/* ========================================
   Web 开发工具箱 - 公共样式
   ======================================== */

/* CSS 变量 */
:root {
  /* 颜色 */
  --color-bg: #f5f7fa;
  --color-bg-card: #ffffff;
  --color-text-primary: #1d2129;
  --color-text-secondary: #86909c;
  --color-text-tertiary: #c9cdd4;
  --color-border: #e5e6eb;
  --color-accent: #4080ff;
  --color-accent-light: rgba(64, 128, 255, 0.1);

  /* 间距 */
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.1);

  /* 字体 */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;

  /* 动画 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* 重置样式 */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  color: var(--color-text-primary);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ========================================
   背景效果
   ======================================== */
.page-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  background: linear-gradient(135deg, #f3f4f6 0%, #fafbfc 50%, #f8f9fa 100%);
}

/* 柔和光晕效果 - 极低饱和度 */
.glow-effect {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: -1;
}

.glow-left {
  width: 800px;
  height: 800px;
  background: rgba(229, 231, 235, 0.8);
  top: -200px;
  left: -200px;
  opacity: 0.6;
}

.glow-right {
  width: 900px;
  height: 900px;
  background: rgba(209, 213, 219, 0.6);
  bottom: -300px;
  right: -300px;
  opacity: 0.5;
}

.glow-center {
  width: 1000px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(160, 175, 200, 0.5) 0%, rgba(140, 160, 190, 0.3) 50%, transparent 100%);
  top: 30%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 1;
}

/* 额外的淡色云雾层 */
.glow-effect.glow-mist {
  width: 1200px;
  height: 800px;
  background: radial-gradient(ellipse, rgba(150, 165, 190, 0.45) 0%, transparent 70%);
  top: 50%;
  left: 30%;
  transform: translate(-50%, -50%);
  opacity: 1;
  filter: blur(100px);
}

/* 粒子背景 - 雪花飘落效果 */
.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.particle {
  position: absolute;
  top: -20px;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 50%;
  opacity: 0;
  animation: snowfall linear infinite;
  box-shadow: 0 0 4px rgba(255, 255, 255, 0.5);
}

/* 不同大小的粒子 */
.particle.small {
  width: 4px;
  height: 4px;
}

.particle.medium {
  width: 6px;
  height: 6px;
}

.particle.large {
  width: 8px;
  height: 8px;
}

/* 雪花飘落动画 */
@keyframes snowfall {
  0% {
    transform: translateY(0) translateX(0) rotate(0deg);
    opacity: 0;
  }

  5% {
    opacity: 0.8;
  }

  25% {
    transform: translateY(25vh) translateX(15px) rotate(90deg);
  }

  50% {
    transform: translateY(50vh) translateX(-10px) rotate(180deg);
  }

  75% {
    transform: translateY(75vh) translateX(20px) rotate(270deg);
  }

  95% {
    opacity: 0.6;
  }

  100% {
    transform: translateY(100vh) translateX(5px) rotate(360deg);
    opacity: 0;
  }
}

/* ========================================
   布局容器
   ======================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding: var(--spacing-xxl) 0;
}

/* ========================================
   头部区域
   ======================================== */
.page-header {
  text-align: center;
  padding: var(--spacing-xxl) 0 var(--spacing-xl);
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ========================================
   卡片组件
   ======================================== */
.card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal);
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

/* 工具卡片 */
.tool-card {
  display: block;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-xl);
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal);
  cursor: pointer;
}

.tool-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.tool-card-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, #f0f5ff 0%, #e8f4ff 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
}

.tool-card-icon svg {
  width: 32px;
  height: 32px;
  color: var(--color-accent);
}

.tool-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.tool-card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 占位卡片 */
.tool-card.placeholder {
  background: linear-gradient(135deg, #fafbfc 0%, #f5f7fa 100%);
  border: 2px dashed var(--color-border);
  cursor: default;
}

.tool-card.placeholder:hover {
  transform: none;
  box-shadow: var(--shadow-md);
}

.tool-card.placeholder .tool-card-icon {
  background: #f0f1f3;
}

.tool-card.placeholder .tool-card-icon svg {
  color: var(--color-text-tertiary);
}

/* ========================================
   按钮
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--color-text-primary);
  color: #fff;
}

.btn-primary:hover {
  background: #000;
}

.btn-secondary {
  background: #f2f3f5;
  color: var(--color-text-primary);
}

.btn-secondary:hover {
  background: #e5e6eb;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
}

.btn-back:hover {
  background: #fff;
  color: var(--color-text-primary);
}

.btn-back svg {
  width: 16px;
  height: 16px;
}

/* ========================================
   工具页面布局
   ======================================== */
.tool-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md) var(--spacing-lg);
  z-index: 100;
}

.tool-main {
  padding-top: 80px;
}

.tool-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.tool-title-section {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.tool-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.tool-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

/* ========================================
   表单控件
   ======================================== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.form-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  transition: border-color var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-accent);
}

/* 开关 */
.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  background: #e5e6eb;
  border-radius: 12px;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.toggle.active {
  background: var(--color-accent);
}

.toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--transition-fast);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.toggle.active::after {
  transform: translateX(20px);
}

/* 滑块 */
.slider-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.slider {
  flex: 1;
  -webkit-appearance: none;
  height: 6px;
  background: #e5e6eb;
  border-radius: 3px;
  outline: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
}

.slider-value {
  min-width: 40px;
  text-align: center;
  font-weight: 600;
  color: var(--color-text-primary);
}

/* ========================================
   上传区域
   ======================================== */
.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xxl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: rgba(255, 255, 255, 0.5);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

.upload-zone-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  color: var(--color-text-tertiary);
}

.upload-zone-text {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.upload-zone-hint {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

/* ========================================
   页脚
   ======================================== */
.page-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  padding: var(--spacing-md) 0;
  color: var(--color-text-tertiary);
  font-size: 0.75rem;
  background: linear-gradient(to bottom, transparent, rgba(255, 255, 255, 0.9));
  pointer-events: none;
  z-index: 100;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

  .page-title {
    font-size: 1.75rem;
  }

  .page-subtitle {
    font-size: 1rem;
  }

  .tool-card {
    padding: var(--spacing-lg);
  }

  .tool-card-icon {
    width: 48px;
    height: 48px;
  }

  .tool-card-icon svg {
    width: 24px;
    height: 24px;
  }

  .tool-card-title {
    font-size: 1.125rem;
  }
}

/* ========================================
   工具类
   ======================================== */
.text-center {
  text-align: center;
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}