/* Echo: shared Miko-inspired surfaces and navigation. */
:root{--paper:#f8f8f6;--surface:#fff;--ink:#0d0d0f;--muted:#666;--line:#e7e7e4;--soft:#f5f5f3;--blue:#eff6ff;--round:32px;--font-body:-apple-system,"SF Pro Text","PingFang SC","Microsoft YaHei",system-ui,sans-serif;--font-round:ui-rounded,"SF Pro Rounded","Arial Rounded MT Bold","Yuanti SC","PingFang SC",system-ui,sans-serif}
[hidden]{display:none!important}
html{scroll-padding-top:24px}
body{overflow-wrap:break-word}
button,input,select,textarea{font:inherit}
a{color:inherit;text-underline-offset:4px}
button,a,input{-webkit-tap-highlight-color:transparent}
button{touch-action:manipulation}
button:disabled{opacity:.5;cursor:not-allowed;transform:none!important}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #2862b7;outline-offset:4px}
.skip{position:absolute;top:-100px;left:20px;z-index:100;background:var(--ink);color:white;padding:10px 18px;border-radius:99px}
.skip:focus{top:12px}
.top{gap:16px;flex-wrap:wrap}
.nav{display:flex;gap:8px;align-items:center;background:#efefec;border-radius:99px;padding:4px}
.nav a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;border-radius:99px;font-size:14px;white-space:nowrap}
.nav a:hover{background:#fff8}
.nav a.on,.nav a[aria-current=page]{background:var(--surface);color:var(--ink);box-shadow:0 1px 4px #00000008;font-weight:700}
#who{display:inline-flex;align-items:center;justify-content:center;min-height:44px;max-width:160px;padding:0 16px;border:1px solid var(--line);border-radius:99px;background:var(--surface);color:var(--ink)!important;font:600 14px var(--font-body)!important;text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pill,.btn,.chip{display:inline-flex;align-items:center;justify-content:center;min-height:44px;text-decoration:none}
.btn.primary,.btn.solid,.button{background:var(--ink);color:#fff;border-color:var(--ink)}
.btn small{opacity:1;color:inherit;font-size:12px;font-weight:400}
.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:50px;padding:12px 24px;border:1px solid var(--ink);border-radius:99px;font-family:var(--font-round);font-weight:700;text-decoration:none;transition:transform .16s,box-shadow .16s}
.button:hover{transform:translateY(-2px);box-shadow:0 5px 12px #00000012}
.button.secondary{background:var(--surface);border-color:var(--line);color:var(--ink)}
.hero-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:26px}
.eyebrow{font-size:13px;letter-spacing:1.6px}
.foot{gap:16px;flex-wrap:wrap}
.section-title{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin:32px 0 20px}
.section-title h2{font:800 24px/1.3 var(--font-round);margin:0;letter-spacing:-.4px}
.section-title p{color:var(--muted);font-size:14px;margin:0}
.help-text{font-size:14px;color:var(--muted);line-height:1.7}
.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}
/* Start with content, keep learning guidance optional. */
.home-hero{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(240px,.75fr);align-items:center;gap:32px;padding:56px 8px 44px}
.home-hero h1{font-size:clamp(36px,4.3vw,54px);line-height:1.2}
.home-hero .sub{max-width:32em}
.echo-art{width:100%;max-width:270px;justify-self:center;transform:rotate(5deg);filter:drop-shadow(0 7px 4px #0000000b)}
.practice-path{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:36px}
.path-card{padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:28px}
.path-card:nth-child(2){background:var(--blue)}
.path-card .step{font:700 13px var(--font-round);color:var(--muted)}
.path-card h3{font:800 20px/1.4 var(--font-round);margin:12px 0 8px}
.path-card p{font-size:14px;color:var(--muted);margin:0;line-height:1.75}
.path-note{font-size:14px;color:var(--muted);margin:14px 0 0}
/* Library filters stay legible and preserve their grouping. */
.library-page .head{padding-bottom:30px}
.library-page .filters{display:flex;align-items:flex-end;gap:16px;padding:20px;margin:0 0 24px;background:var(--surface);border:1px solid var(--line);border-radius:28px}
.filter-group{border:0;padding:0;margin:0;min-width:0}
.filter-group legend,.search-group label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:8px}
.filter-options{display:flex;flex-wrap:wrap;gap:8px}
.library-page .chip{background:var(--soft);font-size:14px;min-height:44px}
.library-page .chip.on{background:var(--ink);color:#fff}
.search-group{flex:1 1 240px;min-width:180px}
.library-page .search{width:100%;font-size:16px;min-height:44px;min-width:0}
.library-page .count{margin:0 0 8px;font-variant-numeric:tabular-nums}
.badge{font-size:12px}
/* Player: controls belong to the content, never float over it. */
.watch-page{padding-bottom:0}
.watch-page .wrap{padding-bottom:40px}
.watch-page .head{padding:32px 0 24px;align-items:flex-start}
.watch-page h1{max-width:38ch}
.watch-page .grid{grid-template-columns:minmax(0,1.45fr) minmax(340px,1fr)}
.watch-page .stage{padding:16px;min-width:0}
.watch-page .lines{height:520px;position:relative;overscroll-behavior:contain;scroll-padding:16px}
.watch-page .t-head{padding:16px 20px;gap:8px}
.watch-page .shadow{position:static;display:flex;flex-wrap:wrap;padding:18px 0 2px;gap:12px}
.watch-page .wave{min-width:32px;max-width:80px}
.watch-page .take{width:100%;justify-content:flex-start;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:12px;font-size:13px}
.watch-page .transport{gap:8px;padding-top:16px}
.watch-page .clock{display:block;width:100%;padding:4px 2px}
.watch-page .mic-hint{flex:1;min-width:160px}
.watch-page .mic-hint b{font-size:15px}
.watch-page .mic-hint span{font-size:13px}
.watch-page .toast{bottom:24px;max-width:calc(100% - 40px);width:max-content;border-radius:18px;text-align:center;z-index:30}
.practice-prompt{margin-top:20px;background:var(--blue);border:1px solid var(--line);border-radius:28px;padding:24px}
.practice-prompt h2{font:800 21px/1.4 var(--font-round);margin:0 0 8px}
.practice-prompt p{font-size:15px;margin:0;color:#535353}
.practice-prompt details{margin-top:12px}
.practice-prompt summary{min-height:44px;padding:10px 0;font-size:14px;font-weight:600;cursor:pointer}
.practice-prompt ul{padding-left:22px;margin:8px 0;font-size:15px;line-height:1.85}
.practice-prompt .help-text{font-size:13px;margin-top:12px}
.watch-page .en{line-height:1.85}
.watch-page .zh{font-size:14px}
.watch-page .sentence-jump{font:600 12px var(--font-body);min-width:44px;min-height:44px;border:1px solid var(--line);border-radius:99px;background:var(--soft);color:var(--muted);margin-bottom:6px;cursor:pointer;padding:0 12px}
.watch-page .w:focus-visible{outline-offset:2px}
.watch-page .grid.transcript-hidden{grid-template-columns:minmax(0,1fr);max-width:860px;margin:0 auto}
.watch-page .grid.transcript-hidden .transcript{display:none}
.review-page .wrap{max-width:1160px;padding-top:28px}
.review-page .stats{gap:16px}
.review-page .stat span{font-size:14px}
.review-page .stat{min-width:150px}
.review-page .review{max-width:760px;margin:auto}
.review-page .actions .btn{display:flex;flex-direction:column;gap:3px;padding:10px 18px}
.review-page .list{max-width:760px;margin:36px auto 0}
.review-page .list h2{font-size:18px;letter-spacing:0;color:var(--ink)}
.review-page .item{flex-wrap:wrap}
.review-page .item .zh{min-width:100px}
.login-page .card{padding:36px}
.login-page h1{font-size:32px}
.login-page .sub{font-size:15px}
.login-page .note{font-size:14px}
.login-page .swap button{width:auto;min-height:44px;margin:0;padding:4px 8px;background:none;color:var(--ink);border:0;border-radius:8px;text-decoration:underline;font-size:14px}
@media(max-width:900px){
 .wrap{padding-left:20px;padding-right:20px}
 .top .nav{display:flex;order:3;flex:1 0 100%;justify-content:center;margin-top:4px}
 .top .nav a{flex:1;padding:0 12px}
 .top>.brand{margin-right:auto}
 .top>#who{margin-left:auto;margin-right:0!important}
 .home-hero{padding:40px 0 28px;grid-template-columns:1fr 180px;gap:16px}
 .home-hero h1{font-size:36px}
 .practice-path{grid-template-columns:1fr;gap:12px}
 .path-card{padding:20px 24px}
 .path-card h3{margin:6px 0}
 .watch-page .grid{grid-template-columns:1fr}
 .watch-page .lines{height:460px;max-height:65vh}
 .watch-page .shadow{position:static;padding:16px 0 2px;background:none}
 .watch-page .btn{min-height:44px;font-size:14px}
 .watch-page .head .meta{white-space:normal}
 .review-page .stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
 .review-page .stat{min-width:0;padding:20px}
}
@media(max-width:600px){
 .home-hero{grid-template-columns:1fr;position:relative;padding-top:36px}
 .echo-art{display:none}
 .home-hero h1{font-size:38px}
 .home-hero .sub{font-size:16px}
 .section-title{align-items:flex-start;flex-wrap:wrap;gap:8px}
 .section-title h2{font-size:22px}
 .hero-actions .button{flex:1}
 .library-page .head{padding:32px 0 24px}
 .library-page .filters{padding:18px;gap:18px}
 .library-page .filter-group{width:100%}
 .library-page .count{margin:0}
 .watch-page .stage{padding:12px;border-radius:28px}
 .watch-page .video{border-radius:20px}
 .watch-page .head h1{font-size:25px}
 .watch-page .head .meta{font-size:13px}
 .watch-page .wave{display:none}
 .watch-page .btn{padding:0 12px}
 .watch-page .mic{width:48px;height:48px}
 .watch-page .mic-hint{min-width:140px}
 .practice-prompt{padding:20px}
 .review-page .qmeta{flex-wrap:wrap;gap:8px}
 .review-page .actions .btn{flex:1 1 40%}
 .review-page .word{overflow-wrap:anywhere}
 .review-page .review{padding:24px}
 .login-page{padding:20px}
 .login-page .card{padding:28px 24px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.sync-note{display:flex;align-items:center;gap:12px;justify-content:space-between;margin:18px 0 0;padding:16px 20px;border:1px solid var(--line);border-radius:24px;background:var(--blue);font-size:14px}.sync-note span{flex:1}.sync-note .btn{flex-shrink:0}#wbCount{margin-left:6px;font-variant-numeric:tabular-nums}

.select-group label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:8px}
.select-group select{width:100%;min-height:44px;padding:0 32px 0 14px;border:1px solid var(--line);border-radius:99px;background:var(--surface);color:var(--ink);font-size:15px}
.select-group select:focus-visible{outline:3px solid #2862b7;outline-offset:3px}
.advanced-filters{flex-basis:100%;border-top:1px solid var(--line);padding-top:8px}
.advanced-filters summary{font-size:14px;cursor:pointer;min-height:44px;padding:10px 0}
.advanced-filters>.filter-options{gap:24px;padding:12px 0 0}
.library-page .count{margin-left:auto}
@media(max-width:600px){.library-page .search-group{flex-basis:100%}.select-group{flex:1;min-width:130px}.library-page .advanced-filters .filter-group{width:auto}}

.wordcard-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}.wordcard-heading h3{overflow-wrap:anywhere}

.resume-card{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 28px;margin:16px 0 30px;border:1px solid var(--line);border-radius:32px;background:var(--blue)}
.resume-card .eyebrow{margin:0 0 8px}.resume-card h2{font:800 22px/1.4 var(--font-round);margin:0 0 8px}.resume-card h2 a{text-decoration:none}.resume-card p:last-child{font-size:14px;color:var(--muted);margin:0}.resume-card .button{flex-shrink:0}
.progress-note{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--muted);padding:12px 2px 0}.progress-note>span{flex:1 1 200px}.progress-note .btn{font-size:13px}
@media(max-width:600px){.resume-card{display:block;padding:24px}.resume-card .button{margin-top:16px}.resume-card h2{font-size:20px}}