/* ==========================================
   Huinengda Tech - Main Stylesheet
   Dark Theme | Professional IT Services
   ========================================== */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2332;
  --bg-card-hover: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-primary: #059669;
  --accent-secondary: #34d399;
  --accent-glow: rgba(5, 150, 105, 0.15);
  --border-color: #1e293b;
  --border-light: #334155;
  --gradient-main: linear-gradient(135deg, #059669, #0d9488);
  --gradient-hero: linear-gradient(135deg, #0a0e17 0%, #0f172a 50%, #059669 100%);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(5, 150, 105, 0.1);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 72px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--accent-secondary);
}

img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

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

.text-center { text-align: center; }
.text-center p { max-width: 600px; margin-left: auto; margin-right: auto; }

.section-label {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(5, 150, 105, 0.1);
  border: 1px solid rgba(5, 150, 105, 0.2);
  color: var(--accent-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 48px;
}

section { padding: 80px 0; }

/* Header */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: transparent;
  transition: var(--transition);
  height: var(--header-height);
}

.header.scrolled {
  background: rgba(10, 14, 23, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 20px rgba(0,0,0,0.3);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary) !important;
}

.logo-icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
}

.logo-text { font-size: 1.15rem; font-weight: 700; }
.logo-text span { color: var(--accent-secondary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--gradient-main);
  transition: var(--transition);
  border-radius: 2px;
}

.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  padding: 8px 20px !important;
  border-radius: 100px !important;
  background: var(--gradient-main) !important;
  color: #fff !important;
  font-weight: 600 !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(5, 150, 105, 0.3);
}

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

.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%; right: -20%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(5, 150, 105, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%; left: -10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(13, 148, 136, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 100px;
  background: rgba(5, 150, 105, 0.1);
  border: 1px solid rgba(5, 150, 105, 0.2);
  color: var(--accent-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 20px;
}

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

@keyframes pulse-dot { 0%,100%{opacity:1} 50%{opacity:0.4} }

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-title .highlight {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  color: var(--text-secondary);
  font-size: 1.15rem;
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 520px;
}

.hero-actions { display: flex; gap: 16px; margin-bottom: 40px; }

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-main);
  color: #fff !important;
  box-shadow: 0 4px 15px rgba(5, 150, 105, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(5, 150, 105, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary) !important;
  border: 1px solid var(--border-light);
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
  background: rgba(5, 150, 105, 0.08);
}

.hero-stats { display: flex; gap: 32px; }

.hero-stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }

.hero-visual { display: flex; justify-content: center; align-items: center; }

.hero-code-block {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
}

.hero-code-dots { display: flex; gap: 8px; margin-bottom: 20px; }
.hero-code-dots span { width: 12px; height: 12px; border-radius: 50%; }
.hero-code-dots span:nth-child(1) { background: #ef4444; }
.hero-code-dots span:nth-child(2) { background: #eab308; }
.hero-code-dots span:nth-child(3) { background: #22c55e; }

.hero-code-content {
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.hero-code-content .comment { color: #6b7280; }
.hero-code-content .keyword { color: #6ee7b7; }
.hero-code-content .function { color: #60a5fa; }
.hero-code-content .variable { color: #f472b6; }
.hero-code-content .string { color: #fbbf24; }

/* Services */
.services { background: var(--bg-secondary); }
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: var(--transition);
  cursor: default;
}

.service-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}

.service-icon { font-size: 2rem; margin-bottom: 16px; }
.service-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 12px; }
.service-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }

/* About */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text p { color: var(--text-secondary); margin-bottom: 16px; font-size: 1rem; }

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}

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

.about-feature-icon {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: rgba(5, 150, 105, 0.1);
  color: var(--accent-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
}

.about-feature-text h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 2px; }
.about-feature-text p { font-size: 0.8rem; margin-bottom: 0; color: var(--text-muted); }

.about-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.about-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}

.about-stat-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

.about-stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* Process */
.process-steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; margin-top: 40px; }

.process-step {
  text-align: center;
  padding: 24px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.process-step:hover {
  border-color: var(--accent-primary);
  transform: translateY(-4px);
}

.process-num {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--gradient-main);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 auto 12px;
}

.process-step h4 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.process-step p { font-size: 0.85rem; color: var(--text-muted); }

/* Testimonials */
.testimonials { background: var(--bg-secondary); }
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}

.testimonial-card:hover { border-color: var(--border-light); transform: translateY(-2px); }
.testimonial-stars { color: #fbbf24; font-size: 0.9rem; margin-bottom: 12px; }
.testimonial-text { color: var(--text-secondary); font-size: 0.9rem; font-style: italic; line-height: 1.7; margin-bottom: 16px; }
.testimonial-author { font-size: 0.85rem; font-weight: 600; }
.testimonial-role { font-size: 0.8rem; color: var(--text-muted); }

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

.team-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  transition: var(--transition);
}

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

.team-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 2rem;
  color: #fff;
  font-weight: 700;
}

.team-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.team-role { font-size: 0.85rem; color: var(--accent-secondary); margin-bottom: 12px; }
.team-bio { font-size: 0.85rem; color: var(--text-muted); line-height: 1.5; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-info h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 16px; }
.contact-info > p { color: var(--text-secondary); margin-bottom: 32px; }

.contact-details { display: flex; flex-direction: column; gap: 20px; margin-bottom: 32px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }

.contact-icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(5, 150, 105, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.contact-item h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; }
.contact-item p, .contact-item a { font-size: 0.9rem; color: var(--text-secondary); }
.contact-item a:hover { color: var(--accent-secondary); }

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

.contact-form h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 8px; }
.contact-form > p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 24px; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 500; margin-bottom: 6px; color: var(--text-secondary); }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.1);
}

.form-group textarea { min-height: 120px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.btn-full { width: 100%; }

/* Page Header */
.page-header {
  padding: 120px 0 60px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.breadcrumb { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 16px; }
.breadcrumb a { color: var(--accent-secondary); }
.page-header h1 { font-size: 2.5rem; font-weight: 700; margin-bottom: 12px; }
.page-header p { color: var(--text-secondary); font-size: 1.1rem; }

/* Policy */
.policy-section { background: var(--bg-primary); padding: 60px 0 100px; }
.policy-content { max-width: 800px; margin: 0 auto; }
.policy-content .last-updated { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 36px; font-style: italic; }

.policy-content h2 {
  font-size: 1.5rem; font-weight: 700; color: var(--text-primary);
  margin: 40px 0 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border-color);
}

.policy-content h3 { font-size: 1.15rem; font-weight: 600; color: var(--accent-secondary); margin: 28px 0 12px; }
.policy-content p { color: var(--text-secondary); margin-bottom: 14px; line-height: 1.8; }
.policy-content ul, .policy-content ol { margin: 12px 0 20px; padding-left: 24px; }
.policy-content li { color: var(--text-secondary); margin-bottom: 8px; line-height: 1.7; padding-left: 8px; }
.policy-content ul li::marker { color: var(--accent-primary); }
.policy-content strong { color: var(--text-primary); }
.policy-content a { color: var(--accent-secondary); }
.policy-content a:hover { text-decoration: underline; }

/* Services Detail */
.services-detail-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.service-detail-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  transition: var(--transition);
}

.service-detail-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.service-detail-icon { font-size: 2.2rem; margin-bottom: 16px; }
.service-detail-card h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 10px; }
.service-detail-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; margin-bottom: 16px; }
.service-detail-card ul { margin: 0; padding-left: 20px; }
.service-detail-card ul li { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 6px; line-height: 1.6; }
.service-detail-card ul li::marker { color: var(--accent-primary); }

/* Values */
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 40px; }

.value-card {
  text-align: center;
  padding: 28px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.value-card:hover { border-color: var(--accent-primary); transform: translateY(-3px); }
.value-icon { font-size: 2rem; margin-bottom: 12px; }
.value-card h4 { font-size: 1rem; font-weight: 600; margin-bottom: 8px; }
.value-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.5; }

.about-content-full p { color: var(--text-secondary); margin-bottom: 16px; line-height: 1.8; }
.about-content-full h2 { font-size: 1.5rem; font-weight: 700; color: var(--text-primary); margin: 40px 0 16px; }

/* Footer */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
}

.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; margin-top: 12px; line-height: 1.7; }
.footer h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 16px; color: var(--text-primary); }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: var(--text-muted); font-size: 0.9rem; }
.footer-links a:hover { color: var(--accent-secondary); }

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p { color: var(--text-muted); font-size: 0.85rem; }
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a { color: var(--text-muted); font-size: 0.85rem; }
.footer-bottom-links a:hover { color: var(--accent-secondary); }

/* Animations */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* CTA */
.cta { text-align: center; }
.cta p { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 32px; }

/* Responsive */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-description { margin: 0 auto 32px; }
  .hero-actions, .hero-stats { justify-content: center; }
  .hero-visual { display: none; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-stats { max-width: 500px; margin: 0 auto; }
  .process-steps { grid-template-columns: repeat(3, 1fr); }
  .testimonials-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .services-detail-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed; top: var(--header-height); left: 0; right: 0;
    background: var(--bg-secondary); flex-direction: column; padding: 24px; gap: 16px;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%); opacity: 0; pointer-events: none; transition: var(--transition);
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: all; }
  .nav-toggle { display: flex; }
  .hero-title { font-size: 2rem; }
  .section-title { font-size: 1.6rem; }
  section { padding: 60px 0; }
  .services-grid { grid-template-columns: 1fr; }
  .about-features { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .process-steps { grid-template-columns: 1fr 1fr; }
  .team-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .page-header h1 { font-size: 1.8rem; }
  .policy-content h2 { font-size: 1.3rem; }
  .hero-stats { flex-direction: column; gap: 16px; align-items: center; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 1.6rem; }
  .hero-actions { flex-direction: column; }
  .about-stats { grid-template-columns: 1fr; }
  .process-steps { grid-template-columns: 1fr; }
  .contact-form { padding: 24px 16px; }
}