:root {
  --bg: #ffffff;
  --bg-soft: #f6f6f4;
  --ink: #111111;
  --muted: #6b6b6b;
  --line: #e4e3e0;
  --accent: #d6443c;
  --radius: 14px;
  --container: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, "Inter", "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

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

/* HEADER */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.02em; }
.logo .dot { color: var(--accent); }
.nav { display: flex; gap: 32px; }
.nav a { font-size: 0.95rem; font-weight: 500; color: var(--muted); transition: color .15s; }
.nav a:hover { color: var(--ink); }

/* MOBILE NAV */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: transform .2s, opacity .2s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile {
  display: none;
  flex-direction: column;
  border-top: 1px solid var(--line);
  background: #fff;
}
.nav-mobile.active { display: flex; }
.nav-mobile a {
  padding: 16px 24px;
  font-size: 1rem;
  font-weight: 500;
  border-bottom: 1px solid var(--line);
}
.nav-mobile a:last-child { border-bottom: none; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .15s;
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--accent); }
.btn-ghost { color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-outline { border: 1px solid var(--ink); width: 100%; margin-top: 24px; }
.btn-outline:hover { background: var(--ink); color: #fff; }

/* HERO */
.hero { padding: 90px 0 60px; }
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.hero-text h1 {
  font-size: clamp(2.4rem, 4.5vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin-bottom: 22px;
}
.lead { font-size: 1.1rem; color: var(--muted); max-width: 50ch; margin-bottom: 32px; }
.hero-cta { display: flex; gap: 14px; margin-bottom: 56px; }
.hero-stats { display: flex; gap: 40px; border-top: 1px solid var(--line); padding-top: 24px; }
.hero-stats div { display: flex; flex-direction: column; gap: 4px; }
.hero-stats strong { font-size: 1.6rem; font-weight: 800; }
.hero-stats span { font-size: 0.8rem; color: var(--muted); }

.hero-visual {
  background: var(--bg-soft);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 480px;
  overflow: hidden;
}
.product-shot { width: 100%; height: 100%; object-fit: cover; border-radius: 24px; }

/* TRUST BAR */
.trust-bar { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 22px 0; }
.trust-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

/* SECTION HEAD */
.section-head { max-width: 640px; margin: 0 auto 56px; text-align: center; }
.section-head h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 14px; }
.section-head p { color: var(--muted); font-size: 1.05rem; }

/* PRODUCTS */
.products { padding: 100px 0; }
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.product-grid-single {
  grid-template-columns: minmax(280px, 420px);
  justify-content: center;
}
.product-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  transition: box-shadow .2s, transform .2s;
}
.product-card:hover { box-shadow: 0 12px 32px rgba(0,0,0,0.06); transform: translateY(-4px); }
.product-swiper {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
  margin: -32px -32px 24px;
  aspect-ratio: 1 / 1;
}
.product-swiper-track {
  display: flex;
  width: 300%;
  height: 100%;
  transition: transform .35s ease;
}
.product-swiper-track img {
  width: 33.3333%;
  height: 100%;
  object-fit: cover;
  flex-shrink: 0;
  display: block;
}
.swiper-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.85);
  color: var(--ink);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .15s;
}
.swiper-arrow:hover { background: #fff; }
.swiper-prev { left: 12px; }
.swiper-next { right: 12px; }
.swiper-dots {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
}
.swiper-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(255,255,255,0.6);
  border: 1px solid rgba(0,0,0,0.1);
  cursor: pointer;
  transition: background .15s;
}
.swiper-dot.active { background: var(--ink); }

.product-card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.product-no { font-size: 1.8rem; font-weight: 800; }
.product-tag {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--bg-soft);
  padding: 6px 12px;
  border-radius: 999px;
}
.product-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 10px; }
.product-card p { color: var(--muted); font-size: 0.95rem; margin-bottom: 20px; }
.spec-list { list-style: none; border-top: 1px solid var(--line); padding-top: 16px; display: flex; flex-direction: column; gap: 10px; }
.spec-list li { display: flex; justify-content: space-between; font-size: 0.9rem; }
.spec-list span { color: var(--muted); }

/* VIDEO BANNER */
.video-banner {
  position: relative;
  width: 100%;
  height: 80vh;
  overflow: hidden;
}
.video-banner video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(100%);
}
.video-banner-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: rgba(0,0,0,0.25);
  color: #fff;
  cursor: pointer;
  transition: background .2s;
}
.video-banner-overlay:hover { background: rgba(0,0,0,0.4); }
.video-banner-overlay .eyebrow { color: #fff; opacity: 0.8; }
.video-banner-overlay h2 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}
@media (max-width: 900px) {
  .video-banner { height: 60vh; }
}

/* SCIENCE */
.science { background: var(--bg-soft); padding: 100px 0; }
.science-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: start;
}
.science-text h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); font-weight: 800; letter-spacing: -0.02em; margin: 12px 0 18px; }
.science-text > p { color: var(--muted); font-size: 1.05rem; max-width: 52ch; margin-bottom: 36px; }

.accordion-item { border-bottom: 1px solid var(--line); }
.accordion-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  padding: 20px 0;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  color: var(--ink);
}
.accordion-icon { font-size: 1.3rem; font-weight: 400; color: var(--muted); transition: transform .2s; }
.accordion-item.active .accordion-icon { transform: rotate(45deg); }
.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease;
}
.accordion-item.active .accordion-panel { max-height: 320px; }
.accordion-panel p { color: var(--muted); padding-bottom: 20px; font-size: 0.95rem; max-width: 56ch; }

.study-links { display: flex; flex-direction: column; gap: 8px; margin-top: 24px; }
.study-links a { color: var(--accent); font-weight: 600; font-size: 0.85rem; text-decoration: underline; }
.study-links a:hover { color: var(--ink); }

.science-visual { position: sticky; top: 100px; display: flex; flex-direction: column; gap: 20px; }
.science-photo { width: 100%; border-radius: var(--radius); display: block; object-fit: cover; max-height: 280px; }
.chart-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.chart-card h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 18px; }
.chart { width: 100%; height: auto; color: var(--ink); }
.chart-legend { display: flex; gap: 20px; margin-top: 16px; font-size: 0.85rem; color: var(--muted); }
.chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; }
.dot-red { background: var(--accent); }
.dot-dark { background: var(--ink); }

/* IMPRESSUM */
.impressum { padding: 100px 0; }
.impressum-content { max-width: 480px; margin: 0 auto; text-align: center; color: var(--muted); line-height: 1.7; }
.agb-content { max-width: 720px; text-align: left; }
.agb-content h3 { color: var(--ink); font-size: 1.05rem; font-weight: 700; margin: 28px 0 8px; }
.agb-content h3:first-child { margin-top: 0; }
.agb-content h4 { color: var(--ink); font-size: 0.95rem; font-weight: 700; margin: 18px 0 8px; }
.agb-content ul { margin: 0 0 0 20px; color: var(--muted); }
.agb-content p { margin-bottom: 0; }
.agb-note { margin-top: 32px; font-size: 0.85rem; font-style: italic; }

/* FOOTER */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-inner p { color: var(--muted); font-size: 0.85rem; }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-inner a { color: var(--muted); font-size: 0.85rem; text-decoration: underline; }
.footer-inner a:hover { color: var(--ink); }

/* RESPONSIVE */
@media (max-width: 900px) {
  .nav { display: none; }
  .nav-toggle { display: flex; }
  .hero-inner, .science-inner { grid-template-columns: 1fr; }
  .hero-visual { min-height: 320px; order: -1; }
  .product-grid { grid-template-columns: 1fr; }
  .science-visual { position: static; }
}

@media (max-width: 600px) {
  .container { padding: 0 18px; }
  .header-inner { height: 64px; }
  .btn-primary.btn { padding: 10px 18px; font-size: 0.85rem; }

  .hero { padding: 32px 0 40px; }
  .hero-inner { gap: 28px; }
  .hero-visual { min-height: 260px; }
  .lead { font-size: 1rem; max-width: none; margin-bottom: 24px; }
  .hero-cta { flex-direction: column; gap: 10px; margin-bottom: 32px; }
  .hero-cta .btn { width: 100%; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .hero-stats strong { font-size: 1.3rem; }

  .video-banner { height: 50vh; }
  .video-banner-overlay h2 { font-size: clamp(1.6rem, 8vw, 2.4rem); padding: 0 16px; }

  .section-head { margin-bottom: 36px; }
  .section-head p { font-size: 0.95rem; }

  .products, .science, .impressum { padding: 60px 0; }
  .product-card { padding: 24px; }
  .product-swiper { margin: -24px -24px 24px; }

  .science-photo { max-height: 200px; }
  .chart-card { padding: 20px; }
  .chart-legend { flex-direction: column; gap: 8px; }

  .footer-inner { flex-direction: column; text-align: center; gap: 12px; }
  .footer-links { justify-content: center; }
}