/* 🌼 Base Layout */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #fdfdfd;
  color: #333;
  line-height: 1.6;
  font-size: 16px;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* 🌄 Background Image */
.background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../images/cover-1600x2560.jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  z-index: 0;
}

/* 🌫️ Blur Overlay */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: rgba(255, 255, 255, 0.15);
  z-index: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* 📦 Wrapper */
.wrapper {
  width: 90%;
  max-width: 600px;
  margin: 0 auto;
  padding: 40px 20px;
  text-align: center;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

/* 📝 Heading */
h1 {
  font-size: clamp(26px, 5vw, 32px);
  margin-bottom: 30px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}


h1 {
  color: #ffffff;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

/* 📋 Checklist */
ul {
  list-style: none;
  width: 100%;
  max-width: 500px;
}

li {
  margin: 15px 0;
}

/* 🔘 Butang Checklist */
a {
  background-color: rgba(255, 255, 255, 0.2);
  color: #333;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-radius: 12px;
  padding: 14px 20px;
  font-size: 16px;
  width: 100%;
  display: inline-block;
  text-decoration: none;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  font-weight: 500;
}

a:hover,
a:active {
  background-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

/* 📱 Mobile Small (≤375px) */
@media screen and (max-width: 375px) {
  .wrapper {
    padding: 30px 15px;
  }
  
  h1 {
    font-size: 20px;
    margin-bottom: 25px;
  }
  
  a {
    font-size: 15px;
    padding: 12px 16px;
  }
  
  li {
    margin: 12px 0;
  }
}

/* 📱 Mobile (376px–480px) */
@media screen and (min-width: 376px) and (max-width: 480px) {
  .wrapper {
    padding: 35px 20px;
  }
  
  h1 {
    font-size: 24px;
  }
  
  a {
    font-size: 18px;
    padding: 13px 18px;
  }
}

/* 📱 Tablet Small (481px–768px) */
@media screen and (min-width: 481px) and (max-width: 768px) {
  .wrapper {
    padding: 40px 25px;
    max-width: 550px;
  }
  
  h1 {
    font-size: 28px;
    margin-bottom: 35px;
  }
  
  a {
    font-size: 17px;
    padding: 15px 22px;
  }
  
  li {
    margin: 16px 0;
  }
}

/* 💻 Desktop (769px–1199px) */
@media screen and (min-width: 769px) {
  .wrapper {
    padding: 50px 30px;
    max-width: 600px;
  }
  
  h1 {
    font-size: 32px;
    margin-bottom: 40px;
  }
  
  a {
    font-size: 18px;
    padding: 16px 24px;
  }
  
  li {
    margin: 18px 0;
  }
}

/* 🖥️ Large Desktop (≥1200px) */
@media screen and (min-width: 1200px) {
  .wrapper {
    max-width: 650px;
  }
  
  h1 {
    font-size: 34px;
  }
  
  a {
    font-size: 19px;
    padding: 17px 26px;
  }
}