/* ============================================
   上海闻天信息技术有限公司 - 官方网站样式
   支持多主题切换：绿色新能源 / 科技蓝 / 深空黑金
   ============================================ */

/* CSS变量定义 - 默认绿色新能源主题 */
:root {
  /* 主色调 */
  --color-primary: #059669;
  --color-primary-light: #10B981;
  --color-primary-dark: #047857;
  --color-secondary: #06B6D4;
  --color-accent: #34D399;
  
  /* 背景色 */
  --color-background: #FFFFFF;
  --color-background-alt: #F0FDF4;
  --color-background-dark: #064E3B;
  
  /* 文字色 */
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-text-white: #FFFFFF;
  
  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #059669 0%, #10B981 100%);
  --gradient-hero: linear-gradient(135deg, #064E3B 0%, #059669 50%, #10B981 100%);
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* 圆角 */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* 字体 */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --font-family-heading: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* 容器宽度 */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

/* 科技蓝主题 */
[data-theme="blue"] {
  --color-primary: #1E40AF;
  --color-primary-light: #3B82F6;
  --color-primary-dark: #1E3A8A;
  --color-secondary: #06B6D4;
  --color-accent: #60A5FA;
  --color-background-alt: #EFF6FF;
  --color-background-dark: #1E3A8A;
  --gradient-primary: linear-gradient(135deg, #1E40AF 0%, #3B82F6 100%);
  --gradient-hero: linear-gradient(135deg, #1E3A8A 0%, #1E40AF 50%, #3B82F6 100%);
}

/* 深空黑金主题 */
[data-theme="dark"] {
  --color-primary: #1F2937;
  --color-primary-light: #374151;
  --color-primary-dark: #111827;
  --color-secondary: #D97706;
  --color-accent: #F97316;
  --color-background-alt: #F3F4F6;
  --color-background-dark: #111827;
  --gradient-primary: linear-gradient(135deg, #1F2937 0%, #D97706 100%);
  --gradient-hero: linear-gradient(135deg, #111827 0%, #1F2937 50%, #D97706 100%);
}

/* ============================================
   基础样式重置
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family-base);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

ul, ol {
  list-style: none;
}

/* ============================================
   工具类
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.container-narrow {
  max-width: var(--container-lg);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-alt {
  background-color: var(--color-background-alt);
}

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

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   按钮样式
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  gap: 0.5rem;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--color-text-white);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-text-white);
}

.btn-white {
  background-color: var(--color-background);
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.btn-white:hover {
  background-color: var(--color-background-alt);
  color: var(--color-primary-dark);
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

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

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  display: block;
  max-height: 40px;
  width: auto;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: 0.5rem 0;
  /* 添加左边框作为焦点指示器 */
  border-left: 3px solid transparent;
  padding-left: 0.75rem;
  margin-left: -0.75rem;
  transition: all var(--transition-base);
}
/* 删除或注释掉以下下划线相关代码 */
/*
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}
*/
.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background-color: rgba(5, 150, 105, 0.05); /* 轻微背景色 */
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* 移动端菜单按钮修复 */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
  /* 确保按钮有固定尺寸，防止变换时收缩 */
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1001; /* 确保在菜单之上 */
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--color-text);
  border-radius: 3px;
  transition: all var(--transition-base);
  /* 设置变换原点为中心 */
  transform-origin: center;
}

/* 菜单按钮激活状态 - 修正版 */
.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(0, 8px); /* 调整平移值 */
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(0, -8px); /* 调整平移值 */
}

/* ============================================
   Hero区域（轮播图）
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
}

.hero-slider {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease;
}

.hero-slide.active {
  opacity: 1;
}

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, rgba(6, 78, 59, 0.9) 0%, rgba(6, 78, 59, 0.7) 50%, rgba(6, 78, 59, 0.4) 100%);
}

.hero-content {
  position: relative;
  z-index: 10;
  padding-top: 80px;
  color: var(--color-text-white);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  opacity: 0.9;
  margin-bottom: 2rem;
  max-width: 600px;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* 轮播指示器 */
.slider-dots {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.75rem;
  z-index: 20;
}

.slider-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.4);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

.slider-dot.active {
  background-color: white;
  transform: scale(1.2);
}

/* ============================================
   区块标题
   ============================================ */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.section-label::before,
.section-label::after {
  content: '';
  width: 30px;
  height: 2px;
  background: var(--gradient-primary);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   服务卡片
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.service-card {
  background-color: var(--color-background);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

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

.service-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: white;
  font-size: 1.75rem;
}

.service-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.service-description {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ============================================
   关于我们
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.about-image {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.about-image img {
  width: 100%;
  height: auto;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-md);
  background-color: var(--color-background);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: 0.25rem;
}

/* ============================================
   项目案例
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  background-color: var(--color-background);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.project-image {
  position: relative;
  height: 240px;
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card:hover .project-overlay {
  opacity: 0.9;
}

.project-content {
  padding: var(--spacing-lg);
}

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-client {
  font-size: 0.875rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.project-description {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ============================================
   资质证书
   ============================================ */
.certificates-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.certificate-item {
  background-color: var(--color-background);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  text-align: center;
}

.certificate-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.certificate-image {
  width: 100%;
  height: 280px;
  object-fit: contain;
  margin-bottom: 1rem;
  border-radius: var(--radius-md);
}

.certificate-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
}

/* ============================================
   客户展示
   ============================================ */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
}

.client-item {
  background-color: var(--color-background);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-light);
  transition: all var(--transition-base);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

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

/* ============================================
   联系方式
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
}

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

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: var(--spacing-md);
  background-color: var(--color-background);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.contact-details h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.contact-details p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background-color: var(--color-background-dark);
  color: var(--color-text-white);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.footer-logo img {
  display: block;
  max-height: 60px;
  width: auto;
  filter: brightness(1.1);
}

.footer-description {
  opacity: 0.8;
  line-height: 1.7;
  font-size: 0.95rem;
}

.footer-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: white;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  opacity: 0.7;
  font-size: 0.875rem;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .certificates-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar-container {
    height: 70px;
  }
  
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: 0;
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
	/* 确保菜单在按钮下方 */
    z-index: 999;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-link {
    padding: 0.625rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    /* 移动端使用左边框高亮 */
    border-left: 3px solid transparent;
    padding-left: 1rem;
    margin-left: 0;
    display: block; /* 确保点击区域完整 */
  }
  
  .nav-link:hover,
  .nav-link.active {
    border-left-color: var(--color-primary);
    background-color: rgba(5, 150, 105, 0.08);
    color: var(--color-primary);
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .about-stats {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-brand {
    max-width: 100%;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .logo img {
    max-height: 35px;
  }
}

@media (max-width: 480px) {
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .certificates-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   动画效果
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}

/* 滚动显示动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}