:root{--ink:#122620;--cream:#f2eee3;--paper:#fffdf8;--jade:#2d6e61;--jade-light:#dcece5;--coral:#df6a48;--gold:#bc954e;--muted:#738079;--line:rgba(18,38,32,.14);--shadow:0 22px 70px rgba(32,49,42,.09)}
.sound-setting{display:block!important}.sound-setting>b{display:block;margin-bottom:9px;font-size:11px}.sound-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.sound-options button{min-width:0;min-height:58px;padding:10px 12px;border:1px solid #ded9ce;border-radius:12px;background:#fff;color:#63706c;text-align:left}.sound-options button b,.sound-options button small{display:block}.sound-options button b{font-size:12px}.sound-options button small{margin-top:4px;color:#919a96;font-size:8px;line-height:1.35}.sound-options button.active{border-color:#236b62;background:#edf7f3;color:#236b62;box-shadow:inset 3px 0 #236b62}.sound-options button.active small{color:#62857d}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--cream);color:var(--ink);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif}.app-shell{min-height:100vh;background:radial-gradient(circle at 91% 4%,rgba(45,110,97,.17),transparent 28%),radial-gradient(circle at 5% 90%,rgba(223,106,72,.10),transparent 24%),linear-gradient(180deg,#f7f3ea,#eee8da);padding-bottom:44px}.topbar{height:76px;padding:0 clamp(20px,5vw,76px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:rgba(255,253,248,.72);backdrop-filter:blur(16px)}.brand{display:flex;align-items:center;gap:13px;color:inherit;text-decoration:none}.brand-mark{width:41px;height:41px;display:grid;place-items:center;border-radius:11px;background:var(--ink);color:white;font:italic 700 22px Georgia,serif;box-shadow:5px 5px 0 var(--coral)}.brand b{display:block;font:700 16px Georgia,"Songti SC",serif}.brand small{display:block;margin-top:3px;color:var(--muted);font-size:9px;letter-spacing:.16em;text-transform:uppercase}.session-stats{display:flex;gap:8px}.session-stats>span{min-width:82px;padding:8px 12px;border-left:1px solid var(--line)}.session-stats small{display:block;color:var(--muted);font-size:9px}.session-stats b{display:block;margin-top:3px;font:700 16px Georgia,serif}.session-stats i{font-style:normal}.intro{max-width:1380px;margin:auto;padding:36px clamp(20px,5vw,76px) 24px;display:flex;justify-content:space-between;align-items:flex-end;gap:42px}.eyebrow{margin:0 0 10px;color:var(--coral);font-size:10px;font-weight:800;letter-spacing:.15em}.intro h1{margin:0;font:700 clamp(36px,4.5vw,66px)/1 Georgia,"Songti SC",serif;letter-spacing:-.035em}.intro h1 em{color:var(--jade);font-style:normal}.intro-copy{max-width:440px;margin:0 0 5px;color:#5e6c66;font-size:13px;line-height:1.8}.training-layout{max-width:1380px;margin:auto;padding:0 clamp(20px,5vw,76px);display:grid;grid-template-columns:270px minmax(0,1fr);gap:18px}.settings-card,.practice-card,.learning-strip{background:var(--paper);border:1px solid var(--line);box-shadow:var(--shadow)}.settings-card{border-radius:22px;padding:20px;align-self:start}.section-label{display:flex;align-items:center;gap:9px}.section-label>span{display:grid;place-items:center;width:25px;height:25px;border-radius:50%;background:var(--ink);color:white;font:700 9px Georgia,serif}.section-label p{margin:0;color:var(--jade);font-size:10px;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.settings-card fieldset{border:0;margin:24px 0 8px;padding:0}.settings-card legend{margin-bottom:9px;font-size:11px;font-weight:800}.level-option{display:block;position:relative;margin-bottom:8px;cursor:pointer}.level-option input{position:absolute;opacity:0}.level-option>span{display:block;border:1px solid #e1ddd4;border-radius:12px;padding:12px 13px;transition:.18s}.level-option b,.level-option small{display:block}.level-option b{font-size:13px}.level-option small{margin-top:4px;color:var(--muted);font-size:10px}.level-option input:checked+span{border-color:rgba(45,110,97,.55);background:var(--jade-light);box-shadow:inset 3px 0 var(--jade)}.level-option input:focus-visible+span{outline:3px solid rgba(45,110,97,.2)}.sound-mode{margin-top:16px;padding-top:16px;border-top:1px solid #e8e3d8;display:flex;align-items:center;justify-content:space-between}.sound-mode b,.sound-mode small{display:block}.sound-mode b{font-size:11px}.sound-mode small{margin-top:4px;color:var(--muted);font-size:10px}.toggle{width:43px;height:24px;border:0;border-radius:20px;background:#d7d6cf;padding:3px;cursor:pointer;transition:.2s}.toggle span{display:block;width:18px;height:18px;border-radius:50%;background:white;box-shadow:0 2px 5px #999;transition:.2s}.toggle[aria-checked="true"]{background:var(--jade)}.toggle[aria-checked="true"] span{transform:translateX(19px)}.shortcut-note{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:7px 9px;margin-top:20px;padding:11px;border-radius:11px;background:#f0ede5;color:var(--muted);font-size:9px}.shortcut-note kbd{min-width:38px;border:1px solid #d7d2c7;border-bottom-width:2px;border-radius:5px;background:#fff;padding:3px 5px;text-align:center;color:var(--ink);font:700 9px inherit}.practice-card{border-radius:22px;overflow:hidden;min-width:0}.question-head{min-height:62px;padding:0 21px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e8e3d8}.attempts{display:flex;align-items:center;gap:4px}.attempts>span{width:7px;height:7px;border-radius:50%;background:var(--coral)}.attempts>span.used{background:#ddd8cf}.attempts small{margin-left:5px;color:var(--muted);font-size:9px}.listening-stage{min-height:270px;display:grid;place-items:center;align-content:center;position:relative;overflow:hidden;background:linear-gradient(180deg,#fffefa,#faf7ef)}.sound-rings{position:absolute;inset:0;display:grid;place-items:center;pointer-events:none}.sound-rings i{position:absolute;width:120px;height:120px;border:1px solid rgba(45,110,97,.12);border-radius:50%}.sound-rings i:nth-child(2){width:190px;height:190px}.sound-rings i:nth-child(3){width:260px;height:260px}.listening-stage.playing .sound-rings i{animation:pulse 1.5s ease-out infinite}.listening-stage.playing .sound-rings i:nth-child(2){animation-delay:.15s}.listening-stage.playing .sound-rings i:nth-child(3){animation-delay:.3s}@keyframes pulse{0%{transform:scale(.75);opacity:0}35%{opacity:1}100%{transform:scale(1.15);opacity:0}}.play-button{position:relative;z-index:2;width:116px;height:116px;border:0;border-radius:50%;background:var(--ink);color:white;box-shadow:0 15px 35px rgba(18,38,32,.25);cursor:pointer;transition:transform .15s,background .15s}.play-button:hover{transform:translateY(-2px);background:#1c3b32}.play-button:active{transform:scale(.98)}.play-button svg{display:block;width:30px;margin:0 auto 5px;fill:currentColor}.play-button>span{display:block;font-weight:800;font-size:12px}.play-button small{display:block;margin-top:5px;color:#bad0c7;font-size:9px}.listening-stage>p{position:relative;z-index:2;margin:20px 0 0;color:var(--muted);font-size:10px}.answer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;padding:15px 18px 18px;border-top:1px solid #eee9de}.answer-button{position:relative;border:1px solid #dedad0;border-radius:13px;background:white;padding:14px 10px;text-align:left;color:var(--ink);cursor:pointer;transition:.16s}.answer-button:hover{border-color:var(--jade);transform:translateY(-2px)}.answer-button:disabled{cursor:default;transform:none}.answer-button strong{display:block;font:700 15px Georgia,"Songti SC",serif}.answer-button small{display:block;margin-top:5px;color:var(--muted);font-size:9px}.answer-button .key{position:absolute;right:8px;top:8px;width:18px;height:18px;display:grid;place-items:center;border-radius:5px;background:#f0ede6;color:#839089;font-size:8px}.answer-button.correct{border-color:var(--jade);background:var(--jade-light)}.answer-button.wrong{border-color:var(--coral);background:#fff0ea}.feedback{margin:0 18px 18px;padding:16px;border-radius:14px;background:#edf5f1;display:grid;grid-template-columns:38px 1fr auto;align-items:center;gap:13px}.feedback[hidden]{display:none}.feedback.wrong{background:#fff0ea}.feedback-icon{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--jade);color:white}.feedback-icon::before{content:"✓";font-weight:900}.feedback.wrong .feedback-icon{background:var(--coral)}.feedback.wrong .feedback-icon::before{content:"×"}.feedback-copy>p{margin:0;color:var(--muted);font-size:9px}.feedback-copy>p:first-child{color:var(--jade);font-weight:800;letter-spacing:.08em}.feedback.wrong .feedback-copy>p:first-child{color:#b85237}.feedback h2{margin:3px 0;font:700 19px Georgia,"Songti SC",serif}.note-pills{display:flex;gap:5px;margin-top:8px}.note-pills span{border-radius:999px;background:white;padding:4px 7px;color:#52645d;font-size:9px}.next-button{border:0;border-radius:11px;background:var(--ink);color:white;padding:11px 14px;font-weight:800;white-space:nowrap;cursor:pointer}.next-button span{margin-left:8px;color:#a9c8bc}.learning-strip{max-width:calc(1380px - clamp(40px,10vw,152px));margin:18px auto 0;border-radius:18px;padding:16px 20px;display:grid;grid-template-columns:210px repeat(3,1fr);gap:20px;align-items:center}.learning-strip article{display:flex;gap:10px;align-items:flex-start}.learning-strip article+article{border-left:1px solid #e8e3d8;padding-left:20px}.learning-strip b{font-size:11px}.learning-strip article p{margin:4px 0 0;color:var(--muted);font-size:9px;line-height:1.5}.swatch{flex:none;width:9px;height:34px;border-radius:5px;background:var(--gold)}.swatch.minor{background:var(--jade)}.swatch.tense{background:var(--coral)}
@media(max-width:920px){.intro{align-items:flex-start;flex-direction:column;gap:14px}.training-layout{grid-template-columns:1fr}.settings-card{display:grid;grid-template-columns:auto 1fr auto;gap:18px;align-items:center}.settings-card fieldset{display:flex;gap:7px;margin:0}.level-option{margin:0}.level-option>span{min-width:125px}.sound-mode{margin:0;padding:0;border:0}.shortcut-note{display:none}.learning-strip{grid-template-columns:1fr 1fr}.learning-strip>.section-label{grid-column:1/3}.learning-strip article+article{border:0;padding-left:0}}@media(max-width:650px){.topbar{height:auto;min-height:72px;padding:12px 18px}.session-stats>span{min-width:0;padding:5px 8px}.session-stats>span:last-child{display:none}.brand small{display:none}.intro{padding:26px 18px 18px}.intro-copy{display:none}.training-layout{padding:0 18px}.settings-card{display:block}.settings-card fieldset{display:grid}.sound-mode{margin-top:15px;padding-top:15px;border-top:1px solid #e8e3d8}.answer-grid{grid-template-columns:1fr 1fr}.feedback{grid-template-columns:34px 1fr}.next-button{grid-column:1/3;width:100%}.learning-strip{margin:15px 18px 0;max-width:none;grid-template-columns:1fr}.learning-strip>.section-label{grid-column:auto}.listening-stage{min-height:245px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.sound-rings i{animation:none!important}.answer-button,.play-button{transition:none}}