/* ===== 羽飞电子科技 - 全站通用样式 ===== */
/* 风格参考：DJI极简科技风 + JOUAV行业专业感 + 极飞的现代感 */

:root {
  --primary: #0052D9;
  --primary-dark: #003BA1;
  --primary-light: #E8F0FE;
  --accent: #00B4D8;
  --dark: #1A1A2E;
  --text: #333333;
  --text-light: #666666;
  --text-muted: #999999;
  --bg: #FFFFFF;
  --bg-light: #F5F7FA;
  --bg-dark: #0F1923;
  --border: #E5E5E5;
  --success: #00C853;
  --radius: 8px;
  --shadow: 0 2px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.nav.scrolled {
  box-shadow: var(--shadow);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  font-size: 15px;
  color: var(--text);
  transition: var(--transition);
  position: relative;
}

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

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  background: var(--primary) !important;
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 14px !important;
  transition: var(--transition);
}

.nav-cta:hover {
  background: var(--primary-dark) !important;
}

.nav-cta::after { display: none !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--dark);
  transition: var(--transition);
}

/* ===== HERO SECTION ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--bg-dark) 0%, #16213E 50%, #0F3460 100%);
  overflow: hidden;
  padding-top: 72px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 70% 30%, rgba(0,82,217,0.15) 0%, transparent 50%),
              radial-gradient(circle at 30% 70%, rgba(0,180,216,0.1) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text h1 {
  font-size: 48px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-text h1 span {
  background: linear-gradient(135deg, var(--accent), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text p {
  font-size: 18px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 36px;
  line-height: 1.8;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,82,217,0.4);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.1);
}

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

.hero-graphic {
  width: 400px;
  height: 400px;
  position: relative;
}

.hero-graphic .drone-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 120px;
  opacity: 0.9;
  filter: drop-shadow(0 20px 40px rgba(0,82,217,0.3));
}

.hero-graphic .ring {
  position: absolute;
  top: 50%;
  left: 50%;
  border: 2px solid rgba(0,180,216,0.2);
  border-radius: 50%;
  animation: pulse 3s ease-in-out infinite;
}

.hero-graphic .ring:nth-child(2) {
  width: 200px; height: 200px;
  margin: -100px 0 0 -100px;
}

.hero-graphic .ring:nth-child(3) {
  width: 300px; height: 300px;
  margin: -150px 0 0 -150px;
  animation-delay: 0.5s;
}

.hero-graphic .ring:nth-child(4) {
  width: 400px; height: 400px;
  margin: -200px 0 0 -200px;
  animation-delay: 1s;
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.05); }
}

/* ===== STATS BAR ===== */
.stats {
  background: var(--bg);
  padding: 40px 0;
  border-bottom: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

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

.stat-number {
  font-size: 40px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.stat-label {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 8px;
}

/* ===== SECTION STYLES ===== */
.section {
  padding: 100px 0;
}

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

.section-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

.section-alt { background: var(--bg-light); }
.section-dark { background: var(--bg-dark); color: #fff; }
.section-dark .section-title { color: #fff; }
.section-dark .section-desc { color: rgba(255,255,255,0.6); }
.section-dark .section-label { color: var(--accent); }

/* ===== SERVICES GRID ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.service-card {
  background: var(--bg);
  border-radius: 12px;
  padding: 40px 32px;
  transition: var(--transition);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: var(--transition);
}

.service-card:hover::before {
  opacity: 1;
}

.service-icon {
  width: 56px;
  height: 56px;
  background: var(--primary-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 24px;
}

.service-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}

.service-card p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.7;
}

.service-card .service-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.service-card .service-link:hover {
  gap: 12px;
}

/* ===== ABOUT SECTION ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-image {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 16px;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 80px;
}

.about-text h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 20px;
}

.about-text p {
  font-size: 16px;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 16px;
}

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

.about-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--text);
}

.about-feature .check {
  width: 20px;
  height: 20px;
  background: var(--success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 12px;
  flex-shrink: 0;
}

/* ===== PARTNERS ===== */
.partners {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  padding: 20px 0;
}

.partner-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-muted);
  opacity: 0.6;
  transition: var(--transition);
}

.partner-logo:hover { opacity: 1; }

/* ===== CTA SECTION ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 80px 0;
  text-align: center;
}

.cta-section h2 {
  font-size: 36px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 18px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
}

.btn-white {
  background: #fff;
  color: var(--primary);
  padding: 14px 36px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  font-size: 20px;
  color: #fff;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255,255,255,0.5);
}

.footer-col h4 {
  font-size: 16px;
  color: #fff;
  margin-bottom: 20px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 12px;
  transition: var(--transition);
}

.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

/* ===== SUBDOMAIN PAGE STYLES ===== */
.page-hero {
  padding-top: 72px;
  padding-bottom: 80px;
  background: linear-gradient(135deg, var(--bg-dark) 0%, #16213E 100%);
  text-align: center;
}

.page-hero h1 {
  font-size: 42px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 18px;
  color: rgba(255,255,255,0.6);
  max-width: 600px;
  margin: 0 auto;
}

.page-hero .breadcrumb {
  font-size: 14px;
  color: rgba(255,255,255,0.4);
  margin-bottom: 20px;
}

.page-hero .breadcrumb a {
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.page-hero .breadcrumb a:hover { color: var(--accent); }

/* ===== FEATURE LIST ===== */
.feature-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.feature-item {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: var(--bg);
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.feature-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.feature-item h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.feature-item p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== TIMELINE ===== */
.timeline {
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -33px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--primary);
  border-radius: 50%;
  border: 3px solid var(--primary-light);
}

.timeline-item h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}

.timeline-item p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.7;
}

/* ===== CONTACT FORM ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

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

.contact-info .info-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.contact-info .info-item h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 4px;
}

.contact-info .info-item p {
  font-size: 14px;
  color: var(--text-light);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  margin-bottom: 16px;
  transition: var(--transition);
  font-family: inherit;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0,82,217,0.1);
}

.contact-form textarea { height: 120px; resize: vertical; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .hero-content { grid-template-columns: 1fr; text-align: center; }
  .hero-text h1 { font-size: 32px; }
  .hero-buttons { justify-content: center; }
  .hero-visual { display: none; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .about-features { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section { padding: 60px 0; }
  .section-title { font-size: 28px; }
  .page-hero h1 { font-size: 30px; }
}