:root{--bg:#f8faf9;--ink:#152d2b;--muted:#566b69;--accent:#14675f;--mint:#e7f5f1;--line:#ccdbd8;--white:#fff;--soft:#edf2f1;--radius:14px;--serif:Georgia,'Times New Roman','Songti SC','SimSun',serif;--sans:'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.65 var(--sans);-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:4px}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #38a899;outline-offset:5px}button{color:var(--ink)}h1,h2,h3,p{margin:0}h2{font-size:23px;line-height:1.3;letter-spacing:-.5px}h3{font-size:16px;line-height:1.5}svg{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}button:disabled{opacity:.5;cursor:wait}.site-header,main,footer{width:min(1320px,calc(100% - 88px));margin-inline:auto}.site-header{height:108px;display:flex;align-items:center;gap:35px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);line-height:1.1;font:bold 25px var(--serif)}.brand svg{width:40px;height:44px;stroke-width:2.4}.brand-sub{display:block;font:10px var(--sans);color:var(--muted);letter-spacing:2px;margin-top:6px}.site-header nav{display:flex;gap:28px;margin:auto;font-size:14px}.site-header nav a{padding:8px 0;color:var(--ink);text-decoration:none}.site-header nav .nav-listen{border-bottom:2px solid var(--accent)}.language{background:none;border:0;font-size:14px;min-width:74px;padding:10px;text-align:right}.language span{margin-left:6px;color:var(--muted)}.workspace{display:grid;grid-template-columns:minmax(300px,.75fr) minmax(560px,1.3fr);gap:54px;padding:48px 0 44px;align-items:start}.scenario h1{font-size:clamp(32px,3.3vw,49px);line-height:1.38;letter-spacing:-1.5px;font-weight:650;margin:3px 0 22px}.scenario h1 em{font-style:normal;color:var(--accent)}html[lang=en] .scenario h1{font-family:var(--serif);font-size:clamp(40px,4.35vw,62px);line-height:1.07;letter-spacing:-2.6px;font-weight:600}.intro{font-size:17px;line-height:1.8;color:#435957;margin-bottom:30px;max-width:31em}.scene-heading{display:flex;align-items:center;gap:10px;font-size:12px;margin-bottom:14px}.scene-heading>span:first-child{font:600 13px var(--sans);color:var(--accent)}.scene-heading h2{font-size:17px;letter-spacing:0}.duration-label{color:var(--muted);margin-left:auto;white-space:nowrap}.trajectory{display:flex;gap:14px;align-items:center}.trajectory>div{flex:1;min-height:114px;display:flex;flex-direction:column;justify-content:center;padding:15px 17px;background:var(--soft);border-radius:10px}.trajectory>div:last-child{background:#dcf0eb}.trajectory svg{width:27px;height:25px;flex-shrink:0}.trajectory strong{font-size:17px;line-height:1.5;display:block;margin:4px 0}.trajectory span{font-size:12px;color:var(--muted)}.trajectory .small-label{font-size:10px;letter-spacing:1px}.goal-note{font-size:12px;line-height:1.8;color:var(--muted);margin:14px 0 25px}.guide{border-top:1px solid var(--line);padding-top:25px}.guide h2{font-size:21px}.guide ol{list-style:none;padding:0;margin:22px 0}.guide li{display:flex;gap:16px;margin:0 0 23px}.step{border-radius:50%;background:#c5e7df;width:35px;height:35px;display:grid;place-items:center;font:22px var(--serif);flex-shrink:0}.guide h3{font-size:15px;margin:0 0 4px}.guide p{font-size:13px;color:var(--muted);line-height:1.75}.headphone-note{display:flex;align-items:center;gap:9px}.headphone-note svg{width:17px;height:17px;flex-shrink:0}.listening-console{border:1px solid #b8ceca;border-radius:var(--radius);padding:24px;background:linear-gradient(145deg,#fff8,var(--bg));min-width:0}.console-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.console-top h2{font-size:24px}.format{font-size:11px;color:var(--muted);white-space:nowrap;letter-spacing:.3px}.round-control{display:flex;gap:15px;align-items:center;justify-content:space-between;margin-top:20px;font-size:12px;color:var(--muted)}.segmented{display:flex;border:1px solid var(--line);background:var(--soft);padding:3px;border-radius:8px;flex-shrink:0}.segmented button{padding:6px 15px;border:0;background:transparent;border-radius:5px;font-size:12px}.segmented button[aria-pressed=true]{background:var(--white);color:var(--accent);box-shadow:0 1px 3px #102d2a18;font-weight:650}.round-info{font-size:11px;color:var(--muted);margin:9px 0 16px;min-height:18px}.audio-list{display:grid;gap:11px}.track{padding:16px;border:1px solid var(--line);border-radius:10px;transition:background .18s,border-color 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i.passed{background:var(--accent)}.track-timing{display:flex;gap:8px;align-items:center;line-height:1;font-variant-numeric:tabular-nums;margin-top:5px}.track-timing time{font-size:10px;min-width:25px;color:var(--muted)}input[type=range]{accent-color:var(--accent);height:16px;cursor:pointer;margin:0;min-width:0}.seek{width:100%;flex:1}.transport-options{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:18px}.switch-label{display:flex;align-items:center;gap:9px;font-size:11px;cursor:pointer;position:relative}.switch-label input{position:absolute;left:0;width:34px;height:22px;opacity:0}.switch-ui{width:32px;height:19px;border-radius:12px;background:#a2b4b0;position:relative;flex-shrink:0}.switch-ui:after{content:'';position:absolute;width:13px;height:13px;background:white;left:3px;top:3px;border-radius:50%;transition:transform .15s}.switch-label input:checked+.switch-ui{background:var(--accent)}.switch-label input:checked+.switch-ui:after{transform:translateX(13px)}.switch-label input:focus-visible+.switch-ui{outline:3px solid #38a899;outline-offset:4px}.text-button{border:0;background:transparent;padding:6px 0;color:var(--accent);font-size:11px}.text-button:hover{text-decoration:underline}.volume-row{display:flex;gap:12px;align-items:center;margin-top:8px;color:var(--muted);font-size:11px}.volume-row input{max-width:120px;width:30%}.volume-row output{font-variant-numeric:tabular-nums}.playback-status{font-size:11px;color:var(--accent);margin-top:12px;min-height:18px}.clip-note{font-size:10px;line-height:1.65;color:var(--muted);margin-top:7px}.changes{margin-top:23px;border-top:1px solid var(--line);padding-top:20px}.changes h3{font-size:20px;letter-spacing:-.3px}.changes>p{font-size:12px;color:var(--muted);margin:5px 0 12px}.role-table,.score-table{border-collapse:collapse;width:100%;table-layout:fixed;font-size:11px}.role-table th,.role-table td{padding:11px 8px;border-bottom:1px solid var(--line);text-align:center}.role-table thead{background:var(--soft)}.role-table th:first-child{width:45%;text-align:left;font-weight:500}.role-table td{color:var(--muted)}.role-table .replaced{color:var(--accent);font-weight:650}.results{margin-top:19px;border:1px solid var(--line);border-radius:9px;background:#edf3f180}.results summary{padding:16px;display:flex;align-items:center;justify-content:space-between;list-style:none;cursor:pointer;gap:14px}.results summary::-webkit-details-marker,.method summary::-webkit-details-marker{display:none}.results summary strong{font-size:14px;display:block}.results summary small{font-size:10px;color:var(--muted);display:block;margin-top:3px}.results summary svg,.method summary svg{height:19px;width:19px;flex-shrink:0;transition:transform .2s}details[open]>summary svg{transform:rotate(180deg)}.results-body{border-top:1px solid var(--line);padding:17px}.results-lead{font-size:14px;font-weight:600;line-height:1.65}.score-caption{font-size:11px;color:var(--muted);margin:9px 0}.score-table th,.score-table td{border-bottom:1px solid var(--line);padding:9px 5px;text-align:center}.score-table th:first-child{text-align:left;width:62%;font-weight:500}.score-table td{font-size:14px;font-weight:600;color:var(--accent)}.score-table thead th{font-size:11px;color:var(--muted)}.result-note{font-size:11px;line-height:1.8;margin-top:13px}.result-note strong{color:var(--accent)}.result-boundary{font-size:11px;margin-top:13px;padding-top:12px;border-top:1px solid var(--line);color:var(--muted)}.takeaway{border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:32px;padding:35px 0}.takeaway>div+div{border-left:1px solid var(--line);padding-left:30px}.takeaway h2{font-size:25px;line-height:1.5}.takeaway h3{font-size:16px;margin:5px 0 10px}.takeaway p{font-size:13px;color:var(--muted);line-height:1.8;margin-top:8px}.method{margin:22px 0 8px}.method summary{display:flex;justify-content:space-between;align-items:center;cursor:pointer;font-size:12px;color:var(--muted);padding:7px 0;list-style:none}.method-body{display:grid;grid-template-columns:1fr 1fr;gap:45px;padding:25px 0;font-size:12px;color:var(--muted)}.method-body p{margin-top:12px;line-height:1.85}.method-body h3{font-size:14px;color:var(--ink)}.manifest-link{display:inline-block;margin-top:12px}.site-header nav a:hover,footer a:hover{color:var(--accent)}footer{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);margin-top:20px;padding:21px 0 26px;font-size:11px;color:var(--muted)}footer>span:first-child{font-family:var(--serif);font-size:14px;color:var(--ink)}.footer-dot{margin:0 12px;color:#9bb2ac}footer a{font-size:11px;color:var(--muted)}.skip-link{position:fixed;top:10px;left:10px;transform:translateY(-160%);padding:10px;background:var(--white);z-index:5}.skip-link:focus{transform:translateY(0)}.noscript-note{padding:20px;border:1px solid var(--line);margin:20px}.track-error{color:#9b392f;font-size:12px;margin-top:8px}.track-download{font-size:10px;color:var(--muted)}
@media(min-width:1500px){.workspace{gap:65px}.site-header,main,footer{width:min(1380px,calc(100% - 110px))}.scenario h1{font-size:49px}}
@media(max-width:1100px){.site-header,main,footer{width:calc(100% - 48px)}.workspace{grid-template-columns:minmax(275px,.8fr) minmax(475px,1.25fr);gap:30px}.listening-console{padding:19px}.scenario h1{font-size:33px}.intro{font-size:15px}.site-header nav{gap:18px}.brand{font-size:22px}.trajectory{gap:9px}.trajectory>div{padding:12px}.takeaway{gap:20px}.takeaway>div+div{padding-left:20px}}
@media(max-width:850px){.site-header{height:90px;gap:15px}.site-header nav{gap:16px;font-size:12px}.brand{font-size:21px}.brand-sub{font-size:9px;letter-spacing:1px}.workspace{grid-template-columns:1fr;gap:32px;padding-top:32px}.scenario h1{font-size:38px;max-width:650px;line-height:1.35}html[lang=en] .scenario h1{font-size:53px;max-width:650px}.intro{max-width:640px}.scene-heading,.trajectory,.goal-note{max-width:650px}.guide ol{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.guide li{gap:10px;margin:0}.guide li p{font-size:12px}.guide h3{font-size:14px}.step{width:29px;height:29px;font-size:19px}.console-top h2{font-size:25px}.takeaway{grid-template-columns:1fr 1fr}.takeaway>div:first-child{grid-column:1/-1}.takeaway>div:nth-child(2){border-left:0;padding-left:0}.track-purpose{max-width:none}.track-timing time{font-size:11px}.clip-note{font-size:11px}.method-body{gap:24px}.role-table{font-size:12px}}
@media(max-width:560px){.site-header,main,footer{width:calc(100% - 36px)}.site-header{height:81px}.brand{font-size:22px;gap:8px}.brand svg{width:29px;height:35px}.site-header nav{display:none}.language{margin-left:auto;font-size:13px;min-width:55px}.workspace{padding-top:26px;gap:27px}.scenario h1{font-size:33px;letter-spacing:-1px;margin-bottom:16px}html[lang=en] .scenario h1{font-size:45px;letter-spacing:-1.8px}.intro{font-size:14px;line-height:1.9;margin-bottom:22px}.scene-heading h2{font-size:15px}.duration-label{font-size:10px}.trajectory>div{padding:12px;min-height:99px}.trajectory strong{font-size:16px}.trajectory span{font-size:11px}.goal-note{font-size:11px}.guide{padding-top:20px}.guide h2{font-size:19px}.guide ol{display:block;margin:18px 0}.guide li{margin-bottom:17px;gap:13px}.guide li p{font-size:12px}.guide h3{font-size:14px}.headphone-note{font-size:11px!important}.listening-console{padding:16px 13px;border-radius:12px}.console-top h2{font-size:22px}.format{font-size:10px}.round-control{font-size:11px;gap:8px;margin-top:17px}.segmented button{font-size:11px;padding:6px 11px}.round-info{font-size:10px;margin:9px 0 13px}.track{padding:13px 11px}.track-title{font-size:15px}.track-title .track-code{font-size:10px}.track-purpose{font-size:10px;max-width:110px}.play-button{width:42px;height:42px}.track-player{gap:11px}.waveform{gap:1px;height:29px}.transport-options{gap:8px}.switch-label{font-size:10px;gap:6px}.text-button{font-size:10px}.volume-row{margin-top:11px}.clip-note{font-size:10px}.changes{margin-top:19px}.changes h3{font-size:18px}.changes>p{font-size:11px}.role-table{font-size:10px}.role-table th,.role-table td{padding:10px 6px}.role-table th:first-child{width:46%}.results summary{padding:13px}.results summary strong{font-size:13px}.results summary small{font-size:10px}.results-body{padding:12px}.score-table th:first-child{width:64%}.takeaway{grid-template-columns:1fr;gap:19px;padding:27px 0}.takeaway>div+div{border-left:0;padding-left:0}.takeaway h2{font-size:23px}.takeaway h3{font-size:15px;margin:0 0 4px}.takeaway p{font-size:12px;margin-top:5px}.method-body{grid-template-columns:1fr;gap:24px}.method summary{font-size:11px}footer{flex-wrap:wrap;gap:12px;font-size:10px;margin-top:16px}footer>span:nth-child(2){order:3;width:100%}footer>span:first-child{font-size:13px}.track-download{font-size:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}