/* Reading-first layout shared by the map and every generated course. */
:root{--bg:#f5f4ef;--paper:#fff;--ink:#20312f;--muted:#526660;--line:#dbe3dc;--blue:#116b59;--green:#116b59;--soft-blue:#edf6f1;--soft-green:#edf6f1;--shadow:0 8px 25px #213c2a07}
html{scroll-behavior:smooth;scroll-padding-top:85px}body{background:#f5f4ef;color:var(--ink);font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.8}button,input,select{font:inherit}button,a,input{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #df9635;outline-offset:4px}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}a{overflow-wrap:anywhere}p,li,dd{overflow-wrap:anywhere}img,svg{max-width:100%}pre{overflow:auto;max-width:100%;white-space:pre;tab-size:4}pre code{white-space:pre!important;overflow-wrap:normal!important;word-break:normal!important}table{border-collapse:collapse;max-width:100%}th,td{vertical-align:top}*{min-width:0}
.shell{width:min(1100px,calc(100% - 40px));padding:24px 0 56px}.top{position:sticky;top:0;z-index:20;min-height:60px;margin:0 0 24px;padding:10px 0;background:#f5f4eff5;border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}.top .ghost{border:0;background:transparent;padding-left:0}.hud{flex-wrap:wrap;gap:8px}.pill,.chip,.badge,.level-pill,.todo-pill{font-size:12px;line-height:1.55;white-space:normal}.pill{border:1px solid var(--line);background:#fff}.hero{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:26px;align-items:start;margin-bottom:26px}.hero-main,.hero-map,.map-art{background:transparent;box-shadow:none;border:0;padding:0}.hero-main{display:block}.hero h1{font-size:clamp(27px,3.3vw,40px);line-height:1.35;letter-spacing:-.025em;max-width:24ch}.course-subtitle{font-size:14px;color:var(--muted);margin:8px 0 16px;line-height:1.6}.hero .lead{font-size:16px;line-height:1.95;max-width:64ch}.eyebrow{font-size:12px;letter-spacing:.08em;color:#116b59;margin:0 0 12px}.hero .meta{margin:16px 0;gap:6px}.hero .meta>.pill:first-child{display:none}.xp-wrap{height:5px;margin-top:20px;box-shadow:none;border:0;background:#dfe8df}.xp-bar{background:#14755c}.course-overview{padding:20px 22px;background:#e9eee5;border-radius:16px;border:1px solid #d8e1d2}.course-overview h2{font-size:14px;margin:0 0 12px}.course-overview ol{list-style:none;margin:0;padding:0;counter-reset:course}.course-overview li{margin:12px 0;line-height:1.55;font-size:13px;counter-increment:course}.course-overview li a{display:block;text-decoration:none}.course-overview li a::before{content:counter(course,decimal-leading-zero) '  ';font-variant-numeric:tabular-nums;color:#14755c;font-weight:700}.official-notebook{display:inline-flex;align-items:center;justify-content:center;background:#116b59;color:white!important;border-radius:9px;padding:11px 17px;text-decoration:none!important;font-weight:650;line-height:1.5}.official-notebook:hover{background:#085142}.lesson-card{padding:30px 34px;background:#fff;box-shadow:var(--shadow);border:1px solid var(--line);border-radius:16px;gap:15px;margin:0}.lessons{display:grid;gap:24px}.lesson-card h2{font-size:clamp(22px,2.3vw,28px);line-height:1.5;color:#183d32;margin:4px 0}.lesson-card h3{font-size:17px;line-height:1.6}.lesson-card h4{font-size:16px;line-height:1.65;margin:0 0 8px}.lesson-section{padding:0}.lesson-top{gap:8px;flex-wrap:wrap}.level-pill{background:#e5f0e9;color:#17644e}.todo-pill{background:#f6f1e7;border-color:#e7dfcb;color:#765a32}.lesson-section.intuition{background:transparent;border:0;padding:0}.lesson-card p,.lesson-card li{line-height:1.95;font-size:16px}.lesson-section.intuition>p{color:#344c43}.lesson-card .checkpoint{border-top:1px solid var(--line);padding-top:22px;margin-top:10px}.checkpoint-options,.predict-options{gap:9px}.checkpoint-option,.predict-option{padding:13px 16px;border-radius:10px;background:#fafbf8;border:1px solid #d9e3dc;align-items:flex-start}.checkpoint-option input,.predict-option input{margin-top:7px;accent-color:#14755c;width:17px;height:17px;flex-shrink:0}.checkpoint-option span,.predict-option span{font-size:15px;line-height:1.8}.feedback:empty{display:none}.feedback,.predict-feedback{border-radius:9px;font-size:14px;line-height:1.8}.homework{background:#f7f8f4!important;border:1px solid #e3e8de!important;padding:18px!important;border-radius:12px}.homework-item{font-size:14px;align-items:flex-start}.homework-item input{margin-top:7px;accent-color:#14755c}.lesson-section.homework h3{font-size:15px}.lesson-section.homework>p{font-size:14px;color:var(--muted)}.shell > .complete{margin-top:26px;padding:24px;background:#e9eee5;border-radius:14px;gap:20px;align-items:center}.shell > .complete>div:last-child{display:flex;gap:10px;flex-wrap:wrap}.primary{background:#116b59;border-color:#116b59}.notebook-guide{margin:26px 0 0;padding:28px 32px;box-shadow:none;background:#edf2e9;border:1px solid #d8e2d2;border-radius:16px}.notebook-guide h2{font-size:23px;line-height:1.5}.notebook-guide p{font-size:15px;line-height:1.9}.notebook-guide a:not(.official-notebook){color:#116b59;text-decoration:underline}.notebook-guide .source-note{font-size:12px;color:#53665c}.notebook-content{overflow:visible}.notebook-content table,.lesson-card table{display:block;overflow-x:auto;width:100%;font-size:14px}.notebook-content td,.notebook-content th,.lesson-card td,.lesson-card th{padding:10px 12px;border:1px solid #dbe3dc;min-width:100px}.notebook-content img{display:block;max-height:480px;object-fit:contain;margin:20px auto}.katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden;padding:5px 0}.katex{font-size:1.05em}.lesson-card :not(pre)>code{background:#eef3ee;border-radius:4px;color:#365545;padding:1px 4px}.syntax-card pre,.code-walk pre{padding:20px;background:#18332d;color:#eff7ed;border:0;border-radius:12px;line-height:1.8;font-size:14px}.concept-glossary{margin:22px 0}.concept-glossary dl{margin:0;border-top:1px solid var(--line)}.concept-glossary dl>div{display:grid;grid-template-columns:minmax(100px,170px) minmax(0,1fr);gap:18px;padding:15px 0;border-bottom:1px solid var(--line)}.concept-glossary dt{font-weight:700;color:#116b59}.concept-glossary dd{margin:0;color:#40534a}.mental-prompt,.misconception{margin-top:20px;padding:20px 22px;background:#fff6e5;border-left:4px solid #d89a37;border-radius:0 12px 12px 0}.mental-prompt p,.misconception p{margin:5px 0 0}.worked-example{counter-reset:worked;list-style:none;padding:0;margin:22px 0}.worked-example>li{position:relative;padding:0 0 20px 45px;counter-increment:worked}.worked-example>li::before{content:counter(worked);position:absolute;left:0;top:2px;width:29px;height:29px;border-radius:50%;background:#e5f0e9;color:#116b59;display:grid;place-items:center;font-size:14px;font-weight:750}.worked-example p{margin:6px 0}.transfer-map{border-top:1px solid var(--line);padding-top:20px;margin-top:22px}.lesson-card .mini-table{grid-template-columns:minmax(100px,.7fr) minmax(0,1.3fr)}.adv-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.adv-shapes{display:block;overflow:auto}.gated.locked>*{filter:none!important;opacity:1!important;pointer-events:auto!important}.gated.locked::after{display:none!important}.gated.locked{user-select:auto}.predict{margin-top:12px}.notebook-guide details summary{padding:12px 0}.notebook-guide details{border-top:1px solid #d2dece}
/* Interactive experiments */
.learning-lab{border:1px solid #b8d4c4;background:#f1f7f1;border-radius:16px;padding:25px;margin:24px 0}.lab-eyebrow{font-size:11px;letter-spacing:.1em;color:#397258;font-weight:700}.learning-lab header h4{font-size:22px;line-height:1.4;margin:8px 0}.learning-lab header p{font-size:14px;margin:0}.lab-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;margin:22px 0}.lab-controls label{display:flex;flex-direction:column;gap:10px;font-size:14px}.lab-controls output{font-size:17px;font-weight:750;color:#116b59;margin-left:6px;font-variant-numeric:tabular-nums}.lab-controls input{width:100%;accent-color:#168267;min-height:28px;margin:0;cursor:ew-resize}.lab-metrics{display:grid;grid-template-columns:repeat(auto-fit,minmax(125px,1fr));gap:10px;margin:18px 0}.lab-metrics>div{padding:14px;background:white;border:1px solid #dae7dd;border-radius:10px}.lab-metrics small{display:block;font-size:12px;color:#53685a;line-height:1.6}.lab-metrics strong{display:block;font-size:25px;line-height:1.6;font-variant-numeric:tabular-nums}.lab-metrics strong span{font-size:11px;font-weight:450}.lab-bars{display:grid;gap:14px;margin:24px 0}.lab-bar>div:first-child{display:flex;justify-content:space-between;gap:12px;font-size:12px}.lab-track{height:9px;background:#dfeadf;border-radius:20px;overflow:hidden;margin-top:5px}.lab-track i{display:block;height:100%;background:#31896b;border-radius:20px;transform-origin:left;animation:bar-enter .35s ease-out}.lab-bar:nth-child(2) i{background:#d09b4c}.lab-bar:nth-child(3) i{background:#6a91ac}.lab-tokens{display:flex;flex-wrap:wrap;gap:7px;margin:24px 0}.lab-token{border:1px solid #c9d8cd;padding:7px 10px;border-radius:8px;background:#fff;font-size:12px;font-weight:650;animation:token-enter .25s ease-out}.lab-token.good{background:#d6eddf;color:#175b3d;border-color:#b0d4bc}.lab-token.bad{background:#f7ded7;color:#8b3d28;border-color:#e8b4a4}.lab-token.idle{background:#ebece7;color:#626b60}.lab-phase-track{background:#dce6db;height:4px;border-radius:6px}.lab-phase-track i{display:block;background:#116b59;height:4px;width:0;transition:width .5s ease}.lab-phase-labels{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:10px 0 18px;font-size:11px;color:#6b7b6d;line-height:1.6}.lab-phase-labels .active{font-weight:750;color:#116b59}.lab-story{background:#fff;border:1px solid #d4e3d6;border-radius:12px;padding:20px;min-height:150px}.lab-story small{font-size:11px;color:#708274}.lab-story h4{margin:5px 0}.lab-story p{font-size:14px;margin:5px 0;line-height:1.85}.lab-actions{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.lab-actions button,.lab-challenge button{background:white;border:1px solid #b5cbb9;border-radius:8px;padding:8px 13px;font-size:13px;color:#234836}.lab-actions [data-play],.lab-challenge button{background:#116b59;border-color:#116b59;color:#fff}.lab-challenge{border-top:1px dashed #c2d7c7;padding-top:18px;margin-top:20px}.lab-challenge label{display:block;font-size:14px;font-weight:650;margin-bottom:10px}.lab-challenge>div{display:flex;flex-wrap:wrap;gap:8px}.lab-challenge input{width:160px;max-width:100%;border:1px solid #abc5b2;border-radius:8px;padding:8px 12px;background:#fff;font-size:14px}.lab-challenge p{font-size:14px;margin:12px 0 0}.lab-challenge [data-correct=true]{color:#116b59}.lab-caption{font-size:11px!important;line-height:1.8!important;color:#5f7363;margin:18px 0 0!important}.factory-entry{margin-bottom:24px}.factory-entry a{max-width:100%}@keyframes bar-enter{from{transform:scaleX(.03)}to{transform:scaleX(1)}}@keyframes token-enter{from{transform:translateY(5px);opacity:.3}to{transform:translateY(0);opacity:1}}
/* Map */
.levels{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.level{padding:22px;box-shadow:none;border:1px solid #dbe3dc;border-radius:14px;background:#fff;transition:transform .2s,border-color .2s}.level:hover{transform:translateY(-3px);border-color:#78a991}.level h2{font-size:19px;line-height:1.5}.level>p{font-size:14px;line-height:1.9;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.start{background:#e7f1e9;color:#116b59;border-color:#cee1d2;font-size:14px}.stats{gap:10px}.stat{box-shadow:none;background:white;border:1px solid var(--line);border-radius:10px;padding:12px 16px}.stat strong{font-size:28px}.toolbar{flex-wrap:wrap;gap:14px;padding:18px 0}.filters{flex-wrap:wrap;gap:7px}.filters button{font-size:13px;padding:9px 14px}.filters button.active{background:#116b59;color:white;border-color:#116b59}.course-search{width:min(480px,100%);border:1px solid #c5d6c8;border-radius:8px;padding:11px 14px!important;background:white}.route-banner{background:#e9eee5;border:1px solid #d7e0d1;border-radius:14px;margin:24px 0;padding:24px!important}.route-banner h2{font-size:21px}.route-banner p{font-size:14px}.route-banner a{color:#116b59;text-decoration:underline}.no-results{padding:24px;border:1px dashed #a8c5b3;text-align:center;color:#52665c;border-radius:12px}
@media(max-width:850px){.hero{grid-template-columns:1fr}.course-overview{padding:16px 20px}.course-overview ol{display:flex;gap:16px;flex-wrap:wrap}.course-overview li{flex:1;min-width:160px;margin:4px 0}.levels{grid-template-columns:repeat(2,minmax(0,1fr))}.hero h1{max-width:unset}.adv-grid.two{grid-template-columns:1fr}}
@media(max-width:540px){.shell{width:calc(100% - 28px);padding-top:10px}.top{margin-bottom:20px;gap:8px;display:flex;flex-wrap:wrap;min-height:52px}.hud{gap:5px}.hud .pill{font-size:10px;padding:4px 7px}.top>a{font-size:13px}.hero{gap:18px}.hero h1{font-size:28px;line-height:1.4}.hero .lead{font-size:15px}.course-overview li{min-width:100%;font-size:13px}.course-subtitle{font-size:12px}.lesson-card{padding:22px 18px;gap:12px}.lesson-card h2{font-size:23px}.lesson-card p,.lesson-card li{font-size:15px}.concept-glossary dl>div{grid-template-columns:1fr;gap:4px;padding:13px 0}.concept-glossary dd{font-size:14px}.worked-example>li{padding-left:38px}.learning-lab{padding:18px 14px;margin:18px -2px}.learning-lab header h4{font-size:20px}.lab-controls{grid-template-columns:1fr;gap:16px}.lab-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.lab-metrics strong{font-size:22px}.lab-phase-labels{grid-template-columns:repeat(2,minmax(0,1fr))}.lab-story{padding:15px;min-height:175px}.lab-actions button{padding:9px 10px;font-size:12px}.lab-bar>div:first-child{font-size:11px}.lab-challenge input{width:125px}.notebook-guide{padding:22px 18px}.shell > .complete{display:block;padding:20px}.shell > .complete>div:last-child{margin-top:18px}.levels{grid-template-columns:1fr}.route-banner{padding:20px!important}.lesson-card .mini-table{grid-template-columns:1fr}.stats{grid-template-columns:repeat(3,minmax(0,1fr))}.stat{padding:10px}.stat strong{font-size:25px}.stat span{font-size:11px}.code-walk pre,.syntax-card pre{padding:15px;font-size:12px}.mental-prompt,.misconception{padding:16px}.hero .meta>.pill:first-child{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}

.level.complete{display:grid;margin:0;padding:22px;align-items:stretch;background:#f1f7ef;border-color:#92b8a1;gap:12px}.level.complete>.chips{margin:0}