/* ===================================
   全局样式文件 - 企业级网络技术服务展示网站
   配色：珍珠白(#F5F7FA) + 科技蓝(#2A6DFF)
   =================================== */

/* 导入字体 */
@import url('https://fonts.loli.net/css2?family=Inter:wght@300;400;500;600&display=swap');

/* Tailwind配置保护 */
@layer base {
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
}

/* 根变量定义 */
:root {
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #F5F7FA;
  --color-accent: #2A6DFF;
  --color-accent-hover: #1E4FCC;
  --color-text-primary: #1A202C;
  --color-text-secondary: #4A5568;
  --color-text-muted: #6C7A8E;
  --color-border: #E2E8F0;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
  --radius: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 全局基础样式 */
body {
  font-family: var(--font-sans);
  font-weight: 300;
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.navbar-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 400;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
  padding-bottom: 0.25rem;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.3s ease;
}

.nav-link:hover {
  color: var(--color-accent);
}

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

.nav-link.active {
  color: var(--color-accent);
  font-weight: 500;
}

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: var(--transition);
}

/* Hero区块样式 */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

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

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 2rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 300;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: 3rem;
  font-weight: 300;
}

.hero-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* 玻璃拟态按钮 */
.glass-button {
  padding: 1rem 2.5rem;
  background: rgba(42, 109, 255, 0.1);
  border: 1px solid rgba(42, 109, 255, 0.2);
  border-radius: var(--radius);
  color: var(--color-accent);
  font-size: 1rem;
  font-weight: 400;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.glass-button:hover {
  background: rgba(42, 109, 255, 0.2);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.glass-button.primary {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.glass-button.primary:hover {
  background: var(--color-accent-hover);
}

/* 卡片样式 */
.card {
  background: var(--color-bg-primary);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.card-icon {
  width: 60px;
  height: 60px;
  margin-bottom: 1.5rem;
  color: var(--color-accent);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.card-description {
  color: var(--color-text-secondary);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* 区块容器 */
.section {
  padding: 6rem 2rem;
  max-width: 1280px;
  margin: 0 auto;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 400;
  text-align: center;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  margin-bottom: 4rem;
}

/* 网格布局 */
.grid {
  display: grid;
  gap: 2rem;
}

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

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

/* 服务网格（非对称） */
.service-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.service-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.service-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.service-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.service-content {
  padding: 2rem;
  background: var(--color-bg-primary);
}

.service-title {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.service-features {
  list-style: none;
  color: var(--color-text-secondary);
}

.service-features li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
}

.service-features li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* 时间轴样式 */
.timeline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  margin: 4rem 0;
  padding: 0 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 2rem;
  right: 2rem;
  height: 2px;
  background: var(--color-border);
  transform: translateY(-50%);
}

.timeline-item {
  position: relative;
  text-align: center;
  z-index: 2;
}

.timeline-node {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-bg-primary);
  border: 3px solid var(--color-accent);
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  cursor: pointer;
}

.timeline-node:hover {
  transform: scale(1.3);
  box-shadow: 0 0 0 8px rgba(42, 109, 255, 0.1);
}

.timeline-label {
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* 滤镜按钮 */
.filter-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.75rem 2rem;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
}

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

/* 案例卡片 */
.case-card {
  background: var(--color-bg-primary);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.case-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
}

.case-content {
  padding: 2rem;
}

.case-title {
  font-size: 1.35rem;
  font-weight: 500;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.case-description {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 圆形进度条 */
.metrics {
  display: flex;
  justify-content: center;
  gap: 4rem;
  margin: 4rem 0;
  flex-wrap: wrap;
}

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

.progress-ring {
  width: 120px;
  height: 120px;
  margin: 0 auto 1rem;
  position: relative;
}

.progress-ring svg {
  transform: rotate(-90deg);
}

.progress-ring-circle {
  fill: none;
  stroke: var(--color-border);
  stroke-width: 8;
}

.progress-ring-circle-fill {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s ease;
}

.progress-label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--color-accent);
}

.metric-text {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* 关于页面布局 */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin: 4rem 0;
}

.about-text h2 {
  font-size: 2rem;
  font-weight: 400;
  margin-bottom: 1.5rem;
  color: var(--color-text-primary);
}

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

.about-image {
  border-radius: var(--radius);
  width: 100%;
  height: 400px;
  object-fit: cover;
  box-shadow: var(--shadow-md);
}

/* 技术栈图标云 */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  margin: 4rem 0;
}

.tech-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  filter: grayscale(100%);
  opacity: 0.7;
}

.tech-icon:hover {
  filter: grayscale(0%);
  opacity: 1;
  transform: scale(1.1);
  box-shadow: var(--shadow-md);
}

.tech-icon img {
  width: 50px;
  height: 50px;
  object-fit: contain;
}

/* 页脚样式 */
.footer {
  background: var(--color-bg-primary);
  border-top: 1px solid var(--color-border);
  padding: 2rem;
  text-align: center;
  margin-top: 6rem;
}

.footer-text {
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 300;
}

/* Canvas装饰 */
.canvas-decoration {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 200px;
  pointer-events: none;
  z-index: 0;
}

/* 响应式设计 - 平板 */
@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .service-grid {
    grid-template-columns: 1fr;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .timeline {
    flex-direction: column;
    gap: 2rem;
  }
  
  .timeline::before {
    display: none;
  }
  
  .metrics {
    gap: 2rem;
  }
}

/* 响应式设计 - 移动端 */
@media (max-width: 768px) {
  .navbar-container {
    padding: 1rem;
  }
  
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    height: 100vh;
    width: 70%;
    max-width: 300px;
    background: var(--color-bg-primary);
    flex-direction: column;
    padding: 6rem 2rem 2rem;
    gap: 1.5rem;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
    transition: right 0.3s ease;
  }
  
  .nav-links.active {
    right: 0;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .section {
    padding: 4rem 1rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }
  
  .filter-buttons {
    flex-direction: column;
  }
  
  .metrics {
    flex-direction: column;
    gap: 2rem;
  }
  
  .tech-stack {
    gap: 1rem;
  }
  
  .tech-icon {
    width: 60px;
    height: 60px;
  }
  
  .tech-icon img {
    width: 35px;
    height: 35px;
  }
}

/* 辅助类 */
.hidden {
  display: none;
}

.fade-in {
  animation: fadeIn 0.6s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}