:root{color-scheme:light;--bg:#f6f5ef;--ink:#233c32;--muted:#65746b;--accent:#315f49;--line:#d9dfd5;--surface:#fffef9;font-family:Inter,Segoe UI,Arial,sans-serif;color:var(--ink);background:var(--bg)}
*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button,a,input{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #b88336;outline-offset:5px}[hidden]{display:none!important}h1,h2,p{margin-top:0}h1{font-family:Georgia,serif;font-size:clamp(1.9rem,4vw,3.1rem);font-weight:400;line-height:1.16;letter-spacing:-.035em;margin-bottom:32px}h2{font-size:1.15rem;line-height:1.5}p{line-height:1.7}a{color:var(--accent);overflow-wrap:anywhere}.skip{position:absolute;top:-100px}.skip:focus{top:12px;left:20px;background:white;z-index:5}header{height:84px;padding:0 4vw;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{font-family:Georgia,serif;font-size:1.15rem}.brand em{font-weight:400}.quiet{border:0;background:transparent;color:var(--muted);padding:12px 8px;font-size:.9rem}.quiet:hover{color:var(--ink)}main{max-width:1320px;margin:auto;padding:24px 4vw 60px;outline:none}.eyebrow{font-size:.7rem;letter-spacing:.17em;color:var(--muted);margin-bottom:18px}.muted{color:var(--muted);font-size:.88rem}.primary{border:0;border-radius:999px;padding:16px 25px;background:var(--accent);color:white;min-height:48px;font-size:.92rem}.primary:hover{background:#244d39}.stage-footer{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:28px}.garden{text-align:center;padding-top:7vh}.garden h1{font-size:clamp(1.7rem,3vw,2.5rem)}.node-space{min-height:310px;display:grid;place-items:center}.lesson-node{display:flex;align-items:center;flex-direction:column;gap:16px;background:transparent;border:0;color:var(--ink);max-width:290px;font-size:1.08rem;padding:25px}.node-mark{width:112px;height:112px;display:grid;place-items:center;border:1px solid #b9c6b7;border-radius:50%;font-size:3.3rem;color:#98a694;background:#ecefe6;transition:background .7s,color .7s,box-shadow .7s}.lesson-node small{color:var(--muted);font-size:.78rem}.lesson-node.lit .node-mark{background:#dce9bb;color:var(--accent);box-shadow:0 0 0 12px #eaf0dc}.lesson-node.grow .node-mark{animation:bloom 1.1s ease-out}.garden #garden-message{max-width:580px;margin:20px auto}.video-shell{border-radius:16px;overflow:hidden;background:#111;box-shadow:0 12px 35px #233c320b}.watch h1{margin-bottom:24px;font-size:clamp(1.8rem,3vw,2.6rem)}video{display:block;width:100%;max-height:68vh;aspect-ratio:16/9;background:#111}.exercise{max-width:740px;margin:28px auto 0}.exercise h1{font-size:clamp(1.8rem,3.5vw,2.6rem)}fieldset{padding:0;border:0;min-width:0;margin:0}legend{font-size:1.12rem;line-height:1.65;margin-bottom:22px;width:100%}.option{display:flex;align-items:flex-start;gap:14px;border:1px solid var(--line);border-radius:12px;padding:17px 18px;margin-bottom:12px;line-height:1.55;background:var(--surface);cursor:pointer}.option:has(input:checked){background:#e8efdf;border-color:#6b876d}.option input{margin-top:5px;accent-color:var(--accent);width:17px;height:17px;flex-shrink:0}.notice{padding:12px 16px;background:#fff0da;color:#684515;border-radius:8px;font-size:.88rem}.score{font-family:Georgia,serif;font-size:2.5rem;margin-bottom:12px}.reviews{margin-top:28px}details{border-top:1px solid var(--line);padding:18px 0}summary{cursor:pointer;line-height:1.6;font-size:.95rem}details p{font-size:.92rem;margin:16px 0 0}details ul{padding-left:20px;line-height:1.8;font-size:.9rem}.result-note{font-size:.78rem;color:var(--muted);display:block}.sources{margin:18px 0;font-size:.8rem;line-height:1.7}.sources a{display:block;margin-top:8px}.scenario{max-width:820px}.scenario h1{margin-bottom:24px}.scenario figure{margin:0 0 24px;height:180px;display:grid;place-items:center}.scenario figure img{display:block;max-width:100%;width:100%;height:100%;object-fit:contain}.art-placeholder{height:100%;width:100%;border:1px dashed var(--line);border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:#7c8b7f;font-size:.75rem}.art-placeholder span{font-size:2.2rem;opacity:.65}.case-context{line-height:1.8;font-size:1.05rem}.evidence{border-left:3px solid #bbcba7;padding:2px 0 2px 22px;margin-bottom:24px}.evidence h2{font-size:.82rem;color:var(--muted)}.scenario legend{font-size:1rem}dialog{position:fixed;inset:0 0 0 auto;margin:0;height:100dvh;max-height:100dvh;width:min(360px,90vw);max-width:none;border:0;border-left:1px solid var(--line);padding:28px;background:var(--surface);color:var(--ink);box-shadow:-20px 0 60px #162d3214}dialog::backdrop{background:#18302340}.drawer-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:35px}.drawer-head h2{font-family:Georgia,serif;font-size:1.6rem;font-weight:400;margin:0}nav{display:grid;gap:10px;margin-bottom:32px}nav button{text-align:left;display:flex;gap:16px;border:0;background:transparent;padding:16px 10px;color:var(--muted)}nav button[aria-current]{background:#eaf0e2;color:var(--ink);border-radius:8px}dialog p{font-size:.8rem;color:var(--muted)}@keyframes bloom{0%{transform:scale(.86);box-shadow:0 0 0 0 #dce9bb}60%{transform:scale(1.06);box-shadow:0 0 0 25px #eaf0dc}100%{transform:scale(1);box-shadow:0 0 0 12px #eaf0dc}}@media(max-width:600px){header{height:68px;padding:0 16px}.brand{font-size:.95rem}.quiet span{display:none}main{padding:20px 20px 40px}.exercise{margin-top:12px}.stage-footer{align-items:stretch;flex-direction:column;gap:15px}.stage-footer .primary{align-self:flex-end}.watch .stage-footer .muted{font-size:.78rem}.option{padding:14px;font-size:.9rem}.garden{padding-top:8vh}.node-space{min-height:280px}.scenario figure{height:150px}.case-context{font-size:.95rem}video{max-height:none}.score{font-size:2.1rem}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Real artwork stays inside its reserved space, including intrinsic-size images. */
.scenario figure{display:block;height:260px}
.scenario figure img{width:100%;height:100%;max-height:100%;min-height:0;object-fit:contain}
@media(max-width:600px){.scenario figure{height:200px}}

/* A single botanical node: quiet before practice, luminous after completion. */
.node-space{min-height:340px}
.lesson-node{max-width:340px;padding:30px 40px;gap:21px;border-radius:28px}
.node-mark{position:relative;width:154px;height:154px;border:1px solid #d6dfcf;background:radial-gradient(circle at 35% 22%,#fffffb,#eef1e6 75%);color:#71876a;box-shadow:0 8px 24px #324b3210,inset 0 0 0 7px #ffffff70;transition:transform .3s,box-shadow .5s,background .5s}
.node-mark::before{content:"";position:absolute;inset:-12px;border:1px solid #dce3d480;border-radius:50%;pointer-events:none}
.node-mark svg{width:106px;height:106px;overflow:visible}
.seed-ground{fill:#71876a18}.seed-stem,.seed-vein{stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}.seed-leaf{fill:#b6c6a3;stroke:currentColor;stroke-width:1.5;stroke-linejoin:round}.leaf-right{fill:#d0dbbd}.seed-vein{stroke-width:1.2;opacity:.7}.seed-light{fill:#b89f56;opacity:0;transition:opacity .5s}
.node-badge{position:absolute;bottom:-10px;left:50%;transform:translateX(-50%);min-width:35px;padding:5px 9px;border:1px solid #d6dfcf;border-radius:20px;background:var(--bg);color:var(--muted);font:10px/1.2 Inter,Segoe UI,sans-serif;letter-spacing:.08em}
.node-title{font-family:Georgia,serif;font-size:1.65rem;line-height:1.2;letter-spacing:-.025em;margin-top:6px}
.lesson-node small{font-size:.75rem;letter-spacing:.025em;margin-top:-10px}
.lesson-node:hover .node-mark{transform:translateY(-4px);box-shadow:0 16px 30px #324b3219,inset 0 0 0 7px #ffffff80}
.lesson-node.lit .node-mark{color:#365e40;background:radial-gradient(circle at 35% 22%,#fffde7,#e5edca 75%);box-shadow:0 0 35px #c8d58a45,inset 0 0 0 7px #fffef370}
.lesson-node.lit .seed-leaf{fill:#8faf75}.lesson-node.lit .leaf-right{fill:#bacf8d}.lesson-node.lit .seed-light{opacity:1}.lesson-node.lit .node-badge{background:#edf2df;border-color:#c5d1af;color:#365e40}.lesson-node.grow .node-mark{animation:seed-bloom 1.1s ease-out}
@keyframes seed-bloom{0%{transform:scale(.9);filter:brightness(1)}55%{transform:scale(1.07);filter:brightness(1.1)}100%{transform:scale(1);filter:brightness(1)}}
@media(max-width:600px){.node-space{min-height:320px}.node-mark{width:140px;height:140px}.node-title{font-size:1.5rem}.lesson-node{padding:26px 30px}}

/* Completion unfolds in order: light, connecting stem, then the next lesson. */
.garden.has-growth{padding-top:3vh}
.garden.has-growth .node-space{min-height:0}
.garden.has-growth .lesson-node{padding-bottom:14px}
.lesson-node.lit .node-mark{color:#f1f6d3;border-color:#66874b;background:radial-gradient(circle at 35% 20%,#739857,#315c40 78%);box-shadow:0 0 0 8px #dfe9bc80,0 0 48px #a6bf6870,inset 0 0 0 6px #f4f7d222}
.lesson-node.lit .seed-leaf{fill:#c7de8e;stroke:#eef4c9}.lesson-node.lit .leaf-right{fill:#e8edaf}.lesson-node.lit .seed-ground{fill:#e3edb940}.lesson-node.lit .seed-light{fill:#fff2b6}.lesson-node.lit .node-badge{background:#e9efc9;color:#31563b;border-color:#b8cb88}
.lesson-node.lit #node-status{color:#365f3e;font-weight:600}
.lesson-node.grow .node-mark{animation:completion-light 1.3s ease-out}
.lesson-node.grow .node-mark::before{animation:completion-ring 1.7s ease-out}
.next-growth{display:flex;flex-direction:column;align-items:center;padding-bottom:12px}
.growth-link{width:70px;height:58px;overflow:visible}.growth-link path{fill:none;stroke:#93aa77;stroke-width:2;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:0}
.next-node{display:flex;align-items:center;gap:17px;text-align:left;padding:18px 24px;border:1px solid #d7dfcf;border-radius:22px;background:#ffffff60;max-width:340px}
.next-node-mark{display:grid;place-items:center;width:64px;height:64px;flex-shrink:0;border-radius:50%;background:#e8ede0;border:1px solid #d2ddc7}.next-node-mark svg{width:44px;height:44px;stroke:#8a9b7d;stroke-width:1.5;fill:#ced9bd}
.next-node-copy{display:flex;flex-direction:column;gap:7px}.next-node-copy small{font-size:.6rem;letter-spacing:.08em;color:#76856b}.next-node-copy strong{font:1.15rem Georgia,serif}.next-node-copy>span{font-size:.75rem;color:var(--muted)}
.new-growth .growth-link path{animation:draw-stem .8s .7s both ease-out}
.new-growth .next-node{animation:next-sprout .85s 1.4s both cubic-bezier(.2,.8,.3,1)}
@keyframes completion-light{0%{transform:scale(.85);filter:brightness(.8)}45%{transform:scale(1.12);filter:brightness(1.35)}100%{transform:scale(1);filter:brightness(1)}}
@keyframes completion-ring{0%{transform:scale(.8);opacity:1;border-color:#b5cb73}100%{transform:scale(1.65);opacity:0;border-color:#b5cb73}}
@keyframes draw-stem{from{stroke-dashoffset:1}to{stroke-dashoffset:0}}
@keyframes next-sprout{from{opacity:0;transform:translateY(-14px) scale(.85)}to{opacity:1;transform:translateY(0) scale(1)}}
@media(max-width:600px){.garden.has-growth{padding-top:0}.garden.has-growth h1{font-size:1.65rem;margin-bottom:16px}.garden.has-growth .lesson-node{padding-top:20px}.next-node{max-width:100%;padding:16px;gap:12px}.next-node-copy strong{font-size:1rem}.garden.has-growth #garden-message{font-size:.78rem;margin-top:12px}}

/* Reusable course path and learning materials. */
.course-branch{display:flex;flex-direction:column;align-items:center;width:100%}
.course-branch .node-title{max-width:270px;text-wrap:balance}
.course-branch .lesson-node.lit .node-status{color:#365f3e;font-weight:600}
.new-growth .lesson-node{animation:next-sprout .85s 1.4s both cubic-bezier(.2,.8,.3,1)}
#course-menu{display:grid;gap:6px;margin-bottom:22px}#course-menu .eyebrow{margin-bottom:4px}#course-menu button{text-align:left;padding:12px;border:1px solid transparent;background:transparent;border-radius:8px;color:var(--muted);font-size:.85rem;line-height:1.5}#course-menu button[aria-current]{border-color:var(--line);color:var(--ink)}
.material-table{overflow-x:auto;margin:18px 0}.material-table table{width:100%;border-collapse:collapse;font-size:.95rem;line-height:1.7}.material-table th,.material-table td{text-align:left;border-bottom:1px solid var(--line);padding:10px 12px}.material-table th{background:#e9efdf}
blockquote{margin:16px 0;padding:16px 20px;background:#edf0e6;border-left:3px solid #b8c7a8;line-height:1.85}.case-context p{margin-bottom:16px}legend p:last-child{margin-bottom:0}legend .material-table{font-size:.92rem}.option-letter{color:var(--muted)}.scenario-assessment{margin:25px 0}#case-feedback>p{font-size:1.05rem}html[lang="zh-CN"] h1,html[lang="zh-CN"] .node-title{font-family:Georgia,'Microsoft YaHei',sans-serif;line-height:1.4}
@media(max-width:600px){.course-branch .lesson-node{max-width:100%}.course-branch .node-title{font-size:1.35rem}.material-table th,.material-table td{padding:8px}.material-table table{font-size:.85rem}#case-feedback>p{font-size:.95rem}}

/* Every course uses the same visual states; availability is not completion. */
.lesson-node:not(.lit) .node-mark{color:#998571;border-color:#d9cdbd;background:radial-gradient(circle at 35% 22%,#fffaf3,#eae0d2 78%);box-shadow:0 8px 24px #70583d0b,inset 0 0 0 7px #ffffff60}
.lesson-node:not(.lit) .node-mark::before{border-color:#e3d9cb90}
.lesson-node:not(.lit) .seed-leaf{fill:#d5c2a9;stroke:#a18b73}
.lesson-node:not(.lit) .leaf-right{fill:#e4d5bf}
.lesson-node:not(.lit) .seed-ground{fill:#99857118}
.lesson-node:not(.lit) .seed-light{opacity:0}
.lesson-node:not(.lit) .node-badge{background:#f5eee4;border-color:#d9cdbd;color:#89735d}
.lesson-node:not(.lit):hover .node-mark{box-shadow:0 14px 28px #70583d18,inset 0 0 0 7px #ffffff80}

/* Lesson 03 is an explainable topic proposal, not a completed course. */
.topic-node-note{font-size:.8rem;line-height:1.8;color:var(--muted);margin:0 0 16px;text-align:center}
.topic-original{background:#edf1e6;padding:16px 20px;border-radius:10px;margin:16px 0}.topic-original strong{display:block;margin-bottom:10px}.topic-original p:last-child{margin-bottom:0}
.topic-page{max-width:900px}.topic-page h1{font-family:Georgia,'Microsoft YaHei',sans-serif;line-height:1.5;font-size:clamp(1.8rem,4vw,2.5rem)}
.topic-page h2{font:600 1.15rem/1.7 'Microsoft YaHei',sans-serif;margin:24px 0 12px}.topic-page h3{font-size:1rem;line-height:1.7;margin:0 0 8px}
.topic-tag{display:inline-block;border:1px solid #ccd8bb;background:#edf2e4;border-radius:20px;padding:7px 15px;font-size:.8rem;line-height:1.7;margin:0 0 12px}.topic-lead{font-size:1.1rem;line-height:1.9;color:var(--muted)}
.topic-reason,.topic-example,.topic-limit{border:1px solid var(--line);border-radius:16px;padding:22px 26px;margin:24px 0;background:#f0f3e7}.topic-reason h2,.topic-example h2{margin-top:0}.topic-page p,.topic-page li{line-height:1.9}.topic-goals{padding-left:26px}.topic-goals li{padding:5px 0 5px 8px}.topic-example{background:#fffdf6;border-style:dashed}
.topic-dimensions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.topic-dimensions article{padding:18px;border:1px solid var(--line);border-radius:12px;background:#ffffff55}.topic-dimensions p{font-size:.85rem;margin:8px 0}.topic-dimensions small{font-size:.8rem;color:var(--muted);line-height:1.8}
#topic-scope,#topic-dates{font-size:.85rem;overflow-wrap:anywhere}.topic-limit{background:#e9eee3;font-size:.9rem}.topic-limit p:last-child{margin-bottom:0}.topic-actions{display:flex;align-items:center;flex-wrap:wrap;gap:16px;margin:28px 0}.topic-actions button{min-height:44px}.topic-page details li{overflow-wrap:anywhere}.topic-page summary{line-height:1.7}
@media(max-width:600px){.topic-dimensions{grid-template-columns:1fr}.topic-reason,.topic-example,.topic-limit{padding:18px}.topic-actions{align-items:stretch;flex-direction:column}.topic-page h1{font-size:1.75rem}.topic-node-note{font-size:.75rem;padding:0 10px}}

/* Optional settings and generated text lessons */
.lab-settings{max-width:680px;width:calc(100% - 32px);max-height:88vh;overflow:auto;padding:24px;border:1px solid #c8cbbd;border-radius:20px;background:#faf9f3;color:#273c32}.lab-settings label,#lab-view label{display:block;margin:16px 0}.lab-settings input,.lab-settings select,.lab-settings textarea,#lab-direction{display:block;width:100%;box-sizing:border-box;padding:12px;margin-top:8px;border:1px solid #bfc6ba;border-radius:8px;background:white;color:#273c32;font:inherit}#lab-view pre,.lab-settings pre{white-space:pre-wrap;overflow-wrap:anywhere;max-height:320px;overflow:auto;font-size:13px}#lesson-material{font-size:1.15rem;line-height:1.9}#lab-view button,.lab-settings button{margin:8px 8px 8px 0}

.lab-settings button{font:inherit;padding:10px 16px;border:1px solid #bfc6ba;border-radius:18px;background:#eef1e6;color:#273c32;cursor:pointer}#lab-view button:disabled,.lab-settings button:disabled{opacity:.55;cursor:wait}

.media-add { font-size:.8rem; margin-top:.5rem; }
.media-status { max-width:38rem; margin:1rem auto; text-align:center; }
.lab-settings label:has(input[type="checkbox"]) { display:flex; align-items:center; gap:.6rem; }
.lab-settings input[type="checkbox"] { width:auto; }

.media-settings > small { display:block; margin:.65rem 0; }

/* The garden contains courses; each course owns its learning stages. */
#navigation .tree-menu-link{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px;border:1px solid var(--line);border-radius:12px;margin:10px 0 24px;color:var(--ink);background:#edf1e7}
#navigation .tree-menu-link small{font-size:.7rem;color:var(--muted);font-weight:400}
#lesson-menu-group{border-top:0;padding-top:0;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:20px}
#lesson-menu-group>summary{padding:10px 2px;font-size:.8rem;letter-spacing:.04em;cursor:pointer;color:var(--muted)}
#lesson-menu-count{float:right;font-variant-numeric:tabular-nums}
#course-menu{gap:8px;margin:12px 0 0}
.menu-course{padding:0;border:1px solid transparent;border-radius:12px;overflow:hidden}
.menu-course[open]{background:#ffffff65;border-color:var(--line)}
.menu-course>summary{display:flex;align-items:baseline;gap:12px;list-style:none;padding:14px 12px;cursor:pointer;font-size:.88rem;line-height:1.5}
.menu-course>summary::-webkit-details-marker{display:none}
.menu-course>summary::after{content:'+';margin-left:auto;color:var(--muted)}
.menu-course[open]>summary::after{content:'−'}
.menu-course>summary>span{flex:1;min-width:0}
.menu-course-number{font-size:.7rem;color:var(--muted);font-variant-numeric:tabular-nums}
.menu-course-state{display:block;color:var(--muted);font-size:.68rem;font-weight:400;margin-top:3px}
.menu-course.current-course>summary{color:var(--accent);font-weight:600}
#course-menu .menu-stages{display:grid;gap:3px;margin:0 12px 14px 25px;padding-left:10px;border-left:1px solid var(--line)}
#course-menu .menu-stages button{display:flex;align-items:baseline;gap:12px;padding:10px;font-size:.78rem;margin:0;width:100%}
#course-menu .menu-stages button>small{font-size:.64rem;opacity:.7}
#course-menu .menu-stages button[aria-current]{background:#e4ecdd;border-color:transparent;color:var(--accent)}
#course-menu #restart{font-size:.7rem;margin-top:8px;color:var(--muted)}
.menu-utilities{display:grid;gap:2px;margin-bottom:18px}
.menu-section-label{font-size:.68rem;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin:0 0 8px 12px}
#navigation .menu-utilities button{text-align:left;font-size:.78rem}
#navigation>button.quiet{text-align:left;font-size:.8rem;display:block;width:100%;margin:4px 0}