@charset "UTF-8";
:root{--ink:#234d37;--muted:#718578;--green:#27884b;--line:#dbeade;--paper:#fff;--bg:#f3faf5;--soft:#ebf7ee;font:15px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);color-scheme:light}
*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit;color:inherit}button,a,input,textarea,summary{touch-action:manipulation}button{cursor:pointer;border:1px solid #d4e5d8;background:#fff;border-radius:10px;padding:9px 15px;line-height:1.5}button:hover{background:#edf8ef;border-color:#a8cfb6}button:disabled{opacity:.5;cursor:default}button.primary{background:var(--green);border-color:var(--green);color:#fff;font-weight:600;padding:11px 21px}button.primary:hover{background:#21743f}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #89c49b;outline-offset:3px}a{color:var(--green);text-underline-offset:3px}h1,h2,h3,p{margin:0}h1,h2,h3{font-weight:650}h1{font-size:31px;letter-spacing:-.5px;line-height:1.4}h2{font-size:19px;line-height:1.5}h3{font-size:15px}input[type=text],textarea{width:100%;border:1px solid #cfdfd3;background:#fcfefc;border-radius:10px;padding:11px 13px;min-width:0}textarea{resize:vertical;min-height:178px;line-height:1.85}input::placeholder,textarea::placeholder{color:#99a89b}input[type=checkbox]{accent-color:var(--green)}[hidden]{display:none!important}.muted{color:var(--muted);font-size:12px}.eyebrow{font-size:11px;color:#6f8a76;margin-bottom:3px;letter-spacing:.6px}.badge{display:inline-block;font-size:11px;padding:3px 8px;border:1px solid #dbead9;background:#f3f9f0;border-radius:6px;color:#63806a;white-space:nowrap}.text-button{font-size:11px;border:none;background:transparent;color:var(--green);padding:3px 4px}
.app-header{display:flex;align-items:center;gap:25px;min-height:60px;padding:10px max(24px,calc((100vw - 1456px)/2));border-bottom:1px solid var(--line);background:#fff}.brand{display:flex;align-items:center;gap:8px;font-size:16px;font-weight:650;text-decoration:none;white-space:nowrap}.brand span{display:grid;place-items:center;background:var(--green);color:#fff;border-radius:9px;width:30px;height:30px;font:24px/1 serif}.header-title{flex:1;font-size:15px}.header-title .badge{margin-left:6px}.app-header>a:last-child{font-size:12px;white-space:nowrap}main{max-width:1456px;margin:0 auto;padding:27px 24px 24px}.intro{display:flex;gap:25px;align-items:center;justify-content:space-between;margin-bottom:22px}.intro-copy{font-size:13px;color:var(--muted);margin-top:8px}.service-card{max-width:400px;padding:13px 16px;border:1px solid var(--line);border-radius:12px;background:#ffffff9c}.service-line{display:flex;gap:7px;align-items:center}.service-line strong{font-size:12px;flex:1}.service-line i{width:7px;height:7px;flex-shrink:0;border-radius:50%;background:#a6b9ab}.service-line i.ready{background:#42b975}.service-line i.offline{background:#d9ae67}.service-card>p{font-size:11px;color:var(--muted);margin-top:4px}.notice{padding:13px 17px;border:1px solid #e3e4b5;background:#fcfbef;border-radius:12px;margin-bottom:17px;font-size:12px;line-height:1.9}.notice strong{font-size:13px}.notice code{font-size:11px;overflow-wrap:anywhere}.task-list{display:flex;gap:9px;margin-bottom:17px;flex-wrap:wrap}.task-list button{display:flex;gap:8px;align-items:center;text-align:left;font-size:13px;padding:10px 16px}.task-list button span{font-size:10px;color:#71927b}.task-list button[aria-pressed=true]{background:#e6f6ec;border-color:#75b994;color:#226b42;font-weight:600}.workspace{display:grid;grid-template-columns:minmax(300px,.86fr) minmax(410px,1.14fr);gap:19px;align-items:start}.card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:24px;box-shadow:0 4px 20px #1f6a3a03;min-width:0}.card-heading{display:flex;align-items:center;gap:11px;margin-bottom:20px}.card-heading>div{flex:1;min-width:0}.step-number{display:grid;place-items:center;flex-shrink:0;width:32px;height:32px;border-radius:50%;background:#e8f6eb;font-size:15px;font-weight:650;color:#37804d}.problem-prompt{font-size:15px;line-height:2;white-space:pre-wrap;overflow-wrap:anywhere}.task-diagram{display:grid;place-items:center;min-height:160px;margin:19px 0 7px;background:#f9fcf9;border:1px solid #e9f1e9;border-radius:12px;overflow:hidden}.task-diagram svg{display:block;max-width:100%;width:100%;height:auto;max-height:300px}.task-diagram:empty{min-height:100px}.diagram-note{font-size:10px;color:#839589;text-align:center}.givens{margin:22px 0 0}.givens>div{display:flex;gap:15px;padding:12px 0;border-top:1px solid #e8f1ea;font-size:12px}.givens dt{flex-shrink:0;color:#7b8e7f;width:48px}.givens dd{margin:0;white-space:pre-wrap;overflow-wrap:anywhere}.problem-footer{display:flex;gap:10px;align-items:center;justify-content:space-between;margin-top:19px;padding-top:17px;border-top:1px solid #e9f1eb}.problem-footer p{font-size:11px;color:var(--muted)}.problem-footer button{font-size:11px;white-space:nowrap}.editor-card label:not(.file-button):not(.check-label){display:block;font-size:13px;font-weight:600;margin:18px 0 7px}.editor-card label span{font-weight:400;color:#839489;font-size:11px;margin-left:7px}.input-tip{font-size:11px;color:var(--muted);margin:7px 0 15px}.photo-area{border:1px solid #e1ece1;background:#fcfefb;border-radius:11px;margin:17px 0}.photo-area>summary{cursor:pointer;padding:11px 13px;font-size:12px}.photo-area>summary span{color:#8a9c8c;font-size:10px;float:right}.photo-content{padding:0 13px 14px}.photo-content>.muted{font-size:10px;line-height:1.9}.file-button{display:inline-block;border:1px dashed #a7c4ad;border-radius:8px;padding:7px 13px;margin:10px 0 12px;cursor:pointer;background:#fff;font-size:11px}.file-button input{display:block;max-width:100%;font-size:10px;margin-top:5px}.photo-previews{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.photo-card{position:relative;border:1px solid var(--line);background:#fff;border-radius:9px;padding:7px;min-width:0}.photo-card img{display:block;max-width:100%;width:100%;height:88px;object-fit:contain;border-radius:4px;background:#f4f7f4}.photo-card p{font-size:9px;color:#7c8e7f;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:5px}.photo-card button{position:absolute;top:3px;right:3px;border-radius:50%;padding:0;width:23px;height:23px;font-size:17px;background:#ffffffed;line-height:1}.photo-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:8px}.photo-actions button{font-size:11px}.recognition-options{font-size:11px;line-height:1.9;margin-top:12px;background:#eef7ef;border-radius:8px;padding:9px 11px}.recognition-options button{font-size:10px;padding:5px 8px;margin:5px 6px 0 0}.check-label{display:flex;gap:7px;align-items:flex-start;font-size:11px;margin-top:12px;line-height:1.8}.check-label input{margin:4px 0 0;flex-shrink:0}.recognition-issues{padding:10px;border-radius:8px;background:#fff8e9;color:#8c744b;font-size:11px;margin-top:9px}.recognition-issues p+p{margin-top:4px}.input-message{font-size:12px;line-height:1.85;margin-top:12px;border-radius:9px;padding:10px 12px;background:#fcf6ed;border:1px solid #e7d9be;white-space:pre-wrap;overflow-wrap:anywhere}.input-message.success{background:#eff8f1;border-color:#c7e3cf}.submit-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:20px}.submit-row>p{font-size:11px;flex:1;min-width:110px}.submission-note{font-size:10px;line-height:1.9;color:#839488;margin-top:12px}.result-card{margin-top:22px;padding:25px}.result-heading{display:flex;gap:12px;align-items:center;justify-content:space-between;padding-bottom:18px;border-bottom:1px solid #e7f0e9}.result-heading .badge.example{color:#8d713e;border-color:#e7d6b7;background:#fff8e8}.result-summary{display:flex;gap:15px;align-items:flex-start;margin:21px 0}.answer-status{flex-shrink:0;padding:6px 10px;border-radius:8px;background:#eff7ef;color:#548461;font-size:12px}.answer-status.incorrect{background:#fcf0f2;color:#a65b6d}.answer-status.undetermined{background:#f2f0fa;color:#8777ae}.result-summary p{font-size:14px;line-height:1.95;overflow-wrap:anywhere}.candidate-note{font-size:11px;line-height:1.9;color:#718379;background:#f6faf4;border:1px solid #e6efdf;border-radius:9px;padding:10px 13px;margin:14px 0}.example-note{font-size:12px;color:#8e7040;background:#fff8e9;border:1px solid #edddbc;border-radius:9px;padding:11px 13px;margin:16px 0}.original-process{margin:15px 0;border:1px solid #e1ebe3;border-radius:10px;padding:11px 13px}.original-process>summary{font-size:12px;cursor:pointer;color:#6c8172}.original-process pre{font:12px/1.9 inherit;white-space:pre-wrap;overflow-wrap:anywhere;margin:11px 0 0;color:#526e5b}.result-grid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(280px,.9fr);gap:23px;margin-top:20px}.steps-list{display:grid;gap:12px;margin-top:11px}.analysis-step{border:1px solid #e0ece3;border-radius:11px;padding:14px;background:#fff}.analysis-step.first-issue{border-color:#deb4ba;background:#fff9fa}.step-top{display:flex;align-items:center;gap:9px;margin-bottom:7px}.step-top strong{font-size:12px}.verdict{display:inline-block;font-size:10px;border-radius:5px;padding:2px 7px;background:#eaf6ed;color:#4b855d}.verdict.invalid{background:#f9e9ed;color:#a45c6b}.verdict.uncertain{background:#f0ecfa;color:#8772a7}.first-badge{margin-left:auto;font-size:10px;color:#a75e6d}.student-text{font-size:13px;line-height:1.9;white-space:pre-wrap;overflow-wrap:anywhere}.step-reason{font-size:12px;line-height:1.85;color:#697e70;margin-top:7px;white-space:pre-wrap;overflow-wrap:anywhere}.scope-text{display:block;font-size:10px;line-height:1.9;color:#879788;margin-top:7px}.first-issue-note{border-left:3px solid #cb8895;background:#fff5f7;padding:10px 12px;margin:12px 0 17px;border-radius:0 8px 8px 0;font-size:12px;line-height:1.9;overflow-wrap:anywhere}.gaps{margin-top:11px}.gap-card{border:1px solid #e7e6d2;background:#fcfbf3;border-radius:10px;padding:12px;font-size:12px;line-height:1.8;margin-bottom:10px;overflow-wrap:anywhere}.gap-card strong{display:block;font-size:12px;margin-bottom:5px}.gap-card small{display:block;font-size:10px;color:#8d967d;margin-top:7px}.follow-up{border:1px solid #dceadc;background:#f8fcf6;border-radius:10px;padding:13px;margin-top:11px;overflow-wrap:anywhere}.follow-up>p{font-size:13px;line-height:1.8}.follow-up>small{display:block;color:#80917f;font-size:10px;line-height:1.8;margin:6px 0 9px}.follow-up textarea{font-size:12px;min-height:65px;padding:8px 10px}.follow-up button{font-size:10px;margin-top:7px}.next-task{font-size:12px;line-height:1.9;padding:12px;border-radius:9px;background:#eff8f0;margin-top:15px;white-space:pre-wrap;overflow-wrap:anywhere}.probe-list{display:grid;gap:8px;margin-top:12px}.probe-link{display:block;border:1px solid #d9e7d9;border-radius:9px;background:#fff;padding:10px 12px;text-decoration:none;font-size:12px}.probe-link small{display:block;color:#7e927f;font-size:10px;margin-top:3px}.probe-link:hover{background:#f1f9ee}.result-section+.result-section{margin-top:22px}.page-footer{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;font-size:11px;color:#819588;padding:20px 2px 2px}.page-footer a{font-size:11px}.busy .service-line i{animation:pulse 1.3s infinite}@keyframes pulse{50%{opacity:.35}}@media(prefers-reduced-motion:reduce){.busy .service-line i{animation:none}}
@media(min-width:1600px){main{padding-top:34px}.workspace{grid-template-columns:minmax(360px,.92fr) minmax(460px,1.08fr)}.task-diagram svg{max-height:330px}}
@media(max-width:1000px){main{padding:20px 18px}.card{padding:20px}.workspace{gap:15px;grid-template-columns:minmax(260px,.84fr) minmax(340px,1.16fr)}.intro{gap:15px}.service-card{max-width:340px}h1{font-size:27px}.result-grid{grid-template-columns:minmax(0,1fr) minmax(245px,.82fr);gap:17px}.card-heading>.badge{display:none}}
@media(max-width:760px){.app-header{gap:13px;padding:9px 16px;min-height:54px}.brand{font-size:13px}.brand span{width:26px;height:26px;font-size:21px}.header-title{font-size:13px}.header-title .badge{font-size:9px;padding:2px 5px}.app-header>a:last-child{font-size:10px}.intro{align-items:stretch;flex-direction:column;gap:15px;margin-bottom:17px}.service-card{max-width:none;padding:10px 13px}.workspace{grid-template-columns:minmax(0,1fr)}main{padding:20px 15px}.card{padding:20px;border-radius:14px}.task-list{gap:7px}.task-list button{padding:8px 12px;font-size:12px;flex:1;justify-content:center;white-space:nowrap}.task-list button span{display:none}.task-diagram svg{max-height:230px}.result-grid{grid-template-columns:minmax(0,1fr)}.result-card{padding:20px}.result-summary{gap:10px}.result-summary p{font-size:13px}.result-heading h2{font-size:17px}.result-heading .badge{font-size:9px}.page-footer{font-size:10px}textarea{min-height:170px}}
@media(max-width:440px){.app-header{gap:9px;padding:8px 11px}.brand{font-size:11px;gap:5px}.header-title{font-size:12px}.header-title .badge{display:none}.app-header>a:last-child{font-size:9px}main{padding:18px 11px}.card{padding:16px}h1{font-size:25px}.task-list button{font-size:11px;padding:8px}.editor-card label span{display:block;margin-left:0;margin-top:2px}.result-summary{flex-direction:column}.service-line{flex-wrap:wrap}.service-line strong{font-size:11px}.photo-previews{gap:6px}.photo-card img{height:70px}.problem-footer{align-items:flex-start}.step-top{flex-wrap:wrap}.first-badge{margin-left:0}}
/* A short voice take, followed by student review. */
.voice-input{border:1px solid #cee7d5;background:#f5fcf6;border-radius:14px;padding:12px 14px;margin:12px 0 18px;min-width:0}
.voice-controls{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.voice-controls .voice-start,.voice-preview-actions .voice-start{display:inline-flex;align-items:center;gap:7px;color:#23663b;background:#e5f5e8;border:1px solid #abd7b9;font-weight:700}
.voice-controls .voice-start:hover:not(:disabled),.voice-preview-actions .voice-start:hover:not(:disabled){background:#d6efdc;border-color:#75b88b}
.voice-status{font-size:12px;color:#326d46;margin:9px 0 0;line-height:1.6}
.voice-status.voice-error{color:#a34831}
.voice-tip{font-size:11px;color:#63816c;line-height:1.7;margin:5px 0 0}
.voice-timer{font-size:12px;font-variant-numeric:tabular-nums;color:#2e6a43;white-space:nowrap}
.voice-level{height:7px;width:65px;background:#d9ecdd;border-radius:20px;overflow:hidden}
.voice-level i{display:block;background:#4eb768;height:100%;width:0;transition:width .15s}
.voice-input.recording{border-color:#6cb583;box-shadow:0 0 0 2px #e4f5e8}
.voice-preview{border-top:1px solid #cde3d3;margin-top:13px;padding-top:13px}
.editor-card .voice-preview label{font-size:12px;margin:0 0 7px}
.voice-preview textarea{font-size:13px;min-height:90px;background:white}
.voice-preview-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
@media(max-width:640px){.voice-input{padding:10px}.voice-controls{gap:7px}.voice-timer{font-size:11px}.voice-level{width:45px}}