/* ==========================================================================
   1. GOV.UK Design System Variables & Base Resets
   ========================================================================== */
:root {
  --govuk-brand-colour: #1d70b8;
  --govuk-text-colour: #0b0c0c;
  --govuk-bg-colour: #f3f2f1;
  --govuk-border-colour: #b1b4b6;
  --govuk-focus-colour: #ffdd03;
  --govuk-error-colour: #d4351c;
  --govuk-success-colour: #00703c;
  --govuk-card-bg: #ffffff;
  --govuk-font-family: "GDS Transport", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--govuk-font-family);
  color: var(--govuk-text-colour);
  background-color: var(--govuk-bg-colour);
  margin: 0;
  line-height: 1.5;
}

/* ==========================================================================
   2. Header & Top Navigation Bar (Matching HTML Structure)
   ========================================================================== */
header.site-header {
  background-color: var(--govuk-brand-colour);
  color: #ffffff;
  padding: 20px 40px;
  margin-bottom: 20px;
  border-bottom: 5px solid var(--govuk-focus-colour);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

header.site-header h1 {
  margin: 0;
  font-size: 2.2rem;
  color: #ffffff;
}

header.site-header p.sub-banner {
  margin: 5px 0 0 0;
  font-size: 1.4rem;
  font-weight: bold;
  color: #ffffff;
}

/* Navigation List horizontal alignment */
.site-nav ul {
  list-style: none;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 20px;
  margin: 0;
  padding: 0;
}

/* Override default blue/purple link styling to white 20px text */
.site-nav a,
.site-nav a:visited,
.site-nav a:link {
  color: #ffffff !important;
  text-decoration: none;
  font-size: 20px;
  font-weight: bold;
  padding: 5px 8px;
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a:focus {
  background-color: var(--govuk-focus-colour);
  color: var(--govuk-text-colour) !important;
  outline: none;
}

/* Fallback for .top-nav HTML structure if used */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background-color: var(--govuk-brand-colour);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  border-bottom: 3px solid var(--govuk-focus-colour);
  z-index: 1000;
}

.top-nav .brand {
  font-weight: bold;
  font-size: 20px;
  color: #ffffff;
  text-decoration: none;
}

.top-nav ul {
  list-style: none;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 20px;
  margin: 0;
  padding: 0;
}

.top-nav a,
.top-nav a:visited,
.top-nav a:link {
  color: #ffffff !important;
  text-decoration: none;
  font-size: 20px;
  font-weight: bold;
  padding: 5px 8px;
  white-space: nowrap;
}

.top-nav a:hover,
.top-nav a:focus {
  background-color: var(--govuk-focus-colour);
  color: var(--govuk-text-colour) !important;
  outline: none;
}

/* ==========================================================================
   3. Page Layout & Structure
   ========================================================================== */
.page-wrapper {
  width: 80%;
  margin: 0 auto;
  max-width: 1200px;
  min-width: 320px;
  background-color: var(--govuk-card-bg);
  padding: 20px 40px 40px 40px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
}

h2, h3, h4 {
  color: var(--govuk-text-colour);
}

.partner-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 25px;
}

/* ==========================================================================
   4. Form Elements & Controls
   ========================================================================== */
.form-group {
  margin-bottom: 15px;
  padding: 10px;
  border: 2px solid transparent;
  border-radius: 4px;
  transition: background-color 0.2s, border-color 0.2s;
}

.form-group:focus-within {
  border-color: var(--govuk-brand-colour);
  background-color: #f0f4f8;
}

label {
  display: block;
  font-weight: bold;
  margin-bottom: 5px;
}

input[type="text"],
select,
.currency-input {
  width: 100%;
  padding: 8px 10px;
  font-size: 1rem;
  border: 2px solid var(--govuk-border-colour);
  border-radius: 0;
  font-family: inherit;
}

input:focus, select:focus, button:focus {
  outline: 3px solid var(--govuk-text-colour);
  background-color: var(--govuk-focus-colour);
  box-shadow: 0 0 0 4px var(--govuk-focus-colour);
}

input:hover, select:hover, button:hover {
  border-color: var(--govuk-text-colour);
}

fieldset {
  border: 2px solid var(--govuk-border-colour);
  padding: 15px;
  margin-bottom: 25px;
  background-color: #fafafa;
}

legend {
  font-weight: bold;
  font-size: 1.2rem;
  padding: 0 10px;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  font-weight: normal;
}

.checkbox-group input[type="checkbox"],
.radio-group input[type="radio"] {
  width: 18px;
  height: 18px;
}

.radio-set {
  display: flex;
  gap: 15px;
  margin-top: 5px;
}

/* ==========================================================================
   5. Buttons
   ========================================================================== */
.button-container {
  display: flex;
  gap: 15px;
  margin-top: 30px;
}

.btn {
  padding: 12px 24px;
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  border: none;
  border-radius: 0;
}

.btn-submit {
  background-color: var(--govuk-success-colour);
  color: white;
}

.btn-reset {
  background-color: var(--govuk-error-colour);
  color: white;
}

.btn-pdf {
  background-color: var(--govuk-brand-colour);
  color: white;
  margin-top: 20px;
}

/* ==========================================================================
   6. Report & Output Summary Formatting
   ========================================================================== */
#reportSection {
  display: none;
  margin-top: 40px;
  padding: 25px;
  border: 3px solid var(--govuk-brand-colour);
  background-color: #ffffff;
}

.summary-box {
  background-color: #f0f4f8;
  padding: 15px;
  border-left: 5px solid var(--govuk-brand-colour);
  margin-bottom: 20px;
}

.report-date {
  font-size: 0.95rem;
  color: #555;
  margin-bottom: 15px;
}

.inputs-summary-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
  font-size: 0.95rem;
}

.inputs-summary-table th, 
.inputs-summary-table td {
  border: 1px solid var(--govuk-border-colour);
  padding: 8px 12px;
  text-align: left;
}

.inputs-summary-table th {
  background-color: #f0f4f8;
}

.inputs-summary-table tr.person-header th {
  background-color: var(--govuk-brand-colour);
  color: #ffffff;
  font-size: 1rem;
  padding: 10px 12px;
}

/* ==========================================================================
   7. Media Queries (Responsive Design)
   ========================================================================== */
@media (max-width: 900px) {
  header.site-header {
    padding: 15px 20px;
  }

  .header-container {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
  }

  .site-nav ul {
    gap: 12px;
  }

  .page-wrapper {
    width: 90%;
    padding: 20px;
  }
}

@media (max-width: 768px) {
  .site-nav {
    width: 100%;
    overflow-x: auto;
  }

  .site-nav ul {
    display: flex;
    flex-direction: row;
    gap: 10px;
  }

  .site-nav a {
    font-size: 20px;
    padding: 4px 6px;
  }

  .partner-grid {
    grid-template-columns: 1fr;
  }
  
  .page-wrapper {
    width: 95%;
    padding: 15px;
  }

  .radio-set {
    flex-direction: column;
    gap: 8px;
  }

  .button-container {
    flex-direction: column;
    gap: 10px;
  }

  .btn {
    width: 100%;
  }

  .inputs-summary-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

@media (max-width: 480px) {
  header.site-header h1 {
    font-size: 1.6rem;
  }

  header.site-header p.sub-banner {
    font-size: 1.1rem;
  }

  fieldset {
    padding: 10px;
  }
}

/* ==========================================================================
   8. Print & PDF Optimization Rules
   ========================================================================== */
@media print {
  body {
    background-color: #ffffff;
    color: #000000;
    padding-top: 0;
  }
  
  body * {
    visibility: hidden;
  }

  .top-nav, 
  header.site-header, 
  .button-container, 
  #fairCalculatorForm, 
  .btn-pdf {
    display: none !important;
  }

  .page-wrapper {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
    box-shadow: none;
  }

  #reportSection, 
  #reportSection * {
    visibility: visible;
  }

  #reportSection {
    display: block !important;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    border: none;
    padding: 0;
    margin: 0;
  }

  .summary-box, 
  .inputs-summary-table {
    page-break-inside: avoid;
  }
}