/* ======================================================
   DRIVER LABS v2.0 — Design System
   Dark, premium, racing-oriented. No excessive gradients.
   ====================================================== */

/* ---------- CUSTOM PROPERTIES ---------- */
:root {
  /* Palette */
  --bg-primary: #050508;
  --bg-surface: #111118;
  --bg-elevated: #1a1a24;
  --accent-primary: #ff4d00;
  --accent-hover: #ff6a2f;
  --text-primary: #e8e8e8;
  --text-secondary: #888888;
  --text-muted: #555555;
  --border-color: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(255, 77, 0, 0.3);

  /* Typography */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --nav-height: 64px;
  --container-max: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* ---------- RESET & BASE ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- NAV BAR (fixed top, 64px) ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(5, 5, 8, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}

.nav__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.nav__logo-icon {
  color: var(--accent-primary);
  font-size: 1.4rem;
}

.nav__links {
  display: flex;
  gap: 32px;
}

.nav__link {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: color 0.2s ease;
}

.nav__link:hover,
.nav__link--active {
  color: var(--accent-primary);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Hamburger button (hidden on desktop) */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav__hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text-primary);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav__hamburger.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.is-active span:nth-child(2) { opacity: 0; }
.nav__hamburger.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.15s ease;
}

.btn--accent {
  background-color: var(--accent-primary);
  color: #fff;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
}

.btn--accent:hover {
  background-color: var(--accent-hover);
}

.btn--sm {
  font-size: 0.8rem;
  padding: 6px 16px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

/* ---------- HERO SECTION (full viewport) ---------- */
.hero {
  margin-top: var(--nav-height);
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--bg-primary) 0%, transparent 60%);
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  padding: 48px 24px;
}

.hero__tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-primary);
  background: rgba(255, 77, 0, 0.1);
  border: 1px solid var(--border-accent);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: 28px;
}

.hero__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- ARTICLE CARDS GRID (responsive) ---------- */
.section-header {
  text-align: center;
  padding: 64px 24px 32px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 0 24px 64px;
  max-width: var(--container-max);
  margin: 0 auto;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
  border-color: var(--border-accent);
}

.card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background-color: var(--bg-elevated);
}

.card__body {
  padding: 20px;
}

.card__tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  margin-bottom: 8px;
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 8px;
}

.card__excerpt {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__meta {
  padding: 12px 20px;
  border-top: 1px solid var(--border-color);
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

/* ---------- COMPARISON CARD LAYOUT (two products + VS) ---------- */
.comparison-card {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.comparison-side {
  padding: 24px;
}

.comparison-side__img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  background-color: var(--bg-elevated);
}

.comparison-side__name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.comparison-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 64px;
  padding: 24px 12px;
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
}

.comparison-vs__badge {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 800;
  color: var(--bg-primary);
  background: var(--accent-primary);
  padding: 6px 14px;
  border-radius: 20px;
  letter-spacing: 0.05em;
}

/* ---------- MARQUEE STRIP ---------- */
.marquee-strip {
  overflow: hidden;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee-scroll 30s linear infinite;
}

.marquee-list {
  display: flex;
  gap: 48px;
  padding-right: 48px;
}

.marquee-list li span {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

@keyframes marquee-scroll {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ---------- STATS BAR ---------- */
.stats-bar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 32px 24px;
}

.stats-bar__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item__number {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  color: var(--accent-primary);
  letter-spacing: -0.02em;
}

.stat-item__label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ---------- FADE-IN ANIMATION (for IntersectionObserver) ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- FOOTER (multi-column) ---------- */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 48px 24px 24px;
}

.footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 32px;
}

.footer__heading {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.footer__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 340px;
  margin-bottom: 20px;
}

.footer__subheading {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer__links li {
  margin-bottom: 10px;
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.footer__links a:hover {
  color: var(--accent-primary);
}

/* Social icons */
.footer__socials {
  display: flex;
  gap: 12px;
}

.footer__socials a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.6875rem;
  color: var(--text-secondary);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.footer__socials a:hover {
  background: var(--accent-primary);
  color: #fff;
  border-color: transparent;
}

/* Newsletter */
.footer__news-desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.newsletter-form {
  display: flex;
  gap: 8px;
}

.newsletter-form input[type="email"] {
  flex: 1;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.8125rem;
}

.newsletter-form input[type="email"]::placeholder {
  color: var(--text-muted);
}

/* Footer bottom */
.footer__bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.footer__legal a {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.footer__legal a:hover {
  color: var(--accent-primary);
}

/* ---------- RESPONSIVE — TABLET (≤1024px) ---------- */
@media (max-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-bar__inner {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer__col--wide {
    grid-column: 1 / -1;
  }
}

/* ---------- RESPONSIVE — MOBILE (<768px) ---------- */
@media (max-width: 767px) {

  /* Nav → hamburger */
  .nav__hamburger { display: flex; }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0; bottom: 0;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    background: rgba(5, 5, 8, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
  }

  .nav__links.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
  }

  .nav__link { font-size: 1rem; letter-spacing: 0.1em; }

  /* Cards → single column */
  .cards-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* Comparison → stacked */
  .comparison-card {
    grid-template-columns: 1fr;
  }

  .comparison-vs {
    min-width: auto;
    padding: 16px;
    border-left: none;
    border-right: none;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
  }

  /* Stats → 2 columns */
  .stats-bar__inner {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  /* Footer → single column */
  .footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: center;
    gap: 8px;
  }
}

/* ---------- UTILITY / MISC ---------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}