/* 拟态风格基础样式 */
:root {
  --bg-color: #e0e5ec;
  --primary-color: #0284c7;
  --accent-color: #f687b3;
  --shadow-light: #ffffff;
  --shadow-dark: #a3b1c6;
}

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

body {
  background-color: var(--bg-color);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
}

/* 凸起效果 */
.neu-raised {
  background: var(--bg-color);
  box-shadow: 6px 6px 12px var(--shadow-dark),
              -6px -6px 12px var(--shadow-light);
  border-radius: 12px;
  border: none;
  transition: all 0.3s ease;
}

/* 凹陷效果 */
.neu-pressed {
  background: var(--bg-color);
  box-shadow: inset 4px 4px 8px var(--shadow-dark),
              inset -4px -4px 8px var(--shadow-light);
  border-radius: 12px;
}

/* 拟态按钮 */
.neu-btn {
  background: var(--bg-color);
  box-shadow: 6px 6px 12px var(--shadow-dark),
              -6px -6px 12px var(--shadow-light);
  border-radius: 12px;
  border: none;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--primary-color);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.neu-btn:hover {
  box-shadow: 8px 8px 16px var(--shadow-dark),
              -8px -8px 16px var(--shadow-light);
  transform: translateY(-1px);
}

.neu-btn:active {
  box-shadow: inset 2px 2px 4px var(--shadow-dark),
              inset -2px -2px 4px var(--shadow-light);
  transform: translateY(0);
}

.neu-btn-primary {
  color: var(--primary-color);
}

.neu-btn-accent {
  color: var(--accent-color);
}

/* 柔和按钮 - 用于Hero区域，阴影更微妙 */
.neu-btn-soft {
  background: var(--bg-color);
  box-shadow: 3px 3px 6px var(--shadow-dark),
              -3px -3px 6px var(--shadow-light);
  border-radius: 12px;
  border: none;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--primary-color);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.neu-btn-soft:hover {
  box-shadow: 4px 4px 8px var(--shadow-dark),
              -4px -4px 8px var(--shadow-light);
  transform: translateY(-1px);
}

.neu-btn-soft:active {
  box-shadow: inset 2px 2px 4px var(--shadow-dark),
              inset -2px -2px 4px var(--shadow-light);
  transform: translateY(0);
}

/* 拟态卡片 */
.neu-card {
  background: var(--bg-color);
  box-shadow: 6px 6px 12px var(--shadow-dark),
              -6px -6px 12px var(--shadow-light);
  border-radius: 16px;
  padding: 24px;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}

.neu-card:hover {
  box-shadow: 8px 8px 16px var(--shadow-dark),
              -8px -8px 16px var(--shadow-light);
  transform: translateY(-2px);
}

/* 拟态输入框 */
.neu-input {
  background: var(--bg-color);
  box-shadow: inset 3px 3px 6px var(--shadow-dark),
              inset -3px -3px 6px var(--shadow-light);
  border-radius: 8px;
  border: none;
  padding: 12px 16px;
  font-size: 14px;
  color: #333;
  outline: none;
  transition: all 0.3s ease;
  width: 100%;
}

.neu-input:focus {
  box-shadow: inset 4px 4px 8px var(--shadow-dark),
              inset -4px -4px 8px var(--shadow-light);
}

/* 拟态图标容器 */
.neu-icon {
  box-shadow: 3px 3px 6px var(--shadow-dark),
              -3px -3px 6px var(--shadow-light);
  border-radius: 50%;
  padding: 8px;
  display: inline-block;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .neu-btn {
    padding: 10px 20px;
    font-size: 14px;
  }

  .neu-card {
    padding: 16px;
  }
}

@media (max-width: 640px) {
  .neu-raised,
  .neu-card {
    box-shadow: 4px 4px 8px var(--shadow-dark),
                -4px -4px 8px var(--shadow-light);
  }

  .neu-btn:active {
    box-shadow: inset 2px 2px 4px var(--shadow-dark),
                inset -2px -2px 4px var(--shadow-light);
  }
}

/* 图片懒加载优化 */
@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

img.lazy-loading {
    min-height: 200px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

img.lazy-loaded {
    animation: fadeIn 0.3s ease-in;
}

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

img.lazy-error {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    text-align: center;
}