:root {
  --ink: #101827;
  --muted: #64748b;
  --blue: #2563eb;
  --line: #dbe5f3;
  --wash: #f8fbff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
}

.brand span {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--blue);
  color: #fff;
}

nav {
  display: flex;
  gap: 20px;
  color: var(--muted);
  font-weight: 800;
}

.header-cta,
.primary-btn,
.secondary-btn,
.lead-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 8px;
  font-weight: 900;
}

.header-cta,
.primary-btn,
.lead-form button {
  border: 0;
  background: var(--blue);
  color: #fff;
}

.secondary-btn {
  border: 1px solid var(--line);
  background: #fff;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, .8fr);
  gap: 42px;
  align-items: center;
  min-height: 720px;
  padding: 70px clamp(18px, 5vw, 80px);
  background:
    radial-gradient(circle at 80% 20%, rgba(37,99,235,.18), transparent 32%),
    linear-gradient(180deg, #f8fbff 0%, #fff 72%);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 950;
  letter-spacing: .1em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 880px;
  margin-bottom: 18px;
  font-size: clamp(44px, 7vw, 92px);
  line-height: .94;
  letter-spacing: -0.03em;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(34px, 4vw, 58px);
  line-height: 1;
}

.hero-text {
  max-width: 620px;
  color: var(--muted);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 30px;
  max-width: 680px;
}

.hero-stats span,
.card-grid article,
.review-card,
.faq-list details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.hero-stats span {
  padding: 14px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.hero-stats b {
  display: block;
  color: var(--ink);
  font-size: 20px;
}

.hero-visual {
  position: relative;
  min-height: 420px;
}

.headlight-card {
  position: absolute;
  inset: 0 auto auto 0;
  width: 82%;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 28px 70px rgba(15,23,42,.14);
}

.after-card {
  top: 120px;
  left: 80px;
}

.headlight-card span {
  display: block;
  margin-bottom: 12px;
  color: var(--muted);
  font-weight: 950;
  text-transform: uppercase;
}

.lens {
  height: 230px;
  border-radius: 8px;
}

.lens.before {
  background:
    radial-gradient(circle at 50% 50%, rgba(255,255,255,.45), transparent 28%),
    linear-gradient(135deg, #6b5f3f, #c2aa58 45%, #393229);
}

.lens.after {
  background:
    radial-gradient(circle at 50% 50%, rgba(255,255,255,.88), transparent 26%),
    linear-gradient(135deg, #dbeafe, #0f172a 48%, #3b82f6);
}

.section {
  padding: 80px clamp(18px, 5vw, 80px);
}

.section-head {
  max-width: 760px;
  margin-bottom: 28px;
}

.ba-slider {
  position: relative;
  height: min(62vw, 620px);
  min-height: 340px;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #111827;
}

.ba-image {
  position: absolute;
  inset: 0;
}

.ba-before {
  background:
    radial-gradient(circle at 48% 46%, rgba(255,255,255,.26), transparent 24%),
    linear-gradient(135deg, #312a1f, #b69a44 45%, #171717);
}

.ba-after {
  width: 50%;
  background:
    radial-gradient(circle at 48% 46%, rgba(255,255,255,.76), transparent 22%),
    linear-gradient(135deg, #bfdbfe, #111827 50%, #2563eb);
}

.ba-slider input {
  position: absolute;
  inset: 0;
  width: 100%;
  opacity: 0;
  cursor: ew-resize;
}

.ba-slider::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--split, 50%);
  width: 4px;
  background: #fff;
  transform: translateX(-50%);
  pointer-events: none;
}

.ba-label {
  position: absolute;
  top: 18px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.9);
  font-weight: 950;
}

.before-label {
  left: 18px;
}

.after-label {
  right: 18px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.card-grid article,
.review-card,
.faq-list details {
  padding: 22px;
}

.card-grid h3 {
  margin-bottom: 8px;
  font-size: 22px;
}

.card-grid p,
.review-card p,
.faq-list p,
.contact-section p {
  color: var(--muted);
  font-weight: 700;
  line-height: 1.5;
}

.reviews {
  background: var(--wash);
}

.review-track {
  display: grid;
}

.review-card {
  display: none;
  max-width: 760px;
}

.review-card.active {
  display: block;
}

.review-card p {
  font-size: 24px;
}

.faq-list {
  display: grid;
  gap: 10px;
  max-width: 860px;
}

summary {
  cursor: pointer;
  font-size: 18px;
  font-weight: 950;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, .8fr) minmax(320px, .7fr);
  gap: 32px;
  align-items: start;
  margin: 40px clamp(18px, 5vw, 80px) 80px;
  padding: 36px;
  border-radius: 8px;
  background: #0f172a;
  color: #fff;
}

.contact-section p {
  color: #cbd5e1;
}

.lead-form {
  display: grid;
  gap: 10px;
}

.lead-form input,
.lead-form textarea {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 8px;
  background: rgba(255,255,255,.08);
  color: #fff;
  font: inherit;
  font-weight: 700;
}

.lead-form input::placeholder,
.lead-form textarea::placeholder {
  color: #94a3b8;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 26px clamp(18px, 5vw, 80px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-weight: 800;
}

footer strong {
  color: var(--ink);
}

@media (max-width: 850px) {
  nav {
    display: none;
  }

  .hero,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 0;
    padding-top: 44px;
  }

  .hero-stats,
  .card-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 520px;
  }

  .headlight-card {
    width: calc(100% - 38px);
  }

  .after-card {
    left: 38px;
  }

  footer {
    display: grid;
  }
}