:root {
  --primary-color: #409EFF;
  --primary-dark: #337ecc;
  --secondary-color: #667eea;
  --accent-color: #764ba2;
  --bg-color: #f0f2f5;
  --card-bg: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-light: #999999;
  --border-color: #e4e7ed;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-color);
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(64, 158, 255, 0.05) 0%, transparent 20%),
    radial-gradient(circle at 80% 30%, rgba(118, 75, 162, 0.05) 0%, transparent 25%),
    radial-gradient(circle at 40% 70%, rgba(102, 126, 234, 0.05) 0%, transparent 20%),
    radial-gradient(circle at 90% 90%, rgba(64, 158, 255, 0.05) 0%, transparent 15%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

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

/* 导航栏样式 */
.navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-brand img {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.navbar-nav a {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.navbar-nav a:hover,
.navbar-nav a.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

/* 页脚样式 */
.footer {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 40px 0 20px;
  margin-top: 60px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 30px;
}

.footer-section h3 {
  font-size: 18px;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 14px;
  line-height: 2;
  display: block;
}

.footer-section a:hover {
  color: white;
  text-decoration: underline;
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
}

/* 页脚移动端适配 */
@media (max-width: 768px) {
  .footer {
    padding: 30px 0 16px;
    margin-top: 40px;
  }

  /* 隐藏"关于我们"和"工具分类"区块，只保留核心链接 */
  .footer-section:nth-child(1),
  .footer-section:nth-child(3) {
    display: none;
  }

  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
    padding: 0 16px;
  }

  .footer-section h3 {
    font-size: 16px;
    margin-bottom: 12px;
  }

  .footer-section p,
  .footer-section a {
    font-size: 13px;
    line-height: 1.8;
  }

  /* 热门工具只显示前4个 */
  .footer-section:nth-child(2) a:nth-child(n+5) {
    display: none;
  }

  /* 隐藏广告披露 */
  .footer-bottom > div[style*="margin-bottom"] {
    display: none;
  }

  .footer-bottom {
    font-size: 12px;
    padding-top: 16px;
  }
}

@media (max-width: 480px) {
  .footer {
    padding: 24px 0 12px;
    margin-top: 30px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 20px;
    padding: 0 12px;
  }

  .footer-section h3 {
    font-size: 15px;
    margin-bottom: 10px;
  }

  .footer-section p,
  .footer-section a {
    font-size: 12px;
    line-height: 1.7;
  }

  /* 小屏只显示前3个工具链接 */
  .footer-section:nth-child(2) a:nth-child(n+4) {
    display: none;
  }

  .footer-bottom {
    font-size: 11px;
    padding-top: 12px;
  }
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 500;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(64, 158, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(64, 158, 255, 0.4);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-success {
  background: linear-gradient(135deg, #67c23a 0%, #85ce61 100%);
  color: white;
}

.btn-danger {
  background: linear-gradient(135deg, #f56c6c 0%, #f78989 100%);
  color: white;
}

/* 卡片样式 */
.card {
  background: var(--card-bg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  padding: 24px;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

/* 表单样式 */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background: var(--card-bg);
  color: var(--text-primary);
  transition: var(--transition);
  outline: none;
  font-family: inherit;
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(64, 158, 255, 0.1);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

select.form-control {
  cursor: pointer;
}

/* 文本区域 */
.textarea-wrapper {
  position: relative;
}

.textarea-wrapper textarea {
  width: 100%;
  min-height: 200px;
  padding: 16px;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.6;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background: #fafafa;
  color: var(--text-primary);
  resize: vertical;
  outline: none;
  transition: var(--transition);
}

.textarea-wrapper textarea:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(64, 158, 255, 0.1);
}

/* 提示消息 */
.toast {
  position: fixed;
  top: 80px;
  right: 20px;
  padding: 14px 24px;
  border-radius: var(--border-radius);
  color: white;
  font-size: 14px;
  font-weight: 500;
  z-index: 9999;
  animation: slideInRight 0.3s ease, fadeOut 0.3s ease 2.7s;
  box-shadow: var(--shadow-lg);
}

.toast-success {
  background: linear-gradient(135deg, #67c23a 0%, #85ce61 100%);
}

.toast-error {
  background: linear-gradient(135deg, #f56c6c 0%, #f78989 100%);
}

.toast-info {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

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

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

/* 工具页面通用样式 */
.tool-header {
  text-align: center;
  margin-bottom: 32px;
}

.tool-header h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tool-header p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.tool-content {
  background: var(--card-bg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  padding: 32px;
}

.input-section,
.output-section {
  margin-bottom: 24px;
}

.input-section h3,
.output-section h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.action-buttons {
  display: flex;
  gap: 12px;
  margin: 24px 0;
  flex-wrap: wrap;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--secondary-color), var(--accent-color));
}

/* 移动端菜单遮罩 */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: -280px;
  width: 280px;
  height: 100vh;
  background: white;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  transition: right 0.3s ease;
  overflow-y: auto;
  padding: 20px;
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu-overlay.active {
  display: block;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }

  .container {
    padding: 0 16px;
  }

  .tool-header h1 {
    font-size: 24px;
  }

  .tool-content {
    padding: 20px;
  }

  .action-buttons {
    flex-direction: column;
  }

  .action-buttons .btn {
    width: 100%;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 480px) {
  .navbar-brand {
    font-size: 16px;
  }

  .tool-header h1 {
    font-size: 20px;
  }

  .card {
    padding: 16px;
  }
}