#r3Root{--r3-green:#71be3e;--r3-deep:#287035;--r3-forest:#174c29;--r3-red:#ed1c24;--r3-yellow:#ffd65a;--r3-ink:#183322;--r3-muted:#627166;--r3-bg:#f3f7ef;--r3-line:#dce7d7;--r3-shadow:0 16px 44px rgba(29,72,39,.12);min-height:100vh;background:var(--r3-bg);color:var(--r3-ink);font-family:"Segoe UI","Noto Sans SC","Microsoft YaHei",sans-serif}
.r2-app-controls[hidden],.r2-footer[hidden],#r2RoleView[hidden],.app[hidden]{display:none!important}
#r3Root *{box-sizing:border-box}#r3Root button,#r3Root input,#r3Root textarea,#r3Root select{font:inherit}#r3Root button{min-height:44px;cursor:pointer}.r3-app{min-height:100vh;display:grid;grid-template-columns:286px minmax(0,1fr)}.r3-side{height:100vh;position:sticky;top:0;overflow:auto;background:linear-gradient(180deg,var(--r3-deep),var(--r3-forest));color:#fff;padding:18px 16px}.r3-brand{display:flex;gap:10px;align-items:center}.r3-brand img{width:74px;height:46px;object-fit:contain;background:#fff;border-radius:10px;padding:4px}.r3-brand b{display:block}.r3-brand small,.r3-course small{color:#cbe8ce}.r3-course{margin-top:17px;background:#ffffff17;padding:13px;border-radius:14px}.r3-course strong{display:block;margin-top:7px}.r3-course .r3-zh{display:flex;flex-wrap:wrap}.r3-course .r3-zh small,.r3-course .r3-zh i{color:#d9f1dc}.r3-label{font-size:10px;letter-spacing:.1em;color:#bce0c0;font-weight:800;margin:15px 7px 7px}.r3-lessons{display:grid;grid-template-columns:repeat(6,1fr);gap:5px}.r3-lessons button{border:0;border-radius:9px;background:#ffffff18;color:#fff;font-weight:900;min-height:38px}.r3-lessons button.on{background:var(--r3-yellow);color:#213c25}.r3-roadmap{display:grid;gap:4px}.r3-roadmap button{border:0;background:transparent;color:#edf8ee;display:grid;grid-template-columns:30px 1fr 18px;gap:9px;align-items:center;text-align:left;padding:8px;border-radius:12px}.r3-roadmap button:hover{background:#ffffff12}.r3-roadmap button.on{background:#fff;color:var(--r3-forest);box-shadow:0 9px 25px #0003}.r3-roadmap button>span{width:30px;height:30px;border-radius:9px;background:#ffffff18;display:grid;place-items:center;font-weight:900}.r3-roadmap button.on>span{background:var(--r3-yellow)}.r3-roadmap b{font-size:12px;line-height:1.2}.r3-roadmap small{display:block;font-size:10px;font-weight:500;opacity:.72;margin-top:3px}.r3-roadmap i{font-style:normal}.r3-encourage{display:flex;gap:9px;align-items:center;background:#ffffff14;border-radius:13px;padding:10px;margin-top:15px;font-size:11px;line-height:1.35}.r3-encourage b{width:38px;height:38px;display:grid;place-items:center;background:var(--r3-yellow);color:var(--r3-forest);border-radius:11px;flex:none}.r3-work{min-width:0}.r3-top{min-height:76px;position:sticky;top:0;z-index:120;background:#fffc;border-bottom:1px solid var(--r3-line);backdrop-filter:blur(10px);display:grid;grid-template-columns:minmax(150px,1fr) minmax(150px,260px) auto;gap:18px;align-items:center;padding:10px 24px}.r3-top-title b,.r3-top-title small{display:block}.r3-top-title small{color:var(--r3-muted)}.r3-progress{display:grid;grid-template-columns:1fr 38px;gap:9px;align-items:center}.r3-progress div{height:9px;background:#e1eadc;border-radius:9px;overflow:hidden}.r3-progress span{display:block;height:100%;background:var(--r3-green)}.r3-progress b{font-size:12px;text-align:right}.r3-top-actions,.r3-role,.r3-lang{display:flex;gap:7px;align-items:center}.r3-top button,.r3-methods button,.r3-stagebar button,.r3-practice-tabs button,.r3-lex-tabs>button{border:1px solid var(--r3-line);background:#fff;border-radius:12px;padding:9px 12px}.r3-role [aria-pressed=true],.r3-methods .on,.r3-stagebar .on,.r3-practice-tabs .on,.r3-lex-tabs .on{background:var(--r3-deep);border-color:var(--r3-deep);color:#fff}.r3-layout{display:grid;grid-template-columns:minmax(0,1fr) 292px;gap:20px;padding:22px;max-width:1540px;margin:auto}.r3-stage-shell{background:#fff;border-radius:20px;box-shadow:var(--r3-shadow);overflow:hidden;min-width:0}.r3-accent{height:7px;background:linear-gradient(90deg,var(--r3-green) 0 72%,var(--r3-red) 72% 84%,var(--r3-yellow) 84%)}.r3-stage-inner{padding:28px;min-height:650px}.r3-kind{display:block;font-size:12px;color:var(--r3-deep);font-weight:850;margin-bottom:8px}.r3-stage-inner>h1{font-size:clamp(28px,3vw,42px);letter-spacing:-.03em;line-height:1.08;margin:0 0 9px;max-width:22ch}.r3-lead{margin:0 0 20px;color:var(--r3-muted);line-height:1.55}.r3-visual{height:250px;border-radius:17px;background:#dfeeda;position:relative;overflow:hidden;margin:0 0 20px}.r3-visual img{width:100%;height:100%;object-fit:cover;display:block}.r3-visual:after{content:"";position:absolute;inset:45% 0 0;background:linear-gradient(transparent,#0b2d1f88)}.r3-visual figcaption{position:absolute;z-index:2;left:14px;bottom:14px;padding:7px 10px;border-radius:9px;background:#fff;font-size:12px;font-weight:850}.r3-task{max-width:920px}.r3-comp{display:grid;align-content:start;gap:13px}.r3-panel{background:#fff;padding:17px;border-radius:16px;box-shadow:0 8px 24px #1d482712}.r3-panel h2{font-size:16px;margin:0 0 12px}.r3-panel p{font-size:13px;line-height:1.5;color:var(--r3-muted);margin:0}.r3-cheer{background:#fff8d8}.r3-checks{display:grid;gap:9px}.r3-checks div{display:grid;grid-template-columns:22px 1fr;gap:8px;font-size:12px;line-height:1.4}.r3-checks i{font-style:normal;width:21px;height:21px;border-radius:7px;background:#edf2ea;display:grid;place-items:center;color:#7c897d;font-weight:900}.r3-checks .on i{background:#ddf2cf;color:var(--r3-deep)}
.r3-activity-nav{border-top:1px solid var(--r3-line);padding:15px 20px;display:flex;justify-content:space-between;align-items:center;gap:10px}.r3-activity-nav button{border:1px solid var(--r3-line);background:#fff;border-radius:12px;padding:10px 15px;font-weight:850}.r3-activity-nav button:last-child{background:var(--r3-deep);border-color:var(--r3-deep);color:#fff}.r3-activity-nav button:disabled{opacity:.4}.r3-activity-nav span{font-size:12px;color:var(--r3-muted)}.r3-card,.r3-resource,.r3-teacher-grid article,.r3-assignment{background:#f8fbf6;border:1px solid var(--r3-line);border-radius:16px;padding:20px;margin-top:15px}.r3-card:first-child{margin-top:0}.r3-card textarea,.r3-card input,.r3-card select{width:100%;padding:12px;border:1px solid #bdd0b7;border-radius:11px;margin:8px 0;background:#fff}.r3-card button,.r3-teacher button{border:0;border-radius:11px;padding:10px 14px;background:var(--r3-deep);color:#fff;font-weight:750;margin:4px}.r3-card button:disabled{background:#bbc5b7}.r3-zh{display:inline-grid;vertical-align:middle;gap:1px;margin:2px 5px}.r3-zh b{font-size:1.05em}.r3-zh i{font-style:normal;color:#2369a1;font-size:12px}.r3-zh small{color:#66746a}.r3-no-pinyin .r3-pinyin{display:none}.r3-no-meaning .r3-meaning{display:none}.r3-lex-tabs,.r3-stagebar,.r3-practice-tabs,.r3-methods{display:flex;gap:7px;flex-wrap:wrap}.r3-lex-tabs>button{display:grid;color:inherit}.r3-stagebar{margin:14px 0}.r3-stagebar span{padding:7px;border-radius:10px;background:#e8eee5}.r3-practice-tabs button{color:var(--r3-ink)}.r3-practice-tabs b{display:block}.r3-item{background:#fff;border:1px solid #dbe7d7;padding:15px;border-radius:14px;margin:10px 0}.r3-choices button.selected{outline:3px solid #f0b71c}.r3-feedback{font-weight:750;color:#2f7830}.r3-teacher-wrap{padding:22px;max-width:1540px;margin:auto}.r3-teacher{padding:0}.r3-teacher-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.r3-teacher-grid article{background:#fff;box-shadow:0 8px 24px #1d48270d}.r3-resource.present{position:fixed;inset:12px;z-index:200;font-size:1.25rem;overflow:auto;background:#fff}.r3-resource.present li{margin:22px}.r3-footer{display:flex;justify-content:space-between;gap:12px;padding:13px 18px;background:var(--r3-forest);color:#fff;font-size:12px}.r3-footer a{color:#fff}.r3-hidden-answer{border:2px dashed #8eaa83;padding:18px;border-radius:12px}.r3-orphan{outline:3px solid #d00}
@media(max-width:1100px){.r3-app{grid-template-columns:250px 1fr}.r3-layout{grid-template-columns:1fr}.r3-comp{grid-template-columns:1fr 1fr}.r3-cheer{grid-column:1/-1}.r3-top{grid-template-columns:1fr auto}.r3-progress{display:none}.r3-top-actions{grid-column:1/-1;justify-content:space-between}.r3-teacher-grid{grid-template-columns:1fr 1fr}}
@media(max-width:760px){.r3-app{display:block}.r3-side{height:auto;position:relative;padding:14px}.r3-course,.r3-label,.r3-roadmap,.r3-encourage{display:none}.r3-brand{margin-bottom:10px}.r3-lessons{max-width:420px}.r3-top{position:relative;grid-template-columns:1fr;padding:12px}.r3-top-actions{display:grid;grid-template-columns:1fr}.r3-role,.r3-lang{justify-content:center}.r3-layout,.r3-teacher-wrap{padding:12px;gap:12px}.r3-stage-inner{padding:20px;min-height:0}.r3-visual{height:220px}.r3-comp{grid-template-columns:1fr}.r3-teacher-grid{grid-template-columns:1fr}.r3-footer{display:grid}.r3-stagebar{flex-wrap:nowrap;overflow:auto}.r3-card{padding:15px}}
.tp-segment{margin:0 0 22px;padding:20px;border:1px solid #cfe1ca;border-radius:18px;background:linear-gradient(145deg,#f3faef,#fff9e8);box-shadow:0 10px 28px rgba(38,104,52,.1)}.tp-segment header{display:flex;align-items:center;gap:12px;margin-bottom:14px}.tp-segment header small{display:block;color:var(--r3-deep);font-size:11px;font-weight:900;letter-spacing:.08em}.tp-segment h2{margin:2px 0 0;font-size:21px}.tp-avatar{width:48px;height:48px;display:grid;place-items:center;border-radius:15px;background:var(--r3-deep);color:#fff;font-weight:900}.tp-media-status{display:grid;grid-template-columns:38px 1fr;column-gap:10px;align-items:center;padding:12px;border-radius:13px;background:#fff;border:1px dashed #a9c6a1}.tp-media-status>span{grid-row:1/3;font-size:24px}.tp-media-status b,.tp-media-status small{display:block}.tp-media-status small{color:var(--r3-muted)}.tp-teacher-value{font-size:15px;line-height:1.55}.tp-segment ol{padding-left:22px}.tp-segment li{margin:7px 0}.tp-example,.tp-watch,.tp-next{padding:13px 15px;border-radius:13px;margin-top:10px}.tp-example{background:#e9f5e3}.tp-watch{background:#fff0ee}.tp-next{background:#fff4c9;border-left:5px solid var(--r3-yellow)}.tp-example p,.tp-watch p,.tp-next p{margin:5px 0 0;line-height:1.5}.tp-video{display:block;width:100%;max-height:420px;border-radius:14px;background:#102b1a}
.tp-flow{margin-bottom:24px;padding:18px;border:1px solid #c8ddc1;border-radius:18px;background:#f8fcf6}.tp-flow-progress{display:grid;grid-template-columns:repeat(6,1fr);gap:7px;margin-bottom:16px}.tp-flow-progress span{height:34px;display:grid;place-items:center;border-radius:10px;background:#e3eae0;color:#70806f;font-weight:900}.tp-flow-progress span.on{background:var(--r3-yellow);color:#243d28}.tp-flow-progress span.done{background:#d8efcc;color:var(--r3-deep)}.tp-practice-head>span{font-size:11px;font-weight:900;color:var(--r3-deep);letter-spacing:.08em}.tp-practice-head h2{margin:4px 0 14px}.tp-practice-item{margin:10px 0;padding:15px;border-radius:14px;background:#fff;border:1px solid var(--r3-line)}.tp-practice-item h3{margin:5px 0 10px}.tp-practice-item input,.tp-flow textarea{width:100%;padding:12px;border:1px solid #aecaA6;border-radius:11px;background:#fff}.tp-practice-item details{margin-top:8px;color:var(--r3-muted)}.tp-primary{border:0;border-radius:12px;background:var(--r3-deep);color:#fff;padding:11px 16px;font-weight:850}.tp-flow-feedback{min-height:24px;color:#356d37;font-weight:750}.tp-cue{padding:13px;border-radius:12px;background:#fff4c9}.tp-complete{background:#eaf6e4;text-align:center}
.tp-teacher-inventory{margin:22px 0}.tp-inventory-head{padding:18px;border-radius:16px;background:#eef7e9}.tp-inventory-head>span{font-size:11px;font-weight:900;color:var(--r3-deep);letter-spacing:.08em}.tp-inventory-head h2{margin:5px 0}.tp-inventory-head p{margin:0;color:var(--r3-muted)}.tp-inventory-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:12px}.tp-inventory-grid>article{padding:16px;border:1px solid var(--r3-line);border-radius:15px;background:#fff}.tp-inventory-grid header{display:flex;gap:10px;align-items:center}.tp-inventory-grid h3{margin:3px 0;font-size:16px}.tp-inventory-grid header small{color:var(--r3-muted)}.tp-inventory-grid dl{margin:12px 0 0;display:grid;gap:8px}.tp-inventory-grid dl>div{display:grid;grid-template-columns:130px 1fr;gap:8px;padding-top:8px;border-top:1px solid #edf1eb}.tp-inventory-grid dt{font-weight:850;color:var(--r3-deep)}.tp-inventory-grid dd{margin:0;line-height:1.45}.r3-version-links{display:flex;gap:12px;flex-wrap:wrap}
@media(max-width:900px){.tp-inventory-grid{grid-template-columns:1fr}.tp-inventory-grid dl>div{grid-template-columns:1fr}}
@media(max-width:760px){html,body,#r3Root{max-width:100vw;overflow-x:hidden}body,#r3Root,.r3-app,.r3-work,.r3-layout,.r3-stage-shell,.r3-stage-inner,.r3-task,.tp-segment,.tp-flow{width:100%;max-width:100%;min-width:0}.r3-app{overflow-x:hidden}.r3-side,.r3-lessons{width:100%;min-width:0}.r3-lessons{grid-template-columns:repeat(6,minmax(0,1fr));max-width:100%}.r3-lessons button{min-width:0;padding:0}.r3-top,.r3-top-title,.r3-top-actions,.r3-role,.r3-lang{min-width:0;max-width:100%;overflow-wrap:anywhere}.r3-top-actions,.r3-role,.r3-lang{flex-wrap:wrap}.tp-segment,.tp-flow{overflow-wrap:anywhere}.tp-segment *{min-width:0;max-width:100%}.tp-media-status{grid-template-columns:32px minmax(0,1fr)}.tp-media-status b,.tp-media-status small{white-space:normal;word-break:break-word}.tp-flow-progress{gap:4px}.tp-inventory-grid dl>div{grid-template-columns:1fr}}
.tp-video-shell{margin:14px 0}.tp-video-region{position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:16px;background:linear-gradient(145deg,#173f29,#0c2518);color:#fff;box-shadow:0 12px 30px #173f2930}.tp-video-region video{width:100%;height:100%;object-fit:cover}.tp-neutral-poster{height:100%;display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:center;padding:clamp(20px,5vw,48px);background:radial-gradient(circle at 78% 20%,#ffd65a40,transparent 26%),linear-gradient(135deg,#2b7a3d,#163f28)}.tp-poster-mark{width:74px;height:74px;display:grid;place-items:center;border-radius:24px;background:#fff;color:var(--r3-deep);font-size:25px;font-weight:950;box-shadow:0 10px 28px #0003}.tp-neutral-poster small,.tp-neutral-poster strong,.tp-neutral-poster em{display:block}.tp-neutral-poster small{font-weight:900;letter-spacing:.1em;color:#d8efd8}.tp-neutral-poster strong{font-size:clamp(21px,3vw,34px);line-height:1.15;margin:8px 0;max-width:24ch}.tp-neutral-poster em{font-style:normal;color:#ffeaa0}.tp-video-bar,.tp-transcript-head{position:absolute;inset:auto 0 0;display:flex;gap:12px;justify-content:space-between;align-items:center;padding:12px 14px;background:#081b12dd}.tp-video-bar span{font-weight:800}.tp-video-bar button,.tp-transcript-head button{border:1px solid #ffffff55;border-radius:10px;background:#fff;color:var(--r3-forest);padding:8px 12px;font-weight:850}.tp-script-region{background:#fff;color:var(--r3-ink);padding:0 0 58px}.tp-transcript-head{position:absolute;top:0;bottom:auto;background:#eaf5e5;color:var(--r3-deep);z-index:2}.tp-transcript-head span{font-size:11px;letter-spacing:.1em;font-weight:900}.tp-student-transcript{height:100%;overflow:auto;padding:70px 22px 18px}.tp-student-transcript p{line-height:1.65;margin:0 0 14px}
@media(max-width:760px){.tp-neutral-poster{grid-template-columns:1fr;padding:20px}.tp-poster-mark{width:54px;height:54px;border-radius:17px}.tp-video-bar{align-items:flex-start}.tp-video-bar span{font-size:12px}.tp-video-bar button{flex:none}}
.tp-approved-poster{position:relative;width:100%;height:100%;background:#102b1a}.tp-approved-poster img{display:block;width:100%;height:100%;object-fit:contain}.tp-approved-poster>span{position:absolute;left:12px;bottom:58px;padding:7px 10px;border-radius:9px;background:#081b12df;color:#fff;font-size:12px;font-weight:850}
.tp-production-view{margin:22px 0;padding:20px;border:1px solid var(--r3-line);border-radius:18px;background:#fff}.tp-production-view>span{display:block;margin:14px 0 4px;color:var(--r3-deep);font-size:11px;font-weight:900;letter-spacing:.08em}.tp-production-view h2{margin:0 0 14px}.tp-production-meta{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.tp-production-meta p{margin:0;padding:10px;border-radius:10px;background:#f3f7ef;overflow-wrap:anywhere}.tp-production-view details{margin-top:12px;border:1px solid var(--r3-line);border-radius:12px;padding:12px}.tp-production-view summary{cursor:pointer;font-weight:850}.tp-production-view details article{padding:10px 0;border-top:1px solid var(--r3-line)}.tp-production-view details article:first-of-type{margin-top:10px}.tp-theme-preview{aspect-ratio:16/9;display:block;width:100%;height:auto;object-fit:contain;border-radius:13px;background:linear-gradient(135deg,#dcebd7,#fff4c9);color:var(--r3-deep);font-weight:850;margin:12px 0}@media(max-width:760px){.tp-production-meta{grid-template-columns:1fr}}