/**
 * 通用样式
 */

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  color: #333;
  background-color: #f5f5f5;
}

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

/* 导航栏 */
.navbar {
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

.nav-brand a {
  font-size: 1.5rem;
  font-weight: bold;
  color: #409eff;
  text-decoration: none;
}

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

.nav-menu a {
  color: #333;
  text-decoration: none;
  transition: color 0.3s;
}

.nav-menu a:hover {
  color: #409eff;
}

/* 按钮 */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  font-size: 1rem;
  transition: all 0.3s;
  text-align: center;
}

.btn-primary {
  background-color: #409eff;
  color: #fff;
}

.btn-primary:hover {
  background-color: #66b1ff;
}

.btn-secondary {
  background-color: #67c23a;
  color: #fff;
}

.btn-secondary:hover {
  background-color: #85ce61;
}

.btn-link {
  background: transparent;
  color: #409eff;
  padding: 0.5rem 1rem;
}

.btn-link:hover {
  background-color: #ecf5ff;
}

/* Hero 区域 */
.hero {
  text-align: center;
  padding: 4rem 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  margin: 2rem 0;
  border-radius: 8px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

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

/* 功能卡片 */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.feature-card {
  background: #fff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  text-align: center;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: #409eff;
}

.feature-card p {
  color: #666;
  margin-bottom: 1.5rem;
}

/* 表单样式 */
.form-container {
  max-width: 500px;
  margin: 3rem auto;
  background: #fff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: #333;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #dcdfe6;
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: #409eff;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

/* 消息提示 */
.message {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 1rem 1.5rem;
  border-radius: 4px;
  color: #fff;
  z-index: 10000;
  animation: slideIn 0.3s;
}

.message-info {
  background-color: #409eff;
}

.message-success {
  background-color: #67c23a;
}

.message-error {
  background-color: #f56c6c;
}

.message-warning {
  background-color: #e6a23c;
}

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

/* 加载状态 */
.loading {
  text-align: center;
  padding: 2rem;
  color: #666;
}

/* Footer */
.footer {
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 2rem 0;
  margin-top: 4rem;
}

/* 响应式 */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .nav-menu {
    flex-direction: column;
    gap: 0.5rem;
  }

  .features {
    grid-template-columns: 1fr;
  }
}