:root{--bg-primary:#fff;--bg-secondary:#f1f1f1;--bg-card:#fdfcf8;--bg-nav:#fff;--bg-hero:linear-gradient(135deg,#ecf5ff,#f0f2f5);--bg-image-color:#00000012;--text-primary:#1a1a1a;--text-secondary:#2c3e50;--text-muted:#3d3e40;--text-light:#606266;--border-color:#e4e7ed;--shadow-color:#0000000f;--link-color:#007dff;--link-hover:#66b1ff;--font-size-base:1rem}.dark-mode{--bg-primary:#1a1a2e;--bg-secondary:#444;--bg-card:#1d1d1d;--bg-nav:#0f0f1a;--bg-hero:linear-gradient(135deg,#1a1a2e,#16213e);--bg-image-color:#ffffff12;--text-primary:#e8e8e8;--text-secondary:#c8d0e0;--text-muted:#b2b9bf;--text-light:#9ba2a8;--border-color:#2a3a5e;--shadow-color:#0000004d;--link-color:#66b1ff;--link-hover:#409eff}[data-font-size=small]{--font-size-base:.9rem}[data-font-size=medium]{--font-size-base:1rem}[data-font-size=large]{--font-size-base:1.2rem}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-secondary);color:var(--text-secondary);font-family:-apple-system,PingFang SC,Microsoft YaHei,sans-serif;font-size:var(--font-size-base);transition:background .3s,color .3s}.container{max-width:1200px;margin:0 auto}.mongolian-mode body{writing-mode:vertical-lr;-webkit-writing-mode:vertical-lr;text-orientation:sideways}