/* ============================================
   LIZHONG - Steel Prop Manufacturer
   Industrial Design System
   ============================================ */

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

:root {
  --color-dark: #0A1628;
  --color-darker: #060F1C;
  --color-primary: #1B3A5C;
  --color-primary-light: #2C5680;
  --color-accent: #E53E3E;
  --color-accent-dark: #C53030;
  --color-steel: #4A5568;
  --color-steel-light: #718096;
  --color-light: #F7FAFC;
  --color-gray: #E2E8F0;
  --color-gray-dark: #CBD5E0;
  --color-white: #FFFFFF;
  --color-success: #38A169;
  --font-display: 'Oswald', sans-serif;
  --font-body: 'Manrope', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --container: 1200px;
  --radius: 4px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.2);
}

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

body {
  font-family: var(--font-body);
  color: var(--color-steel);
  background: var(--color-light);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-dark);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

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

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

ul { list-style: none; }

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

.section { padding: 100px 0; }
.section-sm { padding: 60px 0; }

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header .section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 16px;
  position: relative;
  padding-left: 32px;
}

.section-header .section-tag::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}

.section-header h2 {
  font-size: 2.8rem;
  margin-bottom: 16px;
}

.section-header p {
  max-width: 640px;
  margin: 0 auto;
  font-size: 1.05rem;
  color: var(--color-steel-light);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(229,62,62,0.35);
}

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

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

.btn-dark {
  background: var(--color-dark);
  color: var(--color-white);
  border-color: var(--color-dark);
}

.btn-dark:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: all var(--transition);
}

.nav.scrolled {
  background: rgba(10, 22, 40, 0.98);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.nav-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-logo span { color: var(--color-accent); }

.nav-logo .logo-mark {
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-white);
}

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

.nav-menu a {
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  padding: 4px 0;
}

.nav-menu a:hover, .nav-menu a.active {
  color: var(--color-white);
}

.nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
}

.nav-cta {
  padding: 10px 24px !important;
  background: var(--color-accent);
  color: var(--color-white) !important;
  border-radius: var(--radius);
  font-size: 0.85rem !important;
}

.nav-cta:hover { background: var(--color-accent-dark); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: all var(--transition);
  border-radius: 2px;
}

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

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--color-dark);
  overflow: hidden;
  padding-top: 72px;
}

.hero-bg {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background:
    linear-gradient(135deg, rgba(10,22,40,0.92) 0%, rgba(27,58,92,0.85) 100%),
    url('https://images.unsplash.com/photo-1503387762-592deb58ef4e?w=1600&q=80') center/cover no-repeat;
}

.hero-grid {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
}

.hero-inner {
  max-width: 760px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: rgba(255,255,255,0.6);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: 24px;
  padding: 8px 16px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 50px;
  background: rgba(255,255,255,0.03);
}

.hero-tag .dot {
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.2); }
}

.hero h1 {
  font-size: 4rem;
  color: var(--color-white);
  margin-bottom: 24px;
  line-height: 1.1;
  font-weight: 700;
}

.hero h1 .accent { color: var(--color-accent); }

.hero p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 40px;
  max-width: 580px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.hero-stat .number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
}

.hero-stat .number .unit { color: var(--color-accent); font-size: 1.5rem; }

.hero-stat .label {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 8px;
}

/* ---------- Trust Bar ---------- */
.trust-bar {
  background: var(--color-darker);
  padding: 32px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.trust-bar .container {
  display: flex;
  justify-content: space-around;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(255,255,255,0.6);
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.trust-item svg {
  width: 24px;
  height: 24px;
  fill: var(--color-accent);
  flex-shrink: 0;
}

/* ---------- Products Section ---------- */
.products-section { background: var(--color-light); }

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

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

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.product-card .product-image {
  width: 100%;
  height: 260px;
  background: var(--color-dark);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-card .product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-card .product-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--color-accent);
  color: var(--color-white);
  padding: 4px 12px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: 2px;
  z-index: 2;
}

.product-card .product-body {
  padding: 28px;
}

.product-card .product-body h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: var(--color-dark);
}

.product-card .product-body p {
  font-size: 0.9rem;
  color: var(--color-steel-light);
  margin-bottom: 20px;
  line-height: 1.6;
}

.product-specs {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-gray);
}

.product-specs .spec-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
}

.product-specs .spec-label {
  color: var(--color-steel-light);
  font-weight: 500;
}

.product-specs .spec-value {
  color: var(--color-dark);
  font-weight: 600;
  font-family: var(--font-mono);
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.product-link:hover { gap: 12px; }

/* ---------- Why Choose Us ---------- */
.why-section {
  background: var(--color-dark);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.why-section .section-header h2 { color: var(--color-white); }
.why-section .section-header p { color: rgba(255,255,255,0.6); }

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.why-card {
  padding: 36px 32px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  transition: all var(--transition);
  position: relative;
}

.why-card:hover {
  background: rgba(255,255,255,0.06);
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.why-card .why-number {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: rgba(255,255,255,0.1);
  line-height: 1;
  margin-bottom: 20px;
}

.why-card .why-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(229,62,62,0.15);
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.why-card .why-icon svg {
  width: 24px;
  height: 24px;
  fill: var(--color-accent);
}

.why-card h3 {
  color: var(--color-white);
  font-size: 1.15rem;
  margin-bottom: 12px;
}

.why-card p {
  color: rgba(255,255,255,0.55);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- Factory Section ---------- */
.factory-section { background: var(--color-light); }

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

.factory-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.factory-img {
  height: 200px;
  background: var(--color-gray);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}

.factory-img:nth-child(1) { grid-column: 1 / -1; height: 240px; }
.factory-img:nth-child(4) { grid-column: 1 / -1; height: 180px; }

.factory-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.factory-img:hover img { transform: scale(1.05); }

.factory-img .img-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 16px;
  background: linear-gradient(transparent, rgba(10,22,40,0.85));
  color: var(--color-white);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.factory-content h2 {
  font-size: 2.4rem;
  margin-bottom: 20px;
}

.factory-content .factory-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 16px;
  display: block;
}

.factory-content p {
  margin-bottom: 24px;
  font-size: 1rem;
  line-height: 1.8;
}

.factory-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 32px 0;
}

.factory-feature {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.factory-feature .check {
  width: 20px;
  height: 20px;
  background: var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.factory-feature .check::after {
  content: '';
  width: 6px;
  height: 10px;
  border: solid var(--color-white);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-bottom: 2px;
}

.factory-feature span {
  font-size: 0.9rem;
  color: var(--color-steel);
  font-weight: 500;
}

/* ---------- Stats Bar ---------- */
.stats-bar {
  background: var(--color-primary);
  padding: 80px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item .stat-number {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
}

.stat-item .stat-number .unit { color: var(--color-accent); }

.stat-item .stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 12px;
}

/* ---------- CTA Section ---------- */
.cta-section {
  background: var(--color-dark);
  padding: 100px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 40px 40px;
}

.cta-section .container { position: relative; z-index: 2; }

.cta-section h2 {
  color: var(--color-white);
  font-size: 3rem;
  margin-bottom: 20px;
}

.cta-section p {
  color: rgba(255,255,255,0.6);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto 40px;
}

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

/* ---------- Footer ---------- */
.footer {
  background: var(--color-darker);
  color: rgba(255,255,255,0.6);
  padding: 80px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .nav-logo { margin-bottom: 20px; }

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--color-accent);
  transform: translateY(-2px);
}

.footer-social svg { width: 18px; height: 18px; fill: rgba(255,255,255,0.7); }
.footer-social a:hover svg { fill: var(--color-white); }

.footer-col h4 {
  color: var(--color-white);
  font-size: 0.95rem;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer-col ul li { margin-bottom: 12px; }

.footer-col ul li a {
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-col ul li a:hover { color: var(--color-accent); }

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.5);
}

.footer-contact svg {
  width: 16px;
  height: 16px;
  fill: var(--color-accent);
  flex-shrink: 0;
  margin-top: 3px;
}

.footer-bottom {
  padding: 28px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}

/* ---------- WhatsApp Float ---------- */
.whatsapp-float {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 56px;
  height: 56px;
  background: #25D366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(37,211,102,0.4);
  z-index: 999;
  transition: all var(--transition);
  animation: bounce 2s infinite;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 30px rgba(37,211,102,0.5);
}

.whatsapp-float svg { width: 28px; height: 28px; fill: var(--color-white); }

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

/* ---------- Page Header (inner pages) ---------- */
.page-header {
  background: var(--color-dark);
  padding: 140px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 50px 50px;
}

.page-header .container { position: relative; z-index: 2; }

.page-header h1 {
  color: var(--color-white);
  font-size: 3.2rem;
  margin-bottom: 16px;
}

.page-header p {
  color: rgba(255,255,255,0.6);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 24px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}

.breadcrumb a { color: rgba(255,255,255,0.6); }
.breadcrumb a:hover { color: var(--color-accent); }

/* ---------- Products Page ---------- */
.product-detail {
  background: var(--color-light);
}

.product-detail-block {
  background: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 40px;
}

.product-detail-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.product-detail-image {
  height: 400px;
  background: var(--color-dark);
  position: relative;
  overflow: hidden;
}

.product-detail-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-detail-info {
  padding: 40px;
}

.product-detail-info .product-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
  display: block;
}

.product-detail-info h2 {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.product-detail-info .product-desc {
  font-size: 0.95rem;
  color: var(--color-steel-light);
  margin-bottom: 24px;
  line-height: 1.8;
}

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

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

.spec-table th {
  background: var(--color-light);
  color: var(--color-steel);
  font-weight: 600;
  font-family: var(--font-body);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  width: 40%;
}

.spec-table td {
  color: var(--color-dark);
  font-weight: 500;
  font-family: var(--font-mono);
}

.spec-table tr:last-child th,
.spec-table tr:last-child td { border-bottom: none; }

/* ---------- Applications ---------- */
.applications-section { background: var(--color-white); }

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

.app-card {
  text-align: center;
  padding: 32px 20px;
  border: 1px solid var(--color-gray);
  border-radius: var(--radius);
  transition: all var(--transition);
}

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

.app-card .app-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: rgba(27,58,92,0.08);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.app-card:hover .app-icon { background: rgba(229,62,62,0.1); }

.app-card .app-icon svg { width: 28px; height: 28px; fill: var(--color-primary); }
.app-card:hover .app-icon svg { fill: var(--color-accent); }

.app-card h4 { font-size: 1rem; margin-bottom: 8px; }
.app-card p { font-size: 0.85rem; color: var(--color-steel-light); }

/* ---------- About Page ---------- */
.about-intro {
  background: var(--color-light);
}

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

.about-image {
  height: 480px;
  background: var(--color-dark);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}

.about-image img { width: 100%; height: 100%; object-fit: cover; }

.about-content .about-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 16px;
  display: block;
}

.about-content h2 { font-size: 2.4rem; margin-bottom: 24px; }

.about-content p {
  margin-bottom: 20px;
  font-size: 1rem;
  line-height: 1.8;
}

/* ---------- Timeline ---------- */
.timeline-section { background: var(--color-white); }

.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-gray);
  transform: translateX(-50%);
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr 60px 1fr;
  gap: 0;
  margin-bottom: 40px;
  align-items: center;
}

.timeline-item .timeline-content {
  padding: 24px;
  background: var(--color-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius);
}

.timeline-item:nth-child(odd) .timeline-content { grid-column: 1; }
.timeline-item:nth-child(even) .timeline-content { grid-column: 3; }

.timeline-item .timeline-dot {
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border: 4px solid var(--color-light);
  border-radius: 50%;
  margin: 0 auto;
  position: relative;
  z-index: 2;
  grid-column: 2;
}

.timeline-content .year {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.timeline-content h4 { font-size: 1rem; margin-bottom: 8px; }
.timeline-content p { font-size: 0.85rem; color: var(--color-steel-light); margin: 0; }

/* ---------- Quality Control ---------- */
.quality-section { background: var(--color-light); }

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

.quality-step {
  text-align: center;
  padding: 32px 20px;
  position: relative;
}

.quality-step .step-number {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  background: var(--color-primary);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  margin: 0 auto 20px;
}

.quality-step h4 { font-size: 1rem; margin-bottom: 10px; }
.quality-step p { font-size: 0.85rem; color: var(--color-steel-light); }

/* ---------- Contact Page ---------- */
.contact-section { background: var(--color-light); }

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 48px;
}

.contact-info {
  background: var(--color-dark);
  padding: 48px;
  border-radius: var(--radius);
  color: var(--color-white);
}

.contact-info h3 {
  color: var(--color-white);
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.contact-info > p {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  margin-bottom: 32px;
  line-height: 1.8;
}

.contact-info-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.contact-info-list li:last-child { border-bottom: none; }

.contact-info-list .icon {
  width: 40px;
  height: 40px;
  background: rgba(229,62,62,0.15);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-info-list .icon svg { width: 20px; height: 20px; fill: var(--color-accent); }

.contact-info-list .text { flex: 1; }

.contact-info-list .text .label {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.4);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.contact-info-list .text .value {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.9);
  font-weight: 500;
}

.contact-form-wrap {
  background: var(--color-white);
  padding: 48px;
  border: 1px solid var(--color-gray);
  border-radius: var(--radius);
}

.contact-form-wrap h3 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.contact-form-wrap > p {
  font-size: 0.9rem;
  color: var(--color-steel-light);
  margin-bottom: 32px;
}

.form-group { margin-bottom: 24px; }

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

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group label .required { color: var(--color-accent); }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-gray-dark);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-dark);
  background: var(--color-light);
  transition: all var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  background: var(--color-white);
  box-shadow: 0 0 0 3px rgba(27,58,92,0.08);
}

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

/* ---------- FAQ ---------- */
.faq-section { background: var(--color-white); }

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-gray);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item.active { border-color: var(--color-primary); }

.faq-question {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-dark);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: var(--color-light);
  transition: all var(--transition);
}

.faq-item.active .faq-question { background: var(--color-primary); color: var(--color-white); }

.faq-question .faq-toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq-item.active .faq-toggle { transform: rotate(45deg); }

.faq-toggle::before {
  content: '+';
  font-size: 1.4rem;
  font-weight: 300;
  line-height: 1;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 20px 24px;
}

.faq-answer p {
  font-size: 0.9rem;
  color: var(--color-steel);
  line-height: 1.8;
}

/* ---------- Animation Classes ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero h1 { font-size: 3rem; }
  .products-grid, .why-grid { grid-template-columns: repeat(2, 1fr); }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .quality-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .factory-layout, .about-layout { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section-header h2 { font-size: 2rem; }
  .section-header { margin-bottom: 40px; }

  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-dark);
    flex-direction: column;
    padding: 24px;
    gap: 0;
    transform: translateY(-200%);
    transition: transform var(--transition);
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }

  .nav-menu.active { transform: translateY(0); }

  .nav-menu a {
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }

  .nav-menu a.active::after { display: none; }

  .nav-toggle { display: flex; }

  .hero { min-height: auto; padding: 120px 0 80px; }
  .hero h1 { font-size: 2.4rem; }
  .hero p { font-size: 1rem; }
  .hero-stats { flex-wrap: wrap; gap: 32px; }
  .hero-stat .number { font-size: 2rem; }

  .products-grid, .why-grid, .app-grid, .quality-grid, .stats-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid { gap: 32px; }

  .factory-features { grid-template-columns: 1fr; }

  .product-detail-header { grid-template-columns: 1fr; }
  .product-detail-image { height: 280px; }
  .product-detail-info { padding: 24px; }

  .form-row { grid-template-columns: 1fr; }

  .contact-layout { grid-template-columns: 1fr; }
  .contact-info, .contact-form-wrap { padding: 32px 24px; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }

  .cta-section h2 { font-size: 2rem; }
  .page-header h1 { font-size: 2.2rem; }
  .page-header { padding: 120px 0 60px; }

  .trust-bar .container { flex-direction: column; gap: 16px; }

  .whatsapp-float { bottom: 20px; right: 20px; width: 50px; height: 50px; }
  .whatsapp-float svg { width: 24px; height: 24px; }

  .timeline::before { left: 20px; }
  .timeline-item { grid-template-columns: 40px 1fr; gap: 16px; }
  .timeline-item .timeline-content { grid-column: 2 !important; }
  .timeline-item .timeline-dot { grid-column: 1; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .section-header h2 { font-size: 1.6rem; }
  .container { padding: 0 16px; }
  .stat-item .stat-number { font-size: 2.5rem; }
}