/* 基础样式和变量 */
:root {
  /* 主色调 */
  --primary-blue: #003366;
  --accent-red: #CC3333;
  --dark-blue: #001a33;
  --light-blue: #0066cc;
  --dark-red: #990000;
  
  /* 中性色 */
  --white: #ffffff;
  --light-gray: #f5f5f5;
  --gray: #cccccc;
  --dark-gray: #333333;
  --black: #000000;
  
  /* 特效色 */
  --glow-blue: #00ffff;
  --glow-red: #ff3333;
  --radar-green: #00ff00;
  
  /* 字体 */
  --font-display: 'Orbitron', monospace;
  --font-body: 'Roboto', sans-serif;
  
  /* 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  
  /* 边框半径 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* 阴影 */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 20px rgba(0, 255, 255, 0.3);
}

/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  line-height: 1.6;
  color: var(--white);
  background: var(--dark-blue);
  overflow-x: hidden;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(0, 51, 102, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--accent-red);
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-logo img {
  width: 40px;
  height: 40px;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-menu a {
  color: var(--white);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-menu a::before {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-red);
  transition: width 0.3s ease;
}

.nav-menu a:hover::before,
.nav-menu a.active::before {
  width: 100%;
}

.military-access a {
  background: linear-gradient(45deg, var(--accent-red), var(--dark-red));
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  border: 1px solid var(--accent-red);
  box-shadow: var(--shadow-glow);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.language-selector {
  display: flex;
  gap: var(--spacing-xs);
}

.lang-btn {
  background: transparent;
  border: 1px solid var(--gray);
  color: var(--white);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
}

.lang-btn.active,
.lang-btn:hover {
  background: var(--accent-red);
  border-color: var(--accent-red);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: var(--white);
  margin: 3px 0;
  transition: 0.3s;
}

/* 首屏区域 */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.spectrum-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

#spectrumCanvas {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 50%, var(--dark-blue) 100%);
}

.radar-overlay {
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  height: 300px;
  z-index: 2;
  opacity: 0.3;
}

.radar-scanner {
  width: 100%;
  height: 100%;
  border: 2px solid var(--radar-green);
  border-radius: 50%;
  position: relative;
}

.radar-scanner::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 2px;
  height: 50%;
  background: linear-gradient(to bottom, var(--radar-green), transparent);
  transform-origin: bottom;
  transform: translate(-50%, -100%) rotate(0deg);
  animation: radarSweep 3s linear infinite;
}

@keyframes radarSweep {
  0% { transform: translate(-50%, -100%) rotate(0deg); }
  100% { transform: translate(-50%, -100%) rotate(360deg); }
}

.hero-content {
  position: relative;
  z-index: 3;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
}

.hero-title {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

.highlight {
  color: var(--accent-red);
  text-shadow: 0 0 10px var(--glow-red);
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--light-gray);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-lg);
}

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

.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--glow-blue);
  text-shadow: 0 0 15px var(--glow-blue);
}

.stat-label {
  display: block;
  font-size: 0.9rem;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 1px;
}



.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
}

.scroll-arrow {
  width: 30px;
  height: 30px;
  border: 2px solid var(--white);
  border-left: none;
  border-top: none;
  transform: rotate(45deg);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0) rotate(45deg); }
  40% { transform: translateY(-10px) rotate(45deg); }
  60% { transform: translateY(-5px) rotate(45deg); }
}

/* 通用样式 */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--spacing-sm);
}

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

/* 解决方案部分 */
.solutions-section {
  padding: var(--spacing-xl) 0;
  background: linear-gradient(180deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
}

.solutions-tabs {
  max-width: 1000px;
  margin: 0 auto;
}

.tab-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.tab-btn {
  background: transparent;
  border: 2px solid var(--gray);
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-lg);
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.tab-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.tab-btn:hover::before {
  left: 100%;
}

.tab-btn.active {
  background: var(--accent-red);
  border-color: var(--accent-red);
  box-shadow: var(--shadow-glow);
}

.tab-content {
  position: relative;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.solution-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.solution-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.solution-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-red);
}

.card-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-md);
  position: relative;
}

.military-icon,
.civilian-icon {
  width: 100%;
  height: 100%;
  border: 2px solid var(--glow-blue);
  border-radius: 50%;
  position: relative;
  background: radial-gradient(circle, rgba(0, 255, 255, 0.1), transparent);
}

.military-icon::before {
  content: '⚡';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2rem;
}

.civilian-icon::before {
  content: '📡';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2rem;
}

.solution-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: var(--spacing-sm);
  color: var(--white);
}

.solution-card p {
  color: var(--gray);
  line-height: 1.6;
}

/* 产品中心部分 */
.products-section {
  padding: var(--spacing-xl) 0;
  background: var(--dark-blue);
}

.product-categories {
  max-width: 1200px;
  margin: 0 auto;
}

.category-nav {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.category-btn {
  background: transparent;
  border: 2px solid var(--primary-blue);
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s ease;
}

.category-btn.active,
.category-btn:hover {
  background: var(--primary-blue);
  box-shadow: 0 0 15px rgba(0, 102, 204, 0.5);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.product-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all 0.3s ease;
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-red);
  box-shadow: var(--shadow-lg);
}

.product-card.selected {
  border-color: var(--accent-red);
  background: rgba(204, 51, 51, 0.1);
}

.product-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(45deg, rgba(0, 255, 255, 0.1), rgba(204, 51, 51, 0.1));
  border: 1px solid var(--glow-blue);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}

.product-info h4 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: var(--spacing-xs);
  color: var(--white);
}

.product-specs {
  list-style: none;
  margin: var(--spacing-sm) 0;
}

.product-specs li {
  font-size: 0.9rem;
  color: var(--gray);
  margin-bottom: var(--spacing-xs);
}



.product-compare {
  text-align: center;
}

.compare-btn {
  background: linear-gradient(45deg, var(--accent-red), var(--dark-red));
  border: none;
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 500;
  transition: all 0.3s ease;
  opacity: 0.5;
  pointer-events: none;
}

.compare-btn.active {
  opacity: 1;
  pointer-events: auto;
  box-shadow: var(--shadow-glow);
}

/* 技术优势部分 */
.advantages-section {
  padding: var(--spacing-xl) 0;
  background: linear-gradient(180deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
}

.advantage-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all 0.3s ease;
}

.advantage-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
  border-color: var(--glow-blue);
}

.advantage-visual {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--spacing-md);
  position: relative;
}

.signal-meter {
  width: 100%;
  height: 100%;
  border: 3px solid var(--glow-blue);
  border-radius: 50%;
  position: relative;
  background: radial-gradient(circle, rgba(0, 255, 255, 0.1), transparent);
}

.meter-display {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--glow-blue);
  text-shadow: 0 0 10px var(--glow-blue);
}

.speed-indicator {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.speed-bars {
  display: flex;
  gap: 4px;
  align-items: end;
}

.speed-bars span {
  width: 8px;
  background: var(--glow-blue);
  border-radius: 2px;
  animation: speedBars 1.5s ease-in-out infinite;
}

.speed-bars span:nth-child(1) { height: 20px; animation-delay: 0s; }
.speed-bars span:nth-child(2) { height: 35px; animation-delay: 0.1s; }
.speed-bars span:nth-child(3) { height: 50px; animation-delay: 0.2s; }
.speed-bars span:nth-child(4) { height: 35px; animation-delay: 0.3s; }
.speed-bars span:nth-child(5) { height: 20px; animation-delay: 0.4s; }

@keyframes speedBars {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

.speed-value {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--glow-blue);
  text-shadow: 0 0 10px var(--glow-blue);
}

.frequency-graph {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  border: 2px solid var(--glow-blue);
  border-radius: var(--radius-md);
  background: rgba(0, 255, 255, 0.05);
}

.graph-lines {
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(45deg, transparent 40%, var(--glow-blue) 50%, transparent 60%),
    linear-gradient(-45deg, transparent 40%, var(--glow-blue) 50%, transparent 60%);
  background-size: 20px 20px;
  animation: graphFlow 3s linear infinite;
}

@keyframes graphFlow {
  0% { background-position: 0 0, 0 0; }
  100% { background-position: 40px 40px, -40px 40px; }
}

.ai-processor {
  width: 100%;
  height: 100%;
  border: 2px solid var(--glow-blue);
  border-radius: var(--radius-md);
  position: relative;
  background: radial-gradient(circle, rgba(0, 255, 255, 0.1), transparent);
}

.processor-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 60%;
  height: 60%;
  transform: translate(-50%, -50%);
  border: 1px solid var(--glow-blue);
  border-radius: var(--radius-sm);
  background: linear-gradient(45deg, transparent, rgba(0, 255, 255, 0.2));
  animation: processorPulse 2s ease-in-out infinite;
}

@keyframes processorPulse {
  0%, 100% { box-shadow: 0 0 10px var(--glow-blue); }
  50% { box-shadow: 0 0 25px var(--glow-blue), inset 0 0 15px rgba(0, 255, 255, 0.3); }
}

.advantage-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: var(--spacing-sm);
  color: var(--white);
}

.advantage-card p {
  color: var(--gray);
  line-height: 1.6;
}

/* 功率转换器部分 */
.converter-section {
  padding: var(--spacing-xl) 0;
  background: linear-gradient(180deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
}

.converter-container {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.converter-input {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.conversion-group {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  backdrop-filter: blur(10px);
}

.conversion-group h3 {
  color: var(--glow-blue);
  margin-bottom: var(--spacing-md);
  font-size: 1.3rem;
  text-align: center;
  font-family: var(--font-display);
}

.input-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.input-group label {
  min-width: 80px;
  color: var(--light-gray);
  font-weight: 500;
}

.input-group input {
  flex: 1;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--glow-blue);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
  color: var(--white);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.input-group input:focus {
  outline: none;
  border-color: var(--glow-red);
  box-shadow: 0 0 10px var(--glow-red);
}

.input-group .unit {
  color: var(--glow-blue);
  font-weight: 600;
  min-width: 30px;
}

.result-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.result-group label {
  min-width: 80px;
  color: var(--light-gray);
  font-weight: 500;
}

.result-display {
  flex: 1;
  background: rgba(0, 255, 255, 0.2);
  border: 1px solid var(--glow-blue);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
  color: var(--glow-blue);
  font-weight: 600;
  font-size: 1.1rem;
  text-align: center;
  min-height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.converter-info {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  backdrop-filter: blur(10px);
}

.converter-info h4 {
  color: var(--glow-blue);
  margin-bottom: var(--spacing-md);
  font-size: 1.3rem;
  text-align: center;
  font-family: var(--font-display);
}

.formula-box {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--glow-blue);
  border-radius: var(--radius-sm);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.formula-box p {
  color: var(--light-gray);
  margin-bottom: var(--spacing-xs);
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
}

.formula-box strong {
  color: var(--glow-blue);
}

.common-values h5 {
  color: var(--glow-blue);
  margin-bottom: var(--spacing-sm);
  font-size: 1.1rem;
}

.conversion-table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.conversion-table th,
.conversion-table td {
  padding: var(--spacing-sm);
  text-align: center;
  border-bottom: 1px solid var(--glow-blue);
}

.conversion-table th {
  background: rgba(0, 255, 255, 0.2);
  color: var(--glow-blue);
  font-weight: 600;
}

.conversion-table td {
  color: var(--light-gray);
}

.conversion-table tr:hover {
  background: rgba(0, 255, 255, 0.1);
}

/* 联系我们部分 */
.contact-section {
  padding: var(--spacing-xl) 0;
  background: var(--dark-blue);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  max-width: 1000px;
  margin: 0 auto;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.info-icon {
  font-size: 1.5rem;
  width: 40px;
  text-align: center;
}

.info-content h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
  color: var(--white);
}

.info-content p {
  color: var(--gray);
}

.contact-form {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--gray);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.1);
  color: var(--white);
  font-size: 1rem;
  font-family: var(--font-body);
}

.form-group textarea {
  resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--glow-blue);
  box-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
}

.submit-btn {
  width: 100%;
  background: linear-gradient(45deg, var(--primary-blue), var(--light-blue));
  border: none;
  color: var(--white);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.submit-btn:hover {
  box-shadow: 0 0 15px rgba(0, 102, 204, 0.5);
  transform: translateY(-2px);
}

/* 页脚 */
.footer {
  background: var(--primary-blue);
  border-top: 2px solid var(--accent-red);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: var(--spacing-md);
  color: var(--white);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-xs);
}

.footer-section a {
  color: var(--gray);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section a:hover {
  color: var(--white);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.footer-logo img {
  width: 30px;
  height: 30px;
}

.footer-logo span {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer-links a {
  color: var(--gray);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

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

/* 模态框 */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  z-index: 2000;
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background: var(--primary-blue);
  border: 2px solid var(--accent-red);
  border-radius: var(--radius-lg);
  max-width: 400px;
  width: 90%;
  position: relative;
}

.modal-header {
  padding: var(--spacing-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-family: var(--font-display);
  color: var(--white);
  margin: 0;
}

.close-btn {
  background: transparent;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-body {
  padding: var(--spacing-md);
}

.military-form .form-group {
  margin-bottom: var(--spacing-md);
}

.access-btn {
  width: 100%;
  background: linear-gradient(45deg, var(--accent-red), var(--dark-red));
  border: none;
  color: var(--white);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.access-btn:hover {
  box-shadow: var(--shadow-glow);
}

/* 响应式设计 */
@media (max-width: 968px) {
  .nav-menu {
    display: none;
  }
  
  .nav-toggle {
    display: flex;
  }
  

  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .converter-container,
  .contact-content {
    grid-template-columns: 1fr;
  }
  
  .solution-cards {
    grid-template-columns: 1fr;
  }
  
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .category-nav {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .tab-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--dark-blue);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-red);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--dark-red);
}

/* 选择文本样式 */
::selection {
  background: var(--accent-red);
  color: var(--white);
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top: 2px solid var(--white);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}