/* ==========================================================================
   RennSport — Base: reset, document, typography, layout primitives
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1.5rem);
}

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--c-carbon);
  color: var(--c-titanium-lift);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* A faint carbon-weave tint so large dark areas never read as flat #000 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(120% 80% at 80% -10%, rgba(116, 1, 5, 0.18), transparent 62%),
    radial-gradient(90% 60% at 0% 100%, rgba(34, 3, 4, 0.9), transparent 70%),
    var(--c-carbon);
}

h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 400; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
figure { margin: 0; }

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

a {
  color: inherit;
  text-decoration: none;
}

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

button { background: none; border: 0; cursor: pointer; }

::selection {
  background: var(--c-red);
  color: var(--c-white);
}

/* --- Focus ---------------------------------------------------------------
   Always visible, never red-only (red alone must not carry meaning).        */
:focus-visible {
  outline: 2px solid var(--c-white);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: var(--s-4);
  top: var(--s-4);
  z-index: var(--z-skip);
  transform: translateY(-160%);
  background: var(--c-white);
  color: var(--c-carbon);
  padding: var(--s-3) var(--s-5);
  font-family: var(--font-display);
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--tracking-label);
  border-radius: var(--r-sm);
  transition: transform var(--t-base) var(--e-out);
}
.skip-link:focus-visible { transform: translateY(0); }

/* ==========================================================================
   Type roles
   ========================================================================== */

.display,
.h1, .h2, .h3, .h4 {
  color: var(--c-white);
  letter-spacing: var(--tracking-display);
  text-transform: uppercase;
  text-wrap: balance;
}

/* Headline sizes ride on Oxanium; small technical headings stay on Michroma */
.display, .h1, .h2, .h3 {
  font-family: var(--font-headline);
  font-weight: 600;
  letter-spacing: 0.01em;
}
.h4 { font-family: var(--font-display); }

.display { font-size: var(--fs-display); line-height: var(--lh-tight); }
.h1 { font-size: var(--fs-h1); line-height: var(--lh-tight); }
.h2 { font-size: var(--fs-h2); line-height: 1.06; }
.h3 { font-size: var(--fs-h3); line-height: var(--lh-snug); }
.h4 { font-size: var(--fs-h4); line-height: var(--lh-snug); letter-spacing: var(--tracking-label); }

/* Michroma has no short words to fall back on: a 15-character label like
   "STRAIGHTFORWARD" has a min-content width wider than a 320px card, so the
   display-font labels are allowed to break rather than push the layout out. */
.h4,
.eyebrow,
.mono-label,
.feature-card__title,
.step__title,
.vehicle-card__name,
.data-row__term,
.spec__key,
.field__label,
.footer-col__title { overflow-wrap: anywhere; }
/* `anywhere` rather than `break-word`: only the former also shrinks the
   element's min-content width, which is what a grid column sizes itself to. */

.eyebrow {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  font-family: var(--font-display);
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--c-titanium);
  line-height: 1.4;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  flex: none;
  /* Pinned to the middle of the first line rather than centred on the whole
     block: on a narrow screen a wrapped eyebrow left the rule floating in the
     gap between its two lines. Same position as before when it fits on one. */
  align-self: start;
  margin-top: 0.7em;
  background: linear-gradient(90deg, var(--c-red), rgba(176, 3, 8, 0));
}
.eyebrow--plain::before { display: none; }

.lede {
  font-size: var(--fs-body-lg);
  color: var(--c-titanium-lift);
  max-width: var(--measure);
}

.muted { color: var(--c-titanium); }
.small { font-size: var(--fs-body-sm); }

.mono-label {
  font-family: var(--font-display);
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--c-titanium);
}

.text-red { color: var(--c-red-text); }

/* Inline link inside body copy: underline grows from the left on hover */
.link {
  color: var(--c-white);
  background-image: linear-gradient(var(--c-red), var(--c-red));
  background-size: 0% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line-strong);
  transition: background-size var(--t-base) var(--e-out), color var(--t-fast) linear;
}
.link:hover { background-size: 100% 1px; color: var(--c-white); }

/* ==========================================================================
   Layout primitives
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* A narrow reading measure, still on the site's left rail. Centring the
   container instead put the page hero's headline and the body copy beneath it
   on two different left edges — a ~210px step at desktop widths. */
.container--narrow > * { max-width: var(--container-narrow); }

.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: clamp(3rem, 2rem + 4vw, 5rem); }
.section--graphite { background: var(--c-graphite); }
.section--oxblood {
  background: linear-gradient(170deg, var(--c-oxblood) 0%, var(--c-carbon) 78%);
}

/* Hairline that fades out at both ends — used between major sections */
.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, transparent, var(--line-hairline) 18%, var(--line-hairline) 82%, transparent);
}
.rule--red {
  background: linear-gradient(90deg, transparent, rgba(176, 3, 8, 0) 10%, var(--line-red) 50%, rgba(176, 3, 8, 0) 90%, transparent);
}

.section-head {
  display: grid;
  gap: var(--s-4);
  margin-bottom: clamp(2.5rem, 1.6rem + 3vw, 4.5rem);
}
@media (min-width: 900px) {
  .section-head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: end;
    gap: var(--s-8);
  }
  .section-head--split .section-head__aside { padding-bottom: var(--s-2); }
}

/* minmax(0, 1fr) rather than the default auto column: a single-column stack
   must never be widened past its container by one item's min-content size. */
.stack { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s-4); }
.stack-lg { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s-6); }
/* Keeps buttons at their natural width instead of stretching to the column */
.stack--start { justify-items: start; }

.grid { display: grid; gap: var(--s-5); }
@media (min-width: 680px) { .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 900px) { .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (min-width: 900px) { .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
@media (min-width: 680px) and (max-width: 899px) { .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   Scroll reveal — opt-in, and completely inert under reduced motion
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--t-cine) var(--e-out),
    transform var(--t-cine) var(--e-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
.reveal.is-in { opacity: 1; transform: none; }
html.no-js .reveal { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}