:root{font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:#172747;background:#f3f6fc;font-synthesis:none;--blue:#174bdf;--muted:#66738c;--border:#e1e7f0}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.4;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #83a3ff;outline-offset:4px}button{transition:background .18s,transform .18s}button:active:not(:disabled){transform:translateY(1px)}[hidden]{display:none!important}.header{padding:22px 5%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);background:#fff}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:#142641;font-size:21px;font-weight:750;letter-spacing:1px}.brand small{display:block;font-size:10px;letter-spacing:2px;font-weight:650;margin-top:3px}.brand-icon{position:relative;display:grid;place-items:center;width:46px;height:46px;border-radius:13px;background:var(--blue);color:#fff;font-size:23px;letter-spacing:-2px}.brand-icon span{position:absolute;font-size:14px;right:5px;top:1px}.header-right{display:flex;gap:20px;align-items:center}.class-label{font-size:14px;color:var(--muted);padding-right:20px;border-right:1px solid var(--border)}main{max-width:1300px;margin:auto;padding:42px 42px 30px}.page-heading{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:30px;gap:24px}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:750;color:var(--blue);margin:0 0 13px}h1{font-size:clamp(26px,2.4vw,36px);letter-spacing:-1px;line-height:1.45;margin:0;font-weight:760}.intro{color:var(--muted);margin:10px 0 0;font-size:16px}.mobile-break{display:none}.step-label{font-size:13px;white-space:nowrap;color:var(--blue);padding-bottom:5px}.step-label span{color:#79849a;margin-left:8px}.workspace{display:grid;grid-template-columns:1.1fr 1fr;gap:24px;align-items:stretch}.card{background:#fff;border:1px solid var(--border);border-radius:20px;padding:26px;box-shadow:0 7px 25px #253a6604}.card-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:22px}h2{font-size:19px;font-weight:720;line-height:1.5;margin:0;display:flex;align-items:center;gap:10px}.section-number{font-size:12px;background:#edf2ff;color:var(--blue);border-radius:7px;padding:4px 7px;letter-spacing:.5px}.badge{padding:7px 12px;background:#edf2ff;color:#2552bd;border-radius:7px;font-size:13px;white-space:nowrap}.word-card{display:flex;flex-direction:column}.input-label{font-size:14px;color:#526079;margin-bottom:13px}textarea{resize:vertical;width:100%;flex:1;min-height:320px;border:1px solid #dce4f0;background:#f9fbfe;border-radius:12px;padding:18px 20px;line-height:2;font-size:17px;color:#24385b}textarea::placeholder{color:#93a0b5}.input-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:12px 0 24px;font-size:12px;color:var(--muted)}.text-button{background:none;border:0;color:var(--blue);padding:4px 0;font-size:14px;font-weight:600;white-space:nowrap}.text-button:hover{text-decoration:underline}.example-bar{border-top:1px solid var(--border);padding-top:20px;display:flex;gap:12px;justify-content:space-between;align-items:center;color:var(--muted);font-size:14px}.validation{font-size:13px;color:#a55b10;margin:10px 0 0}.validation:empty{display:none}.right-column{display:flex;flex-direction:column;gap:18px}.settings{padding-bottom:20px}fieldset{border:0;padding:0;margin:0 0 21px}legend{font-size:14px;margin-bottom:10px;padding:0}.segmented{display:flex;gap:10px}.segmented label{flex:1;position:relative}.segmented input{position:absolute;opacity:0;width:100%;height:100%;margin:0;cursor:pointer}.segmented span{display:block;border:1px solid var(--border);border-radius:10px;padding:12px 14px;font-size:15px}.segmented small{color:var(--muted);margin-left:10px;font-size:12px}.segmented input:checked+span{background:#eef3ff;border-color:#638afa;color:#1649cc;box-shadow:inset 0 0 0 1px #638afa}.segmented input:focus-visible+span{outline:3px solid #83a3ff;outline-offset:3px}.setting-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px 18px}.setting-grid label{font-size:14px;display:flex;flex-direction:column;gap:8px}select{color:#283957;padding:10px 11px;border:1px solid #dce3ee;border-radius:8px;background:#fff;width:100%;font-size:14px;min-height:42px}.interval-label{display:flex;justify-content:space-between;align-items:center;margin-top:22px;font-size:14px}output{color:var(--blue);font-weight:700;background:#edf2ff;padding:3px 8px;border-radius:5px}input[type=range]{width:100%;accent-color:var(--blue);margin:16px 0 5px;cursor:pointer;height:16px}.range-labels{display:flex;justify-content:space-between;color:#7a879a;font-size:12px}.voice-test{margin-top:19px;padding-top:15px;border-top:1px solid var(--border);display:flex;gap:12px;align-items:center}.voice-test>span{font-size:12px;color:var(--muted);line-height:1.6}.button{border:0;border-radius:10px;font-size:14px;font-weight:650;padding:12px 17px;line-height:1.5;display:inline-flex;align-items:center;justify-content:center;gap:9px}.primary{background:var(--blue);color:#fff;box-shadow:0 4px 10px #174bdf1a}.primary:hover{background:#103dbb}.secondary{background:#eef2f9;color:#344969}.secondary:hover{background:#e0e8f5}.subtle{background:transparent;color:#4d607f;box-shadow:inset 0 0 0 1px #dce4ef}.subtle:hover{background:#f2f5fa}.start-card{background:#e7eeff;border:1px solid #d8e3ff;border-radius:17px;padding:20px;display:flex;align-items:center;justify-content:space-between;gap:18px}.start-card>div{display:flex;align-items:center;gap:11px}.ready-mark{display:grid;place-items:center;background:#fff;color:var(--blue);width:31px;height:31px;border-radius:50%;flex-shrink:0}.start-card p{margin:0;color:#264676;font-size:14px;font-weight:650}.start-card small{display:block;font-size:12px;font-weight:400;color:#5b7094;margin-top:6px}.start-card button{white-space:nowrap}.footnote{font-size:12px;color:#75829a;line-height:1.9;margin:22px 0 0}footer{max-width:1216px;padding:20px 0 25px;border-top:1px solid var(--border);margin:0 auto;display:flex;justify-content:space-between;font-size:12px;color:#8190a6}.session-top{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:26px}.session-card{background:#fff;border:1px solid var(--border);border-radius:24px;padding:25px 42px 32px;text-align:center}.session-meta{display:flex;justify-content:space-between;gap:15px;align-items:center;font-size:14px;color:var(--muted)}.listening-orb{width:220px;height:220px;margin:28px auto 24px;display:flex;align-items:center;justify-content:center;flex-direction:column;border:1px solid #dce5ff;border-radius:50%;box-shadow:0 0 0 15px #f4f7ff,0 0 0 16px #edf2fe;background:#f9fbff;gap:7px}.listening-orb>span{font-size:20px;color:#627594}.listening-orb strong{font-size:60px;color:#183fb1;line-height:1.3;font-weight:650;font-variant-numeric:tabular-nums;margin:0 4px}.listening-orb small{color:#7483a0;font-size:14px}.wave{height:25px;display:flex;align-items:center;gap:5px}.wave i{width:4px;height:10px;background:#4475f2;border-radius:3px}.wave i:nth-child(2),.wave i:nth-child(4){height:17px}.wave i:nth-child(3){height:25px}.speaking .wave i{animation:wave .75s infinite alternate}.speaking .wave i:nth-child(2n){animation-delay:-.3s}.speaking .wave i:nth-child(3){animation-delay:-.55s}@keyframes wave{to{transform:scaleY(.35)}}.session-card h2{justify-content:center;font-size:28px;margin-top:28px}.session-card>p{color:var(--muted);font-size:16px;line-height:1.7;margin-top:10px}.progress-track{margin:26px auto;max-width:650px;height:6px;background:#edf1f8;border-radius:5px;overflow:hidden}.progress-track>div{height:100%;background:var(--blue);width:0;transition:width .4s}.session-controls{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.session-controls .primary{min-width:145px}.session-card .keyboard-note{font-size:12px;margin:24px 0 0;color:#8290a5}.complete-card{text-align:center;padding:45px 0 32px}.complete-icon{display:grid;place-items:center;width:70px;height:70px;background:#e4edff;color:var(--blue);border:1px solid #cbdcff;border-radius:50%;font-size:31px;margin:0 auto 22px}.complete-card>p:not(.eyebrow){color:var(--muted);line-height:1.8}.complete-actions{display:flex;justify-content:center;gap:12px;margin-top:27px;flex-wrap:wrap}.answer-hint{color:var(--muted);font-size:14px}.answer-grid{list-style:none;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:0 28px}.answer-grid li{display:flex;align-items:center;gap:13px;border-bottom:1px solid var(--border);padding:18px 0;min-width:0}.answer-number{font-size:13px;color:#8794ac;font-variant-numeric:tabular-nums;min-width:22px}.answer-word{font-size:18px;font-weight:650;background:none;border:0;text-align:left;color:#233b64;padding:0;overflow-wrap:anywhere}.answer-word:hover{color:var(--blue)}.answer-meaning{font-size:14px;color:var(--muted);margin-top:6px;overflow-wrap:anywhere}.message{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);padding:16px 22px;max-width:min(560px,90vw);background:#203456;color:white;border-radius:12px;box-shadow:0 8px 40px #14243a30;z-index:10;line-height:1.7;font-size:14px}dialog{border:1px solid var(--border);border-radius:20px;max-width:460px;width:calc(100% - 32px);padding:28px;color:#243653}dialog::backdrop{background:#172c5266;backdrop-filter:blur(3px)}dialog p{color:var(--muted);line-height:1.8;font-size:16px}.dialog-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:24px}:fullscreen body{overflow:auto}
@media(min-width:1500px){main{padding-top:55px}}@media(max-width:1000px){main{padding:30px 24px}.step-label{display:none}.workspace{grid-template-columns:1fr 1fr;gap:18px}.card{padding:22px}.start-card{flex-wrap:wrap}.start-card button{width:100%}.segmented small{display:block;margin:5px 0 0}.answer-grid{grid-template-columns:repeat(2,1fr)}footer{margin:0 24px}.header{padding:18px 24px}}@media(max-width:720px){.header{padding:16px 20px}.brand{font-size:18px}.brand-icon{width:40px;height:40px}.brand small{font-size:9px}.class-label{display:none}.header-right{gap:0}.header-right button{font-size:12px;padding:10px}.workspace{grid-template-columns:1fr}.page-heading{margin-bottom:24px}main{padding:28px 18px}.mobile-break{display:block}h1{font-size:27px;letter-spacing:0}.card{padding:20px;border-radius:16px}textarea{min-height:250px}.input-footer{align-items:flex-start}.input-footer>span{max-width:240px;line-height:1.7}.start-card{flex-wrap:nowrap}.start-card button{width:auto}.start-card small{max-width:150px;line-height:1.6}.ready-mark{display:none}.footnote{line-height:1.9}.session-top{align-items:flex-start}.session-top .button{font-size:12px;padding:10px}.session-top h1{font-size:25px}.session-card{padding:20px 16px}.session-meta{font-size:12px;align-items:flex-start}.session-meta>span:last-child{max-width:140px;line-height:1.7}.session-controls{display:grid;grid-template-columns:1fr 1fr;gap:10px}.session-controls .primary{min-width:0}.session-card .keyboard-note{display:none}.listening-orb{margin-top:40px}.answer-grid{grid-template-columns:1fr}.complete-actions{flex-direction:column}.complete-card{padding-top:25px}footer{gap:15px;font-size:12px}.example-bar{font-size:13px;gap:8px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}

/* Local edition: sentence preparation and classroom cloze. */
.brand small{font-size:12px;letter-spacing:0;font-weight:500}.header-right{gap:12px}.local-status{font-size:13px;color:#52698c;line-height:1.6;margin:12px 0 0}.file-actions{display:flex;gap:18px;margin:0 0 18px;flex-wrap:wrap}.engine-label{display:block;font-size:14px;margin-bottom:18px}.engine-label select{margin-top:8px}.mode-note{color:#637492;line-height:1.8;font-size:14px}.sentence-panel{margin-top:24px}.generation-controls{display:flex;align-items:flex-end;gap:14px;flex-wrap:wrap}.generation-controls label{display:flex;flex-direction:column;gap:8px;font-size:14px;flex:1;min-width:180px}.generation-controls .level-detail{flex:1.5}.generation-controls input,#ai-dialog input{border:1px solid #dce3ee;border-radius:8px;padding:11px 12px;font-size:14px;min-height:43px;width:100%;background:#fff;color:#233656}.sentence-row{display:grid;grid-template-columns:170px 1fr;gap:20px;border-top:1px solid var(--border);padding:22px 0}.sentence-target strong{font-size:18px;overflow-wrap:anywhere}.sentence-target small{display:block;color:var(--muted);font-size:14px;line-height:1.6;margin-top:6px}.sentence-fields label{display:block;font-size:14px;margin-bottom:7px;color:#566882}.sentence-fields textarea{min-height:80px;line-height:1.7;font-size:16px;resize:vertical;padding:12px 15px;margin-bottom:8px}.sentence-fields textarea.translation-input{min-height:54px;font-size:14px}.sentence-preview{font-size:16px;color:#2c559a;line-height:1.8;background:#f1f5ff;border-radius:8px;padding:10px 14px;overflow-wrap:anywhere}.sentence-preview.invalid{color:#a25a12;background:#fff7e9}.sentence-actions{display:flex;gap:18px;align-items:center;margin-top:9px}.cloze-display{font-family:Arial,system-ui,sans-serif;max-width:950px;font-size:clamp(28px,3.5vw,48px);line-height:1.8;margin:28px auto 20px;color:#183b83;font-weight:550;overflow-wrap:anywhere}.cloze-display .blank{display:inline-block;min-width:3.8em;border-bottom:3px solid #4773e4;vertical-align:baseline;height:1.15em;margin:0 .12em}.cloze-session .listening-orb{width:130px;height:130px;margin:20px auto;box-shadow:0 0 0 8px #f4f7ff}.cloze-session .listening-orb strong{font-size:38px}.cloze-session .listening-orb>span{font-size:16px}.cloze-session .wave{display:none}.cloze-session h2{font-size:22px}.cloze-session .progress-track{margin:20px auto}.cloze-session .session-controls{margin-top:18px}.answer-sentence{font-size:16px;line-height:1.8;color:#2f4670;margin-top:10px}.answer-sentence mark{background:#e4edff;color:#1347ce;font-weight:700;padding:1px 3px;border-radius:3px}.answers-cloze{grid-template-columns:1fr!important}.answers-cloze li{align-items:flex-start}#ai-dialog{max-width:590px;max-height:90vh;overflow:auto}#ai-dialog label{display:block;font-size:14px;line-height:1.7;margin:20px 0 8px}#ai-dialog input{margin-top:8px}#ai-dialog .key-help{font-size:13px;margin:8px 0;line-height:1.8}a{color:#174bdf}.cloze-display .blank::before{content:"\00a0"}
@media(max-width:720px){.header-right .button{font-size:12px;padding:8px}.header-right{gap:6px}.brand small{font-size:10px}.sentence-row{grid-template-columns:1fr;gap:12px}.sentence-target{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}.sentence-target small{display:inline}.generation-controls{align-items:stretch}.generation-controls .button{width:100%}.cloze-display{font-size:29px}.sentence-panel .card-top{flex-wrap:wrap}}

.upload-button{margin:0 0 20px;background:#eef3ff;color:#174bdf;border:1px dashed #94b0fa;width:100%;padding:15px}.upload-button:hover{background:#e3edff}#ocr-dialog{max-width:980px;max-height:90vh;overflow:auto;width:calc(100% - 32px)}.ocr-toolbar{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin:15px 0}.ocr-toolbar label{cursor:pointer}#ocr-files{max-width:100%;font-size:14px}#ocr-dialog .key-help{font-size:13px;line-height:1.7;color:#66738c}.ocr-file{padding:12px 14px;border:1px solid var(--border);border-radius:9px;margin:10px 0;font-size:14px;overflow-wrap:anywhere}.ocr-file label{display:flex;align-items:center;gap:10px;margin-top:10px}.ocr-file input,.ocr-row input[type=text]{padding:9px 10px;font-size:16px;border:1px solid #dce3ee;border-radius:7px;min-width:0;width:100%;color:#233b64}.ocr-file input{max-width:240px}.ocr-row{display:grid;grid-template-columns:25px 1fr 1fr;gap:12px;border-top:1px solid var(--border);padding:14px 0;align-items:start}.ocr-row label{display:grid;gap:5px;font-size:13px;color:var(--muted)}.ocr-row input[type=checkbox]{width:18px;height:18px;accent-color:#174bdf;margin-top:29px}.ocr-row small{grid-column:2 / 4;font-size:12px;color:#7a879a;overflow-wrap:anywhere}.ocr-notes{font-size:14px;line-height:1.8;color:#905819;padding-left:22px;max-height:200px;overflow:auto}.ocr-import-footer{display:flex;gap:16px;align-items:center;justify-content:space-between;border-top:1px solid var(--border);padding-top:20px;font-size:14px;color:#66738c}#ocr-review{margin-top:28px}@media(max-width:640px){.ocr-row{grid-template-columns:25px 1fr}.ocr-row label:last-of-type{grid-column:2}.ocr-row small{grid-column:2}.ocr-import-footer{align-items:stretch;flex-direction:column}}

.dialog-message{padding:12px 15px;background:#fff3df;border:1px solid #efd3a7;border-radius:9px;color:#824a0c!important;font-size:14px!important;line-height:1.8}

#ai-dialog .remember-row{display:flex;align-items:center;gap:.5rem;margin:.25rem 0 .75rem;font-size:.92rem;cursor:pointer;}
#ai-dialog .remember-row input[type="checkbox"]{width:auto;margin:0;accent-color:#174bdf;}