/* Base */
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f9f9f9;
  color: #333;
  line-height: 1.6;
}

/* Header */
header{
  background:#ff4d6d;
  color:#fff;
  padding: clamp(16px, 5vw, 40px) clamp(12px, 4vw, 20px);
  text-align:center;
  position: relative; /* for #closeBtn */
}
header h1{
  margin: 0;
  font-size: clamp(22px, 4.6vw, 32px);
  line-height: 1.2;
}

/* Title accent */
.title{
  color: red;
  font-weight: 900;
  font-size: clamp(24px, 5vw, 36px);
  letter-spacing: clamp(.3px, .4vw, 2px);
}

/* Main */
main{
  max-width: clamp(700px, 92vw, 900px);
  margin: clamp(20px, 6vw, 40px) auto;
  padding: 0 clamp(12px, 4.5vw, 20px);
  line-height: 1.65;
}

/* Headings */
h2{
  margin-top: clamp(16px, 5vw, 30px);
  color:#222;
  border-bottom: 2px solid #ddd;
  padding-bottom: clamp(4px, 1.2vw, 8px);
  font-size: clamp(18px, 3.6vw, 26px);
  line-height: 1.25;
}

/* Lists */
ul{ padding-left: clamp(14px, 3.5vw, 20px); }
li{ margin-bottom: clamp(6px, 2vw, 10px); }

/* Footer */
footer{
  text-align:center;
  padding: clamp(16px, 5vw, 30px);
  font-size: clamp(13px, 1.9vw, 15px);
  color:#777;
  margin-top: clamp(24px, 6vw, 40px);
}

/* Close button */
#closeBtn{
  position: absolute;
  top: clamp(6px, 2.5vw, 10px);
  right: clamp(10px, 5vw, 20px);
  font-size: clamp(16px, 4.2vw, 20px);
  background: transparent;
  border: none;
  cursor: pointer;
}