:root{--ink:#203d3a;--muted:#718580;--green:#19786a;--mint:#e4f1e9;--cream:#fbfaf4;--line:#e2e9df;--orange:#ec9b45;--shadow:0 12px 30px #244c3e0b;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--cream);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button{cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.5}button,a,input{ -webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #eaad3b;outline-offset:4px}button{border:0}a{color:var(--green)}.app-shell{display:grid;grid-template-columns:240px 1fr;min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;padding:32px 24px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:30px}.brand{display:flex;gap:12px;align-items:center;font-weight:850;font-size:19px}.brand-mark{font-size:28px;background:#e3efe5;border-radius:14px;padding:9px}.brand small{display:block;font-size:10px;letter-spacing:2px;color:var(--muted);margin-top:5px}.profile{background:#faf9f2;border:1px solid #eeeadd;border-radius:22px;padding:20px;text-align:center}.avatar{display:block;font-size:48px;line-height:1.3}.profile h3{font-size:17px;margin:10px 0 4px}.profile p{font-size:12px;color:var(--muted);margin:0}.text-button{background:none;color:var(--green);font-size:12px;padding:10px}.nav{display:grid;gap:8px}.nav button{text-align:left;border-radius:12px;padding:15px 16px;background:transparent;display:flex;align-items:center;gap:12px;font-weight:650}.nav button.active{background:#e8f3eb;color:var(--green)}.nav button:hover{background:#f1f5ed}.nav small{font-size:10px;margin-left:auto}.side-bottom{margin-top:auto;font-size:12px;color:var(--muted);line-height:1.8}.leaf-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#72a783;margin-right:6px}.main{max-width:1450px;width:100%;margin:auto;padding:28px 44px 50px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:24px}.eyebrow{font-size:11px;letter-spacing:2px;color:var(--muted);font-weight:700}.topbar h1{font-size:23px;margin:5px 0 0;letter-spacing:-.5px}.top-actions{display:flex;align-items:center;gap:10px}.badge{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);border-radius:100px;padding:9px 13px;font-size:12px;background:#fff;white-space:nowrap}.icon-button{width:42px;height:42px;background:#fff;border:1px solid var(--line);border-radius:14px}.hero{background:#e5f1e9;border-radius:26px;min-height:258px;position:relative;overflow:hidden;display:flex;align-items:center;padding:35px 36px;border:1px solid #d9e9dd}.hero-copy{position:relative;z-index:1;width:53%;max-width:480px}.kicker{display:inline-flex;align-items:center;gap:6px;background:#fff9;border:1px solid #fff;border-radius:100px;padding:6px 11px;font-size:11px;color:var(--green);font-weight:650}.hero h2{font-size:34px;line-height:1.4;letter-spacing:-1px;margin:14px 0 12px;font-weight:850}.hero h2 em{font-style:normal;color:var(--green)}.hero p{font-size:13px;line-height:1.9;color:#607c70;margin:0 0 19px;max-width:370px}.primary{background:var(--green);color:#fff;border-radius:13px;min-height:46px;padding:12px 22px;font-weight:700;box-shadow:0 4px 0 #125d51;transition:transform .15s}.primary:hover{background:#116c5e;transform:translateY(-1px)}.primary:active{transform:translateY(2px);box-shadow:none}.secondary{background:#fff;border:1px solid var(--line);border-radius:13px;min-height:46px;padding:12px 20px;font-weight:600}.hero-art{position:absolute;right:0;bottom:-10px;width:49%;height:285px}.section-heading{display:flex;align-items:center;justify-content:space-between;margin:29px 0 17px;gap:14px}.section-heading h2{font-size:19px;margin:0}.section-heading p{font-size:12px;color:var(--muted);margin:6px 0 0}.segmented{display:flex;background:#edf0e8;border-radius:12px;padding:4px;gap:3px}.segmented button{background:transparent;border-radius:9px;min-height:38px;padding:8px 17px;font-size:12px;font-weight:650;white-space:nowrap}.segmented button.active{background:#fff;color:var(--green);box-shadow:0 2px 6px #203d3a0b}.filters{display:flex;gap:12px;justify-content:space-between;align-items:center;margin-bottom:18px}.legend{display:flex;gap:16px;align-items:center;font-size:11px;color:var(--muted)}.legend i{display:inline-block;width:7px;height:7px;border-radius:50%;background:#217c6e;margin-right:5px}.legend i.progress{background:#e5a448}.legend i.new{background:#cad8cc}.world{position:relative;background:#f0f5eb;border:1px solid #e1e9db;border-radius:25px;padding:27px;overflow:hidden;min-height:390px}.world::before{content:"";position:absolute;inset:0;opacity:.35;background-image:radial-gradient(#b8cdb5 1px,transparent 1px);background-size:22px 22px;pointer-events:none}.world-title{position:relative;display:flex;justify-content:space-between;align-items:center;margin-bottom:23px}.world-title h3{margin:0;font-size:17px}.world-title p{font-size:12px;color:var(--muted);margin:6px 0 0}.world-tag{font-size:11px;background:#fff9;border-radius:20px;padding:7px 10px}.unit-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;position:relative}.unit-card{background:#fffefa;text-align:left;padding:19px;border-radius:18px;border:1px solid #dee8d9;box-shadow:0 5px 0 #dce7d6;min-height:168px;position:relative;transition:transform .2s,border-color .2s}.unit-card:hover{transform:translateY(-4px);border-color:#8ab897}.unit-icon{width:48px;height:48px;border-radius:14px;display:flex;justify-content:center;align-items:center;font-size:26px;margin-bottom:13px;background:var(--card-color,#f0e7ce)}.unit-label{position:absolute;top:20px;right:17px;font-size:10px;color:#718375}.unit-card h4{font-size:14px;margin:0 0 6px;line-height:1.5}.unit-card p{font-size:11px;color:var(--muted);line-height:1.6;margin:0;min-height:18px}.unit-foot{display:flex;justify-content:space-between;align-items:center;margin-top:15px;font-size:10px;color:#7a8b7d}.unit-foot strong{color:var(--green);font-weight:600}.progress-track{height:5px;background:#eef1e8;border-radius:10px;flex:1;max-width:85px;overflow:hidden}.progress-track span{display:block;height:100%;background:#76a88a;border-radius:10px}.lower-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:18px;margin-top:23px}.note-card{border:1px solid 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0}.close{background:#eaf0e6;width:38px;height:38px;border-radius:50%;font-size:23px;flex-shrink:0}.lesson-list{display:grid;gap:12px}.lesson-row{display:flex;gap:14px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:16px;padding:17px;text-align:left;width:100%}.lesson-row .num{background:#e6f1e7;color:var(--green);border-radius:12px;width:40px;height:40px;display:grid;place-items:center;flex-shrink:0}.lesson-row h3{margin:0 0 5px;font-size:15px}.lesson-row p{font-size:12px;margin:0;color:var(--muted)}.lesson-row .state{margin-left:auto;font-size:11px;white-space:nowrap;color:var(--green)}.story{padding:16px 18px;background:#eaf1e5;border-radius:15px;line-height:1.8;font-size:13px;margin:15px 0}.task-head{display:flex;gap:8px;align-items:center;margin-bottom:10px}.pill{font-size:10px;padding:5px 9px;background:#edf1e7;color:#597b65;border-radius:100px}.task-prompt{font-size:20px;line-height:1.65;margin:15px 0 22px;font-weight:700;white-space:pre-line}.options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.option{background:#fff;border:2px solid #e2e9dc;min-height:66px;border-radius:15px;padding:14px;font-size:16px;line-height:1.5;display:flex;align-items:center;gap:12px;text-align:left}.option.selected{background:#e3f2e9;border-color:var(--green)}.option-key{width:27px;height:27px;background:#f0f2ea;border-radius:8px;display:grid;place-items:center;font-size:12px;color:#718875;flex-shrink:0}.number-input{border:2px solid #c8ddce;border-radius:15px;width:min(240px,100%);padding:15px;font-size:26px;background:white;text-align:center}.task-controls{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:25px;flex-wrap:wrap}.hint-button{background:transparent;color:var(--green);padding:12px;font-size:13px;min-height:44px}.feedback{margin-top:18px;padding:17px 19px;border-radius:15px;background:#fff1dc;border:1px solid #eed9b4;line-height:1.8;font-size:14px}.feedback.good{background:#e4f2e6;border-color:#bfdcc6}.hint-box{background:#fff8e7;border:1px dashed #e8ce91;padding:14px 17px;margin:16px 0;border-radius:12px;font-size:14px;line-height:1.8}.task-visual{background:#fff;border:1px solid #e2e9dc;border-radius:18px;padding:20px;margin:15px 0;text-align:center}.task-visual svg{max-width:100%;height:auto}.task-visual p{color:var(--muted);font-size:12px;line-height:1.7}.fraction-grid{display:flex;width:min(360px,100%);margin:20px auto;gap:5px}.fraction-cell{min-width:0;height:90px;flex:1;border:2px solid #c7d8c9;background:#f4f4e8;border-radius:10px;font-size:20px}.fraction-cell.selected{background:#f4c76d;border-color:#d89832}.order-zone{display:flex;flex-wrap:wrap;min-height:70px;gap:8px;padding:12px;background:#edf3e8;border:2px dashed #c4d6bc;border-radius:14px;align-items:center;margin-bottom:13px}.word-chip{padding:12px 17px;background:#fff;border:1px solid #d7e2d0;border-radius:10px;min-height:44px}.word-bank{display:flex;gap:8px;flex-wrap:wrap}.order-zone:empty:before{content:"按顺序点击下方卡片，排好后再检查";color:#7c9077;font-size:13px}.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.match-column{display:grid;gap:10px}.match-item{padding:14px;border:2px solid #dce6d6;border-radius:12px;background:#fff;min-height:55px}.match-item.selected{border-color:var(--green);background:#e6f2e7}.match-item.matched{background:#e0eddf;border-color:#9bc3a3;opacity:.65}.reward{text-align:center;padding:25px 10px}.reward .big{font-size:76px}.reward h2{font-size:25px}.reward p{font-size:14px;color:var(--muted);line-height:1.8;max-width:470px;margin:15px auto}.reward .summary{margin:20px auto;padding:20px;background:#e8f1e4;border-radius:18px;max-width:470px;font-size:14px;line-height:1.9}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0}.stat{background:#fff;border:1px solid var(--line);border-radius:17px;padding:23px}.stat strong{display:block;font-size:31px;color:var(--green);margin-bottom:8px}.stat span{font-size:12px;color:var(--muted)}.panel{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px;margin-top:20px}.panel h3{font-size:16px;margin:0 0 12px}.panel p,.panel li{font-size:13px;line-height:1.9;color:#667c70}.record{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding:15px 0;gap:15px;font-size:13px}.record small{color:var(--muted);display:block;margin-top:5px}.warning{background:#fff7e3;border:1px solid #e7d7af;border-radius:12px;padding:13px 16px;font-size:12px;line-height:1.8;color:#8a6b2c}.choice-grid{display:flex;gap:12px;flex-wrap:wrap;margin:15px 0}.choice-grid button{min-width:70px;min-height:65px;border:2px solid #dde7d6;border-radius:15px;background:white;font-size:26px}.choice-grid button.selected{border-color:var(--green);background:#e5f1e6}.choice-grid.names button{font-size:15px;padding:12px 17px}.setting-label{font-size:13px;font-weight:700;margin-top:20px}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#24483e;color:white;border-radius:14px;padding:13px 22px;z-index:30;font-size:13px;box-shadow:var(--shadow)}.pause-screen{text-align:center;padding:35px}.pause-screen .big{font-size:70px}.pause-screen p{line-height:1.9;color:var(--muted)}.house-controls{display:flex;justify-content:center;gap:10px}.house-controls button{padding:10px 20px;min-height:44px;border-radius:10px;background:#eef2e7}.house-controls button.active{background:#cce5d1}.step-strip{display:flex;gap:7px;margin:4px 0 18px}.step-strip span{height:5px;flex:1;background:#e4e9dc;border-radius:10px}.step-strip span.done{background:#6ba887}.checklist{display:grid;gap:10px}.checklist label{padding:12px;background:#f5f7f0;border-radius:10px;font-size:13px;display:flex;gap:10px;align-items:center}.muted{color:var(--muted)}.book-stack{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}.book-box{background:#e9eddb;border:2px solid #c1d4ad;border-radius:12px;padding:12px;font-size:24px;min-width:80px}.book-box.active{background:#f2d393;border-color:#dbaa54}.small-help{font-size:11px;color:var(--muted);line-height:1.8}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(min-width:1500px){.main{padding:35px 60px}.unit-grid{gap:20px}.hero{min-height:285px}}@media(max-width:1100px){.app-shell{grid-template-columns:195px 1fr}.sidebar{padding:25px 17px}.brand{font-size:16px;gap:8px}.brand-mark{font-size:23px;padding:7px}.main{padding:25px}.hero{padding:28px}.hero h2{font-size:28px}.unit-grid{gap:12px}.unit-card{padding:16px}.unit-label{font-size:9px;right:13px}.hero-art{width:47%}}@media(max-width:800px){.app-shell{display:block}.sidebar{height:auto;position:static;padding:14px 20px;display:flex;flex-direction:row;justify-content:space-between;align-items:center;border-right:0;border-bottom:1px solid var(--line);gap:12px}.sidebar .profile,.side-bottom{display:none}.brand small{font-size:8px}.brand{font-size:15px}.brand-mark{font-size:23px}.nav{display:flex;gap:3px}.nav button{font-size:12px;padding:10px;gap:5px}.nav button small{display:none}.main{padding:22px}.topbar h1{font-size:21px}.hero{min-height:255px}.unit-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.unit-card h4{font-size:13px}.unit-label{position:static;display:block;margin-bottom:6px}.unit-foot .progress-track{max-width:50px}.footer{line-height:1.8}.hero-copy{width:58%}.hero-art{width:43%;right:-10px}.legend{gap:9px}}@media(max-width:600px){.sidebar{padding:12px 15px}.brand{font-size:13px}.brand small{letter-spacing:1px}.brand-mark{font-size:20px;padding:6px}.nav button{font-size:18px;padding:8px}.nav .nav-text{display:none}.main{padding:20px 16px 35px}.topbar{margin-bottom:17px}.eyebrow{font-size:9px}.topbar h1{font-size:20px}.badge{font-size:10px;padding:8px 10px}.hero{padding:25px 23px;min-height:365px;align-items:flex-start}.hero-copy{width:100%;max-width:none}.hero h2{font-size:29px;margin:13px 0 10px;max-width:280px}.hero p{max-width:220px;font-size:12px}.hero-art{width:57%;height:175px;bottom:-6px;right:-8px}.hero .primary{position:relative;z-index:2;font-size:13px;padding:11px 17px;margin-top:5px}.hero .kicker{font-size:10px}.section-heading{align-items:flex-start;margin-top:25px;flex-wrap:wrap}.section-heading h2{font-size:18px}.segmented button{padding:8px 14px}.filters{flex-wrap:wrap;gap:13px}.legend{font-size:10px}.world{padding:17px 13px;border-radius:20px}.world-title h3{font-size:15px}.world-title p{font-size:10px}.world-tag{font-size:10px}.unit-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px 10px}.unit-card{padding:15px 13px;min-height:174px}.unit-card h4{font-size:13px}.unit-icon{height:42px;width:42px;font-size:23px;margin-bottom:10px}.unit-card p{font-size:10px}.unit-label{font-size:9px}.unit-foot{font-size:9px;gap:5px}.lower-grid{grid-template-columns:1fr;gap:12px}.note-card{padding:18px}.footer{display:block;font-size:9px}.footer span{display:block;margin-top:5px}.modal-backdrop{padding:10px}.modal{padding:20px 17px;border-radius:21px;max-height:calc(100dvh - 20px)}.task-prompt{font-size:18px}.options{grid-template-columns:1fr}.option{min-height:58px;font-size:15px}.modal-header h2{font-size:18px}.task-controls .primary{flex:1}.task-controls .secondary{flex:1}.stats-grid{gap:8px}.stat{padding:16px 12px}.stat strong{font-size:25px}.stat span{font-size:10px}.panel{padding:18px}.record{font-size:12px}.lesson-row{padding:14px 11px;gap:10px}.lesson-row h3{font-size:13px}.lesson-row p{font-size:11px}.lesson-row .state{font-size:10px}.lesson-row .num{width:33px;height:33px}.task-visual{padding:14px}.fraction-cell{height:75px}.match-item{font-size:13px;padding:12px 8px}.top-actions{gap:6px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
/* Readable curriculum summaries and minimum touch targets. */
.unit-card p{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:35px}.text-button{min-height:44px}.unit-card:focus-visible{outline-offset:5px}.unit-label{max-width:calc(100% - 82px);text-align:right}.task-prompt{overflow-wrap:anywhere}.option,.word-chip,.match-item{overflow-wrap:anywhere}.modal .panel{background:#fdfdf8}.hero-art{pointer-events:none}
.coverage-details{font-size:12px;color:#627c69;line-height:1.9;margin:12px 0;border:1px solid #e1e9d9;border-radius:12px;padding:11px 14px;background:#fffdf7}.coverage-details summary{cursor:pointer;min-height:28px;font-weight:650;color:#416b53}.coverage-details ul{padding-left:20px}.coverage-details p{margin:8px 0}.reflection{background:#fff8e8;border:1px solid #eddcb8;border-radius:15px;padding:17px;max-width:500px;margin:18px auto;font-size:13px;text-align:left}.reflection p{margin:10px 0;font-size:13px}.checklist input{width:19px;height:19px;accent-color:var(--green);flex-shrink:0}
/* v0.9: child-first reading sizes, including tablets and narrow phones. */
.unit-card h4{font-size:17px;line-height:1.6}.unit-card p{font-size:14px;line-height:1.75;min-height:49px}.unit-foot{font-size:13px;flex-wrap:wrap;gap:7px}.unit-label{font-size:12px}.unit-card{min-height:223px}.unit-foot .progress-track{max-width:62px}.segmented button{font-size:15px;min-height:44px}.legend{font-size:13px;flex-wrap:wrap}.world-title p{font-size:14px}.world-tag{font-size:12px}.profile p{font-size:13px}.hero p{font-size:15px}.note-card p{font-size:14px}.note-card h3{font-size:16px}.lesson-row h3{font-size:17px}.lesson-row p{font-size:14px}.lesson-row .state{font-size:13px}.story{font-size:16px}.task-prompt{font-size:22px}.task-head .pill{font-size:12px}.task-visual p,.small-help{font-size:13px}.hint-button{font-size:15px}.word-chip,.match-item{font-size:17px}.feedback,.hint-box{font-size:16px}.task-controls button{font-size:16px}.coverage-details{font-size:14px}.section-heading p{font-size:14px}.nav button{font-size:15px}.task-visual .book-box small{font-size:14px}.badge{font-size:13px}
@media(max-width:1100px){.unit-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero h2{font-size:29px}.hero-copy{width:60%}.hero-art{width:42%}.unit-label{position:static;display:block;text-align:left;max-width:100%;margin-bottom:10px}}
@media(max-width:800px){.nav button{font-size:14px}.main{padding:23px}.unit-grid{gap:17px}.hero{min-height:280px}.hero p{font-size:14px}.section-heading{flex-wrap:wrap}.filters{flex-wrap:wrap}.lesson-row{align-items:flex-start}.lesson-row .state{white-space:normal;min-width:70px;text-align:right}}
@media(max-width:600px){.main{padding:20px 16px 35px}.nav button{font-size:19px;min-width:44px;min-height:44px}.hero{min-height:385px}.hero-copy{width:100%}.hero-art{width:58%}.hero h2{font-size:29px}.hero p{font-size:15px;max-width:240px}.hero .primary{font-size:16px}.unit-card h4{font-size:17px}.unit-card p{font-size:14px}.unit-foot{font-size:13px}.unit-label{font-size:12px}.world-title h3{font-size:17px}.world-title p{font-size:13px;max-width:220px}.world-tag{font-size:12px}.world-title{gap:12px;align-items:flex-start}.legend{font-size:13px}.segmented button{font-size:15px}.task-prompt{font-size:20px}.option{font-size:17px;min-height:63px}.lesson-row h3{font-size:17px}.lesson-row p{font-size:14px}.lesson-row .state{font-size:13px}.badge{font-size:12px}.top-actions .badge{display:none}.note-card p{font-size:14px}.unit-icon{width:48px;height:48px;font-size:27px}.unit-card{padding:18px;min-height:235px}.unit-foot .progress-track{max-width:55px}.section-heading p{font-size:14px}.task-controls{gap:12px}.hint-button{min-height:46px}.text-button{font-size:13px}.story{line-height:1.85}.modal-header h2{font-size:20px}.modal{padding:23px 18px}}
@media(max-width:430px){.unit-grid{grid-template-columns:1fr}.unit-card{min-height:0;padding:21px 20px 19px 90px}.unit-icon{position:absolute;left:20px;top:23px}.unit-label{margin-bottom:5px}.unit-card p{min-height:0;-webkit-line-clamp:2}.unit-foot .progress-track{max-width:78px}.unit-card h4{font-size:18px}.world-tag{display:none}.world-title p{max-width:none}.lesson-row{flex-wrap:wrap}.lesson-row .state{margin-left:46px;text-align:left}.hero-art{width:60%;bottom:-2px}.brand{font-size:14px}.brand small{display:none}.modal-backdrop{padding:7px}.modal{max-height:calc(100dvh - 14px)}.task-controls .hint-button{width:100%;text-align:left}.task-controls .secondary,.task-controls .primary{font-size:15px;padding:12px 14px}.stats-grid{grid-template-columns:1fr}.stat{display:flex;align-items:center;gap:18px;padding:17px}.stat strong{margin:0;font-size:28px}.stat span{font-size:14px}}
.camp-section{margin-top:28px}.camp-scene{position:relative;height:350px;border:1px solid #dce8d6;background:#edf5e5;border-radius:24px;overflow:hidden}.camp-bg{position:absolute;inset:0;width:100%;height:100%}.camp-place{position:absolute;transform:translate(-50%,-50%);display:flex;flex-direction:column;align-items:center;background:transparent;padding:6px;min-width:112px;z-index:2}.camp-building{position:relative;display:grid;place-items:center;width:57px;height:57px;background:#fff9ee;border:2px solid #d9dcc7;border-radius:18px;font-size:34px;box-shadow:0 5px 0 #c9d6b9;filter:saturate(.55)}.camp-place.restored .camp-building{background:#fff8d5;border-color:#dfbb6d;filter:none;box-shadow:0 5px 0 #c5a767}.camp-building i{position:absolute;right:-5px;top:-6px;border:2px solid white;background:#4f9672;color:white;width:23px;height:23px;border-radius:50%;font-size:12px;font-style:normal;display:grid;place-items:center}.camp-place strong{font-size:14px;background:#fffdf0e8;padding:4px 8px;border-radius:7px;margin-top:8px}.camp-place small{font-size:11px;color:#54765a;margin-top:4px;background:#edf4dfc9;padding:2px 6px;border-radius:5px}.camp-place:hover .camp-building{transform:translateY(-3px)}.camp-place.here .camp-building{outline:3px solid #539372;outline-offset:3px}.camp-hero{position:absolute;z-index:3;transform:translate(-50%,-50%);margin-top:-72px;pointer-events:none;transition:left .45s ease,top .45s ease;display:flex;align-items:flex-end;filter:drop-shadow(0 3px 2px #718d6c55)}.camp-hero span{font-size:36px}.camp-hero small{font-size:23px}.camp-caption{font-size:14px;color:#53715a;line-height:1.8;margin:12px 5px}.camp-caption>span{font-size:11px;color:#8b9885;display:block;margin-top:2px}.world-change{background:#e7f0da;border:1px solid #c6d9b4;border-radius:18px;max-width:440px;margin:0 auto 20px;padding:20px;animation:arrival .45s ease-out}.world-change>span{font-size:52px;display:block}.world-change strong{font-size:21px;display:block;margin-top:8px}.world-change p{font-size:14px!important;margin:7px 0!important}@keyframes arrival{from{transform:scale(.94);opacity:.2}to{transform:scale(1);opacity:1}}@media(max-width:900px){.camp-scene{height:360px}.camp-place{min-width:95px}.camp-place strong{font-size:13px}.camp-place small{font-size:10px}.camp-building{width:50px;height:50px;font-size:30px}.camp-hero{margin-top:-66px}.camp-hero span{font-size:31px}.camp-hero small{font-size:20px}}@media(max-width:600px){.camp-scene{height:430px}.camp-place{min-width:100px}.camp-place strong{font-size:14px;padding:4px 5px}.camp-place small{display:none}.camp-place[data-camp="special-view"]{left:19%!important;top:30%!important}.camp-place[data-camp="special-mixed"]{left:50%!important;top:22%!important}.camp-place[data-camp="special-ruler"]{left:80%!important;top:38%!important}.camp-place[data-camp="special-multiply"]{left:81%!important;top:68%!important}.camp-place[data-camp="special-fraction"]{left:49%!important;top:79%!important}.camp-place[data-camp="special-angle"]{left:18%!important;top:66%!important}.camp-building{width:57px;height:57px;font-size:34px}.camp-hero{display:none}.camp-place.here::before{content:'你在这里';position:absolute;top:-22px;font-size:12px;color:#347253;background:#fffef0;border-radius:20px;padding:3px 8px}.camp-caption{font-size:14px}.camp-section .section-heading{gap:12px}.camp-section .badge{font-size:13px}}
.camp-mini-avatar{display:none}.unit-icon{position:relative}.region-leaf{position:absolute;right:-8px;bottom:-6px;font-size:20px;font-style:normal}.region-awake{background:#fcfff7}.region-complete{border-color:#a3c18f;background:#f7fbe9}.region-change{font-size:12px;display:block;margin-top:10px;color:#54804e}.camp-place.here .camp-building{animation:arrival .3s ease-out}@media(max-width:600px){.camp-mini-avatar{display:block;position:absolute;top:-32px;font-size:24px;font-weight:400;white-space:nowrap;line-height:30px}.camp-place.here::before{display:none}}
/* Contrast audit: normal reading text >= 4.5:1 on its light background. */
:root{--muted:#5c7068}.footer{color:#66786b}.unit-label,.unit-foot{color:#60745f}.legend{color:#5c7068}.small-help{color:#5c7068}.camp-caption>span{color:#63755c}.camp-place small{color:#46633f}.eyebrow{color:#5c7068}.unit-card p,.note-card p,.profile p{color:#5c7068}.pill{color:#46663f}.option-key{color:#526b4e}.word-bank:empty{display:none}summary:focus-visible{outline:3px solid #daab42;outline-offset:3px;border-radius:4px}
@media(max-width:600px){.camp-scene{height:445px}.camp-place[data-camp="special-view"]{left:25%!important;top:22%!important}.camp-place[data-camp="special-mixed"]{left:75%!important;top:22%!important}.camp-place[data-camp="special-ruler"]{left:25%!important;top:51%!important}.camp-place[data-camp="special-multiply"]{left:75%!important;top:51%!important}.camp-place[data-camp="special-fraction"]{left:25%!important;top:81%!important}.camp-place[data-camp="special-angle"]{left:75%!important;top:81%!important}.camp-bg{opacity:.7}}
.learn-start{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border:1px solid #d2e3c9;background:#f1f7e9;border-radius:15px;margin:17px 0}.learn-start>span{font-size:14px;color:#476b41;line-height:1.7}.learn-start button{font-size:15px;white-space:nowrap;border-color:#b6d2ad}.learn-panel{border:1px solid #d5dfbf;background:#fffbed;border-radius:17px;padding:19px 20px;margin:16px 0}.learn-panel>strong{font-size:16px;color:#466b3d}.learn-panel>p{font-size:17px;line-height:1.85;margin:13px 0}.learn-panel>p.small-help{font-size:13px;color:#65744f}.learn-panel button{font-size:15px}@media(max-width:430px){.learn-start{flex-direction:column;align-items:stretch}.learn-start>span{font-size:15px}.learn-panel{padding:17px}.learn-panel>p{font-size:17px}}
/* Landmark geometry leaves a >=25px safety area for labels and hero badges. */
.camp-scene{height:390px}.camp-place{line-height:1.3}.camp-place strong{font-size:16px;line-height:1.4}.camp-place small{font-size:13px;line-height:1.4}.camp-place[data-camp="special-fraction"],.camp-place[data-camp="special-angle"]{top:74%!important}.camp-hero{margin-top:-77px}@media(max-width:600px){.camp-scene{height:465px}.camp-place strong{font-size:16px}.camp-place[data-camp="special-fraction"],.camp-place[data-camp="special-angle"]{top:80%!important}.camp-mini-avatar{top:-34px}.camp-place{min-width:112px}}
/* Concept observation v2: position overview and eye photo stay distinct. */
.obs-lesson{margin-top:18px}.obs-step-line{display:flex;justify-content:space-between;color:#426f55;font-size:14px;font-weight:700}.obs-title{font-size:24px;margin:13px 0 8px;line-height:1.5}.obs-instruction{font-size:18px;line-height:1.8;margin:7px 0 17px}.obs-two-views{display:grid;grid-template-columns:1.45fr 1fr;gap:15px;align-items:stretch}.obs-panel{border:2px solid #d8e5cf;background:#fffdf5;border-radius:20px;padding:15px;min-width:0}.obs-panel h4{font-size:16px;margin:0 0 13px;color:#3d6550}.obs-overview{width:100%;height:auto;display:block;overflow:visible}.obs-photo{display:block;width:100%;height:auto;max-height:230px;margin:auto}.obs-camera{display:flex;flex-direction:column;background:#f2f6ec}.obs-camera>.obs-photo{max-width:210px;flex:1}.obs-camera-hidden{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:205px;flex:1;text-align:center;border:2px dashed #c6d8bf;border-radius:15px;background:#e6eedf;padding:18px}.obs-camera-hidden>span{font-size:42px}.obs-camera-hidden strong{font-size:20px;margin:10px 0 5px}.obs-camera-hidden p{font-size:14px;line-height:1.75;max-width:180px;color:#56704f}.obs-station-controls{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:10px}.obs-station-controls button{background:#fff;border:2px solid #c4d7bb;border-radius:12px;min-height:48px;padding:10px 12px;font-size:15px}.obs-station-controls button.selected{border-color:#277856;background:#e0edce}.obs-station-controls span{font-size:13px;color:#5b7153;line-height:1.7}.obs-station[role=button]{cursor:pointer;outline:none}.obs-station[role=button]:focus-visible circle{stroke:#c88620;stroke-width:6}.obs-options{display:flex;gap:14px;justify-content:center;margin:22px 0}.obs-photo-choice{position:relative;flex:1;max-width:210px;border:3px solid #d4dfcb;border-radius:17px;background:#fff;padding:12px;min-height:110px}.obs-photo-choice.selected{border-color:#2d815f;background:#eaf3df}.obs-photo-choice>.obs-photo{max-height:135px}.obs-photo-choice>span{font-size:16px;font-weight:600;display:block;margin-top:6px}.obs-my-choice{display:block;font-size:13px;color:#386e4f;margin-bottom:9px}.obs-feedback{border:1px solid #d8d6aa;border-radius:15px;background:#fff6df;padding:17px 20px;font-size:16px;line-height:1.8;margin:18px 0}.obs-feedback.good{background:#e7f0dc;border-color:#bad3a9}.obs-feedback p{margin:7px 0 0}.obs-help-note{border-left:4px solid #d4ac58;padding:10px 14px;background:#fff6dd;font-size:16px;line-height:1.8}.obs-actions{display:flex;justify-content:flex-end;align-items:center;gap:14px;margin:22px 0 13px;flex-wrap:wrap}.obs-actions .primary{font-size:17px;min-height:50px}.obs-small{font-size:13px;line-height:1.8;color:#5c7156}.obs-parent-note{font-size:13px;line-height:1.8;color:#61705b;border-top:1px solid #d9e3d0;padding-top:11px}.obs-parent-note summary{cursor:pointer;min-height:35px}.obs-comparison{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:auto}.obs-comparison>div{background:#fff;border:1px solid #cfddc2;border-radius:11px;padding:9px 5px;text-align:center}.obs-comparison strong{font-size:13px;line-height:1.6;display:block;margin-bottom:8px}.obs-voice{background:#e7efe4;border:1px solid #d3e1cb;border-radius:17px;padding:14px 17px}.obs-voice-controls{display:flex;gap:6px 12px;align-items:center;flex-wrap:wrap}.obs-voice-controls button{font-size:14px;min-height:42px}.obs-voice-controls label{font-size:13px;color:#526a4d;display:flex;align-items:center;gap:5px}.obs-voice select{font:inherit;color:#35583d;padding:7px;border:1px solid #a9c59f;border-radius:9px;background:white;min-height:38px}.obs-subtitle{font-size:16px;line-height:1.8;margin:12px 0 4px;color:#355a3f}.obs-speech-status{font-size:12px;line-height:1.6;color:#5c7054;margin:4px 0}.obs-fixed-object{transform:none!important}@media(max-width:650px){.obs-two-views{grid-template-columns:1fr}.obs-panel{padding:14px}.obs-overview{max-height:260px}.obs-camera{display:grid;grid-template-columns:1fr 150px;align-items:center;gap:10px}.obs-camera h4{line-height:1.7;margin:0}.obs-camera>.obs-photo{height:155px;width:145px;grid-column:2;grid-row:1/3}.obs-camera-hidden{min-height:140px;padding:12px;grid-column:2;grid-row:1/3}.obs-camera-hidden>span{font-size:30px}.obs-camera-hidden strong{font-size:17px;margin-top:5px}.obs-camera-hidden p{font-size:13px;margin-bottom:0}.obs-title{font-size:22px}.obs-instruction{font-size:17px}.obs-options{gap:12px}.obs-photo-choice>.obs-photo{max-height:120px}.obs-photo-choice{padding:10px}.obs-comparison{grid-column:1/-1;max-width:330px;width:100%}.obs-comparison .obs-photo{max-height:145px}.obs-actions .primary{flex:1}.obs-voice-controls .secondary{flex:1}.obs-voice-controls label{margin-left:auto}}@media(prefers-reduced-motion:reduce){.obs-person animateMotion{display:none}}
.obs-hidden{display:none}.obs-recap>p{font-size:18px}.obs-recap-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.obs-recap-grid>section{background:#f3f7ed;border:2px solid #d8e5cd;border-radius:18px;padding:12px}.obs-recap-grid h4{font-size:18px;margin:0}.obs-recap-photo{display:flex;align-items:center;justify-content:center;gap:8px;font-size:16px}.obs-recap-photo .obs-photo{height:110px;width:105px}@media(max-width:500px){.obs-recap-grid{gap:8px}.obs-recap-grid>section{padding:8px}.obs-recap-grid h4{font-size:16px}.obs-recap-photo{flex-direction:column}.obs-recap-photo .obs-photo{height:90px;width:85px}}
.obs-comparison{width:100%;max-width:330px;grid-template-columns:repeat(2,minmax(0,1fr))}.obs-comparison>div{min-width:0}
.obs-photo-choice{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;gap:8px;height:auto;min-width:0}.obs-photo-choice .obs-photo{display:block;flex-shrink:0;width:100%;height:150px}.obs-photo-choice>span,.obs-photo-choice>b{display:block;position:static;white-space:normal;line-height:1.4}.obs-options{margin-bottom:22px}.obs-actions{clear:both}@media(max-width:650px){.obs-photo-choice .obs-photo{height:110px}.obs-photo-choice{padding:10px 8px}}
.obs-comparison strong{font-size:16px}
/* Annual concept learning: explicit thinking steps, no speed or reward pressure. */
.concept-stage-track{display:flex;gap:6px;flex-wrap:wrap;margin:18px 0}.concept-stage-track span{border:1px solid #d7e2cd;border-radius:9px;padding:8px;font-size:14px;color:#657568}.concept-stage-track .active{background:#19786a;color:white}.concept-stage-track .done{background:#edf2e5}.concept-intro h3,.concept-demo h3{font-size:27px;line-height:1.4}.concept-goal{font-size:18px}.concept-explanation,.concept-frame-text{font-size:21px;line-height:1.8;white-space:pre-wrap;margin:18px 0}.concept-key{border-left:5px solid #d8ae64;background:#faf0d8;padding:18px;font-size:20px;line-height:1.6;margin:20px 0}.concept-frame-visual{background:#f4f7ec;border:1px solid #dce7cd;border-radius:18px;padding:15px;overflow:auto}.concept-frame-visual:empty{display:none}.concept-svg{display:block;width:100%;max-width:600px;max-height:400px;margin:auto}.concept-table-wrap{overflow-x:auto}.concept-table{width:100%;border-collapse:collapse;font-size:18px}.concept-table th,.concept-table td{border:1px solid #aabda3;padding:12px;text-align:center}.concept-table th{background:#e0ecd6}.concept-text-lines{font-size:20px;line-height:1.9;white-space:pre-wrap}.concept-text-lines .emphasis{background:#fff0b9;border-left:5px solid #cb9e51;padding:12px}.concept-tokens{display:flex;gap:9px;flex-wrap:wrap}.concept-tokens button{font-size:19px;line-height:1.6;background:white;border:2px solid #d4dfca;border-radius:12px;padding:12px;min-height:48px}.concept-tokens .revealed{background:#fff0bd;border-color:#d0a65e}.concept-tokens span{display:block;font-size:15px;color:#697747}.concept-manipulate{padding:18px;background:#eef4e7;border-radius:15px;margin-top:18px;font-size:18px}.concept-manipulate label{display:block;margin:14px 0}.concept-manipulate input[type=range]{display:block;width:100%;height:44px;accent-color:#19786a}.concept-intro .primary{margin-top:14px}@media(max-width:650px){.concept-intro h3,.concept-demo h3{font-size:23px}.concept-explanation,.concept-frame-text{font-size:19px}.concept-stage-track span{font-size:13px;padding:6px}.concept-frame-visual{padding:8px}.concept-table{font-size:16px}.concept-table th,.concept-table td{padding:8px}.concept-key{font-size:18px}}
.concept-context{padding:16px 18px;border:2px solid #dce5cf;border-radius:16px;background:#f7faef;font-size:19px;line-height:1.7;white-space:pre-wrap}.concept-context>strong{font-size:16px;color:#557b61}.concept-context .concept-svg{max-height:250px}
.option-visual{display:block;flex:1 0 100%;width:100%;margin-top:8px}.option-visual .concept-svg{max-height:220px}.option:has(.option-visual){flex-wrap:wrap}
.lesson-row small{display:block;font-size:14px;line-height:1.6;color:#647b70;margin-top:5px}.checklist input{min-width:22px;min-height:22px;accent-color:#19786a}.checklist label{min-height:44px}
.option-copy{display:block;flex:1;min-width:0;white-space:normal;overflow-wrap:anywhere;word-break:normal}.obs-voice-controls label{white-space:nowrap}.obs-voice-controls select{min-width:90px}
@media(max-width:650px){.obs-voice-controls{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:6px}.obs-voice-controls [data-speech-action="enable"]{grid-column:1/-1}.obs-voice-controls label{grid-column:1/-1;justify-content:flex-end;margin:0}.obs-voice-controls select{width:auto;max-width:130px}.obs-voice-controls .text-button{padding:8px}.obs-voice{padding:14px}.obs-subtitle{margin:10px 0}}
@media(max-width:650px){.obs-voice-controls [data-speech-action="enable"]{grid-row:1;grid-column:1/3}.obs-voice-controls [data-speech-action="pause"]{grid-row:2;grid-column:1}.obs-voice-controls [data-speech-action="mute"]{grid-row:2;grid-column:2}.obs-voice-controls label{grid-row:3;grid-column:1/3}}
/* Normal-flow answer copy keeps multiline touch cards tall enough on narrow screens. */
.option{display:block;position:relative;height:auto;min-height:64px;padding:16px 18px 16px 58px}.option-key{position:absolute;left:14px;top:18px}.option-copy{display:block;line-height:1.6}.option-visual{margin-top:12px}