/* ==========================================================================
   Kunyue Machinery - Enterprise B2B Design Tokens & Modern Stylesheet
   Focus: Mining Slurry Pumps, Gravel Pumps, Dredging Equipment & Wear Parts
   ========================================================================== */

:root {
  /* Brand Palette - Industrial Technical Mining */
  --color-primary: #0F2B48;        /* Deep Industrial Navy */
  --color-primary-light: #1A3E63;
  --color-primary-dark: #0A1C30;
  --color-accent: #E05315;         /* Mining Safety Amber / Orange */
  --color-accent-hover: #C6430C;
  --color-accent-soft: #FDF1EA;
  --color-accent-dark: #983208;
  
  --color-success: #1E7E34;
  --color-warning: #D9822B;
  --color-info: #0D6EFD;
  
  /* Neutral Surfaces & Text */
  --color-bg-body: #F8FAFC;
  --color-bg-surface: #FFFFFF;
  --color-bg-subtle: #F1F5F9;
  --color-bg-dark: #0B1727;
  --color-bg-dark-surface: #132238;
  
  --color-text-main: #1E293B;
  --color-text-muted: #64748B;
  --color-text-light: #94A3B8;
  --color-text-inverse: #FFFFFF;
  
  --color-border: #E2E8F0;
  --color-border-dark: #2A3C53;
  
  /* Shadows & Radius */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-xl: 16px;
  
  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-body);
  color: var(--color-text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.container-narrow {
  max-width: 960px;
}

/* Top Notification / Engineering Header Bar */
.top-bar {
  background: var(--color-primary-dark);
  color: #CBD5E1;
  font-size: 0.8125rem;
  padding: 6px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.top-bar-left, .top-bar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}
.top-bar a:hover {
  color: #FFFFFF;
}
.badge-highlight {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(224, 83, 21, 0.2);
  color: #FFA67E;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid rgba(224, 83, 21, 0.3);
}

/* Main Navigation */
.main-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #FFFFFF;
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--color-border);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -1px;
  border-left: 4px solid var(--color-accent);
}
.logo-text h1 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
  letter-spacing: -0.5px;
}
.logo-text span {
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--color-text-muted);
  letter-spacing: 1px;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}
.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-main);
  padding: 8px 4px;
  position: relative;
}
.nav-link:hover, .nav-link.active {
  color: var(--color-accent);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -18px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Primary Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-accent);
  color: #FFFFFF;
  box-shadow: 0 2px 4px rgba(224, 83, 21, 0.25);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 8px rgba(224, 83, 21, 0.35);
  transform: translateY(-1px);
}
.btn-secondary {
  background: #FFFFFF;
  color: var(--color-primary);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  background: var(--color-bg-subtle);
  border-color: #CBD5E1;
}
.btn-navy {
  background: var(--color-primary);
  color: #FFFFFF;
}
.btn-navy:hover {
  background: var(--color-primary-light);
}
.btn-sm {
  font-size: 0.8125rem;
  padding: 6px 14px;
}
.btn-lg {
  font-size: 1.0625rem;
  padding: 14px 28px;
}

/* Hero Section */
.hero-section {
  position: relative;
  background: linear-gradient(135deg, #0A1C30 0%, #0F2B48 100%);
  color: #FFFFFF;
  padding: 70px 0 90px;
  overflow: hidden;
  border-bottom: 4px solid var(--color-accent);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(224, 83, 21, 0.15);
  border: 1px solid rgba(224, 83, 21, 0.4);
  color: #FFA67E;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-title {
  font-size: 2.75rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 20px;
}
.hero-title span {
  color: #FFA67E;
}
.hero-desc {
  font-size: 1.125rem;
  line-height: 1.6;
  color: #CBD5E1;
  margin-bottom: 30px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 35px;
}
.hero-proofs {
  display: flex;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}
.proof-item {
  display: flex;
  flex-direction: column;
}
.proof-item strong {
  font-size: 1.5rem;
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1;
}
.proof-item span {
  font-size: 0.75rem;
  color: #94A3B8;
  text-transform: uppercase;
  margin-top: 4px;
}

/* Hero Calculator Card */
.hero-card {
  background: rgba(19, 34, 56, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-xl);
}
.hero-card-header {
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 14px;
}
.hero-card-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-card-header p {
  font-size: 0.8125rem;
  color: #94A3B8;
  margin-top: 4px;
}

/* Form Styles */
.form-group {
  margin-bottom: 16px;
}
.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #CBD5E1;
  margin-bottom: 6px;
}
.form-control {
  width: 100%;
  padding: 10px 12px;
  font-size: 0.9375rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(11, 23, 39, 0.6);
  color: #FFFFFF;
  transition: border-color 0.15s ease;
}
.form-control:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(224, 83, 21, 0.2);
}
.form-control-light {
  background: #FFFFFF;
  color: var(--color-text-main);
  border-color: var(--color-border);
}
.form-control-light:focus {
  border-color: var(--color-accent);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* Sections General */
.section {
  padding: 80px 0;
}
.section-subtle {
  background-color: #F1F5F9;
}
.section-dark {
  background: var(--color-bg-dark);
  color: #FFFFFF;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}
.section-tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-accent);
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.section-title {
  font-size: 2.125rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.25;
  margin-bottom: 12px;
}
.section-dark .section-title {
  color: #FFFFFF;
}
.section-desc {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
}
.section-dark .section-desc {
  color: #94A3B8;
}

/* Product Cards Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.product-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #CBD5E1;
}
.product-img-wrap {
  position: relative;
  background: #F8FAFC;
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  border-bottom: 1px solid var(--color-border);
}
.product-img-wrap img {
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}
.product-card:hover .product-img-wrap img {
  transform: scale(1.05);
}
.product-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--color-primary);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}
.product-content {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.product-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.product-meta {
  font-size: 0.8125rem;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 12px;
}
.product-specs-list {
  list-style: none;
  font-size: 0.8125rem;
  margin-bottom: 20px;
  flex: 1;
}
.product-specs-list li {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px dashed var(--color-border);
}
.product-specs-list li span:first-child {
  color: var(--color-text-muted);
}
.product-specs-list li span:last-child {
  font-weight: 600;
  color: var(--color-text-main);
  font-family: var(--font-mono);
}
.product-footer {
  display: flex;
  gap: 10px;
  margin-top: auto;
}

/* Mining Applications Feature Row */
.app-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  border-left: 5px solid var(--color-accent);
}
.app-card h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.app-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 14px;
}
.app-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.app-tag {
  font-size: 0.75rem;
  background: var(--color-bg-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  color: var(--color-text-main);
  font-weight: 500;
}

/* Wear Parts & Interchangeability Table */
.parts-table-wrap {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}
.spec-table th {
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 14px 16px;
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.spec-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-main);
}
.spec-table tr:last-child td {
  border-bottom: none;
}
.spec-table tr:hover td {
  background: #F8FAFC;
}
.mono-cell {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-primary);
}

/* Metric / Capability Counters */
.metrics-strip {
  background: var(--color-primary-dark);
  color: #FFFFFF;
  padding: 40px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.metric-box strong {
  display: block;
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 6px;
}
.metric-box span {
  font-size: 0.875rem;
  color: #CBD5E1;
  text-transform: uppercase;
  font-weight: 500;
}

/* FAQ Accordion */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
}
.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  padding: 18px 24px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}
.faq-question:hover {
  background: #F8FAFC;
}
.faq-answer {
  padding: 0 24px 20px;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Footer Matrix */
.site-footer {
  background: var(--color-bg-dark);
  color: #CBD5E1;
  padding: 70px 0 20px;
  font-size: 0.875rem;
  border-top: 5px solid var(--color-accent);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.2fr 1.2fr 1.4fr;
  gap: 36px;
  margin-bottom: 50px;
}
.footer-col h5 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: #FFFFFF;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 20px;
  border-left: 3px solid var(--color-accent);
  padding-left: 8px;
}
.footer-links {
  list-style: none;
}
.footer-links li {
  margin-bottom: 10px;
}
.footer-links a {
  color: #94A3B8;
}
.footer-links a:hover {
  color: #FFFFFF;
  text-decoration: underline;
}
.footer-disclaimer {
  background: rgba(0, 0, 0, 0.25);
  padding: 20px;
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  line-height: 1.5;
  color: #94A3B8;
  margin-bottom: 30px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  color: #64748B;
  font-size: 0.8125rem;
}

/* Floating WhatsApp / RFQ Button */
.float-rfq {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 99;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.float-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #25D366;
  color: #FFFFFF;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.875rem;
  box-shadow: 0 4px 14px rgba(37, 211, 102, 0.4);
  transition: transform 0.2s ease;
}
.float-btn:hover {
  transform: translateY(-3px);
  color: #FFFFFF;
}
.float-btn-rfq {
  background: var(--color-accent);
  box-shadow: 0 4px 14px rgba(224, 83, 21, 0.4);
}

/* Mobile & Responsive */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .nav-links {
    display: none;
  }
  .metrics-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 2rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
}