:root{--ink:#213f39;--muted:#65766f;--green:#317669;--green-dark:#245b50;--mint:#eaf3ed;--paper:#fbfaf5;--line:#dde4dc;--yellow:#f1d68b;--white:#fff;--danger:#9e3737;font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none;font-size:16px}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{ -webkit-tap-highlight-color:transparent}a{color:var(--green);text-underline-offset:4px}button{cursor:pointer;border:0;transition:background .2s,transform .2s}button:hover:not(:disabled){transform:translateY(-1px)}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #ba8d21;outline-offset:4px}button,input,select{min-height:48px}button[hidden],[hidden]{display:none!important}.site-header{max-width:1280px;margin:auto;padding:28px 48px 24px;display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:var(--ink);font-weight:800;font-size:23px;letter-spacing:1px}.brand-icon{width:46px;height:46px;border-radius:16px 16px 16px 4px;background:var(--green);color:white;display:grid;place-items:center;font-size:22px;letter-spacing:-1px;transform:rotate(-7deg)}.brand small{display:block;font-size:10px;letter-spacing:2px;margin-top:4px;color:var(--muted)}.teacher-link{font-size:14px;color:var(--muted);text-decoration:none;white-space:nowrap}.student-layout{max-width:1280px;margin:0 auto;padding:38px 48px 24px;display:grid;grid-template-columns:330px minmax(0,1fr);gap:48px}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:700;color:var(--green)}h1{font-size:36px;line-height:1.45;letter-spacing:-1px;margin:14px 0 10px;font-weight:800;position:relative}.sparkle{color:#b99133;position:absolute;right:15px;top:40px;font-size:44px}h2{font-size:22px;margin:7px 0 0}h3{font-size:22px}.muted{color:var(--muted);font-size:14px}.lesson-card{background:white;border:1px solid var(--line);border-radius:20px;padding:22px;margin-top:25px;box-shadow:0 4px 0 #eff0e8}.lesson-card label{font-size:14px;display:block;font-weight:700;margin-bottom:8px}.lesson-card select{width:100%;padding:10px 14px;background:var(--paper);border:1px solid var(--line);border-radius:10px;color:var(--ink);margin-bottom:18px;font-size:17px}.lesson-card select:last-of-type{margin-bottom:4px}.mini{font-size:13px;line-height:1.7;color:var(--muted)}.lesson-card .mini{margin-bottom:0}.buddy-scene{height:222px;position:relative;display:flex;justify-content:center;margin-top:10px}.buddy-scene img{height:222px;width:222px;z-index:1;transform-origin:bottom center;animation:sway 5s ease-in-out infinite}.buddy-shadow{position:absolute;width:145px;height:18px;bottom:8px;border-radius:50%;background:#dce6d7}.float-star{position:absolute;color:#9eab7c;font-size:28px}.star-one{left:32px;top:48px}.star-two{right:42px;top:85px;font-size:21px;color:#bc9538}.buddy-caption{display:flex;align-items:center;justify-content:center;gap:8px;font-size:14px}.status-dot{width:7px;height:7px;background:var(--green);border-radius:50%}.voice-bars{display:none;position:absolute;bottom:32px;right:0;gap:4px;height:24px;align-items:center}.voice-bars i{width:5px;height:14px;background:var(--green);border-radius:5px;animation:bars .5s alternate infinite}.voice-bars i:nth-child(2){animation-delay:.15s}.voice-bars i:nth-child(3){animation-delay:.3s}.buddy-scene[data-state=speaking] .voice-bars{display:flex}.buddy-scene[data-state=speaking] img{animation:sway .5s ease-in-out infinite}.buddy-scene[data-state=listening]{border-radius:50%;background:radial-gradient(ellipse,#dcefe5,transparent 70%)}.buddy-scene[data-state=listening] img{animation:listen 1s ease-in-out infinite}.conversation-card{background:white;border:1px solid var(--line);border-radius:26px;box-shadow:0 8px 28px #26493c08;display:flex;flex-direction:column;min-width:0;height:700px;max-height:calc(100vh - 170px);min-height:590px;overflow:hidden}.chat-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:24px 28px;border-bottom:1px solid var(--line)}.round-pill{background:var(--mint);padding:8px 12px;border-radius:20px;font-size:13px;white-space:nowrap}.chat-log{padding:24px 28px;overflow-y:auto;flex:1;min-height:180px;scroll-behavior:smooth}.welcome{text-align:center;margin:28px auto 20px}.welcome-star{background:#fbf2d9;display:grid;place-items:center;color:#ac8526;border-radius:50%;width:65px;height:65px;font-size:38px;margin:auto}.welcome h3{font-size:28px;margin:22px 0 12px;letter-spacing:-.5px}.welcome p{font-size:16px;line-height:1.9;color:var(--muted)}.welcome-chips{display:flex;justify-content:center;gap:10px;margin-top:22px}.welcome-chips span{font-size:12px;padding:5px 12px;border:1px dashed #d1dacf;border-radius:16px;color:var(--muted)}.chat-controls{padding:18px 24px;border-top:1px solid var(--line);background:#fdfefa}.consent{display:flex;gap:10px;font-size:13px;line-height:1.8;color:var(--muted);align-items:flex-start;margin-bottom:16px}.consent input{min-height:auto;margin:5px 0 0;flex-shrink:0;width:18px;height:18px;accent-color:var(--green)}.primary{color:white;background:var(--green);padding:14px 22px;border-radius:12px;font-weight:700}.primary:hover{background:var(--green-dark)}.full{width:100%}.secondary{background:var(--mint);border:1px solid #d3e3d7;color:var(--green-dark);padding:10px 14px;border-radius:12px;white-space:nowrap;font-size:14px}.text-button{background:transparent;color:var(--muted);padding:10px;font-size:14px}.mic-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.mic-button{background:var(--green);color:white;border-radius:30px;display:flex;align-items:center;justify-content:center;gap:10px;padding:14px 19px;font-size:16px;font-weight:700}.mic-button svg{width:23px;height:23px}.mic-button.listening{background:#a6533d}.text-form{display:flex;gap:8px;margin-top:12px}.text-form input{flex:1;min-width:0;border:1px solid var(--line);border-radius:12px;padding:10px 14px;background:white;color:var(--ink)}.notice{font-size:13px;line-height:1.7;color:var(--muted);margin:12px 0 0;overflow-wrap:anywhere}.notice.error{color:var(--danger)}.message{max-width:92%;margin:0 0 20px;overflow-wrap:anywhere}.message .speaker{font-size:12px;letter-spacing:1px;color:var(--muted);margin:0 0 6px}.message .bubble{padding:15px 18px;border-radius:3px 18px 18px;background:var(--mint);font-size:20px;line-height:1.55;margin:0}.message.student{margin-left:auto}.message.student .speaker{text-align:right}.message.student .bubble{background:#fbefd0;border-radius:18px 3px 18px 18px}.feedback{font-size:13px;line-height:1.8;margin-top:8px;padding-left:10px;border-left:2px solid #e5cc86;color:#52665c}.feedback p{margin:3px 0}.site-footer{max-width:1280px;padding:16px 48px 28px;margin:auto;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:12px}.site-footer a{color:inherit}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.login-wrap{max-width:460px;margin:65px auto;padding:32px;background:white;border:1px solid var(--line);border-radius:24px}.login-wrap h1{font-size:28px}.form-field{display:block;margin:22px 0}.form-field input{display:block;width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-top:8px}.admin-main{max-width:1280px;padding:32px 48px;margin:auto}.admin-top{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.admin-top h1{font-size:30px;margin:0}.admin-actions{display:flex;gap:8px;flex-wrap:wrap}.stats{display:grid;grid-template-columns:1fr 1fr 2fr;gap:16px;margin:28px 0}.stat-card{padding:22px;background:white;border:1px solid var(--line);border-radius:18px}.stat-card strong{display:block;font-size:36px;margin-top:8px}.stat-card h2{font-size:15px;margin:0}.topic-counts{display:flex;gap:6px;flex-wrap:wrap;max-height:120px;overflow:auto;margin-top:10px}.topic-counts span{background:var(--mint);font-size:12px;border-radius:8px;padding:6px 8px}.table-wrap{background:white;border:1px solid var(--line);border-radius:16px;overflow:auto}table{border-collapse:collapse;width:100%;font-size:14px;text-align:left}th,td{padding:16px;border-bottom:1px solid var(--line);vertical-align:top}th{background:var(--mint);white-space:nowrap}td{min-width:95px}td.time{min-width:150px}td.id-cell{font-family:monospace;font-size:12px;max-width:150px;overflow-wrap:anywhere}.table-detail{min-width:300px;max-width:550px;overflow-wrap:anywhere}.table-detail summary{cursor:pointer;color:var(--green);padding:4px}.table-detail p{line-height:1.7}.pagination{display:flex;align-items:center;justify-content:center;gap:14px;margin:20px}.prose{max-width:780px;padding:28px;margin:30px auto;background:white;border:1px solid var(--line);border-radius:18px;line-height:1.9}.prose h1{font-size:28px}.prose h2{margin-top:26px;font-size:20px}.prose li{margin:8px 0}@keyframes sway{0%,100%{transform:rotate(-2deg)}50%{transform:rotate(2deg)}}@keyframes listen{50%{transform:scale(1.025)}}@keyframes bars{to{height:24px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}@media(min-width:1450px){.student-layout{padding-top:48px}.conversation-card{height:760px}}@media(max-width:1000px){.student-layout{grid-template-columns:260px minmax(0,1fr);gap:24px;padding:28px 24px}.site-header{padding:24px}.sparkle{right:0}h1{font-size:30px}.chat-heading{padding:20px}.chat-log{padding:20px}.chat-controls{padding:16px}.stats{grid-template-columns:1fr 1fr}.stat-card:last-child{grid-column:1/-1}.admin-main{padding:24px}}@media(max-width:720px){.site-header{padding:18px 20px}.brand{font-size:20px}.brand small{font-size:9px}.brand-icon{width:40px;height:40px}.student-layout{display:block;padding:22px 16px 12px}.practice-side{position:relative;padding-right:0}.practice-side>.eyebrow{font-size:11px}.practice-side h1{font-size:26px;line-height:1.35;margin:10px 0 6px;max-width:70%}.sparkle{display:none}.practice-side>.muted{font-size:12px;max-width:70%;line-height:1.6}.buddy-scene{position:absolute;right:0;top:0;width:112px;height:116px;margin:0}.buddy-scene img{width:112px;height:116px}.buddy-shadow{width:68px;height:9px;bottom:6px}.float-star{display:none}.buddy-caption{position:absolute;right:0;top:119px;font-size:11px;max-width:130px}.voice-bars{right:0;bottom:10px;height:18px}.lesson-card{display:grid;grid-template-columns:1fr 1fr;column-gap:12px;padding:15px;margin-top:20px;margin-bottom:20px;border-radius:16px}.lesson-card label{font-size:12px}.lesson-card label[for=topic]{grid-column:2;grid-row:1}.lesson-card select{grid-row:2;margin:0!important;font-size:15px;padding:9px;min-height:46px}.lesson-card .mini{grid-column:1/-1;margin-top:10px;font-size:12px}.conversation-card{height:640px;max-height:none;min-height:0;border-radius:20px}.chat-heading h2{font-size:20px}.chat-heading .eyebrow{font-size:10px}.chat-log{padding:20px 16px}.welcome{margin-top:18px}.welcome h3{font-size:24px}.mic-row{gap:5px}.mic-button{padding:12px 14px;font-size:14px}.mic-row .secondary{font-size:12px;padding:10px}.text-button{font-size:12px;padding:8px}.site-footer{padding:18px 20px;line-height:1.8}.login-wrap{margin:35px 16px;padding:24px}.admin-main{padding:24px 16px}.stats{gap:10px}.stat-card{padding:16px}.prose{margin:24px 16px;padding:20px}.consent{font-size:12px}.message .bubble{font-size:18px}}
.speech-tools{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.speech-tools .text-button{padding:2px 4px;min-height:30px;font-size:12px;text-decoration:underline;text-underline-offset:3px}.speech-tools meter{width:100px;height:18px}#speech-help{margin-bottom:4px}#mic-diagnostic{padding:8px 10px;background:var(--mint);border-radius:8px;margin:6px 0}
.header-links,.student-auth-nav{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.header-links{justify-content:flex-end;font-size:14px}.student-auth-nav .text-button{min-height:32px;padding:3px 0}.form-field select{display:block;width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-top:8px;background:white;color:var(--ink)}@media(max-width:720px){.header-links,.student-auth-nav{gap:8px}.header-links{font-size:12px}}
.practice-modes{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:0 0 18px}.mode-button{min-height:42px;padding:8px;border-radius:12px;background:var(--paper);color:var(--muted);font-weight:700;border:1px solid var(--line)}.mode-button.active{background:var(--mint);border-color:#aac9b9;color:var(--green-dark)}.scenario-picker{margin:16px 0 10px}.scenario-picker h2{font-size:18px;margin:0 0 4px}.scenario-picker>.mini{margin:4px 0 12px}.scenario-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.scenario-card{min-height:76px;padding:10px 8px;border:1px solid var(--line);border-radius:13px;background:#fff;text-align:left;color:var(--ink);font-size:14px;font-weight:700}.scenario-card span{display:block;font-size:21px;margin-bottom:3px}.scenario-card[aria-pressed=true]{border-color:var(--green);background:var(--mint);box-shadow:0 0 0 2px #31766920}.scenario-detail{border-top:1px solid var(--line);margin-top:14px;padding-top:12px}.scenario-detail h3{margin:0 0 10px;font-size:18px}.scenario-roles{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:0}.scenario-roles div{padding:9px;background:var(--paper);border-radius:10px}.scenario-roles dt,.scenario-list-title{font-size:12px;color:var(--muted);font-weight:700}.scenario-roles dd{margin:4px 0 0;font-weight:700;font-size:14px}.scenario-list-title{margin-bottom:5px}.scenario-expressions,.scenario-progress ul,.scenario-result ul{margin:5px 0 0;padding-left:20px;color:var(--muted);font-size:13px;line-height:1.75}.chat-heading-side{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}.scenario-progress{padding:10px 28px;background:#f8fbf7;border-bottom:1px solid var(--line);font-size:13px}.scenario-progress>div{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}.scenario-progress ul{display:flex;flex-wrap:wrap;gap:4px 18px;padding-left:18px}.scenario-progress li.done{color:var(--green);font-weight:700}.scenario-result{padding:20px 24px;margin:0 24px 18px;background:var(--mint);border:1px solid #d5e5da;border-radius:16px}.scenario-result h3{font-size:22px;margin:0 0 6px}.scenario-result p{color:var(--muted);font-size:14px}.scenario-result>div{margin-top:12px;font-size:14px}.scenario-result-actions{display:flex;gap:8px;flex-wrap:wrap}.scenario-result-actions a{display:inline-flex;align-items:center;justify-content:center;padding:10px 14px;min-height:44px;background:white;border-radius:12px;text-decoration:none;color:var(--green-dark);font-weight:700}.scenario-result-actions button{min-height:44px;padding:9px 14px;border-radius:12px;font-weight:700}.scenario-result-actions .secondary{background:#fff;color:var(--green-dark)}@media(max-width:720px){.scenario-progress{padding:10px 16px}.scenario-result{margin:0 12px 14px;padding:16px}.scenario-result-actions>*{flex:1 1 130px}}
.conversation-card.scenario-finished{height:auto;max-height:none;overflow:visible}.conversation-card.scenario-finished .chat-log{min-height:220px;max-height:55vh}.conversation-card.scenario-finished .chat-controls{border-top:0}
@media(max-width:720px){.lesson-card{display:block}.lesson-card .practice-modes{margin-bottom:14px}.lesson-card select{margin-bottom:16px!important}}
.pronunciation-options{border-bottom:1px solid var(--line);margin-bottom:12px;padding-bottom:8px}.reference-toggle{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:700}.reference-toggle input{min-height:24px;width:18px;height:18px}.pronunciation-options label[for=reference-text]{display:block;font-size:13px;margin:6px 0}.pronunciation-options input[type=text]{width:100%;min-height:40px;padding:8px 10px;border:1px solid var(--line);border-radius:9px;color:var(--ink);background:#fff}.pronunciation-options .mini{margin:5px 0}.pronunciation-feedback{padding:12px;margin-top:10px;border:1px solid #d5e5da;background:#f7fbf8;border-radius:12px;text-align:left}.pronunciation-feedback h3{font-size:15px;margin:0 0 6px}.pronunciation-feedback .mini{font-size:12px;margin:5px 0;line-height:1.65}.pronunciation-scores{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}.pronunciation-scores div{flex:1 1 75px;padding:7px;background:#fff;border-radius:8px}.pronunciation-scores dt{font-size:12px;color:var(--muted)}.pronunciation-scores dd{font-weight:700;margin:3px 0 0;font-size:14px}.pronunciation-focus{font-size:13px;font-weight:700;margin:10px 0 6px}.pronunciation-words{padding-left:20px;margin:5px 0}.pronunciation-words li{margin-bottom:9px;font-size:13px}.pronunciation-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}.pronunciation-actions button{min-height:40px;font-size:12px;padding:8px 12px}.feedback-heading{font-weight:700}.message.student.pronunciation-message{max-width:94%}
/* A real tap can resume neural audio in embedded browsers after autoplay denial. */
.playback-recovery { margin: .75rem 0; min-height: 48px; }
.feedback summary { cursor: pointer; font-weight: 600; }

/* The visible microphone button receives the tap, including its icon area. */
.mic-button{position:relative;z-index:1;touch-action:manipulation;isolation:isolate}.mic-button>*{pointer-events:none}