/* ==========================================================================
   GOV.UK Design System Core Styles
   High-contrast, accessible, structured styling for educational tools.
   ========================================================================== */

:root {
  --govuk-brand-colour: #1d70b8;
  --govuk-brand-deep: #003078;
  --govuk-text-colour: #0b0c0c;
  --govuk-secondary-text-colour: #505a5f;
  --govuk-border-colour: #b1b4b6;
  --govuk-canvas-background-colour: #f8fafc;
  --govuk-focus-colour: #ffdd00;
  --govuk-focus-text-colour: #0b0c0c;
  --govuk-error-colour: #d4351c;
  --govuk-success-colour: #00703c;
  --govuk-link-colour: #1d70b8;
  --govuk-link-hover-colour: #003078;
  --govuk-link-visited-colour: #4c2c92;
  --govuk-link-active-colour: #0b0c0c;
  --govuk-font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
}

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

html {
  font-family: var(--govuk-font-family);
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background-color: var(--govuk-canvas-background-colour);
  color: var(--govuk-text-colour);
  line-height: 1.5;
  margin: 0;
  padding: 0;
}

body {
  margin: 0;
  padding: 0;
  font-size: 19px;
  line-height: 1.5;
  color: var(--govuk-text-colour);
  background-color: var(--govuk-canvas-background-colour);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Skip link */
.govuk-skip-link {
  position: absolute;
  top: -9999px;
  left: 0;
  z-index: 100;
  padding: 10px 15px;
  background-color: var(--govuk-focus-colour);
  color: var(--govuk-focus-text-colour);
  text-decoration: underline;
  font-weight: 700;
  border-radius: 0 0 6px 6px;
}
.govuk-skip-link:focus {
  top: 0;
}

/* Header - Seamless Integrated Nav Bar with Gold Accent */
.govuk-header {
  font-family: var(--govuk-font-family);
  background: linear-gradient(135deg, #002d62 0%, #1d70b8 100%);
  color: #ffffff;
  border-bottom: 3px solid #ffdd00;
  padding: 8px 0 0 0;
  box-shadow: 0 2px 8px rgba(0, 45, 98, 0.15);
}

.govuk-header__container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 15px 6px 15px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.govuk-header__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: #ffffff;
}

.govuk-header__logotype-text {
  font-size: 18px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.3px;
}

.govuk-header__service-name {
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  text-decoration: none;
}
.govuk-header__service-name:hover {
  text-decoration: underline;
}

/* Integrated Header Tabs Row (Directly Inside Top Nav Bar) */
.govuk-header__nav-row {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 15px;
  display: flex;
  align-items: flex-end;
}

.govuk-nav-tabs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: -3px; /* sits right on the yellow border */
}

.govuk-nav-tab-item {
  margin: 0;
}

.govuk-nav-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  background-color: rgba(0, 45, 98, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-bottom: 3px solid transparent;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  transition: all 0.15s ease;
}

.govuk-nav-tab:hover {
  background-color: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.govuk-nav-tab-item--selected .govuk-nav-tab {
  background-color: #f8fafc;
  color: #003078;
  border: 1px solid #ffdd00;
  border-bottom: 3px solid #f8fafc;
  font-weight: 800;
  box-shadow: 0 -2px 0 #ffdd00;
}

/* Layout width container (Zero extra top margin) */
.govuk-width-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 15px 40px 15px;
}

/* Grid system */
.govuk-grid-row {
  display: flex;
  flex-wrap: wrap;
  margin-left: -15px;
  margin-right: -15px;
}

.govuk-grid-column-full {
  flex: 0 0 100%;
  max-width: 100%;
  padding-left: 15px;
  padding-right: 15px;
}

.govuk-grid-column-two-thirds {
  flex: 0 0 66.6666%;
  max-width: 66.6666%;
  padding-left: 15px;
  padding-right: 15px;
}

.govuk-grid-column-one-third {
  flex: 0 0 33.3333%;
  max-width: 33.3333%;
  padding-left: 15px;
  padding-right: 15px;
}

.govuk-grid-column-one-half {
  flex: 0 0 50%;
  max-width: 50%;
  padding-left: 15px;
  padding-right: 15px;
}

.govuk-grid-column-one-quarter {
  flex: 0 0 25%;
  max-width: 25%;
  padding-left: 15px;
  padding-right: 15px;
}

@media (max-width: 768px) {
  .govuk-grid-column-two-thirds,
  .govuk-grid-column-one-third,
  .govuk-grid-column-one-half,
  .govuk-grid-column-one-quarter {
    flex: 0 0 100%;
    max-width: 100%;
  }
}

/* Headings */
h1, h2, h3, h4, .govuk-heading-xl, .govuk-heading-l, .govuk-heading-m, .govuk-heading-s {
  color: var(--govuk-text-colour);
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 20px;
  line-height: 1.25;
}

.govuk-heading-xl {
  font-size: 38px;
  line-height: 1.15;
}
.govuk-heading-l {
  font-size: 30px;
  line-height: 1.2;
}
.govuk-heading-m {
  font-size: 24px;
  line-height: 1.25;
}
.govuk-heading-s {
  font-size: 19px;
  line-height: 1.3;
}

.govuk-caption-xl {
  display: block;
  font-size: 22px;
  font-weight: 400;
  color: var(--govuk-secondary-text-colour);
  margin-bottom: 5px;
}

.govuk-caption-l {
  display: block;
  font-size: 18px;
  font-weight: 400;
  color: var(--govuk-secondary-text-colour);
  margin-bottom: 5px;
}

/* Paragraphs & Text */
p, .govuk-body {
  font-size: 19px;
  line-height: 1.5;
  margin-top: 0;
  margin-bottom: 20px;
}

.govuk-body-l {
  font-size: 22px;
  line-height: 1.4;
  margin-top: 0;
  margin-bottom: 20px;
}

.govuk-body-s {
  font-size: 16px;
  line-height: 1.4;
  margin-top: 0;
  margin-bottom: 15px;
}

.govuk-hint {
  font-size: 16px;
  color: var(--govuk-secondary-text-colour);
  margin-bottom: 10px;
}

/* Buttons */
/* Buttons with tactile 3D press feel */
.govuk-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 19px;
  font-weight: 700;
  line-height: 1;
  text-align: center;
  vertical-align: top;
  cursor: pointer;
  padding: 12px 24px;
  border: 2px solid transparent;
  border-radius: 8px;
  color: #ffffff;
  background-color: var(--govuk-success-colour);
  box-shadow: 0 4px 0 #004d2a;
  text-decoration: none;
  user-select: none;
  transition: all 0.1s ease;
}

.govuk-button:hover {
  background-color: #008547;
  transform: translateY(-1px);
  box-shadow: 0 5px 0 #004d2a;
}

.govuk-button:focus {
  outline: 3px solid var(--govuk-focus-colour);
  outline-offset: 2px;
}

.govuk-button:active {
  transform: translateY(3px);
  box-shadow: 0 1px 0 #004d2a;
}

.govuk-button--secondary {
  background-color: #f3f2f1;
  color: var(--govuk-text-colour);
  box-shadow: 0 4px 0 #b1b4b6;
  border: 2px solid #b1b4b6;
}
.govuk-button--secondary:hover {
  background-color: #e5e4e3;
  box-shadow: 0 5px 0 #8f9294;
}
.govuk-button--secondary:active {
  box-shadow: 0 1px 0 #b1b4b6;
}

.govuk-button--warning {
  background-color: var(--govuk-error-colour);
  box-shadow: 0 4px 0 #8a1f0d;
}
.govuk-button--warning:hover {
  background-color: #e33b20;
  box-shadow: 0 5px 0 #8a1f0d;
}
.govuk-button--warning:active {
  box-shadow: 0 1px 0 #8a1f0d;
}

.govuk-button--blue {
  background-color: var(--govuk-brand-colour);
  box-shadow: 0 4px 0 #003078;
}
.govuk-button--blue:hover {
  background-color: #1a64a4;
  box-shadow: 0 5px 0 #003078;
}
.govuk-button--blue:active {
  box-shadow: 0 1px 0 #003078;
}

.govuk-button--start {
  font-size: 22px;
  font-weight: 800;
  padding: 14px 32px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background-color: #00703c;
  box-shadow: 0 5px 0 #004d2a;
  border-radius: 10px;
}

.govuk-button--start svg {
  fill: currentColor;
}

/* Tabs */
.govuk-tabs {
  margin-top: 15px;
  margin-bottom: 30px;
}

.govuk-tabs__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-bottom: 2px solid #003078;
}

.govuk-tabs__list-item {
  margin-bottom: -2px;
}

.govuk-tabs__tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 16px;
  font-weight: 700;
  color: var(--govuk-brand-colour);
  text-decoration: none;
  background-color: #eaf3fa;
  border: 2px solid #b1b4b6;
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  transition: all 0.15s;
}

.govuk-tabs__tab:hover {
  background-color: #d8eaf8;
  transform: translateY(-1px);
}

.govuk-tabs__list-item--selected .govuk-tabs__tab {
  background-color: #1d70b8;
  color: #ffffff;
  border: 2px solid #003078;
  border-bottom: 2px solid #1d70b8;
  box-shadow: 0 -2px 0 #ffdd00;
  font-weight: 800;
}

.govuk-tabs__panel {
  padding: 14px 0 20px 0;
}
.govuk-tabs__panel--hidden {
  display: none !important;
}

/* Cards & Inset Panels */
.govuk-card {
  background-color: #ffffff;
  border: 2px solid #e1e4e8;
  border-top: 5px solid var(--govuk-brand-colour);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 25px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  transition: all 0.2s ease;
}

.govuk-card--interactive {
  transition: transform 0.15s, box-shadow 0.15s;
  cursor: pointer;
}
.govuk-card--interactive:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
  border-top-color: #003078;
}

.govuk-inset-text {
  font-family: inherit;
  font-weight: 400;
  font-size: 19px;
  line-height: 1.5;
  color: var(--govuk-text-colour);
  padding: 16px 20px;
  margin-top: 20px;
  margin-bottom: 20px;
  clear: both;
  border-left: 8px solid var(--govuk-border-colour);
  border-radius: 0 8px 8px 0;
  background-color: #f8fafc;
}

.govuk-inset-text--success {
  border-left-color: var(--govuk-success-colour);
  background-color: #e8f5ec;
}

.govuk-inset-text--info {
  border-left-color: var(--govuk-brand-colour);
  background-color: #eaf3fa;
}

.govuk-inset-text--warning {
  border-left-color: #f47738;
  background-color: #fff6ee;
}

/* Tags / Badges */
.govuk-tag {
  display: inline-block;
  padding: 4px 8px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  text-decoration: none;
  color: #ffffff;
  background-color: var(--govuk-brand-colour);
}

.govuk-tag--grey {
  background-color: #505a5f;
}
.govuk-tag--green {
  background-color: var(--govuk-success-colour);
}
.govuk-tag--red {
  background-color: var(--govuk-error-colour);
}
.govuk-tag--yellow {
  background-color: #f47738;
  color: #000000;
}
.govuk-tag--purple {
  background-color: #4c2c92;
}

/* Confirmation Panel */
.govuk-panel {
  padding: 35px 20px;
  margin-bottom: 30px;
  text-align: center;
}

.govuk-panel--confirmation {
  color: #ffffff;
  background: var(--govuk-success-colour);
}

.govuk-panel__title {
  color: inherit;
  font-size: 38px;
  font-weight: 700;
  line-height: 1.1;
  margin-top: 0;
  margin-bottom: 15px;
}

.govuk-panel__body {
  font-size: 24px;
  line-height: 1.3;
}

/* Tables */
.govuk-table {
  font-size: 19px;
  font-family: inherit;
  color: var(--govuk-text-colour);
  width: 100%;
  margin-bottom: 30px;
  border-spacing: 0;
  border-collapse: collapse;
}

.govuk-table__head {
  border-bottom: 2px solid var(--govuk-border-colour);
}

.govuk-table__header {
  font-weight: 700;
  text-align: left;
  padding: 10px 20px 10px 0;
  border-bottom: 1px solid var(--govuk-border-colour);
}

.govuk-table__cell {
  padding: 10px 20px 10px 0;
  border-bottom: 1px solid var(--govuk-border-colour);
  text-align: left;
}
.govuk-table__cell--numeric, .govuk-table__header--numeric {
  text-align: right;
  padding-right: 0;
}

/* Forms & Radios / Checkboxes */
.govuk-form-group {
  margin-bottom: 25px;
}

.govuk-label {
  font-size: 19px;
  font-weight: 700;
  color: var(--govuk-text-colour);
  display: block;
  margin-bottom: 8px;
}

.govuk-input {
  font-family: inherit;
  font-size: 24px;
  font-weight: 700;
  height: 52px;
  padding: 8px 12px;
  border: 2px solid var(--govuk-text-colour);
  border-radius: 0;
  box-sizing: border-box;
  width: 100%;
  max-width: 240px;
}
.govuk-input:focus {
  outline: 3px solid var(--govuk-focus-colour);
  outline-offset: 0;
  box-shadow: inset 0 0 0 2px var(--govuk-text-colour);
}

/* Details component */
.govuk-details {
  font-size: 19px;
  margin-bottom: 20px;
  display: block;
}

.govuk-details__summary {
  display: inline-block;
  color: var(--govuk-brand-colour);
  cursor: pointer;
  position: relative;
  margin-bottom: 10px;
  padding-left: 25px;
  font-weight: 600;
  user-select: none;
}
.govuk-details__summary:hover {
  color: #003078;
  text-decoration: underline;
}

.govuk-details__summary::before {
  content: ";
 position: absolute;
 top: 5px;
 left: 5px;
 width: 0;
 height: 0;
 border-style: solid;
 border-width: 6px 0 6px 10px;
 border-color: transparent transparent transparent currentColor;
 transform-origin: 25% 50%;
 transition: transform 0.15s;
}

details[open] > .govuk-details__summary::before {
 transform: rotate(90deg);
}

.govuk-details__text {
 padding: 15px;
 padding-left: 20px;
 border-left: 4px solid var(--govuk-border-colour);
 margin-left: 7px;
 background-color: #fafafa;
}

/* Radio chips / button groups */
.govuk-radios__items-grid {
 display: flex;
 flex-wrap: wrap;
 gap: 10px;
 margin-top: 8px;
}

.govuk-radio-chip {
 cursor: pointer;
}

.govuk-radio-chip input {
 display: none;
}

.govuk-radio-chip span {
 display: inline-block;
 padding: 10px 18px;
 background-color: #f3f2f1;
 border: 2px solid var(--govuk-border-colour);
 font-weight: 700;
 font-size: 17px;
 color: var(--govuk-text-colour);
 user-select: none;
 transition: all 0.15s;
}

.govuk-radio-chip input:checked + span {
 background-color: #1d70b8;
 color: #ffffff;
 border-color: #003078;
 box-shadow: 0 0 0 2px var(--govuk-focus-colour);
}

.govuk-radio-chip:hover span {
 background-color: #e1e0df;
}
.govuk-radio-chip input:checked:hover span {
 background-color: #003078;
}

/* Footer */
.govuk-footer {
 font-family: inherit;
 font-size: 16px;
 color: #505a5f;
 background-color: #f3f2f1;
 border-top: 1px solid var(--govuk-border-colour);
 padding: 30px 0;
 margin-top: 40px;
}

.govuk-footer__container {
 max-width: 1020px;
 margin: 0 auto;
 padding: 0 20px;
}