:root {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F7F8FA;
  --bg-tertiary: #EEF0F4;
  --bg-card: #FFFFFF;
  --bg-dark: #1B2A4A;
  --accent: #2563EB;
  --accent-dark: #1D4ED8;
  --accent-light: #3B82F6;
  --accent-bg: #EFF6FF;
  --accent-border: #BFDBFE;
  --text-primary: #1E293B;
  --text-secondary: #64748B;
  --text-tertiary: #94A3B8;
  --text-white: #FFFFFF;
  --border: #E2E8F0;
  --border-hover: #CBD5E1;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.12);
  --gradient: linear-gradient(135deg, #2563EB, #1E40AF);
  --gradient-hero: linear-gradient(135deg, #1B2A4A 0%, #1E3A5F 50%, #1B2A4A 100%);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --nav-h: 72px;
  --max-w: 1200px;
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

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

a { text-decoration: none; color: inherit; transition: color var(--transition); }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; border: none; outline: none; font-family: var(--font); }
input, textarea, select { font-family: var(--font); outline: none; }

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

.navbar {
  position: fixed; top: 0; left: 0; width: 100%; height: var(--nav-h);
  z-index: 1000; transition: all var(--transition);
  background: rgba(255,255,255,0.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: rgba(255,255,255,0.97);
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.navbar-container {
  display: flex; align-items: center; justify-content: space-between; height: 100%;
}

.logo { display: flex; align-items: center; }
.logo-img { height: 42px; width: auto; }

.nav-menu {
  display: flex; align-items: center; gap: 36px;
}

.nav-link {
  font-size: 0.9rem; font-weight: 500; color: var(--text-secondary);
  position: relative; padding: 4px 0; transition: color var(--transition);
}

.nav-link:hover, .nav-link.active { color: var(--accent); }

.nav-link::after {
  content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
  background: var(--gradient); border-radius: 1px; transition: width var(--transition);
}

.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.hamburger {
  display: none; flex-direction: column; gap: 5px; background: none; padding: 8px;
}

.hamburger span {
  display: block; width: 22px; height: 2px; background: var(--text-primary);
  transition: all var(--transition); border-radius: 1px;
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  justify-content: center; overflow: hidden; background: var(--gradient-hero);
}

.hero #particleCanvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
}

.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(27,42,74,0.3) 0%, rgba(27,42,74,0.6) 100%);
}

.hero-content {
  position: relative; z-index: 2; text-align: center; max-width: 800px; padding: 0 24px;
}

.hero-title {
  font-size: 3.2rem; font-weight: 800; color: var(--text-white);
  line-height: 1.25; margin-bottom: 20px; letter-spacing: 0.02em;
}

.hero-subtitle {
  font-size: 1.2rem; color: rgba(255,255,255,0.75); margin-bottom: 40px; line-height: 1.8;
}

.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 32px; font-size: 0.95rem; font-weight: 600;
  border-radius: var(--radius-md); transition: all var(--transition); letter-spacing: 0.03em;
}

.btn-primary {
  background: var(--gradient); color: var(--text-white);
  box-shadow: 0 4px 16px rgba(37,99,235,0.35);
}

.btn-primary:hover {
  box-shadow: 0 6px 24px rgba(37,99,235,0.5); transform: translateY(-2px);
}

.btn-outline {
  background: transparent; color: var(--text-white);
  border: 1.5px solid rgba(255,255,255,0.4);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.7);
  transform: translateY(-2px);
}

.btn-small { padding: 8px 20px; font-size: 0.85rem; }

.btn-accent {
  background: var(--gradient); color: var(--text-white);
  box-shadow: 0 4px 16px rgba(37,99,235,0.3);
}

.btn-accent:hover {
  box-shadow: 0 6px 24px rgba(37,99,235,0.45); transform: translateY(-2px);
}

.section-title {
  font-size: 2rem; font-weight: 700; margin-bottom: 12px; line-height: 1.3;
  color: var(--text-primary);
}

.section-title.center { text-align: center; }

.center { text-align: center; }

.about {
  padding: 80px 0; background: var(--bg-primary);
}

.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}

.about-text .section-title { margin-bottom: 20px; }

.about-desc {
  font-size: 0.95rem; color: var(--text-secondary); line-height: 1.9;
}

.about-stats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}

.stat-item {
  text-align: center; padding: 28px 16px; background: var(--bg-secondary);
  border-radius: var(--radius-md); border: 1px solid var(--border);
  transition: all var(--transition);
}

.stat-item:hover {
  border-color: var(--accent-border); box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.stat-number {
  font-size: 2.2rem; font-weight: 800; color: var(--accent); display: block;
}

.stat-suffix {
  font-size: 1.2rem; font-weight: 700; color: var(--accent);
}

.stat-label {
  font-size: 0.85rem; color: var(--text-secondary); margin-top: 6px; display: block;
}

.products {
  padding: 80px 0; background: var(--bg-secondary);
}

.products-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}

.product-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border); overflow: hidden;
  transition: all var(--transition); position: relative;
}

.product-card:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-lg);
  border-color: var(--accent-border);
}

.product-image {
  position: relative; padding: 24px 24px 0; display: flex;
  justify-content: center; align-items: center;
}

.product-image-placeholder {
  width: 100%; height: 180px; display: flex; align-items: center;
  justify-content: center; background: var(--bg-tertiary);
  border-radius: var(--radius-md); overflow: hidden;
}

.product-image-placeholder svg { width: 80px; height: 80px; }

.product-tag {
  position: absolute; top: 16px; right: 16px;
  font-size: 0.72rem; font-weight: 600; color: var(--accent);
  padding: 4px 12px; background: var(--accent-bg);
  border: 1px solid var(--accent-border); border-radius: 20px;
}

.product-info { padding: 20px 24px 24px; }

.product-name {
  font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; color: var(--text-primary);
}

.product-model {
  font-size: 0.82rem; color: var(--accent); margin-bottom: 10px; font-weight: 500;
}

.product-desc {
  font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7;
  margin-bottom: 16px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}

.advantages {
  padding: 80px 0; background: var(--bg-primary);
}

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

.advantage-item {
  text-align: center; padding: 36px 20px; background: var(--bg-secondary);
  border-radius: var(--radius-lg); border: 1px solid var(--border);
  transition: all var(--transition);
}

.advantage-item:hover {
  border-color: var(--accent-border); box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.advantage-number {
  font-size: 2.8rem; font-weight: 800; color: var(--accent); display: block;
  margin-bottom: 4px;
}

.advantage-suffix {
  font-size: 1rem; font-weight: 600; color: var(--accent);
}

.advantage-label {
  font-size: 0.9rem; color: var(--text-secondary); margin-top: 8px; display: block;
}

.follow-me {
  padding: 80px 0; background: var(--bg-secondary); text-align: center;
}

.social-links {
  display: flex; justify-content: center; gap: 20px; margin-top: 32px;
}

.social-link { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
  border-radius: 50%; background: var(--bg-card); border: 1px solid var(--border);
  transition: all var(--transition);
}

.social-link:hover {
  border-color: var(--accent); background: var(--accent-bg);
  transform: translateY(-4px); box-shadow: var(--shadow-md);
}

.social-link svg, .social-link img { width: 28px; height: 28px; }

.footer {
  background: var(--bg-dark); color: rgba(255,255,255,0.8);
  padding: 60px 0 24px;
}

.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px;
  margin-bottom: 40px;
}

.footer-logo { margin-bottom: 16px; }
.footer-logo .logo-img { height: 36px; }

.footer-desc {
  font-size: 0.88rem; color: rgba(255,255,255,0.55); line-height: 1.8;
}

.footer-title {
  font-size: 0.95rem; font-weight: 600; color: var(--text-white); margin-bottom: 20px;
}

.footer-links li { margin-bottom: 10px; }

.footer-links a {
  font-size: 0.88rem; color: rgba(255,255,255,0.55);
  transition: color var(--transition), padding-left var(--transition);
}

.footer-links a:hover { color: var(--accent-light); padding-left: 6px; }

.footer-contact li {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 12px; font-size: 0.88rem; color: rgba(255,255,255,0.55);
}

.footer-contact svg, .footer-contact img { flex-shrink: 0; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center;
}

.footer-bottom p { font-size: 0.82rem; color: rgba(255,255,255,0.4); }

.page-banner {
  padding: 120px 0 60px; text-align: center; background: var(--bg-secondary);
  border-bottom: 1px solid var(--border); margin-bottom: 48px;
}

.page-banner h1 {
  font-size: 2.2rem; font-weight: 700; margin-bottom: 12px; color: var(--text-primary);
}

.page-banner p {
  font-size: 1rem; color: var(--text-secondary); max-width: 500px; margin: 0 auto;
}

.product-list-page { padding-bottom: 80px; }

.product-list-filters {
  display: flex; justify-content: center; gap: 12px; margin-bottom: 40px; flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 24px; font-size: 0.88rem; color: var(--text-secondary);
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-md); transition: all var(--transition); cursor: pointer;
}

.filter-btn:hover, .filter-btn.active {
  color: var(--accent); border-color: var(--accent); background: var(--accent-bg);
}

.product-detail-page { padding-bottom: 80px; }

.breadcrumb {
  font-size: 0.85rem; color: var(--text-tertiary); margin-bottom: 32px;
}

.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 8px; }

.detail-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-bottom: 48px;
}

.detail-image {
  background: var(--bg-secondary); border-radius: var(--radius-lg);
  border: 1px solid var(--border); overflow: hidden;
  display: flex; align-items: center; justify-content: center; min-height: 360px;
}

.detail-image img { width: 100%; }

.detail-info h1 {
  font-size: 1.8rem; font-weight: 700; margin-bottom: 12px;
}

.detail-model {
  font-size: 0.9rem; color: var(--accent); font-weight: 500; margin-bottom: 16px;
}

.detail-desc {
  font-size: 0.95rem; color: var(--text-secondary); line-height: 1.9; margin-bottom: 24px;
}

.detail-features { margin-bottom: 24px; }

.feature-tag {
  display: inline-block; font-size: 0.82rem; color: var(--accent);
  padding: 6px 14px; border-left: 3px solid var(--accent);
  background: var(--accent-bg); margin: 0 8px 8px 0;
}

.specs-section { margin-top: 48px; }

.specs-section h3 {
  font-size: 1.3rem; font-weight: 700; margin-bottom: 20px;
  padding-bottom: 12px; border-bottom: 2px solid var(--border);
}

.specs-table { width: 100%; border-collapse: collapse; }

.specs-table th, .specs-table td {
  padding: 14px 20px; text-align: left; font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}

.specs-table th {
  color: var(--text-secondary); font-weight: 500; width: 30%;
  background: var(--bg-secondary);
}

.specs-table td { color: var(--text-primary); }

.specs-table tr:hover td { background: var(--accent-bg); }

.docs-section { margin-top: 48px; }

.docs-section h3 {
  font-size: 1.3rem; font-weight: 700; margin-bottom: 20px;
  padding-bottom: 12px; border-bottom: 2px solid var(--border);
}

.doc-item {
  display: flex; align-items: center; gap: 16px;
  padding: 16px 20px; background: var(--bg-secondary);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  margin-bottom: 12px; transition: all var(--transition);
}

.doc-item:hover { border-color: var(--accent-border); box-shadow: var(--shadow-sm); }

.doc-icon {
  width: 40px; height: 40px; background: var(--accent-bg);
  border-radius: var(--radius-sm); display: flex; align-items: center;
  justify-content: center; color: var(--accent); flex-shrink: 0;
}

.doc-name { font-size: 0.9rem; font-weight: 500; }
.doc-size { font-size: 0.8rem; color: var(--text-tertiary); }

.related-section { margin-top: 64px; }

.related-section h3 {
  font-size: 1.3rem; font-weight: 700; margin-bottom: 24px;
}

.about-page { padding-bottom: 80px; }

.about-intro {
  padding: 48px 0; margin-bottom: 0;
}

.about-intro h2 {
  font-size: 1.6rem; font-weight: 700; margin-bottom: 16px;
}

.about-intro p {
  font-size: 0.95rem; color: var(--text-secondary); line-height: 1.9;
}

.timeline-section {
  padding: 64px 0;
}

.timeline {
  position: relative; padding-left: 32px; margin-bottom: 0;
}

.timeline::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px; background: var(--gradient);
}

.timeline-item {
  position: relative; margin-bottom: 32px; padding-left: 24px;
}

.timeline-item:last-child { margin-bottom: 0; }

.timeline-dot {
  position: absolute; left: -37px; top: 6px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--bg-primary);
  box-shadow: 0 0 0 3px var(--accent-bg);
}

.timeline-content h4 {
  font-size: 1rem; font-weight: 700; color: var(--accent); margin-bottom: 4px;
}

.timeline-content p {
  font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7;
}

.values-section {
  padding: 64px 0;
}

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

.value-card {
  padding: 32px 24px; background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border); text-align: center; transition: all var(--transition);
}

.value-card:hover {
  border-color: var(--accent-border); box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.value-icon {
  width: 56px; height: 56px; margin: 0 auto 16px; background: var(--accent-bg);
  border-radius: var(--radius-md); display: flex; align-items: center;
  justify-content: center;
}

.value-icon img { width: 28px; height: 28px; }

.value-card h4 {
  font-size: 1.05rem; font-weight: 700; margin-bottom: 8px;
}

.value-card p {
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7;
}

.cta-section {
  padding: 64px 24px; background: var(--gradient-hero); text-align: center;
  border-radius: var(--radius-xl); margin: 0 24px 0;
}

.cta-section h2 {
  font-size: 1.8rem; font-weight: 700; color: var(--text-white); margin-bottom: 24px;
}

.cta-section p {
  font-size: 1rem; color: rgba(255,255,255,0.7); margin-bottom: 32px;
}

.cta-btn {
  display: inline-block; padding: 14px 40px; font-size: 1rem; font-weight: 600;
  color: var(--text-white); background: var(--accent); border-radius: var(--radius-md);
  transition: all var(--transition); text-decoration: none;
}

.cta-btn:hover {
  background: var(--accent-dark); box-shadow: 0 6px 24px rgba(37,99,235,0.5);
  transform: translateY(-2px);
}

.contact-page { padding-bottom: 80px; }

.contact-cards-section {
  padding: 0 0 48px;
}

.contact-cards {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 48px;
}

.contact-card {
  padding: 32px; background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border); text-align: center; transition: all var(--transition);
}

.contact-card:hover {
  border-color: var(--accent-border); box-shadow: var(--shadow-md);
}

.contact-card-icon {
  width: 52px; height: 52px; margin: 0 auto 16px; background: var(--accent-bg);
  border-radius: var(--radius-md); display: flex; align-items: center;
  justify-content: center;
}

.contact-card-icon img { width: 24px; height: 24px; }

.contact-card h4 {
  font-size: 0.95rem; font-weight: 600; margin-bottom: 8px;
}

.contact-card p {
  font-size: 0.88rem; color: var(--text-secondary);
}

.contact-section {
  padding-bottom: 80px;
}

.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
}

.contact-form-wrap {
  background: var(--bg-card); border-radius: var(--radius-lg);
  padding: 36px; border: 1px solid var(--border);
}

.contact-form-wrap h3 {
  font-size: 1.2rem; font-weight: 700; margin-bottom: 24px;
}

.form-group { margin-bottom: 20px; }

.form-group label {
  display: block; font-size: 0.88rem; font-weight: 500;
  color: var(--text-secondary); margin-bottom: 8px;
}

.form-input {
  width: 100%; padding: 12px 16px; font-size: 0.9rem;
  color: var(--text-primary); background: var(--bg-secondary);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus {
  border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-bg);
}

.form-input::placeholder { color: var(--text-tertiary); }

textarea.form-input { min-height: 120px; resize: vertical; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.form-submit {
  width: 100%; padding: 14px; font-size: 1rem; font-weight: 600;
  color: var(--text-white); background: var(--gradient);
  border-radius: var(--radius-md); transition: all var(--transition);
}

.form-submit:hover {
  box-shadow: 0 6px 24px rgba(37,99,235,0.4); transform: translateY(-2px);
}

.contact-info-side {
  background: var(--bg-card); border-radius: var(--radius-lg);
  padding: 36px; border: 1px solid var(--border);
}

.contact-info-side h3 {
  font-size: 1.2rem; font-weight: 700; margin-bottom: 24px;
}

.contact-details {
  margin-bottom: 24px;
}

.detail-item {
  display: flex; align-items: center; gap: 12px; margin-bottom: 16px;
  font-size: 0.88rem; color: var(--text-secondary);
}

.detail-item img {
  flex-shrink: 0; width: 20px; height: 20px;
}

.detail-item span {
  line-height: 1.5;
}

.required {
  color: #EF4444; font-size: 0.85rem;
}

.contact-info-item {
  display: flex; align-items: flex-start; gap: 16px; margin-bottom: 24px;
}

.contact-info-icon {
  width: 44px; height: 44px; background: var(--accent-bg);
  border-radius: var(--radius-md); display: flex; align-items: center;
  justify-content: center; flex-shrink: 0;
}

.contact-info-icon img { width: 20px; height: 20px; }

.contact-info-text h4 {
  font-size: 0.92rem; font-weight: 600; margin-bottom: 4px;
}

.contact-info-text p {
  font-size: 0.88rem; color: var(--text-secondary);
}

.map-placeholder {
  margin-top: 32px; height: 200px; background: var(--bg-secondary);
  border-radius: var(--radius-lg); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-tertiary); font-size: 0.9rem;
}

.map-inner {
  text-align: center;
}

.map-inner img {
  width: 48px; height: 48px; margin: 0 auto 12px; display: block;
}

.map-inner p {
  font-size: 0.85rem; color: var(--text-tertiary);
}

.animate-on-scroll {
  opacity: 0; transform: translateY(24px); transition: all 0.6s ease;
}

.animate-on-scroll.animated {
  opacity: 1; transform: translateY(0);
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

.hero-scroll {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  z-index: 2; animation: bounce 2s infinite;
}

.hero-scroll span {
  display: block; width: 24px; height: 24px;
  border-right: 2px solid rgba(255,255,255,0.5);
  border-bottom: 2px solid rgba(255,255,255,0.5);
  transform: rotate(45deg);
}