/* ========================================
   YIHAN IMP. & EXP. CO., LTD.
   Industrial Gunmetal + Brushed Steel
   炮铜灰 · 拉丝金属 · 暗红古铜 · 大佬风范
   ======================================== */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Core — Gunmetal spectrum (industrial steel, not flat black) */
  --gunmetal:        #1a1d20;  /* Deep gunmetal — hero/nav */
  --gunmetal-dark:   #121518;  /* Darkest — footer */
  --gunmetal-light:  #22262a;  /* Mid-tone — quality section */
  --gunmetal-pale:   #2d3136;  /* Lighter accent on dark */

  /* Accent — aged brass / bronze */
  --brass:         #b8925e;
  --brass-light:   #d4b87a;
  --brass-deep:    #8c6d3f;
  --brass-muted:   #6b5535;

  /* Surfaces */
  --surface:       #f2f0eb;
  --surface-alt:   #e8e4dc;
  --paper:         #fafaf8;
  --border:        #d4cfc5;
  --border-dark:   rgba(255,255,255,0.08);
  --border-mid:    rgba(255,255,255,0.04);

  /* Text */
  --text:          #2a2722;
  --text-soft:     #6b6560;
  --text-muted:    #9e9890;

  /* Typography */
  --font-display: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --max-width:    1280px;
  --nav-height:   68px;
}

/* === Global Textured Dark Background (CSS-only brushed steel) === */
.bg-gunmetal {
  background-color: var(--gunmetal);
  background-image:
    /* Subtle horizontal brushed lines */
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(255,255,255,0.008) 2px,
      rgba(255,255,255,0.008) 4px
    ),
    /* Diagonal micro-carbon weave */
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 1px,
      rgba(255,255,255,0.006) 1px,
      rgba(255,255,255,0.006) 2px
    ),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 1px,
      rgba(255,255,255,0.006) 1px,
      rgba(255,255,255,0.006) 2px
    ),
    /* Metal sheen gradient */
    linear-gradient(
      180deg,
      rgba(255,255,255,0.03) 0%,
      transparent 30%,
      transparent 70%,
      rgba(0,0,0,0.05) 100%
    );
}

.bg-gunmetal-dark {
  background-color: var(--gunmetal-dark);
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(255,255,255,0.006) 2px,
      rgba(255,255,255,0.006) 4px
    ),
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 1px,
      rgba(255,255,255,0.004) 1px,
      rgba(255,255,255,0.004) 2px
    ),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 1px,
      rgba(255,255,255,0.004) 1px,
      rgba(255,255,255,0.004) 2px
    ),
    linear-gradient(
      180deg,
      rgba(255,255,255,0.02) 0%,
      transparent 40%,
      rgba(0,0,0,0.06) 100%
    );
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  color: var(--text);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.01em;
}

/* --- Typography --- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  color: var(--gunmetal-dark);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

h1 { font-size: clamp(2.4rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); margin-bottom: 1.25rem; }
h3 { font-size: 1.1rem; font-weight: 700; letter-spacing: -0.015em; }
h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--text-soft); margin-bottom: 1rem; font-weight: 700; }

a { color: var(--brass-deep); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--brass); }

img { max-width: 100%; height: auto; display: block; }
img { image-rendering: auto; -webkit-backface-visibility: hidden; backface-visibility: hidden; }

p { margin-bottom: 1rem; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

section { padding: 5rem 0; }

/* --- Navigation --- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(18, 21, 24, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.site-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-brand img {
  height: 36px;
  width: auto;
  filter: brightness(0) invert(1);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: rgba(255,255,255,0.6);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 700;
  position: relative;
  padding-bottom: 4px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brass);
  transition: width 0.25s ease;
}

.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--brass-light); }
.nav-links a.active::after { width: 100%; background: var(--brass); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  margin: 5px 0;
  transition: all 0.3s ease;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background-color: var(--gunmetal);
  background-image:
    /* Brushed metal horizontal grain */
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(255,255,255,0.012) 2px,
      rgba(255,255,255,0.012) 4px
    ),
    /* Micro carbon weave */
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 1px,
      rgba(255,255,255,0.008) 1px,
      rgba(255,255,255,0.008) 2px
    ),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 1px,
      rgba(255,255,255,0.008) 1px,
      rgba(255,255,255,0.008) 2px
    ),
    /* Warm spotlight from top */
    radial-gradient(ellipse at 50% 0%, rgba(184,146,94,0.06) 0%, transparent 60%),
    /* Subtle vignette */
    radial-gradient(ellipse at 50% 50%, transparent 40%, rgba(0,0,0,0.3) 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
  margin-top: 0;
  padding: calc(var(--nav-height) + 4rem) 0 4rem;
}

/* Brass aura glow */
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: 
    radial-gradient(ellipse at 25% 40%, rgba(184, 146, 94, 0.08) 0%, transparent 55%),
    radial-gradient(ellipse at 75% 60%, rgba(139, 26, 26, 0.04) 0%, transparent 50%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.01) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.01) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  opacity: 0.5;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-content h1 {
  color: #fff;
  margin-bottom: 1.5rem;
}

.hero-content h1 em {
  font-style: normal;
  color: var(--brass-light);
}

.text-red {
  color: #8b1a1a;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.8;
  max-width: 440px;
  margin-bottom: 2rem;
}

.hero-meta {
  display: flex;
  gap: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.hero-stat h3 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  color: var(--brass-light);
  font-weight: 800;
}

.hero-stat p {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: rgba(255,255,255,0.35);
  margin: 0;
  font-weight: 700;
}

.hero-visual {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 0.5rem;
  aspect-ratio: 4/3;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.82;
  transition: opacity 0.4s ease, transform 0.4s ease;
  border: 1px solid rgba(255,255,255,0.04);
  filter: contrast(1.08) saturate(0.9);
}

.hero-visual img:hover {
  opacity: 1;
  transform: scale(1.04);
}

.hero-visual img:nth-child(1) { grid-column: 1; grid-row: 1 / 3; }
.hero-visual img:nth-child(2) { grid-column: 2; grid-row: 1; }
.hero-visual img:nth-child(3) { grid-column: 2; grid-row: 2; }

/* --- Section Titles --- */
.section-label {
  display: inline-block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--brass-deep);
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--text-soft);
  max-width: 520px;
  margin: 0 auto;
  font-size: 1rem;
}

/* --- About Teaser --- */
.about-teaser {
  background: var(--paper);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.about-grid > div:first-child img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border: 1px solid var(--border);
  filter: contrast(1.06);
}

.about-text p {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.8;
}

.about-text .link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--brass-deep);
  margin-top: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: gap 0.3s ease;
}

.about-text .link-arrow:hover { gap: 0.9rem; color: var(--brass); }
.about-text .link-arrow::after { content: '→'; font-size: 1.1rem; }

/* --- Categories Grid --- */
.categories-section {
  background: var(--surface-alt);
}

.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 1.25rem;
}

.cat-card {
  background: var(--paper);
  padding: 2rem 1.25rem;
  text-align: center;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  cursor: pointer;
  border: 1px solid var(--border);
}

.cat-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
  border-color: var(--brass);
}

.cat-card .cat-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 1rem;
  color: var(--brass-deep);
  display: flex;
  align-items: center;
  justify-content: center;
}

.cat-card h3 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--gunmetal-dark);
}

.cat-card .count {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
}

/* --- Products Grid (Homepage Featured) --- */
.products-section {
  background: var(--paper);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.75rem;
}

.product-card {
  background: var(--surface);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--border);
}

.product-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 35px rgba(0,0,0,0.07);
}

.product-card .img-wrap {
  aspect-ratio: 4/3;
  overflow: hidden;
  background: #ffffff;
  position: relative;
}

.product-card .img-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(255,255,255,0) 40%, rgba(0,0,0,0.02) 100%);
  pointer-events: none;
}

.product-card .img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 1.25rem;
  transition: transform 0.45s ease;
  image-rendering: auto;
  filter: contrast(1.03);
}

.product-card:hover .img-wrap img {
  transform: scale(1.06);
}

.product-card .info {
  padding: 1.25rem 1.5rem;
}

.product-card .info h3 {
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.3rem;
  color: var(--gunmetal-dark);
}

.product-card .info .standard {
  font-size: 0.7rem;
  color: var(--brass-deep);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
}

.product-card .info .cat-tag {
  display: inline-block;
  font-size: 0.66rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-top: 0.4rem;
  font-weight: 700;
  text-transform: uppercase;
}

/* --- Quality Teaser --- */
.quality-teaser {
  background-color: var(--gunmetal-light);
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.007) 2px, rgba(255,255,255,0.007) 4px),
    repeating-linear-gradient(45deg, transparent, transparent 1px, rgba(255,255,255,0.005) 1px, rgba(255,255,255,0.005) 2px),
    repeating-linear-gradient(-45deg, transparent, transparent 1px, rgba(255,255,255,0.005) 1px, rgba(255,255,255,0.005) 2px),
    linear-gradient(180deg, rgba(255,255,255,0.025) 0%, transparent 40%, rgba(0,0,0,0.04) 100%);
  color: #fff;
}

.quality-teaser h2 { color: #fff; }
.quality-teaser .section-header p { color: rgba(255,255,255,0.4); }

.quality-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
  text-align: center;
}

.quality-points .qp-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  color: var(--brass-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.quality-points h3 {
  color: #fff;
  font-size: 1.05rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.quality-points p {
  color: rgba(255,255,255,0.45);
  font-size: 0.9rem;
  line-height: 1.65;
}

/* --- Contact CTA --- */
.contact-cta {
  background: var(--paper);
  text-align: center;
  padding: 6rem 0;
}

.contact-cta h2 { margin-bottom: 0.75rem; }
.contact-cta p { color: var(--text-soft); max-width: 500px; margin: 0 auto 1.5rem; }

.contact-inline {
  display: flex;
  justify-content: center;
  gap: 4rem;
  margin-top: 3rem;
  flex-wrap: wrap;
}

.contact-inline .ci-item {
  text-align: center;
}

.contact-inline .ci-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  font-weight: 700;
}

.contact-inline .ci-value {
  font-weight: 700;
  font-size: 1rem;
  color: var(--gunmetal-dark);
}

/* --- Footer --- */
.site-footer {
  background-color: var(--gunmetal-dark);
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.005) 2px, rgba(255,255,255,0.005) 4px),
    linear-gradient(180deg, rgba(0,0,0,0.08) 0%, transparent 30%, transparent 70%, rgba(0,0,0,0.12) 100%);
  color: rgba(255,255,255,0.35);
  padding: 3rem 0;
  font-size: 0.8rem;
  border-top: 1px solid rgba(255,255,255,0.04);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 4rem;
}

.footer-brand {
  font-weight: 800;
  font-size: 1.05rem;
  color: #fff;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.footer-address {
  font-size: 0.78rem;
  line-height: 1.8;
}

.footer-links h4 {
  color: #fff;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: 0.1em;
}

.footer-links ul {
  list-style: none;
}

.footer-links ul li { margin-bottom: 0.5rem; }

.footer-links a {
  color: rgba(255,255,255,0.35);
  font-size: 0.8rem;
  transition: color 0.2s ease;
}

.footer-links a:hover { color: var(--brass-light); }

.footer-bottom {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.04);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* --- Page Header (subpages) --- */
.page-header {
  background-color: var(--gunmetal);
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.008) 2px, rgba(255,255,255,0.008) 4px),
    linear-gradient(180deg, rgba(184,146,94,0.04) 0%, transparent 50%, rgba(0,0,0,0.1) 100%);
  color: #fff;
  padding: calc(var(--nav-height) + 3rem) 0 2.5rem;
  text-align: center;
  position: relative;
}

.page-header::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.008) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.008) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.page-header h1 {
  color: #fff;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 0.5rem;
}

.page-header .breadcrumb {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.3);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
}

.page-header .breadcrumb a { color: var(--brass-light); }
.page-header .breadcrumb span { color: rgba(255,255,255,0.5); }

/* --- Products Page --- */
.products-page { background: var(--paper); }

.cat-section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--border);
}

.cat-section:last-child { border-bottom: none; }

.cat-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--gunmetal-dark);
  margin-bottom: 2rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--brass);
  display: inline-block;
}

.cat-products {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.75rem;
}

.cat-products .product-card {
  background: var(--surface);
}

/* --- About Page --- */
.about-page { background: var(--paper); }

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-image img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border: 1px solid var(--border);
  filter: contrast(1.06);
}

.about-content h2 {
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  line-height: 1.3;
  font-weight: 800;
}

.about-content p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.about-stat-item h3 {
  font-size: 2rem;
  color: var(--brass-deep);
  font-weight: 800;
}

.about-stat-item p {
  font-size: 0.74rem;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
}

/* --- Quality Page --- */
.quality-page { background: var(--paper); }

.qc-process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.qc-step {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  position: relative;
  transition: border-color 0.3s ease;
}

.qc-step:hover {
  border-color: var(--brass);
}

.qc-step .step-num {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--brass-deep);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.qc-step h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.qc-step p {
  font-size: 0.84rem;
  color: var(--text-soft);
  line-height: 1.6;
}

.qc-images {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-top: 4rem;
}

.qc-images img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border: 1px solid var(--border);
  transition: transform 0.3s ease;
  filter: contrast(1.05);
}

.qc-images img:hover {
  transform: scale(1.03);
}

.qc-info-block {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
  margin-top: 4rem;
  padding: 3rem;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  align-items: start;
}

.qc-info-block img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border: 1px solid var(--border);
  filter: contrast(1.05);
}

.qc-info-text h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.qc-info-text ul {
  list-style: none;
  padding: 0;
}

.qc-info-text ul li {
  padding: 0.4rem 0;
  padding-left: 1.5rem;
  position: relative;
  font-weight: 500;
}

.qc-info-text ul li::before {
  content: '◆';
  position: absolute;
  left: 0;
  color: var(--brass);
  font-size: 0.45rem;
  top: 0.7rem;
}

/* --- Contact Page --- */
.contact-page { background: var(--paper); }

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.contact-info h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  font-weight: 800;
}

.contact-info .address-block {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--surface);
  border-left: 3px solid var(--brass);
}

.contact-info .address-block p {
  margin-bottom: 0.5rem;
  font-size: 0.92rem;
  line-height: 1.7;
  font-weight: 500;
}

.contact-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 2rem;
}

.contact-detail-item {
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
}

.contact-detail-item .label {
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  font-weight: 700;
}

.contact-detail-item .value {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--gunmetal-dark);
}

.contact-persons {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.25rem;
}

.person-card {
  background: var(--surface);
  padding: 2rem;
  text-align: center;
  border: 1px solid var(--border);
  transition: border-color 0.3s ease;
}

.person-card:hover {
  border-color: var(--brass);
}

.person-card .person-avatar {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: var(--gunmetal);
  color: var(--brass-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.6rem;
  margin: 0 auto 1rem;
}

.person-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.person-card .role {
  font-size: 0.7rem;
  color: var(--brass-deep);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  margin-bottom: 1rem;
}

.person-card .person-contact {
  font-size: 0.82rem;
  color: var(--text);
  line-height: 1.8;
  font-weight: 500;
}

.person-card .person-contact a {
  color: var(--gunmetal-dark);
}

.person-card .person-contact a:hover {
  color: var(--brass-deep);
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; gap: 3rem; }
  .hero-visual { aspect-ratio: 16/9; max-height: 380px; }
  .about-grid { grid-template-columns: 1fr; gap: 3rem; }
  .qc-process { grid-template-columns: repeat(2, 1fr); }
  .qc-info-block { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--gunmetal-dark);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  
  .quality-points { grid-template-columns: 1fr; gap: 2rem; }
  .contact-layout { grid-template-columns: 1fr; }
  .about-layout { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .qc-process { grid-template-columns: 1fr; }
  .qc-info-block { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .contact-inline { flex-direction: column; gap: 2rem; }
  .qc-images { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .container { padding: 0 1.25rem; }
  section { padding: 3rem 0; }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-details { grid-template-columns: 1fr; }
  .hero-meta { gap: 1.5rem; }
  .hero-stat h3 { font-size: 1.8rem; }
  .qc-images { grid-template-columns: 1fr; }
}