/* ===== CSS Variables ===== */
:root {
  --color-primary: #1a365d;
  --color-primary-light: #2a4a7f;
  --color-accent: #d4942b;
  --color-accent-hover: #b87a1e;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f6f8;
  --color-bg-dark: #0f1f33;
  --color-bg-section-dark: #162744;
  --color-text: #1a1a1a;
  --color-text-light: #5a5a5a;
  --color-text-on-dark: #e0e4ea;
  --color-border: #e2e4e8;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --radius: 6px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
  --transition: 0.25s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }

h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; }
h1 { font-size: 2.8rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.3rem; }

.section { padding: 80px 0; }
.section-dark {
  background: var(--color-bg-section-dark);
  color: var(--color-text-on-dark);
}
.section-dark h2 { color: #fff; }
.section-dark .section-header p { color: #b0bcc8; }

.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { margin-bottom: 12px; color: var(--color-primary); }
.section-header p { color: var(--color-text-light); font-size: 1.05rem; }
.section-dark .section-header h2 { color: #fff; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: 14px 0;
}
.site-header .container { display: flex; align-items: center; gap: 32px; }
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary) !important;
  white-space: nowrap;
}
.logo-icon { font-size: 1.5rem; color: var(--color-accent); }
.main-nav { display: flex; gap: 24px; flex: 1; }
.main-nav a {
  color: var(--color-text-light);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}
.main-nav a:hover,
.main-nav a.active { color: var(--color-primary); border-color: var(--color-accent); }
.lang-switch {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 6px 14px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-light);
  transition: all var(--transition);
}
.lang-switch:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.mobile-menu-btn { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; }

/* ===== Hero ===== */
.hero {
  padding: 100px 0 80px;
  text-align: center;
  background: linear-gradient(160deg, #f8f9fb 0%, #eef1f6 50%, #f8f9fb 100%);
}
.hero h1 { font-size: 3rem; margin-bottom: 16px; color: var(--color-primary); }
.hero .highlight { color: var(--color-accent); position: relative; }
.hero .highlight::after {
  content: '';
  position: absolute; bottom: 2px; left: 0; right: 0;
  height: 8px;
  background: rgba(212,148,43,0.2);
  z-index: -1;
}
.hero-sub { font-size: 1.1rem; color: var(--color-text-light); margin-bottom: 8px; }
.hero-desc { font-size: 1rem; color: var(--color-text-light); margin-bottom: 32px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; justify-content: center; }

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
}
.btn-primary { background: var(--color-accent); color: #fff !important; border-color: var(--color-accent); }
.btn-primary:hover { background: var(--color-accent-hover); border-color: var(--color-accent-hover); }
.btn-outline { border-color: var(--color-primary); color: var(--color-primary) !important; }
.btn-outline:hover { background: var(--color-primary); color: #fff !important; }
.btn-lg { padding: 16px 40px; font-size: 1.05rem; }

/* ===== Cards ===== */
.card-grid { display: grid; gap: 24px; }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-icon { font-size: 2.5rem; margin-bottom: 16px; }
.card h3 { margin-bottom: 8px; color: var(--color-primary); }
.card p { color: var(--color-text-light); font-size: 0.95rem; line-height: 1.6; }
.card-link { display: inline-block; margin-top: 16px; font-weight: 600; font-size: 0.9rem; color: var(--color-accent) !important; }
.card-link:hover { text-decoration: underline; }
.card-horizontal { display: flex; gap: 24px; }
.card-horizontal .card-body { flex: 1; }

.spec-list { list-style: none; margin-top: 12px; }
.spec-list li {
  font-size: 0.9rem; color: var(--color-text-light);
  padding: 3px 0 3px 16px; position: relative;
}
.spec-list li::before { content: '•'; position: absolute; left: 0; color: var(--color-accent); }

/* ===== Stats ===== */
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
.stat-number { display: block; font-size: 3rem; font-weight: 800; color: var(--color-accent); line-height: 1; margin-bottom: 4px; }
.stat-suffix, .stat-unit { font-size: 1.2rem; font-weight: 600; color: var(--color-accent); }
.stat-label { display: block; font-size: 0.95rem; color: #8a96a6; margin-top: 8px; }

/* ===== Printing ===== */
.printing-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; text-align: center; }
.feature-icon { font-size: 2.5rem; margin-bottom: 12px; display: block; }
.feature h4 { color: #fff; margin-bottom: 4px; }
.feature p { color: #b0bcc8; font-size: 0.9rem; }

/* ===== CTA ===== */
.cta {
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
}
.cta h2 { color: #fff !important; margin-bottom: 12px; }
.cta p { color: #c0cde0; margin-bottom: 28px; }

/* ===== Page Hero (sub-pages) ===== */
.page-hero {
  padding: 72px 0;
  background: linear-gradient(160deg, #f8f9fb 0%, #eef1f6 100%);
  text-align: center;
}
.page-hero h1 { color: var(--color-primary); margin-bottom: 8px; }
.page-hero p { color: var(--color-text-light); font-size: 1.05rem; }

/* ===== Prose ===== */
.prose { font-size: 1rem; line-height: 1.9; color: var(--color-text-light); max-width: 800px; margin: 0 auto; }
.prose p { margin-bottom: 16px; }

/* ===== About Page ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.about-text h3 { color: var(--color-primary); margin-bottom: 12px; margin-top: 32px; }
.about-text h3:first-child { margin-top: 0; }

.equipment-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.equip-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}
.equip-card:hover { background: rgba(255,255,255,0.1); transform: translateY(-2px); }
.equip-card h3 { color: #fff; margin-bottom: 8px; font-size: 1.05rem; }
.equip-card p { color: #b0bcc8; font-size: 0.9rem; }
.equip-desc { color: #708090 !important; font-size: 0.85rem !important; margin-top: 4px; }

.certs-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.cert-item {
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition);
}
.cert-item:hover { box-shadow: var(--shadow-md); }
.cert-icon { font-size: 2.5rem; display: block; margin-bottom: 12px; }
.cert-item h4 { color: var(--color-primary); margin-bottom: 4px; }
.cert-item p { color: var(--color-text-light); font-size: 0.9rem; }
.certs-note { text-align: center; margin-top: 24px; color: #999; font-size: 0.85rem; font-style: italic; }

/* ===== Product Pages ===== */
.product-hero {
  padding: 72px 0;
  background: linear-gradient(160deg, #f8f9fb 0%, #eef1f6 100%);
  text-align: center;
}
.product-hero .product-icon { font-size: 3.5rem; display: block; margin-bottom: 16px; }
.product-hero h1 { color: var(--color-primary); margin-bottom: 8px; }
.product-hero p { color: var(--color-text-light); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

.product-detail { padding: 64px 0; }
.product-detail .container { max-width: 900px; }
.product-detail h2 { color: var(--color-primary); margin-bottom: 16px; margin-top: 40px; }
.product-detail h2:first-of-type { margin-top: 0; }
.product-detail p { color: var(--color-text-light); margin-bottom: 16px; line-height: 1.8; }

.spec-table { width: 100%; border-collapse: collapse; margin: 24px 0 40px; }
.spec-table th, .spec-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}
.spec-table th { background: var(--color-bg-alt); font-weight: 600; color: var(--color-primary); width: 30%; }
.spec-table td { color: var(--color-text-light); }

.app-list { list-style: none; margin-bottom: 40px; }
.app-list li {
  padding: 10px 0 10px 24px;
  position: relative;
  color: var(--color-text-light);
  line-height: 1.6;
  border-bottom: 1px solid var(--color-border);
}
.app-list li::before { content: '✓'; position: absolute; left: 0; color: var(--color-accent); font-weight: 700; }

/* ===== Contact Page ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info h2 { margin-bottom: 16px; }
.contact-item {
  display: flex; gap: 16px; padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}
.contact-item:last-child { border-bottom: none; }
.contact-item .ci-icon { font-size: 1.5rem; flex-shrink: 0; }
.contact-item h4 { font-size: 1rem; margin-bottom: 2px; }
.contact-item p { color: var(--color-text-light); font-size: 0.95rem; }

.contact-form {
  background: var(--color-bg-alt);
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}
.contact-form h3 { margin-bottom: 20px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; color: var(--color-text); }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  transition: border-color var(--transition);
  background: #fff;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(212,148,43,0.15);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-note { margin-top: 16px; font-size: 0.8rem; color: #999; text-align: center; }

/* ===== Footer ===== */
.site-footer {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  padding: 56px 0 24px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 2fr; gap: 32px; margin-bottom: 40px; }
.footer-grid h4 { color: #fff; margin-bottom: 16px; font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.05em; }
.footer-grid a { display: block; color: #8896a8; font-size: 0.9rem; padding: 4px 0; transition: color var(--transition); }
.footer-grid a:hover { color: var(--color-accent); }
.footer-grid p { color: #8896a8; font-size: 0.9rem; line-height: 1.8; }
.footer-bottom {
  border-top: 1px solid #2a3d52;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: #5a6a7a;
}

/* ===== Brochure Gallery ===== */
.brochure-gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.brochure-item { position: relative; cursor: pointer; overflow: hidden; border-radius: var(--radius); box-shadow: var(--shadow-sm); transition: all var(--transition); }
.brochure-item:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.brochure-item img { width: 100%; display: block; transition: transform 0.4s ease; }
.brochure-item:hover img { transform: scale(1.03); }
.brochure-caption { position: absolute; bottom: 0; left: 0; right: 0; background: linear-gradient(transparent, rgba(0,0,0,0.75)); color: #fff; padding: 16px; font-size: 0.9rem; font-weight: 600; }

/* ===== Lightbox ===== */
.lightbox { display: none; position: fixed; z-index: 200; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.92); align-items: center; justify-content: center; cursor: pointer; }
.lightbox.active { display: flex; }
.lightbox img { max-width: 90vw; max-height: 90vh; object-fit: contain; }
.lightbox-close { position: absolute; top: 20px; right: 30px; color: #fff; font-size: 2rem; cursor: pointer; z-index: 201; }
.lightbox-prev, .lightbox-next { position: absolute; top: 50%; color: #fff; font-size: 2.5rem; cursor: pointer; z-index: 201; transform: translateY(-50%); padding: 16px; user-select: none; }
.lightbox-prev { left: 16px; }
.lightbox-next { right: 16px; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  .section { padding: 56px 0; }
  .hero { padding: 72px 0 56px; }
  .hero h1 { font-size: 2rem; }

  .main-nav { display: none; }
  .mobile-menu-btn { display: block; }

  .card-grid.cols-3, .card-grid.cols-2, .stats-row, .printing-features,
  .equipment-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .certs-row { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }

  .stat-number { font-size: 2.2rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .card-horizontal { flex-direction: column; }
  .site-header .container { gap: 16px; }
}