:root{font-family:"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;font-synthesis:none;color:#161616;background:#fff;--ink:#161616;--muted:#666;--line:#dedede;--accent:#161616}
*{box-sizing:border-box}body{margin:0;line-height:1.6;letter-spacing:.025em}button,input,select{font:inherit;color:inherit;letter-spacing:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;transition:background .15s,border-color .15s}button:disabled{cursor:not-allowed;color:#767676;background:#f7f7f7;border-color:#e5e5e5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid #161616;outline-offset:4px}[hidden]{display:none!important}
.topbar,.workspace{width:calc(100% - 96px);max-width:1632px;margin:0 auto}.topbar{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));min-height:112px;border:1px solid var(--line);border-top:0}.topbar>*{min-width:0;display:flex;align-items:center;padding:32px 36px}.topbar>*+*{border-left:1px solid var(--line)}.brand{gap:15px;text-decoration:none;color:var(--ink)}.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:26px;height:30px;font-size:30px;line-height:1}.brand strong{font-size:20px;font-weight:400;letter-spacing:.18em;white-space:nowrap}.brand-en{font-size:12px;letter-spacing:.24em;margin-left:5px}.top-title{font-size:14px;letter-spacing:.13em}.privacy{font-size:12px;color:#555;letter-spacing:.08em}
.workspace{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);border:1px solid var(--line);border-top:0;margin-bottom:48px}.controls{border-right:1px solid var(--line);min-width:0}.controls section{padding:36px}.controls section+section{border-top:1px solid var(--line)}.section-heading{display:flex;align-items:baseline;gap:20px;margin-bottom:28px;text-transform:uppercase}.section-heading h1,.section-heading h2{font-size:15px;font-weight:400;letter-spacing:.09em;margin:0}.step{font-size:12px;letter-spacing:.1em;color:#666;font-variant-numeric:tabular-nums}
.upload{position:relative;min-height:172px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:13px;padding:24px 12px;border:1px solid var(--line);cursor:pointer;text-align:center;background:#fff}.upload:hover,.upload.dragging{border-color:#161616;background:#fafafa}.upload:focus-within{outline:2px solid #161616;outline-offset:4px}.upload input{position:absolute;width:1px;height:1px;opacity:0}.upload-symbol{font-size:26px;line-height:1;font-weight:300}.upload strong{font-size:13px;font-weight:400;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.upload>span:last-of-type{font-size:12px;color:var(--muted)}
.text-button{display:flex;align-items:center;justify-content:space-between;width:100%;border:0;background:transparent;padding:15px 0;font-size:12px;text-align:left}.text-button:hover:not(:disabled){text-decoration:underline;text-underline-offset:5px}.text-button:disabled{background:transparent}.source-info,.hint,.export-info{font-size:12px;color:var(--muted);line-height:1.9;overflow-wrap:anywhere}.source-info{margin:0}.hint{margin:14px 0 0}.topology-hint{margin:-8px 0 25px}
.field{display:flex;flex-direction:column;gap:11px;font-size:13px;margin-bottom:22px;min-width:0}.field select,.field input[type=number]{width:100%;min-width:0;min-height:44px;border:1px solid #d7d7d7;border-radius:0;padding:10px 12px;background:#fff;font-size:13px}.field select:disabled,.field input:disabled{background:#f7f7f7;color:#777}.field input::placeholder{color:#777}.range-label{display:grid;grid-template-columns:1fr auto;gap:15px;margin-top:28px}.range-label output{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}.range-label input{grid-column:1/-1;width:100%;margin:0;accent-color:#222;cursor:pointer;height:18px}
.primary,.download{display:flex;align-items:center;justify-content:center;gap:12px;width:100%;min-height:46px;padding:12px 16px;border:1px solid #161616;border-radius:0;background:#fff;color:#161616;font-size:13px;font-weight:400;letter-spacing:.08em}.primary:hover:not(:disabled),.download:hover:not(:disabled){background:#f2f2f2;border-color:#161616}.primary:disabled,.download:disabled{color:#767676;background:#f7f7f7;border-color:#e5e5e5}.download{justify-content:space-between}.cancel{justify-content:center;text-align:center}
.size-options{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1px solid #d7d7d7}.size-options button{border:0;background:#fff;padding:12px 2px;min-width:0;font-size:12px;color:#555}.size-options button+button{border-left:1px solid #d7d7d7}.size-options button[aria-pressed=true]{color:#161616;box-shadow:inset 0 -2px #161616}.size-options button:hover:not(:disabled){background:#f5f5f5}.size-options button:disabled{background:#f7f7f7;color:#888}.field-row{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:14px}.export-info{margin:0 0 22px;font-variant-numeric:tabular-nums}#cell-info{padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:#444}
.stage-area{min-width:0}.stage-toolbar,.scale-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 36px}.stage-toolbar{padding:29px 0 22px;border-bottom:1px solid var(--line)}.view-tabs{display:inline-flex;align-items:center;gap:24px}.view-tabs button{border:0;border-bottom:1px solid transparent;padding:8px 0;font-size:13px;background:#fff;color:#666;white-space:nowrap}.view-tabs button[aria-pressed=true]{color:#161616;border-bottom-color:#161616}.view-tabs button:hover{border-bottom-color:#999}.preview-controls{display:flex;align-items:center;gap:10px;font-size:12px;color:#555}.preview-controls select{padding:6px 8px;border:1px solid #d7d7d7;background:#fff;border-radius:0;font-size:12px}.grid-label{display:flex;align-items:center;gap:6px;margin-left:8px;white-space:nowrap}.grid-label input{accent-color:#161616;width:13px;height:13px}.scale-toolbar{padding:22px 0 12px}.subtle{border:1px solid #d7d7d7;border-radius:0;background:#fff;padding:8px 11px;font-size:12px;color:#444}.subtle:hover{border-color:#161616}.scale-state{font-size:12px;color:var(--muted);line-height:1.8;margin:0 36px 26px}
.canvas-stage{height:clamp(380px,47vw,690px);min-height:380px;position:relative;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden;display:flex;align-items:center;justify-content:center}.canvas-stage canvas{display:block;width:100%;height:100%;object-fit:contain}.canvas-stage.actual{cursor:grab;touch-action:none}.canvas-stage.actual:active{cursor:grabbing}#preview{touch-action:auto}.actual #preview{touch-action:none}.empty-state{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#fff;color:#161616;text-align:center;padding:32px}.empty-mark{font-size:46px;line-height:1;font-weight:300}.empty-state h2{font-size:clamp(20px,2vw,28px);font-weight:300;letter-spacing:.18em;margin:32px 0 18px}.empty-state p{font-size:13px;color:var(--muted);margin:0}.empty-upload{border:1px solid #333;border-radius:0;padding:12px 25px;background:#fff;font-size:12px;margin-top:32px;letter-spacing:.08em}.empty-upload:hover{background:#f5f5f5}.stage-caption{position:absolute;bottom:0;left:0;right:0;display:flex;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding:12px 22px;background:#fff;color:#555;font-size:12px;letter-spacing:.035em;pointer-events:none;text-transform:uppercase}
.origin-row{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin:22px 36px 0;font-size:12px;color:#555}.origin-row label{display:flex;align-items:center;gap:7px}.origin-row input{width:82px;border:1px solid #d7d7d7;border-radius:0;padding:7px;background:#fff;font-size:12px}.result-bar{display:flex;align-items:baseline;justify-content:space-between;gap:25px;padding:30px 36px}.status-label{font-size:13px;font-weight:400;letter-spacing:.08em}.status-block{min-width:0}.status-block p{font-size:12px;color:var(--muted);line-height:1.9;margin:12px 0 0;overflow-wrap:anywhere}.result-mode{font-size:12px;color:#555;flex-shrink:0}.progress-area{display:flex;align-items:center;gap:16px;margin:0 36px 30px}.progress-area progress{appearance:none;height:3px;width:100%;border:0}.progress-area progress::-webkit-progress-bar{background:#eee}.progress-area progress::-webkit-progress-value{background:#222}.progress-area span{font-size:12px;color:var(--muted);min-width:36px}.notice{border:1px solid #777;background:#fafafa;color:#333;margin:0 36px 30px;padding:16px 20px;font-size:13px;line-height:1.8}.small-label{font-size:14px;font-weight:400;letter-spacing:.08em;text-transform:uppercase}
.proof-panel{border-top:1px solid var(--line);padding:36px}.proof-heading{display:flex;justify-content:space-between;gap:20px;align-items:baseline}.proof-heading p{font-size:12px;color:var(--muted);line-height:1.9;margin:15px 0 28px}.proof-badge{font-size:12px;color:#555;white-space:nowrap;border-bottom:1px solid #999;padding-bottom:4px}.proof-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:end;gap:24px}.proof-actions .field{margin:0}.proof-actions button{min-height:44px;font-size:12px;padding:11px 8px}.print-instruction{font-size:12px;color:#555;line-height:1.9;border-top:1px solid var(--line);padding:22px 0;margin:24px 0 0}.proof-panel details{border-top:1px solid var(--line);padding-top:20px}.proof-panel summary{font-size:12px;cursor:pointer;color:#333}.measure-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;margin-top:24px}.measure-row .field{margin:0}
dialog{max-width:500px;width:calc(100% - 40px);border:1px solid #333;border-radius:0;padding:32px;color:#161616;background:#fff}dialog::backdrop{background:#ffffffb8}.dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:18px;padding-bottom:22px;border-bottom:1px solid var(--line)}.dialog-heading h2{font-size:18px;font-weight:400;letter-spacing:.06em;margin:0}dialog p{font-size:13px;line-height:1.9;color:#555;margin:22px 0}.calibration-track{padding:24px 8px 30px;overflow:hidden}
/* Preserve the orange functional cue named in the existing calibration instructions. */
#calibration-line{width:min(300px,100%);height:2px;background:#dc7442;position:relative}#calibration-line:before,#calibration-line:after{content:'';position:absolute;top:-8px;height:18px;width:1px;background:#dc7442}#calibration-line:before{left:0}#calibration-line:after{right:0}
@media(min-width:1700px){.controls section,.proof-panel{padding:44px}.topbar>*{padding-left:44px;padding-right:44px}}
@media(max-width:1200px){.topbar,.workspace{width:calc(100% - 48px)}.topbar>*,.controls section,.proof-panel{padding:28px 24px}.brand{gap:10px}.brand-en{letter-spacing:.16em}.stage-toolbar,.scale-toolbar{margin-left:24px;margin-right:24px;gap:12px;flex-wrap:wrap}.scale-state{margin-left:24px;margin-right:24px}.view-tabs{gap:20px}.preview-controls{gap:8px}.preview-controls>label:first-child{display:none}.origin-row{margin-left:24px;margin-right:24px}.result-bar{padding:26px 24px;gap:16px}.progress-area,.notice{margin-left:24px;margin-right:24px}.stage-caption{padding:10px 15px;flex-wrap:wrap;gap:3px 14px}.proof-actions{gap:16px}}
@media(max-width:900px){.workspace{grid-template-columns:minmax(250px,1fr) minmax(0,2fr)}.topbar>*,.controls section,.proof-panel{padding-left:20px;padding-right:20px}.brand-en{display:none}.top-title{font-size:13px}.field-row{gap:10px;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.field select,.field input[type=number]{padding:10px 8px}.stage-toolbar,.scale-toolbar{margin-left:20px;margin-right:20px}.scale-state{margin-left:20px;margin-right:20px}.scale-toolbar .view-tabs{gap:18px}.canvas-stage{height:440px}.result-bar{flex-wrap:wrap;gap:8px}.proof-actions{grid-template-columns:1fr;gap:20px}.proof-actions button{min-height:46px}}
@media(max-width:700px){.topbar,.workspace{width:calc(100% - 32px)}.topbar{min-height:88px}.topbar>*{padding:20px 12px}.brand{gap:6px}.brand-mark{width:20px;font-size:24px}.brand strong{font-size:16px;letter-spacing:.1em}.top-title,.privacy{font-size:12px;letter-spacing:.04em}.workspace{display:flex;flex-direction:column;margin-bottom:24px}.controls{display:contents}.controls section{padding:28px 24px}.controls section:first-child{order:0}.controls section:nth-child(2){order:1}.stage-area{order:2;border-top:1px solid var(--line)}.controls .export-section{order:3}.section-heading{margin-bottom:24px}.upload{min-height:145px}.field{margin-bottom:22px}.field-row{gap:16px;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr)}.stage-toolbar,.scale-toolbar{margin-left:24px;margin-right:24px}.stage-toolbar{padding:22px 0;gap:16px}.scale-toolbar{padding-top:22px;gap:16px}.preview-controls{gap:10px}.scale-state{margin:4px 24px 24px}.canvas-stage{height:440px;min-height:320px}.stage-caption{display:block;padding:10px 16px;line-height:1.8}.stage-caption span{display:block}.result-bar{padding:28px 24px}.proof-panel{padding:28px 24px}.proof-heading{align-items:start;gap:12px}.measure-row{gap:16px}.origin-row>span{width:100%}dialog{padding:26px 24px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
.range-label input{appearance:none;-webkit-appearance:none;background:transparent}.range-label input::-webkit-slider-runnable-track{height:1px;background:#999}.range-label input::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:9px;height:9px;border:1px solid #161616;border-radius:50%;background:#161616;margin-top:-4px}.range-label input::-moz-range-track{height:1px;background:#999}.range-label input::-moz-range-thumb{width:8px;height:8px;border:1px solid #161616;border-radius:50%;background:#161616}
.canvas-stage{border-bottom:0}.stage-caption{position:static;min-height:39px;border-bottom:1px solid var(--line);line-height:1.5;padding-top:9px;padding-bottom:9px}

.scale-toolbar .preview-modes{display:flex;flex-wrap:wrap;column-gap:20px;row-gap:8px;min-width:0}.preview-modes button:disabled{background:#fff;color:#888;cursor:not-allowed}.preview-controls input:disabled{cursor:not-allowed}.comparison{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%;height:100%;min-height:0}.comparison figure{display:flex;flex-direction:column;margin:0;min-width:0;min-height:0}.comparison figure+figure{border-left:1px solid var(--line)}.comparison figcaption{font-size:12px;letter-spacing:.06em;color:#444;padding:16px 24px;border-bottom:1px solid var(--line);flex-shrink:0}.comparison canvas{display:block;width:100%;height:0;flex:1;min-height:0;object-fit:contain}.quality-note{font-size:12px;line-height:1.9;color:var(--muted);padding:0 36px 28px;margin:0}.canvas-stage:has(.comparison:not([hidden])){cursor:default}
@media(max-width:1200px){.quality-note{padding-left:24px;padding-right:24px}}@media(max-width:700px){.comparison{grid-template-columns:1fr;grid-template-rows:repeat(2,minmax(0,1fr))}.comparison figure+figure{border-left:0;border-top:1px solid var(--line)}.comparison figcaption{padding:10px 20px}.scale-toolbar .preview-modes{column-gap:18px;row-gap:8px}}

/* Sampled reference colors, distributed once so each control keeps its identity. */
#topology,#fit-view{--option-fill:#d3d7bb}
#format,#input-view,#empty-upload{--option-fill:#ccd4c8}
[data-size="8000"],#origin-reset,#calibration-form button[type="submit"]{--option-fill:#d2d7ab}
[data-size="original"],#view-result{--option-fill:#96bba5}
#method,#actual-view{--option-fill:#98b1b3}
#process{--option-fill:#171717;--option-ink:#fff}
#repeat,#calibrate{--option-fill:#b7aea1}
#direction,#download{--option-fill:#b4a19f}
[data-size="6000"],#download-proof{--option-fill:#ba9bac}
[data-size="12000"],#compare-view{--option-fill:#b7b2d8}
#layout,#view-original{--option-fill:#d5cfd8}
#paper{--option-fill:#c5c3d9}
:is(.field select,.preview-controls select,.size-options button,.view-tabs button,.primary,.download,#calibrate,#origin-reset,#empty-upload):not(:disabled){background:var(--option-fill);color:var(--option-ink,#161616);border-color:var(--option-fill)}
.view-tabs button:not(:disabled){position:relative;isolation:isolate}
.view-tabs button:not(:disabled)::before{content:'';position:absolute;inset:0 -6px;background:var(--option-fill);z-index:-1;pointer-events:none}
:is(.size-options,.view-tabs) button[aria-pressed="true"]:not(:disabled){box-shadow:inset 0 -2px currentColor}
.view-tabs button[aria-pressed="true"]:not(:disabled){border-bottom-color:currentColor}
:is(.field select,.preview-controls select,.size-options button,.primary,.download,#calibrate,#origin-reset,#empty-upload):hover:not(:disabled){border-color:currentColor}
.view-tabs button:hover:not(:disabled){border-bottom-color:currentColor}
.view-tabs button:hover:not(:disabled)::before{box-shadow:inset 0 -1px currentColor}
.view-tabs button[aria-pressed="true"]:not(:disabled)::before{box-shadow:inset 0 -2px currentColor}