/* ==========================================================================
   北京久在航空科技有限公司 - 纯文字极简高阶版 CSS 样式表 (包含透明 Logo)
   (目录：C:\Users\just1\Desktop\新建文件夹\久在新网网站程序、数据库备份2022.6.23)
   ========================================================================== */

:root {
  --bg-dark: #060913;
  --bg-card: rgba(12, 19, 36, 0.78);
  --bg-card-hover: rgba(18, 29, 54, 0.88);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 242, 254, 0.3);
  
  --primary: #00F2FE;
  --primary-gradient: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
  --accent-gold: #FFD700;
  --accent-purple: #7F00FF;
  --accent-green: #00E676;
  
  --text-main: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: 'Fira Code', Consolas, Monaco, monospace;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Background Cyber Grid Lines */
.bg-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -1;
  pointer-events: none;
}

/* Container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 90px 0;
  position: relative;
}

/* Typography & Text Badges */
.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-gold-text {
  background: linear-gradient(135deg, #FFF 0%, #FFD700 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-badge {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  display: inline-block;
  letter-spacing: 1px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin-bottom: 48px;
}

.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #000;
  box-shadow: 0 4px 16px rgba(0, 242, 254, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 242, 254, 0.45);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

/* Glass Card */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
}

.glass-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}

/* Navbar & Brand Logo */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 18px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 10px 0;
  background: rgba(6, 9, 19, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-logo-img {
  height: 38px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 8px rgba(0, 242, 254, 0.3));
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.4rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding-top: 170px;
  padding-bottom: 90px;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-content {
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 1.18rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-btns {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 56px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.stat-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  padding: 20px 12px;
  border-radius: var(--radius-md);
  text-align: center;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  font-family: var(--font-mono);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* Certifications Text Grid */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.cert-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 215, 0, 0.2);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  transition: var(--transition);
}

.cert-card:hover {
  border-color: var(--accent-gold);
  background: rgba(255, 215, 0, 0.04);
}

.cert-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-gold);
  margin-bottom: 8px;
}

.cert-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
}

/* AI Spotlight Pure Text Box */
.ai-spotlight {
  border: 1px solid var(--border-glow);
  background: linear-gradient(135deg, rgba(127, 0, 255, 0.08) 0%, rgba(0, 242, 254, 0.08) 100%);
  border-radius: var(--radius-lg);
  padding: 44px;
  margin-bottom: 60px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
}

.ai-title {
  font-size: 2.1rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.ai-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.code-box {
  background: #090E1A;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #A7F3D0;
}

/* Product Controls & Grid */
.product-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 40px;
}

.tab-buttons {
  display: flex;
  gap: 8px;
  background: rgba(255, 255, 255, 0.02);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.tab-btn {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover { color: var(--text-main); }
.tab-btn.active {
  background: var(--primary-gradient);
  color: #000;
}

.search-box {
  position: relative;
  width: 320px;
}

.search-input {
  width: 100%;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 0.88rem;
  outline: none;
  transition: var(--transition);
}

.search-input:focus {
  border-color: var(--primary);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 24px;
}

.product-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 28px;
}

.product-num-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--primary);
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.product-title {
  font-size: 1.28rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.product-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.tag-item {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.product-footer {
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.view-detail-btn {
  color: var(--primary);
  font-size: 0.84rem;
  font-weight: 600;
  background: rgba(0, 242, 254, 0.05);
  border: 1px solid rgba(0, 242, 254, 0.2);
  border-radius: var(--radius-sm);
  padding: 5px 14px;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.view-detail-btn:hover {
  background: var(--primary);
  color: #000;
  border-color: var(--primary);
  transform: translateX(2px);
}


/* National Offices Pure Text Grid */
.network-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.office-chip {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  padding: 18px 12px;
  border-radius: var(--radius-md);
  text-align: center;
}

.office-chip.hq {
  border-color: var(--primary);
  background: rgba(0, 242, 254, 0.06);
}

.office-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
}

.office-tag {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* About Us */
.about-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.8;
}

/* Careers Grid */
.careers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 24px;
}

.job-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.job-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.job-location {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.job-section-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  margin: 16px 0 8px;
}

.job-list {
  list-style: none;
  margin-bottom: 16px;
  flex-grow: 1;
}

.job-list li {
  position: relative;
  padding-left: 16px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-size: 0.875rem;
}

.job-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--primary);
}

/* Contact Pure Text Grid */
.contact-wrapper-pure {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

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

.contact-card-pure h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
}

.contact-detail-item {
  margin-bottom: 20px;
}

.contact-detail-item h4 {
  font-size: 0.92rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 4px;
  text-transform: uppercase;
}

.contact-detail-item p {
  color: var(--text-main);
  font-size: 1.05rem;
}

/* Modal Drawer */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: #0B1220;
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 820px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 36px;
  position: relative;
  transform: translateY(20px);
  transition: var(--transition);
}

.modal-backdrop.active .modal-content {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
}

.modal-body h3 {
  font-size: 1.15rem;
  color: var(--primary);
  margin: 24px 0 12px;
}

.modal-body ul {
  padding-left: 20px;
  color: var(--text-secondary);
}

.modal-body li {
  margin-bottom: 8px;
}

/* Footer & Logo */
footer {
  border-top: 1px solid var(--border-color);
  padding: 50px 0 24px;
  background: rgba(4, 7, 14, 0.96);
}

.footer-logo-img {
  height: 42px;
  width: auto;
  object-fit: contain;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.3));
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}

.footer-brand p {
  color: var(--text-secondary);
  margin-top: 8px;
  font-size: 0.88rem;
}

.footer-col h4 {
  color: var(--text-main);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
}

.footer-links a:hover { color: var(--primary); }

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.7rem; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-spotlight { grid-template-columns: 1fr; }
  .network-grid { grid-template-columns: repeat(3, 1fr); }
  .about-wrapper { grid-template-columns: 1fr; }
  .contact-wrapper-pure { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .hero-title { font-size: 2.1rem; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: 1fr; }
  .network-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: rgba(6, 9, 19, 0.96);
    flex-direction: column;
    justify-content: center;
    transition: var(--transition);
  }
  .nav-menu.active { left: 0; }
  .mobile-toggle { display: block; }
  .product-controls { flex-direction: column; align-items: stretch; }
  .search-box { width: 100%; }
}