/* Audi Rennsport hub — DB Automobile GmbH — standalone identity */
:root {
  --void: #070708;
  --carbon: #0f1012;
  --elevated: #16181c;
  --chrome: #b8bcc8;
  --chrome-dim: #6d7380;
  --text: #f4f5f7;
  --muted: #9aa0ad;
  --renn: #e20613;
  --renn-glow: rgba(226, 6, 19, 0.35);
  --font-display: "Sora", system-ui, sans-serif;
  --font-body: "Manrope", system-ui, sans-serif;
  --r: 4px;
  --r-lg: 14px;
  --header-h: 64px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --page-max: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body.hub-root {
  margin: 0;
  font-family: var(--font-body);
  background: var(--void);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: clip;
}

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

.skip-link {
  position: fixed;
  top: var(--safe-top);
  left: var(--safe-left);
  z-index: 10000;
  padding: 0.6rem 1rem;
  background: var(--renn);
  color: #fff;
  font-weight: 700;
  font-size: 0.8rem;
  clip-path: inset(0 0 100% 0);
  transition: clip-path 0.2s;
}

.skip-link:focus {
  clip-path: inset(0 0 0 0);
  outline: 2px solid var(--chrome);
}

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

/* Header */
.hub-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  min-height: var(--header-h);
  padding: var(--safe-top) max(1rem, var(--safe-left)) 0 max(1rem, var(--safe-right));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: linear-gradient(180deg, rgba(7, 7, 8, 0.97) 40%, transparent);
  border-bottom: 1px solid transparent;
  transition: background 0.25s, border-color 0.25s;
}

.hub-header-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-shrink: 0;
}

.hub-lang {
  display: flex;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--r);
  overflow: hidden;
}

.hub-lang-btn {
  font-family: var(--font-display);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  padding: 0.5rem 0.7rem;
  background: transparent;
  color: var(--muted);
  border: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.hub-lang-btn + .hub-lang-btn {
  border-left: 1px solid rgba(255, 255, 255, 0.1);
}

.hub-lang-btn:hover:not(.is-active) {
  color: var(--chrome);
}

.hub-lang-btn.is-active {
  background: rgba(226, 6, 19, 0.22);
  color: var(--text);
}

.hub-header.is-scrolled {
  background: rgba(7, 7, 8, 0.92);
  backdrop-filter: blur(12px);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.brand-mark {
  flex-shrink: 0;
  border-radius: var(--r);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
}

.brand-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text);
  white-space: nowrap;
}

.brand-sub {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--chrome-dim);
}

.hub-nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.hub-nav a:hover {
  color: var(--chrome);
}

@media (max-width: 640px) {
  .hub-nav {
    display: none;
  }
}

/* Hero */
.hub-hero {
  position: relative;
  min-height: 88vh;
  min-height: 88dvh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + var(--safe-top) + 2.5rem) 1.25rem 4rem;
  overflow: hidden;
}

.hub-hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* Base: depth gradient + top-right “pit lane” arc */
.hub-hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    conic-gradient(
      from 225deg at 92% -8%,
      rgba(226, 6, 19, 0.12) 0deg,
      rgba(226, 6, 19, 0.03) 55deg,
      transparent 120deg
    ),
    radial-gradient(ellipse 90% 55% at 100% 0%, rgba(22, 24, 30, 0.95) 0%, transparent 58%),
    radial-gradient(ellipse 70% 45% at 0% 100%, rgba(226, 6, 19, 0.06) 0%, transparent 52%),
    linear-gradient(165deg, #121318 0%, var(--void) 38%, #050506 100%);
}

/* Carbon mesh + soft vignette (replaces diagonal stripe motif) */
.hub-hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: center center;
  mask-image: radial-gradient(ellipse 85% 70% at 45% 42%, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse 85% 70% at 45% 42%, #000 0%, transparent 72%);
}

.hub-hero-bg-lights {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 120% 60% at 50% 110%, rgba(226, 6, 19, 0.09) 0%, transparent 45%);
  filter: blur(40px);
  pointer-events: none;
}

.hub-hero-bg-arc {
  position: absolute;
  top: -30%;
  right: -25%;
  width: min(90vw, 720px);
  height: min(90vw, 720px);
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.04);
  box-shadow:
    0 0 0 1px rgba(226, 6, 19, 0.06),
    inset 0 0 80px rgba(226, 6, 19, 0.04);
  pointer-events: none;
  opacity: 0.85;
}

.hub-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--page-max);
  margin: 0 auto;
  width: 100%;
}

.hub-kicker {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--renn);
  margin: 0 0 1rem;
}

.hub-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 6vw, 3.6rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
  max-width: 18ch;
}

.hub-hero-lead {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 36rem;
  margin: 0 0 2rem;
}

.hub-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn-solid {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.5rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--renn);
  color: #fff;
  border-radius: var(--r);
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-solid:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px var(--renn-glow);
}

.btn-line {
  display: inline-flex;
  align-items: center;
  padding: 0.85rem 1.35rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--chrome);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--r);
  transition: border-color 0.2s, color 0.2s;
}

.btn-line:hover {
  border-color: var(--renn);
  color: var(--text);
}

/* DB commercial */
.hub-commercial {
  padding: 4rem 1.25rem;
  background: var(--carbon);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.hub-commercial-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  display: grid;
  gap: 2rem;
}

@media (min-width: 900px) {
  .hub-commercial-inner {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
  }
}

.hub-commercial h2 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 700;
  margin: 0 0 1rem;
}

.hub-commercial-lead {
  font-size: 1.05rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

.hub-commercial ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.hub-commercial li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.65rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.hub-commercial li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  background: var(--renn);
  border-radius: 1px;
  transform: rotate(45deg);
}

.hub-commercial-cta-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.hub-badge {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--renn);
  border: 1px solid rgba(226, 6, 19, 0.4);
  border-radius: var(--r);
  margin-bottom: 1rem;
}

.hub-card-panel {
  background: var(--elevated);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--r-lg);
  padding: 1.75rem;
}

.hub-card-panel h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
  color: var(--chrome);
}

.hub-card-panel p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.65;
}

.hub-card-panel a {
  color: var(--renn);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.hub-card-panel a:hover {
  color: var(--chrome);
}

/* Guides */
.hub-guides {
  padding: 4rem 1.25rem 5rem;
}

.hub-guides-inner {
  max-width: var(--page-max);
  margin: 0 auto;
}

.hub-guides-head {
  margin-bottom: 2rem;
}

.hub-guides-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.hub-guides-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
  max-width: 40rem;
}

.guide-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 720px) {
  .guide-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1100px) {
  .guide-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.guide-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 1.75rem;
  background: var(--elevated);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--r-lg);
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}

.guide-card:hover {
  border-color: rgba(226, 6, 19, 0.45);
  transform: translateY(-4px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.guide-card-tag {
  font-family: var(--font-display);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--renn);
  margin-bottom: 0.75rem;
}

.guide-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 0.65rem;
}

.guide-card p {
  flex: 1;
  margin: 0 0 1.25rem;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.6;
}

.guide-card-cta {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--chrome);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.guide-card:hover .guide-card-cta {
  color: var(--renn);
}

.guide-card-cta::after {
  content: "→";
  transition: transform 0.2s;
}

.guide-card:hover .guide-card-cta::after {
  transform: translateX(4px);
}

/* Footer */
.hub-footer {
  padding: 2.5rem 1.25rem calc(2rem + var(--safe-bottom));
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  background: var(--void);
}

.hub-footer-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
}

@media (min-width: 640px) {
  .hub-footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
    align-items: flex-start;
  }
}

.hub-footer strong {
  font-family: var(--font-display);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
}

.hub-footer p {
  margin: 0.25rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.hub-footer a {
  color: var(--renn);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.hub-footer a:hover {
  color: var(--chrome);
}

.hub-legal-line {
  margin: 0.5rem 0 0;
  font-size: 0.72rem;
}

.hub-legal-line a {
  color: var(--renn);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.hub-legal-line a:hover {
  color: var(--chrome);
}

.hub-legal-sep {
  color: var(--chrome-dim);
}

.hub-footer-note {
  font-size: 0.72rem;
  color: var(--chrome-dim);
  max-width: 22rem;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .btn-solid:hover,
  .guide-card:hover {
    transform: none;
  }
}