:root{color-scheme:light;--marketing-max:62rem;--marketing-gutter:clamp(1rem,2.5vw,1.5rem);--bg:#ffffff;--bg-canvas:#ffffff;--bg-subtle:#fafafa;--surface:#ffffff;--hover:#f5f5f5;--border:#ebebeb;--text:#0d0d0d;--text-secondary:#5d5d5d;--muted:#8e8e8e;--accent:#0d0d0d;--error:#a16207;--radius:12px;--radius-sm:8px;--radius-xl:22px;--border-subtle:#f0f0f0;--shadow-soft:0 4px 14px rgba(0,0,0,0.08);--shadow-lift:0 18px 40px rgba(0,0,0,0.08);--font-sans:var(--font-latin),var(--font-noto-sc),"PingFang SC","Hiragino Sans GB","Microsoft YaHei UI","Microsoft YaHei",sans-serif;--content-max:48rem;--rail-w:16rem;--header-h:3rem;--text-base:16px;--leading-body:1.75;--leading-tight:1.55}*,:after,:before{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font-sans);font-size:var(--text-base);font-weight:400;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;font-optical-sizing:auto}:lang(zh),:lang(zh-CN),body{line-height:var(--leading-body)}:lang(zh),:lang(zh-CN){letter-spacing:.01em}:lang(en){letter-spacing:-.015em;line-height:1.62}button,input,textarea{font:inherit}button{cursor:pointer}@keyframes fadeUp{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}@keyframes blink{50%{opacity:0}}