/* ========== 全局变量和基础样式 ========== */
:root {
  /* 色彩系统 */
  --primary: #4361ee;
  --primary-dark: #3f37c9;
  --primary-light: #f0f5ff;
  --secondary: #7209b7;
  --accent: #f72585;
  --text: #2b2d42;
  --text-light: #6c757d;
  --white: #ffffff;
  --gray-light: #f8f9fa;
  
  /* 阴影系统 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 15px 35px rgba(0,0,0,0.12);
  
  /* 间距系统 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 4rem;
  
  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  
  /* 过渡效果 */
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* 基础样式 */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background-color: var(--white);
  overflow-x: hidden;
}

.page-container {
  width: 100%;
  margin-bottom: 20px;
  padding: 0 0;
}

.hero-section {
  position: relative;
  height: 40vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
  margin-bottom: var(--space-l);
  overflow: hidden;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 2;
  padding: 0 var(--space-md);
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: var(--space-sm);
  line-height: 1.2;
  animation: fadeInUp 0.8s ease;
  text-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-light);
  margin: 0 auto;
  animation: fadeInUp 0.8s ease 0.2s forwards;
  opacity: 0;
  max-width: 600px;
}

.hero-decoration {
  position: absolute;
  width: 1200px;
  height: 1200px;
  background: radial-gradient(circle, rgba(67,97,238,0.08) 0%, rgba(67,97,238,0) 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  animation: pulse 15s infinite alternate;
}

/* 卡片样式 */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  position: relative;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

/* 章节标题 */
.section-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-xl);
}

.section-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-right: var(--space-md);
  opacity: 0.2;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin: 0;
  position: relative;
  line-height: 1.3;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 0;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px;
}

/* 内容区域 */
.content-section {
  padding: var(--space-xl) 0;
  position: relative;
  margin-bottom: 20px;
}

.content-body {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text);
}

/* 特性网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
}

/* 特性卡片 */
.feature-card {
  padding: var(--space-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
  z-index: 1;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 3.5rem;
  margin-bottom: var(--space-md);
  display: inline-block;
  transition: var(--transition);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1);
}

.feature-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: var(--space-sm);
}

.feature-desc {
  color: var(--text-light);
  line-height: 1.6;
}

.feature-hover-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(67,97,238,0.03), rgba(114,9,183,0.03));
  opacity: 0;
  transition: var(--transition);
  z-index: -1;
}

.feature-card:hover .feature-hover-bg {
  opacity: 1;
}

/* 列表样式 */
.terms-list {
  list-style: none;
  padding-left: var(--space-md);
  margin: var(--space-lg) 0;
}

.terms-list li {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

.list-icon {
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: bold;
  font-size: 1.2rem;
}

/* 页脚区域 */
.section-footer {
  padding: var(--space-lg) 0;
  text-align: center;
  color: var(--text-light);
  font-size: 0.95rem;
  border-top: 1px solid rgba(0,0,0,0.05);
  margin-top: var(--space-xl);
}

.dots-pattern {
  position: absolute;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(rgba(67,97,238,0.1) 1px, transparent 1px);
  background-size: 25px 25px;
  opacity: 0.3;
}

.about-mission {
  position: relative;
  padding: var(--space-xxl);
  background: var(--white);
  border-radius: var(--radius-lg);
}

.team-section {
  padding: var(--space-xxl);
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.thank-you {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  position: relative;
  text-align: center;
}

.thank-you::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.terms-intro {
  padding: var(--space-xl) var(--space-xl) var(--space-lg);
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.terms-section {
  padding: var(--space-xl);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  transition: var(--transition);
}

.terms-section:hover {
  background: var(--primary-light);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0% {
    transform: translate(-50%, -50%) scale(1);
  }
  100% {
    transform: translate(-50%, -50%) scale(1.1);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-25px);
  }
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 1200px) {
  .hero-title {
    font-size: 3.5rem;
  }
  
  .section-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 992px) {
  .hero-section {
    height: 30vh;
  }
  
  .about-mission,
  .team-section {
    padding: var(--space-xl);
  }
}

@media (max-width: 768px) {
  .hero-section {
    height: 30vh;
  }
  
  .hero-title {
    font-size: 2.8rem;
  }
  
  .hero-subtitle {
    font-size: 1.3rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .terms-list {
    padding-left: 0;
  }
}

/* 用户责任样式 */
.terms-section.user-responsibility .section-header {
  text-align: center;
}

.terms-section.user-responsibility .content-body {
  text-align: left;
  width: 90%;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.terms-section.user-responsibility .terms-list {
  text-align: left;
  padding-left: var(--space-lg);
  margin-left: 0;
}

.terms-section.user-responsibility .list-icon {
  left: var(--space-sm);
}

.privacy-section {
  margin-bottom: var(--space-xxl);
  padding: var(--space-xl);
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.privacy-section:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.privacy-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--primary), var(--secondary));
}

.privacy-heading {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.privacy-heading::before {
  content: '';
  width: 24px;
  height: 24px;
  background-color: var(--primary-light);
  border-radius: 50%;
  display: inline-block;
  border: 3px solid var(--primary);
}

.privacy-content {
  line-height: 1.8;
  color: var(--text);
  padding-left: calc(24px + var(--space-md));
}

.privacy-points {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.privacy-point {
  background: var(--primary-light);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: var(--transition);
  border-left: 3px solid var(--primary);
}

.privacy-point:hover {
  transform: translateY(-5px);
  background: var(--white);
  box-shadow: var(--shadow-md);
}

.privacy-icon {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: var(--space-sm);
  display: inline-block;
  transition: var(--transition);
}

.privacy-point:hover .privacy-icon {
  transform: scale(1.1);
}

.privacy-point-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: var(--space-xs);
}

.privacy-point-desc {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 列表样式 */
.privacy-list {
  margin: var(--space-lg) 0;
  padding-left: var(--space-md);
  text-align: left;
}

.privacy-list li {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
  line-height: 1.7;
  text-align: left;
  margin-left: 0;
  list-style-position: inside;
  text-indent: -0.7em;
}

.privacy-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 8px;
  background-color: var(--primary);
  border-radius: 50%;
}

.security-measures {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin: var(--space-xl) auto;
  justify-content: center;
  max-width: 800px;
}

.security-badge {
  background: var(--white);
  border-radius: 50px;
  padding: var(--space-sm) var(--space-lg);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--primary-light);
}

.security-badge:hover {
  background: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.security-badge:hover .badge-icon,
.security-badge:hover .badge-text {
  color: var(--white);
}

.badge-icon {
  font-size: 1.2rem;
  color: var(--primary);
  transition: var(--transition);
}

.badge-text {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--primary);
  transition: var(--transition);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .privacy-section {
    padding: var(--space-lg);
  }
  
  .privacy-points {
    grid-template-columns: 1fr;
  }
  
  .privacy-heading {
    font-size: 1.6rem;
  }
}

@media (max-width: 480px) {
  .privacy-section {
    padding: var(--space-md);
  }
  
  .privacy-heading {
    font-size: 1.4rem;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
  
  .privacy-content {
    padding-left: 0;
  }
}

@media (max-width: 576px) {
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .section-number {
    margin-right: var(--space-sm);
  }
  
  .about-mission,
  .team-section,
  .terms-section {
    padding: var(--space-lg);
  }
  
  .feature-card {
    padding: var(--space-lg);
  }
}

/* ========== 联系我们页面优化样式 ========== */
.contact-section {
  padding: var(--space-xxl) 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
}

.contact-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: var(--transition);
  height: 100%;
}

.contact-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.contact-card-body {
  padding: var(--space-xl);
}

.contact-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: var(--space-lg);
  position: relative;
  padding-bottom: var(--space-xs);
}

.contact-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.contact-form {
  margin-top: var(--space-lg);
  text-align: left;
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--text);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid #e0e0e0;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  transition: var(--transition);
  background: var(--white);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.submit-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.submit-button:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.contact-method {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  margin-bottom: 20px;
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  text-align: left;
}

.contact-method:hover {
  background: var(--primary-light);
}

.contact-icon {
  font-size: 1.8rem;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: var(--space-xs);
  width: 50px;
            height: 50px;
}

.contact-method-content {
  flex: 1;
}

.contact-method-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: var(--space-xs);
}

.contact-link {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
  display: inline-block;
}

.contact-link:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.contact-address {
  margin: 0;
  color: var(--text);
  line-height: 1.6;
}

.contact-hours {
  margin-top: var(--space-xxl);
  padding: var(--space-lg);
  background: var(--primary-light);
  border-radius: var(--radius-sm);
}

.hours-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: var(--space-sm);
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .contact-card-body {
    padding: var(--space-lg);
  }
}

@media (max-width: 576px) {
  .contact-section {
    padding: var(--space-xl) 0;
  }
  
  .contact-card-body {
    padding: var(--space-md);
  }
  
  .contact-method {
    flex-direction: column;
    gap: var(--space-sm);
  }
}