:root{
  --bg:#f6f2ea;--paper:#fffdf8;--ink:#1f2a2e;--mute:#6b7375;--line:#e3dccd;
  --accent:#1d5c63;--accent-ink:#174a50;--accent2:#c8553d;--ok:#3d7a4f;--bad:#b3402e;
  --soft:#e8f0ef;--soft-warm:#f4e9dd;--r:14px;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 Satoshi,system-ui,sans-serif}
h1,h2,h3{font-family:Gambetta,Georgia,serif;font-weight:600;line-height:1.2;margin:0 0 .4em}
h1{font-size:clamp(1.6rem,3vw,2.2rem)}h2{font-size:1.35rem}h3{font-size:1.08rem}
a{color:var(--accent)}
.wrap{max-width:940px;margin:0 auto;padding:20px 18px 80px}
header{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
  padding:12px 18px;border-bottom:1px solid var(--line);background:var(--paper);position:sticky;top:0;z-index:5}
.brand{font-family:Gambetta,serif;font-size:1.15rem;font-weight:600;white-space:nowrap}
.brand small{font-family:Satoshi;color:var(--mute);font-weight:400;margin-left:6px;font-size:.78rem;
  border:1px solid var(--line);border-radius:99px;padding:2px 8px;vertical-align:middle}
nav{display:flex;gap:6px;flex-wrap:wrap}
nav button{font-size:.88rem;padding:7px 11px}
nav button[aria-current="true"]{background:var(--accent);color:#fff;border-color:var(--accent)}
button,.btn{font:inherit;font-weight:500;border:1px solid var(--line);background:var(--paper);color:var(--ink);
  padding:9px 14px;border-radius:10px;cursor:pointer;text-decoration:none;display:inline-block}
button:hover,.btn:hover{border-color:var(--accent)}
.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.primary:hover{background:var(--accent-ink)}
button:disabled{opacity:.5;cursor:default}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:20px;margin:14px 0}
.muted{color:var(--mute)}.small{font-size:.85rem}
.tag{display:inline-block;font-size:.78rem;padding:3px 9px;border-radius:99px;background:var(--soft);color:var(--accent);font-weight:500}
.tag.warm{background:var(--soft-warm);color:var(--accent2)}
.tag.ok{background:#e9efe4;color:var(--ok)}
.sec-h{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.stat{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:14px}
.stat b{display:block;font-size:1.5rem;font-family:Gambetta,serif}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.word{border-top:1px dashed var(--line);padding:12px 0}
.word:first-of-type{border-top:0}
.word .en{font-family:Gambetta,serif;font-size:1.25rem}
.word .row{display:flex;align-items:baseline;justify-content:space-between;gap:10px;flex-wrap:wrap}
input[type=text],input[type=email],input[type=password],textarea,select{width:100%;font:inherit;color:var(--ink);
  border:1px solid var(--line);background:#fffefb;border-radius:10px;padding:10px 12px}
textarea{min-height:110px;resize:vertical}
input:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:1px}
.q{margin:16px 0;padding:14px;border:1px solid var(--line);border-radius:12px;background:#fffef9}
.q .prompt{font-weight:500;margin-bottom:8px}
.choices{display:flex;flex-direction:column;gap:6px}
.choice{display:flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid var(--line);border-radius:10px;cursor:pointer;background:#fffefb}
.choice:hover{border-color:var(--accent)}
.choice.sel{border-color:var(--accent);background:var(--soft)}
.choice.right{border-color:var(--ok);background:#e9efe4}
.choice.wrong{border-color:var(--bad);background:#f6e4e0}
.fb{margin-top:8px;padding:8px 12px;border-radius:10px;font-size:.9rem}
.fb.ok{background:#e9efe4;color:#2c5c3a}.fb.ko{background:#f6e4e0;color:#8a3225}
.lesson-nav{display:flex;justify-content:space-between;gap:10px;margin-top:18px;flex-wrap:wrap}
.activity{border:1px solid var(--line);border-radius:var(--r);background:var(--paper);margin:16px 0;overflow:hidden}
.activity>.head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;
  padding:14px 20px;border-bottom:1px solid var(--line);background:#fbf8f0;cursor:pointer}
.activity>.head h3{margin:0;font-size:1.05rem}
.activity>.head .meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.activity>.body{padding:18px 20px}
.activity.done>.head .meta .tag{background:#e9efe4;color:var(--ok)}
table{width:100%;border-collapse:collapse;font-size:.92rem}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.8rem;text-transform:uppercase;letter-spacing:.04em;color:var(--mute)}
.notice{border-left:4px solid var(--accent2);background:var(--soft-warm);padding:12px 16px;border-radius:0 10px 10px 0;margin:14px 0}
.notice.info{border-left-color:var(--accent);background:var(--soft)}
.notice.ok{border-left-color:var(--ok);background:#e9efe4}
ul.clean{list-style:none;padding:0;margin:8px 0}
ul.clean li{padding:4px 0 4px 22px;position:relative}
ul.clean li:before{content:"—";position:absolute;left:4px;color:var(--mute)}
.tabbar{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.tabbar button{font-size:.85rem;padding:6px 10px}
.tabbar button[aria-current="true"]{background:var(--accent);color:#fff;border-color:var(--accent)}
.auth-box{max-width:420px;margin:0 auto}
.auth-box input{margin:6px 0}
.divider{border:0;border-top:1px dashed var(--line);margin:18px 0}
.kbd{font-family:ui-monospace,monospace;font-size:.8rem;background:#f0ece2;border:1px solid var(--line);border-radius:6px;padding:1px 6px}
.mode-banner{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;
  padding:10px 16px;border-radius:12px;background:var(--soft);margin:0 0 6px;font-size:.9rem}
.mode-banner.cloud{background:#e9efe4}
.tts{font-size:.75rem;padding:4px 8px;border-radius:8px}
.progressbar{height:8px;border-radius:99px;background:#eee7d9;overflow:hidden;margin:8px 0}
.progressbar>div{height:100%;background:var(--accent);border-radius:99px;transition:width .4s}
.foot{max-width:940px;margin:0 auto;padding:18px;color:var(--mute);font-size:.8rem}
.foot p{margin:4px 0}
@media (max-width:600px){
  header{position:static}
  .card{padding:16px}
  .activity>.body{padding:14px}
}

.tscroll{overflow-x:auto;-webkit-overflow-scrolling:touch}