:root{--green:#167761;--ink:#244239;--muted:#667b72;--gold:#efc45f;--paper:#fafbf5;--line:#d9e5dc}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",sans-serif}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:9px;padding:9px 15px;min-height:40px}button:hover{background:#eaf5ef;border-color:#a4c9b8}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #d6a63c;outline-offset:3px}button.primary,button.active{background:var(--green);color:white;border-color:var(--green)}button[hidden],[hidden]{display:none!important}header{max-width:1580px;margin:auto;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:22px 32px 10px;gap:20px}.back{color:var(--green);text-decoration:none;font-size:14px;justify-self:start}.heading{text-align:center}.heading p{font-size:12px;letter-spacing:5px;color:var(--green);font-weight:700;margin:0 0 7px}.heading h1{font-size:27px;letter-spacing:2px;margin:0}.header-actions{display:flex;justify-content:flex-end;gap:8px}.header-actions button{font-size:13px;background:transparent}main{max-width:1540px;margin:auto;padding:0 28px 18px}.tabs{display:flex;justify-content:center;gap:9px;margin:7px 0 20px}.tabs button{padding:8px 24px;font-size:14px;border-radius:24px;min-height:36px}.number-area{background:linear-gradient(120deg,#edf8ef,#f8fbf2);border:1px solid #dbe9dc;border-radius:15px;padding:14px 16px 12px}.control-line{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:16px;font-size:13px;min-height:38px}.control-line label{display:flex;gap:9px;align-items:center}.control-line input,.control-line select{border:1px solid #cedfd3;background:#fff;border-radius:8px;padding:8px 10px;color:var(--ink);max-width:260px}.control-line input{width:180px;font:600 22px ui-monospace,Consolas,monospace;letter-spacing:3px}.control-line button{font-size:13px;padding:7px 13px;min-height:36px}.example-mark{color:var(--green);font-size:12px;border-left:3px solid var(--green);padding-left:8px}.quiet{margin-left:auto;color:#789080;font-size:12px}.code-scroll{overflow-x:auto;padding:3px 2px 10px;scrollbar-width:thin;scrollbar-color:#b2cebd transparent}#codeBoard{min-width:900px}.labels,.digits{display:grid;grid-template-columns:repeat(18,minmax(0,1fr));gap:6px}.labels{margin-bottom:7px}.labels button{border:0;border-radius:0;border-bottom:2px solid #a7caba;background:transparent;min-height:35px;padding:0 0 6px;color:#537166;font-size:14px;letter-spacing:2px}.labels button:hover{color:var(--green);border-color:var(--green)}.digit{height:57px;min-width:0;padding:0;font:700 33px ui-monospace,Consolas,monospace;border:1px solid #e2e9df;border-radius:9px;color:#243c33;background:#fff;transition:background .16s,color .16s,box-shadow .16s}.digit:hover{box-shadow:0 0 0 2px #e4bd57}.digit.lit{background:var(--green);color:white;border-color:var(--green)}.digit.recent{box-shadow:0 0 0 3px #edcf7c}.reading{display:flex;align-items:center;gap:12px;border:1px solid #a3c8b4;border-radius:9px;background:#ffffffd9;padding:11px 14px;min-height:62px}.reading>span{background:#e9f3ea;color:var(--green);padding:5px 9px;border-radius:5px;font-size:12px;white-space:nowrap;font-weight:700}.reading p{margin:0;line-height:1.7;font-size:15px;flex:1}.reading strong{color:#a57510}.reading button{font-size:12px;white-space:nowrap}.map-section{background:white;border:1px solid var(--line);border-radius:14px;overflow:hidden;margin-top:17px}.map-heading{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;gap:12px}.map-heading p{margin:0 0 5px;font-size:12px;color:var(--muted);letter-spacing:1px}.map-heading h2{font-size:21px;margin:0;letter-spacing:.6px}.map-heading h2 strong{color:#ab7c16}.map-actions{display:flex;gap:8px;flex-shrink:0}.map-actions button{font-size:13px}.map-stage{height:clamp(380px,49vh,660px);min-height:380px;background:#edf1f0;position:relative;overflow:hidden}.map-stage svg{display:block;width:100%;height:100%;touch-action:none;cursor:grab}.map-stage svg:active{cursor:grabbing}.map-status{position:absolute;left:50%;top:46%;transform:translate(-50%,-50%);max-width:80%;background:#fffffff0;padding:16px 24px;border-radius:10px;text-align:center;line-height:1.8;color:#5b7068;pointer-events:none}.map-legend{position:absolute;left:17px;bottom:14px;display:flex;gap:16px;background:#fffffff0;padding:8px 11px;border-radius:7px;font-size:12px;color:#5d7268;pointer-events:none}.map-legend i{display:inline-block;width:11px;height:11px;background:var(--gold);margin-right:6px;border:1px solid #ceab55}.map-legend span+span i{background:#e0e8e2;border-color:#9caea3}.map-zoom{position:absolute;right:15px;bottom:15px;display:flex;gap:5px}.map-zoom button{font-size:21px;padding:3px 13px}.map-footer{display:flex;justify-content:space-between;gap:18px;padding:10px 18px;font-size:12px;color:var(--muted);line-height:1.6}.map-footer p{margin:0}#locationTrail{font-weight:700;color:var(--green);white-space:nowrap}.lesson-footer{display:flex;justify-content:space-between;align-items:center;padding:12px 3px 0;font-size:12px;color:var(--muted)}.lesson-footer button{border:0;background:transparent;min-height:30px;font-size:12px;padding:5px}.postal #codeBoard{min-width:0;max-width:480px;margin:0 auto}.postal .labels,.postal .digits{grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}.postal .digit{height:64px}.postal .control-line{justify-content:center}.postal .map-stage{height:clamp(400px,55vh,720px)}.mobile-hint{display:none}dialog{width:min(740px,calc(100% - 30px));max-height:85dvh;border:1px solid #b8d1c3;border-radius:17px;padding:25px;color:var(--ink);box-shadow:0 24px 90px #193d3330;background:var(--paper)}dialog::backdrop{background:#1d3b3655;backdrop-filter:blur(3px)}.dialog-top{display:flex;align-items:center;justify-content:space-between;gap:15px}.dialog-top h2{font-size:22px;margin:0}.dialog-top button{font-size:24px;border:0;padding:0 8px;background:transparent}dialog p{line-height:1.85;font-size:14px}dialog h3{font-size:16px;margin-top:24px}dialog a{color:var(--green);text-underline-offset:3px}.dialog-note{color:var(--muted);font-size:12px!important}#identityForm{display:grid;gap:12px}#identityForm label{font-size:13px}#identityInput{font:600 24px ui-monospace,Consolas,monospace;letter-spacing:2px;padding:13px;width:100%;border:1px solid #b3cdbd;border-radius:8px}#inputError{color:#a44437;margin:0;min-height:20px}#checkDetail{overflow-x:auto}#checkDetail table{border-collapse:collapse;font:13px ui-monospace,monospace;min-width:570px;width:100%}#checkDetail th,#checkDetail td{border:1px solid var(--line);padding:6px;text-align:center}#checkDetail th{color:var(--green);background:#ebf3eb;white-space:nowrap}.result{padding:12px;background:#e7f2e9;border-radius:8px}.map-label{font-weight:700;paint-order:stroke;stroke:#fff;stroke-width:3px;stroke-linejoin:round;fill:#465e50;pointer-events:none;font-family:"Microsoft YaHei",sans-serif}.map-label.selected{fill:#75500c;stroke:#fff1c8;stroke-width:3.5px}@media(max-width:900px){header{padding:16px;grid-template-columns:auto 1fr auto;gap:10px}.heading h1{font-size:22px}.heading p{letter-spacing:3px}main{padding:0 14px 15px}.header-actions #reset{display:none}.map-stage{height:470px}.quiet{display:none}.map-footer{flex-direction:column;gap:4px}.map-heading h2{font-size:18px}}@media(max-width:600px){header{padding:14px 10px 6px;gap:5px}.back{font-size:12px;max-width:42px}.heading h1{font-size:18px;letter-spacing:0}.heading p{font-size:10px;letter-spacing:2px}.header-actions button{padding:6px 8px;min-height:34px;font-size:12px}main{padding:0 9px 10px}.tabs{margin:10px 0 13px}.tabs button{font-size:13px;padding:7px 19px}.number-area{padding:11px 9px;border-radius:11px}.control-line{gap:8px;margin-bottom:8px}.control-line label{font-size:12px}.control-line select{max-width:205px;padding:8px}.example-mark{display:none}.mobile-hint{display:block;font-size:11px;color:var(--muted);margin:8px 0}.postal .mobile-hint{display:none}.reading{padding:10px;gap:7px;flex-wrap:wrap}.reading p{font-size:13px;min-width:220px}.reading>span{font-size:11px}.reading button{margin-left:auto;min-height:34px}.map-heading{padding:12px 11px;align-items:flex-start}.map-heading h2{font-size:16px;line-height:1.5}.map-heading p{font-size:10px}.map-actions{flex-direction:column;gap:5px}.map-actions button{padding:5px 8px;font-size:11px;min-height:30px}.map-stage,.postal .map-stage{height:400px;min-height:360px}.map-legend{font-size:10px;gap:8px;left:9px;bottom:10px}.map-zoom{right:9px;bottom:10px}.map-footer{padding:9px 11px;font-size:11px}.lesson-footer{font-size:10px}.lesson-footer button{font-size:11px}.postal .control-line input{width:138px;font-size:19px}.postal .labels,.postal .digits{gap:5px}.postal .digit{height:53px;font-size:28px}.postal .labels button{font-size:11px;letter-spacing:0}dialog{padding:18px}.dialog-top h2{font-size:19px}#identityInput{font-size:19px;letter-spacing:1px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* Keep teaching labels reversible without moving the map or changing the digits. */
.postal-results{margin-top:16px;padding:18px 20px;border:1px solid #cedfd3;border-radius:14px;background:#fff}
.postal-result-heading{display:flex;align-items:baseline;gap:12px;justify-content:space-between}.postal-result-heading h3{font-size:19px;margin:0;color:var(--green)}.postal-result-heading>span{font-size:12px;color:var(--muted)}
.postal-data-scope{font-size:11px;color:#7c887e;line-height:1.7;margin:8px 0 13px}.postal-result-controls{display:flex;gap:20px;align-items:center;flex-wrap:wrap}.postal-result-controls label{display:flex;gap:9px;align-items:center;font-size:13px}.postal-result-controls select,.postal-result-controls input{border:1px solid #c9dace;background:#fcfdf9;border-radius:7px;padding:9px;min-height:38px;max-width:100%;color:var(--ink)}.postal-result-controls select{max-width:560px}.postal-result-controls input{width:240px}
.postal-area-note,.postal-places p{font-size:12px;line-height:1.75;color:var(--muted);margin:10px 0}.postal-conflict,.office-conflict{font-size:12px;line-height:1.8;color:#866013;background:#fff7e2;border-left:3px solid #d6ae52;padding:9px 12px}.postal-places{max-height:145px;overflow:auto}.postal-places p{border-left:2px solid #d9e8dd;padding-left:11px}
#postalOfficeCount{font-size:14px;margin:16px 0 10px}.postal-office-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;max-height:390px;overflow-y:auto;padding:2px 4px 3px 1px;scrollbar-color:#b2cebd #f5f8f3;scrollbar-width:thin}.postal-office{border:1px solid #e0e8df;border-radius:9px;padding:13px 14px;background:#fafcf7}.postal-office-heading{display:flex;align-items:flex-start;gap:10px;justify-content:space-between}.postal-office h4{font-size:16px;margin:0;line-height:1.5}.office-status{font-size:10px;background:#e7f1e9;color:#39745c;border-radius:4px;padding:4px 6px;max-width:150px;flex-shrink:0}.office-status.paused{background:#fff0d9;color:#876122}.office-region,.office-dates{font-size:11px;color:var(--muted);line-height:1.7;margin:7px 0}.office-address{font-size:13px;line-height:1.75;margin:7px 0;color:#435d51;overflow-wrap:anywhere}.office-foot{display:flex;gap:10px;align-items:center;justify-content:space-between;margin-top:9px}.office-foot>span{font-size:10px;color:#839186}.office-foot button{font-size:11px;padding:6px 9px;min-height:32px}.office-foot button:disabled{cursor:default;color:#918572;border-color:#e5dfd0;background:#f6f3ec}.office-conflict{font-size:11px;margin:7px 0;padding:7px 9px}.postal-result-sources{display:flex;gap:8px 16px;flex-wrap:wrap;margin-top:13px}.postal-result-sources a,.postal-official-link a{color:var(--green);font-size:11px;text-underline-offset:3px}.postal-official-link{display:flex;gap:10px;flex-wrap:wrap;font-size:11px;color:var(--muted);border-top:1px solid #e2e9de;padding-top:11px;margin:13px 0 0}#postalOfficeEmpty,#postalNotFound{font-size:14px;line-height:1.8;color:var(--muted)}#postalMore{margin-top:9px;font-size:12px}#postalMapOptions{display:flex;flex-wrap:wrap;gap:7px}#postalMapOptions button{font-size:12px}
.postal-explanations-hidden #postalResults{visibility:hidden;pointer-events:none}
@media(max-width:650px){.postal-results{padding:13px 11px}.postal-result-heading{align-items:flex-start;flex-direction:column;gap:6px}.postal-result-heading h3{font-size:16px}.postal-result-heading>span{font-size:11px}.postal-result-controls{gap:10px;display:grid;grid-template-columns:1fr}.postal-result-controls label{display:grid;grid-template-columns:56px minmax(0,1fr);gap:7px;font-size:12px}.postal-result-controls select,.postal-result-controls input{width:100%;min-width:0;max-width:100%;font-size:12px}.postal-office-list{grid-template-columns:1fr;max-height:405px}.postal-office{padding:11px}.postal-office h4{font-size:14px}.office-status{max-width:125px}.office-address{font-size:12px}.postal-data-scope{font-size:10px}}
.legacy-identity .labels,.legacy-identity .digits{grid-template-columns:repeat(15,minmax(0,1fr))}
.format-note{margin:0 0 10px;color:#5f7265;font-size:12px;line-height:1.65}
.history-card{margin-top:14px;padding:16px 18px;background:#fffdf4;border:1px solid #e7dcbb;border-radius:10px}
.history-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}
.history-heading h3{margin:0;font-size:16px;color:#725a1b}.history-heading>span{font-size:11px;color:#8d7c51}
.history-controls{display:flex;align-items:center;gap:14px;flex-wrap:wrap;font-size:12px}.history-controls label{display:flex;align-items:center;gap:9px}.history-controls select{max-width:min(570px,65vw);padding:7px;border:1px solid #d9d4bf;border-radius:6px;color:var(--ink);background:#fff}.history-controls>span{color:#8b8068}
.history-comparison{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1.25fr);gap:18px;margin-top:10px;align-items:start}.history-caption{font-size:12px;color:#8b7650;margin:5px 0 7px}.history-caption span{font-size:10px}.history-place{font-size:17px;font-weight:700;line-height:1.65;margin:0;color:#4f5136;overflow-wrap:anywhere}.history-muted{color:#817a64;font-size:11px;line-height:1.7;margin:6px 0 0}.history-arrow{font-size:25px;color:#b99f5c;margin-top:25px}
.history-destinations{display:flex;gap:7px;flex-wrap:wrap;margin-top:7px}.history-destinations button{font-size:12px;min-height:36px;padding:7px 10px}
.history-caution{font-size:12px;line-height:1.75;margin:12px 0 0;color:#786945}.history-card details{border-top:1px solid #e8e1cb;margin-top:10px;padding-top:9px;font-size:12px;color:#6d715a;line-height:1.8}.history-card summary{cursor:pointer;color:#685b31;min-height:25px}.history-card ul{padding-left:22px;max-height:220px;overflow:auto;overflow-wrap:anywhere}.history-card details p{margin:7px 0}.history-card a{color:var(--green);text-underline-offset:3px}
.explanations-hidden #addressHistory,.explanations-hidden #formatNote{visibility:hidden;pointer-events:none}
@media(max-width:600px){.history-card{padding:12px}.history-heading{align-items:flex-start;gap:7px}.history-heading h3{font-size:14px}.history-heading>span{font-size:10px;white-space:nowrap}.history-controls{gap:6px}.history-controls label{display:block;max-width:100%}.history-controls select{display:block;margin-top:4px;max-width:100%;width:100%}.history-comparison{grid-template-columns:1fr;gap:8px}.history-arrow{display:none}.history-place{font-size:15px}.history-comparison>div+div{border-top:1px solid #e8e1cb;padding-top:8px}.history-caution{font-size:11px}.history-muted{font-size:10px}.format-note{font-size:11px}}
.number-tools{display:flex;align-items:flex-start;gap:12px}
#identityControls .example-mark{display:inline-block}
.details-heading{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:10px 16px}
.details-toggle{font-size:12px;min-height:40px;padding:8px 12px;white-space:nowrap;color:var(--green);border-color:#adcbb9}
.details-toggle::after{content:'⌃';display:inline-block;margin-left:7px;font-size:15px}
.details-toggle[aria-expanded="false"]::after{content:'⌄'}
.details-collapsed>.details-heading{margin-bottom:0}
@media(max-width:650px){.details-heading{grid-template-columns:minmax(0,1fr) auto;gap:5px 10px}.details-heading>span{grid-column:1;grid-row:2;white-space:normal}.details-heading>.details-toggle{grid-column:2;grid-row:1 / span 2}.details-toggle{font-size:12px;padding:8px 10px;min-height:44px}}
.number-tools>.control-line{flex:1;min-width:0}
.number-tools .quiet{display:none}
#toggleExplanations{flex-shrink:0;font-size:13px;color:var(--green);border-color:#adcbb9;background:#ffffffbd;min-height:36px;padding:7px 12px}
.explanations-hidden #codeLabels{visibility:hidden;pointer-events:none}
.reading{position:relative}
.explanations-hidden #readingArea>*{visibility:hidden;pointer-events:none}
.explanations-hidden #readingArea::after{content:'先观察数字，试着说说它们的含义。';position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:10px;color:#6c8477;font-size:13px;pointer-events:none}
@media(max-width:600px){.number-tools{flex-wrap:wrap;gap:6px}.number-tools>.control-line{flex-basis:100%;margin-bottom:0}#toggleExplanations{margin-left:auto;font-size:12px;min-height:34px}}