:root{--paper:#f7f5ef;--card:#fffdf8;--ink:#14213d;--ink2:#4a5168;--line:#d9d3c4;--signal:#f2c200;
--signall:#fdf3c4;--pink:#c8104f;--green:#1d6b4f;--greenl:#dcefe6;--board:#0f1a30;--boardt:#f6e7a8;
--serif:Georgia,"Times New Roman",serif;--mono:Consolas,"SFMono-Regular",Menlo,monospace;
--sans:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.62 var(--sans)}
img{max-width:100%;height:auto;display:block}
a{color:var(--pink);text-underline-offset:3px}
a:hover{color:var(--ink)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--signal);outline-offset:2px}
.ofk-skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:10px 14px;z-index:9}
.ofk-skip:focus{left:8px}
.ofk-wrap{max-width:1160px;margin:0 auto;padding:0 20px}

.ofk-top{background:var(--card);border-bottom:3px solid var(--ink)}
.ofk-top-in{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:66px;flex-wrap:wrap}
.ofk-brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font:700 15px/1.2 var(--serif);min-width:0;min-height:44px}
.ofk-brand span{min-width:0;overflow-wrap:anywhere}
.ofk-nav{display:flex;flex-wrap:nowrap;gap:2px;overflow-x:auto}
.ofk-nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 10px;color:var(--ink);text-decoration:none;font-size:15px;white-space:nowrap;border-bottom:3px solid transparent}
.ofk-nav a:hover{border-bottom-color:var(--signal)}
.ofk-nav a[aria-current=page]{border-bottom-color:var(--pink);font-weight:600}

.ofk-hero{padding:38px 0 26px;background:linear-gradient(180deg,var(--card),var(--paper))}
.ofk-plate-row{display:flex;align-items:center;gap:10px;margin:0 0 10px;font-size:14px;color:var(--ink2)}
.ofk-plate{display:inline-block;background:var(--signal);color:var(--ink);font:700 14px/1 var(--mono);padding:6px 9px;border-radius:3px}
.ofk-hero h1,.ofk-phead h1{font:700 clamp(30px,4.4vw,48px)/1.12 var(--serif);margin:0 0 12px;max-width:860px;letter-spacing:-.01em}
.ofk-lede{font-size:19px;color:var(--ink2);max-width:760px;margin:0 0 18px}
.ofk-search{background:var(--card);border:2px solid var(--ink);border-radius:8px;padding:14px 16px;max-width:820px;box-shadow:6px 6px 0 var(--signal)}
.ofk-search-label{display:block;font-weight:600;font-size:15px;margin-bottom:8px}
.ofk-search-row{display:flex;gap:10px}
.ofk-search input[type=search]{flex:1;min-width:0;min-height:52px;border:1px solid var(--ink2);border-radius:6px;padding:0 14px;font:inherit;font-size:17px;background:#fff;color:var(--ink)}
.ofk-search button{min-height:52px;padding:0 20px;border:0;border-radius:6px;background:var(--ink);color:#fff;font:600 16px var(--sans);cursor:pointer}
.ofk-search button:hover{background:var(--pink)}
.ofk-subnav{display:flex;flex-wrap:wrap;gap:6px 22px;margin-top:14px;font-size:15px}
.ofk-subnav a{display:inline-flex;align-items:center;min-height:44px;color:var(--ink);text-decoration-color:var(--signal);text-decoration-thickness:3px}

.ofk-wallsec{padding:26px 0 34px}
.ofk-wallsec h2,.ofk-sec h2{font:700 clamp(24px,2.8vw,32px)/1.2 var(--serif);margin:0 0 12px}
.ofk-wall-intro{max-width:760px;color:var(--ink2);margin:0 0 18px}
.ofk-wall{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.ofk-tile{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:8px;overflow:hidden;color:var(--ink);text-decoration:none;min-height:44px}
.ofk-tile:hover{border-color:var(--ink);box-shadow:4px 4px 0 var(--signal)}
.ofk-tile img{aspect-ratio:1/1;object-fit:cover;width:100%;background:#fff}
.ofk-tile-name{font:700 16px/1.3 var(--serif);padding:10px 12px 0}
.ofk-tile-tag{font-size:14px;color:var(--ink2);padding:2px 12px 0}
.ofk-tile-dest{font:12px/1 var(--mono);color:var(--green);padding:8px 12px 12px;text-transform:uppercase;letter-spacing:.04em}

.ofk-sec{padding:34px 0;border-top:1px solid var(--line)}
.ofk-sec-tint{background:var(--card)}
.ofk-sec h2{display:flex;align-items:flex-start;gap:12px;max-width:880px}
.ofk-pn{flex:none;display:inline-flex;align-items:center;justify-content:center;min-width:34px;height:34px;margin-top:2px;background:var(--ink);color:var(--signal);font:700 15px/1 var(--mono);border-radius:4px}
.ofk-sec p,.ofk-sec li{max-width:760px}
.ofk-sec>.ofk-wrap>p,.ofk-sec>.ofk-wrap>.ofk-list,.ofk-sec>.ofk-wrap>.ofk-steps,.ofk-sec>.ofk-wrap>.ofk-note,.ofk-sec>.ofk-wrap>.ofk-tscroll,.ofk-sec>.ofk-wrap>.ofk-faqs,.ofk-sec>.ofk-wrap>.ofk-board,.ofk-sec>.ofk-wrap>.ofk-next,.ofk-sec>.ofk-wrap>.ofk-tool,.ofk-sec>.ofk-wrap>.ofk-fig-wide,.ofk-sec>.ofk-wrap>h3{max-width:760px}
.ofk-sec h3{font:700 20px/1.3 var(--serif);margin:22px 0 8px}
.ofk-split{display:grid;grid-template-columns:minmax(0,45fr) minmax(0,55fr);gap:30px;align-items:stretch;margin:6px 0 18px}
.ofk-split-flip .ofk-fig{order:-1}
.ofk-split-flip{grid-template-columns:minmax(0,55fr) minmax(0,45fr)}
.ofk-split-txt{min-width:0}
.ofk-split-txt p:first-child{margin-top:0}
.ofk-fig{margin:0;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:10px;display:flex;flex-direction:column}
.ofk-fig img{width:100%;height:auto;border-radius:4px}
.ofk-fig figcaption{font-size:14px;color:var(--ink2);padding:8px 2px 0;line-height:1.5}
.ofk-fig-wide{margin:12px 0 18px}
.ofk-list{padding-left:20px}
.ofk-list li{margin:6px 0}
.ofk-steps{counter-reset:s;list-style:none;padding:0}
.ofk-steps li{counter-increment:s;position:relative;padding:4px 0 10px 46px}
.ofk-steps li:before{content:counter(s);position:absolute;left:0;top:4px;width:32px;height:32px;border-radius:50%;background:var(--signal);color:var(--ink);font:700 15px/32px var(--mono);text-align:center}
.ofk-note{background:var(--signall);border-left:5px solid var(--signal);padding:12px 16px;border-radius:0 6px 6px 0;margin:14px 0}
.ofk-note p{margin:0}
.ofk-tscroll{overflow-x:auto;margin:12px 0 18px;border:1px solid var(--line);border-radius:8px;background:var(--card)}
.ofk-table{border-collapse:collapse;width:100%;font-size:15px}
.ofk-table caption{text-align:left;padding:10px 12px;font-size:14px;color:var(--ink2);caption-side:bottom}
.ofk-table th,.ofk-table td{padding:9px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.ofk-table th{background:var(--ink);color:#fff;font-weight:600;white-space:nowrap}
.ofk-table td:first-child{font-family:var(--mono);font-size:14px;white-space:nowrap}
.ofk-table a{display:inline-flex;align-items:center;min-height:44px}
.ofk-num{font-family:var(--mono);white-space:nowrap}
.ofk-board{background:var(--board);color:#fff;border-radius:10px;padding:16px 18px;margin:14px 0 18px}
.ofk-board-h{font:700 13px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--signal);margin:0 0 10px}
.ofk-board ul{list-style:none;margin:0;padding:0}
.ofk-board li{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr) minmax(0,1.4fr);gap:12px;padding:9px 0;border-top:1px solid #2b3a5c;font-size:15px}
.ofk-b-l{font-family:var(--mono);color:var(--boardt);overflow-wrap:anywhere}
.ofk-b-m{font:700 16px var(--mono);color:#fff}
.ofk-b-r{color:#cfd6e6}
.ofk-board-n{font-size:13px;color:#b9c2d8;margin:10px 0 0}
.ofk-faqs{margin:10px 0}
.ofk-faq{background:var(--card);border:1px solid var(--line);border-radius:8px;margin:8px 0}
.ofk-faq summary{cursor:pointer;padding:12px 16px;font-weight:600;min-height:44px;display:flex;align-items:center}
.ofk-faq>div{padding:0 16px 10px}
.ofk-crumbs{display:flex;gap:8px;align-items:center;font-size:14px;color:var(--ink2);margin-bottom:6px}
.ofk-crumbs a{display:inline-flex;align-items:center;min-height:44px;min-width:44px}
.ofk-phead{padding:20px 0 24px;background:var(--card);border-bottom:1px solid var(--line)}
.ofk-next{list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.ofk-next li{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:10px 14px}
.ofk-next a{font:700 17px var(--serif);display:inline-flex;min-height:44px;align-items:center}
.ofk-next span{display:block;font-size:14px;color:var(--ink2)}

.ofk-strip{display:flex;width:100%;max-width:760px;border-radius:6px;overflow:hidden;border:1px solid var(--ink);margin:12px 0 4px}
.ofk-strip span{padding:8px 6px;font:12px/1.25 var(--mono);color:var(--ink);border-right:1px solid var(--ink);min-width:0;overflow-wrap:anywhere}
.ofk-strip span:last-child{border-right:0}
.ofk-strip-a{background:var(--signall)}.ofk-strip-b{background:var(--greenl)}.ofk-strip-c{background:#e7e9f2}.ofk-strip-d{background:#f6dbe5}

.ofk-tool{background:var(--card);border:2px solid var(--ink);border-radius:10px;padding:18px;margin:12px 0 18px}
.ofk-tool-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.ofk-tool label{display:block;font-weight:600;font-size:15px;margin-bottom:4px}
.ofk-tool input,.ofk-tool select{width:100%;min-height:46px;border:1px solid var(--ink2);border-radius:6px;padding:0 10px;font:inherit;background:#fff;color:var(--ink)}
.ofk-tool .ofk-hint{font-size:13px;color:var(--ink2);margin:4px 0 0}
.ofk-out{margin-top:16px;min-height:420px}
.ofk-out-sum{font-weight:600;margin:0 0 10px}
.ofk-res{list-style:none;padding:0;margin:0}
.ofk-res li{border:1px solid var(--line);border-radius:8px;padding:10px 12px;margin:8px 0;background:#fff;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr) minmax(0,1fr);gap:10px;font-size:15px}
.ofk-res b{font-family:var(--mono)}
.ofk-res .ofk-x{grid-column:1/-1;font-size:13px;color:var(--ink2)}
.ofk-res-out{opacity:.75}

.ofk-foot{background:var(--ink);color:#e8ebf3;padding:30px 0 40px;margin-top:20px;font-size:15px}
.ofk-foot a{color:var(--boardt)}
.ofk-foot-name{font:700 18px var(--serif);color:#fff}
.ofk-foot-nav{display:flex;flex-wrap:wrap;gap:4px 18px;margin:8px 0 12px}
.ofk-foot-nav a{display:inline-flex;align-items:center;min-height:44px}
@media (max-width:980px){.ofk-wall{grid-template-columns:repeat(3,minmax(0,1fr))}
.ofk-split,.ofk-split-flip{grid-template-columns:minmax(0,1fr)}.ofk-split-flip .ofk-fig{order:0}
.ofk-nav{width:100%}}
@media (max-width:640px){body{font-size:16px}.ofk-wall{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.ofk-search-row{flex-direction:column}.ofk-tool-grid,.ofk-next{grid-template-columns:minmax(0,1fr)}
.ofk-board li,.ofk-res li{grid-template-columns:minmax(0,1fr)}.ofk-top-in{padding-top:8px}
.ofk-strip{flex-wrap:wrap}.ofk-strip span{flex:1 1 45%!important}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
@media (prefers-color-scheme:dark){:root{--paper:#0e1526;--card:#16203a;--ink:#eef1f8;--ink2:#b9c1d6;--line:#2c3a5e;--signall:#3a3208;--greenl:#123629;--pink:#ff7aa6}
.ofk-search button,.ofk-pn,.ofk-table th{background:#26355c}
.ofk-search input[type=search],.ofk-tool input,.ofk-tool select,.ofk-res li{background:#0e1526;color:var(--ink)}
.ofk-tile img,.ofk-fig img{background:#fff}.ofk-foot{background:#080d19}
.ofk-strip span{color:#0e1526}.ofk-strip-c{background:#c9cfe2}.ofk-strip-a{background:#f6e7a8}.ofk-strip-b{background:#bfe3d2}.ofk-plate{color:#14213d}
.ofk-steps li:before{color:#14213d}.ofk-tile-dest{color:#7fd1a8}}

/* Local review: retain the navy and signal-yellow handbook, with quieter paper. */
:root{--paper:#f2f5f8;--card:#fff;--line:#ccd4de;--pink:#284b78;--signal:#e6ba27;--signall:#fff3c6}
.ofk-top-in{flex-wrap:nowrap;min-height:72px}
.ofk-brand{font-family:var(--sans);font-size:15px;flex-shrink:0}
.ofk-brand small{display:block;font-size:12px;line-height:1.5;font-weight:400;color:var(--ink2)}
.ofk-brand img{width:90px;height:auto}
.ofk-nav a{padding:0 9px;font-size:14px}
.ofk-nav a[aria-current=page]{border-bottom-color:var(--signal)}
.ofk-menu{display:none;min-width:64px;min-height:44px;border:1px solid var(--ink);border-radius:4px;background:var(--card);color:var(--ink);font:600 15px var(--sans);cursor:pointer}
.ofk-hero{padding:34px 0 24px;background:var(--card);border-bottom:1px solid var(--line)}
.ofk-hero h1{max-width:950px;font-size:clamp(31px,3.6vw,48px)}
.ofk-search{max-width:860px}
.ofk-search button:hover{background:#284b78}
.ofk-wall{grid-template-columns:repeat(8,minmax(0,1fr));gap:12px}
.ofk-tile{border-radius:4px}
.ofk-tile-name{font-family:var(--sans);font-size:14px;padding:9px 9px 0}
.ofk-tile-tag{font-size:12px;padding:3px 9px 9px;line-height:1.4}
.ofk-tile-dest{display:none}
.ofk-wallsec{padding:28px 0 36px}
.ofk-sec{padding:36px 0}
.ofk-sec h2{max-width:1000px}
.ofk-sec h3{margin-top:12px}
.ofk-split{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px;align-items:start}
.ofk-split .ofk-fig{height:auto}
.ofk-interface{max-width:1120px!important;margin:20px 0 0}
.ofk-interface img{width:100%;height:auto;object-fit:contain}
.ofk-interface figcaption{font-size:13px}
.ofk-prose{max-width:760px}
.ofk-reasons{display:grid;grid-template-columns:1fr 1fr;gap:38px}
.ofk-reasons>div{border-top:4px solid var(--signal);padding-top:14px;min-width:0}
.ofk-desk{display:grid;grid-template-columns:1.1fr 1fr;gap:36px}
.ofk-desk .ofk-board{margin:0;padding:24px;border-radius:4px}
.ofk-board a{color:#f4d478}
.ofk-board p{color:#e8edf6}
.ofk-board .ofk-board-h{color:var(--signal)}
.ofk-fig>a{display:block}
.ofk-sec>.ofk-wrap>.ofk-fig:not(.ofk-interface){max-width:800px}
.ofk-phead p:not(.ofk-lede){max-width:900px;font-size:15px;color:var(--ink2)}
.ofk-foot{margin-top:0}
.ofk-faq summary:after{content:'+';margin-left:auto;padding-left:15px}
.ofk-faq[open] summary:after{content:'−'}
.ofk-table{min-width:500px}
@media(max-width:1100px){.ofk-top-in{flex-wrap:wrap;position:relative;padding-top:10px;padding-bottom:10px;gap:8px}.ofk-menu{display:block;margin-left:auto}.ofk-nav{display:none;width:100%;flex-wrap:wrap;overflow:visible;padding:8px 0 0}.ofk-nav.is-open{display:flex}.ofk-nav a{flex:1 1 29%;white-space:normal}.ofk-wall{grid-template-columns:repeat(4,minmax(0,1fr))}.ofk-split{grid-template-columns:1fr}.ofk-split .ofk-fig{max-width:800px}}
@media(max-width:767px){.ofk-reasons,.ofk-desk{grid-template-columns:1fr;gap:24px}.ofk-wrap{padding-left:18px;padding-right:18px}.ofk-wall{grid-template-columns:repeat(2,minmax(0,1fr))}.ofk-hero{padding-top:24px}.ofk-hero h1{font-size:34px}.ofk-lede{font-size:17px}.ofk-brand img{width:72px}.ofk-brand{gap:7px;font-size:13px}.ofk-brand small{font-size:11px}.ofk-sec{padding:28px 0}.ofk-sec h2{font-size:27px}.ofk-tile-name{font-size:15px}.ofk-tile-tag{font-size:13px}.ofk-interface{padding:6px}.ofk-interface figcaption{font-size:12px}.ofk-subnav{gap:0 14px}.ofk-fig figcaption{overflow-wrap:anywhere}}
@media(prefers-color-scheme:dark){:root{--paper:#0e1526;--card:#16203a;--ink:#eef1f8;--ink2:#bec8dc;--line:#344362;--pink:#b3cfff;--signall:#3a3208}.ofk-search button{background:#e6ba27;color:#14213d}.ofk-search button:hover{background:#f4d478}.ofk-menu{border-color:#8b9ab7}.ofk-fig{background:#16203a}.ofk-plate{color:#14213d}.ofk-pn{color:#f4d478}.ofk-foot{background:#080d19}}