@charset "UTF-8";
:root{--paper:#f7f5ed;--card:#fffdf6;--ink:#253f34;--muted:#6e7869;--green:#345b45;--pale:#e9eddf;--line:#dce0d2;--copper:#a65e3c;--serif:"Noto Serif CJK SC","Songti SC","SimSun",serif;font-family:"Noto Sans CJK SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--paper);font-size:16px;font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button{border:1px solid var(--line);border-radius:9px;background:var(--card);padding:10px 15px;min-height:44px;line-height:1.5}button:hover:not(:disabled){border-color:#859a7a;background:#f0f1e7}button:disabled{cursor:default;opacity:.48}button:focus-visible,a:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #bd754c;outline-offset:4px}a{color:var(--green);text-underline-offset:4px}h1,h2,h3,p{margin-top:0}h1,h2{font-family:var(--serif);font-weight:600}h1{font-size:clamp(32px,4vw,52px);line-height:1.4;letter-spacing:.04em}h2{line-height:1.55;font-size:26px}p{line-height:1.85}small,.muted{color:var(--muted)}.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}.skip-link{position:fixed;left:15px;top:-80px;z-index:100;background:white;padding:14px}.skip-link:focus{top:10px}.site-header{max-width:1320px;margin:auto;padding:23px 36px;display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:13px;border:0;padding:0;background:none;text-align:left;font-family:var(--serif);font-size:23px;letter-spacing:.16em}.brand small{display:block;font:9px/1.5 system-ui,sans-serif;letter-spacing:.19em;margin-top:5px}.seal{border:1px solid #9c6d54;color:#9c6d54;font-family:var(--serif);font-size:22px;width:40px;height:45px;display:grid;place-items:center;border-radius:3px}.site-header nav{display:flex;gap:6px}.site-header nav button{background:none;border-color:transparent;font-size:14px;padding:8px 14px}.site-header nav button[aria-pressed=true]{background:var(--pale)}.save-status{max-width:1248px;margin:9px auto 0;text-align:right;font-size:11px;min-height:17px;color:var(--muted);padding:0 10px}.save-status.error{background:#fff0df;color:#87472e;font-size:14px;text-align:left;padding:12px 18px;border-radius:9px;max-width:1180px}.save-status button{font-size:12px;margin-left:12px;min-height:32px;padding:3px 8px}main{max-width:1248px;margin:auto;padding:17px 28px 50px;min-height:65vh}main:focus{outline:none}.eyebrow{display:block;font-size:12px;letter-spacing:.18em;color:var(--copper);margin-bottom:15px}.hero{position:relative;min-height:515px;border-radius:16px;overflow:hidden;background:#fffdf7;margin:3px 0 44px}.hero-art{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:75% center;mix-blend-mode:multiply}.hero-copy{position:relative;z-index:1;padding:66px 40px 44px;max-width:490px;background:linear-gradient(90deg,rgba(255,253,247,.99) 55%,rgba(255,253,247,0));min-height:515px}.hero h1{font-size:43px;line-height:1.65;margin-bottom:18px}.hero p{font-size:15px;max-width:305px;color:#617161;line-height:2}.hero .primary{margin:8px 0 14px}.hero .hero-meta{font-size:12px;margin:4px 0;letter-spacing:.03em}.primary{background:var(--green);border-color:var(--green);color:#fffef6;padding:12px 24px;box-shadow:0 3px 8px #27443210}.primary:hover:not(:disabled){background:#294d39;color:white;border-color:#294d39}.secondary{background:#eeefe4}.text-button{border-color:transparent;background:none;text-decoration:underline;text-underline-offset:4px}.section-heading{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin:0 0 19px}.section-heading h2{font-size:25px;margin:0}.section-heading p{font-size:13px;margin:0;color:var(--muted)}.unit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.unit-card{background:var(--card);border:1px solid var(--line);border-radius:13px;overflow:hidden}.unit-intro{padding:24px 23px 18px;display:flex;gap:16px;align-items:flex-start;border-bottom:1px solid #e8e9df}.unit-number{font:27px/1 var(--serif);color:#95a187;background:#edf0e4;padding:12px 9px;border-radius:30px 30px 8px 8px}.unit-intro h3{font-family:var(--serif);font-size:21px;margin:0 0 7px}.unit-intro p{font-size:12px;margin:0;color:var(--muted)}.lesson-link{display:flex;align-items:center;gap:10px;text-align:left;width:100%;border:none;border-radius:0;border-bottom:1px solid #f0efe7;padding:12px 20px;font-size:13px;background:none;min-height:52px}.lesson-link .lesson-num{color:#8b927e;font-size:11px;width:21px;flex-shrink:0}.lesson-link .lesson-name{flex:1}.lesson-link .lesson-status{font-size:11px;color:#658067}.lesson-link.current{background:#edf0e5;box-shadow:inset 3px 0 var(--green)}.lesson-link.challenge{color:var(--copper);background:#f8f1e5}.unit-foot{padding:12px 20px;font-size:11px;color:var(--muted)}.map-note{margin-top:23px;font-size:13px;color:var(--muted);max-width:900px}.future{margin-top:30px;border-top:1px solid var(--line);padding-top:20px}.future summary{cursor:pointer;font-size:14px}.stage-list{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:18px}.stage{padding:16px;background:#f0f0e6;border-radius:8px;font-size:13px;line-height:1.8}.stage span{display:block;color:var(--muted);font-size:11px}.lesson-heading{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:18px}.lesson-heading h1{font-size:27px;margin:0;letter-spacing:.02em}.breadcrumb{font-size:12px;color:var(--muted);margin-bottom:7px}.lesson-heading button{font-size:13px}.lesson-shell{display:grid;grid-template-columns:minmax(0,1fr) 370px;gap:36px;align-items:start}.board-column{min-width:0}.board-top{display:flex;justify-content:space-between;align-items:center;font-size:12px;padding:0 7px 13px;gap:10px}.turn{display:flex;align-items:center;gap:8px;line-height:1.6}.chip{display:inline-block;background:#e6ecdd;padding:4px 10px;border-radius:20px;font-size:11px;white-space:nowrap}.chip.independent{color:#885233;background:#f4e7d8}.stone-icon{width:15px;height:15px;border-radius:50%;background:#25372c;box-shadow:inset 0 1px 3px #ffffff66,0 1px 3px #3333;flex-shrink:0}.stone-icon.white{background:#fffdf0;border:1px solid #c1b895}.board-wrap{max-width:598px;margin:auto;background:#eee3cc;padding:12px;border:1px solid #cdbb99;border-radius:15px;box-shadow:0 8px 25px #533d2112,0 2px 3px #76664715}.goban{width:100%;aspect-ratio:1;position:relative;background:linear-gradient(115deg,#e5c99b,#ecd3a9 43%,#e6c594);border-radius:5px;box-shadow:inset 0 0 45px #a7783820}.goban svg{display:block;width:100%;height:100%;pointer-events:none}.grid path{fill:none;stroke:#88714f;stroke-width:1.05}.grid text{text-anchor:middle;fill:#786344;font-size:13px;font-family:system-ui,sans-serif}.stars{fill:#756143}.stone{filter:drop-shadow(1px 3px 2px #49371944)}.target-mark{fill:none;stroke:#9c512f;stroke-width:2;stroke-dasharray:5 4}.selection-mark{fill:#40684f;stroke:#fff8e5;stroke-width:2}.selection-number{fill:white;text-anchor:middle;font:13px system-ui,sans-serif;font-weight:600}.hint-mark{fill:#fbf6cf55;stroke:#a5532d;stroke-width:2.5;stroke-dasharray:4 3}.last-mark{fill:#7c725e}.last-mark.on-black{fill:#f5edcf}.point{position:absolute;width:9.4%;height:9.4%;transform:translate(-50%,-50%);padding:0;min-height:0;background:none;border:none;border-radius:50%;touch-action:manipulation}.point:hover:not(:disabled){background:#2e57382a;border:1px solid #385e3e75}.point:focus-visible{outline:3px solid #874827;outline-offset:-5px}.point:disabled{opacity:1}.high-contrast{background:#f1d7a8}.high-contrast .grid path{stroke:#35291c;stroke-width:1.65}.high-contrast .grid text{fill:#292419}.board-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:14px 4px;font-size:11px;color:var(--muted);flex-wrap:wrap}.board-context{padding:12px 15px;border-left:3px solid #c2cbb2;font-size:12px;line-height:1.8;color:#68735f;background:#f0f0e6;margin:12px 0}.task-panel{background:var(--card);border:1px solid var(--line);border-radius:13px;padding:22px 24px;min-width:0}.task-progress{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--muted);margin-bottom:20px}.progress-dot{height:5px;flex:1;background:#e6e8dd;border-radius:4px}.progress-dot.done{background:#779775}.progress-dot.active{background:var(--copper)}.tutor{display:flex;align-items:center;gap:14px;margin-bottom:15px}.panda{width:74px;height:74px;flex-shrink:0;background:url('assets/art/panda.png') 0 0/300% 200%;mix-blend-mode:multiply}.tutor small{display:block;font-size:11px;line-height:1.8}.tutor strong{font-family:var(--serif);font-size:17px;font-weight:500}.task-panel h2{font-family:inherit;font-size:22px;line-height:1.7;margin:13px 0 16px;font-weight:600}.task-panel .subtask{font-size:12px;color:var(--copper);letter-spacing:.08em}.task-panel p{font-size:13px}.task-intro{margin:17px 0 0;border-top:1px solid var(--line);padding-top:13px}.task-intro summary{font-size:12px;cursor:pointer;color:var(--muted)}.task-intro p{font-size:12px;margin:8px 0 0}.choice-list{display:grid;gap:8px;margin:12px 0}.choice{font-size:13px;text-align:left;padding:12px;display:flex;gap:10px;align-items:flex-start}.choice .radio{border:1px solid #87987d;display:block;flex-shrink:0;width:17px;height:17px;margin-top:3px;border-radius:50%}.choice[aria-pressed=true]{background:#e9efdf;border-color:#658361}.choice[aria-pressed=true] .radio{background:#4c714e;box-shadow:inset 0 0 0 3px #e9efdf}.response-state{min-height:24px;font-size:12px;color:#687760;margin-bottom:12px;line-height:1.75}.action-main{width:100%;font-size:14px;min-height:48px}.utility-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:9px}.utility-row button{font-size:11px;flex:1;padding:7px;min-height:38px}.help-row{border-top:1px solid var(--line);padding-top:14px;display:flex;gap:8px;margin-top:18px}.help-row button{font-size:12px;flex:1;padding:7px}.hint-text{font-size:12px!important;background:#f3eddf;border-radius:7px;padding:11px 13px;margin:13px 0 0;line-height:1.85}.feedback{background:#eaf0df;border-radius:10px;padding:16px;margin-bottom:17px}.feedback.retry{background:#f7eddf}.feedback h3{font-size:18px;margin:0 0 7px}.feedback p{margin:0}.feedback-steps{display:grid;gap:9px;margin:15px 0}.feedback-step{border:1px solid var(--line);border-radius:8px;padding:12px}.feedback-step p{font-size:12px;margin-bottom:5px}.feedback-step button{min-height:30px;padding:3px 7px;font-size:11px}.record-label{font-size:11px;color:var(--muted);line-height:1.85;margin:13px 0}.complete-flower{font:40px/1 var(--serif);color:#7e9970;margin:10px 0 20px}.completion-panel h2{font-family:var(--serif);font-size:28px}.note-label{display:block;font-size:12px;margin:20px 0 8px}.note-input{width:100%;min-height:85px;resize:vertical;border:1px solid var(--line);border-radius:8px;padding:11px;font-size:13px;line-height:1.8;background:#fffefa;color:var(--ink)}.pause-card{padding:22px 10px;text-align:center}.pause-card p{font-size:14px}.pause-card button{display:block;margin:15px auto 0}dialog{border:1px solid #d2d9c7;border-radius:17px;background:var(--paper);color:var(--ink);padding:28px;width:min(760px,calc(100% - 28px));max-height:88dvh;box-shadow:0 22px 80px #1e2e2738}dialog::backdrop{background:#1b302961;backdrop-filter:blur(3px)}#pause-dialog{max-width:410px}.dialog-head{display:flex;justify-content:space-between;gap:15px;align-items:flex-start}.dialog-head h2{margin:0}.dialog-head button{font-size:12px}.notebook-summary{padding:17px 20px;background:var(--pale);border-radius:10px;margin:20px 0;font-size:13px;line-height:1.85}.evidence-unit{border-bottom:1px solid var(--line);padding:16px 0;font-size:13px}.evidence-unit h3{font:19px var(--serif);margin-bottom:10px}.evidence-unit p{margin:6px 0}.evidence-unit button{font-size:12px}.notebook-lesson{padding:14px 0}.notebook-lesson summary{cursor:pointer;font-size:13px}.attempt-row{font-size:11px;line-height:1.8;padding:9px 0;border-bottom:1px dotted var(--line)}.backup-actions{display:flex;gap:9px;flex-wrap:wrap;margin:20px 0}.backup-actions button{font-size:12px}.settings{display:flex;flex-wrap:wrap;gap:14px;font-size:12px;margin:20px 0;align-items:center}.settings label{display:flex;gap:7px;align-items:center}.settings input{accent-color:var(--green);width:17px;height:17px}.settings select{padding:5px;border:1px solid var(--line);background:var(--card);border-radius:4px}.danger-zone{border-top:1px solid var(--line);margin-top:20px;padding-top:17px}.danger-zone summary{font-size:12px;cursor:pointer;color:#8b573a}.danger-zone p{font-size:12px}.import-preview{padding:15px;border:1px solid #9aaa8c;border-radius:8px;background:#edf0e4}.import-preview p{font-size:13px}.import-error{color:#8b442a;font-size:13px}.site-footer{max-width:1248px;margin:auto;padding:23px 28px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;font-size:11px;line-height:1.8;color:#87907d}.site-footer a{margin-left:15px}.quiet .tutor{display:none}.quiet .hero-art{opacity:.52}.quiet *{scroll-behavior:auto!important;animation:none!important;transition:none!important}.large-text{font-size:19px}.large-text .task-panel h2{font-size:25px}.large-text .task-panel p,.large-text .choice{font-size:16px}.large-text .lesson-link{font-size:15px}.empty-message{padding:30px}.preview-note{color:#976038}.voice-status{font-size:11px;line-height:1.6;margin-top:7px;color:var(--muted)}
@media(min-width:1200px) and (max-height:850px){.site-header{padding-top:14px;padding-bottom:14px}main{padding-top:10px}.lesson-heading{margin-bottom:10px}.board-wrap{max-width:510px}.lesson-shell{gap:30px;grid-template-columns:minmax(0,1fr) 385px}.task-panel{padding:17px 22px}.tutor{margin-bottom:8px}.panda{width:60px;height:60px}.task-panel h2{font-size:20px}.board-bottom{margin-top:9px}.lesson-heading h1{font-size:25px}}
@media(max-width:1000px){.unit-grid{gap:12px}.unit-intro{padding:20px 15px}.unit-intro h3{font-size:18px}.lesson-link{padding:11px 13px;font-size:12px}.lesson-shell{grid-template-columns:minmax(0,1fr) 320px;gap:20px}.task-panel{padding:18px}.task-panel h2{font-size:19px}.hero-copy{max-width:430px}.hero h1{font-size:38px}.stage-list{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){.site-header{padding:16px 19px;gap:9px}.brand{font-size:19px;gap:9px}.brand small{font-size:7px}.seal{font-size:19px;width:33px;height:38px}.site-header nav{gap:0}.site-header nav button{font-size:12px;padding:7px 8px}.site-header nav #quiet-button{display:none}main{padding:14px 17px 35px}.hero{min-height:520px;margin-bottom:28px}.hero-copy{padding:29px 24px;background:linear-gradient(180deg,#fffdf7 53%,#fffdf700);max-width:100%;min-height:330px}.hero h1{font-size:32px;line-height:1.5;max-width:280px;margin-bottom:12px}.hero-copy p{font-size:13px;max-width:260px;line-height:1.9}.hero-art{height:340px;top:auto;bottom:0;object-position:right bottom;object-fit:cover}.hero .primary{padding:10px 19px;min-height:44px}.hero .hero-meta{font-size:10px}.section-heading{align-items:flex-start;gap:10px}.section-heading h2{font-size:23px}.section-heading p{font-size:11px;max-width:120px}.unit-grid{grid-template-columns:1fr;gap:19px}.unit-intro{padding:20px}.unit-intro h3{font-size:21px}.lesson-link{padding:13px 22px;font-size:14px}.unit-foot{font-size:12px}.lesson-heading{align-items:flex-start;margin-bottom:14px}.lesson-heading h1{font-size:21px}.breadcrumb{font-size:10px}.lesson-heading button{padding:5px 10px;min-height:34px;font-size:11px}.lesson-shell{display:flex;flex-direction:column;gap:17px}.board-column{width:100%}.board-wrap{max-width:490px;padding:8px;border-radius:11px}.board-top{font-size:11px;padding-bottom:9px}.board-bottom{font-size:10px;margin:10px 2px}.task-panel{width:100%;padding:19px 20px}.tutor{display:none}.task-progress{margin-bottom:11px}.task-panel h2{font-size:19px;margin:8px 0 12px}.help-row{margin-top:12px;padding-top:11px}.board-context{font-size:11px;margin:8px 0}.task-panel .subtask{font-size:11px}.site-footer{padding:18px;display:block;font-size:10px}.site-footer span{display:block;margin-bottom:5px}.save-status{font-size:10px;margin-top:6px;min-height:13px}.save-status.error{font-size:12px;margin:8px 17px;padding:10px 13px}.stage-list{grid-template-columns:1fr 1fr;gap:9px}.stage{font-size:11px;padding:11px}dialog{padding:20px}.dialog-head h2{font-size:23px}.notebook-summary{padding:13px;font-size:12px}.large-text .task-panel h2{font-size:23px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
.mobile-task{display:none}
@media(max-width:760px){.mobile-task{display:block;font-size:15px;font-weight:600;line-height:1.8;margin:0 0 13px;padding-bottom:12px;border-bottom:1px solid var(--line)}}
.completion-panel .action-main{margin-top:16px}
.teaching-suspended .departing-stone{animation-play-state:paused}
.legacy-notice{display:flex;gap:16px;align-items:center;justify-content:space-between;margin:0 0 18px;padding:12px 16px;background:#f1ede1;border:1px solid var(--line);border-radius:8px;font-size:13px;line-height:1.7}.legacy-notice button{flex-shrink:0}@media(max-width:760px){.legacy-notice{display:block}.legacy-notice button{display:block;margin-top:8px}}
.relation{stroke:#286749;stroke-width:4;fill:none;stroke-linecap:round}.relation.diagonal,.relation.distant,.relation.blocked{stroke:#ac523b;stroke-dasharray:4 5;stroke-width:3}.attention-ring{fill:none;stroke:#c58a37;stroke-width:4}.rejected-mark{fill:#fff2e6cc;stroke:#ac523b;stroke-width:2.5}.board-boundary{stroke:#ac523b;stroke-width:4;stroke-dasharray:6 5}.boundary-label{font-size:12px;fill:#8e432d;text-anchor:middle}
.departing-stone{fill:#fffaf0;stroke:#d3b893;stroke-width:2;opacity:0;animation:stone-depart 1.1s ease-out both}@keyframes stone-depart{from{opacity:.9;transform:translateY(0)}to{opacity:0;transform:translateY(-25px)}}.quiet .departing-stone{animation:none}.guided-response.trial{background:#f8ecdf;color:#854f34}.independent-intro{font-size:14px;padding:12px 14px;line-height:1.8;background:#edf1e6;border-radius:8px;margin:0 0 16px}
.panda[data-pose="look"],.panda[data-pose="point"]{background-position:100% 0}.panda[data-pose="wait"]{background-position:0 0}.panda[data-pose="hold"]{background-position:0 100%}.panda[data-pose="handoff"],.panda[data-pose="welcome"]{background-position:100% 100%}
.teaching-lesson .task-panel{padding:28px}.teaching-lesson .tutor{align-items:center}.teaching-lesson .tutor strong,.teaching-lesson .tutor small{display:block}.teaching-lesson .tutor strong{margin-top:4px}.teaching-lesson .teaching-subtitle{font-size:22px;line-height:1.85;min-height:124px;font-weight:500}.liberty-counter{display:flex;gap:14px;align-items:baseline;padding:14px 0;margin:0 0 15px;border-bottom:1px solid var(--line)}.liberty-counter strong{font-size:43px;font-family:Georgia,serif;font-weight:400;color:var(--green)}.liberty-counter span{font-size:13px;color:var(--muted)}.guided-response{padding:14px 16px;background:#edf2e6;border-radius:9px;line-height:1.9;font-size:16px}.guided-response.diagonal,.guided-response.occupied,.guided-response.distant{background:#f8ecdf;color:#854f34}.practice-note{font-size:12px;color:var(--muted);line-height:1.9}.narration-controls{display:flex;gap:15px;align-items:center;margin-top:12px;font-size:12px}.narration-controls button{padding:6px 0}.narration-controls select{font:inherit;color:inherit;background:#faf8f1;border:1px solid var(--line);padding:6px;border-radius:5px}.teaching-skip{margin-top:18px;font-size:12px}.teaching-lesson .utility-row{flex-wrap:wrap}.teaching-lesson .voice-status{min-height:18px}
@media(max-width:760px){.teaching-lesson .mobile-task{display:flex;gap:12px;align-items:center;min-height:80px;font-size:14px;line-height:1.75;padding-bottom:10px}.teaching-lesson .mobile-task .panda{display:block;width:64px;height:64px;flex-shrink:0}.teaching-lesson .task-panel{padding:16px 19px}.teaching-lesson .tutor{display:none}.teaching-lesson .teaching-subtitle{min-height:0;font-size:17px;line-height:1.8}.teaching-lesson .liberty-counter{padding:3px 0;margin:0 0 9px}.teaching-lesson .liberty-counter strong{font-size:31px}.teaching-lesson .guided-response{margin-top:8px}.teaching-lesson{gap:9px}.teaching-lesson .board-bottom{margin:7px 0}.teaching-lesson .task-panel h2{font-size:18px}}