/* === ODX — Base styles === */
:root{color-scheme:light;--paper:#f8f7f3;--ink:#25251f;--muted:#6c6b62;--line:#d9d7ce;--soft:#e9e7df;--accent:#765a45;--result:#f1efe9;--measure:70rem}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:Georgia,"Times New Roman",serif;font-size:17px;line-height:1.68;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body:before{content:"";display:block;height:3px;background:var(--ink)}
a{color:inherit;text-decoration-thickness:1px;text-underline-offset:4px;transition:color .15s ease}
a:hover{color:var(--accent)}
.shell{width:min(var(--measure),calc(100% - 72px));margin:0 auto}
.site-header{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:25px 0 20px;border-bottom:1px solid var(--line)}
.wordmark{display:flex;align-items:baseline;gap:9px;font-size:17px;line-height:1;text-decoration:none;letter-spacing:-.3px}
.wordmark strong{font-size:21px;font-weight:normal;letter-spacing:-.8px}
.wordmark span{font-size:11px;color:var(--muted);letter-spacing:.02em}
nav{display:flex;flex-wrap:wrap;gap:6px 20px}
nav a{color:var(--muted);font-size:12px;text-decoration:none;padding:4px 0;border-bottom:1px solid transparent}
nav a:hover,nav a:focus-visible{color:var(--ink);border-bottom-color:var(--ink)}
nav a.nav-active{color:var(--ink);border-bottom-color:var(--ink)}
main{padding:66px 0 75px}
.intro{display:grid;grid-template-columns:minmax(0,1fr) minmax(240px,330px);gap:52px;align-items:end;margin:0 0 72px;padding:10px 0 0}
.intro-main{max-width:680px}
.kicker{margin:0 0 17px;color:var(--muted);font:10px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.12em;text-transform:uppercase}
h1{margin:0 0 21px;font-size:clamp(43px,6.6vw,75px);font-weight:normal;line-height:.98;letter-spacing:-3.8px}
.intro p{margin:0;color:#514f47;font-size:18px;line-height:1.64}
.intro-side{padding:0 0 5px 19px;border-left:1px solid var(--line)}
.intro-side p{font-size:14px;line-height:1.7;color:var(--muted)}
.intro-side p+p{margin-top:10px}
section{display:grid;grid-template-columns:18% minmax(0,1fr);column-gap:6%;padding:32px 0 41px;border-top:1px solid var(--line);scroll-margin-top:20px}
.section-head{align-self:start;position:sticky;top:18px}
.section-no{display:block;margin:1px 0 9px;color:var(--muted);font:10px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.11em}
h2{margin:0;font-size:25px;line-height:1.2;font-weight:normal;letter-spacing:-.7px}
.content{max-width:730px;min-width:0}
.entry{padding:0 0 25px;margin:0 0 24px;border-bottom:1px solid var(--soft)}
.entry:last-child{padding-bottom:0;margin-bottom:0;border-bottom:0}
h3{margin:0 0 8px;font-size:19px;line-height:1.38;font-weight:normal;letter-spacing:-.25px}
p{margin:0 0 12px}
p:last-child{margin-bottom:0}
.lede{font-size:18px;color:#45433d}
.note{margin-top:13px;padding-left:14px;border-left:2px solid var(--line);color:#5c594f}
.term{display:grid;grid-template-columns:158px minmax(0,1fr);gap:18px;padding:0 0 18px;margin:0 0 18px;border-bottom:1px solid var(--soft)}
.term:last-of-type{margin-bottom:0;padding-bottom:0;border:0}
.term h3{margin:0;font-size:17px}
.term p{margin:0;color:#49473f}
.question{display:grid;grid-template-columns:158px minmax(0,1fr);gap:18px;padding:0 0 20px;margin:0 0 20px;border-bottom:1px solid var(--soft)}
.question:last-child{margin-bottom:0;padding-bottom:0;border:0}
.question h3{margin:0}
.question p{color:#49473f}
.revision{display:grid;grid-template-columns:112px minmax(0,1fr);gap:20px;padding:0 0 20px;margin:0 0 20px;border-bottom:1px solid var(--soft)}
.revision:last-child{padding-bottom:0;margin-bottom:0;border:0}
time{font:10px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;color:var(--muted);padding-top:5px}
.source-list{margin-top:17px;padding-top:13px;border-top:1px solid var(--soft);font-size:14px;color:#5a574f}
.source-list a{white-space:normal}
.inline-list{display:flex;flex-wrap:wrap;gap:7px 18px;margin-top:11px;font-size:14px}
footer{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding:15px 0 24px;color:var(--muted);font-size:11px}
:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
.skip-link{position:absolute;left:-9999px;top:0;z-index:10;background:var(--ink);color:var(--paper);padding:8px 14px;font-size:12px;text-decoration:none}
.skip-link:focus{left:16px;top:10px;color:var(--paper)}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
[hidden]{display:none!important}

/* === Tools page === */
.tools-page main{padding:48px 0 72px}
.tools-intro{margin:0 0 30px;padding:0 0 25px;border-bottom:1px solid var(--line)}
.tools-intro h1{margin:0 0 11px;font-size:clamp(36px,5vw,50px);line-height:1.04;letter-spacing:-2.2px}
.tools-intro p{max-width:580px;margin:0;color:var(--muted);font-size:15px;line-height:1.65}

/* Tool index */
.tools-search{display:flex;align-items:center;gap:14px;margin:0 0 28px}
.search-field{position:relative;width:min(100%,380px)}
.search-field input{width:100%;height:38px;padding:0 36px 0 11px;border:1px solid var(--line);border-radius:2px;background:transparent;color:var(--ink);font-family:inherit;font-size:14px;outline:none;transition:border-color .15s}
.search-field input:focus{border-color:var(--accent)}
.search-field input::placeholder{color:var(--muted)}
.search-field input::-webkit-search-cancel-button{display:none}
.search-clear{position:absolute;right:4px;top:50%;transform:translateY(-50%);width:28px;height:28px;border:0;background:transparent;color:var(--muted);font-size:16px;line-height:1;cursor:pointer;border-radius:2px}
.search-clear:hover{color:var(--ink)}
.search-count{margin-left:auto;color:var(--muted);font:10px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.06em;white-space:nowrap}
.tools-category{margin:0;padding:25px 0 31px}
.tools-category-title{display:flex;align-items:baseline;gap:9px;margin:0 0 11px;color:var(--muted);font:10px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;font-weight:normal;letter-spacing:.12em;text-transform:uppercase}
.tools-category-count{color:var(--muted);font-size:10px;letter-spacing:.04em}
.tools-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:0;padding:0;list-style:none}
.tools-grid li{min-width:0}
.tool-card{display:block;height:100%;min-height:74px;padding:12px 14px 13px;border:1px solid var(--line);background:var(--paper);text-decoration:none;transition:background .15s,color .15s,border-color .15s}
.tool-card:hover{background:var(--result);color:var(--ink);border-color:var(--accent)}
.tool-card:hover .tool-card-name{text-decoration:underline;text-underline-offset:3px}
.tool-card:focus-visible{outline:2px solid var(--accent);outline-offset:-3px}
.tool-card-name{display:block;margin:0 0 3px;font-size:15px;line-height:1.35;letter-spacing:-.15px}
.tool-card-desc{display:block;color:var(--muted);font-size:12px;line-height:1.5}
.tools-empty{margin:0;padding:32px 0 18px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}
.tools-noscript{margin:24px 0;padding:12px 14px;border-left:2px solid var(--accent);color:#49473f;font-size:14px}

/* Open tool */
.tool-panel{max-width:780px}
.tool-panel-header{margin:0 0 27px;padding:0 0 18px;border-bottom:1px solid var(--line)}
.tool-back{display:inline-block;padding:0;border:0;background:transparent;color:var(--muted);font-family:inherit;font-size:13px;line-height:1.4;cursor:pointer}
.tool-back:hover{color:var(--accent)}
.tool-panel h2{display:block;margin:13px 0 5px;font-size:clamp(28px,4vw,36px);font-weight:normal;line-height:1.15;letter-spacing:-1.2px}
.tool-panel-desc{max-width:560px;margin:0;color:var(--muted);font-size:14px;line-height:1.6}
.tool-body{min-width:0}
.tool-body p{font-size:14px}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field-label,.fieldset-label{color:var(--muted);font:10px/1.4 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.1em;text-transform:uppercase}
.tool-grid{display:grid;grid-template-columns:minmax(140px,.8fr) minmax(0,1.4fr);gap:18px;align-items:end}
.unit-pair{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:8px;align-items:end}
.tool-input,.tool-select,.tool-textarea{width:100%;border:1px solid var(--line);border-radius:2px;background:transparent;color:var(--ink);outline:none;transition:border-color .15s,background .15s}
.tool-input,.tool-select{height:40px;padding:0 10px;font-size:14px}
.tool-input{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:15px}
.tool-select{cursor:pointer}
.tool-input:focus,.tool-select:focus,.tool-textarea:focus{border-color:var(--accent)}
.tool-input.invalid,.tool-textarea.invalid,.tool-select.invalid{border-color:#a94a43;background:#fbf3f1}
.tool-input::placeholder,.tool-textarea::placeholder{color:#9a988e}
.tool-swap{width:40px;height:40px;padding:0;border:1px solid var(--line);border-radius:2px;background:transparent;color:var(--muted);font-size:16px;line-height:1;cursor:pointer;transition:border-color .15s,color .15s,background .15s}
.tool-swap:hover{border-color:var(--accent);color:var(--accent);background:var(--result)}
.tool-swap:focus-visible{outline-offset:2px}
.result-bar{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;flex-wrap:wrap;margin:24px 0 0;padding:17px 0 0;border-top:1px solid var(--soft)}
.result-main{flex:1;min-width:220px}
.tool-result{display:block;min-height:44px;margin:7px 0 0;padding:9px 12px;border-left:2px solid var(--soft);background:var(--result);font:15px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;overflow-wrap:anywhere}
.tool-result:empty::before{content:"—";color:var(--muted)}
.tool-result.has-value{border-left-color:var(--accent)}
.result-actions,.tool-actions{display:flex;flex-wrap:wrap;gap:8px}
.tool-btn{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 13px;border:1px solid var(--line);border-radius:2px;background:transparent;color:var(--ink);font-family:inherit;font-size:13px;line-height:1;cursor:pointer;white-space:nowrap;transition:border-color .15s,color .15s,background .15s}
.tool-btn:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}
.tool-btn:disabled{opacity:.38;cursor:not-allowed}
.tool-btn.primary{border-color:var(--ink);background:var(--ink);color:var(--paper)}
.tool-btn.primary:hover:not(:disabled){border-color:var(--accent);background:var(--accent);color:var(--paper)}
.tool-btn.copied{border-color:#4f7a62;color:#3f6a52;background:#f0f5f1}
.tool-btn.failed{border-color:#a94a43;color:#a94a43}
.tool-btn.small{height:29px;padding:0 9px;font-size:12px}
.tool-error{margin:8px 0 0;color:#a94a43;font-size:12px;line-height:1.5}
.tool-error:empty{display:none}
.tool-hint{margin:9px 0 0;color:var(--muted);font-size:12px;line-height:1.55}
.tool-hint code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:11px}
.tool-note{margin:18px 0 0;padding-top:14px;border-top:1px solid var(--soft);color:var(--muted);font-size:12px;line-height:1.55}

/* Number bases */
.base-input-grid{display:grid;grid-template-columns:190px minmax(0,1fr);gap:14px;align-items:end}
.base-results{margin:25px 0 0;border-top:1px solid var(--line)}
.base-row{display:grid;grid-template-columns:74px minmax(0,1fr) auto;gap:13px;align-items:center;min-height:44px;padding:7px 0;border-bottom:1px solid var(--soft)}
.base-label{color:var(--muted);font:10px/1.4 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.1em;text-transform:uppercase}
.base-value{min-width:0;font:13px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;overflow-wrap:anywhere;word-break:break-all}
.base-value:empty::before{content:"—";color:var(--muted)}

/* Text encoding, JSON, text utility */
.tool-textarea{min-height:150px;padding:10px 12px;font:13px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;resize:vertical}
.tool-output{min-height:150px;margin:0;padding:10px 12px;border:1px solid var(--soft);border-left:2px solid var(--soft);background:var(--result);font:13px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere;overflow-x:auto}
.tool-output.has-value{border-left-color:var(--accent)}
.tool-output:empty::before{content:"Output appears here.";color:var(--muted)}
.output-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin:20px 0 6px}
.output-head .field-label{margin:0}
.tool-field{margin:0 0 16px}
.tool-field:last-child{margin-bottom:0}
.tool-field>.field-label{display:block;margin:0 0 6px}
.encoding-mode{max-width:260px}

/* Color */
.color-layout{display:grid;grid-template-columns:76px minmax(0,1fr);gap:24px;align-items:start}
.color-preview{width:76px;height:76px;border:1px solid var(--line);border-radius:2px;background:#765a45}
.color-fields{display:flex;flex-direction:column;gap:13px;min-width:0}
.color-row{display:grid;grid-template-columns:43px minmax(0,1fr);gap:10px;align-items:center}
.color-triad{display:flex;gap:8px;min-width:0}
.color-part{display:flex;align-items:center;gap:6px;flex:1;min-width:0}
.color-part span{color:var(--muted);font:10px/1 ui-monospace,SFMono-Regular,Consolas,monospace}
.color-part .tool-input{height:36px;min-width:0}
.color-hex .tool-input{max-width:none}

/* JSON */
.json-toolbar{display:flex;flex-wrap:wrap;align-items:flex-end;gap:8px;margin:0 0 16px}
.json-indent-field{display:flex;align-items:center;gap:7px;margin-left:3px;color:var(--muted);font-size:12px}
.json-indent{width:auto;height:36px;padding:0 7px;font-size:12px}
.json-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px;align-items:start}
.json-grid .tool-textarea,.json-grid .tool-output{min-height:240px}
.json-grid .output-head{margin:0 0 6px;min-height:22px}
.json-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;padding-top:15px;border-top:1px solid var(--soft)}

/* Text utility */
.text-stats{display:flex;flex-wrap:wrap;gap:8px 26px;margin:11px 0 0;padding:0;list-style:none;color:var(--muted);font-size:12px;line-height:1.5}
.text-stats strong{margin-right:4px;color:var(--ink);font:15px/1 ui-monospace,SFMono-Regular,Consolas,monospace;font-weight:normal}
.case-block{margin:20px 0 0;padding:16px 0 0;border-top:1px solid var(--soft)}
.case-buttons{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.case-buttons .tool-btn{height:32px;padding:0 10px;font-size:12px}

/* Responsive */
@media(max-width:980px){
  .tools-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .json-grid{grid-template-columns:1fr}
  .json-grid .tool-textarea,.json-grid .tool-output{min-height:180px}
}
@media(max-width:760px){
  .shell{width:calc(100% - 38px)}
  .site-header{align-items:flex-start;flex-direction:column;gap:17px;padding-top:22px}
  nav{gap:8px 16px}
  main{padding-top:43px}
  .intro{grid-template-columns:1fr;gap:23px;margin-bottom:50px}
  .intro-side{max-width:480px;padding:0 0 0 14px}
  .intro p{font-size:17px}
  section{grid-template-columns:1fr;gap:19px;padding:26px 0 32px}
  .section-head{position:static}
  .section-no{display:inline-block;margin:0 9px 0 0}
  h2{display:inline;font-size:22px}
  .term,.question{grid-template-columns:1fr;gap:4px}
  .revision{grid-template-columns:88px minmax(0,1fr);gap:12px}
  .tools-page main{padding-top:36px}
  .tools-search{align-items:flex-start;flex-wrap:wrap}
  .search-field{width:100%}
  .search-count{margin-left:0;order:3}
  .tool-grid{grid-template-columns:1fr}
  .unit-pair{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr)}
  .result-bar{flex-direction:column;align-items:stretch}
  .result-main{min-width:0}
  .result-actions{justify-content:flex-start}
  .color-layout{grid-template-columns:64px minmax(0,1fr);gap:16px}
  .color-preview{width:64px;height:64px}
}
@media(max-width:580px){
  .tools-grid{grid-template-columns:1fr}
  .tool-card{min-height:0;padding:12px 14px}
  .base-input-grid{grid-template-columns:1fr}
  .base-row{grid-template-columns:64px minmax(0,1fr) auto;gap:9px}
  .color-layout{grid-template-columns:1fr}
  .color-preview{width:100%;height:44px}
  .color-row{grid-template-columns:1fr;gap:5px}
  .color-triad{width:100%}
  .json-toolbar .json-indent-field{width:100%;margin-left:0}
  .tool-btn{padding:0 11px}
}
@media(max-width:420px){
  h1{letter-spacing:-2.8px}
  .shell{width:calc(100% - 32px)}
  nav{column-gap:13px}
  nav a{font-size:12px}
  .tools-intro h1{letter-spacing:-1.5px}
  .tool-panel h2{letter-spacing:-.8px}
  .unit-pair{grid-template-columns:1fr;gap:8px}
  .unit-pair .tool-swap{width:100%}
  .color-triad{flex-direction:column}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}a,.tool-card,.tool-btn,.tool-swap,.tool-input,.tool-select,.tool-textarea{transition:none}}