body {
  font-family: "Courier New", Courier, monospace;
  margin: 20px;
  background-color: #f5f5f5;
  color: #333;
}

.container {
  max-width: 950px;
  margin: 0 auto;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Base airmail letter container */
.airmail-letter {
  position: relative;
  padding: 40px;
  background-color: #fff;
  box-sizing: border-box;
  width: 100%;
  min-height: 300px;
  border: 15px solid transparent;
  background-clip: padding-box;
  font-family: "Courier New", Courier, monospace;
  color: #333;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.05);
}

/* The striped border */
.airmail-letter::before {
  content: "";
  position: absolute;
  top: -15px;
  left: -15px;
  right: -15px;
  bottom: -15px;
  z-index: -1;
  background: repeating-linear-gradient(
    45deg,
    #e53935,
    /* red */ #e53935 10px,
    white 10px,
    white 20px,
    #1e88e5,
    /* blue */ #1e88e5 30px,
    white 30px,
    white 40px
  );
}

/* Paper texture overlay */
.airmail-letter::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5z' fill='%23000000' fill-opacity='0.02' fill-rule='evenodd'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1;
  opacity: 0.8;
}

/* Letter header with postmark and stamp */
.letter-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 30px;
  border-bottom: 1px solid #ddd;
  padding-bottom: 15px;
  position: relative;
  z-index: 2;
}

/* Circular postmark */
.postmark {
  width: 100px;
  height: 100px;
  background-color: rgba(0, 0, 0, 0.05);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.postmark::before {
  content: "AIRMAIL";
  position: absolute;
  font-weight: bold;
  font-size: 12px;
  transform: rotate(-30deg);
}

.postmark::after {
  content: "";
  position: absolute;
  width: 80px;
  height: 1px;
  background-color: #333;
  transform: rotate(-30deg);
}

/* Postage stamp */
.stamp {
  width: 50px;
  height: 70px;
  background: linear-gradient(45deg, #f5f5f5, #e0e0e0);
  border: 1px solid #ccc;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  text-align: center;
  overflow: hidden;
  margin-left: 20px;
}

.stamp::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    transparent,
    transparent 3px,
    rgba(0, 0, 0, 0.05) 3px,
    rgba(0, 0, 0, 0.05) 4px
  );
}

/* Letter content styling */
.letter-content {
  line-height: 1.6;
  text-align: justify;
  position: relative;
  z-index: 2;
}

.date {
  text-align: right;
  margin-bottom: 20px;
  font-style: italic;
}

.greeting {
  margin-bottom: 20px;
}

.signature {
  margin-top: 40px;
  text-align: right;
  font-style: italic;
}

/* Media queries for responsive design */
@media screen and (max-width: 768px) {
  .airmail-letter {
    padding: 30px;
    border-width: 10px;
  }

  .airmail-letter::before {
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    background: repeating-linear-gradient(
      45deg,
      #e53935,
      #e53935 8px,
      white 8px,
      white 16px,
      #1e88e5,
      #1e88e5 24px,
      white 24px,
      white 32px
    );
  }

  .letter-header {
    flex-direction: column;
    align-items: flex-end;
  }

  .postmark {
    width: 80px;
    height: 80px;
    margin-bottom: 10px;
  }
}

@media screen and (max-width: 480px) {
  .airmail-letter {
    padding: 20px;
    border-width: 8px;
  }

  .airmail-letter::before {
    top: -8px;
    left: -8px;
    right: -8px;
    bottom: -8px;
    background: repeating-linear-gradient(
      45deg,
      #e53935,
      #e53935 6px,
      white 6px,
      white 12px,
      #1e88e5,
      #1e88e5 18px,
      white 18px,
      white 24px
    );
  }

  .postmark {
    width: 60px;
    height: 60px;
  }

  .stamp {
    width: 40px;
    height: 50px;
  }
}