
}

.banner-cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.banner-inner p, .date-stamp {
  font-size: 1.2rem;
  opacity: 0.95;
}

/* Sections */
section {
  padding: 80px 50px;
}

.intro-container, .info-container, .game-container-outer, .advantages-container, .guide-container, .legal-container {
  max-width: 1100px;
  margin: 0 auto;
}

/* Introduction */
.introduction {
  background: white;
}

.introduction h2 {
  font-family: 'Cinzel', serif;
  font-size: 2.8rem;
  color: #00838f;
  margin-bottom: 30px;
}

.introduction p {
  font-size: 1.15rem;
  margin-bottom: 20px;
  color: #555;
}

/* Key Information */
.key-information {
  background: rgba(224, 247, 250, 0.5);
}

.key-information h2 {
  font-family: 'Cinzel', serif;
  font-size: 2.8rem;
  color: #00838f;
  margin-bottom: 50px;
  text-align: center;
}

.info-panels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.info-panel {
  padding: 40px;
  border-radius: 15px;
  color: white;
  box-shadow: 0 5px 25px rgba(0, 0, 0, 0.15);
  transition: transform 0.3s ease;
}

.info-panel:hover {
  transform: translateY(-8px);
}

.cyan-panel {
  background: linear-gradient(135deg, #00bcd4 0%, #0097a7 100%);
}

.teal-panel {
  background: linear-gradient(135deg, #009688 0%, #00796b 100%);
}

.blue-panel {
  background: linear-gradient(135deg, #0288d1 0%, #01579b 100%);
}

.panel-emoji {
  font-size: 3rem;
  display: block;
  margin-bottom: 20px;
}

.info-panel h3 {
  font-family: 'Cinzel', serif;
  font-size: 1.7rem;
  margin-bottom: 15px;
}

.info-panel p {
  font-size: 1.05rem;
  line-height: 1.7;
}

/* Featured Game */
.featured-game {
  background: white;
}

.featured-game h2 {
  font-family: 'Cinzel', serif;
  font-size: 2.8rem;
  color: #00838f;
  margin-bottom: 20px;
  text-align: center;
}

.game-intro {
  text-align: center;
  font-size: 1.15rem;
  margin-bottom: 35px;
  color: #555;
}

.game-frame-wrapper {
  background: #000;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
}

.game-iframe {
  width: 100%;
  height: 600px;
  border: none;
  display: block;
}

/* Platform Advantages */
.platform-advantages {
  background: rgba(224, 247, 250, 0.5);
}

.platform-advantages h2 {
  font-family: 'Cinzel', serif;
  font-size: 2.8rem;
  color: #00838f;
  margin-bottom: 50px;
  text-align: center;
}

.advantage-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 25px;
}

.advantage-card {
  background: white;
  padding: 35px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  text-align: center;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.advantage-card:hover {
  transform: translateY(-8px);
  border-color: #00bcd4;
  box-shadow: 0 8px 30px rgba(0, 188, 212, 0.2);
}

.card-emoji {
  font-size: 2.8rem;
  margin-bottom: 15px;
}

.advantage-card h3 {
  font-family: 'Cinzel', serif;
  font-size: 1.5rem;
  color: #00838f;
  margin-bottom: 12px;
}

.advantage-card p {
  font-size: 1.05rem;
  color: #555;
}

/* Gameplay Guide */
.gameplay-guide {
  background: white;
}

.gameplay-guide h2 {
  font-family: 'Cinzel', serif;
  font-size: 2.5rem;
  color: #00838f;
  margin-bottom: 25px;
}

.gameplay-guide p {
  font-size: 1.1rem;
  margin-bottom: 18px;
  color: #555;
}

/* Legal Section */
.legal-section {
  background: white;
}

.legal-container h2 {
  font-family: 'Cinzel', serif;
  font-size: 2rem;
  color: #00838f;
  margin-top: 40px;
  margin-bottom: 18px;
}

.legal-container p, .legal-container li {
  font-size: 1.05rem;
  margin-bottom: 15px;
  color: #555;
}

.legal-container ul {
  margin-left: 30px;
  margin-bottom: 20px;
}

/* Footer */
.site-footer-area {
  background: linear-gradient(135deg, #006064 0%, #004d40 100%);
  padding: 60px 50px 30px;
  color: white;
}

.footer-content-wrap {
  max-width: 1100px;
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 30px;
}

.footer-section h4 {
  font-family: 'Cinzel', serif;
  font-size: 1.6rem;
  margin-bottom: 15px;
}

.footer-section p {
  margin-bottom: 15px;
  opacity: 0.9;
}

.resource-list, .legal-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.resource-list a, .legal-list a {
  color: #80deea;
  text-decoration: none;
  transition: opacity 0.3s ease;
}

.resource-list a:hover, .legal-list a:hover {
  opacity: 0.7;
}

.footer-copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: 20px;
  text-align: center;
  opacity: 0.85;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .mobile-nav-toggle {
    display: flex;
  }
  
  .side-nav {
    left: -260px;
    transition: left 0.3s ease;
  }
  
  .side-nav.open {
    left: 0;
  }
  
  .main-area {
    margin-left: 0;
  }
  
  .banner-section, .page-banner, .legal-banner, section {
    padding: 50px 20px;
  }
  
  .banner-content h1, .banner-inner h1 {
    font-size: 2.5rem;
  }
  
  .banner-description {
    font-size: 1.1rem;
  }
  
  .introduction h2, .key-information h2, .featured-game h2, .platform-advantages h2 {
    font-size: 2.2rem;
  }
  
  .game-iframe {
    height: 400px;
  }
  
  .info-panels, .advantage-cards {
    grid-template-columns: 1fr;
  }
  
  .prompt-box, .intro-container, .guide-container, .legal-container {
    padding: 30px 20px;
  }
}