/* =========================================================================
   Can I afford an EV? — design tokens

   The subject: three ways to pay for the same car (novated lease, car loan,
   cash), which this tool tracks like three lines on a Melbourne transit
   map — each gets one identity colour, used consistently everywhere that
   option appears (now: the legend; later: the crossover chart and car
   cards). Numeric readouts use a monospaced face, a nod to a station
   departure board — the numbers you actually came here for.
   ========================================================================= */

:root {
  /* Surfaces */
  --paper: #eef1ee;
  --paper-raised: #ffffff;
  --hairline: #d3d9d2;

  /* Text */
  --ink: #161b1f;
  --ink-soft: #4b5560;
  --ink-faint: #7a8480;

  /* The three "lines": novated lease, car loan, cash.
     loan and cash were re-picked together (Task 19 review, issue 4): the
     old navy (#2b5c86) and teal (#1f7a5c) sit only ~13 ΔE apart in OKLab
     under normal vision — below the 15 floor a full-colour reader needs to
     tell two hues apart — and both fall below the OKLCH chroma floor that
     keeps a colour reading as a colour rather than a gray. loan moved to a
     deeper, more saturated blue at nearly the same hue (chroma 0.087→0.115,
     L 0.461→0.441); cash moved off teal entirely to a violet
     (H 166°→302°), pushed away in hue AND lightness rather than nudged, so
     it clears both the CVD-simulated (protan/deutan, ΔE >= 11.9) and
     normal-vision (ΔE 19.8) separation floors against loan. Validated with
     dataviz's validate_palette.js — all checks pass, --pairs adjacent and
     --pairs all (winner-band segments can land adjacent in any order,
     unlike a fixed-order legend). */
  --line-lease: #b96a1e;
  --line-lease-bg: #f7e9d8;
  --line-loan: #10558f;
  --line-loan-bg: #d8e6f5;
  --line-cash: #8f59d1;
  --line-cash-bg: #e8e0f9;

  /* System */
  --warn: #9c2f22;
  --warn-bg: #f6e2de;
  --focus-ring: #2b5c86;

  /* Type */
  --font-text: 'IBM Plex Sans', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;

  /* Rhythm */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --radius: 10px;

  color-scheme: light;
}

/* =========================================================================
   Reset & base
   ========================================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, p, textarea, input, select, button {
  font-family: inherit;
}

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

button { font: inherit; }

a { color: var(--line-loan); }

/* Numeric / data readouts get the mono face throughout */
input[type='number'],
input[type='date'],
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper-raised);
  padding: var(--space-2) var(--space-3);
  border-radius: 0 0 6px 0;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* =========================================================================
   Header
   ========================================================================= */

.site-header {
  background: var(--paper-raised);
  border-bottom: 1px solid var(--hairline);
}

.site-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) var(--space-4);
}

.wordmark {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.wordmark__mark {
  color: var(--line-lease);
}

.site-header__subhead {
  margin: var(--space-1) 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  max-width: 46ch;
}

/* The route-map fragment: three lines meeting, the visual signature that
   recurs wherever the three payment options are compared. */
.route-rule {
  display: flex;
  height: 4px;
  max-width: 1200px;
  margin: 0 auto;
}

.route-rule__seg { flex: 1; }
.route-rule__seg--lease { background: var(--line-lease); }
.route-rule__seg--loan { background: var(--line-loan); }
.route-rule__seg--cash { background: var(--line-cash); }

/* =========================================================================
   Layout — mobile-first stack, three columns from 900px
   ========================================================================= */

.sections {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.sections > section {
  background: var(--paper-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: var(--space-5);
}

@media (min-width: 900px) {
  .sections {
    display: grid;
    grid-template-columns: 250px 1fr 236px;
    gap: 1rem;
    align-items: start;
  }
}

.section-heading {
  display: flex;
  /* Centred, not baseline: the step number is now a filled disc rather than
     a text-sized outline, so baseline alignment would hang it below the
     heading's cap height. */
  align-items: center;
  gap: var(--space-3);
  margin: 0 0 var(--space-4);
  font-size: 1.1rem;
  font-weight: 600;
}

/* The three steps are the app's spine — you answer 1, read 2, choose from 3 —
   so the numerals are a filled disc rather than a faint outline. Deliberately
   monochrome: the orange/blue/purple in the header rule already means
   lease/loan/cash, and reusing those hues here would imply a mapping between
   step and payment option that does not exist. */
.section-heading__eyebrow {
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  width: 1.7em;
  height: 1.7em;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  color: var(--paper-raised);
  background: var(--ink);
  border-radius: 50%;
}

/* =========================================================================
   Section 1 — about you
   ========================================================================= */

.field-group + .field-group { margin-top: var(--space-5); }

.field-group--free-text label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--space-2);
}

#free-text {
  width: 100%;
  resize: vertical;
  min-height: 8.5rem;
  padding: var(--space-3);
  border: 1px solid var(--hairline);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.5;
}

#free-text::placeholder { color: var(--ink-faint); }

#free-text:focus {
  background: var(--paper-raised);
}

.free-text__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-3);
  flex-wrap: wrap;
}

.button {
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.55em 1.1em;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
}

.button--primary {
  background: var(--ink);
  color: var(--paper-raised);
}

.button--primary:hover { background: #000; }

.parse-status {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-soft);
  min-height: 1.2em;
}

.field-group--numeric {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-soft);
  margin-bottom: var(--space-1);
}

.field__hint {
  margin: var(--space-1) 0 0;
  font-size: 0.75rem;
  line-height: 1.4;
  color: var(--ink-faint);
}

.field input,
.field select {
  width: 100%;
  padding: 0.5em 0.7em;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  background: var(--paper);
  color: var(--ink);
  font-size: 0.95rem;
}

.field select { font-family: var(--font-text); }

.field input:focus,
.field select:focus {
  background: var(--paper-raised);
}

.field__input {
  display: flex;
  align-items: center;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  background: var(--paper);
  padding-inline: 0.6em;
}

.field__input input {
  border: none;
  background: transparent;
  padding-block: 0.5em;
  padding-inline: 0.2em;
}

.field__input input:focus { outline-offset: -2px; }

.field__input:focus-within { background: var(--paper-raised); }

.field__prefix, .field__suffix {
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

/* Brief highlight used when parsing free text fills a field in, so the
   hand-off from prose to numbers is visible. */
.field-updated {
  animation: field-updated-flash 1.6s ease-out;
}

@keyframes field-updated-flash {
  0% { background-color: var(--line-lease-bg); }
  100% { background-color: transparent; }
}

/* =========================================================================
   Section 2 — what you can afford
   ========================================================================= */

.verdict-panel {
  min-height: 4rem;
}

.verdict-panel .winner {
  font-size: 1.3rem;
  font-weight: 700;
}

.verdict-panel .detail {
  margin-top: var(--space-1);
  color: var(--ink-soft);
}

.verdict-panel .totals {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.verdict-panel .total {
  display: flex;
  flex-direction: column;
  gap: 0.2em;
  padding: var(--space-3);
  border: 1px solid var(--hairline);
  border-radius: 8px;
}

.verdict-panel .total span {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.verdict-panel .total strong {
  font-family: var(--font-mono);
  font-size: 1.05rem;
}

/* The lever that would unblock an out-of-reach option. Quieter than the
   option label above it — it is a footnote to "out of reach", not a heading. */
.verdict-panel .total__blocker {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--ink-faint);
}

.verdict-panel .total.is-winner {
  border-color: var(--line-lease);
  background: var(--line-lease-bg);
}

.disclaimer {
  margin: var(--space-4) 0 0;
  padding: var(--space-3) var(--space-4);
  background: var(--paper);
  border-left: 3px solid var(--ink-faint);
  border-radius: 0 6px 6px 0;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--ink-soft);
}

.disclaimer strong { color: var(--ink); }

.fbt-caveat {
  margin: var(--space-3) 0 0;
  font-size: 0.8rem;
  color: var(--ink-soft);
  line-height: 1.5;
}

.line-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin: var(--space-5) 0 0;
  padding-top: var(--space-4);
  border-top: 1px solid var(--hairline);
}

.line-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.line-legend__dot {
  width: 0.65em;
  height: 0.65em;
  border-radius: 50%;
  display: inline-block;
}

.line-legend__dot--lease { background: var(--line-lease); }
.line-legend__dot--loan { background: var(--line-loan); }
.line-legend__dot--cash { background: var(--line-cash); }

.crossover-panel, .rates-panel {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--hairline);
  min-height: 3rem;
}

/* The one range input the design calls "the slider" — drags it and the
   verdict/chart/shortlist below recompute locally (debounced, see
   ui/app.js), with no network call. */
.budget-slider {
  margin-bottom: var(--space-4);
}

.budget-slider label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-soft);
  margin-bottom: var(--space-2);
}

.budget-slider output {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink);
}

.budget-slider input[type='range'] {
  width: 100%;
  accent-color: var(--line-lease);
}

.explanation-panel:empty {
  display: none;
}

.explanation-panel__text {
  margin: var(--space-4) 0 0;
  padding: var(--space-3) var(--space-4);
  background: var(--line-lease-bg);
  border-radius: 6px;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--ink);
}

/* =========================================================================
   Crossover chart — Task 19. Two renderings of one series, chosen in JS by
   container width at the project's 900px breakpoint:
     - desktop: three SVG lines, cost against budget.
     - mobile: a single "winner band" — three thin lines in ~96px of height
       don't read on a phone, so the whole width becomes coloured segments
       showing who's cheapest at each point on the budget slider.
   Colours match the .line-legend dots above (lease/loan/cash). Colour is
   never the only identity channel: the desktop lines also carry a stroke
   pattern (solid / dashed / dotted), and both renderings carry direct
   text labels.
   ========================================================================= */

.crossover-chart {
  width: 100%;
  height: auto;
  overflow: visible;
}

.crossover-chart .grid-line {
  stroke: var(--hairline);
  stroke-width: 1;
}

/* The vertical marker at a crossover — where the cheapest option flips.
   Dashed on purpose: this is a threshold annotation, not chart grid. */
.crossover-chart .crossover-line {
  stroke: var(--ink-faint);
  stroke-width: 1;
  stroke-dasharray: 3 3;
}

.crossover-chart .axis-label {
  fill: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 9px;
}

.crossover-chart .axis-label--crossover {
  fill: var(--ink-soft);
  font-weight: 600;
}

.crossover-chart .line {
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.crossover-chart .line-novated { stroke: var(--line-lease); }
.crossover-chart .line-loan { stroke: var(--line-loan); }
.crossover-chart .line-upfront { stroke: var(--line-cash); }

.crossover-chart .marker,
.crossover-chart .end-dot {
  stroke: var(--paper-raised);
  stroke-width: 2;
}

.crossover-chart .marker-novated,
.crossover-chart .end-dot-novated { fill: var(--line-lease); }
.crossover-chart .marker-loan,
.crossover-chart .end-dot-loan { fill: var(--line-loan); }
.crossover-chart .marker-upfront,
.crossover-chart .end-dot-upfront { fill: var(--line-cash); }

.crossover-chart .leader-line {
  stroke: var(--ink-faint);
  stroke-width: 1;
}

/* Direct end-labels render in ink, never the series colour — the adjacent
   dot carries identity, so the text itself stays legible as text. */
.crossover-chart .end-label {
  fill: var(--ink-soft);
  font-family: var(--font-text);
  font-size: 11px;
  font-weight: 600;
}

/* I7: marks where the user's own budget sits on the chart. Deliberately
   distinct from .crossover-line (which marks where the winner flips) —
   solid, not dashed, and carries a small flag at the top rather than a
   text label, so it never gets mistaken for another crossover threshold. */
.crossover-chart .budget-marker__line {
  stroke: var(--ink);
  stroke-width: 1.5;
}

.crossover-chart .budget-marker__flag {
  fill: var(--ink);
}

.winner-band {
  position: relative;
  height: 3.25rem;
  border-radius: 6px;
  overflow: hidden;
  background: var(--paper);
}

.winner-band .band {
  position: absolute;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 2px solid var(--paper-raised);
}

.winner-band .band:last-child { border-right: none; }

.winner-band .band-novated { background: var(--line-lease); }
.winner-band .band-loan { background: var(--line-loan); }
.winner-band .band-upfront { background: var(--line-cash); }

/* Issue 3: nothing affordable at any sampled budget. Deliberately neutral
   (ink-soft, not one of the three option hues) plus a diagonal hatch — a
   texture channel, not just another flat colour — so this reads as "no
   answer" rather than a fourth option. */
.winner-band .band-none {
  background:
    repeating-linear-gradient(45deg,
      rgba(255, 255, 255, 0.12) 0 6px,
      transparent 6px 12px),
    var(--ink-soft);
}

/* 1.2rem/700 clears the WCAG large-text bold threshold (14pt / 18.66px),
   which matters here: white text is ~4.1:1 on lease, ~7.7:1 on loan and
   ~4.6:1 on cash — all clear the large-text floor, none clear body-size
   (4.5:1), which is why this stays bold/large rather than shrinking. Every
   band always carries this label — a full word at >=16% width, a one- or
   two-character abbreviation (OPTION_ABBR) below that — so identity never
   depends on colour alone even for a narrow crossover sliver. */
.winner-band .band__label {
  color: #fff;
  font-size: 1.2rem;
  font-weight: 700;
  padding: 0 0.35em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* I7: same budget marker as the desktop chart's .budget-marker__line,
   expressed as an absolutely-positioned strip since the winner band isn't
   SVG. A thin light stripe plus a small triangular flag at the top reads
   over any of the three band colours. */
.winner-band__budget-marker {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: #fff;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.35);
  pointer-events: none;
}

.winner-band__budget-marker::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid #fff;
  filter: drop-shadow(0 0 1px rgba(0, 0, 0, 0.5));
}

.winner-band__scale {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
}

.rates-panel__intro {
  margin: 0 0 var(--space-4);
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.rates-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.rates-panel .rates-panel__intro {
  grid-column: 1 / -1;
}

.rate-field__provenance {
  margin: var(--space-1) 0 0;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--ink-faint);
}

.rate-field__reset {
  margin-top: var(--space-2);
  border: none;
  background: none;
  padding: 0;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--line-loan);
  cursor: pointer;
}

.rate-field__reset:hover { text-decoration: underline; }

@media (min-width: 640px) {
  .rates-panel { grid-template-columns: repeat(2, 1fr); }
}

.skeleton-note {
  margin: 0;
  color: var(--ink-faint);
  font-size: 0.85rem;
  line-height: 1.5;
}

/* =========================================================================
   Section 3 — cars that match
   ========================================================================= */

.car-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.car-card {
  padding: var(--space-3);
  border: 1px solid var(--hairline);
  border-radius: 8px;
}

.car-body h3 {
  margin: 0;
  font-size: 1rem;
}

.car-specs {
  margin: 0.2em 0 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.car-reason {
  margin: 0.3em 0 0;
  font-size: 0.82rem;
  color: var(--ink-faint);
}

.car-other-trims {
  margin: 0.2em 0 0;
  font-size: 0.78rem;
  color: var(--ink-faint);
  font-style: italic;
}

/* =========================================================================
   Sticky mobile summary bar — visible only below 900px
   ========================================================================= */

.summary-bar {
  position: sticky;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--ink);
  color: var(--paper-raised);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.12);
}

.summary-bar__arrow { color: var(--line-lease); font-weight: 700; }

@media (min-width: 900px) {
  .summary-bar { display: none; }
}

/* =========================================================================
   Footer
   ========================================================================= */

.site-footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) var(--space-6);
  color: var(--ink-soft);
  font-size: 0.8rem;
  text-align: center;
}

.site-footer p { margin: 0; }