/* Global & layout */
html, body {
  margin: 0;
  padding: 0;
  background: #f7f9fc;
  color: #333;
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  height: 100%;
}

.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
header {
  background-color: #2b3a42;
  color: white;
  text-align: center;
  padding: 1em;
}

header h1 {
  margin: 0;
  font-size: 1.4em;
}

nav {
  margin-top: 0.5em;
}

nav a {
  color: #ffffff;
  margin: 0 1em;
  text-decoration: none;
}

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

/* Main */
main {
  flex: 1;
  padding: 2em 2em;
  max-width: 800px;
  margin: 0 auto;
}

.calculator {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  padding: 2em;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: 1em;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}

.calculator label {
  display: block;
  margin-top: 0.5em;
  font-weight: 500;
}

.calculator input[type="date"] {
  width: 100%;
  padding: 0.5em;
  margin-top: 0.25em;
  font-size: 1em;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.options {
  margin-top: 1em;
}

.options label {
  display: block;
  margin-top: 0.5em;
  font-size: 0.95em;
}

.options .note {
  font-size: 0.85em;
  color: #666;
  margin-left: 0.25em;
}

button {
  margin-top: 1em;
  padding: 0.75em 1.5em;
  font-size: 1em;
  background-color: #2b3a42;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  align-self: flex-start;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #1d272d;
}

/* Result */
#result {
  margin-top: 2em;
  margin-bottom: 15em;
  font-size: 0.9em;
  font-weight: bold;
  text-align: center;
  word-break: break-word;
}

/* Footer */
footer {
  background: #f7f9fc;
  text-align: center;
  padding: 1em;
  font-size: 0.7em;
  color: #2b3a42;
}

/* About & Privacy text justification */
main section p {
  text-align: justify;
}

/* Responsive breakpoints */
@media (max-width: 767px) {
  header h1 {
    font-size: 1.2em;
  }

  .calculator {
    padding: 1.5em;
    max-width: 95%;
  }

  button {
    width: 100%;
    align-self: stretch;
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  .calculator {
    max-width: 600px;
    padding: 2.5em;
  }
}

@media (min-width: 1025px) {
  .calculator {
    max-width: 500px;
  }
}