:root{--bg:#fff;--surface:#fff;--surface-alt:#f5f5f7;--surface-hover:#ededf2;--border:#d2d2d7;--border-hover:#b8b8be;--text:#1d1d1f;--text-secondary:rgba(0,0,0,.8);--text-tertiary:rgba(0,0,0,.56);--text-disabled:rgba(0,0,0,.36);--accent:#0071e3;--accent-hover:#0077ed;--accent-strong:#0068d1;--accent-soft:#e8f1fd;--link:#06c;--error:#d95c4a;--bg-rgb:255,255,255;--accent-rgb:0,113,227;--color-accent:var(--accent);--color-text:var(--text);--color-text-sub:#86868b;--color-bg:var(--bg);--color-bg-soft:var(--surface-alt);--color-line:#e8e8ed;--gutter:clamp(20px,5vw,64px);--radius:12px;--maxw:1200px;--font-sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Inter","Helvetica Neue","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;--font-mono:ui-monospace,SFMono-Regular,Menlo,monospace}*{margin:0;padding:0;box-sizing:border-box}body,html{background:var(--bg);color:var(--text);font-family:var(--font-sans);-webkit-font-smoothing:antialiased}a{color:var(--link);text-decoration:none}a:hover{color:var(--accent)}.btn-ghost,.btn-primary{font:500 16px/1 var(--font-sans);padding:11px 22px;border-radius:980px;cursor:pointer;text-decoration:none;display:inline-block;border:1px solid transparent;transition:background .25s,color .25s,transform .15s,border-color .25s}.btn-primary{color:#fff;background:var(--accent)}.btn-primary:hover{color:#fff;background:var(--accent-hover)}.btn-primary:active{transform:scale(.97)}.btn-ghost{color:var(--accent);border-color:var(--accent);background:none}.btn-ghost:hover{background:var(--accent-soft)}.btn--sm{font-size:14px;padding:9px 18px}