/* ===== Baotan Graphite Design System ===== */
:root {
  /* Colors */
  --primary: #0A66C2;
  --primary-dark: #084d94;
  --primary-light: #e8f2fb;
  --dark: #1A1D23;
  --graphite: #4A5568;
  --gray-600: #718096;
  --gray-400: #a0aec0;
  --gray-200: #e2e8f0;
  --light: #F7F8FA;
  --white: #FFFFFF;
  --accent: #00B894;
  --accent-dark: #00a07a;
  --industrial: #E17055;
  --warning: #f0ad4e;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;

  /* Spacing (8px grid) */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --space-2xl: 7.5rem;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body {
  font-family: var(--font-sans);
  font-size: 16px; line-height: 1.7; color: var(--graphite);
  background: var(--white); -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
ul { list-style: none; }
h1, h2, h3, h4, h5 { color: var(--dark); line-height: 1.3; }
h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); font-weight: 600; }
h3 { font-size: clamp(1.1rem, 2vw, 1.5rem); font-weight: 600; }

/* ===== Utility ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md); }
.section { padding: var(--space-xl) 0; }
.section-label { display: inline-block; font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.12em; color: var(--primary); margin-bottom: var(--space-xs); }
.section-title { margin-bottom: var(--space-sm); }
.section-subtitle { font-size: 1.1rem; color: var(--gray-600); max-width: 600px; margin-bottom: var(--space-lg); }
.text-center { text-align: center; }
.text-center .section-subtitle { margin-left: auto; margin-right: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.75rem; border-radius: var(--radius);
  font-weight: 600; font-size: 0.95rem; cursor: pointer; border: 2px solid transparent;
  transition: all var(--transition); text-align: center;
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); color: var(--white); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: transparent; }
.btn-outline:hover { background: var(--primary); color: var(--white); }
.btn-light { background: var(--white); color: var(--dark); border-color: var(--gray-200); }
.btn-light:hover { border-color: var(--primary); color: var(--primary); }
.btn-accent { background: var(--accent); color: var(--white); }
.btn-accent:hover { background: var(--accent-dark); color: var(--white); }

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height); display: flex; align-items: center;
  padding: 0 var(--space-md); transition: all var(--transition);
  background: rgba(26,29,35,0.95); backdrop-filter: blur(12px);
}
.navbar.scrolled { background: rgba(26,29,35,0.98); box-shadow: var(--shadow-lg); }
.nav-inner { max-width: var(--max-width); width: 100%; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-size: 1.25rem; font-weight: 700; color: var(--white); display: flex; align-items: center; gap: 0.5rem; }
.nav-logo img { height: 36px; }
.nav-logo span { color: var(--primary); }
.nav-links { display: flex; align-items: center; gap: var(--space-sm); }
.nav-links a { color: rgba(255,255,255,0.8); font-size: 0.9rem; font-weight: 500; padding: 0.4rem 0.6rem; border-radius: 6px; }
.nav-links a:hover, .nav-links a.active { color: var(--white); background: rgba(255,255,255,0.1); }
.nav-actions { display: flex; align-items: center; gap: 0.75rem; }
.lang-switch { color: rgba(255,255,255,0.7); font-size: 0.85rem; font-weight: 500; padding: 0.3rem 0.6rem; border-radius: 6px; cursor: pointer; background: none; border: 1px solid rgba(255,255,255,0.2); transition: all var(--transition); }
.lang-switch:hover { color: var(--white); border-color: rgba(255,255,255,0.5); }
.nav-cta { padding: 0.5rem 1.25rem !important; font-size: 0.85rem !important; background: var(--primary) !important; color: var(--white) !important; border-radius: var(--radius) !important; }
.nav-cta:hover { background: var(--primary-dark) !important; }
.menu-toggle { display: none; background: none; border: none; color: var(--white); font-size: 1.5rem; cursor: pointer; padding: 0.5rem; }

/* Mobile Menu */
.mobile-menu { display: none; position: fixed; inset: 0; z-index: 999; background: var(--dark); padding: calc(var(--nav-height) + 2rem) 2rem 2rem; flex-direction: column; gap: 1.5rem; }
.mobile-menu.open { display: flex; }
.mobile-menu a { color: var(--white); font-size: 1.25rem; font-weight: 500; }
.mobile-menu .mobile-cta { display: inline-block; background: var(--primary); padding: 0.75rem 1.5rem; border-radius: var(--radius); text-align: center; margin-top: 1rem; }

@media (max-width: 900px) {
  .nav-links, .nav-actions .btn { display: none; }
  .menu-toggle { display: block; }
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  background: linear-gradient(135deg, var(--dark) 0%, #2d3748 100%);
  padding: calc(var(--nav-height) + var(--space-xl)) 0 var(--space-xl);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(10,102,194,0.15) 0%, transparent 70%);
}
.hero-content { position: relative; z-index: 1; max-width: 700px; }
.hero h1 { color: var(--white); font-size: clamp(2.2rem, 5.5vw, 3.5rem); margin-bottom: var(--space-sm); }
.hero p { color: rgba(255,255,255,0.7); font-size: 1.15rem; margin-bottom: var(--space-md); max-width: 540px; }
.hero-actions { display: flex; gap: var(--space-sm); flex-wrap: wrap; }
.hero-trust { display: flex; gap: var(--space-md); margin-top: var(--space-lg); flex-wrap: wrap; }
.hero-trust-item { display: flex; align-items: center; gap: 0.5rem; color: rgba(255,255,255,0.6); font-size: 0.85rem; font-weight: 500; }
.hero-trust-item .num { font-size: 1.4rem; font-weight: 700; color: var(--accent); }

@media (max-width: 640px) {
  .hero { min-height: auto; padding-top: calc(var(--nav-height) + 2rem); }
  .hero-trust { gap: var(--space-sm); }
}

/* ===== Section Styles ===== */
.section-dark { background: var(--dark); color: rgba(255,255,255,0.8); }
.section-dark h2, .section-dark h3 { color: var(--white); }
.section-light { background: var(--light); }

/* ===== Product Cards ===== */
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--space-md); }
.product-card {
  background: var(--white); border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow); transition: all var(--transition);
  border: 1px solid var(--gray-200);
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.product-card-img { height: 200px; background: var(--light); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.product-card-img .icon { font-size: 4rem; opacity: 0.6; }
.product-card-body { padding: var(--space-md); }
.product-card-body h3 { margin-bottom: 0.5rem; }
.product-card-body p { color: var(--gray-600); font-size: 0.9rem; margin-bottom: 0.75rem; }
.product-card-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: var(--space-sm); }
.product-card-tags span { font-size: 0.75rem; padding: 0.2rem 0.6rem; border-radius: 20px; background: var(--primary-light); color: var(--primary); font-weight: 500; }
.product-card-link { font-weight: 600; font-size: 0.9rem; display: inline-flex; align-items: center; gap: 0.25rem; }

/* ===== Industry Grid ===== */
.industry-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: var(--space-sm); }
.industry-item { text-align: center; padding: var(--space-md) var(--space-sm); background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); transition: var(--transition); }
.industry-item:hover { transform: translateY(-2px); }
.industry-item .icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.industry-item .label { font-weight: 600; font-size: 0.9rem; color: var(--dark); }

/* ===== Why Us ===== */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-md); }
.feature-card { padding: var(--space-md); background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow); border-left: 4px solid var(--primary); }
.feature-card h3 { margin-bottom: 0.5rem; }
.feature-card p { font-size: 0.95rem; color: var(--gray-600); }

/* ===== Case Cards ===== */
.case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: var(--space-md); }
.case-card { background: var(--white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.case-card-img { height: 180px; background: var(--light); display: flex; align-items: center; justify-content: center; }
.case-card-body { padding: var(--space-md); }
.case-card-body .tag { font-size: 0.75rem; padding: 0.15rem 0.5rem; border-radius: 20px; background: var(--primary-light); color: var(--primary); font-weight: 500; }
.case-card-body h3 { margin: 0.5rem 0; }

/* ===== Stats ===== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--space-md); }
.stat-item { text-align: center; padding: var(--space-md); }
.stat-num { font-size: 2.5rem; font-weight: 700; color: var(--primary); line-height: 1.2; }
.stat-label { font-size: 0.9rem; color: var(--gray-600); margin-top: 0.3rem; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--gray-200); }
.faq-question {
  width: 100%; text-align: left; padding: var(--space-sm) 0;
  background: none; border: none; font-size: 1rem; font-weight: 600;
  color: var(--dark); cursor: pointer; display: flex; justify-content: space-between;
  align-items: center; gap: var(--space-sm);
}
.faq-question::after { content: '+'; font-size: 1.5rem; color: var(--primary); transition: transform var(--transition); }
.faq-item.open .faq-question::after { content: '−'; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; }
.faq-item.open .faq-answer { max-height: 500px; padding-bottom: var(--space-sm); }
.faq-answer p { color: var(--gray-600); font-size: 0.95rem; }

/* ===== CTA Section ===== */
.cta-section { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: var(--white); text-align: center; }
.cta-section h2 { color: var(--white); }
.cta-section p { color: rgba(255,255,255,0.85); max-width: 600px; margin: 0 auto var(--space-sm); }

/* ===== Contact Form ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-xl); }
.contact-form { display: flex; flex-direction: column; gap: var(--space-sm); }
.form-group { display: flex; flex-direction: column; gap: 0.3rem; }
.form-group label { font-weight: 600; font-size: 0.9rem; color: var(--dark); }
.form-group input, .form-group select, .form-group textarea {
  padding: 0.75rem 1rem; border: 2px solid var(--gray-200); border-radius: var(--radius);
  font-size: 0.95rem; font-family: var(--font-sans); transition: border-color var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); }
.form-group textarea { min-height: 120px; resize: vertical; }
.contact-info { display: flex; flex-direction: column; gap: var(--space-md); }
.contact-info-item { display: flex; gap: var(--space-sm); }
.contact-info-item .icon { font-size: 1.5rem; flex-shrink: 0; width: 24px; display: flex; align-items: center; }

@media (max-width: 768px) { .contact-grid { grid-template-columns: 1fr; } }

/* ===== Footer ===== */
.footer { background: var(--dark); color: rgba(255,255,255,0.7); padding: var(--space-xl) 0 var(--space-sm); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--space-lg); margin-bottom: var(--space-lg); }
.footer h4 { color: var(--white); margin-bottom: var(--space-sm); font-size: 1rem; }
.footer a { color: rgba(255,255,255,0.6); font-size: 0.9rem; }
.footer a:hover { color: var(--white); }
.footer-col ul { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: var(--space-sm); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-sm); font-size: 0.85rem; }
.footer-bottom a { font-size: 0.85rem; }

/* ===== Blog Cards ===== */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: var(--space-md); }
.blog-card { background: var(--white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.blog-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.blog-card-img { height: 180px; background: var(--light); display: flex; align-items: center; justify-content: center; }
.blog-card-body { padding: var(--space-md); }
.blog-card-body .meta { font-size: 0.8rem; color: var(--gray-400); margin-bottom: 0.5rem; }

/* ===== Table Styles ===== */
.data-table { width: 100%; border-collapse: collapse; margin: var(--space-md) 0; font-size: 0.9rem; }
.data-table th { background: var(--dark); color: var(--white); padding: 0.75rem 1rem; text-align: left; font-weight: 600; }
.data-table td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--gray-200); }
.data-table tr:nth-child(even) td { background: var(--light); }

/* ===== Breadcrumb ===== */
.breadcrumb { padding: calc(var(--nav-height) + 1rem) 0 0; font-size: 0.85rem; color: var(--gray-400); }
.breadcrumb a { color: var(--gray-600); }
.breadcrumb span { color: var(--dark); font-weight: 500; }

/* ===== Page Header ===== */
.page-header { padding: calc(var(--nav-height) + 3rem) 0 var(--space-lg); background: var(--light); text-align: center; }
.page-header h1 { margin-bottom: 0.5rem; }
.page-header p { color: var(--gray-600); max-width: 600px; margin: 0 auto; }

/* ===== Filters ===== */
.filter-bar { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: var(--space-md); }
.filter-btn { padding: 0.4rem 1rem; border-radius: 20px; border: 1px solid var(--gray-200); background: var(--white); cursor: pointer; font-size: 0.85rem; font-weight: 500; transition: var(--transition); }
.filter-btn:hover, .filter-btn.active { background: var(--primary); color: var(--white); border-color: var(--primary); }

/* ===== Animations ===== */
@keyframes fadeUp { from { opacity: 0; transform: translateY(40px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideInLeft { from { opacity: 0; transform: translateX(-40px); } to { opacity: 1; transform: translateX(0); } }
@keyframes slideInRight { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }
@keyframes scaleIn { from { opacity: 0; transform: scale(0.92); } to { opacity: 1; transform: scale(1); } }
@keyframes countUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes shimmer { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }
@keyframes lineGrow { from { transform: scaleX(0); } to { transform: scaleX(1); } }

/* Scroll-triggered reveal */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-left { opacity: 0; transform: translateX(-30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal-left.visible { opacity: 1; transform: translateX(0); }
.reveal-right { opacity: 0; transform: translateX(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal-right.visible { opacity: 1; transform: translateX(0); }
.reveal-scale { opacity: 0; transform: scale(0.94); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal-scale.visible { opacity: 1; transform: scale(1); }

/* Staggered delays */
.reveal-d1 { transition-delay: 0.05s; }
.reveal-d2 { transition-delay: 0.15s; }
.reveal-d3 { transition-delay: 0.25s; }
.reveal-d4 { transition-delay: 0.35s; }
.reveal-d5 { transition-delay: 0.45s; }

/* Hero parallax */
.hero { will-change: transform; }
.hero-bg-layer {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: center;
  transform: translateY(0); transition: transform 0.1s linear;
}

/* Counter animation */
.stat-num { opacity: 0; transform: translateY(10px); transition: all 0.5s ease; }
.stat-num.counted { opacity: 1; transform: translateY(0); }

/* Hover lift */
.hover-lift { transition: transform 0.3s ease, box-shadow 0.3s ease; }
.hover-lift:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,0,0,0.15); }

/* Section dividers */
.section-divider {
  position: absolute; top: -1px; left: 0; right: 0; height: 60px;
  background: var(--white); clip-path: polygon(0 100%, 100% 0, 100% 100%, 0 100%);
}

/* Image card overlay */
.img-card {
  position: relative; overflow: hidden; border-radius: var(--radius-lg);
}
.img-card img { width: 100%; height: 240px; object-fit: cover; transition: transform 0.5s ease; display: block; }
.img-card:hover img { transform: scale(1.06); }
.img-card-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
  display: flex; align-items: flex-end; padding: var(--space-md);
  opacity: 0; transition: opacity 0.3s ease;
}
.img-card:hover .img-card-overlay { opacity: 1; }
.img-card-overlay span { color: #fff; font-weight: 600; font-size: 0.95rem; }

/* Section accent line */
.accent-line {
  width: 60px; height: 3px; background: var(--primary);
  margin: 0 auto var(--space-sm); transform: scaleX(0);
  transition: transform 0.6s ease;
}
.accent-line.visible { transform: scaleX(1); }

/* Legacy animate classes */
.animate { animation: fadeUp 0.6s ease forwards; }
.animate-d1 { animation-delay: 0.1s; opacity: 0; }
.animate-d2 { animation-delay: 0.2s; opacity: 0; }
.animate-d3 { animation-delay: 0.3s; opacity: 0; }

/* ===== RTL Support for Arabic ===== */
html[dir=""rtl""] .nav-links { flex-direction: row-reverse; }
html[dir=""rtl""] .nav-actions { flex-direction: row-reverse; }
html[dir=""rtl""] .hero-content { text-align: right; }
html[dir=""rtl""] .hero-actions { justify-content: flex-start; flex-direction: row-reverse; }
html[dir=""rtl""] .footer-grid { direction: rtl; }
html[dir=""rtl""] .footer-bottom { direction: rtl; }
html[dir=""rtl""] .breadcrumb { direction: rtl; }
html[dir=""rtl""] .contact-grid { direction: rtl; }
html[dir=""rtl""] .faq-item .faq-question { text-align: right; }
html[dir=""rtl""] .product-card-body { text-align: right; }
html[dir=""rtl""] .feature-card { text-align: right; }
html[dir=""rtl""] .case-card-body { text-align: right; }
html[dir=""rtl""] .mobile-menu a { text-align: right; }
html[dir=""rtl""] .form-group label { text-align: right; display: block; }
html[dir=""rtl""] .contact-info-item { text-align: right; }
html[dir=""rtl""] .stat-item { text-align: center; }
html[dir=""rtl""] .blog-card-body { text-align: right; }
html[dir=""rtl""] .section-title { text-align: center; }
html[dir=""rtl""] table.data-table th,
html[dir=""rtl""] table.data-table td { text-align: right; }
html[dir=""rtl""] .filter-bar { flex-direction: row-reverse; }
html[dir=""rtl""] .hero-trust { flex-direction: row-reverse; }
html[dir=""rtl""] .nav-logo { flex-direction: row-reverse; }