:root {
  --ink: #17120f;
  --muted: #6f635c;
  --paper: #fff9f2;
  --surface: #ffffff;
  --line: #eaded2;
  --red: #b71925;
  --deep-red: #721018;
  --gold: #d8aa4f;
  --green: #2f6e4f;
  --black: #111111;
  --shadow: 0 22px 70px rgba(41, 20, 15, 0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, "Noto Sans SC", "Microsoft YaHei", sans-serif;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
h1, h2, h3, h4, p { overflow-wrap: anywhere; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 14px clamp(18px, 5vw, 68px);
  background: rgba(255, 249, 242, 0.88);
  border-bottom: 1px solid rgba(234, 222, 210, 0.8);
  backdrop-filter: blur(18px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.06rem;
  font-weight: 800;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--red);
  color: white;
  border-radius: 8px;
  font-weight: 900;
}
nav {
  display: flex;
  justify-content: center;
  gap: clamp(14px, 3vw, 34px);
  color: var(--muted);
  font-size: 0.95rem;
}
nav a:hover { color: var(--red); }
.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}
select {
  min-width: 112px;
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  color: var(--ink);
  font-weight: 700;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.94fr) minmax(320px, 1.06fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: center;
  min-height: calc(100vh - 64px);
  padding: clamp(44px, 7vw, 94px) clamp(18px, 5vw, 68px) 54px;
  background:
    linear-gradient(110deg, rgba(255,249,242,1) 0%, rgba(255,249,242,0.92) 48%, rgba(183,25,37,0.08) 100%),
    radial-gradient(circle at 92% 22%, rgba(216,170,79,0.18), transparent 30%);
}
.hero-copy { max-width: 710px; }
.eyebrow {
  margin: 0 0 12px;
  color: var(--red);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}
h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.7rem, 6vw, 5.8rem);
  line-height: 0.98;
}
.lead {
  max-width: 620px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.5vw, 1.22rem);
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 800;
}
.button-primary { background: var(--red); color: white; }
.button-secondary { border: 1px solid var(--line); background: white; color: var(--ink); }
.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 34px 0 0;
}
.stats div {
  padding: 14px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.stats dt { font-size: 1rem; font-weight: 900; }
.stats dd { margin: 6px 0 0; color: var(--muted); font-size: 0.82rem; }
.hero-media {
  padding: clamp(10px, 2vw, 18px);
  background: linear-gradient(140deg, var(--black), var(--deep-red));
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.hero-media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 6px;
}

.section { padding: clamp(58px, 8vw, 104px) clamp(18px, 5vw, 68px); }
.section-heading { max-width: 820px; margin-bottom: 34px; }
.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.05;
}
.section-heading p:not(.eyebrow) {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1.04rem;
  line-height: 1.7;
}
.product-section, .gallery-section { background: var(--surface); }
.product-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.18fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}
.product-layout > img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.product-layout h3 { margin: 0 0 18px; font-size: 1.4rem; }
.feature-list, .proof-grid { display: grid; gap: 14px; }
.feature-card, .proof-card {
  position: relative;
  padding: 22px;
  background: #fffaf5;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.feature-icon {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-bottom: 14px;
  background: var(--green);
  color: white;
  border-radius: 50%;
  font-weight: 900;
}
.feature-card h3, .proof-card h3 { margin: 0; font-size: 1.08rem; }
.feature-card p, .proof-card p { margin: 10px 0 0; color: var(--muted); line-height: 1.65; }

.standards-section { background: #191312; color: white; }
.standards-section .section-heading p:not(.eyebrow), .standards-section .standard-item p { color: rgba(255, 255, 255, 0.74); }
.standards-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
.standard-item {
  min-height: 106px;
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
}
.standard-item span { color: var(--gold); font-weight: 900; }
.standard-item p { margin: 10px 0 0; line-height: 1.45; }
.certificate-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}
.certificate-strip img {
  width: 100%;
  max-height: 290px;
  object-fit: contain;
  padding: 14px;
  background: white;
  border-radius: 8px;
}
.proof-section { background: #fff4e8; }
.proof-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.gallery figure {
  margin: 0;
  background: #f7f1ea;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.gallery img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
}
.faq-section { background: var(--paper); }
.faq-list { display: grid; gap: 10px; max-width: 920px; }
details {
  background: white;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px 20px;
}
summary { cursor: pointer; font-weight: 900; }
details p { margin: 12px 0 0; color: var(--muted); line-height: 1.7; }
footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(18px, 5vw, 68px);
  background: var(--black);
  color: white;
}
footer p { max-width: 780px; margin: 0; color: rgba(255, 255, 255, 0.72); line-height: 1.55; }

@media (max-width: 980px) {
  .site-header { grid-template-columns: 1fr auto; }
  nav { grid-column: 1 / -1; justify-content: flex-start; overflow-x: auto; }
  .hero, .product-layout { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .hero-media img { aspect-ratio: 16 / 10; }
  .standards-grid, .proof-grid, .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .site-header { gap: 12px; }
  .language-switch span {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }
  .stats, .standards-grid, .certificate-strip, .proof-grid, .gallery { grid-template-columns: 1fr; }
  h1 { font-size: clamp(2.35rem, 14vw, 3.4rem); }
  footer { display: block; }
  footer p { margin-top: 10px; }
}