/* ============================================================
   Vorsprung Parts — shared stylesheet
   Clean & modern theme for an Audi parts store
   ============================================================ */

:root {
  --bg: #ffffff;
  --bg-alt: #f5f6f8;
  --bg-dark: #0f1114;
  --ink: #14171a;
  --ink-soft: #55606b;
  --line: #e4e7eb;
  --brand: #bb0a30;      /* Audi-style red accent */
  --brand-dark: #8f0725;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(15, 17, 20, 0.08);
  --shadow-lg: 0 18px 48px rgba(15, 17, 20, 0.14);
  --maxw: 1160px;
  --font: "Inter", "Segoe UI", system-ui, -apple-system, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; display: block; }

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

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; font-weight: 700; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.5rem); }
h3 { font-size: 1.2rem; }

p { color: var(--ink-soft); }

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 14px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.98rem;
  padding: 13px 26px;
  border-radius: 999px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-light { background: #fff; color: var(--ink); }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.brand .rings {
  display: flex;
  gap: -6px;
}
.brand .rings span {
  width: 15px; height: 15px;
  border: 2.5px solid var(--ink);
  border-radius: 50%;
  margin-left: -6px;
}
.brand .rings span:first-child { margin-left: 0; }
.nav-links { display: flex; align-items: center; gap: 30px; list-style: none; }
.nav-links a {
  font-weight: 500;
  font-size: 0.96rem;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav-links a.active { font-weight: 600; }
.nav-cta { margin-left: 8px; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--ink);
}

/* ---------- Sections ---------- */
section { padding: 84px 0; }
.section-head { max-width: 640px; margin: 0 auto 52px; text-align: center; }
.section-head p { margin-top: 14px; font-size: 1.08rem; }

.bg-alt { background: var(--bg-alt); }

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 88px;
  background:
    radial-gradient(1000px 480px at 78% -10%, rgba(187,10,48,0.10), transparent 60%),
    linear-gradient(180deg, #fff 0%, var(--bg-alt) 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero h1 { margin-bottom: 20px; }
.hero p.lead { font-size: 1.18rem; margin-bottom: 30px; max-width: 40ch; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.hero-stats .stat strong { display: block; font-size: 1.9rem; letter-spacing: -0.03em; }
.hero-stats .stat span { font-size: 0.9rem; color: var(--ink-soft); }
.hero-visual {
  background: linear-gradient(145deg, #1a1d21, #0f1114);
  border-radius: 24px;
  min-height: 380px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-visual .big-rings {
  display: flex;
}
.hero-visual .big-rings span {
  width: 92px; height: 92px;
  border: 6px solid rgba(255,255,255,0.85);
  border-radius: 50%;
  margin-left: -34px;
}
.hero-visual .big-rings span:first-child { margin-left: 0; }
.hero-visual::after {
  content: "PRECISION ENGINEERED";
  position: absolute;
  bottom: 26px;
  left: 0; right: 0;
  text-align: center;
  color: rgba(255,255,255,0.35);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
}

/* ---------- Feature cards ---------- */
.grid { display: grid; gap: 26px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card .icon {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: rgba(187,10,48,0.10);
  color: var(--brand);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 18px;
}
.card h3 { margin-bottom: 8px; }
.card p { font-size: 0.96rem; }

/* ---------- Product cards ---------- */
.product-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  display: flex;
  flex-direction: column;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.product-card .thumb {
  height: 158px;
  background: linear-gradient(145deg, #23272c, #14171a);
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.9);
  font-size: 2rem;
}
.product-card .body { padding: 20px 22px 24px; flex: 1; display: flex; flex-direction: column; }
.product-card h3 { font-size: 1.08rem; margin-bottom: 6px; }
.product-card p { font-size: 0.92rem; flex: 1; }
.product-card .meta {
  margin-top: 16px;
  display: flex; align-items: center; justify-content: space-between;
}
.product-card .price { font-weight: 700; color: var(--ink); }
.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--brand);
  background: rgba(187,10,48,0.09);
  padding: 4px 10px;
  border-radius: 999px;
}

/* ---------- Split / About ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split .visual {
  background: linear-gradient(145deg, #1a1d21, #0f1114);
  border-radius: 20px;
  min-height: 340px;
  box-shadow: var(--shadow);
  display: flex; align-items: center; justify-content: center;
}
.split .visual .big-rings span {
  width: 70px; height: 70px;
  border: 5px solid rgba(255,255,255,0.8);
  border-radius: 50%;
  margin-left: -26px;
  display: inline-block;
}
.split .visual .big-rings span:first-child { margin-left: 0; }
.split ul { list-style: none; margin-top: 22px; }
.split ul li {
  padding-left: 30px;
  position: relative;
  margin-bottom: 12px;
  color: var(--ink-soft);
}
.split ul li::before {
  content: "✓";
  position: absolute; left: 0;
  color: var(--brand);
  font-weight: 700;
}

/* ---------- Values ---------- */
.value-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--brand);
  letter-spacing: -0.03em;
  margin-bottom: 6px;
}

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--bg-dark);
  color: #fff;
  border-radius: 24px;
  padding: 60px 48px;
  text-align: center;
}
.cta-band h2 { color: #fff; margin-bottom: 14px; }
.cta-band p { color: rgba(255,255,255,0.72); max-width: 48ch; margin: 0 auto 28px; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 7px; }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.96rem;
  color: var(--ink);
  background: #fff;
  transition: border-color 0.15s ease;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--brand);
}
.field textarea { resize: vertical; min-height: 130px; }
.contact-info .info-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.contact-info .info-item:last-child { border-bottom: none; }
.contact-info .info-item .ic {
  width: 42px; height: 42px; flex: none;
  border-radius: 11px;
  background: rgba(187,10,48,0.10);
  color: var(--brand);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.15rem;
}
.contact-info .info-item strong { display: block; margin-bottom: 2px; }
.contact-info .info-item span { color: var(--ink-soft); font-size: 0.95rem; }
.form-note { font-size: 0.85rem; color: var(--ink-soft); margin-top: 6px; }

/* ---------- Page banner ---------- */
.page-banner {
  padding: 72px 0 60px;
  background:
    radial-gradient(800px 360px at 82% -20%, rgba(187,10,48,0.10), transparent 60%),
    var(--bg-alt);
  text-align: center;
}
.page-banner p { max-width: 56ch; margin: 14px auto 0; font-size: 1.08rem; }
.crumb { font-size: 0.85rem; color: var(--ink-soft); margin-bottom: 12px; }
.crumb a:hover { color: var(--brand); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 44px;
}
.site-footer .brand { color: #fff; margin-bottom: 14px; }
.site-footer .brand .rings span { border-color: #fff; }
.site-footer p { color: rgba(255,255,255,0.6); font-size: 0.95rem; max-width: 32ch; }
.footer-col h4 {
  color: #fff;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: rgba(255,255,255,0.65); font-size: 0.95rem; transition: color 0.15s ease; }
.footer-col ul li a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.86rem;
  color: rgba(255,255,255,0.5);
}
.disclaimer { font-size: 0.78rem; color: rgba(255,255,255,0.4); margin-top: 14px; max-width: 60ch; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-grid, .split, .contact-grid { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-visual { min-height: 280px; order: -1; }
}
@media (max-width: 640px) {
  section { padding: 60px 0; }
  .nav-links {
    display: none;
    position: absolute;
    top: 68px; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 8px 0;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; padding: 6px 24px; }
  .nav-toggle { display: block; }
  .grid-4, .grid-3, .grid-2, .footer-grid { grid-template-columns: 1fr; }
  .cta-band { padding: 44px 24px; }
  .hero-stats { gap: 26px; }
}