:root {
  --bg-dark: #070b14;
  --bg-card: #0f172a;
  --bg-card-alt: #131d35;
  --border: rgba(255, 255, 255, 0.09);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --emerald: #10b981;
  --cyan: #38bdf8;
  --orange: #f97316;
  --red: #ef4444;
  --gold: #facc15;
  --purple: #a855f7;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at 50% 0%, #111c38 0%, var(--bg-dark) 65%);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  padding-bottom: 60px;
}

.container {
  max-width: 1340px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 11, 20, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
  font-size: 1.25rem;
  letter-spacing: 0.5px;
}

.brand-icon {
  background: linear-gradient(135deg, var(--emerald), var(--cyan));
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.badge-pro {
  font-size: 0.7rem;
  background: rgba(16, 185, 129, 0.18);
  color: var(--emerald);
  border: 1px solid rgba(16, 185, 129, 0.45);
  padding: 2px 8px;
  border-radius: 99px;
  vertical-align: middle;
  margin-left: 6px;
}

.nav-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.nav-tab {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 9px 16px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-tab:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.nav-tab.active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.22), rgba(56, 189, 248, 0.22));
  color: #fff;
  border-color: var(--emerald);
  box-shadow: 0 0 18px rgba(16, 185, 129, 0.2);
}

.btn-accent {
  background: linear-gradient(135deg, var(--emerald), #059669);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

/* Telemetry Strip */
.telemetry-strip {
  background: rgba(15, 23, 42, 0.75);
  border-bottom: 1px solid var(--border);
  padding: 14px 0 18px;
  margin-bottom: 26px;
}

/* Vehicle Category Switcher Bar */
.category-switcher-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
  background: rgba(7, 11, 20, 0.6);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: 14px;
}

.cat-label {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--cyan);
}

.cat-pill-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  flex: 1;
}

.cat-pill {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}

.cat-pill:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.25);
}

.cat-pill.active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.25), rgba(56, 189, 248, 0.25));
  color: #fff;
  border-color: var(--emerald);
  box-shadow: 0 0 16px rgba(16, 185, 129, 0.25);
}

.cat-icon {
  font-size: 1.15rem;
}

.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
}

.tele-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
}

.tele-label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.tele-val {
  font-size: 1.08rem;
  font-weight: 800;
}

.text-emerald { color: var(--emerald); }
.text-cyan { color: var(--cyan); }
.text-orange { color: var(--orange); }
.text-gold { color: var(--gold); }

/* Tabs & Grid */
.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.grid-2col {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 24px;
}

@media (max-width: 1024px) {
  .grid-2col {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 18px;
}

.eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--cyan);
  display: block;
}

.card-header h2 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-top: 2px;
}

/* A/B Toggle */
.ab-toggle {
  display: flex;
  background: #070b14;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 3px;
}

.ab-btn {
  background: transparent;
  color: var(--text-muted);
  border: none;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

.ab-btn.active {
  background: var(--orange);
  color: #fff;
}

/* Canvas Stage */
.canvas-wrap {
  position: relative;
  background: #050811;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 16px;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
}

.flame-indicator {
  position: absolute;
  top: 14px;
  right: 14px;
  background: rgba(239, 68, 68, 0.22);
  border: 1px solid var(--red);
  color: #fecaca;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 5px 12px;
  border-radius: 99px;
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.12s ease;
}

.flame-indicator.pop {
  opacity: 1;
  transform: scale(1.04);
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.6);
}

/* Pedal & Engine Start Bar */
.pedal-bar {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.btn-engine-start {
  background: linear-gradient(135deg, #ef4444, #b91c1c);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 13px 16px;
  border-radius: 12px;
  font-weight: 800;
  font-size: 0.92rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.35);
  transition: transform 0.15s ease;
}

.btn-engine-start.running {
  background: linear-gradient(135deg, var(--emerald), #047857);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35);
}

.power-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 8px #fff;
}

.btn-action {
  background: #1e293b;
  color: #fff;
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
  padding: 12px;
  transition: all 0.15s ease;
}

.btn-action:hover:not(:disabled) {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--cyan);
}

.btn-action:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Sliders */
.throttle-slider-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  padding: 14px 16px;
  border-radius: 12px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
}

.mono-badge {
  background: rgba(56, 189, 248, 0.14);
  color: var(--cyan);
  border: 1px solid rgba(56, 189, 248, 0.35);
  padding: 3px 10px;
  border-radius: 6px;
  font-family: Consolas, monospace;
  font-size: 0.82rem;
}

.throttle-slider {
  width: 100%;
  accent-color: var(--emerald);
  height: 8px;
  cursor: pointer;
}

/* Controls Group */
.control-group {
  margin-bottom: 18px;
}

.control-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: #e2e8f0;
  margin-bottom: 8px;
}

.input-select {
  width: 100%;
  background: #070b14;
  color: #fff;
  border: 1px solid var(--border);
  padding: 11px 14px;
  border-radius: 10px;
  font-size: 0.92rem;
}

.pill-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.pill-btn {
  background: #090e1a;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 0.83rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: all 0.15s ease;
}

.pill-btn:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}

.pill-btn.active {
  background: rgba(16, 185, 129, 0.15);
  color: #fff;
  border-color: var(--emerald);
}

.toggle-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #090e1a;
  border: 1px solid var(--border);
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.86rem;
}

.toggle-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--emerald);
}

.parts-cta-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.14), rgba(56, 189, 248, 0.12));
  border: 1px solid rgba(16, 185, 129, 0.4);
  border-radius: 14px;
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.parts-tag {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--emerald);
  letter-spacing: 0.8px;
}

.parts-cta-box h4 {
  font-size: 1rem;
  margin: 2px 0 4px;
}

.parts-sub {
  font-size: 0.83rem;
  color: var(--text-muted);
}

.btn-shop {
  background: var(--emerald);
  color: #04130d;
  text-decoration: none;
  font-weight: 800;
  font-size: 0.86rem;
  padding: 10px 16px;
  border-radius: 10px;
  white-space: nowrap;
}

/* Visual Car Stage */
.car-stage {
  background: #060a14;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 14px;
}

.visual-metrics-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 0.85rem;
}

.visual-metrics-bar span {
  color: var(--text-muted);
  display: block;
  font-size: 0.75rem;
}

.color-swatches {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.swatch {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.25);
  cursor: pointer;
  transition: transform 0.15s ease;
}

.swatch.active {
  transform: scale(1.16);
  border: 3px solid #fff;
  box-shadow: 0 0 14px rgba(255, 255, 255, 0.5);
}

.selected-swatch-label {
  font-size: 0.8rem;
  color: var(--cyan);
}

/* Fitment Form */
.fitment-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.fit-box {
  background: #090e1a;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.fit-box.highlight {
  border-color: rgba(16, 185, 129, 0.5);
}

.fit-box h4 {
  font-size: 0.92rem;
  margin-bottom: 10px;
  color: var(--cyan);
}

.fit-box label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.fit-box input {
  width: 78px;
  background: #0f172a;
  border: 1px solid var(--border);
  color: #fff;
  padding: 5px 8px;
  border-radius: 6px;
  text-align: right;
  font-weight: 700;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}

.modal-backdrop.hidden {
  display: none;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--emerald);
  border-radius: 18px;
  max-width: 620px;
  width: 100%;
  padding: 24px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.btn-close {
  background: transparent;
  color: #fff;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
}

.spec-summary-body {
  background: #070b14;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  font-size: 0.92rem;
}

/* Quote Table in Tab 5 */
.quote-table-wrap {
  background: #060a14;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow-x: auto;
}

.quote-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
  text-align: left;
}

.quote-table th {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.quote-table td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.quote-table tr:last-child td {
  border-bottom: none;
}

.quote-table td strong {
  color: #fff;
  display: block;
}

.quote-table td small {
  color: var(--text-muted);
  font-size: 0.76rem;
}

.topbar-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.btn-pro-unlock {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #070b14;
  border: none;
  padding: 10px 16px;
  border-radius: 10px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
}

.pricing-tiers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 18px;
}

@media (max-width: 720px) {
  .pricing-tiers-grid {
    grid-template-columns: 1fr;
  }
}

.tier-box {
  background: #080d1a;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
}

.tier-box.highlight {
  border: 2px solid var(--emerald);
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.08), #080d1a);
}

.tier-box h4 {
  font-size: 1.2rem;
  margin: 4px 0 6px;
}

.tier-price {
  font-size: 1.85rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 12px;
}

.tier-price small {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.tier-features {
  list-style: none;
  font-size: 0.84rem;
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ls-activation-bar {
  display: flex;
  gap: 12px;
  align-items: center;
  background: #070b14;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  flex-wrap: wrap;
}



/* ===== StanceMath polish: intro, SEO content, footer, mobile ===== */
.hero-intro { padding: 22px 0 6px; }
.hero-intro h1 { font-size: clamp(1.5rem, 3.2vw, 2.3rem); font-weight: 900; line-height: 1.15; margin: 0 0 8px; }
.hero-sub { color: var(--text-muted); max-width: 820px; font-size: 1rem; line-height: 1.55; margin: 0; }
.fine-print { font-size: 0.78rem; color: var(--text-muted); line-height: 1.5; margin-top: 10px; }
.seo-content { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; padding: 28px 0 10px; }
.seo-block { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 20px 22px; line-height: 1.6; }
.seo-block h2 { font-size: 1.2rem; margin: 0 0 10px; }
.seo-block h3 { font-size: 1rem; margin: 14px 0 4px; }
.seo-block p, .seo-block li { color: #cbd5e1; font-size: 0.95rem; }
.seo-block ul, .seo-block ol { padding-left: 20px; }
.seo-block a, .site-footer a { color: var(--cyan); }
.site-footer { border-top: 1px solid var(--border); margin-top: 28px; padding: 22px 0 34px; }
.footer-inner nav { display: flex; flex-wrap: wrap; gap: 10px 20px; margin-bottom: 10px; }
.tool-page { padding: 18px 0 10px; }
.tool-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.tool-grid label, .tool-form label { display: flex; flex-direction: column; gap: 4px; font-size: 0.85rem; color: var(--text-muted); }
.tool-grid input, .tool-grid select, .tool-form input, .tool-form select { background: #070b14; color: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 9px 10px; font-size: 1rem; }
.result-table { width: 100%; border-collapse: collapse; margin-top: 14px; font-size: 0.95rem; }
.result-table th, .result-table td { border-bottom: 1px solid var(--border); padding: 8px 6px; text-align: left; }
.result-table td.num { font-variant-numeric: tabular-nums; }
.breadcrumbs { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 6px; }
.breadcrumbs a { color: var(--cyan); }
[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; }

@media (max-width: 900px) {
  .seo-content, .tool-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .topbar-inner { flex-wrap: wrap; gap: 10px; }
  .nav-tabs { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; width: 100%; padding-bottom: 4px; }
  .nav-tab { white-space: nowrap; padding: 8px 12px; font-size: 0.85rem; }
  .topbar-actions { width: 100%; display: flex; gap: 8px; }
  .topbar-actions button { flex: 1; }
  .telemetry-grid { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
  .fitment-form-grid { grid-template-columns: 1fr !important; }
  .pill-grid { grid-template-columns: 1fr !important; }
  .card { padding: 16px; }
  input, select { font-size: 16px; } /* stops iOS zoom on focus */
}
a.nav-tab { text-decoration: none; display: inline-block; }
@media (max-width: 720px) { .telemetry-grid { display: none !important; } .hero-intro { padding-top: 14px; } }

/* ===== New standalone tools: index grid, related links, verdicts, affiliate ===== */
.tools-index { padding: 8px 0 22px; }
.tools-index h2 { margin: 0 0 14px; font-size: 1.3rem; }
.tools-index-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.tool-card { display: block; text-decoration: none; color: inherit; background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 16px 18px; transition: border-color 0.15s ease; }
.tool-card:hover { border-color: var(--cyan); }
.tool-card h3 { margin: 0 0 6px; font-size: 1rem; }
.tool-card p { margin: 0; color: var(--text-muted); font-size: 0.85rem; line-height: 1.45; }
.related-tools { margin-top: 22px; padding-top: 8px; }
.related-tools h2 { font-size: 1.05rem; margin: 0 0 10px; }
.related-tools ul { display: flex; flex-wrap: wrap; gap: 8px 16px; list-style: none; padding: 0; margin: 0; }
.related-tools a { color: var(--cyan); }
.warn-ok { color: var(--emerald); font-weight: 600; }
.warn-tight { color: var(--gold); font-weight: 600; }
.warn-bad { color: #f87171; font-weight: 600; }
.dataset-note { background: rgba(250, 204, 21, 0.08); border: 1px solid rgba(250, 204, 21, 0.35); border-radius: 10px; padding: 10px 12px; font-size: 0.85rem; color: #fde68a; margin-top: 12px; line-height: 1.5; }
.affiliate-links { display: flex; gap: 8px; flex-wrap: wrap; }
.affiliate-cta { margin-top: 16px; }
.tool-section-title { font-size: 1.05rem; margin: 22px 0 10px; }
#bpResults, #bpReverseBody { overflow-x: auto; }
code { font-size: 0.88em; background: rgba(255,255,255,0.06); padding: 1px 5px; border-radius: 4px; }
@media (max-width: 1100px) {
  .nav-tabs { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .nav-tab { white-space: nowrap; }
  .tools-index-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 520px) {
  .tools-index-grid { grid-template-columns: 1fr; }
}