/* 
文件名称: welcome.css
完整存储路径: frontend/static/css/welcome.css
功能说明: 中医适宜技术防控青少年近视系统宣传页面样式
版本: 2.0.0
最后修改: 2025-01-27
*/

/* ===== 基础样式 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  overflow-x: hidden;
}

/* ===== 背景样式 ===== */
.background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  z-index: -2;
}

.stars {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(2px 2px at 20px 30px, #eee, transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
    radial-gradient(1px 1px at 90px 40px, #fff, transparent),
    radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.6), transparent),
    radial-gradient(2px 2px at 160px 30px, #ddd, transparent);
  background-repeat: repeat;
  background-size: 200px 100px;
  animation: starsAnimation 20s linear infinite;
  opacity: 0.3;
}

@keyframes starsAnimation {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-100px); }
}

/* ===== 顶部导航栏 ===== */
.top-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  z-index: 1000;
  padding: 15px 0;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo-section i {
  font-size: 2rem;
  color: #667eea;
}

.logo-section h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: #333;
  margin: 0;
}

.auth-buttons {
  display: flex;
  gap: 15px;
}

.btn-primary, .btn-secondary {
  padding: 10px 20px;
  border: none;
  border-radius: 25px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.9);
  color: #667eea;
  border: 2px solid #667eea;
}

.btn-secondary:hover {
  background: #667eea;
  color: white;
  transform: translateY(-2px);
}

/* ===== 主要内容区域 ===== */
.main-content {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 英雄区域 ===== */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  margin-bottom: 60px;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  color: white;
  margin-bottom: 20px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 40px;
  animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  margin-top: 40px;
  animation: fadeInUp 1s ease-out 0.4s both;
}

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

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: white;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.stat-label {
  display: block;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 5px;
}

/* ===== 技术特色区域 ===== */
.features-section {
  padding: 60px 0;
  background: rgba(255, 255, 255, 0.95);
  margin-bottom: 60px;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 50px;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 2px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.feature-card {
  background: white;
  padding: 40px 30px;
  border-radius: 15px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  border: 1px solid rgba(102, 126, 234, 0.1);
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon i {
  font-size: 2rem;
  color: white;
}

.feature-card h4 {
  font-size: 1.3rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 15px;
}

.feature-card p {
  color: #666;
  line-height: 1.6;
}

/* ===== 数据展示区域 ===== */
.data-section {
  padding: 60px 0;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  margin-bottom: 60px;
}

.data-section .section-title {
  color: white;
}

.chart-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.chart-wrapper {
  background: rgba(255, 255, 255, 0.95);
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* ===== 项目背景区域 ===== */
.project-section {
  padding: 60px 0;
  background: rgba(255, 255, 255, 0.95);
  margin-bottom: 60px;
}

.project-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.project-text h3 {
  font-size: 2rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 20px;
}

.project-text p {
  color: #666;
  line-height: 1.8;
  margin-bottom: 20px;
}

.project-image img {
  width: 100%;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* ===== 技术介绍区域 ===== */
.technique-section {
  padding: 60px 0;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  margin-bottom: 60px;
}

.technique-section .section-title {
  color: white;
}

.technique-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 40px;
}

.technique-method, .technique-mechanism {
  background: rgba(255, 255, 255, 0.95);
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.technique-method h4, .technique-mechanism h4 {
  font-size: 1.3rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.technique-method h4 i, .technique-mechanism h4 i {
  color: #667eea;
}

.technique-method p, .technique-mechanism p {
  color: #666;
  line-height: 1.8;
}

/* ===== 筛查要求区域 ===== */
.screening-section {
  padding: 60px 0;
  background: rgba(255, 255, 255, 0.95);
  margin-bottom: 60px;
}

.screening-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.screening-card {
  background: white;
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  border-left: 4px solid #667eea;
}

.screening-card h4 {
  font-size: 1.2rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.screening-card h4 i {
  color: #667eea;
}

.screening-card p {
  color: #666;
  line-height: 1.6;
}

/* ===== 模态框样式 ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.modal-content {
  background: white;
  border-radius: 15px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  width: 90%;
  max-width: 400px;
  animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-50px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  padding: 20px 30px;
  border-bottom: 1px solid #eee;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: #333;
  display: flex;
  align-items: center;
  gap: 10px;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: #999;
  cursor: pointer;
  padding: 5px;
  border-radius: 50%;
  transition: all 0.3s ease;
}

.close-btn:hover {
  background: #f5f5f5;
  color: #333;
}

.login-form, .register-form {
  padding: 30px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: #333;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-group input {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid #eee;
  border-radius: 8px;
  font-size: 14px;
  transition: all 0.3s ease;
}

.form-group input:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-actions {
  display: flex;
  gap: 15px;
  margin-top: 30px;
}

.form-actions button {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

/* ===== 警告消息样式 ===== */
.alert {
  position: fixed;
  top: 100px;
  right: 20px;
  background: #f8d7da;
  color: #721c24;
  padding: 15px 20px;
  border-radius: 8px;
  border: 1px solid #f5c6cb;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  z-index: 3000;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 15px;
  }
  
  .logo-section h1 {
    font-size: 1.2rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 30px;
  }
  
  .project-content,
  .technique-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .chart-container {
    grid-template-columns: 1fr;
  }
  
  .features-grid,
  .screening-grid {
    grid-template-columns: 1fr;
  }
  
  .auth-buttons {
    flex-direction: column;
    gap: 10px;
  }
  
  .btn-primary, .btn-secondary {
    width: 200px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }
  
  .hero-section {
    padding: 60px 0 40px;
  }
  
  .hero-title {
    font-size: 1.5rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .modal-content {
    width: 95%;
    margin: 20px;
  }
}