:root{--ink:#202b38;--muted:#536171;--blue:#234e78;--line:#dce1e6;--surface:#f5f7f9;--bg:#fff;--control-bg:#fff;--selection:#dbe8f4;color-scheme:light;--mono:"SFMono-Regular",Consolas,monospace;color:var(--ink);background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif;font-size:16px;line-height:1.65}:root[data-theme=dark]{--ink:#edf2f7;--muted:#b4c0cc;--blue:#8db9e3;--line:#3b4958;--surface:#1b2632;--bg:#111a24;--control-bg:#202d3a;--selection:#294866;color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{background:var(--bg);margin:0;transition:background-color .2s,color .2s}::selection{background:var(--selection)}a{color:inherit;text-decoration:none}a:hover{color:var(--blue);text-underline-offset:4px;text-decoration:underline}a:focus-visible{outline-offset:5px;outline:3px solid #2868aa}.skip-link{color:var(--ink);background:var(--control-bg);z-index:2;padding:12px;position:absolute;top:-100px;left:20px}.skip-link:focus{top:12px}.shell{width:min(1160px,100% - 64px);margin-inline:auto}h1,h2,h3,p{margin-top:0}h1,h2{text-wrap:balance}h1{letter-spacing:-.045em;max-width:560px;margin-bottom:24px;font-size:clamp(2.8rem,4.5vw,4.25rem);font-weight:600;line-height:1.08}h2{letter-spacing:-.03em;margin-bottom:22px;font-size:clamp(1.8rem,2.8vw,2.5rem);font-weight:600;line-height:1.2}h3{line-height:1.3}.site-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:24px;min-height:88px;display:flex}.wordmark{letter-spacing:-.03em;align-items:center;gap:12px;font-size:19px;font-weight:650;display:flex}.wordmark-mark,.closing-mark{background:var(--blue);color:#fff;width:34px;height:34px;font:15px var(--mono);place-items:center;display:inline-grid}.site-header nav{align-items:center;gap:28px;font-size:14px;display:flex}.site-header nav a{padding-block:10px}.nav-github{border-left:1px solid var(--line);padding-left:28px}.theme-control{color:var(--muted);align-items:center;gap:8px;margin-left:auto;font-size:12px;display:flex}.theme-control label{font-weight:600}.theme-control select{border:1px solid var(--line);min-height:34px;color:var(--ink);background:var(--control-bg);font:inherit;cursor:pointer;border-radius:3px;padding:5px 28px 5px 10px}.theme-control select:focus-visible{outline-offset:2px;outline:3px solid #2868aa}.theme-control span{white-space:nowrap;font-size:11px}.hero{grid-template-columns:1fr 1fr;align-items:center;gap:72px;padding-block:80px 88px;display:grid}.stamp,.section-marker{color:var(--blue);letter-spacing:.08em;text-transform:uppercase;margin-bottom:24px;font-size:12px;font-weight:600}.hero-lede{max-width:470px;color:var(--muted);margin-bottom:30px;font-size:18px}.hero-actions{flex-wrap:wrap;align-items:center;gap:20px;display:flex}.button{border:1px solid var(--blue);border-radius:3px;justify-content:center;align-items:center;gap:16px;min-height:46px;padding:12px 18px;font-size:14px;font-weight:600;line-height:1.4;display:inline-flex}.button-primary{color:var(--bg);background:var(--blue)}.button-primary:hover{color:#fff;background:#173b60;text-decoration:none}.button-light{color:var(--blue);background:var(--control-bg)}.button-light:hover{background:#e8eef4;text-decoration:none}.text-link{color:var(--blue);align-items:center;gap:10px;font-size:14px;font-weight:600;display:inline-flex}.hero-footnote{border-top:1px solid var(--line);max-width:450px;color:var(--muted);gap:16px;margin-top:38px;padding-top:18px;font-size:12px;display:flex}.hero-footnote span:first-child{font-family:var(--mono)}.proof-sheet{border:1px solid var(--line);background:var(--surface);border-radius:4px;overflow:hidden}.sheet-topline,.sheet-bottom{background:var(--surface);color:var(--muted);flex-wrap:wrap;justify-content:space-between;gap:8px 16px;padding:15px 24px;font-size:11px;display:flex}.sheet-topline{border-bottom:1px solid var(--line)}.sheet-topline>span:first-child{color:var(--ink);font-size:12px;font-weight:600}.sheet-content{padding:24px}.sheet-label{text-transform:uppercase;letter-spacing:.05em;justify-content:space-between;gap:12px;margin-bottom:12px;font-size:12px;font-weight:600;display:flex}.sheet-label span{color:var(--muted);text-transform:none;letter-spacing:0;font-weight:400}.old-copy{color:var(--muted);margin-bottom:22px;font-size:14px;line-height:1.7}.after-label{border-top:1px solid var(--line);color:var(--blue);padding-top:20px}.new-copy{margin:0 0 20px;padding-left:22px;font-size:14px}.new-copy li{margin-bottom:8px;padding-left:5px}.new-copy li::marker{color:var(--blue);font-weight:600}.new-copy b{font-size:12px}.proof-note{color:var(--muted);gap:10px;font-size:12px;display:flex}.note-pin{color:var(--blue)}.sheet-bottom{border-top:1px solid var(--line);font-family:var(--mono);font-size:10px}.manifesto{border-top:1px solid var(--line);grid-template-columns:200px 1fr;gap:48px;padding-block:64px 80px;display:grid}.manifesto-lede{max-width:740px;color:var(--muted);margin-bottom:36px;font-size:18px}.principles{grid-template-columns:repeat(3,1fr);gap:28px;display:grid}.principle{border-top:1px solid var(--line);padding-top:18px}.principle span{color:var(--muted);font:12px var(--mono);margin-bottom:14px;display:block}.principle strong{margin-bottom:10px;font-size:15px;font-weight:600;line-height:1.5;display:block}.principle p{color:var(--muted);margin-bottom:0;font-size:14px}.levels-section{background:var(--surface);border-block:1px solid var(--line);padding-block:72px}.section-heading{grid-template-columns:200px 1fr 1fr;gap:48px;margin-bottom:36px;display:grid}.section-heading h2{margin-bottom:0}.section-heading p{color:var(--muted);margin-bottom:0;font-size:15px}.levels-rail{border-top:1px solid var(--line);grid-template-columns:repeat(3,1fr);display:grid}.level{padding:26px 28px 0 0}.level+.level{border-left:1px solid var(--line);padding-left:28px}.level-number{color:var(--blue);font:12px var(--mono);margin-bottom:20px}.level h3{margin-bottom:12px;font-size:20px;font-weight:600}.level p{max-width:300px;color:var(--muted);font-size:15px}.level-rules{color:var(--muted);font:12px var(--mono)}.rules-section{grid-template-columns:1fr 1fr;gap:100px;padding-block:80px;display:grid}.rules-intro p{max-width:420px;color:var(--muted)}.rule-index{border-top:1px solid var(--line)}.rule-row{border-bottom:1px solid var(--line);grid-template-columns:1fr auto 20px;align-items:center;gap:20px;min-height:52px;padding-inline:12px;font-size:14px;display:grid}.rule-row:hover{background:var(--surface)}.rule-row b{color:var(--muted);font:12px var(--mono)}.tool-section{background:var(--surface);border-block:1px solid var(--line)}.tool-layout{grid-template-columns:.9fr 1.1fr;align-items:center;gap:64px;padding-block:72px;display:grid}.tool-copy>p{color:var(--muted)}.tool-stats{flex-wrap:wrap;gap:24px;margin-block:28px;display:flex}.tool-stats span{color:var(--muted);flex-direction:column;gap:6px;font-size:12px;display:flex}.tool-stats strong{color:var(--ink);font-size:25px;font-weight:500;line-height:1.2}.terminal{color:#e3e9ef;background:#202b38;border-radius:4px;min-width:0;overflow:hidden}.terminal-bar{color:#c0ccd7;font:11px var(--mono);border-bottom:1px solid #46515d;justify-content:space-between;gap:16px;padding:16px 22px;display:flex}.terminal-body{font:12px/1.85 var(--mono);overflow-wrap:anywhere;padding:24px}.terminal-body p{margin-bottom:20px}.terminal-body p:last-child{margin-bottom:0}.terminal-prompt,.terminal-success{color:#b2d9c5}.terminal-muted{color:#b0bdca}.terminal-error b{color:#f4c791}.terminal-line u{text-underline-offset:4px}.terminal-fix{color:#c7dcef}.closing{grid-template-columns:48px 1fr 1fr;gap:32px;padding-block:72px;display:grid}.closing-mark{width:40px;height:40px}.closing h2{max-width:380px;margin-bottom:0}.closing-actions p{color:var(--muted)}.closing-actions .text-link{width:fit-content;margin-top:18px;display:flex}.site-footer{border-top:1px solid var(--line);color:var(--muted);grid-template-columns:1fr auto;gap:20px;padding-block:28px;font-size:12px;display:grid}.site-footer .wordmark-mark{vertical-align:middle;width:24px;height:24px;margin-right:8px;font-size:11px}.footer-links{flex-wrap:wrap;gap:12px 24px;display:flex}.site-footer p{grid-column:1/-1;margin:0;font-size:11px}@media (width<=1000px){.hero{gap:36px}.hero-actions{flex-direction:column;align-items:flex-start}.manifesto{grid-template-columns:140px 1fr;gap:32px}.section-heading{grid-template-columns:1fr 1fr;gap:24px}.section-heading .section-marker{grid-column:1/-1;margin:0}.rules-section,.tool-layout{gap:40px}.site-footer{grid-template-columns:1fr}}@media (width<=720px){.shell{width:calc(100% - 40px)}.site-header{flex-direction:column;align-items:flex-start;gap:8px;padding-block:18px 12px}.site-header nav{flex-wrap:wrap;gap:20px;width:100%;font-size:13px}.nav-github{border:0;margin-left:auto;padding-left:0}.hero,.manifesto,.section-heading,.rules-section,.tool-layout,.closing{grid-template-columns:1fr;gap:32px}.hero,.manifesto,.rules-section,.tool-layout,.closing{padding-block:48px}.hero-actions{flex-direction:row;align-items:center}.hero-lede,.manifesto-lede{font-size:17px}.section-marker{margin-bottom:18px}.manifesto>.section-marker{margin-bottom:0}.principles,.levels-rail{grid-template-columns:1fr}.principles{gap:24px}.principle span{margin-bottom:10px}.levels-section{padding-block:48px}.level,.level+.level{border-left:0;border-bottom:1px solid var(--line);padding:24px 0}.level:last-child{border-bottom:0;padding-bottom:0}.level-number{margin-bottom:12px}.level p{max-width:none}.sheet-topline,.sheet-bottom,.sheet-content{padding-inline:18px}.terminal-body{padding:20px}.closing{gap:24px}.closing-mark{display:none}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}.skills-section{border-bottom:1px solid var(--line);grid-template-columns:1fr 1fr;gap:64px;padding-block:72px;display:grid}.skills-section p{color:var(--muted)}.skills-download{flex-direction:column;justify-content:center;align-items:flex-start;gap:20px;display:flex}.skills-download p{margin:0;font-size:14px}@media (width<=720px){.skills-section{grid-template-columns:1fr;gap:28px;padding-block:48px}.skills-download .button{white-space:normal;max-width:100%}.site-header nav a{align-items:center;min-height:44px;display:inline-flex}}