* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: system-ui, -apple-system, sans-serif;
}
body {
  background: #f5f7fa;
  color: #333;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 头部 */
.header {
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  color: white;
  padding: 60px 0 40px;
  text-align: center;
}
.header h1 {
  font-size: 36px;
  margin-bottom: 10px;
}
.header p {
  font-size: 16px;
  opacity: 0.9;
}
.admin-btn {
  display: inline-block;
  margin-top: 20px;
  padding: 8px 16px;
  background: rgba(255,255,255,0.2);
  color: white;
  border-radius: 6px;
  text-decoration: none;
}

/* 搜索 */
.search-box {
  margin: 30px 0;
  text-align: center;
}
.search-box input {
  width: 100%;
  max-width: 600px;
  padding: 14px 20px;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  font-size: 16px;
  outline: none;
}

/* 分类 */
.category {
  margin-bottom: 40px;
}
.cat-title {
  font-size: 20px;
  margin: 30px 0 15px;
  color: #1e293b;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.tool-card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  transition: 0.2s;
  text-decoration: none;
  color: inherit;
}
.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.tool-logo {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  margin-bottom: 10px;
  object-fit: cover;
}
.tool-name {
  font-weight: 600;
  margin-bottom: 6px;
}
.tool-desc {
  font-size: 13px;
  color: #64748b;
}

/* 登录 */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.login-box {
  background: white;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  width: 100%;
  max-width: 400px;
}
.login-box h2 {
  margin-bottom: 20px;
  text-align: center;
}
.login-box input {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 14px;
  border: 1px solid #ddd;
  border-radius: 8px;
}
.login-box button {
  width: 100%;
  padding: 12px;
  background: #4f46e5;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}
#msg {
  margin-top: 10px;
  color: red;
  text-align: center;
}

/* 后台 */
.admin-body {
  padding: 40px 20px;
}
.admin-container {
  max-width: 900px;
  margin: 0 auto;
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 2px 15px rgba(0,0,0,0.05);
}
.add-form {
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.add-form input {
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
}
.add-form button {
  padding: 10px;
  background: #4f46e5;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
.admin-item {
  padding: 12px;
  border-bottom: 1px solid #eee;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.admin-item button {
  background: #ef4444;
  color: white;
  border: none;
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
}

footer {
  text-align: center;
  padding: 30px 0;
  color: #999;
  font-size: 14px;
}

/* 移动端适配 */
@media (max-width: 768px) {
  /* 头部适配 */
  .header {
    padding: 40px 0 30px;
  }
  .header h1 {
    font-size: 28px;
  }
  .header p {
    font-size: 14px;
  }
  
  /* 搜索框适配 */
  .search-box input {
    padding: 12px 16px;
    font-size: 14px;
  }
  
  /* 工具网格适配 */
  .tool-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
  }
  .tool-card {
    padding: 15px;
  }
  .tool-name {
    font-size: 14px;
  }
  .tool-desc {
    font-size: 12px;
  }
  
  /* 登录页面适配 */
  .login-box {
    padding: 30px 20px;
    margin: 0 20px;
  }
  
  /* 后台管理适配 */
  .admin-body {
    padding: 20px 10px;
  }
  .admin-container {
    padding: 20px;
  }
  .add-form {
    gap: 8px;
  }
  .admin-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .admin-item button {
    align-self: flex-end;
  }
  
  /* 页脚适配 */
  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: 10px;
  }
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
  }
  
  /* 留言区域适配 */
  .message-form {
    gap: 10px;
  }
  .message-form input,
  .message-form textarea {
    font-size: 14px;
  }
  
  /* 广告区域适配 */
  .ad-section {
    margin: 20px 0;
    padding: 15px;
  }
  .ad-content {
    padding: 15px;
  }
  
  /* 设置页面适配 */
  .settings-container {
    padding: 20px;
    margin: 0 10px;
  }
  .settings-nav {
    flex-wrap: wrap;
    gap: 10px;
  }
  .settings-nav button {
    padding: 8px 15px;
    font-size: 14px;
  }
}

/* 小屏幕手机适配 */
@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }
  
  .header h1 {
    font-size: 24px;
  }
  
  .tool-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 10px;
  }
  
  .tool-card {
    padding: 12px;
  }
  
  .cat-title {
    font-size: 18px;
    margin: 20px 0 10px;
  }
  
  .message-section {
    padding: 15px;
  }
  
  .ad-section {
    padding: 12px;
  }
  
  .admin-container {
    padding: 15px;
  }
  
  .settings-container {
    padding: 15px;
  }
}

/* 平板横屏适配 */
@media (min-width: 769px) and (max-width: 1024px) {
  .tool-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
  
  .container {
    max-width: 900px;
  }
}

/* 响应式字体大小 */
@media (max-width: 768px) {
  h1 {
    font-size: clamp(1.5rem, 5vw, 2rem);
  }
  h2 {
    font-size: clamp(1.25rem, 4vw, 1.5rem);
  }
  h3 {
    font-size: clamp(1.125rem, 3.5vw, 1.25rem);
  }
  p {
    font-size: clamp(0.875rem, 3vw, 1rem);
  }
}

/* 触摸反馈优化 */
@media (hover: none) and (pointer: coarse) {
  .tool-card:active {
    transform: translateY(-2px);
    background-color: #f8fafc;
  }
  
  button:active {
    transform: scale(0.98);
  }
  
  .admin-btn:active {
    background: rgba(255,255,255,0.3);
  }
}

/* 滚动条优化 */
@media (max-width: 768px) {
  ::-webkit-scrollbar {
    width: 4px;
  }
  
  ::-webkit-scrollbar-track {
    background: #f1f1f1;
  }
  
  ::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 2px;
  }
}