body {
  font-family: Arial, sans-serif;
  background: #f7f7f7;
  color: #111;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px;
}

.top-nav {
  font-size: 15px;
  margin-bottom: 20px;
}

.top-nav a {
  color: #111;
  text-decoration: none;
}

.top-nav a:hover {
  text-decoration: underline;
}

h1 {
  font-size: 36px;
  margin-bottom: 10px;
}

h2 {
  font-size: 24px;
  margin-top: 0;
}

.tagline {
  font-size: 20px;
  font-weight: bold;
  margin-top: 0;
  margin-bottom: 15px;
}

.intro {
  font-size: 17px;
  margin-bottom: 25px;
}

.calculator-box,
.content-section {
  background: #ffffff;
  border: 1px solid #ddd;
  padding: 20px;
  margin-bottom: 25px;
  border-radius: 8px;
}

.calculator-box ul {
  padding-left: 20px;
  margin: 0;
}

.calculator-box li {
  margin-bottom: 10px;
}

.calculator-box a {
  color: #111;
  text-decoration: none;
  font-weight: bold;
}

.calculator-box a:hover {
  text-decoration: underline;
}

input,
button {
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  margin-bottom: 16px;
  font-size: 16px;
  box-sizing: border-box;
}

button {
  background: #111;
  color: white;
  border: none;
  cursor: pointer;
  border-radius: 6px;
}

button:hover {
  opacity: 0.9;
}

.result {
  background: #f1f1f1;
  border-left: 4px solid #111;
  padding: 15px;
  margin-top: 20px;
  font-weight: bold;
}

label {
  font-weight: bold;
  display: block;
  margin-top: 10px;
}
.ad-space {
  background: #fafafa;
  border: 1px dashed #ccc;
  padding: 20px;
  margin: 25px 0;
  text-align: center;
  font-size: 14px;
  color: #666;
  border-radius: 8px;
}

.ad-space.small {
  min-height: 90px;
}

.ad-space.medium {
  min-height: 120px;
}

.ad-space.large {
  min-height: 250px;
}