@font-face{font-family:Space Grotesk;src:url(fonts/space-grotesk-700.ttf) format("truetype");font-weight:700;font-display:swap}
@font-face{font-family:IBM Plex Sans;src:url(fonts/ibm-plex-sans-400.ttf) format("truetype");font-weight:400;font-display:swap}
@font-face{font-family:IBM Plex Sans;src:url(fonts/ibm-plex-sans-600.ttf) format("truetype");font-weight:600;font-display:swap}
:root{--paper:#f4f5f6;--surface:#fff;--ink:#252331;--muted:#63616e;--line:#d8d8df;--plum:#3d294e;--accent:#654184;--teal:#086d64;--teal-soft:#dcefeb;--danger:#a83236;--danger-soft:#fae7e4;--soft:#eae8ef;--radius:4px;--body:"IBM Plex Sans",sans-serif;--display:"Space Grotesk",sans-serif;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;color-scheme:light}
:root[data-theme=dark]{--paper:#17171b;--surface:#222228;--ink:#f1eff4;--muted:#b9b6c5;--line:#44414d;--accent:#d7b3ef;--teal:#82dbcc;--teal-soft:#203a36;--danger:#ffaea8;--danger-soft:#43282a;--soft:#302d37;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scrollbar-color:var(--muted) var(--paper)}body{margin:0;font-family:var(--body);background:var(--paper);color:var(--ink);font-size:16px;line-height:1.6;letter-spacing:0}::selection{background:var(--teal);color:var(--surface)}a{color:var(--accent);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}button,input{font:inherit}button,a,input{touch-action:manipulation}button{cursor:pointer}button:disabled,input:disabled{cursor:not-allowed;opacity:.55}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:4px}h1,h2,h3,p{margin:0}h1,h2,h3{font-family:var(--display);font-weight:700;line-height:1.15;letter-spacing:0;text-wrap:balance}h1{font-size:48px;max-width:800px}h2{font-size:28px}h3{font-size:21px}p{max-width:70ch}small{font-size:13px}code,.numeric{font-family:var(--mono);font-variant-numeric:tabular-nums}code{font-size:.9em}i{font-size:22px;line-height:1}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:8px;left:8px;transform:translateY(-150%);background:var(--surface);padding:12px;z-index:30}.skip-link:focus{transform:none}
.rail{width:212px;position:fixed;inset:0 auto 0 0;background:var(--plum);color:#fff;padding:32px 20px;display:flex;flex-direction:column;z-index:10}.brand{color:#fff;text-decoration:none;font-family:var(--display);font-size:27px;display:flex;align-items:center;gap:12px}.brand-mark{display:grid;grid-template-columns:repeat(2,8px);gap:3px}.brand-mark b{width:8px;height:8px;background:#8cdfcc}.brand-mark b:last-child{background:#ffb1a4}.rail nav{display:grid;gap:8px;margin-top:48px}.rail nav a{padding:12px;display:flex;align-items:center;gap:12px;color:#e0d6e8;text-decoration:none;border-radius:var(--radius);font-size:15px;min-height:48px}.rail nav a:hover{background:#503a62;color:#fff}.rail nav a[aria-current=page]{background:#f4f5f6;color:#3d294e;font-weight:600}.rail-bottom{margin-top:auto;padding-top:40px;display:grid;gap:18px}.rail-bottom a{color:#e0d6e8;font-size:14px;display:flex;align-items:center;gap:8px;text-decoration:none}.rail-note{font-size:12px;color:#c8b9d5}.theme-toggle{background:#503a62;color:#fff;border:0;width:44px;height:44px;border-radius:var(--radius);display:grid;place-items:center}.theme-toggle:hover{background:#654c79}
.shell{margin-left:212px}.topbar{border-bottom:1px solid var(--line);min-height:64px;padding:16px 40px;display:flex;justify-content:space-between;gap:20px;align-items:center;font-size:13px;color:var(--muted)}.topbar strong{color:var(--ink);font-weight:600}.topbar .utc-tag{display:flex;align-items:center;gap:8px}.utc-tag b{width:7px;height:7px;border-radius:50%;background:var(--teal)}main{max-width:1280px;margin:0 auto;padding:40px 40px 64px}.page-heading{margin-bottom:32px;display:flex;justify-content:space-between;align-items:flex-end;gap:32px}.page-heading p{margin-top:16px;color:var(--muted);max-width:66ch;font-size:18px}.page-heading .page-index{color:var(--accent);font-family:var(--mono);font-size:14px;white-space:nowrap}.lab{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.lab-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:18px 24px;border-bottom:1px solid var(--line)}.lab-head h2{font-size:20px}.state{font-size:13px;font-weight:600;display:flex;gap:8px;align-items:center;color:var(--teal)}.state:before{content:"";width:8px;height:8px;border-radius:50%;background:currentColor}.lab-body{padding:24px}.lab-tools{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:24px}.btn{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:var(--radius);text-decoration:none;font-size:14px;font-weight:600;line-height:1.4}.btn:hover{background:var(--soft)}.btn.primary{background:var(--plum);border-color:var(--plum);color:#fff}.btn.primary:hover{background:#594068}.btn.danger{background:var(--danger-soft);border-color:var(--danger-soft);color:var(--danger)}.btn i{font-size:19px}.icon-btn{width:44px;padding:0}.lab-tools .grow{flex:1}.memory-label{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:var(--muted);margin-bottom:12px}.bit-strip{display:grid;grid-template-columns:repeat(32,minmax(0,1fr));gap:3px}.bit{min-width:0;border:0;border-radius:2px;padding:12px 0 6px;background:var(--soft);color:var(--muted);display:grid;gap:7px;min-height:66px;align-content:center;font-family:var(--mono);font-size:16px}.bit small{font-size:9px}.bit[data-on="1"]{background:var(--teal-soft);color:var(--teal)}.bit.sign-bit{background:var(--danger-soft);color:var(--danger)}.bit.sign-bit[data-on="1"]{background:var(--danger);color:var(--surface)}.bit:nth-child(8n){margin-right:4px}.bit:hover{outline:2px solid var(--accent);outline-offset:-2px}.memory-footer{display:flex;justify-content:space-between;gap:16px;color:var(--muted);font-size:12px;margin-top:10px}
.readouts{display:grid;grid-template-columns:1fr 1fr;gap:32px;margin-top:28px}.readout-label{font-size:13px;color:var(--muted);display:block;margin-bottom:8px}.timestamp-field{display:flex;align-items:center;gap:8px}.timestamp-field input{width:100%;min-width:0;font-family:var(--mono);font-size:21px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);color:var(--ink);padding:12px;caret-color:var(--accent)}.timestamp-field input[aria-invalid=true]{border-color:var(--danger)}.input-error{color:var(--danger);font-size:13px;min-height:24px;margin-top:6px}.signed-value{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:30px;line-height:1.8;overflow-wrap:anywhere;color:var(--teal)}.date-pair{display:grid;grid-template-columns:1fr 1fr;background:var(--paper);margin-top:24px}.date-cell{padding:20px 24px;min-width:0}.date-cell+.date-cell{border-left:1px solid var(--line)}.date-cell time{display:block;font-family:var(--mono);font-size:15px;overflow-wrap:anywhere}.lab[data-overflow=true] .state,.lab[data-overflow=true] .signed-value{color:var(--danger)}.lab[data-overflow=true] .interpreted{background:var(--danger-soft)}.explanation{font-size:14px;color:var(--muted);margin-top:18px}.wide-row{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--teal);margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}.wide-row code{font-size:14px;overflow-wrap:anywhere}.lab-foot{border-top:1px solid var(--line);padding:16px 24px;display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:13px;color:var(--muted)}.lab-foot a{display:flex;align-items:center;gap:8px;font-weight:600;white-space:nowrap}.timeline{margin-top:24px}.timeline label{font-size:13px;color:var(--muted)}input[type=range]{width:100%;height:32px;margin:12px 0 0;accent-color:var(--teal)}.timeline-labels{display:flex;justify-content:space-between;font-family:var(--mono);font-size:12px;color:var(--muted)}.range-note{font-size:13px;color:var(--danger);min-height:22px}.model-note{margin-top:20px;font-size:13px;color:var(--muted)}
.sections{margin-top:48px}.explain-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}.explain-grid h2{margin-bottom:16px}.explain-grid p+p{margin-top:12px}.formula{font-family:var(--mono);font-size:18px;padding:16px 0;color:var(--teal)}.countdown-band{margin-top:36px;padding:28px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:24px;align-items:center}.countdown-band p{font-size:14px;color:var(--muted);margin-top:8px}.countdown-band .numeric{font-size:24px;color:var(--accent);white-space:nowrap}.next-route{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:28px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}.next-route small{color:var(--muted);display:block;margin-top:6px}.next-route i{color:var(--accent);font-size:28px}.next-route:hover h3{color:var(--accent)}
.case-list{border-top:1px solid var(--line)}.case{display:grid;grid-template-columns:120px minmax(0,1fr) 240px;gap:28px;padding:32px 0;border-bottom:1px solid var(--line)}.case-year{font-family:var(--mono);font-size:30px;color:var(--accent)}.case h2{font-size:25px;margin-bottom:14px}.case p{color:var(--muted)}.case-source{margin-top:16px;display:inline-flex;align-items:center;gap:8px;font-size:14px}.case-aside{font-size:14px;background:var(--teal-soft);color:var(--teal);padding:20px;align-self:start}.case-aside strong{display:block;margin-bottom:8px}.case.caution .case-aside{background:var(--soft);color:var(--muted)}.reader-note{margin-top:32px;max-width:75ch}.reader-note h2{font-size:24px;margin-bottom:12px}
.capacity-table{width:100%;border-collapse:collapse;background:var(--surface);font-size:15px}.capacity-table th,.capacity-table td{text-align:left;padding:20px 24px;border-bottom:1px solid var(--line);vertical-align:top}.capacity-table th{font-size:13px;color:var(--muted);font-weight:600}.capacity-table td:first-child{font-family:var(--display);font-size:24px}.capacity-table code{overflow-wrap:anywhere}.capacity-table tr:last-child td{background:var(--teal-soft);color:var(--teal)}.capacity-table small{display:block;margin-top:8px}.migration{margin-top:40px;display:grid;grid-template-columns:1.2fr 1fr;gap:56px}.migration h2{margin-bottom:20px}.checklist{list-style:none;padding:0;margin:0}.checklist li{border-top:1px solid var(--line);padding:18px 0}.checklist label{display:grid;grid-template-columns:24px 1fr;gap:12px;cursor:pointer}.checklist input{width:20px;height:20px;margin:4px 0;accent-color:var(--teal)}.checklist strong{display:block;font-weight:600}.checklist small{color:var(--muted);display:block;margin-top:4px}.checklist label:has(input:checked) strong{color:var(--teal)}.code-block{font-family:var(--mono);background:var(--soft);padding:24px;font-size:14px;overflow-x:auto;margin:20px 0;line-height:1.7}.sources{margin-top:32px;font-size:14px;color:var(--muted)}.sources a{display:block;margin-top:12px}.footer{margin:0 40px;padding:24px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;max-width:1200px;font-size:12px;color:var(--muted)}
@media(min-width:1600px){.footer{margin-left:auto;margin-right:auto}}
@media(max-width:1150px){.rail{width:184px;padding:28px 16px}.shell{margin-left:184px}main{padding:32px 28px 48px}.topbar{padding:16px 28px}.bit-strip{grid-template-columns:repeat(16,minmax(0,1fr));gap:4px}.case{grid-template-columns:88px minmax(0,1fr)}.case-aside{grid-column:2}.page-heading .page-index{display:none}.footer{margin:0 28px}.migration{gap:32px}}
@media(max-width:760px){.rail{position:static;width:100%;padding:16px 20px;display:grid;grid-template-columns:1fr auto;gap:16px}.brand{font-size:24px}.rail nav{grid-column:1/-1;grid-row:2;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin:0;gap:4px}.rail nav a{padding:9px 4px;gap:6px;justify-content:center;font-size:12px;min-height:44px}.rail nav i{display:none}.rail-bottom{margin:0;padding:0;display:block}.rail-bottom a,.rail-note{display:none}.shell{margin:0}.topbar{padding:12px 20px;min-height:48px;font-size:12px}.topbar .utc-tag{white-space:nowrap}main{padding:28px 20px 40px}h1{font-size:36px}h2{font-size:25px}.page-heading{margin-bottom:24px}.page-heading p{font-size:16px;margin-top:12px}.lab-head,.lab-body,.lab-foot{padding:16px}.lab-head h2{font-size:18px}.state{font-size:12px}.lab-tools{margin-bottom:20px}.lab-tools .grow{display:none}.lab-tools .btn{flex:1 0 auto}.bit-strip{grid-template-columns:repeat(8,minmax(0,1fr));gap:5px}.bit{min-height:48px;font-size:17px;padding:6px 0;gap:3px}.bit small{font-size:10px}.bit:nth-child(8n){margin:0}.memory-label{font-size:12px}.readouts{grid-template-columns:1fr;gap:12px;margin-top:20px}.signed-value{font-size:26px;line-height:1.4}.timestamp-field input{font-size:18px}.date-pair{grid-template-columns:1fr;margin-top:20px}.date-cell{padding:16px}.date-cell+.date-cell{border-left:0;border-top:1px solid var(--line)}.date-cell time{font-size:13px}.lab-foot{align-items:flex-start;flex-direction:column;gap:12px}.explain-grid,.migration{grid-template-columns:1fr;gap:28px}.sections{margin-top:32px}.countdown-band{align-items:flex-start;flex-direction:column;gap:16px}.countdown-band .numeric{font-size:19px;white-space:normal}.case{grid-template-columns:1fr;gap:12px;padding:24px 0}.case-year{font-size:22px}.case-aside{grid-column:auto}.capacity-table th,.capacity-table td{padding:14px 12px}.capacity-table{font-size:13px;table-layout:fixed}.capacity-table th:first-child{width:70px}.capacity-table td:first-child{font-size:18px}.capacity-table code{font-size:11px}.capacity-table th:last-child{width:29%}.footer{margin:0 20px;flex-direction:column;gap:8px}.code-block{padding:16px;font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

.interpreted,.signed-value{transition:background-color 160ms ease-out,color 160ms ease-out}
.btn[data-action="now"][aria-pressed="true"]{background:var(--teal-soft);border-color:var(--teal);color:var(--teal)}