/* ============================
   图学堂 - 基础样式
   版本：v1.0
   说明：全局重置、排版、链接
   ============================ */

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

/* 基础 body */
body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 图片最大宽度限制 */
img {
    max-width: 100%;
    height: auto;
}

/* 链接基本样式 */
a {
    color: inherit;
    text-decoration: none;
}

/* 省电模式：减少动画 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================
   全局修复：html 背景 + Footer 定位
   ============================ */

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

.site-footer {
    margin-top: auto;
    width: 100%;
    display: flex;
    justify-content: center;
}