:root{color-scheme:light;--canvas:#f4f4f4;--paper:#fffef9;--ink:#111817;--muted:#999b99;--line:#e1e2de;--lime:#c4f566;--lime-dark:#9fda39;--success:#2f7d58;--danger:#b74352}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:var(--canvas);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
button,input{font:inherit}
.trainer{min-height:100vh;padding:18px 26px 32px}
.trainer-wrap{width:min(1180px,100%);min-height:calc(100vh - 50px);margin:auto;background:var(--paper);border:1px solid #ecece7;border-radius:18px;box-shadow:0 16px 45px rgba(20,27,24,.06);overflow:hidden}
.trainer-nav{height:68px;padding:0 42px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr auto 1fr;align-items:center}
.trainer-nav h1{margin:0;font-size:17px;line-height:1;font-weight:760}
.home-link{justify-self:start;display:inline-flex;align-items:center;gap:7px;color:#5f6561;text-decoration:none;font-size:12px;font-weight:650}
.home-link:hover{color:var(--ink)}
.lang{justify-self:end;min-width:54px;height:32px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);font-size:12px;font-weight:700;cursor:pointer}
.practice{width:min(520px,calc(100% - 32px));margin:0 auto;padding:58px 0 68px}
.levels{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}
.level{position:relative;min-height:44px;padding:8px 9px;border:1px solid #d9dbd7;border-radius:8px;background:#fff;color:var(--ink);font-size:11px;font-weight:680;line-height:1.25;cursor:pointer;transition:background .18s,color .18s,border-color .18s}
.level.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.passed{position:absolute;right:5px;top:3px;color:var(--lime-dark);font-size:10px}
.progress-block{margin-top:54px}
.progress-row{display:flex;justify-content:space-between;align-items:center;font-size:12px}
.progress-row strong{font-weight:600}
.bar{height:24px;margin-top:5px;border:1px solid #d9dbd7;border-radius:14px;background:#fff;box-shadow:0 8px 16px rgba(23,30,27,.09);overflow:hidden;padding:3px}
.bar i{display:block;width:0;height:100%;border-radius:9px;background:var(--lime);transition:width .25s ease}
.listen{display:flex;flex-direction:column;align-items:center;margin-top:68px}
.play-button{width:142px;height:142px;padding:0;border:1px solid var(--lime-dark);border-radius:50%;background:var(--lime);box-shadow:0 17px 24px rgba(75,88,45,.16);display:grid;place-items:center;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease}
.play-button:hover{transform:translateY(-2px);box-shadow:0 20px 30px rgba(75,88,45,.2)}
.play-button:active{transform:translateY(1px)}
.play-icon{width:0;height:0;margin-left:13px;border-top:31px solid transparent;border-bottom:31px solid transparent;border-left:51px solid var(--ink)}
.play-meta{display:flex;align-items:center;gap:9px;margin-top:15px;font-size:12px;font-weight:700}
.key{display:inline-flex;min-width:42px;height:22px;padding:0 7px;align-items:center;justify-content:center;border:1px solid #d4d7d2;border-radius:5px;background:#fff;color:#747874;font-size:9px;font-weight:600}
.answer-area{margin-top:44px}
.answer-area>label{display:block;margin-bottom:10px;text-align:center;font-size:12px;font-weight:720}
.answer-shell{height:58px;padding:5px 6px 5px 16px;border:1px solid #d9dbd7;border-radius:15px;background:#fff;box-shadow:0 10px 18px rgba(23,30,27,.1);display:flex;align-items:center;gap:10px}
.answer{min-width:0;flex:1;height:100%;border:0;outline:0;background:transparent;color:var(--ink);font-size:15px}
.answer::placeholder{color:#b9bbb8}
.answer:disabled{color:#777}
.answer-button{height:46px;min-width:96px;padding:0 10px;border:0;border-radius:10px;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:center;gap:9px;font-size:11px;font-weight:750;cursor:pointer}
.answer-button:disabled{cursor:not-allowed;opacity:.4}
.answer-button .key{min-width:27px;height:24px;border-color:#334236;background:#253529;color:var(--lime);font-size:8px}
.hint{min-height:22px;margin-top:12px;text-align:center;font-size:12px}
.hint.correct{color:var(--success)}
.hint.wrong{color:var(--danger)}
.history{width:min(520px,calc(100% - 32px));margin:0 auto 42px;padding-top:22px;border-top:1px solid var(--line)}
.history h2{margin:0 0 12px;font-size:12px}
.errors{display:flex;gap:7px;flex-wrap:wrap}
.error-chip{padding:7px 10px;border-radius:7px;background:#f8edef;color:#924253;font-size:11px}
.empty{color:var(--muted);font-size:11px}
@media(max-width:700px){.trainer{padding:0}.trainer-wrap{min-height:100vh;border:0;border-radius:0;box-shadow:none}.trainer-nav{height:62px;padding:0 15px;grid-template-columns:auto 1fr auto;gap:10px}.trainer-nav h1{text-align:center;font-size:14px}.home-link{font-size:0}.home-link::before{content:"←";font-size:20px}.practice{width:calc(100% - 28px);padding:38px 0 56px}.levels{grid-template-columns:repeat(2,minmax(0,1fr))}.level{min-height:48px}.progress-block{margin-top:42px}.listen{margin-top:56px}.play-button{width:126px;height:126px}.play-icon{border-top-width:28px;border-bottom-width:28px;border-left-width:46px}.answer-area{margin-top:42px}.answer-shell{height:56px;padding-left:13px}.answer{font-size:14px}.answer-button{min-width:87px}.history{width:calc(100% - 28px)}}