/* ========== 全局样式重置 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #2d3436;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  min-height: 100vh;
}

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

/* ========== 通用动画 ========== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ========== 通用类 ========== */
.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.slide-in {
  animation: slideIn 0.6s ease-out;
}

.scale-in {
  animation: scaleIn 0.6s ease-out;
}

.float {
  animation: float 3s ease-in-out infinite;
}

/* ========== 按钮样式 ========== */
.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  padding: 12px 30px;
  border-radius: 25px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-primary:active {
  transform: translateY(0);
}

/* ========== 卡片阴影 ========== */
.card-shadow {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.card-shadow:hover {
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
  transform: translateY(-5px);
}

/* ========== 渐变背景 ========== */
.gradient-bg {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.gradient-text {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========== 玻璃拟态 ========== */
.glass {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* ========== 加载动画 ========== */
.loading-shimmer {
  background: linear-gradient(
    90deg,
    #f0f0f0 0%,
    #e0e0e0 20%,
    #f0f0f0 40%,
    #f0f0f0 100%
  );
  background-size: 1000px 100%;
  animation: shimmer 2s infinite;
}

/* ========== 标签样式 ========== */
.tag-gradient {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

/* ========== 输入框美化 ========== */
.input-modern {
  width: 100%;
  padding: 12px 20px;
  border: 2px solid #e0e0e0;
  border-radius: 12px;
  font-size: 16px;
  transition: all 0.3s ease;
  background: white;
}

.input-modern:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* ========== 分割线 ========== */
.divider-gradient {
  height: 2px;
  border: none;
  background: linear-gradient(90deg, #667eea 0%, #764ba2 50%, #667eea 100%);
  background-size: 200% 100%;
  animation: shimmer 3s infinite;
}

/* ========== 响应式断点 ========== */
@media (max-width: 768px) {
  body {
    font-size: 14px;
  }
  
  .btn-primary {
    padding: 10px 20px;
    font-size: 14px;
  }
}

/* ========== 暗黑模式支持 ========== */
@media (prefers-color-scheme: dark) {
  body {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #e0e0e0;
  }
  
  .input-modern {
    background: #2d2d44;
    border-color: #404060;
    color: #e0e0e0;
  }
  
  .input-modern:focus {
    border-color: #667eea;
  }
}