:root{--font-sans-en:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--font-sans-zh:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","WenQuanYi Micro Hei",sans-serif;--color-bg:#0c0f14;--color-surface:#161b24;--color-border:#2a3142;--color-text:#e6e9ef;--color-text-muted:#8b92a4;--color-accent:#7eb8da;--color-accent-hover:#9ccce8;--color-cta:#5cb88a;--color-cta-hover:#6ec99a;--radius:10px;--shadow:0 4px 24px rgba(0,0,0,.35)}*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden;font-family:var(--font-sans-en);background:var(--color-bg);color:var(--color-text);line-height:1.6}.zh,[lang=zh-CN]{font-family:var(--font-sans-zh)}a{color:var(--color-accent);text-decoration:none}a:hover{color:var(--color-accent-hover);text-decoration:underline}button{cursor:pointer}button,input,select,textarea{font-family:inherit}