:root {
  --color-primary: #1a3a5c;
  --color-secondary: #2c5f8a;
  --color-background: #f5f7fa;
  --color-card: #ffffff;
  --color-text: #1a1a1a;
  --color-text-light: #555;
  --color-success: #2e7d32;
  --color-highlight: #e3f0fc;
  --color-border: #d0d7de;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --spacing: 1.5rem;
  --radius: 6px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-background);
  line-height: 1.6;
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--spacing);
}

/* Header */

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  color: var(--color-primary);
  margin: 0 0 1rem;
  font-size: 2rem;
}

.intro-box {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing);
  text-align: left;
  max-width: 800px;
  margin: 0 auto;
}

.intro-box p {
  color: var(--color-text-light);
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
}

.intro-box p:first-child {
  font-weight: 600;
  color: var(--color-text);
}

.intro-box p + p {
  margin-top: 0.75rem;
}

.intro-box a {
  color: var(--color-secondary);
  text-decoration: underline;
}

.intro-box a:hover {
  color: var(--color-primary);
}

/* Summary */

.summary {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing);
  margin-top: 2rem;
}

.summary h2 {
  color: var(--color-primary);
  margin-top: 0;
  font-size: 1.25rem;
}

.summary-intro {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin: 0 0 0.75rem;
}

.summary-intro a {
  color: var(--color-secondary);
  text-decoration: none;
}

.summary-intro a:hover {
  text-decoration: underline;
}

.summary details {
  border-bottom: 1px solid var(--color-border);
  padding: 0.6rem 0;
}

.summary details:last-child {
  border-bottom: none;
}

.summary summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-secondary);
  padding: 0.25rem 0;
}

.summary summary:hover {
  color: var(--color-primary);
}

.summary details p {
  margin: 0.5rem 0 0.25rem 1rem;
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.summary .source {
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

.summary .source a {
  color: var(--color-secondary);
  text-decoration: none;
}

.summary .source a:hover {
  text-decoration: underline;
}

.sources-total {
  margin-top: 1rem;
  padding-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.sources-total a {
  color: var(--color-secondary);
  text-decoration: none;
}

.sources-total a:hover {
  text-decoration: underline;
}

/* Calculator Layout */

.calculator-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing);
  align-items: start;
}

@media (max-width: 768px) {
  .calculator-container {
    grid-template-columns: 1fr;
  }
}

.calculator-form,
.calculator-result {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing);
}

.calculator-result {
  position: sticky;
  top: var(--spacing);
}

.calculator-form h2,
.calculator-result h2 {
  color: var(--color-primary);
  margin-top: 0;
  font-size: 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

/* Form */

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}

.form-group input:not([type="radio"]):not([type="checkbox"]),
.form-group select {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 1rem;
  font-family: inherit;
  background: #fff;
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 2px rgba(44, 95, 138, 0.15);
}

.help-text {
  display: block;
  color: var(--color-text-light);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

fieldset.form-group {
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.75rem 1rem;
}

fieldset.form-group legend {
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0 0.4rem;
}

/* Radio / Checkbox Modules */

.module-option {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.6rem 0;
}

.module-option + .module-option {
  border-top: 1px solid #eee;
}

.module-option input[type="radio"],
.module-option input[type="checkbox"] {
  margin-top: 0.25rem;
  flex-shrink: 0;
}

.module-option label {
  cursor: pointer;
  font-weight: normal;
  line-height: 1.4;
}

.module-option .module-time {
  display: block;
  font-weight: 600;
}

.module-option .module-description {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.module-separator {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-light);
  padding: 0.75rem 0 0.25rem;
  margin-top: 0.25rem;
  border-top: 1px solid var(--color-border);
}

/* Result */

.result-placeholder {
  text-align: center;
  color: var(--color-text-light);
  padding: 2rem 1rem;
}

.hidden {
  display: none !important;
}

.notice.free-of-charge {
  background: #e8f5e9;
  border-left: 4px solid var(--color-success);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
}

.notice.free-of-charge h3 {
  color: var(--color-success);
  margin: 0 0 0.25rem;
}

.notice.free-of-charge p {
  margin: 0;
  font-size: 0.95rem;
}

.result-card {
  background: var(--color-highlight);
  border: 2px solid var(--color-secondary);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
  margin-bottom: 1.25rem;
}

.result-label {
  display: block;
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 0.25rem;
}

.result-value {
  display: block;
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.result-details h3,
#holiday-result h3 {
  font-size: 1rem;
  color: var(--color-primary);
  margin: 1rem 0 0.5rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--color-border);
}

.result-details dl,
#holiday-result dl {
  margin: 0;
}

.result-details dt,
#holiday-result dt {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 0.5rem;
}

.result-details dd,
#holiday-result dd {
  margin: 0;
  font-weight: 600;
  font-size: 0.95rem;
}

.result-details dd a {
  color: var(--color-secondary);
  text-decoration: none;
}

.result-details dd a:hover {
  text-decoration: underline;
}

.holiday-info {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin: 0.75rem 0 0;
  font-style: italic;
}

/* Footer */

footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.85rem;
}

footer p {
  margin: 0.25rem 0;
}

/* Print */

@media print {
  body {
    max-width: none;
    padding: 0;
  }
  .summary,
  .calculator-form {
    break-inside: avoid;
  }
  .calculator-result {
    position: static;
  }
}