@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700&family=Noto+Serif:wght@500;600;700&display=swap');
.answer-choice{display:block;text-align:left;font-size:14px;width:100%;margin:10px 0;line-height:1.8;padding:14px}
.role-cards{display:grid;gap:12px;margin:12px 0 22px}.role-cards article{border:1px solid #d8c8a9;background:#fffaf0;border-radius:8px;padding:15px}.role-cards article>b{color:#8d442b;font-family:'Noto Serif',serif;font-size:20px}.role-cards small{font-size:13px;color:#68705d;display:block;margin-top:9px}.branch-buttons{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.branch-buttons button{font-size:14px;flex:1;min-width:145px;line-height:1.7}.branch-buttons .active{background:#164d43;color:white}.branch-detail{background:#edf4ee;border-left:3px solid #507e61;padding:17px;margin-bottom:24px}.strategy-recognize{border-bottom:1px solid #dce3df;padding-bottom:15px}.strategy-source{font-size:12px;color:#697975;margin-top:24px}.strategy-source a{color:#164d43}#strategyFeedback{color:#164d43;font-weight:500}.header-note{display:none}@media(max-width:620px){nav{flex-wrap:wrap}nav button{flex-basis:45%}}
:root{--ink:#182d2b;--muted:#697975;--green:#164d43;--red:#b33b32;--line:#dce3df;--bg:#f5f7f4}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 'Be Vietnam Pro',sans-serif}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;color:inherit;background:white;border:1px solid var(--line);border-radius:7px;padding:9px 15px}button:hover{border-color:var(--green);background:#edf3ef}button:focus-visible,a:focus-visible{outline:3px solid #d39736;outline-offset:3px}button:disabled{opacity:.35;cursor:default}header{height:94px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 5%;gap:20px}.brand{display:flex;gap:13px;align-items:center;text-decoration:none;color:var(--ink);font-weight:700;font-size:21px;letter-spacing:2px}.brand small{display:block;font-size:10px;letter-spacing:2px;color:var(--muted)}.seal{background:var(--green);color:#fff;display:grid;place-items:center;width:46px;height:48px;font:30px serif;border-radius:5px}nav{display:flex;gap:8px}nav button{border:0;background:transparent;padding:11px 20px;color:var(--muted)}nav button.active{background:#eaf1ec;color:var(--green);font-weight:600}.header-note{font-size:14px;color:var(--muted)}main{max-width:1510px;margin:auto;padding:35px 5% 0}.heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:29px}.eyebrow{font-size:12px;font-weight:600;letter-spacing:1.7px;color:var(--green)}h1{font-family:'Noto Serif',serif;font-size:34px;line-height:1.4;margin:9px 0}p{margin:8px 0}.heading p{color:var(--muted);font-size:15px}.chapter-mark{font:74px serif;color:#bccbc2;padding-right:17px}.workspace{display:grid;grid-template-columns:220px minmax(320px,1.25fr) minmax(290px,1fr);gap:22px;align-items:start}.aside-title{font-size:12px;letter-spacing:1px;font-weight:600;display:flex;justify-content:space-between;margin:12px 0 18px}.aside-title span:last-child{color:var(--muted)}.lesson-card{width:100%;background:transparent;border:1px solid transparent;border-bottom-color:var(--line);border-radius:0;text-align:left;padding:16px 12px;display:block;margin-bottom:7px}.lesson-card.active{border:1px solid #b8cec2;border-radius:8px;background:#e9f0e9}.lesson-card small{display:block;color:var(--muted);font-size:12px;margin-bottom:6px}.lesson-card strong{font-size:15px;font-weight:600;display:block}.lesson-card em{font-style:normal;font-size:12px;display:block;color:var(--green);margin-top:6px}.principle{margin:32px 10px 0;border-left:2px solid #b8cbbd;padding-left:15px}.principle p{font-size:14px;color:var(--muted)}.board-panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;box-shadow:0 8px 30px #183d2805}.board-top,.board-bottom{display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:12px}.board-top button{font-size:12px;padding:5px 8px;border:0}.tag{color:var(--green);letter-spacing:.8px;font-size:11px;font-weight:600}.board-wrap{margin:12px 0;border-radius:8px;background:#f2dfbb;border:1px solid #d2b78c;overflow:hidden}#board{width:100%;display:block;touch-action:manipulation}.board-bottom{color:var(--muted);font-size:12px}.red-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--red);margin-right:4px}.controls{display:flex;justify-content:center;gap:12px;margin-top:15px}.controls button:first-child,.controls button:last-child{font-size:22px;width:44px;padding:1px}.controls #play{background:var(--green);color:white;border-color:var(--green);font-size:14px;min-width:165px}.detail-panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:25px}.detail-panel h2{font:600 25px/1.5 'Noto Serif',serif;margin:9px 0}.intro{font-size:14px;color:var(--muted);margin-bottom:22px}.tabs{display:flex;gap:24px;border-bottom:1px solid var(--line);margin-bottom:21px}.tabs button{border:0;border-bottom:2px solid transparent;border-radius:0;padding:8px 0;background:none;font-size:14px}.tabs button.active{color:var(--green);border-color:var(--green);font-weight:600}.insight{background:#eef4ef;border-radius:7px;padding:17px;margin-bottom:20px}.insight span{color:var(--green);font-size:11px;letter-spacing:1px;font-weight:600}.insight h3{font-size:16px;margin:7px 0}.insight p,#bodyContent{font-size:14px;line-height:1.85;color:#54655e}#bodyContent h3{font-size:14px;color:var(--ink);margin:16px 0 5px}#bodyContent ul{padding-left:20px;margin-top:4px}#bodyContent li{margin:6px 0}.next-lesson{margin-top:24px;border-top:1px solid var(--line);padding-top:18px}.next-lesson span{font-size:11px;letter-spacing:1px;color:var(--muted)}.next-lesson p{font-size:13px;color:var(--muted)}#moves button{display:block;width:100%;text-align:left;font-size:14px;margin:7px 0}#moves button.active{background:#edf3ed;border-color:#aac4b4}#exerciseActions{display:flex;gap:8px}#exerciseActions[hidden]{display:none}.primary{background:var(--green);color:white}#feedback{font-size:14px;color:var(--green)}.learning-path{margin:40px 0 30px;border-top:1px solid var(--line);padding-top:25px}.learning-path>div{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;margin-top:17px}.learning-path article{position:relative;padding-left:46px}.learning-path b{position:absolute;left:0;color:#8ba296;font:25px 'Noto Serif',serif}.learning-path h3{font-size:15px;margin:0}.learning-path p{color:var(--muted);font-size:13px}footer{padding:22px 0;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:12px 25px;justify-content:space-between;font-size:11px;color:var(--muted)}footer a{color:var(--green)}footer>span:last-child{width:100%}.square-hit{cursor:pointer}.piece{cursor:pointer}.piece:focus{outline:none}.piece:focus circle{stroke:#d58f26;stroke-width:4}@media(min-width:1500px){.workspace{grid-template-columns:230px 530px 1fr}}@media(max-width:1150px){header{padding:0 3%}.header-note{display:none}main{padding:28px 3% 0}.workspace{grid-template-columns:180px minmax(290px,1fr) minmax(270px,1fr);gap:14px}.detail-panel{padding:19px}.board-panel{padding:13px}h1{font-size:29px}}@media(max-width:900px){.workspace{grid-template-columns:1fr 1fr}aside{grid-column:1/-1}.aside-title,.principle{display:none}#lessonList{display:flex;gap:8px;overflow:auto}.lesson-card{min-width:190px;flex:1;margin:0}.heading{margin-bottom:18px}.chapter-mark{display:none}.lesson-card em{display:none}}@media(max-width:620px){header{height:auto;padding:16px 5%;flex-wrap:wrap}.brand{font-size:18px}.seal{width:38px;height:40px}nav{width:100%;justify-content:space-between;gap:3px}nav button{flex:1;padding:8px 12px}main{padding:25px 4% 0}h1{font-size:26px}.heading p{font-size:14px}.workspace{grid-template-columns:1fr;gap:16px}.board-panel{padding:14px}.detail-panel{padding:22px}.learning-path>div{grid-template-columns:1fr;gap:20px}.eyebrow{font-size:11px}.lesson-card{min-width:180px}footer{font-size:12px}}

.deep-summary{padding:17px;background:#f5eee0;border:1px solid #d5bc8e;border-radius:8px;margin-bottom:23px}.deep-summary>b{font-size:12px;letter-spacing:1px;color:#8d442b}.deep-summary small{display:block;font-size:12px;line-height:1.8;color:#746a56}.checkpoint-buttons{display:flex;gap:6px;flex-wrap:wrap;margin:12px 0}.checkpoint-buttons button{font-size:12px;padding:6px 10px}.checkpoint-buttons .active{background:#164d43;color:white}