/* Doctor CJC-1295 — BMW Angular Precision
 * Zero border-radius universally. Inter 300 UPPERCASE display vs Inter 900 nav.
 * BMW Blue (#1C69D4) reserved STRICTLY for interactive elements.
 * Alternating charcoal/white zones.
 * JetBrains Mono for technical identifiers.
 */

:root {
  --white:       #FFFFFF;
  --charcoal:    #262626;
  --black:       #000000;
  --gray-50:     #F7F7F7;
  --gray-100:    #EFEFEF;
  --gray-200:    #E5E5E5;
  --gray-300:    #BBBBBB;
  --gray-500:    #757575;
  --gray-700:    #3F3F3F;
  --blue:        #1C69D4;
  --blue-hover:  #0653B6;
  --blue-50:     #E8F0FB;

  --font-sans:   'Inter', 'Helvetica Neue', 'Helvetica', 'Arial', system-ui, sans-serif;
  --font-mono:   'JetBrains Mono', 'IBM Plex Mono', 'SF Mono', Consolas, monospace;

  --container-px: clamp(1.25rem, 4vw, 3rem);
  --max-width:    78rem;

  --rule:         1px solid var(--gray-200);
  --rule-dark:    1px solid var(--gray-700);
  --rule-strong:  1px solid var(--charcoal);
  --rule-feat:    2px solid var(--charcoal);
  --rule-blue:    2px solid var(--blue);
}

/* Reset */
*,*::before,*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; }
img, svg { max-width: 100%; height: auto; display: block; }
button { font: inherit; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-hover); }
:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
  box-shadow: 0 0 0 2px var(--white);
}
hr { border: 0; border-top: var(--rule); margin: 2rem 0; }

/* Base typography */
html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--charcoal);
  background: var(--white);
}
body {
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.55;
  color: var(--charcoal);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
p { margin: 0 0 1.5rem; max-width: 70ch; }
p:last-child { margin-bottom: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  margin: 0 0 1rem;
  color: inherit;
}
h1 {
  font-weight: 300;
  font-size: clamp(2.25rem, 6vw, 5rem);
  line-height: 1.0;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
h2 {
  font-weight: 400;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.15;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
h3 {
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.25;
  letter-spacing: 0;
}
h4 {
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.3;
}

strong, b { font-weight: 700; }
em, i { font-style: italic; }

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--container-px);
  padding-right: var(--container-px);
}

/* Inline mono */
.mono, code, kbd, samp {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.9375rem;
}
code {
  border-bottom: 1px solid var(--blue);
  padding-bottom: 1px;
}

/* Eyebrows */
.eyebrow, .eyebrow-mono {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  line-height: 1.3;
  margin: 0 0 1rem;
  display: block;
}

.section-number {
  color: var(--blue);
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-right: 0.5rem;
}

/* Site header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--white);
  border-bottom: var(--rule-strong);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  gap: 1.5rem;
}
.site-brand {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.0625rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--charcoal);
  white-space: nowrap;
}
.site-brand:hover { color: var(--charcoal); }
.site-brand .divider {
  color: var(--gray-500);
  margin: 0 0.4em;
  font-weight: 900;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 2rem;
  align-items: center;
}
.site-nav a {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--charcoal);
  padding: 0.25rem 0;
  position: relative;
  display: inline-block;
}
.site-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  right: auto;
  bottom: -4px;
  height: 2px;
  width: 0;
  background: var(--blue);
  transition: width 150ms ease-out;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--charcoal);
}
.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  width: 100%;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1.5px solid var(--charcoal);
  color: var(--charcoal);
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.5rem 0.875rem;
  cursor: pointer;
}
.nav-toggle:hover { color: var(--blue); }

.mobile-nav {
  display: none;
  position: fixed;
  top: 0; right: 0; bottom: 0; left: 0;
  background: var(--charcoal);
  z-index: 100;
  padding: 5rem var(--container-px) 2rem;
  overflow-y: auto;
}
.mobile-nav.is-open { display: block; }
.mobile-nav ul { list-style: none; padding: 0; margin: 0; }
.mobile-nav a {
  display: block;
  padding: 1rem 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--white);
  border-bottom: var(--rule-dark);
}
.mobile-nav a:hover { color: var(--blue); }
.mobile-nav .close {
  position: absolute;
  top: 1.5rem;
  right: var(--container-px);
  background: transparent;
  color: var(--white);
  border: 1.5px solid var(--white);
  padding: 0.5rem 0.875rem;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
}

/* Hero — dark band */
.hero {
  background: var(--charcoal);
  color: var(--white);
  border-bottom: 1px solid var(--black);
  padding: clamp(3rem, 8vh, 6rem) 0 clamp(3rem, 8vh, 5rem);
}
.hero .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}
.hero-text { max-width: 60ch; }
.hero-text .eyebrow { color: var(--blue); margin-bottom: 1.25rem; }
.hero-text h1 { color: var(--white); margin-bottom: 1.5rem; }
.hero-text .subheadline {
  font-size: 1.1875rem;
  line-height: 1.5;
  color: var(--gray-300);
  font-weight: 400;
  margin-bottom: 2rem;
  max-width: 60ch;
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.hero--inner { padding: clamp(2.5rem, 6vh, 4.5rem) 0; }
.hero--inner h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
.hero--inner .subheadline { font-size: 1.0625rem; color: var(--gray-300); }

/* Hero stat grid */
.hero-data {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--gray-700);
  border-left: 1px solid var(--gray-700);
}
.hero-data .cell {
  border-right: 1px solid var(--gray-700);
  border-bottom: 1px solid var(--gray-700);
  padding: 1.25rem 1.25rem 1rem;
}
.hero-data .label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.5rem;
  display: block;
}
.hero-data .value {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.0;
  color: var(--white);
  letter-spacing: 0.01em;
}
.hero-figure {
  border: 1px solid var(--gray-300);
  margin: 0;
  background: var(--charcoal);
}
.hero-data--inset { margin-top: 1.5rem; }
.hero-figure img { width: 100%; display: block; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.9375rem 1.75rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 0;
  cursor: pointer;
  text-align: center;
  transition: background-color 180ms ease-out, color 180ms ease-out, border-color 180ms ease-out;
  border-radius: 0;
  position: relative;
}
.btn-primary {
  background: var(--blue);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--blue-hover);
  color: var(--white);
}
.btn-secondary {
  background: transparent;
  color: currentColor;
  border: 1.5px solid currentColor;
}
.btn-secondary:hover {
  color: var(--blue);
}
.btn-secondary:hover::after {
  content: '';
  position: absolute;
  left: -4px;
  bottom: -8px;
  width: 12px;
  height: 4px;
  background: var(--blue);
}
.hero .btn-secondary { color: var(--white); }
.hero .btn-secondary:hover { color: var(--blue); }

/* Section openers / bands */
section {
  padding: clamp(2.5rem, 6vh, 4.5rem) 0;
}
section.band-dark {
  background: var(--charcoal);
  color: var(--white);
  border-top: 1px solid var(--black);
  border-bottom: 1px solid var(--black);
}
section.band-dark h2, section.band-dark h3 { color: var(--white); }
section.band-dark p { color: var(--white); }
section.band-light {
  background: var(--white);
  color: var(--charcoal);
}
section.band-alt {
  background: var(--gray-50);
  color: var(--charcoal);
}

/* Section header pattern */
.section-head {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: var(--rule);
}
.band-dark .section-head { border-bottom: var(--rule-dark); }

/* Article / reading column */
.prose {
  max-width: 70ch;
}
.prose p {
  margin: 0 0 1.5rem;
  font-size: 1.0625rem;
  line-height: 1.55;
}
.prose ul, .prose ol {
  margin: 0 0 1.5rem;
  padding-left: 1.5rem;
}
.prose li { margin-bottom: 0.5rem; }
.prose h3 { margin-top: 2rem; }

/* Inline citation chips */
sup.cite {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.6875rem;
  line-height: 1;
  letter-spacing: 0.04em;
  vertical-align: super;
}
sup.cite a {
  color: var(--blue);
  border-bottom: 1px solid var(--blue);
  padding: 0 1px 1px;
  text-decoration: none;
}
sup.cite a:hover { color: var(--blue-hover); border-bottom-color: var(--blue-hover); }

/* Cards / grids */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr 1fr; }

.card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  padding: 1.75rem 2rem;
  position: relative;
  border-radius: 0;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--charcoal);
}
.band-dark .card {
  background: var(--charcoal);
  border-color: var(--gray-700);
  color: var(--white);
}
.band-dark .card::before { background: var(--blue); }
.card .eyebrow { margin-bottom: 0.75rem; }
.card h3 { margin: 0 0 0.75rem; }
.card p { margin: 0; }

.card--stat {
  border: 0;
  border-top: 1px solid var(--gray-300);
  padding: 1rem 1.25rem;
  background: transparent;
}
.card--stat::before { display: none; }
.card--stat .label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin: 0 0 0.5rem;
  display: block;
}
.card--stat .value {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: 2.25rem;
  line-height: 1.0;
  color: var(--charcoal);
  letter-spacing: 0.01em;
}
.card--stat .unit {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-top: 0.5rem;
  display: block;
}

.card--regulatory::before { background: var(--blue); }

/* Callout */
.callout {
  position: relative;
  background: var(--gray-50);
  border-top: var(--rule-strong);
  border-right: var(--rule-strong);
  border-bottom: var(--rule-strong);
  border-left: 4px solid var(--blue);
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
}
.callout .eyebrow { margin-bottom: 0.5rem; }
.callout h3 { margin-bottom: 0.75rem; font-size: 1.125rem; }
.callout p:last-child { margin-bottom: 0; }
.band-dark .callout {
  background: var(--gray-700);
  border-top-color: var(--gray-300);
  border-right-color: var(--gray-300);
  border-bottom-color: var(--gray-300);
  color: var(--white);
}

/* Figures */
.fig {
  margin: 2.5rem 0;
}
.fig-label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.75rem;
  display: block;
}
.fig img {
  border: 1px solid var(--charcoal);
  background: var(--white);
  width: 100%;
  display: block;
}
.band-dark .fig img { border-color: var(--gray-300); }
.fig figcaption {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--gray-500);
  margin-top: 0.75rem;
}
.band-dark .fig figcaption { color: var(--gray-300); }

/* Tables */
.table-wrap { overflow-x: auto; margin: 2rem 0; }
table.precision {
  width: 100%;
  border-collapse: collapse;
  border-top: 2px solid var(--charcoal);
  border-bottom: 1px solid var(--charcoal);
  font-size: 0.9375rem;
}
table.precision thead th {
  background: var(--gray-50);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--charcoal);
  color: var(--charcoal);
}
table.precision tbody td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--gray-200);
  vertical-align: top;
  color: var(--charcoal);
}
table.precision tbody tr {
  position: relative;
  transition: background-color 120ms ease-out, border-left-color 120ms ease-out;
  border-left: 1px solid transparent;
}
table.precision tbody tr:hover {
  background: var(--gray-50);
  border-left: 1px solid var(--blue);
}
table.precision td.mono,
table.precision td .mono {
  font-family: var(--font-mono);
}
table.precision td.num { text-align: right; font-variant-numeric: tabular-nums; }

/* DataTables overrides */
.dataTables_wrapper {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
}
.dataTables_wrapper .dataTables_filter input,
.dataTables_wrapper .dataTables_length select {
  font-family: var(--font-mono);
  border: 1px solid var(--charcoal);
  border-radius: 0;
  padding: 0.4rem 0.6rem;
  font-size: 0.875rem;
  background: var(--white);
  color: var(--charcoal);
}
.dataTables_wrapper .dataTables_filter input:focus,
.dataTables_wrapper .dataTables_length select:focus {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}
.dataTables_wrapper .dataTables_filter label,
.dataTables_wrapper .dataTables_length label {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--charcoal);
  margin-bottom: 1rem;
  display: inline-block;
}
.dataTables_wrapper .dataTables_info,
.dataTables_wrapper .dataTables_paginate {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--charcoal);
  padding-top: 1rem;
}
.dataTables_wrapper .dataTables_paginate .paginate_button {
  border: 1px solid var(--charcoal) !important;
  border-radius: 0 !important;
  background: var(--white) !important;
  color: var(--charcoal) !important;
  margin: 0 2px;
  padding: 0.35rem 0.7rem !important;
}
.dataTables_wrapper .dataTables_paginate .paginate_button:hover,
.dataTables_wrapper .dataTables_paginate .paginate_button.current,
.dataTables_wrapper .dataTables_paginate .paginate_button.current:hover {
  background: var(--blue) !important;
  color: var(--white) !important;
  border-color: var(--blue) !important;
}

/* Chips */
.chip {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.25rem 0.625rem;
  border-radius: 0;
  vertical-align: middle;
}
.chip--neutral {
  background: var(--gray-50);
  color: var(--charcoal);
  border: 1px solid var(--charcoal);
}
.chip--interactive {
  background: var(--blue);
  color: var(--white);
  border: 0;
}
.chip--status {
  background: transparent;
  color: var(--blue);
  border: 1px solid var(--blue);
}

/* Interactive marker */
.marker {
  display: inline-block;
  width: 4px;
  height: 12px;
  background: var(--blue);
  vertical-align: middle;
}
.marker--16 { height: 16px; }
.marker--24 { height: 24px; }

/* References list */
ol.references-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--charcoal);
}
ol.references-list li {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--gray-200);
  font-size: 0.9375rem;
  line-height: 1.5;
}
ol.references-list .num {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--blue);
  letter-spacing: 0.06em;
}
ol.references-list .doi {
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--blue);
  border-bottom: 1px solid var(--blue);
  font-size: 0.8125rem;
}
ol.references-list .meta-line {
  margin-top: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.75rem;
}

/* Form (contact) */
form.contact {
  display: grid;
  gap: 1.25rem;
  max-width: 36rem;
  margin: 2rem 0;
}
form.contact label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.4rem;
  display: block;
}
form.contact input,
form.contact textarea,
form.contact select {
  width: 100%;
  font: inherit;
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.75rem 0.875rem;
  background: var(--white);
  color: var(--charcoal);
  border: 1.5px solid var(--charcoal);
  border-radius: 0;
}
form.contact textarea { min-height: 9rem; resize: vertical; }
form.contact input:focus,
form.contact textarea:focus,
form.contact select:focus {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* Footer */
.site-footer {
  font-family: var(--font-sans);
}
.site-footer .upper {
  background: var(--black);
  color: var(--white);
  padding: 3rem 0 3rem;
  position: relative;
}
.site-footer .upper .marker-mark {
  position: absolute;
  bottom: 0;
  left: var(--container-px);
  width: 12px;
  height: 4px;
  background: var(--blue);
}
.site-footer .cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem 2rem;
}
.site-footer .col h4 {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin: 0 0 1rem;
}
.site-footer .col ul { list-style: none; margin: 0; padding: 0; }
.site-footer .col li { margin-bottom: 0.75rem; }
.site-footer .col a {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--white);
}
.site-footer .col a:hover { color: var(--blue); }

.site-footer .lower {
  background: var(--charcoal);
  color: var(--gray-300);
  padding: 1.5rem 0;
  border-top: var(--rule-dark);
}
.site-footer .lower .container {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
}
.site-footer .disclaimer {
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--gray-300);
  max-width: 60ch;
  margin: 0;
}
.site-footer .colophon {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin: 0;
}
.site-footer .copyright {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gray-300);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0;
  width: 100%;
  padding-top: 0.75rem;
}

/* Overview / 404 */
.center { text-align: center; }
.error-page {
  min-height: 60vh;
  display: flex;
  align-items: center;
  background: var(--charcoal);
  color: var(--white);
  padding: 4rem 0;
}
.error-page h1 { font-size: clamp(3rem, 10vw, 7rem); margin-bottom: 1rem; }
.error-page p { color: var(--gray-300); max-width: 40ch; margin: 0 auto 2rem; }
.error-page .container { text-align: center; }

/* Stack diagram (Q08) */
.stack-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 1.5rem 0;
}
.stack-line .chip { margin: 0; }
.stack-line .connector {
  flex: 0 0 1.5rem;
  height: 1px;
  background: var(--charcoal);
}

/* Tippy theme */
.tippy-box[data-theme~='bmw'] {
  background: var(--charcoal);
  color: var(--white);
  border-left: 2px solid var(--blue);
  border-radius: 0;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  line-height: 1.4;
  padding: 0.75rem 0.875rem;
  max-width: 360px;
}
.tippy-box[data-theme~='bmw'] .doi {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--blue);
  border-bottom: 1px solid var(--blue);
  margin-top: 0.5rem;
  display: inline-block;
}
.tippy-box[data-theme~='bmw'] .tippy-arrow { color: var(--charcoal); }

/* Responsive */
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .hero-data { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 900px) {
  .hero .container {
    grid-template-columns: 7fr 5fr;
    gap: 3rem;
    align-items: start;
  }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .site-nav { display: none; }
  .nav-toggle { display: inline-block; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}