:root {
  --copper-rust: #8b5e3c;
  --copper-amber: #a66b3e;
  --graphite: #35312c;
  --graphite-soft: #6b665f;
  --concrete: #edeae4;
  --concrete-deep: #ded8cd;
  --white: #ffffff;
  --patina: #6b8a7a;

  --font-display: 'Archivo', 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;

  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--graphite);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--copper-rust);
  text-decoration: none;
}

a:hover {
  color: var(--copper-amber);
}

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--graphite);
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
}

h1 {
  font-size: clamp(2.1rem, 4.5vw, 3.4rem);
  line-height: 1.08;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
}

p {
  margin: 0 0 1em;
}

.eyebrow {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--copper-rust);
  margin: 0 0 0.6em;
  display: block;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  padding: 14px 26px;
  border-radius: 3px;
  border: 2px solid var(--copper-rust);
  background: var(--copper-rust);
  color: var(--white);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  background: var(--copper-amber);
  border-color: var(--copper-amber);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--graphite);
  border-color: var(--graphite);
}

.btn-outline:hover {
  background: var(--graphite);
  border-color: var(--graphite);
  color: var(--white);
}

.btn-outline-light {
  background: transparent;
  color: var(--concrete);
  border-color: var(--concrete);
}

.btn-outline-light:hover {
  background: var(--concrete);
  border-color: var(--concrete);
  color: var(--graphite);
}

.btn-on-copper {
  background: var(--concrete);
  color: var(--copper-rust);
  border-color: var(--concrete);
}

.btn-on-copper:hover {
  background: var(--white);
  border-color: var(--white);
  color: var(--copper-rust);
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--concrete-deep);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  display: flex;
  align-items: center;
}

.brand img {
  height: 56px;
  width: auto;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.main-nav a {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--graphite);
}

.main-nav a:hover {
  color: var(--copper-rust);
}

.lang-switch {
  display: flex;
  border: 1px solid var(--graphite);
  border-radius: 3px;
  overflow: hidden;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.78rem;
}

.lang-switch a {
  display: inline-block;
  background: transparent;
  padding: 7px 12px;
  color: var(--graphite);
  letter-spacing: 0.04em;
  text-decoration: none;
}

.lang-switch a:hover {
  color: var(--copper-rust);
}

.lang-switch a.active {
  background: var(--graphite);
  color: var(--white);
}

.lang-switch a.active:hover {
  color: var(--white);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--graphite);
  margin: 5px 0;
}

/* Hero */

.hero {
  background: var(--concrete);
  border-bottom: 1px solid var(--concrete-deep);
}

.hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding-top: 76px;
  padding-bottom: 76px;
}

.hero-copy p {
  font-size: 1.08rem;
  color: var(--graphite-soft);
  max-width: 46ch;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.hero-media {
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 18px 40px -18px rgba(53, 49, 44, 0.35);
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

/* Sections */

section {
  padding: 72px 0;
}

.section-alt {
  background: var(--concrete);
}

.referral-band {
  background: var(--copper-rust);
  color: var(--concrete);
}

.referral-band .eyebrow {
  color: var(--concrete);
  opacity: 0.85;
}

.referral-band h2 {
  color: var(--white);
}

.referral-band .about-body {
  color: var(--concrete);
  opacity: 0.92;
}

.about-body {
  max-width: 68ch;
  font-size: 1.05rem;
  color: var(--graphite-soft);
}

/* Product gallery */

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
  margin-top: 36px;
}

.gallery figure {
  margin: 0;
  background: var(--white);
  border: 1px solid var(--concrete-deep);
  border-radius: 4px;
  overflow: hidden;
}

.gallery img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.gallery figcaption {
  padding: 16px 18px 20px;
}

.gallery figcaption .cap-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  display: block;
  margin-bottom: 4px;
}

.gallery figcaption .cap-sub {
  font-size: 0.92rem;
  color: var(--graphite-soft);
}

/* Value props */

.values {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 36px;
}

.value-card {
  border-top: 3px solid var(--copper-rust);
  padding-top: 18px;
}

.value-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.value-card p {
  font-size: 0.95rem;
  color: var(--graphite-soft);
  margin: 0;
}

/* Contact */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
  margin-top: 36px;
}

.contact-card {
  background: var(--graphite);
  color: var(--concrete);
  border-radius: 6px;
  padding: 36px;
}

.contact-card h3 {
  color: var(--white);
  font-size: 1.1rem;
}

.contact-line {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 18px 0;
  font-size: 1.02rem;
}

.contact-line svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  stroke: var(--copper-amber);
}

.contact-line a {
  color: var(--concrete);
  font-weight: 600;
}

.contact-line a:hover {
  color: var(--copper-amber);
}

.contact-note {
  font-size: 0.88rem;
  color: var(--graphite-soft);
  margin-top: 22px;
}

.contact-wechat {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 22px 0 4px;
  padding-top: 22px;
  border-top: 1px solid rgba(237, 234, 228, 0.15);
}

.contact-wechat img {
  width: 76px;
  height: 76px;
  border-radius: 4px;
  flex-shrink: 0;
}

.contact-wechat-label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--white);
  margin-bottom: 4px;
}

.contact-wechat-sub {
  font-size: 0.85rem;
  color: var(--concrete);
  opacity: 0.75;
}

/* Footer */

.site-footer {
  background: var(--graphite);
  color: var(--concrete);
  padding: 40px 0;
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.site-footer a {
  color: var(--concrete);
}

.site-footer a:hover {
  color: var(--copper-amber);
}

.footer-links {
  display: flex;
  gap: 22px;
  font-size: 0.9rem;
}

.footer-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
}

.footer-legal {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(237, 234, 228, 0.15);
  font-size: 0.8rem;
  color: var(--graphite-soft);
}

/* Privacy page */

.legal {
  padding: 64px 0 96px;
  max-width: 74ch;
  margin: 0 auto;
}

.legal h2 {
  margin-top: 1.6em;
}

.legal p, .legal li {
  color: var(--graphite-soft);
  font-size: 1rem;
}

.legal .updated {
  color: var(--copper-rust);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Responsive */

@media (max-width: 900px) {
  .hero .wrap {
    grid-template-columns: 1fr;
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .hero-media {
    order: -1;
  }

  .gallery {
    grid-template-columns: 1fr 1fr;
  }

  .values {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 640px) {
  .main-nav {
    position: fixed;
    inset: 66px 0 auto 0;
    background: var(--white);
    border-bottom: 1px solid var(--concrete-deep);
    flex-direction: column;
    align-items: flex-start;
    padding: 18px 24px 26px;
    gap: 16px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
  }

  .main-nav.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-toggle {
    display: block;
  }

  .gallery {
    grid-template-columns: 1fr;
  }

  .values {
    grid-template-columns: 1fr;
  }

  section {
    padding: 52px 0;
  }
}