* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
}

body {
  background-image: url("https://img.itch.zone/aW1hZ2UvMTg4NDQzNS8xMTA3MjYxNS5wbmc=/original/bVer6e.png");
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
  background-color: #87ceeb;

  font-family: Arial, sans-serif;
  text-align: center;
  padding: 16px; 
  display: flex;
  justify-content: center;
  align-items: center;
  
  min-height: 100vh;
  min-height: 100dvh;
}

.enter-card {
  width: 100%;
  max-width: 650px;
  background: rgba(220, 240, 255, 0.35);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px); 
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 20px;
  padding: 40px 30px;
  box-shadow: 
    0 0 20px rgba(186, 225, 255, 0.6), 
    inset 0 1px 2px rgba(255, 255, 255, 0.9),
    inset 0 -1px 3px rgba(100, 180, 240, 0.3);
  display: flex;
  flex-direction: column;
  align-items: center;
}

img.main-logo {
  max-width: 100%;
  width: 500px;
  height: auto;
  display: block;
  margin: 0 auto 20px auto;
  filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.7));
}

h1 {
  font-size: clamp(1.4rem, 5vw, 1.875rem); 
  text-align: center;
  font-weight: bold;
  margin-top: 0;
  margin-bottom: 30px; 
  color: #123d66; 
  text-shadow: 
    0 1px 0 rgba(255, 255, 255, 0.9),              
    0 0 10px rgba(135, 206, 250, 0.8),            
    0 0 18px rgba(30, 100, 170, 0.4);            
}

h2 {
  font-size: 1.25rem;
  color: #2b5278;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.9);
  margin: 5px 0 25px 0;
  font-weight: normal;
}

.enter-btn {
  display: inline-block;
  width: 100%;
  max-width: 200px; 
  text-decoration: none;
  color: #2b5278;
  font-weight: bold;
  font-size: 1.25rem;
  padding: 12px 0;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(200, 230, 255, 0.5) 100%);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.9);
  transition: all 0.25s ease-in-out;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.enter-btn:hover {
  color: #003a70;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(175, 215, 255, 0.8) 100%);
  border-color: #ffffff;
  box-shadow: 
    0 0 16px rgba(255, 255, 255, 0.9), 
    0 0 12px rgba(135, 206, 250, 0.8),
    0 4px 8px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

@media (max-width: 480px) {
  .enter-card {
    padding: 24px 16px; 
    border-radius: 16px;
  }

  img.main-logo {
    margin-bottom: 15px;
  }

  .enter-btn {
    max-width: 200px; 
  }
}