/* ==========================================================================
   IAVTA.org Design System
   Dark blue + gold automotive palette
   ========================================================================== */

@font-face {
  font-family: 'Inter Fallback';
  src: local('Arial');
  size-adjust: 107%;
  ascent-override: 90%;
  descent-override: 22%;
  line-gap-override: 0%;
}

:root {
  --ia-dark:       #0d1b2a;
  --ia-navy:       #1b3a5c;
  --ia-mid:        #2b5278;
  --ia-blue:       #4a90d9;
  --ia-light-blue: #6db3f2;
  --ia-gold:       #d4a843;
  --ia-gold-light: #e8c76a;
  --ia-bg:         #f0f4f8;
  --ia-card:       #ffffff;
  --ia-text:       #1a1a2e;
  --ia-text-sec:   #555;
  --ia-muted:      #888;
  --ia-border:     #dde2e8;
  --ia-radius:     10px;
  --ia-shadow:     0 1px 4px rgba(0,0,0,.06), 0 2px 8px rgba(0,0,0,.04);
  --ia-shadow-lg:  0 4px 20px rgba(0,0,0,.10);
  --ia-max-w:      1200px;
  --ia-font:       'Inter', 'Inter Fallback', system-ui, -apple-system, sans-serif;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--ia-font);
  background: var(--ia-bg);
  color: var(--ia-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Layout */
.ia-wrap { max-width: var(--ia-max-w); margin: 0 auto; padding: 0 20px; }

/* Nav */
.ia-nav {
  background: var(--ia-dark);
  border-bottom: 3px solid var(--ia-gold);
  position: sticky; top: 0; z-index: 100;
}
.ia-nav:empty { display: block; min-height: 75px; }
.ia-nav-inner {
  max-width: var(--ia-max-w); margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.ia-logo {
  color: #fff; font-size: 1.4rem; font-weight: 700; text-decoration: none;
  letter-spacing: 1.5px; display: flex; align-items: center; gap: 10px;
}
.ia-logo-seal { height: 44px; width: 44px; flex-shrink: 0; }
.ia-nav-links { display: flex; gap: 24px; list-style: none; }
.ia-nav-links a {
  color: rgba(255,255,255,.85); text-decoration: none; font-size: .9rem;
  font-weight: 500; transition: color .2s;
}
.ia-nav-links a:hover, .ia-nav-links a.active { color: var(--ia-gold); }

/* Mobile nav toggle */
.ia-nav-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; }

/* Hero */
.ia-hero {
  background: linear-gradient(135deg, rgba(13,27,42,.82) 0%, rgba(27,58,92,.78) 100%),
              url('/img/hero-freeway.webp') center/cover no-repeat;
  color: #fff; padding: 60px 20px; text-align: center;
}
.ia-hero h1 {
  font-size: 2.4rem; font-weight: 700; margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.ia-hero p { color: rgba(255,255,255,.8); font-size: 1.15rem; max-width: 640px; margin: 0 auto 24px; }

/* Search box */
.ia-search-wrap {
  max-width: 520px; margin: 0 auto; position: relative;
}
.ia-search {
  width: 100%; padding: 14px 48px 14px 18px;
  border: 2px solid rgba(255,255,255,.3); border-radius: var(--ia-radius);
  background: #fff; color: var(--ia-text);
  font-size: 1rem; outline: none; transition: border-color .2s, box-shadow .2s;
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}
.ia-search::placeholder { color: var(--ia-muted); }
.ia-search:focus { border-color: var(--ia-gold); box-shadow: 0 2px 12px rgba(0,0,0,.25); }
.ia-search-icon {
  position: absolute; right: 16px; top: 50%; transform: translateY(-50%);
  color: var(--ia-muted); font-size: 1.1rem;
}
.ia-search-results {
  position: absolute; top: 100%; left: 0; right: 0;
  background: #fff; border-radius: 0 0 var(--ia-radius) var(--ia-radius);
  box-shadow: var(--ia-shadow-lg); max-height: 320px; overflow-y: auto;
  display: none; z-index: 50;
}
.ia-search-results.active { display: block; }
.ia-search-result {
  display: block; padding: 12px 18px; color: var(--ia-text);
  text-decoration: none; border-bottom: 1px solid var(--ia-border);
  transition: background .15s;
}
.ia-search-result:hover { background: var(--ia-bg); }
.ia-search-result-make { font-weight: 600; }
.ia-search-result-detail { font-size: .85rem; color: var(--ia-muted); }

/* Cards */
.ia-card {
  background: var(--ia-card); border-radius: var(--ia-radius);
  box-shadow: var(--ia-shadow); padding: 24px; margin-bottom: 20px;
}
.ia-card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px; flex-wrap: wrap; gap: 12px;
}
.ia-card-title { font-size: 1.15rem; font-weight: 700; color: var(--ia-text); }

/* Stat cards */
.ia-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin: 24px 0; }
.ia-stat {
  background: var(--ia-card); border-radius: var(--ia-radius);
  box-shadow: var(--ia-shadow); padding: 20px; text-align: center;
}
.ia-stat-label { font-size: .8rem; text-transform: uppercase; letter-spacing: .5px; color: var(--ia-muted); margin-bottom: 4px; }
.ia-stat-value { font-size: 1.5rem; font-weight: 700; color: var(--ia-navy); }
.ia-stat-value .gold, .ia-stat-value.gold { color: var(--ia-gold); }
.ia-stat-detail { font-size: .8rem; color: var(--ia-text-sec); margin-top: 4px; }

/* Chart area */
.ia-chart-card {
  background: var(--ia-card); border-radius: var(--ia-radius);
  box-shadow: var(--ia-shadow); padding: 16px 20px; margin: 24px 0;
}
.ia-chart-controls {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 10px; margin-bottom: 10px;
}
.ia-chart-wrap { position: relative; height: 380px; }
.ia-chart-wrap canvas { width: 100% !important; height: 100% !important; }

/* Toggle group */
.ia-toggle {
  display: inline-flex; border: 2px solid var(--ia-navy); border-radius: 8px; overflow: hidden; flex-shrink: 0;
}
.ia-toggle-btn {
  padding: 6px 16px; border: none; background: transparent;
  color: var(--ia-navy); font-weight: 600; font-size: .82rem;
  cursor: pointer; transition: all .2s;
}
.ia-toggle-btn.active { background: var(--ia-navy); color: #fff; }
.ia-toggle-btn:not(:last-child) { border-right: 1px solid var(--ia-navy); }

/* Dropdown with checkboxes */
.ia-dropdown-wrap { position: relative; flex-shrink: 0; }
.ia-dropdown-btn {
  padding: 6px 14px; border: 2px solid var(--ia-border); border-radius: 8px;
  background: #fff; cursor: pointer; font-size: .82rem; font-weight: 500;
  display: flex; align-items: center; gap: 5px; color: var(--ia-text);
  white-space: nowrap;
}
.ia-dropdown-btn::after { content: '▾'; font-size: .7rem; }
.ia-dropdown-panel {
  position: absolute; top: 100%; left: 0; min-width: 220px;
  background: #fff; border: 1px solid var(--ia-border); border-radius: var(--ia-radius);
  box-shadow: var(--ia-shadow-lg); padding: 8px 0; display: none; z-index: 40;
  max-height: 320px; overflow-y: auto;
}
.ia-dropdown-panel.open { display: block; }
.ia-dropdown-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px; cursor: pointer; font-size: .85rem;
  transition: background .15s;
}
.ia-dropdown-item:hover { background: var(--ia-bg); }
.ia-dropdown-item input[type="checkbox"] { accent-color: var(--ia-navy); }
.ia-dropdown-item.disabled { opacity: .5; cursor: not-allowed; }
.ia-dropdown-item.disabled input { pointer-events: none; }

/* Chart legend */
.ia-legend { display: flex; flex-wrap: wrap; gap: 10px 16px; margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--ia-border); justify-content: center; }
.ia-legend-item { display: flex; align-items: center; gap: 5px; font-size: .78rem; color: var(--ia-text-sec); }
.ia-legend-swatch { width: 18px; height: 3px; border-radius: 2px; }

/* Chart reading guide */
.ia-chart-guide {
  background: var(--ia-card); border-radius: var(--ia-radius);
  box-shadow: var(--ia-shadow); padding: 20px 24px; margin: 16px 0 0;
  font-size: .88rem; color: var(--ia-text-sec); line-height: 1.7;
}
.ia-chart-guide ul { list-style: none; padding: 0; margin: 0; }
.ia-chart-guide li { padding: 4px 0 4px 20px; position: relative; }
.ia-chart-guide li::before {
  content: '\2022'; position: absolute; left: 0;
  color: var(--ia-gold); font-weight: 700;
}
.ia-chart-guide-mission {
  margin: 12px 0 0; padding-top: 12px;
  border-top: 1px solid var(--ia-border);
  font-size: .82rem; color: var(--ia-muted);
}

/* Summary */
.ia-summary { font-size: 1rem; color: var(--ia-text-sec); line-height: 1.7; min-height: 24px; margin: 16px 0; }

/* Tables */
.ia-table-wrap { overflow-x: auto; }
.ia-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.ia-table th { background: var(--ia-bg); font-weight: 600; text-align: left; padding: 10px 12px; border-bottom: 2px solid var(--ia-border); }
.ia-table td { padding: 10px 12px; border-bottom: 1px solid var(--ia-border); }
.ia-table tbody tr:hover { background: #f8fafc; }

/* Photo cards */
.ia-photo-card { overflow: hidden; padding: 0; }
.ia-photo-card img {
  width: 100%; height: 180px; object-fit: cover; display: block;
}
.ia-photo-card .ia-photo-card-body { padding: 20px; }

/* Sections */
.ia-section { margin: 32px 0; }
.ia-section-title { font-size: 1.3rem; font-weight: 700; margin-bottom: 16px; color: var(--ia-dark); }

/* Comparison selectors */
.ia-compare-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; margin-bottom: 24px; }
.ia-compare-select {
  padding: 10px 14px; border: 2px solid var(--ia-border); border-radius: var(--ia-radius);
  font-size: .9rem; width: 100%; background: #fff;
}

/* Footer */
.ia-footer {
  background: var(--ia-dark); color: rgba(255,255,255,.6); padding: 40px 20px;
  margin-top: auto; text-align: center; font-size: .85rem;
}
.ia-footer:empty { display: block; min-height: 120px; }
.ia-footer a { color: var(--ia-gold); text-decoration: none; }

/* Badges */
.ia-badge {
  display: inline-block; padding: 3px 10px; border-radius: 4px;
  font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .5px;
}
.ia-badge-estimated { background: #fff3cd; color: #856404; }
.ia-badge-verified { background: #d4edda; color: #155724; }

/* Inferred MPG tag */
.ia-tag-inferred {
  display: inline-flex; align-items: center; gap: 3px;
  padding: 1px 7px; border-radius: 4px;
  background: #e9ecef; color: #6c757d;
  font-size: .7rem; font-weight: 600; letter-spacing: .3px;
  cursor: help; position: relative; white-space: nowrap;
  vertical-align: middle; line-height: 1.6;
}
.ia-tag-inferred::after {
  content: attr(data-tip);
  position: absolute; top: calc(100% + 8px); right: 0;
  background: var(--ia-dark); color: #fff; font-size: .75rem; font-weight: 400;
  padding: 10px 14px; border-radius: 6px; white-space: normal; width: 260px;
  line-height: 1.5; pointer-events: none; opacity: 0; transition: opacity .15s;
  z-index: 30; text-align: left;
}
.ia-tag-inferred:hover::after, .ia-tag-inferred.active::after { opacity: 1; }

/* Rankings list */
.ia-rank-list { list-style: none; }
.ia-rank-item {
  display: flex; align-items: center; gap: 16px; padding: 14px 0;
  border-bottom: 1px solid var(--ia-border);
}
.ia-rank-num {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--ia-navy); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .9rem; flex-shrink: 0;
}
.ia-rank-item:nth-child(1)  .ia-rank-num { background: #0d1b2a; }
.ia-rank-item:nth-child(2)  .ia-rank-num { background: #142640; }
.ia-rank-item:nth-child(3)  .ia-rank-num { background: #1b3156; }
.ia-rank-item:nth-child(4)  .ia-rank-num { background: #223c6c; }
.ia-rank-item:nth-child(5)  .ia-rank-num { background: #294782; }
.ia-rank-item:nth-child(6)  .ia-rank-num { background: #305298; }
.ia-rank-item:nth-child(7)  .ia-rank-num { background: #375dae; }
.ia-rank-item:nth-child(8)  .ia-rank-num { background: #3e68c4; }
.ia-rank-item:nth-child(9)  .ia-rank-num { background: #4573d0; }
.ia-rank-item:nth-child(10) .ia-rank-num { background: #4a7eda; }
.ia-rank-info { flex: 1; }
.ia-rank-name { font-weight: 600; }
.ia-rank-name a { color: var(--ia-text); text-decoration: none; }
.ia-rank-name a:hover { color: var(--ia-blue); }
.ia-rank-detail { font-size: .85rem; color: var(--ia-muted); }
.ia-rank-cpmr { font-weight: 700; color: var(--ia-navy); font-size: 1.1rem; white-space: nowrap; }

/* Page header breadcrumb */
.ia-breadcrumb { padding: 16px 0; font-size: .85rem; color: var(--ia-muted); }
.ia-breadcrumb a { color: var(--ia-blue); text-decoration: none; }

/* Cost breakdown ledger */
.ia-ledger { margin: 28px 0; }
.ia-ledger-title { font-size: 1.2rem; font-weight: 700; color: var(--ia-dark); margin-bottom: 16px; }

.ia-ledger-controls {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 20px;
}
.ia-ledger-year-select {
  padding: 10px 14px; border: 2px solid var(--ia-navy); border-radius: 8px;
  font-size: .95rem; font-weight: 600; background: #fff; color: var(--ia-navy);
  cursor: pointer; min-width: 140px;
}
.ia-ledger-year-select:focus { outline: none; border-color: var(--ia-gold); }

.ia-ledger-columns {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
}

.ia-ledger-col {
  background: var(--ia-card); border-radius: var(--ia-radius);
  box-shadow: var(--ia-shadow);
}
.ia-ledger-col-header { border-radius: var(--ia-radius) var(--ia-radius) 0 0; }

.ia-ledger-col-header {
  padding: 12px 16px; background: var(--ia-bg); border-bottom: 2px solid var(--ia-border);
}
.ia-ledger-col-header select {
  width: 100%; padding: 6px 8px; border: 1px solid var(--ia-border); border-radius: 6px;
  font-size: .85rem; font-weight: 600; background: #fff; color: var(--ia-text);
  cursor: pointer;
}
.ia-ledger-col-header select:focus { outline: none; border-color: var(--ia-gold); }
.ia-ledger-col-header-label {
  font-size: .7rem; text-transform: uppercase; letter-spacing: .5px;
  color: var(--ia-muted); margin-bottom: 4px;
}

.ia-ledger-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 12px 16px; border-bottom: 1px solid #f0f2f5; transition: opacity .2s;
}
.ia-ledger-row:last-child { border-bottom: none; }
.ia-ledger-row:hover { background: #fafbfc; }

.ia-ledger-row.excluded {
  opacity: 0.4; text-decoration: line-through; text-decoration-color: var(--ia-muted);
}

.ia-ledger-row-label {
  display: flex; align-items: center; gap: 6px;
  font-size: .88rem; font-weight: 500; color: var(--ia-text); flex-shrink: 0;
}
.ia-ledger-row-value {
  text-align: right; flex-shrink: 0;
}
.ia-ledger-row-primary {
  font-size: .95rem; font-weight: 700; color: var(--ia-navy);
}
.ia-ledger-row-detail {
  font-size: .75rem; color: var(--ia-muted); margin-top: 1px;
}

.ia-ledger-total {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 14px 16px; border-top: 2px solid var(--ia-border); background: #f8fafc;
}
.ia-ledger-total-label {
  font-size: .92rem; font-weight: 700; color: var(--ia-dark);
}
.ia-ledger-total-value {
  font-size: 1.15rem; font-weight: 700; color: var(--ia-navy);
}
.ia-ledger-total-detail {
  font-size: .72rem; color: var(--ia-muted); margin-top: 1px; text-align: right;
}

/* Info tooltip icon */
.ia-info {
  display: inline-flex; align-items: center; justify-content: center;
  width: 16px; height: 16px; border-radius: 50%; background: var(--ia-border);
  color: var(--ia-muted); font-size: .65rem; font-weight: 700; font-style: normal;
  cursor: help; position: relative; flex-shrink: 0; line-height: 1;
}
.ia-info::after {
  content: attr(data-tip);
  position: absolute; top: calc(100% + 8px); left: 50%; transform: translateX(-50%);
  background: var(--ia-dark); color: #fff; font-size: .75rem; font-weight: 400;
  padding: 8px 12px; border-radius: 6px; white-space: normal; width: 240px;
  line-height: 1.4; pointer-events: none; opacity: 0; transition: opacity .15s;
  z-index: 30; text-align: left;
}
.ia-info:hover::after, .ia-info.active::after { opacity: 1; }

/* Year-by-year summary */
.ia-yearly { margin: 28px 0; }
.ia-yearly-title { font-size: 1.2rem; font-weight: 700; color: var(--ia-dark); margin-bottom: 12px; }

.ia-yr-row {
  display: flex; align-items: baseline; gap: 12px;
  padding: 10px 16px; border-bottom: 1px solid #f0f2f5;
  background: var(--ia-card); transition: background .1s;
}
.ia-yr-row:first-child { border-radius: var(--ia-radius) var(--ia-radius) 0 0; }
.ia-yr-row:last-child { border-bottom: none; border-radius: 0 0 var(--ia-radius) var(--ia-radius); }
.ia-yr-row:first-child:last-child { border-radius: var(--ia-radius); }
.ia-yr-row:hover { background: #fafbfc; }
.ia-yr-row.highlight { background: #fffbeb; }

.ia-yr-year {
  font-size: .92rem; font-weight: 700; color: var(--ia-dark);
  min-width: 44px; flex-shrink: 0;
}
.ia-yr-trims {
  display: flex; gap: 16px; flex: 1; min-width: 0;
}
.ia-yr-trim {
  display: flex; align-items: baseline; gap: 6px;
  font-size: .82rem; min-width: 0; flex: 1;
}
.ia-yr-trim-name {
  color: var(--ia-text-sec); white-space: nowrap; overflow: hidden;
  text-overflow: ellipsis; min-width: 0;
}
.ia-yr-cpmr {
  font-weight: 700; white-space: nowrap; flex-shrink: 0;
}
.ia-yr-cpmr.low { color: #27ae60; }
.ia-yr-cpmr.high { color: #c0392b; }
.ia-yr-sep {
  color: var(--ia-border); flex-shrink: 0; font-size: .75rem;
  display: none;
}

/* Year table header & controls */
.ia-yearly-controls {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 8px; margin-bottom: 12px;
}
.ia-yearly-sort {
  padding: 6px 10px; border: 2px solid var(--ia-navy); border-radius: 8px;
  font-size: .82rem; font-weight: 600; background: #fff; color: var(--ia-navy);
  cursor: pointer;
}
.ia-yearly-sort:focus { outline: none; border-color: var(--ia-gold); }

.ia-yr-header {
  display: flex; align-items: baseline; gap: 12px;
  padding: 8px 16px; font-size: .72rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .5px; color: var(--ia-muted);
}
.ia-yr-header-year { min-width: 44px; flex-shrink: 0; }
.ia-yr-header-trims {
  display: flex; gap: 16px; flex: 1; min-width: 0;
}
.ia-yr-header-trim { flex: 1; min-width: 0; }

/* Lifetime override bar */
.ia-lifetime-bar {
  border-top: 1px solid var(--ia-border); margin-top: 10px;
  padding: 10px 0 0; display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.ia-lifetime-label {
  font-size: .82rem; font-weight: 600; color: var(--ia-text); white-space: nowrap;
}
.ia-lifetime-field { display: flex; align-items: center; gap: 6px; }
.ia-lifetime-input {
  width: 110px; padding: 5px 10px; border: 2px solid var(--ia-border); border-radius: 6px;
  font-size: .85rem; font-weight: 600; text-align: right; font-family: var(--ia-font); color: var(--ia-text);
}
.ia-lifetime-input:focus { outline: none; border-color: var(--ia-navy); }
.ia-lifetime-input.error { border-color: #c0392b; }
.ia-lifetime-unit { font-size: .82rem; color: var(--ia-muted); }
.ia-lifetime-apply {
  padding: 5px 14px; border: 2px solid var(--ia-navy); border-radius: 6px;
  background: var(--ia-navy); color: #fff; font-size: .82rem; font-weight: 600; cursor: pointer; white-space: nowrap;
}
.ia-lifetime-apply:hover { background: var(--ia-mid); }
.ia-lifetime-reset {
  padding: 5px 12px; border: none; background: none; color: var(--ia-blue);
  font-size: .82rem; cursor: pointer; text-decoration: underline; display: none;
}
.ia-lifetime-reset:hover { color: var(--ia-navy); }
.ia-lifetime-error { font-size: .78rem; color: #c0392b; display: none; }
.ia-lifetime-error.visible { display: inline; }
.ia-lifetime-note { font-size: .78rem; color: var(--ia-muted); display: none; }
.ia-lifetime-note.visible { display: inline; }

/* Responsive */
@media (max-width: 768px) {
  .ia-nav-links { display: none; flex-direction: column; position: absolute; top: 72px; left: 0; right: 0; background: var(--ia-dark); padding: 16px 20px; gap: 16px; }
  .ia-nav-links.open { display: flex; }
  .ia-nav-toggle { display: block; }
  .ia-hero h1 { font-size: 1.6rem; }
  .ia-hero p { font-size: 1rem; }
  .ia-chart-wrap { height: 300px; }
  .ia-stats { grid-template-columns: 1fr 1fr; }
  .ia-compare-row { grid-template-columns: 1fr; }
  .ia-ledger-columns { grid-template-columns: 1fr; }
  .ia-ledger-controls { flex-direction: column; align-items: stretch; }
  .ia-ledger-year-select { width: 100%; }
  .ia-info::after { left: 0; right: auto; transform: none; width: 200px; }
  .ia-yr-row { flex-wrap: wrap; gap: 4px 12px; }
  .ia-yr-trims { flex-direction: column; gap: 2px; }
  .ia-yr-header { display: none; }
}

@media (max-width: 480px) {
  .ia-stats { grid-template-columns: 1fr; }
  .ia-chart-wrap { height: 260px; }
  .ia-ledger-row { padding: 10px 12px; }
  .ia-ledger-row-label { font-size: .82rem; }
  .ia-ledger-row-primary { font-size: .88rem; }
  .ia-info::after { width: 180px; }
}