:root{
  --paper:#F6F5F1;
  --paper-2:#EFEDE7;
  --ink:#1C1E23;
  --ink-2:#585D66;
  --line:#DBD8CF;
  --chamber:#0E1014;
  --chamber-2:#151820;
  --chamber-line:#262B34;
  --chamber-txt:#C9CED6;
  --chamber-dim:#7E848E;
  --c:#009FE8;
  --m:#E4007F;
  --y:#F0D000;
  --ok:#2E9E5B;
  --serif:"Zen Old Mincho", "Hiragino Mincho ProN", serif;
  --sans:"Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", sans-serif;
  --mono:"IBM Plex Mono", ui-monospace, monospace;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:15.5px;
  line-height:2.0;
  letter-spacing:.02em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg,canvas{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
a{color:inherit}

/* ---- printer's control strip (signature divider) ---- */
.colorbar{
  height:12px;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);
  background:linear-gradient(90deg,
    #00A0E9 0 12.5%, #E4007F 12.5% 25%, #FFF100 25% 37.5%, #1C1E23 37.5% 50%,
    #E60012 50% 62.5%, #009944 62.5% 75%, #0068B7 75% 87.5%, #F6F5F1 87.5% 100%);
}
.colorbar--thin{height:8px}

/* ---- registration mark ---- */
.regmark{width:22px;height:22px;flex:none}
.regmark circle,.regmark line{stroke:currentColor;fill:none;stroke-width:1.4}

/* ---- layout ---- */
.wrap{max-width:900px;margin:0 auto;padding:0 20px}
.wrap--wide{max-width:1100px}

/* ---- hero ---- */
.hero{padding:clamp(40px,7vw,84px) 0 clamp(28px,4vw,44px)}
.hero__top{display:flex;align-items:center;gap:12px;color:var(--ink-2);margin-bottom:22px}
.hero__brand{font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase}
.hero__rule{flex:1;height:1px;background:var(--line)}
.hero h1{
  font-family:var(--serif);font-weight:900;
  font-size:clamp(30px,6.4vw,54px);
  line-height:1.35;letter-spacing:.045em;
}
.hero h1 .accent{
  background:linear-gradient(90deg,#0090D8, #B02090, #C8A400);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero__lead{margin-top:20px;max-width:640px;color:var(--ink-2);font-size:15px}
.hero__meta{
  margin-top:26px;display:flex;flex-wrap:wrap;gap:8px 22px;
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--ink-2);
}
.hero__meta span::before{content:"›";margin-right:7px;color:var(--c)}

/* ---- chamber (viewer) ---- */
.chamber{background:var(--chamber);color:var(--chamber-txt);position:relative}
.chamber__head{
  display:flex;align-items:center;gap:12px;
  padding:14px 20px;border-bottom:1px solid var(--chamber-line);
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;color:var(--chamber-dim);
}
.chamber__head .dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 8px var(--ok)}
.stage{position:relative;height:min(64vh,600px);min-height:400px;touch-action:none;cursor:grab}
.stage:active{cursor:grabbing}
.stage canvas{position:absolute;inset:0;width:100%;height:100%}
.stage__label{
  position:absolute;transform:translate(-50%,-130%);pointer-events:none;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;
  padding:3px 8px;border-radius:3px;background:rgba(10,12,16,.72);
  border:1px solid var(--chamber-line);white-space:nowrap;
  opacity:0;transition:opacity .25s;
}
.stage__note{
  position:absolute;left:14px;bottom:12px;right:14px;pointer-events:none;
  font-size:11px;line-height:1.7;color:var(--chamber-dim);
  font-family:var(--mono);letter-spacing:.02em;
}
.stage__axis{
  position:absolute;top:12px;right:14px;pointer-events:none;text-align:right;
  font-family:var(--mono);font-size:10.5px;color:var(--chamber-dim);line-height:1.9;
}

.chunk{display:inline-block}

/* ---- console ---- */
.console{border-top:1px solid var(--chamber-line);background:var(--chamber-2)}
.console__row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:14px 20px}
.console__row + .console__row{border-top:1px solid var(--chamber-line)}
.console__caption{
  flex:0 0 100%;font-family:var(--mono);font-size:10px;letter-spacing:.2em;
  color:var(--chamber-dim);text-transform:uppercase;margin-bottom:-2px;
}
.chip{
  display:inline-flex;align-items:center;gap:9px;min-height:44px;padding:0 16px;
  border:1px solid var(--chamber-line);border-radius:999px;background:#12151b;
  color:var(--chamber-dim);font-size:13px;font-weight:500;letter-spacing:.03em;
  transition:border-color .2s,color .2s,background .2s;
}
.chip .swatch{width:10px;height:10px;border-radius:50%;border:1.5px solid currentColor;background:transparent;transition:background .2s}
.chip[aria-pressed="true"]{color:#EAEDF2;border-color:var(--chip-c,#5f6670);background:#171b23}
.chip[aria-pressed="true"] .swatch{background:var(--chip-c,#fff);border-color:var(--chip-c,#fff)}
.seg{display:inline-flex;border:1px solid var(--chamber-line);border-radius:10px;overflow:hidden}
.seg button{
  min-height:44px;padding:0 18px;font-size:13px;font-weight:500;color:var(--chamber-dim);
  background:#12151b;letter-spacing:.04em;
}
.seg button + button{border-left:1px solid var(--chamber-line)}
.seg button[aria-pressed="true"]{background:#1D232E;color:#EAEDF2}
.toggle{
  display:inline-flex;align-items:center;gap:10px;min-height:44px;padding:0 14px;
  font-size:13px;color:var(--chamber-dim);
}
.toggle .tk{
  width:36px;height:20px;border-radius:999px;border:1px solid var(--chamber-line);
  background:#12151b;position:relative;transition:background .2s;
}
.toggle .tk::after{
  content:"";position:absolute;top:2.5px;left:3px;width:13px;height:13px;border-radius:50%;
  background:var(--chamber-dim);transition:transform .2s,background .2s;
}
.toggle[aria-pressed="true"]{color:#EAEDF2}
.toggle[aria-pressed="true"] .tk{background:#123A52}
.toggle[aria-pressed="true"] .tk::after{transform:translateX(16px);background:var(--c)}
.slider{display:inline-flex;align-items:center;gap:12px;min-height:44px;color:var(--chamber-dim);font-size:13px}
.slider input{width:130px;accent-color:var(--c)}

/* ---- probe (color checker) ---- */
.probe{border-top:1px solid var(--chamber-line);padding:18px 20px 24px;background:var(--chamber)}
.probe__grid{display:grid;grid-template-columns:1fr;gap:16px}
@media(min-width:760px){.probe__grid{grid-template-columns:280px 1fr}}
.probe__title{font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--chamber-dim);text-transform:uppercase;margin-bottom:12px}
.probe__pick{display:flex;align-items:center;gap:14px}
.probe__pick input[type="color"]{
  width:64px;height:44px;border:1px solid var(--chamber-line);border-radius:8px;
  background:#12151b;padding:4px;cursor:pointer;
}
.probe__hex{font-family:var(--mono);font-size:15px;color:#EAEDF2;letter-spacing:.05em}
.probe__coords{font-family:var(--mono);font-size:11.5px;color:var(--chamber-dim);line-height:2;margin-top:10px}
.probe__coords b{color:#EAEDF2;font-weight:500}
.verdicts{display:grid;gap:8px}
.verdict{
  display:flex;align-items:center;gap:12px;min-height:44px;padding:4px 14px;
  border:1px solid var(--chamber-line);border-radius:8px;background:#12151b;font-size:13px;
}
.verdict .swatch{width:9px;height:9px;border-radius:50%;flex:none}
.verdict .name{flex:1;color:var(--chamber-txt)}
.verdict .mark{font-family:var(--mono);font-size:12px;letter-spacing:.05em}
.verdict.in .mark{color:#5AD08A}
.verdict.out .mark{color:#FF7A9C}
.verdict .note{font-size:10.5px;color:var(--chamber-dim);font-family:var(--mono)}
.probe__hint{margin-top:14px;font-size:11.5px;color:var(--chamber-dim);line-height:1.8}
.filebtn{
  display:inline-flex;align-items:center;gap:9px;min-height:44px;padding:0 18px;margin-top:2px;
  border:1px dashed #3A4150;border-radius:8px;background:#12151b;color:var(--chamber-txt);
  font-size:13px;font-weight:500;cursor:pointer;transition:border-color .2s;
}
.filebtn:hover{border-color:var(--c)}
.filebtn::before{content:"⤒";font-family:var(--mono);color:var(--c)}
.probe__status{margin-top:10px;font-size:11px;line-height:1.8;color:var(--chamber-dim)}
.probe__status.ok{color:#5AD08A}
.probe__status.err{color:#FF7A9C}

/* ---- article ---- */
.article{padding:clamp(48px,8vw,96px) 0 0}
.sec{padding:clamp(36px,6vw,64px) 0}
.sec__eyebrow{
  display:flex;align-items:center;gap:12px;margin-bottom:18px;
  font-family:var(--mono);font-size:11px;letter-spacing:.24em;color:var(--ink-2);text-transform:uppercase;
}
.sec__eyebrow::after{content:"";flex:1;height:1px;background:var(--line)}
.sec h2{
  font-family:var(--serif);font-weight:700;font-size:clamp(22px,4vw,30px);
  line-height:1.6;letter-spacing:.05em;margin-bottom:22px;
}
.sec h3{
  font-size:16.5px;font-weight:700;letter-spacing:.04em;
  margin:34px 0 12px;padding-left:14px;border-left:3px solid var(--ink);
}
.sec p{margin-bottom:1.2em;text-align:justify}
.sec p.small{font-size:13px;color:var(--ink-2)}
.kw{background:linear-gradient(transparent 68%, rgba(0,159,232,.22) 68%);font-weight:700;padding:0 1px}

/* ---- mixing demos ---- */
.mixgrid{display:grid;grid-template-columns:1fr;gap:20px;margin:26px 0}
@media(min-width:680px){.mixgrid{grid-template-columns:1fr 1fr}}
.mixcard{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.mixcard__stage{height:230px;position:relative;display:grid;place-items:center}
.mixcard__stage--add{background:#0B0C0F}
.mixcard__stage--sub{background:#FDFDFB}
.mix{position:relative;width:170px;height:150px}
.mix i{position:absolute;width:104px;height:104px;border-radius:50%}
.mix--add i{mix-blend-mode:screen}
.mix--sub i{mix-blend-mode:multiply}
.mix i:nth-child(1){left:33px;top:0}
.mix i:nth-child(2){left:0;top:52px}
.mix i:nth-child(3){left:66px;top:52px}
.mix--add i:nth-child(1){background:#FF0000}
.mix--add i:nth-child(2){background:#00FF00}
.mix--add i:nth-child(3){background:#0000FF}
.mix--sub i:nth-child(1){background:#00FFFF}
.mix--sub i:nth-child(2){background:#FF00FF}
.mix--sub i:nth-child(3){background:#FFFF00}
.mixcard__body{padding:18px 20px 20px;border-top:1px solid var(--line)}
.mixcard__body h4{font-size:15px;letter-spacing:.05em;margin-bottom:8px;font-weight:700}
.mixcard__body h4 span{font-family:var(--mono);font-size:11px;color:var(--ink-2);margin-left:10px;letter-spacing:.1em}
.mixcard__body p{font-size:13px;line-height:1.95;color:var(--ink-2);text-align:justify}

/* ---- complementary wheel ---- */
.comp{display:grid;grid-template-columns:1fr;gap:24px;align-items:center;margin:26px 0}
@media(min-width:760px){.comp{grid-template-columns:340px 1fr}}
.comp__wheelbox{border:1px solid var(--line);border-radius:12px;background:#fff;padding:18px}
.comp__wheel{width:100%;max-width:300px;margin:0 auto;touch-action:manipulation}
.comp__wheel .node{cursor:pointer}
.comp__wheel .node circle.hit{fill:transparent}
.comp__wheel .node circle.face{stroke:#fff;stroke-width:2.5;transition:opacity .25s, r .25s}
.comp__wheel .node text{
  font-family:var(--mono);font-size:13px;font-weight:600;fill:#fff;
  text-anchor:middle;dominant-baseline:central;pointer-events:none;
}
.comp__wheel .node.dim circle.face{opacity:.18}
.comp__wheel .node.dim text{opacity:.25}
.comp__wheel .axis{stroke:#C9C6BD;stroke-width:1.2;transition:opacity .25s,stroke .25s}
.comp__wheel .axis.hot{stroke:var(--ink);stroke-width:2}
.comp__wheel .axis.dim{opacity:.15}
.comp__readout{border:1px solid var(--line);border-radius:12px;background:#fff;padding:22px 24px}
.comp__pair{font-family:var(--mono);font-size:13px;letter-spacing:.08em;color:var(--ink-2);margin-bottom:10px}
.comp__pair b{color:var(--ink);font-size:16px}
.comp__text{font-size:13.5px;line-height:2;color:var(--ink);text-align:justify}
.comp__swatches{display:flex;gap:0;margin-top:16px;border:1px solid var(--line);border-radius:8px;overflow:hidden;height:38px}
.comp__swatches i{flex:1}

/* ---- colour-space cards ---- */
.cs-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:24px 0}
@media (max-width:860px){.cs-grid{grid-template-columns:1fr}}
.cs-card{border:1px solid var(--line);border-radius:12px;background:#fff;padding:18px 20px 16px;display:flex;flex-direction:column;gap:12px}
.cs-card__head{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.cs-card__head i{width:10px;height:10px;border-radius:50%;flex:none}
.cs-card__head b{font-size:15px}
.cs-card__wp{margin-left:auto;font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:var(--ink-2);border:1px solid var(--line);border-radius:99px;padding:3px 10px;white-space:nowrap}
.cs-card__chips{display:flex;flex-wrap:wrap;gap:6px}
.cs-chip{font-family:var(--mono);font-size:11px;color:var(--ink-2);background:var(--paper-2);border:1px solid var(--line);border-radius:7px;padding:5px 9px;white-space:nowrap}
.cs-chip b{color:var(--ink);font-weight:700;margin-right:5px}
.cs-card__desc{font-size:13px;line-height:1.9;color:var(--ink);margin:0}
/* ---- table (legacy) ---- */
.tblwrap{overflow-x:auto;margin:24px 0;border:1px solid var(--line);border-radius:12px;background:#fff}
table{border-collapse:collapse;width:100%;min-width:640px;font-size:12.5px}
th,td{padding:11px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;line-height:1.7}
thead th{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-2);background:var(--paper-2);font-weight:500;white-space:nowrap;
}
tbody tr:last-child td{border-bottom:none}
td.mono,th.mono{font-family:var(--mono);font-size:11.5px;white-space:nowrap;color:var(--ink-2)}
td .sp{display:inline-flex;align-items:center;gap:8px;font-weight:700;white-space:nowrap}
td .sp i{width:9px;height:9px;border-radius:50%;flex:none}

/* ---- honesty / method ---- */
.method{border:1px solid var(--ink);border-radius:12px;background:#fff;padding:26px 24px;margin-top:8px}
.method__head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.method__head h3{margin:0;padding:0;border:none;font-size:16px}
.method ul{list-style:none}
.method li{
  position:relative;padding-left:20px;margin-bottom:12px;
  font-size:13.5px;line-height:1.95;color:var(--ink);text-align:justify;
}
.method li::before{content:"—";position:absolute;left:0;color:var(--ink-2)}
.method li b{background:linear-gradient(transparent 68%, rgba(228,0,127,.16) 68%)}

/* ---- FAQ ---- */
.faq details{border-bottom:1px solid var(--line)}
.faq details:first-of-type{border-top:1px solid var(--line)}
.faq summary{
  list-style:none;display:flex;align-items:center;gap:14px;min-height:56px;
  padding:10px 4px;cursor:pointer;font-weight:700;font-size:14.5px;letter-spacing:.03em;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary .q{font-family:var(--mono);color:var(--c);font-size:12px;flex:none}
.faq summary::after{content:"+";margin-left:auto;font-family:var(--mono);color:var(--ink-2);font-size:16px;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq .a{padding:2px 4px 20px 34px;font-size:13.5px;line-height:2;color:var(--ink-2);text-align:justify}

/* ---- footer ---- */
.footer{margin-top:clamp(48px,8vw,80px);border-top:1px solid var(--ink);background:var(--paper-2)}
.footer__in{display:flex;flex-wrap:wrap;gap:14px 28px;align-items:center;padding:26px 20px;max-width:900px;margin:0 auto}
.footer__name{font-family:var(--serif);font-weight:700;letter-spacing:.08em}
.footer__note{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;color:var(--ink-2);line-height:1.9}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none !important;animation:none !important}
}

/* ---- footer links ---- */
.footer__links{
  flex:0 0 100%;display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--ink-2);
}
.footer__links a{
  text-decoration:none;border-bottom:1px solid var(--line);padding-bottom:1px;
  transition:border-color .2s,color .2s;
}
.footer__links a:hover{color:var(--ink);border-color:var(--ink)}
.footer__links span{color:var(--line)}

/* ---- doc page (license) ---- */
.doc-main{max-width:760px;margin:0 auto;padding:clamp(40px,7vw,72px) 20px clamp(40px,7vw,64px)}
.doc-kicker{
  display:flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-2);
}
.doc-kicker::after{content:"";flex:1;height:1px;background:var(--line)}
.doc-main h1{
  font-family:var(--serif);font-weight:900;
  font-size:clamp(26px,5vw,38px);line-height:1.5;letter-spacing:.05em;
  margin:14px 0 20px;
}
.doc-main h2{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(19px,3.4vw,24px);line-height:1.6;letter-spacing:.05em;
  margin:46px 0 14px;
}
.doc-main p{margin-bottom:1.1em;font-size:14px;text-align:justify}
.doc-main table{min-width:560px}
.doc-main code{
  font-family:var(--mono);font-size:11.5px;background:var(--paper-2);
  border:1px solid var(--line);border-radius:5px;padding:2px 6px;white-space:nowrap;
}
.doc-main a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--c);text-underline-offset:3px}
.doc-main a:hover{text-decoration-thickness:2px}