/* ============================================
   众联智赢 dl-iatech.com — 全局样式
   ============================================ */

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

:root {
  --c-primary: #0f2942;
  --c-primary-light: #1a3a5c;
  --c-secondary: #1a56db;
  --c-secondary-light: #e8eefb;
  --c-accent: #0d7c3d;
  --c-accent-light: #e6f5ec;
  --c-warning: #b35c00;
  --c-warning-light: #fff3e0;
  --c-danger: #c42b2b;
  --c-danger-light: #fde8e8;
  --c-bg: #f5f7fa;
  --c-surface: #ffffff;
  --c-text: #1a1f2e;
  --c-text-secondary: #5a6478;
  --c-text-muted: #8896a6;
  --c-border: #e2e6ed;
  --c-border-light: #eef1f6;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(15,41,66,.06);
  --shadow-md: 0 4px 16px rgba(15,41,66,.08);
  --shadow-lg: 0 8px 32px rgba(15,41,66,.12);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition: .2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c-secondary); text-decoration: none; transition: color var(--transition); }
a:hover { color: #1347b8; }
a:focus-visible { outline: 2px solid var(--c-secondary); outline-offset: 2px; border-radius: 2px; }

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

/* Container */
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 800px; margin: 0 auto; padding: 0 24px; }

/* ============================================
   Header / Navigation
   ============================================ */
.site-header {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--c-primary);
}
.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--c-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  font-weight: 800;
}
.logo-img {
  height: 36px;
  width: auto;
  object-fit: contain;
}
.logo-text span { font-size: 12px; font-weight: 400; color: var(--c-text-secondary); display: block; line-height: 1.2; }

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-secondary);
  border-radius: 6px;
  transition: all var(--transition);
}
.main-nav a:hover, .main-nav a.active { color: var(--c-secondary); background: var(--c-secondary-light); }

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: var(--c-secondary);
  color: #fff !important;
  font-size: 13px;
  font-weight: 600;
  border-radius: 6px;
  transition: background var(--transition);
}
.header-cta:hover { background: #1347b8; }

/* Mobile nav toggle */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle svg { width: 24px; height: 24px; color: var(--c-text); }

/* ============================================
   Hero Section
   ============================================ */
.hero {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-light) 50%, #2d5a8a 100%);
  color: #fff;
  padding: 80px 0 72px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(26,86,219,.15) 0%, transparent 70%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; max-width: 680px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 20px;
  backdrop-filter: blur(4px);
}
.hero-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: #4ade80; }
.hero h1 { font-size: 36px; font-weight: 800; line-height: 1.3; margin-bottom: 16px; }
.hero h1 .highlight { color: #60a5fa; }
.hero .lead { font-size: 17px; line-height: 1.7; opacity: .85; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 28px;
  background: var(--c-secondary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-primary:hover { background: #1347b8; color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(26,86,219,.3); }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 28px;
  background: transparent;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,.3);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-outline:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.5); color: #fff; }

/* ============================================
   Trust Bar
   ============================================ */
.trust-bar {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  padding: 20px 0;
}
.trust-bar-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--c-text-secondary);
}
.trust-item .num { font-size: 22px; font-weight: 700; color: var(--c-primary); }
.trust-item .label { line-height: 1.3; }

/* ============================================
   Section Styles
   ============================================ */
.section { padding: 72px 0; }
.section-alt { background: var(--c-surface); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header .tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-secondary);
  background: var(--c-secondary-light);
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 12px;
  letter-spacing: .5px;
}
.section-header h2 { font-size: 28px; font-weight: 700; color: var(--c-primary); margin-bottom: 12px; }
.section-header p { font-size: 16px; color: var(--c-text-secondary); max-width: 600px; margin: 0 auto; }

/* ============================================
   L0 Cards Grid
   ============================================ */
.l0-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.l0-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.l0-card:hover { border-color: var(--c-secondary); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.l0-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 16px;
}
.l0-card h3 { font-size: 17px; font-weight: 600; color: var(--c-primary); margin-bottom: 8px; }
.l0-card .l0-code { font-size: 11px; font-weight: 600; color: var(--c-text-muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: .5px; }
.l0-card p { font-size: 14px; color: var(--c-text-secondary); line-height: 1.6; margin-bottom: 12px; }
.l0-card .tags { display: flex; flex-wrap: wrap; gap: 6px; }
.l0-card .tag-sm {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--c-bg);
  color: var(--c-text-secondary);
  font-weight: 500;
}

/* ============================================
   Industry Section
   ============================================ */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.industry-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition);
}
.industry-card:hover { border-color: var(--c-secondary); box-shadow: var(--shadow-md); }
.industry-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}
.industry-card h3 { font-size: 16px; font-weight: 600; color: var(--c-primary); margin-bottom: 6px; }
.industry-card p { font-size: 13px; color: var(--c-text-secondary); }

/* ============================================
   Why Choose Us
   ============================================ */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.advantage-item {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
}
.advantage-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--c-secondary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}
.advantage-item h3 { font-size: 15px; font-weight: 600; color: var(--c-primary); margin-bottom: 4px; }
.advantage-item p { font-size: 14px; color: var(--c-text-secondary); }

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-light) 100%);
  color: #fff;
  padding: 64px 0;
  text-align: center;
}
.cta-section h2 { font-size: 28px; font-weight: 700; margin-bottom: 12px; }
.cta-section p { font-size: 16px; opacity: .8; margin-bottom: 28px; }
.cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.btn-white {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 32px;
  background: #fff;
  color: var(--c-primary);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-white:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,0,0,.2); color: var(--c-primary); }

/* ============================================
   About Page
   ============================================ */
.page-hero {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-light) 100%);
  color: #fff;
  padding: 56px 0 48px;
  text-align: center;
}
.page-hero h1 { font-size: 32px; font-weight: 700; margin-bottom: 8px; }
.page-hero p { font-size: 16px; opacity: .8; }

.timeline-v {
  position: relative;
  padding-left: 32px;
}
.timeline-v::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--c-border);
}
.timeline-v-item {
  position: relative;
  margin-bottom: 32px;
}
.timeline-v-dot {
  position: absolute;
  left: -27px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--c-secondary);
  background: var(--c-surface);
}
.timeline-v-item .year { font-size: 13px; font-weight: 600; color: var(--c-secondary); margin-bottom: 4px; }
.timeline-v-item .desc { font-size: 14px; color: var(--c-text-secondary); }

/* ============================================
   Contact Page
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.contact-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.contact-info-item {
  display: flex;
  gap: 14px;
  margin-bottom: 24px;
}
.contact-info-item:last-child { margin-bottom: 0; }
.contact-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--c-secondary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.contact-info-item h3 { font-size: 14px; font-weight: 600; color: var(--c-primary); margin-bottom: 2px; }
.contact-info-item p { font-size: 14px; color: var(--c-text-secondary); }
.contact-info-item a { font-weight: 500; }

.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--c-text); margin-bottom: 6px; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-size: 14px;
  font-family: var(--font);
  color: var(--c-text);
  background: var(--c-surface);
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--c-secondary);
  box-shadow: 0 0 0 3px rgba(26,86,219,.1);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.btn-submit {
  padding: 12px 32px;
  background: var(--c-secondary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}
.btn-submit:hover { background: #1347b8; }

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--c-primary);
  color: rgba(255,255,255,.7);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
.footer-brand .logo { color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 13px; line-height: 1.6; }
.footer-col h4 { color: #fff; font-size: 14px; font-weight: 600; margin-bottom: 12px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: rgba(255,255,255,.6); font-size: 13px; transition: color var(--transition); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 900px) {
  .l0-grid { grid-template-columns: repeat(2, 1fr); }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 26px; }
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 22px; }
  .l0-grid { grid-template-columns: 1fr; }
  .industry-grid { grid-template-columns: 1fr 1fr; }
  .trust-bar-inner { gap: 24px; }
  .main-nav { display: none; }
  .nav-toggle { display: block; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    padding: 12px 24px;
    box-shadow: var(--shadow-md);
  }
  .footer-grid { grid-template-columns: 1fr; }
}

/* Customer Tag */
.customer-tag {
  display: inline-block;
  padding: 6px 14px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-size: 13px;
  color: var(--c-text-secondary);
  transition: all 0.2s;
}
.customer-tag:hover {
  background: var(--c-white);
  border-color: var(--c-secondary);
  color: var(--c-secondary);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0,0,0,.06);
}

/* Scroll Animations */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in-left {
  opacity: 0;
  transform: translateX(-24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}
.fade-in-right {
  opacity: 0;
  transform: translateX(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}
.scale-in {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}
.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }

/* Mobile Enhancements */
@media (max-width: 768px) {
  .hero-title { font-size: 28px; }
  .hero-subtitle { font-size: 15px; }
  .stat-card { padding: 16px 12px; }
  .stat-number { font-size: 24px; }
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 22px; }
  .l0-card { padding: 20px; }
  .industry-card { padding: 16px; }
  .cta-section .btn-hero { padding: 14px 24px; font-size: 15px; }
  .header-inner { padding: 12px 0; }
  .logo-img { height: 32px; }
  .nav-link { display: none; }
  .mobile-menu-btn { display: flex; }
  .nav-mobile-active .main-nav {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-white);
    flex-direction: column;
    padding: 16px;
    gap: 8px;
    box-shadow: var(--shadow-md);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  }
  .nav-mobile-active .nav-link { display: block; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 24px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .section-header h2 { font-size: 20px; }
}

/* Print */
@media print {
  .site-header, .site-footer, .cta-section { position: static; }
  .hero { background: var(--c-primary) !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .l0-card, .industry-card, .advantage-item { break-inside: avoid; }
  .fade-in, .fade-in-left, .fade-in-right, .scale-in { opacity: 1 !important; transform: none !important; }
}