/* ===== 极光渐变配色 ===== */
:root {
  --bg-deep: #0a0a1a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-input: rgba(255, 255, 255, 0.05);
  --text-primary: #e8e8f0;
  --text-secondary: rgba(255, 255, 255, 0.5);
  --gradient-1: #667eea;
  --gradient-2: #764ba2;
  --gradient-3: #f64f59;
  --gradient-4: #12c2e9;
  --glow-purple: rgba(118, 75, 162, 0.4);
  --glow-blue: rgba(102, 126, 234, 0.4);
  --glow-pink: rgba(246, 79, 89, 0.3);
  --border-color: rgba(255, 255, 255, 0.08);
  --icon-bg-1: rgba(255, 255, 255, 0.1);
  --icon-bg-2: rgba(255, 255, 255, 0.02);
  --card-shadow: rgba(0, 0, 0, 0.3);
  --stars-opacity: 0.6;
  --radius: 20px;
  --radius-sm: 12px;
  --transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

:root[data-theme='light'] {
  --bg-deep: #f3f6ff;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-card-hover: rgba(255, 255, 255, 0.92);
  --bg-input: rgba(102, 126, 234, 0.1);
  --text-primary: #1e2433;
  --text-secondary: rgba(30, 36, 51, 0.62);
  --glow-purple: rgba(118, 75, 162, 0.18);
  --glow-blue: rgba(102, 126, 234, 0.18);
  --glow-pink: rgba(246, 79, 89, 0.14);
  --border-color: rgba(103, 122, 170, 0.24);
  --icon-bg-1: rgba(102, 126, 234, 0.14);
  --icon-bg-2: rgba(118, 75, 162, 0.08);
  --card-shadow: rgba(67, 87, 133, 0.18);
  --stars-opacity: 0.25;
}

/* ===== 基础重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ===== 背景与主体 ===== */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* 极光背景效果 */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse 80% 50% at 20% 40%, var(--glow-purple), transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 20%, var(--glow-blue), transparent 50%),
    radial-gradient(ellipse 50% 30% at 60% 80%, var(--glow-pink), transparent 50%);
  animation: aurora 20s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: -1;
}

@keyframes aurora {
  0% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(-5%, 5%) rotate(3deg); }
  100% { transform: translate(5%, -5%) rotate(-3deg); }
}

/* 星星点点效果 */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(2px 2px at 20px 30px, rgba(255,255,255,0.3), transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.2), transparent),
    radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.4), transparent),
    radial-gradient(2px 2px at 130px 80px, rgba(255,255,255,0.2), transparent),
    radial-gradient(1px 1px at 160px 120px, rgba(255,255,255,0.3), transparent);
  background-size: 200px 200px;
  pointer-events: none;
  z-index: -1;
  opacity: var(--stars-opacity);
}

/* ===== 头部 ===== */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 32px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 20px;
}

.back-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  transition: all var(--transition);
}

.back-btn:hover {
  color: var(--text-primary);
  border-color: var(--gradient-1);
  box-shadow: 0 0 20px var(--glow-blue);
}

.header h1 {
  font-size: 1.3rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--gradient-4), var(--gradient-1), var(--gradient-2));
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 8s ease infinite;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* ===== 主容器 ===== */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 48px 24px;
}

/* ===== 工具卡片网格 ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.tool-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius);
  padding: 28px;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 14px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

/* 渐变边框效果 */
.tool-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  padding: 1px;
  background: linear-gradient(135deg,
    rgba(102, 126, 234, 0.3),
    rgba(118, 75, 162, 0.1),
    rgba(246, 79, 89, 0.3));
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition);
}

.tool-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px) scale(1.02);
  border-color: transparent;
  box-shadow:
    0 20px 40px var(--card-shadow),
    0 0 60px var(--glow-purple),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-card .icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--icon-bg-1), var(--icon-bg-2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  border: 1px solid var(--border-color);
  transition: all var(--transition);
}

.tool-card:hover .icon {
  background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
  border-color: transparent;
  box-shadow: 0 8px 20px var(--glow-purple);
}

.tool-card .name {
  font-weight: 600;
  font-size: 1.05rem;
  transition: all var(--transition);
}

.tool-card:hover .name {
  background: linear-gradient(90deg, var(--gradient-4), var(--gradient-1));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tool-card .desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ===== 工具页面布局 ===== */
.tool-content {
  padding: 32px 24px;
  max-width: 700px;
  margin: 0 auto;
}

/* ===== 标签页切换 ===== */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
  padding: 6px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  padding: 14px 24px;
  background: transparent;
  border: none;
  border-radius: calc(var(--radius) - 4px);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-input);
}

.tab-btn.active {
  color: #fff;
  background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
  box-shadow: 0 4px 15px var(--glow-purple);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ===== 输入区域 ===== */
.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: block;
  margin-bottom: 10px;
  font-weight: 500;
  font-size: 14px;
  color: var(--text-secondary);
}

.input-group input,
.input-group textarea,
.input-group select {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text-primary);
  font-size: 14px;
  transition: all var(--transition);
}

.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
  outline: none;
  border-color: var(--gradient-1);
  box-shadow: 0 0 20px var(--glow-blue);
}

.input-group textarea {
  min-height: 120px;
  resize: vertical;
  font-family: inherit;
}

.input-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23888' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

.input-group input[type="range"] {
  padding: 0;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-input);
  -webkit-appearance: none;
}

.input-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
  cursor: pointer;
  box-shadow: 0 2px 10px var(--glow-purple);
}

.input-row {
  display: flex;
  gap: 16px;
}

.input-row .input-group {
  flex: 1;
}

/* ===== 文件上传区 ===== */
.drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--gradient-1);
  background: var(--bg-card-hover);
  box-shadow: 0 0 40px var(--glow-blue);
}

.drop-zone .icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.drop-zone .text {
  color: var(--text-secondary);
  font-size: 14px;
}

.drop-zone .text span {
  background: linear-gradient(90deg, var(--gradient-4), var(--gradient-1));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 500;
}

.drop-zone input[type="file"] {
  display: none;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
  color: #fff;
  box-shadow: 0 4px 15px var(--glow-purple);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--glow-purple);
}

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

.btn-secondary:hover {
  border-color: var(--gradient-1);
  box-shadow: 0 0 20px var(--glow-blue);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn-group {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

/* ===== 结果展示 ===== */
.result {
  margin-top: 28px;
  padding: 24px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.result-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
}

.result-content {
  word-break: break-all;
  font-family: 'SF Mono', Monaco, 'Courier New', monospace;
  font-size: 14px;
  padding: 16px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.result img {
  max-width: 100%;
  border-radius: var(--radius-sm);
}

/* ===== 预览网格 ===== */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.preview-item {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
  transition: all var(--transition);
}

.preview-item:hover {
  border-color: var(--gradient-1);
  box-shadow: 0 0 20px var(--glow-blue);
}

.preview-item img {
  max-width: 100%;
  max-height: 100px;
  object-fit: contain;
  margin-bottom: 10px;
  border-radius: 8px;
}

.preview-item .name {
  font-size: 12px;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.preview-item .size {
  font-size: 11px;
  color: var(--text-secondary);
  opacity: 0.7;
  margin-top: 4px;
}

/* ===== 提示信息 ===== */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
  color: #fff;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 1000;
  box-shadow: 0 8px 30px var(--glow-purple);
}

.toast.show {
  opacity: 1;
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .header {
    padding: 16px 20px;
  }

  .header h1 {
    font-size: 1.1rem;
  }

  .container {
    padding: 32px 16px;
  }

  .tool-content {
    padding: 24px 16px;
  }

  .tools-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .tool-card {
    padding: 20px;
    flex-direction: row;
    text-align: left;
  }

  .tool-card .icon {
    width: 52px;
    height: 52px;
    font-size: 24px;
  }

  .input-row {
    flex-direction: column;
    gap: 0;
  }

  .btn-group {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .tabs {
    flex-direction: column;
    gap: 4px;
  }

  .preview-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== 光标拖尾效果 ===== */
.cursor-trail {
  position: fixed;
  pointer-events: none;
  border-radius: 50%;
  z-index: 9999;
  mix-blend-mode: screen;
}

/* ===== 点击粒子效果 ===== */
.click-particle {
  position: fixed;
  pointer-events: none;
  border-radius: 50%;
  z-index: 9998;
}

/* 点击波纹效果 */
.click-ripple {
  position: fixed;
  pointer-events: none;
  border-radius: 50%;
  border: 2px solid;
  z-index: 9997;
  animation: ripple-expand 0.6s ease-out forwards;
}

@keyframes ripple-expand {
  0% {
    transform: translate(-50%, -50%) scale(0);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0;
  }
}

/* 移动端隐藏光标效果 */
@media (hover: none) and (pointer: coarse) {
  .cursor-trail,
  .click-particle,
  .click-ripple {
    display: none !important;
  }
}

/* ===== 减少动画（用户偏好） ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}