:root {
  --color-bg: #f0f4f8;
  --color-bg-light: #ffffff;
  --color-primary: #4A90E2;
  --color-primary-dark: #357ABD;
  --color-secondary: #F5A623;
  --color-text: #333333;
  --color-error: #e74c3c;
  --radius: 6px;
  --spacing: 1rem;
  --font: "InterDisplay", sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  padding: var(--spacing);
}

header, nav {
  background-color: var(--color-primary);
}

nav.main-nav {
  background-color: var(--color-bg-light);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.nav-container {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
}

.nav-link {
  flex: 1;
  text-align: center;
  padding: var(--spacing);
  font-size: 1rem;
  color: var(--color-text);
  text-decoration: none;
  background-color: transparent;
  transition: background-color 0.2s;
}

.nav-link:hover {
  background-color: var(--color-primary-dark);
  color: #ffffff;
}

.nav-link.active {
  background-color: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
  pointer-events: none;
}

main {
  max-width: 900px;
  margin: var(--spacing) auto;
  padding: var(--spacing);
  background: var(--color-bg-light);
  border-radius: var(--radius);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

h1, h2 {
  color: var(--color-text);
  margin-bottom: calc(var(--spacing) * 0.5);
}

h1 {
  font-size: 2rem;
  text-align: center;
  margin-bottom: var(--spacing);
}

h2 {
  font-size: 1.5rem;
  padding-bottom: 0.25rem;
  border-bottom: 2px solid #e0e0e0;
  margin-bottom: var(--spacing);
}

.form-section {
  margin-bottom: var(--spacing);
}

.form-section label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.text-input,
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #ccc;
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color 0.2s;
}

.text-input:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.parser-box,
.output-box {
  resize: vertical;
  min-height: 120px;
}

.expiry-zip-group {
  display: flex;
  gap: var(--spacing);
}

.expiry-zip-group > div {
  flex: 1;
}

.error {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

button,
.clear-btn,
.copy-btn,
.parse-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  position: relative;
  overflow: hidden;
}

.clear-btn {
  background-color: var(--color-error);
}

.clear-btn:hover {
  background-color: #c0392b;
}

button:hover,
.copy-btn:hover,
.parse-btn:hover {
  background-color: var(--color-primary-dark);
  transform: scale(1.02);
}

button:active,
.copy-btn:active,
.parse-btn:active {
  transform: scale(0.98);
}

.inline-copy {
  display: flex;
  gap: 0.5rem;
}

.radio-group {
  display: flex;
  gap: 1rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.output-container {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.output-container .output-box {
  flex: 1 1 auto;
}

.output-container .copy-btn {
  flex: 0 0 auto;
}

.copy-btn::after {
  content: "Copied!";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #28a745;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.copy-btn.copied::after {
  opacity: 1;
}

@media (max-width: 600px) {
  .expiry-zip-group {
    flex-direction: column;
  }
  .nav-container {
    flex-direction: column;
  }
}

.card-info-area {
  background-color: #d3d4d6;   
  padding: var(--spacing);    
  border-radius: var(--radius);   
  margin-bottom: var(--spacing); 
}