/* =============================================
   蓝象广告 · 迈富时保定运营中心
   企业官网 — 深色AI科技风
   GEO优化版 | 2026
   ============================================= */

/* --- CSS Variables --- */
:root {
  --bg-primary: #0a0e27;
  --bg-secondary: #111640;
  --bg-card: #151a3d;
  --bg-card-hover: #1a2050;
  --bg-gradient-1: linear-gradient(135deg, #0a0e27 0%, #1a1050 50%, #0a0e27 100%);
  --bg-gradient-2: linear-gradient(135deg, #151a3d 0%, #1a1050 100%);

  --accent-blue: #00d4ff;
  --accent-blue-dim: rgba(0, 212, 255, 0.15);
  --accent-purple: #7c3aed;
  --accent-purple-dim: rgba(124, 58, 237, 0.15);
  --accent-green: #10b981;

  --text-primary: #e8edf5;
  --text-secondary: #8892b0;
  --text-muted: #5a6380;
  --text-accent: #00d4ff;

  --border-color: rgba(0, 212, 255, 0.1);
  --border-glow: rgba(0, 212, 255, 0.3);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.1);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 72px;
}

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

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

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

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: var(--transition);
}
a:hover { color: #66e5ff; }

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

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: var(--accent-blue-dim);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--accent-blue); }

/* --- Particle Background Canvas --- */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 100px 0;
  position: relative;
}

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

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent-blue);
  background: var(--accent-blue-dim);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #fff 30%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- Header / Nav --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 14, 39, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
  transition: var(--transition);
}

.header.scrolled {
  background: rgba(10, 14, 39, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary) !important;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.logo-sub {
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--text-secondary);
  display: block;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-blue);
  background: var(--accent-blue-dim);
}

.nav-cta {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple)) !important;
  color: #fff !important;
  padding: 10px 24px !important;
  border-radius: var(--radius-sm) !important;
  font-weight: 600 !important;
}
.nav-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* Mobile Menu */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

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

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--accent-blue);
  background: var(--accent-blue-dim);
  padding: 8px 20px;
  border-radius: 20px;
  margin-bottom: 24px;
  border: 1px solid rgba(0, 212, 255, 0.2);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 20%, var(--accent-blue) 50%, var(--accent-purple) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 580px;
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
  font-family: var(--font-sans);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.4);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue);
}
.btn-secondary:hover {
  background: var(--accent-blue-dim);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.85rem;
}

/* --- Stats Bar --- */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* --- Grid System --- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
  opacity: 0;
  transition: var(--transition);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.card:hover::before { opacity: 1; }

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-blue-dim);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Service Tiers --- */
.service-tier {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: var(--transition);
}

.service-tier.featured {
  border-color: var(--accent-blue);
  position: relative;
}
.service-tier.featured::after {
  content: '核心服务';
  position: absolute;
  top: -12px;
  right: 24px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: 12px;
}

/* --- Timeline --- */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-blue), var(--accent-purple));
}

.timeline-item {
  position: relative;
  padding-bottom: 32px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -38px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-blue);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--accent-blue);
}

.timeline-year {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: 4px;
}

.timeline-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* --- FAQ Accordion --- */
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: var(--border-glow); }

.faq-question {
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--accent-blue); }

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--accent-blue);
  transition: var(--transition);
}
.faq-item.active .faq-question::after { content: '−'; }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
}
.faq-item.active .faq-answer {
  max-height: 600px;
  padding: 0 24px 20px;
}

/* --- Case Study Cards --- */
.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--border-glow);
}

.case-header {
  padding: 24px 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.case-industry {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-blue);
  background: var(--accent-blue-dim);
  padding: 4px 12px;
  border-radius: 12px;
}

.case-body {
  padding: 16px 24px;
}

.case-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.case-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.case-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding: 16px 24px 24px;
  border-top: 1px solid var(--border-color);
}

.case-stat {
  text-align: center;
}

.case-stat-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-blue);
}

.case-stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --- Awards Grid --- */
.award-item {
  text-align: center;
  padding: 28px 20px;
}

.award-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.award-name {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.award-org {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.award-year {
  font-size: 0.75rem;
  color: var(--accent-blue);
  font-weight: 600;
}

/* --- Insight/Article Cards --- */
.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}
.insight-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--border-glow);
}

.insight-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.insight-tag {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-purple);
  background: var(--accent-purple-dim);
  padding: 3px 10px;
  border-radius: 10px;
}

.insight-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.insight-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Contact Page --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-info-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-blue-dim);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-info-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.contact-info-value {
  font-size: 1rem;
  color: var(--text-primary);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 12px;
  line-height: 1.6;
}

.footer-heading {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-blue);
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.footer-links a:hover { color: var(--accent-blue); }

.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;
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

/* --- Breadcrumbs --- */
.breadcrumbs {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding-top: calc(var(--header-height) + 40px);
  padding-bottom: 20px;
}
.breadcrumbs a { color: var(--text-secondary); }
.breadcrumbs a:hover { color: var(--accent-blue); }
.breadcrumbs span { color: var(--text-muted); }

/* --- Page Hero Inner --- */
.page-hero {
  padding: calc(var(--header-height) + 60px) 0 60px;
  position: relative;
}
.page-hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), var(--accent-purple), transparent);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .hero-title { font-size: 2.2rem; }
  .section-title { font-size: 1.8rem; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 39, 0.98);
    border-bottom: 1px solid var(--border-color);
    padding: 16px;
    gap: 4px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; width: 100%; }

  .mobile-toggle { display: block; }

  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  .contact-grid { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr; }

  .case-stats { grid-template-columns: repeat(3, 1fr); }
}

/* --- Case Filter Buttons --- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 48px;
}
.filter-btn {
  padding: 10px 24px;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font-sans);
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
}
.filter-btn:hover {
  color: var(--accent-blue);
  border-color: var(--border-glow);
  background: var(--accent-blue-dim);
}
.filter-btn.active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border-color: transparent;
}
.case-card.hidden {
  display: none;
}
/* --- Summary Stats Section --- */
.summary-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 48px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin: 80px 0;
  position: relative;
  overflow: hidden;
}
.summary-stats::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple), var(--accent-blue));
}
.summary-stat {
  text-align: center;
  position: relative;
  z-index: 1;
}
.summary-stat-value {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.summary-stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 6px;
}
.summary-stat-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

@media (max-width: 480px) {
  .hero-title { font-size: 1.8rem; }
  .hero-desc { font-size: 1rem; }
  .stats-bar { grid-template-columns: 1fr 1fr; gap: 16px; padding: 20px; }
  .stat-number { font-size: 1.5rem; }
  .grid-4 { grid-template-columns: 1fr; }
  .summary-stats { grid-template-columns: repeat(2, 1fr); gap: 24px; padding: 32px 24px; }
}