/* 
 * 博蓝优 - 专业外贸网站建设与谷歌SEO优化服务
 * 主样式表
 */

/* 基础样式 */
:root {
  --primary-color: #c0392b;
  --primary-light: #e74c3c;
  --primary-dark: #962d22;
  --secondary-color: #2c3e50;
  --secondary-light: #34495e;
  --secondary-dark: #1a252f;
  --accent-color: #f39c12;
  --text-color: #333333;
  --text-light: #666666;
  --bg-color: #ffffff;
  --bg-light: #f8f9fa;
  --bg-dark: #eeeeee;
  --border-radius: 5px;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
  --max-width: 1200px;
  --section-padding: 80px 0;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  color: var(--text-color);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

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

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

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

ul {
  list-style: none;
}

.container {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 15px;
}

/* 按钮样式 */
.btn-primary, .btn-secondary {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--border-radius);
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  color: white;
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

/* 标题样式 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
  color: var(--secondary-color);
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 0.5rem;
  position: relative;
}

.section-subtitle {
  font-size: 1.1rem;
  text-align: center;
  color: var(--text-light);
  margin-bottom: 3rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* 头部导航 */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: white;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 15px 0;
  transition: var(--transition);
}

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

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

.logo a {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo span {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-color);
}

nav .menu {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

nav .menu a {
  font-weight: 500;
  color: var(--secondary-color);
  padding: 5px;
  position: relative;
}

nav .menu a:not(.btn-primary)::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: var(--primary-color);
  transition: var(--transition);
}

nav .menu a:not(.btn-primary):hover::after {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 24px;
  position: relative;
}

.mobile-menu-toggle span {
  display: block;
  position: absolute;
  height: 3px;
  width: 100%;
  background: var(--primary-color);
  border-radius: 3px;
  transition: var(--transition);
}

.mobile-menu-toggle span:nth-child(1) {
  top: 0;
}

.mobile-menu-toggle span:nth-child(2) {
  top: 10px;
}

.mobile-menu-toggle span:nth-child(3) {
  top: 20px;
}

/* 英雄部分 */
.hero {
  padding: 160px 0 100px;
  background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-dark) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: rgba(192, 57, 43, 0.1);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -50px;
  left: -50px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(192, 57, 43, 0.05);
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  color: var(--secondary-dark);
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  color: var(--text-light);
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

/* 服务部分 */
.services {
  padding: var(--section-padding);
  background-color: var(--bg-color);
}

.service-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 3rem;
}

.service-card {
  background-color: var(--bg-light);
  border-radius: var(--border-radius);
  padding: 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-top: 4px solid var(--primary-color);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.service-icon {
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

.service-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.service-card p {
  margin-bottom: 1.5rem;
  color: var(--text-light);
}

.service-card ul li {
  margin-bottom: 0.5rem;
  position: relative;
  padding-left: 1.5rem;
}

.service-card ul li::before {
  content: "✓";
  color: var(--primary-color);
  position: absolute;
  left: 0;
}

/* 优势部分 */
.advantages {
  padding: var(--section-padding);
  background-color: var(--bg-light);
  position: relative;
  overflow: hidden;
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
}

.advantage-item {
  text-align: center;
  padding: 30px 20px;
  background-color: var(--bg-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.advantage-item:hover {
  transform: translateY(-5px);
}

.advantage-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  padding: 15px;
  border-radius: 50%;
  background-color: rgba(192, 57, 43, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
}

.advantage-item h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

/* 流程部分 */
.process {
  padding: var(--section-padding);
  background-color: var(--bg-color);
}

.process-steps {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  counter-reset: step-counter;
}

.process-step {
  flex: 1;
  min-width: 200px;
  max-width: 300px;
  text-align: center;
  padding: 30px 20px;
  background-color: var(--bg-light);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  position: relative;
}

.step-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.process-step h3 {
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

/* 案例部分 */
.cases {
  padding: var(--section-padding);
  background-color: var(--bg-light);
}

.case-studies {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.case-study {
  background-color: var(--bg-color);
  padding: 30px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.case-study:hover {
  transform: translateY(-5px);
}

.case-icon {
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

.case-study h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

/* 联系部分 */
.contact {
  padding: var(--section-padding);
  background-color: var(--bg-color);
}

.contact-content {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 40px;
}

.contact-form {
  background-color: var(--bg-light);
  padding: 40px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  margin-bottom: 0;
}

.form-group.full-width {
  grid-column: span 2;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: 500;
  color: var(--secondary-color);
}

input, textarea {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(192, 57, 43, 0.2);
}

.contact-info {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.contact-method {
  margin-bottom: 2rem;
}

.contact-method h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.contact-logo {
  text-align: center;
  margin-top: auto;
}

.contact-logo img {
  margin-bottom: 1rem;
}

/* 页脚 */
footer {
  background-color: var(--secondary-dark);
  color: white;
  padding: 60px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-logo h3 {
  color: white;
  font-size: 1.5rem;
  margin: 1rem 0;
}

.footer-logo p {
  color: rgba(255, 255, 255, 0.7);
}

.footer-links h4, .footer-services h4, .footer-contact h4 {
  color: white;
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
}

.footer-links ul, .footer-services ul {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition);
}

.footer-links a:hover {
  color: white;
  padding-left: 5px;
}

.footer-services ul li {
  color: rgba(255, 255, 255, 0.7);
}

.footer-contact p {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 0.5rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.5);
}

/* 响应式样式 */
@media (max-width: 992px) {
  .section-title {
    font-size: 2.2rem;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
    z-index: 1010;
  }
  
  nav .menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: white;
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
    transition: var(--transition);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    padding: 80px 40px;
    z-index: 1000;
  }
  
  nav .menu.active {
    right: 0;
  }
  
  .mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg);
    top: 10px;
  }
  
  .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg);
    top: 10px;
  }
  
  .hero {
    padding: 140px 0 80px;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: 1rem;
  }
  
  .process-steps {
    flex-direction: column;
    align-items: center;
  }
  
  .process-step {
    width: 100%;
    max-width: 400px;
  }
  
  form {
    grid-template-columns: 1fr;
  }
  
  .form-group.full-width {
    grid-column: span 1;
  }
}

@media (max-width: 480px) {
  .section-title {
    font-size: 1.8rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .service-cards, .advantage-grid, .case-studies {
    grid-template-columns: 1fr;
  }
}