:root{--bg-primary:#fbfbfd;--bg-secondary:#f5f5f7;--text-primary:#1d1d1f;--text-secondary:#6e6e73;--text-tertiary:#86868b;--accent:#0071e3;--accent-hover:#0077ed;--accent-soft:#0071e314;--code-bg:#f0f0f0;--border:#d2d2d7;--border-soft:#e5e5ea;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;--font-mono:"SF Mono", ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Monaco, "Cascadia Code", Consolas, monospace;--measure:700px;--space-xs:8px;--space-sm:16px;--space-md:24px;--space-lg:48px;--space-xl:80px;--content-width:800px}:root.raining{--bg-primary:#1c1d22;--bg-secondary:#24252c;--text-primary:#f5f5f7;--text-secondary:#a6a8b0;--text-tertiary:#7d8087;--accent:#64a8ff;--accent-hover:#85bbff;--accent-soft:#64a8ff1f;--code-bg:#2a2b33;--border:#3a3b45;--border-soft:#2e2f38}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizelegibility}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.65;transition:background-color 1.8s,color 1.8s}h1,h2,h3,h4{letter-spacing:-.02em}.mono{font-family:var(--font-mono)}.eyebrow{font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--text-tertiary);font-size:12px;font-weight:500}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}button{font:inherit;cursor:pointer}ul,ol{list-style:none}.main-content{background:var(--bg-primary);z-index:1;min-height:calc(100vh - 200px);transition:background-color 1.8s;position:relative}.shell{max-width:var(--content-width);margin-inline:auto;padding-inline:24px}.link-external:after{content:"↗" / "";color:var(--text-tertiary);margin-left:3px;font-size:.85em}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}