:root{font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:#193d34;background:#f3f6f5;font-size:16px;--green:#175c47;--lime:#dceb82;--line:#dce5e0;--muted:#65796e}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select{touch-action:manipulation}a{color:inherit;text-decoration:none}button{cursor:pointer;border:0;border-radius:10px;padding:12px 20px;background:#edf2ef;color:var(--green);font-weight:600}button:disabled{opacity:.5;cursor:default}button:hover:not(:disabled){filter:brightness(.95)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #d29c1d;outline-offset:3px}header{height:96px;padding:0 5%;display:flex;align-items:center;gap:36px;background:#fff;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;font-size:24px;font-weight:750;min-width:160px}.logo{position:relative;display:grid;place-items:center;background:var(--green);color:white;width:44px;height:44px;border-radius:13px;font-size:27px}.logo span{position:absolute;color:#e9bd45;top:0;right:4px}.brand small{display:block;font-size:11px;letter-spacing:2px;margin-top:3px}nav{display:flex;gap:28px;flex:1}nav a{font-size:15px;color:#52695c;padding:35px 0}nav a.active{color:var(--green);border-bottom:3px solid var(--green);font-weight:700}.quiet{background:transparent;border:1px solid var(--line);font-size:14px;padding:10px 14px}main{max-width:1200px;margin:0 auto;padding:46px 36px 64px;min-height:70vh}.page-top{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:32px}.eyebrow{font-size:13px;letter-spacing:1.4px;font-weight:650;margin:0 0 14px}.page-top h1{font-size:32px;letter-spacing:-.8px;margin:0 0 12px;font-weight:750}h2{font-size:23px;margin:0 0 16px}h3{font-size:18px}.muted{color:var(--muted);line-height:1.6}.page-top p.muted{margin:0}.tag{background:#e7efea;border-radius:7px;padding:7px 11px;font-size:13px;display:inline-block}.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.today-card{background:var(--green);color:white;border-radius:20px;padding:35px 36px;position:relative;overflow:hidden}.today-card .eyebrow{color:#cae0d1}.today-card h2{font-size:36px;line-height:1.45;letter-spacing:-1px;margin:24px 0}.numbers{display:flex;gap:36px;margin:24px 0 30px}.numbers b{font-size:34px;display:block}.numbers span{font-size:14px;color:#cee0d5;display:block;margin-top:8px}.primary{background:var(--green);color:white}.today-card .primary{background:var(--lime);color:#183b30;width:100%;padding:16px}.subtle{font-size:13px;color:#d2e1d8;margin-top:16px;line-height:1.6}.sample-card{background:white;border:1px solid var(--line);border-radius:20px;padding:26px 30px;text-align:center}.card-top{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--muted)}.sample-card>img{width:146px;height:146px;margin:10px auto 0}.sample-card h2{font-size:31px;letter-spacing:.5px;margin:8px 0}.sound{background:#e8f0eb;padding:7px 10px;border-radius:50%;font-size:15px}.phonetic{font-family:"Segoe UI",sans-serif;color:var(--muted);font-size:15px;margin:6px 0}.example{padding:14px;background:#f3f6f4;border-radius:10px;margin:18px 0;font-size:16px;line-height:1.5}.example span{display:block;font-size:14px;color:var(--muted);margin-top:5px}.card-foot{border-top:1px solid var(--line);padding-top:15px;color:#8a631b;font-size:14px;text-align:left}.card-foot span{display:block;margin-top:7px;color:var(--muted);line-height:1.6}.section-heading{display:flex;justify-content:space-between;gap:16px;align-items:center;margin:32px 0 18px}.section-heading h2{font-size:20px;margin:0}.section-heading span{font-size:14px}.tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.tiles>a{border:1px solid var(--line);padding:23px;background:#fff;border-radius:15px}.tiles h3{margin:14px 0 7px}.tiles p{font-size:14px;color:var(--muted);margin:0;line-height:1.6}.tile-icon{background:#edf3e1;color:var(--green);padding:9px 12px;border-radius:9px;font-size:21px}footer{border-top:1px solid var(--line);padding:24px 5%;display:flex;justify-content:space-between;gap:16px;color:var(--muted);font-size:13px}footer a{margin-left:15px;text-decoration:underline}.panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px;margin-bottom:20px}.toolbar{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-bottom:22px}input,select,textarea{border:1px solid #bccdc1;background:#fff;color:#193d34;padding:12px;border-radius:9px;max-width:100%;min-height:44px}input[type=search]{flex:1;min-width:180px}label{font-size:14px;display:block;margin-bottom:7px}textarea{width:100%;line-height:1.6;resize:vertical}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left}th{font-size:14px;color:var(--muted);background:#f4f7f5}th,td{padding:15px 12px;border-bottom:1px solid var(--line)}td{font-size:15px}td small{display:block;font-size:13px;color:var(--muted);margin-top:4px}.status{font-size:12px;border-radius:5px;padding:5px 7px;white-space:nowrap;background:#edf1ef}.status.weak{background:#fff0df;color:#93630e}.status.master{background:#e6f2df;color:#3b6f2e}.actions{display:flex;gap:8px;flex-wrap:wrap}.actions button{padding:7px 10px;font-size:13px}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:24px}.stat{padding:22px;border:1px solid var(--line);background:white;border-radius:13px}.stat b{font-size:29px;display:block;margin-bottom:9px}.stat span{color:var(--muted);font-size:14px}.empty{text-align:center;padding:45px 20px;line-height:1.8;color:var(--muted)}.progress-bar{height:9px;background:#e6ede8;border-radius:20px;overflow:hidden}.progress-bar span{display:block;height:100%;background:#5b946f;border-radius:20px}.study-shell{max-width:760px;margin:auto}.study-top{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:18px}.study-card{background:white;border:1px solid var(--line);border-radius:20px;padding:35px;text-align:center}.study-card h1{font-size:40px;margin:15px 0;overflow-wrap:anywhere}.study-card img{height:150px;width:150px;object-fit:contain}.study-card .meaning{font-size:23px}.study-card .clue{background:#eff5e6;border-radius:10px;padding:16px;color:#506940;font-size:15px;line-height:1.7;text-align:left}.study-card .actions{justify-content:center;margin-top:25px}.question{font-size:28px;margin:32px 0;line-height:1.5;overflow-wrap:anywhere}.options{display:grid;grid-template-columns:1fr 1fr;gap:12px}.options button{background:white;border:1px solid #bdcec3;text-align:left;padding:18px}.options button.correct{background:#e5f3dd;border-color:#65a44b}.options button.wrong{background:#fff0e7;border-color:#c27e51}.answer-input{width:100%;font-size:22px;text-align:center}.feedback{text-align:left;margin-top:22px;padding:20px;border-radius:12px;background:#edf5e8}.feedback.bad{background:#fff2e6}.feedback p{line-height:1.6}.feedback img{float:right;width:75px;height:75px}.hint{font-size:14px;color:#93630e;margin:15px 0}.row{display:flex;gap:16px}.row>*{flex:1}.field{margin:16px 0}.field input,.field select{width:100%}.danger{color:#9b452b;background:#fff1e9}.small{font-size:14px;line-height:1.7}.divider{height:1px;background:var(--line);margin:24px 0}dialog{border:1px solid var(--line);border-radius:18px;padding:28px;width:min(680px,92vw);color:#193d34;max-height:90vh}dialog::backdrop{background:#122d2470}.modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.modal-head h2{margin:0}.modal-head button{padding:8px 12px}.choice-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.choice-grid button{padding:22px;border:1px solid var(--line);background:white;text-align:left;line-height:1.7}.choice-grid button strong{display:block}.choice-grid button.selected{border:2px solid var(--green);background:#eff5ef}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#193d34;color:white;border-radius:11px;padding:13px 22px;z-index:10;display:none;max-width:90%;font-size:14px}.chart{display:flex;gap:10px;align-items:flex-end;height:160px;padding-top:10px}.chart-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:7px;font-size:12px;color:var(--muted)}.chart-col i{width:65%;background:#75a887;border-radius:5px 5px 0 0;min-height:2px}.chart-col b{font-size:13px}.credits a{text-decoration:underline}.note{padding:15px;background:#f5f6eb;border-radius:9px;color:#68713b;font-size:14px;line-height:1.7}.file-button{position:relative;overflow:hidden;display:inline-block;background:#edf2ef;border-radius:10px;padding:12px 20px;cursor:pointer;margin:0;font-weight:600}.file-button input{position:absolute;inset:0;opacity:0;width:100%;cursor:pointer}.confidence{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}.link-button{text-decoration:underline;background:none;padding:8px;font-size:14px}.unit-row{margin:20px 0}.unit-row .section-heading{margin:0 0 10px}.word-icon{width:42px;height:42px;vertical-align:middle;margin-right:10px}.live-note{font-size:14px;margin-top:18px;color:var(--muted);line-height:1.7}@media(max-width:1000px){header{gap:15px;padding:0 3%;height:auto;flex-wrap:wrap;min-height:85px}.brand{min-width:135px}nav{gap:18px}nav a{font-size:14px;padding:26px 0}.quiet{font-size:13px}.hero-grid{gap:16px}.today-card{padding:28px}.numbers{gap:23px}}@media(max-width:720px){header{padding:14px 20px;gap:12px}.brand{flex:1}.brand small{font-size:10px}nav{order:3;flex:none;width:100%;overflow:auto;gap:24px}nav a{white-space:nowrap;padding:12px 0;font-size:14px}main{padding:28px 18px 40px}.page-top{align-items:flex-start;margin-bottom:22px}.page-top h1{font-size:26px}.page-top>.tag{display:none}.hero-grid{grid-template-columns:1fr}.today-card h2{font-size:31px}.today-card{padding:27px}.sample-card{padding:24px}.tiles{grid-template-columns:1fr}.tiles>a{display:block}.stats-grid{grid-template-columns:1fr 1fr;gap:10px}.stat{padding:18px}.study-card{padding:24px 18px}.study-card h1{font-size:33px}.question{font-size:24px}.options{grid-template-columns:1fr}.choice-grid{grid-template-columns:1fr}.choice-grid button{padding:16px}.row{flex-direction:column;gap:0}.section-heading{align-items:flex-start}.panel{padding:20px 16px}footer{flex-direction:column;padding:24px 20px}.numbers{justify-content:space-between}.toolbar button{flex-grow:1}th,td{padding:12px 8px}.actions{gap:6px}}@media(prefers-reduced-motion:no-preference){main{animation:appear .25s ease}@keyframes appear{from{opacity:.6;transform:translateY(4px)}to{opacity:1;transform:none}}}


.voice-start{margin-top:14px;background:#ffffff16;color:#fff;border:1px solid #ffffff50;width:100%}.voice-controls{display:flex;justify-content:center;gap:16px;align-items:center;flex-wrap:wrap;margin:24px 0 14px}.mic-button{display:flex;align-items:center;gap:12px;background:#175c47;color:#fff;padding:18px 26px;touch-action:none;user-select:none;-webkit-user-select:none}.mic-button span{font-size:27px}.mic-button.recording{background:#9f3a35;box-shadow:0 0 0 6px #f6dfd9}.voice-status{min-height:48px;font-size:15px;color:#65796e;line-height:1.6}.voice-footer{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-top:24px;flex-wrap:wrap}.voice-footer label{margin:0}.voice-footer input{min-height:auto}.voice-controls button:disabled{opacity:.45}

.mic-bars{display:flex;align-items:center;justify-content:center;gap:5px;height:56px;margin:12px auto}.mic-bars i{display:block;width:6px;height:4px;background:#2379b6;border-radius:4px;transition:height 60ms linear}

.voice-controls{display:flex;gap:12px;align-items:stretch;flex-wrap:wrap}.voice-controls>*{min-height:56px;flex:1 1 180px}.voice-next{touch-action:manipulation;min-width:180px}@media(max-width:600px){.voice-controls{position:sticky;bottom:12px;z-index:3;background:var(--paper,#fff);padding:10px;border-radius:18px;box-shadow:0 8px 24px #0002}.voice-controls>*{font-size:17px}}

.unit-cards{display:grid;gap:14px}.unit-card{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px;border:1px solid var(--line,#d9e1e8);border-radius:18px;background:var(--surface,#fff)}.unit-card h3{margin:4px 0}.unit-card button{min-height:52px}@media(max-width:600px){.unit-card{align-items:stretch;flex-direction:column}.unit-card button{width:100%;font-size:17px}}

.unit-actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end}.unit-actions button{min-height:52px}@media(max-width:600px){.unit-actions{display:grid;grid-template-columns:1fr}.unit-actions button{width:100%}}

.unit-manager{display:grid;gap:8px}.unit-manager-row{display:flex;align-items:center;gap:8px;padding:10px 0;border-bottom:1px solid var(--line,#dde5e8)}.unit-manager-row span{flex:1}.unit-manager-row small{display:block;color:#718087;margin-top:3px}@media(max-width:600px){.unit-manager-row{flex-wrap:wrap}.unit-manager-row span{flex-basis:100%}}

.related-words{margin:14px 0;padding:12px 14px;background:#f1f7f4;border-radius:12px}.related-words span{display:inline-block;margin:6px 12px 0 0}.related-words strong{color:#145f50}

/* iPad voice status layout */
.mic-bars{display:inline-flex;width:42%;height:38px;margin:8px 2% 8px 8%;vertical-align:middle;gap:3px}.mic-bars i{width:4px}.mic-bars + .small{display:inline-block;width:42%;margin:0;vertical-align:middle;text-align:left;font-size:18px;font-weight:600}.mic-bars + .small::before{content:' ';}@media(max-width:600px){.mic-bars{width:38%;margin-left:4%;margin-right:3%}.mic-bars + .small{width:48%;font-size:16px}}

/* Single-screen tablet study workspace; natural scrolling remains on small screens. */
.study-mode header{height:64px;min-height:64px;gap:20px;padding:0 3%;flex-wrap:nowrap}
.study-mode header .brand{font-size:20px;min-width:130px}.study-mode header .logo{width:36px;height:36px}
.study-mode nav{gap:18px}.study-mode nav a{padding:20px 0}.study-mode footer{display:none}
.study-mode main{padding:12px 20px;min-height:0;max-width:1280px}
.study-mode .study-shell{max-width:none}.study-mode .study-top{margin-bottom:8px}
.study-mode .study-top p{margin:4px 0;font-size:14px}.study-mode .study-top .eyebrow{font-size:12px}
.study-mode .study-card{margin-top:12px!important;padding:18px}
.study-mode .study-card:has(.study-answer-pane){display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:20px;text-align:left}
.study-answer-pane{min-width:0;text-align:center}.study-feedback-pane{min-width:0;border-left:1px solid var(--line);padding-left:20px}
.study-mode .question{font-size:36px;margin:12px 0;line-height:1.2}
.study-mode .study-answer-pane>p.muted{margin:8px 0 12px}.study-mode .answer-input{font-size:20px;min-height:48px}
.study-mode .voice-controls{position:static;box-shadow:none;padding:0;margin:12px 0 8px;gap:8px;flex-wrap:nowrap}
.study-mode .voice-controls>*{min-height:52px;flex:1 1 0;padding:10px;font-size:15px;justify-content:center}
.study-mode .study-card .actions{margin:8px 0;gap:8px}.study-mode .actions button{min-height:48px;font-size:16px;padding:10px 14px;flex:1}
.study-mode .voice-next{width:100%;min-height:48px;font-size:18px;margin-bottom:4px}
.study-mode .mic-bars{width:35%;margin:4px 3% 4px 0;height:30px}.study-mode .mic-bars i{max-height:30px}
.study-mode #micLevel{width:58%;font-size:14px;line-height:1.4}
.study-mode .voice-status{min-height:42px;font-size:14px;line-height:1.4;margin:6px 0;overflow-wrap:anywhere}
.study-mode .voice-footer{margin-top:8px;gap:4px}.study-mode .voice-footer button{min-height:44px}.study-mode .voice-help{margin:4px 0;font-size:12px}
.study-mode .feedback{margin:0;padding:16px;display:flow-root;font-size:15px}.study-mode .feedback p{margin:10px 0;line-height:1.45}
.study-mode .feedback img{width:60px;height:60px}.study-mode .feedback .example{margin:10px 0;padding:10px;font-size:15px}
.study-mode .related-words{margin:10px 0;padding:10px;font-size:14px}.study-mode .related-words span{display:block;margin:6px 0;line-height:1.4}
.feedback-placeholder{height:100%;min-height:360px;display:flex;flex-direction:column;justify-content:center;text-align:center;color:var(--muted);padding:20px}
.feedback-placeholder>span{font-size:52px;color:#9ab8a5}.feedback-placeholder h2{font-size:21px;margin:14px 0 0}.feedback-placeholder p{line-height:1.7}
.study-mode .study-card:not(:has(.study-answer-pane)){padding:18px}.study-mode .study-card>img{width:85px;height:85px}.study-mode .study-card h1{margin:10px 0}
.study-mode .study-card .clue{padding:10px}.study-mode .study-card .meaning{margin:10px 0}
@media(min-width:740px) and (max-height:850px){.study-mode .study-card{padding:12px}.study-mode .question{margin:8px 0;font-size:30px}.study-mode .feedback{padding:12px}.study-mode .feedback p{margin:7px 0}.study-mode .voice-help{display:none}}
@media(max-width:739px){.study-mode header{height:auto;flex-wrap:wrap;padding:10px 16px}.study-mode nav{order:3;width:100%}.study-mode nav a{padding:8px 0}.study-mode main{padding:12px}.study-mode .study-card:has(.study-answer-pane){grid-template-columns:1fr}.study-feedback-pane{border-left:0;border-top:1px solid var(--line);padding:16px 0 0}.feedback-placeholder{min-height:100px;padding:8px}.feedback-placeholder>span{display:none}}

@media(min-width:740px) and (max-height:850px){.study-mode .study-top{margin-bottom:4px}.study-mode .study-card{margin-top:8px!important}.study-mode .study-answer-pane>p.muted{margin:4px 0 8px}.study-mode .voice-controls{margin:8px 0 4px}.study-mode .voice-status{min-height:32px;margin:4px 0}.study-mode .voice-footer{margin-top:4px}}