:root {
  color-scheme: light;
  --colour-ink: #0F172A;
  --colour-body: #111827;
  --colour-muted: #475569;
  --colour-primary: #0B63CE;
  --colour-primary-hover: #084C9E;
  --colour-success: #047857;
  --colour-warning: #B45309;
  --colour-error: #B91C1C;
  --colour-background: #F8FAFC;
  --colour-surface: #FFFFFF;
  --colour-border: #E2E8F0;
  --colour-border-strong: #7C8CA5;
  --colour-focus: #0B63CE;
  --colour-primary-soft: #EAF3FF;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: clamp(1.75rem, 6vw, 2.5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  --radius-sm: 0.625rem;
  --radius-md: 0.875rem;
  --radius-lg: 1rem;
  --shadow-card: 0 10px 30px rgb(15 23 42 / 0.06);
  --content-width: 72rem;
  --narrow-width: 54rem;
  --reading-width: 46rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--colour-background);
  color: var(--colour-body);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--colour-primary);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--colour-primary-hover);
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
select,
input,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--colour-focus);
  outline-offset: 3px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  color: var(--colour-ink);
  line-height: 1.15;
  text-wrap: balance;
}

h1 {
  margin-bottom: var(--space-4);
  font-size: var(--text-2xl);
  letter-spacing: -0.03em;
}

h2 {
  margin-bottom: var(--space-4);
  font-size: var(--text-xl);
}

h3 {
  margin-bottom: var(--space-2);
  font-size: var(--text-lg);
}

p:last-child {
  margin-bottom: 0;
}

.container {
  width: min(100% - 2rem, var(--content-width));
  margin-inline: auto;
}

.container--narrow {
  max-width: var(--narrow-width);
}

.container--reading {
  max-width: var(--reading-width);
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: var(--space-3);
  left: var(--space-3);
  transform: translateY(-200%);
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--colour-ink);
  color: #fff;
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid var(--colour-border);
  background: var(--colour-surface);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 4.25rem;
}

.site-nav {
  min-width: 0;
}

.site-nav__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2) var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0.35rem 0.15rem;
  color: var(--colour-ink);
  font-weight: 750;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--colour-primary-hover);
  text-decoration: underline;
  text-decoration-thickness: 0.1em;
}

.site-nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-thickness: 0.14em;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 2.75rem;
  color: var(--colour-ink);
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -0.015em;
}

.brand:hover {
  color: var(--colour-ink);
}

.brand__mark {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--colour-primary-soft);
}

.brand__mark img {
  width: 1.85rem;
  height: 1.85rem;
}

.icon-unavailable {
  background: var(--colour-primary-soft);
}

.calculator-section {
  padding-block: clamp(2rem, 7vw, 4.5rem) var(--space-7);
}

.intro {
  max-width: 43rem;
  margin-bottom: var(--space-5);
}

.eyebrow {
  margin-bottom: var(--space-2);
  color: var(--colour-primary-hover);
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.intro__lede,
.section-heading p {
  max-width: 42rem;
  color: var(--colour-muted);
  font-size: var(--text-lg);
}

.calculator-card {
  padding: clamp(1.25rem, 5vw, 2rem);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-lg);
  background: var(--colour-surface);
  box-shadow: var(--shadow-card);
}

.calculator-form {
  display: grid;
  gap: var(--space-5);
}

.field-group {
  min-width: 0;
}

.field-group label {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--colour-ink);
  font-weight: 750;
}

.field-group select,
.field-group input {
  width: 100%;
  min-height: 3rem;
  padding: 0.7rem 2.75rem 0.7rem 0.85rem;
  border: 2px solid var(--colour-border-strong);
  border-radius: var(--radius-sm);
  background: var(--colour-surface);
  color: var(--colour-body);
}

.field-group select:hover,
.field-group input:hover {
  border-color: var(--colour-primary);
}

.field-help {
  margin: var(--space-2) 0 0;
  color: var(--colour-muted);
  font-size: var(--text-sm);
}

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1rem;
  border: 0;
  border-radius: var(--radius-sm);
  font-weight: 800;
  text-align: center;
  text-decoration: none;
}

.button--primary {
  background: var(--colour-primary);
  color: #fff;
}

.button--primary:hover {
  background: var(--colour-primary-hover);
  color: #fff;
}

.support-section,
.destinations-section {
  padding-block: var(--space-7);
  border-top: 1px solid var(--colour-border);
}

.support-section {
  background: var(--colour-surface);
}

.section-heading {
  margin-bottom: var(--space-5);
}

.destination-grid,
.footer-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.destination-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  gap: var(--space-3);
}

.destination-grid a {
  display: flex;
  min-height: 3rem;
  align-items: center;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-sm);
  background: var(--colour-surface);
  color: var(--colour-ink);
  font-weight: 700;
  text-decoration: none;
}

.destination-grid a:hover {
  border-color: var(--colour-primary);
  color: var(--colour-primary-hover);
}

.site-footer {
  padding-block: var(--space-6);
  border-top: 1px solid var(--colour-border);
  background: var(--colour-ink);
  color: #fff;
}

.site-footer__inner {
  display: grid;
  gap: var(--space-4);
}

.site-footer__brand {
  margin: 0;
  font-weight: 800;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-5);
}

.site-footer a {
  color: #fff;
}

.site-footer a:hover {
  color: #fff;
  text-decoration-thickness: 0.14em;
}

.site-footer__meta {
  margin: 0;
  color: #CBD5E1;
  font-size: var(--text-sm);
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

[hidden] {
  display: none !important;
}

@media (min-width: 44rem) {
  .calculator-form {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer__inner {
    grid-template-columns: auto 1fr auto;
    align-items: center;
  }

  .footer-links {
    justify-content: center;
  }
}

@media (max-width: 35rem) {
  .site-header__inner {
    flex-wrap: wrap;
    padding-block: var(--space-2);
  }

  .brand {
    min-width: 0;
  }

  .brand__name {
    min-width: 0;
    font-size: 0.95rem;
    overflow-wrap: anywhere;
  }

  .site-nav {
    width: 100%;
    border-top: 1px solid var(--colour-border);
  }

  .site-nav__links {
    justify-content: flex-start;
    padding-top: var(--space-1);
  }

  .site-nav a {
    min-height: 2.75rem;
  }

  .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Task 21: accessible searchable country selectors */
.country-combobox {
  position: relative;
}

.country-combobox::after {
  position: absolute;
  top: 1.15rem;
  right: 1rem;
  width: 0.55rem;
  height: 0.55rem;
  border-right: 2px solid var(--colour-muted);
  border-bottom: 2px solid var(--colour-muted);
  content: "";
  pointer-events: none;
  transform: rotate(45deg);
  transform-origin: 60% 60%;
}

.country-combobox[data-expanded="true"]::after {
  transform: rotate(225deg);
}

.country-combobox input[role="combobox"] {
  padding-right: 3rem;
}

.country-combobox input[role="combobox"][disabled] {
  cursor: not-allowed;
  opacity: 0.72;
}

.country-listbox {
  position: absolute;
  z-index: 50;
  top: calc(100% + 0.35rem);
  left: 0;
  width: 100%;
  max-height: min(20rem, 45vh);
  margin: 0;
  padding: var(--space-2);
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--colour-border-strong);
  border-radius: var(--radius-sm);
  background: var(--colour-surface);
  box-shadow: 0 14px 30px rgb(15 23 42 / 0.14);
  list-style: none;
  scrollbar-gutter: stable;
}

.country-option {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 0.65rem 0.75rem;
  border: 2px solid transparent;
  border-radius: 0.5rem;
  color: var(--colour-body);
  cursor: pointer;
}

.country-option + .country-option {
  margin-top: 0.15rem;
}

.country-option[data-active="true"] {
  border-color: var(--colour-primary);
  background: var(--colour-primary-soft);
}

.country-option[aria-selected="true"] {
  font-weight: 750;
}

.country-option__name {
  min-width: 0;
  overflow-wrap: anywhere;
}

.country-option__selected {
  flex: 0 0 auto;
  color: var(--colour-muted);
  font-size: var(--text-sm);
  font-weight: 700;
}

.country-listbox__empty {
  padding: 0.7rem 0.75rem;
  color: var(--colour-muted);
}

.form-message {
  grid-column: 1 / -1;
  margin: 0;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-sm);
  font-weight: 650;
}

.form-message--error {
  border: 1px solid var(--colour-error);
  background: #FEF2F2;
  color: #7F1D1D;
}

@media (max-width: 30rem) {
  .country-listbox {
    max-height: 42vh;
  }
}

/* Task 23: production responsive calculator result UI */
.result-shell {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--colour-border);
}

.result-shell__header {
  max-width: 44rem;
}

.result-route,
.result-section-label {
  margin: 0 0 var(--space-2);
  color: var(--colour-primary-hover);
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.result-shell__header h2 {
  margin-bottom: var(--space-3);
  font-size: clamp(1.65rem, 5vw, 2.2rem);
  letter-spacing: -0.025em;
}

.result-summary {
  margin: 0;
  max-width: 42rem;
  color: var(--colour-muted);
  font-size: var(--text-lg);
}

.destination-plugs {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  background: var(--colour-background);
}

.plug-types {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: 0;
}

.plug-type {
  display: inline-grid;
  grid-template-columns: 3rem auto;
  align-items: center;
  gap: var(--space-2);
  min-width: 7.75rem;
  margin: 0;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-sm);
  background: var(--colour-surface);
  color: var(--colour-ink);
}

.plug-type__icon {
  display: grid;
  width: 3rem;
  height: 3rem;
  place-items: center;
  color: var(--colour-ink);
}

.plug-type__icon img {
  width: 3rem;
  height: 3rem;
}

.plug-type figcaption {
  min-width: 0;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.result-facts {
  display: grid;
  gap: var(--space-4);
  margin-block: var(--space-5);
}

.fact-card {
  position: relative;
  min-width: 0;
  padding: var(--space-4);
  overflow: hidden;
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  background: var(--colour-surface);
}

.fact-card::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0.25rem;
  background: var(--colour-border-strong);
  content: "";
}

.fact-card[data-tone="success"]::before {
  background: var(--colour-success);
}

.fact-card[data-tone="warning"]::before {
  background: var(--colour-warning);
}

.fact-card[data-tone="error"]::before {
  background: var(--colour-error);
}

.fact-card__heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.fact-card__heading h3,
.fact-status {
  margin: 0;
}

.fact-status {
  flex: 0 0 auto;
  color: var(--colour-ink);
  font-size: var(--text-sm);
  font-weight: 800;
  text-align: right;
}

.fact-card[data-tone="success"] .fact-status {
  color: var(--colour-success);
}

.fact-card[data-tone="warning"] .fact-status {
  color: var(--colour-warning);
}

.fact-card[data-tone="error"] .fact-status {
  color: var(--colour-error);
}

.fact-card > p:last-child {
  margin: 0;
  overflow-wrap: anywhere;
}

.result-technical {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  padding: var(--space-4) 0;
  border-block: 1px solid var(--colour-border);
}

.result-technical > div {
  min-width: 0;
  padding-inline: var(--space-4);
}

.result-technical > div:first-child {
  padding-left: 0;
}

.result-technical > div:last-child {
  padding-right: 0;
}

.result-technical > div + div {
  border-left: 1px solid var(--colour-border);
}

.result-technical dt {
  color: var(--colour-muted);
  font-size: var(--text-sm);
  font-weight: 700;
}

.result-technical dd {
  margin: var(--space-1) 0 0;
  color: var(--colour-ink);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.result-guidance-section {
  margin-top: var(--space-5);
}

.result-guidance-section h3 {
  margin-bottom: var(--space-3);
}

.result-guidance {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding-left: 1.35rem;
}

.result-guidance li {
  padding-left: 0.15rem;
}

.result-note {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border: 1px solid #D7A65A;
  border-radius: var(--radius-md);
  background: #FFF8E8;
  color: var(--colour-body);
}

.result-note h3 {
  margin-bottom: var(--space-2);
  color: #7A3F00;
}

.result-note p {
  margin-bottom: var(--space-2);
}

.result-note p:last-child {
  margin-bottom: 0;
}

.result-actions {
  margin-top: var(--space-5);
}

.button--cta {
  gap: var(--space-2);
  max-width: 100%;
}

@media (min-width: 44rem) {
  .result-shell {
    margin-top: var(--space-7);
    padding-top: var(--space-7);
  }

  .destination-plugs {
    display: grid;
    grid-template-columns: minmax(9rem, 0.35fr) minmax(0, 1fr);
    align-items: center;
    gap: var(--space-4);
  }

  .destination-plugs .result-section-label {
    margin-bottom: 0;
  }

  .result-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 35rem) {
  .result-summary {
    font-size: var(--text-base);
  }

  .plug-type {
    flex: 1 1 8rem;
    min-width: 0;
  }

  .fact-card__heading {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--space-1);
  }

  .fact-status {
    text-align: left;
  }

  .result-technical {
    grid-template-columns: 1fr;
    padding-block: var(--space-2);
  }

  .result-technical > div {
    display: grid;
    grid-template-columns: minmax(6.5rem, 0.7fr) minmax(0, 1fr);
    gap: var(--space-3);
    padding: var(--space-2) 0;
  }

  .result-technical > div + div {
    border-top: 1px solid var(--colour-border);
    border-left: 0;
  }

  .result-technical dd {
    margin-top: 0;
    text-align: right;
  }
}

@media (max-width: 23rem) {
  .calculator-card {
    padding-inline: var(--space-4);
  }

  .plug-type {
    width: 100%;
  }

  .result-technical > div {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .result-technical dd {
    margin-top: var(--space-1);
    text-align: left;
  }
}

.button--cta {
  width: 100%;
  overflow-wrap: anywhere;
}

@media (min-width: 44rem) {
  .button--cta {
    width: auto;
  }
}

/* Task 25: shared navigation and utility-page shells */
.utility-page {
  padding-block: clamp(2rem, 7vw, 4.5rem) var(--space-7);
}

.utility-page__content {
  max-width: var(--reading-width);
}

.utility-page__notice {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  background: var(--colour-surface);
}

/* Task 24: reusable destination guide pages */
.destination-guide {
  padding-block: clamp(1.75rem, 6vw, 4rem) var(--space-7);
}

.back-to-calculator {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  margin-bottom: var(--space-4);
  font-weight: 750;
  text-decoration: none;
}

.back-to-calculator:hover {
  text-decoration: underline;
  text-decoration-thickness: 0.1em;
}

.destination-guide__header {
  max-width: 48rem;
  margin-bottom: var(--space-5);
}

.destination-answer-card {
  padding: clamp(1.25rem, 5vw, 2rem);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-lg);
  background: var(--colour-surface);
  box-shadow: var(--shadow-card);
}

.destination-answer-card__facts {
  margin-bottom: var(--space-5);
}

.destination-plug-route {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  background: var(--colour-background);
}

.destination-plug-route > h3 {
  margin-bottom: var(--space-4);
}

.plug-route {
  display: grid;
  grid-template-columns: minmax(0, auto) auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-3);
}

.plug-route__origin {
  display: grid;
  justify-items: center;
  gap: var(--space-2);
  min-width: 6.5rem;
  margin: 0;
  padding: 0.75rem;
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-sm);
  background: var(--colour-surface);
  color: var(--colour-ink);
  font-weight: 800;
  text-align: center;
}

.plug-route__icon {
  display: grid;
  width: 4rem;
  height: 4rem;
  place-items: center;
}

.plug-route__icon img {
  width: 4rem;
  height: 4rem;
}

.plug-route__arrow {
  color: var(--colour-muted);
  font-size: 1.5rem;
  font-weight: 800;
}

.plug-route__destinations {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  min-width: 0;
}

.plug-route__destinations .plug-type {
  flex: 1 1 8rem;
}

.destination-answer-card .result-technical {
  margin-top: var(--space-5);
}

.destination-cta {
  margin-top: var(--space-5);
}

.destination-section,
.destination-note,
.destination-related {
  margin-top: var(--space-6);
}

.destination-section {
  padding-top: var(--space-6);
  border-top: 1px solid var(--colour-border);
}

.destination-section > p {
  max-width: var(--reading-width);
}

.destination-note h2 {
  margin-bottom: var(--space-2);
  color: #7A3F00;
}

.faq-list {
  display: grid;
  gap: var(--space-3);
}

.faq-item {
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-sm);
  background: var(--colour-surface);
}

.faq-item summary {
  min-height: 3rem;
  padding: 0.85rem 2.75rem 0.85rem 1rem;
  color: var(--colour-ink);
  font-weight: 800;
  cursor: pointer;
}

.faq-item__answer {
  padding: 0 1rem 1rem;
  color: var(--colour-body);
}

.faq-item__answer p {
  margin: 0;
}

.destination-grid--compact {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 10.5rem), 1fr));
}

.destination-related__calculator {
  margin-top: var(--space-4);
  font-weight: 750;
}

@media (max-width: 35rem) {
  .plug-route {
    grid-template-columns: 1fr;
  }

  .plug-route__origin {
    justify-self: stretch;
  }

  .plug-route__arrow {
    justify-self: center;
    transform: rotate(90deg);
  }

  .plug-route__destinations {
    width: 100%;
  }

  .destination-answer-card .button {
    width: 100%;
  }
}

/* Task 33: monetisation disclosure is injected only when an affiliate CTA is live. */
.monetisation-disclosure {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--colour-text-muted);
  font-size: var(--text-sm);
  font-weight: 750;
  letter-spacing: 0.02em;
}