@charset "UTF-8";
:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#f5f7f6;background:#315c78;--ink:#344351;--yellow:#ffe173;--green:#7acc86;--blue:#63b5e8;--paper:#fffdf4;--line:#cbd4d8;color-scheme:light}*{box-sizing:border-box}body{margin:0;font-size:14px}button,input,select{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer;background:none;border:0;color:inherit}a{color:inherit;text-decoration:none}button:hover,a:hover{filter:brightness(1.08)}:focus-visible{outline:3px solid #ffe173;outline-offset:3px}[hidden]{display:none!important}.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:absolute;top:-80px;left:15px;background:#fff;padding:12px;color:#222;z-index:20}.skip-link:focus{top:10px}
.game-header{height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 27px;background:#284c63;border-bottom:1px solid #ffffff18;gap:18px}.brand{display:flex;align-items:center;gap:11px;font-size:24px}.brand strong{font-size:22px;letter-spacing:-.8px}.game-header nav{display:flex;gap:6px;align-items:center;font-size:12px}.game-header nav a,.game-header nav button{padding:8px 12px;border-radius:5px}.game-header nav [aria-current]{background:#ffffff17}.scene-label{align-items:center;min-height:29px}.scene-label #levels-button{color:#ffe173;border:1px solid #dfcf724c;border-radius:5px;padding:5px 9px;font-size:11px;letter-spacing:0}.scene-label #save-status{margin-left:auto}.game-world{display:grid;grid-template-columns:minmax(0,1fr) 8px min(var(--terminal-width,340px),50%);column-gap:6px;height:calc(100dvh - 100px);min-height:650px;padding:17px;gap:20px;position:relative;background:radial-gradient(ellipse at 72% 35%,#477590 0,#315c78 65%)}
.console-window{display:flex;flex-direction:column;min-width:0;background:#20272c;border:1px solid #1f353e;border-radius:7px;overflow:hidden;box-shadow:0 5px 18px #14293770}.window-bar{display:flex;align-items:center;gap:14px;background:linear-gradient(#f6f7f5,#cbd1d0);color:#40505a;padding:9px 13px;font-size:12px;min-height:38px;border-bottom:1px solid #aab5b7}.window-bar button{margin-left:auto;font-size:11px;padding:2px 5px}.console-level{padding:16px 17px 10px;display:flex;gap:12px;align-items:center;border-bottom:1px solid #ffffff0b}.console-level>span:first-child{color:#b7e296;background:#394e34;padding:3px 8px;border-radius:3px;font:12px ui-monospace,monospace}.console-level>span:last-child{font-size:10px;color:#91a2a9}.transcript{flex:1;overflow:auto;min-height:120px;padding:17px;font:13px/1.9 ui-monospace,SFMono-Regular,Menlo,Consolas,"PingFang SC",monospace;white-space:pre-wrap;overflow-wrap:anywhere;color:#d2dbd6;scrollbar-width:thin;scrollbar-color:#566165 transparent}.terminal-entry{margin-bottom:17px}.terminal-entry pre{font:inherit;white-space:pre-wrap;margin:0;overflow-wrap:anywhere}.terminal-command{color:#acd883}.terminal-error{color:#efa59d}.terminal-welcome{color:#8a9c9f;font-size:12px}.command-form{display:flex;align-items:center;gap:8px;padding:11px 12px;border-top:1px solid #ffffff12;background:#182024}.command-form>span{color:#9ace77;font:12px ui-monospace,monospace;max-width:37%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.command-form input{font:13px ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:#f0f5e9;border:0;background:none;min-width:0;width:100%;padding:7px 0;outline:none}.command-form input:focus-visible{box-shadow:0 2px #a1c777}.command-form input::placeholder{color:#63747a}.command-form button{background:#475b39;color:#d9e9b6;font-size:15px;border-radius:3px;padding:1px 8px}.console-footer{display:flex;justify-content:space-between;padding:8px 13px;background:#222d31;color:#87999e;font-size:9px}
.scene{position:relative;min-width:0;border-radius:8px;background-image:radial-gradient(#bdd5de25 1px,transparent 1px);background-size:20px 20px;overflow:auto;scrollbar-width:thin}.scene-label{display:flex;justify-content:space-between;padding:3px 10px;color:#bdd5e1;font-size:9px;letter-spacing:2px}.scene-label>span:last-child{letter-spacing:0;color:#a7c5d5}.mission-window{position:relative;z-index:2;width:min(570px,calc(100% - 35px));margin:20px auto 0;background:var(--paper);color:var(--ink);border:2px solid #d4d9d2;border-radius:8px;box-shadow:0 7px 0 #173c5140,0 12px 30px #1a3d5350;transform:rotate(-.3deg)}.mission-bar{display:flex;justify-content:space-between;gap:10px;border-bottom:1px solid #d9ddcf;background:#f0f1e5;padding:8px 17px;font-size:10px;color:#7a8373;border-radius:5px 5px 0 0}.mission-dialogue{display:flex;gap:15px;padding:21px 23px 13px}.guide{width:43px;flex-shrink:0;font-size:37px;transform:rotate(-10deg);padding-top:13px}.guide-name{font-size:10px;color:#a18b48;margin:0 0 7px;font-weight:700}.mission-dialogue h1{font-size:23px;line-height:1.35;margin:0 0 10px;letter-spacing:-.5px;color:#304758}.mission-dialogue #task-context{font-size:13px;line-height:1.8;margin:0;color:#64737c}.mission-target{margin:0 23px 7px;padding:11px 13px;border:1px dashed #c4cfb8;background:#f2f6e9;border-radius:4px;display:flex;align-items:center;justify-content:space-between;gap:10px}.goals{list-style:none;margin:0;padding:0}.goals li{display:flex;gap:8px;align-items:start;font-size:12px;line-height:1.8}.goal-check{margin-top:4px;flex-shrink:0;width:14px;height:14px;border:1px solid #a8b7a0;border-radius:50%;display:grid;place-items:center;line-height:1;color:#46773e}.goals li.done .goal-check{background:#80be71;color:#fff;border-color:#80be71}#task-badge{font-size:9px;white-space:nowrap;color:#8a967a}#task-badge.complete{color:#528044}.mission-actions{display:flex;align-items:center;gap:8px;padding:10px 20px 16px;font-size:11px}.mission-actions>button:first-child{color:#7e7d62}.command-chip{font:11px ui-monospace,monospace;color:#4481ab;border-bottom:1px dotted #82a8c5;padding:4px}.next-button{margin-left:auto;padding:7px 13px;background:#80bb67;border:1px solid #619c4a;border-radius:4px;color:white;box-shadow:0 2px 0 #649d4e;font-size:12px;font-weight:650}.command-explanation{font-size:10px;margin:7px 23px 0;color:#849094}.command-explanation summary{cursor:pointer}.command-explanation p{font-size:11px;line-height:1.8;margin:6px 0;color:#576d78}.hint-box{margin:10px 23px;padding:10px 13px;font-size:11px;background:#fff2c3;border-left:3px solid #e7c351}.hint-box pre{font:11px/1.8 ui-monospace,"PingFang SC",monospace;white-space:pre-wrap;margin:6px 0 0}.hint-box strong{font-size:10px}.scene-controls{display:flex;justify-content:center;gap:14px;margin:24px 0 4px;font-size:10px;color:#b2c9d6;flex-wrap:wrap}.scene-controls button{padding:5px 8px;border-bottom:1px solid transparent}.scene-controls button[aria-pressed=true]{color:#ffe383;border-bottom-color:#ffe383}.files-world{position:relative;padding-top:2px;min-height:240px}.scene-tip{text-align:center;color:#b5cedb;font-size:10px;margin:4px 15px 20px}.file-preview{position:absolute;top:45px;right:18px;width:min(330px,90%);background:#fffdf4;border:1px solid #d1d6cd;border-radius:5px;color:#3c515e;padding:15px;box-shadow:0 10px 30px #14364b70;z-index:4}.file-preview>div{display:flex;justify-content:space-between;align-items:center;gap:10px}.file-preview strong{font:12px ui-monospace,monospace;overflow-wrap:anywhere}.file-preview button{font-size:20px;line-height:1;color:#84959c}.file-preview p{font-size:10px;color:#899496;margin:8px 0}.file-preview pre{font:11px/1.8 ui-monospace,"PingFang SC",monospace;white-space:pre-wrap;overflow-wrap:anywhere;max-height:220px;overflow:auto;margin:0}.system-world{width:min(580px,calc(100% - 35px));margin:20px auto;display:grid;grid-template-columns:1fr 1fr;gap:12px}.system-section{background:#20485f60;border:1px solid #9bc7db40;border-radius:6px;padding:13px}.system-section h3{font-size:10px;color:#adcddd;margin:0 0 7px}.system-row{font:11px/1.8 ui-monospace,monospace;display:flex;justify-content:space-between;gap:10px}.system-row span:last-child{color:#d2e9a6;overflow-wrap:anywhere}.system-caption{grid-column:1/-1;font-size:10px;text-align:center;color:#b4cfde}.victory-stamp{position:absolute;right:24px;top:90px;border:3px solid #bbe89c;width:83px;height:83px;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:37px;line-height:1.1;color:#c4eba8;transform:rotate(13deg);animation:stamp .4s ease-out}.victory-stamp span{font-size:10px;font-weight:700}.game-footer{height:36px;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:0 25px;background:#284c63;font-size:9px;color:#94b5c9}
.levels-dialog{border:1px solid #bfc9c9;border-radius:7px;background:var(--paper);color:var(--ink);width:min(880px,calc(100% - 30px));padding:0;max-height:85dvh;box-shadow:0 15px 60px #102c4580}.levels-dialog::backdrop{background:#102c456b;backdrop-filter:blur(2px)}.levels-dialog .window-bar{position:sticky;top:0;z-index:2}.window-bar h2{font-size:14px;margin:0}.window-bar #levels-close{font-size:21px;line-height:1}.map-intro{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:24px 27px 8px}.map-intro p{font-size:13px;margin:0;color:#7d8b8f}.map-intro>span{font:11px ui-monospace,monospace;color:#699256}progress{display:block;width:calc(100% - 54px);margin:0 27px 17px;height:4px;border:0;background:#e2e6da}progress::-webkit-progress-bar{background:#e2e6da;border-radius:4px}progress::-webkit-progress-value{background:#8bc473;border-radius:4px}progress::-moz-progress-bar{background:#8bc473}.search-box{display:flex;background:#f3f4ee;border:1px solid #d9ded2;border-radius:4px;padding:7px 10px}.search-box input{border:0;background:none;min-width:0;width:100%;color:#3e5765;font-size:12px;padding:3px;outline:none}.search-box:focus-within{border-color:#75a5c1}.levels-dialog>.search-box{margin:0 27px 15px}#chapters{padding:0 27px 20px}.chapter{border-bottom:1px solid #dfe3d5;padding:12px 0}.chapter summary{list-style:none;display:flex;gap:10px;align-items:center;font-weight:700;font-size:14px}.chapter summary::-webkit-details-marker{display:none}.chapter-number{font:11px ui-monospace,monospace;color:#98a591}.chapter ol{list-style:none;margin:14px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:13px}.chapter li{width:115px}.lesson-link{display:flex;flex-direction:column;align-items:center;gap:5px;font-size:10px;text-align:center;line-height:1.5;color:#7e8c93;min-height:78px}.lesson-marker{display:grid;place-items:center;font:700 14px ui-monospace,monospace;width:37px;height:37px;border-radius:50%;background:#a6c4d5;color:white;border:3px solid #c1d5df;box-shadow:0 2px 0 #8baec2}.lesson-link.done .lesson-marker{background:#8fbd71;border-color:#c1d5a5;box-shadow:0 2px 0 #7b9e62}.lesson-link[aria-current] .lesson-marker{background:#ebc457;border-color:#f3dfa1;color:#715922;box-shadow:0 2px 0 #d6b254}.import-label{cursor:pointer;color:#6d8390}.import-label:focus-within{outline:2px solid #77a6c2}
.manual-window{position:absolute;inset:20px 35px 20px 35px;background:var(--paper);color:var(--ink);border:1px solid #b5c5ca;border-radius:7px;box-shadow:0 10px 40px #14324950;overflow:hidden;z-index:6;display:flex;flex-direction:column;max-width:1050px;margin:0 auto}.manual-tools{display:flex;gap:10px;padding:16px 20px;border-bottom:1px solid #dde3d8}.manual-tools .search-box{flex:1}.manual-tools select{border:1px solid #d9ded2;border-radius:4px;background:#f3f4ee;color:#637682;font-size:11px;padding:5px}.manual-tools>button{font-size:11px;color:#8d985d}.manual-layout{display:grid;grid-template-columns:220px minmax(0,1fr);min-height:0;flex:1}.manual-index{overflow:auto;border-right:1px solid #dde3d8;padding:10px;background:#f0f3e9;scrollbar-width:thin}.manual-index button{display:flex;width:100%;align-items:baseline;gap:10px;justify-content:space-between;padding:11px 10px;border-radius:4px;text-align:left;color:#667980;font-size:10px}.manual-index button strong{font:12px ui-monospace,monospace;color:#48728b}.manual-index button[aria-pressed=true]{background:#dbe6db}.manual-index button span{font-size:9px;text-align:right}.manual-detail{padding:28px 33px;overflow:auto;scrollbar-width:thin}.manual-card-header{display:flex;justify-content:space-between;align-items:center;gap:10px}.manual-detail h3{font:700 29px ui-monospace,monospace;color:#3d7393;margin:0}.manual-detail .star-button{font-size:25px;color:#a5a675}.manual-detail .star-button[aria-pressed=true]{color:#d1a241}.summary{font-size:15px;color:#526d7a;margin:8px 0}.practice-badge{font-size:9px;color:#7c9171}.reference-only{color:#9a927c}.manual-detail pre{font:13px/1.8 ui-monospace,"PingFang SC",monospace;white-space:pre-wrap;overflow-wrap:anywhere;background:#eff2e7;padding:12px 15px;border-radius:4px}.manual-detail dl{display:grid;grid-template-columns:minmax(80px,auto) 1fr;gap:8px 17px;font-size:12px;margin:23px 0}.manual-detail dt{font-family:ui-monospace,monospace;color:#477896}.manual-detail dd{margin:0;color:#7b8c92}.note{font-size:11px;line-height:1.9;color:#849499}.example-label{font-size:10px;color:#99a582}.manual-links{display:flex;gap:18px;align-items:center;flex-wrap:wrap;font-size:11px;margin-top:22px;color:#6189a0}.manual-links button{font-size:11px;padding:0}.manual-empty{padding:25px;font-size:12px;color:#8b9c9f}.noscript{position:absolute;left:400px;top:40px;background:#fff;color:#333;padding:15px}
@keyframes node-arrive{from{opacity:0;translate:0 -5px}to{opacity:1;translate:0 0}}@keyframes stamp{from{opacity:0;scale:1.6}to{opacity:1;scale:1}}
@media(min-width:1500px){.game-world{grid-template-columns:minmax(0,1fr) 8px min(var(--terminal-width,375px),50%);column-gap:11px;padding:23px;gap:30px}.mission-window{margin-top:35px}.scene-controls{margin-top:35px}.victory-stamp{right:40px;top:120px}}
@media(max-width:1100px){.game-world{grid-template-columns:minmax(0,1fr) 8px min(var(--terminal-width,290px),50%);column-gap:3px;gap:14px;padding:14px}.mission-dialogue{padding:18px 17px 12px;gap:10px}.guide{font-size:30px;width:35px}.mission-dialogue h1{font-size:21px}.victory-stamp{display:none!important}.game-header{padding:0 18px}.game-header nav a,.game-header nav button{padding:7px 9px}.game-footer{padding:0 18px}}
@media(max-width:780px){.game-header{height:auto;min-height:70px;flex-wrap:wrap;gap:9px;padding:12px 15px}.brand{font-size:20px}.brand strong{font-size:18px}.game-header nav{font-size:11px;gap:2px}.game-header nav a,.game-header nav button{padding:5px 8px}.game-world{height:auto;min-height:0;display:flex;flex-direction:column;padding:12px;gap:16px}.scene{order:0;overflow:visible}.console-window{order:1;height:340px}.scene-label{padding-top:2px;font-size:8px}.mission-window{width:calc(100% - 8px);margin-top:12px}.mission-dialogue{padding:17px 16px 9px}.mission-dialogue h1{font-size:21px}.mission-dialogue #task-context{font-size:12px}.mission-target{margin:0 16px 6px;padding:9px 10px}.mission-actions{padding:9px 16px 13px}.command-explanation{margin:7px 16px 0}.hint-box{margin:10px 16px}.scene-controls{margin-top:18px;font-size:9px;gap:8px}.scene-tip{font-size:9px;margin-bottom:0}.console-level{padding:11px 13px}.transcript{padding:13px;font-size:12px}.game-footer{height:auto;flex-wrap:wrap;gap:9px;padding:13px;font-size:8px}.game-footer span:nth-child(2){display:none}.manual-window{position:relative;inset:auto;order:0;width:100%;height:76dvh;margin:0;min-height:450px}.manual-layout{grid-template-columns:125px minmax(0,1fr)}.manual-index button{display:block;padding:10px 5px}.manual-index button span{display:block;text-align:left;margin-top:4px}.manual-detail{padding:20px 17px}.manual-detail h3{font-size:23px}.manual-detail pre{font-size:11px;padding:10px}.manual-detail dl{display:block;font-size:11px}.manual-detail dd{margin:3px 0 9px}.manual-tools{padding:12px 10px;gap:6px}.manual-tools select{max-width:95px;font-size:10px}.manual-tools>button{font-size:10px;white-space:nowrap}.levels-dialog{max-height:88dvh}.map-intro{margin:20px 17px 10px}.map-intro p{font-size:11px}#chapters{padding:0 17px 15px}.chapter li{width:80px}.chapter ol{gap:12px 6px}.lesson-link{font-size:9px}.system-world{grid-template-columns:1fr 1fr;gap:8px;width:100%}.system-section{padding:9px}.system-row{font-size:9px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;scroll-behavior:auto!important}}
.scene-label{justify-content:flex-end}.goal-path{display:block;font:10px/1.6 ui-monospace,SFMono-Regular,Menlo,monospace;color:#71806f;margin-top:2px}.map-intro{justify-content:flex-end}
@keyframes node-arrive{from{translate:0 -6px}to{translate:0 0}}@keyframes stamp{from{scale:1.35}to{scale:1}}

.game-world{column-gap:6px}#terminal-resize{cursor:col-resize;touch-action:none;align-self:stretch;display:flex;align-items:center;justify-content:center;border-radius:5px}#terminal-resize::after{content:"";width:3px;height:40px;border-radius:3px;background:#bfd5e04d}#terminal-resize:hover::after,#terminal-resize:focus-visible::after,.terminal-resizing #terminal-resize::after{background:#ffe173}.terminal-resizing,.terminal-resizing *{cursor:col-resize!important;user-select:none!important}.manual-mode #terminal-resize{display:none}
@media(min-width:1500px){.game-world{column-gap:11px}}@media(max-width:1100px){.game-world{column-gap:3px}}@media(max-width:780px){#terminal-resize{display:none}}

/* Finder-style icon browser. */
.files-world{width:min(640px,calc(100% - 35px));margin:15px auto 25px;padding:0;min-height:260px;background:#f8fafc;border:1px solid #d6e0e6;border-radius:8px;box-shadow:0 6px 20px #18374830;color:#41525f;overflow:hidden}
.finder-toolbar{display:flex;align-items:center;gap:14px;padding:12px 15px;background:linear-gradient(#f4f6f8,#e7ecf0);border-bottom:1px solid #d9e0e6;min-width:0}.finder-toolbar button{font-size:11px;color:#6a7986;white-space:nowrap}.finder-toolbar button:disabled{opacity:.35;cursor:default}.finder-toolbar code{font:11px ui-monospace,SFMono-Regular,Menlo,monospace;color:#647583;overflow-wrap:anywhere}
.finder-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(95px,1fr));align-content:start;gap:16px 12px;padding:24px 20px;min-height:215px;max-height:420px;overflow:auto;scrollbar-width:thin}
.finder-item{position:relative;display:flex;flex-direction:column;align-items:center;gap:5px;border-radius:6px;padding:7px 5px;min-width:0;color:#3b4c5a}.finder-item:hover{background:#e6eff7;filter:none}.finder-item.selected{background:#d9eafb}.finder-item.changed{background:#e6f1e7}.finder-icon{display:block;width:74px;height:66px;filter:drop-shadow(0 2px 1px #27425a15)}
.finder-name{font:11px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;text-align:center;overflow-wrap:anywhere;max-width:100%;padding:1px 4px;border-radius:3px}.finder-item.selected .finder-name{background:#3785c8;color:white}.finder-file-tag{position:absolute;top:56px;left:50%;transform:translateX(-50%);font:700 8px ui-monospace,monospace;color:#8394a2;z-index:1}.finder-current{font-size:8px;color:#7b8e9b}
.finder-status{padding:8px 15px;border-top:1px solid #e0e6eb;background:#edf1f4;text-align:center;font-size:9px;color:#8796a1}.finder-empty{grid-column:1/-1;align-self:center;text-align:center;font-size:12px;color:#a0aeb9;margin:45px 0}
.files-world .file-preview{position:relative;top:auto;right:auto;width:auto;margin:0 15px 15px;background:#fff;border-color:#dce4eb;box-shadow:0 3px 10px #203e5210}.files-world .file-preview p{color:#8796a1}
@media(max-width:780px){.files-world{width:calc(100% - 8px);margin:12px auto 5px}.finder-grid{padding:18px 12px;gap:12px 8px;grid-template-columns:repeat(auto-fill,minmax(80px,1fr));min-height:180px}.finder-icon{width:64px;height:58px}.finder-file-tag{top:50px;font-size:7px}.finder-name{font-size:10px}.finder-toolbar{padding:10px 12px}.finder-toolbar code{font-size:10px}}

#terminal-resize:focus-visible{outline:none;outline-offset:0}

.finder-body{display:grid;grid-template-columns:150px minmax(0,1fr)}.finder-tree{background:#edf1f5;border-right:1px solid #d9e0e6;padding:12px 6px;max-height:420px;overflow:auto;font-size:11px;scrollbar-width:thin}.directory-branch summary{display:flex;align-items:center;list-style:none;cursor:pointer}.directory-branch summary::-webkit-details-marker{display:none}.directory-branch summary::before{content:'▸';width:13px;flex-shrink:0;color:#8a99a5}.directory-branch[open]>summary::before{content:'▾'}.directory-children{padding-left:12px}.directory-leaf{padding-left:13px}.directory-link{display:flex;align-items:center;gap:5px;text-align:left;padding:6px 4px;min-width:0;width:100%;border-radius:4px;white-space:nowrap;color:#607180;font-size:11px}.directory-link::before{content:'';width:13px;height:10px;flex-shrink:0;border-radius:2px;background:#85cdef;border-top:3px solid #64b9e2}.directory-link:hover{background:#dfe8f0;filter:none}.directory-link[aria-current]{background:#d2e4f4;color:#286695}.directory-link.working-directory{font-weight:600}.finder-body .finder-grid{min-width:0}
@media(max-width:780px){.finder-body{grid-template-columns:115px minmax(0,1fr)}.finder-tree{padding:10px 4px}.directory-link{font-size:10px}.directory-children{padding-left:9px}}

.practice-actions{grid-column:1/-1;display:flex;align-items:center;justify-content:center;gap:10px}.practice-actions button{padding:7px 15px;border:1px solid #abc8d34a;border-radius:5px;color:#d6e4ec;font-size:11px;background:#284c634d}.practice-actions button:disabled{opacity:.35;cursor:default}.game-world{grid-template-rows:minmax(0,1fr) auto}.scene,.console-window{min-height:0}@media(max-width:780px){.practice-actions{order:2;width:100%}}

/* Compact file browser with an integrated preview pane. */
.files-world{background:#fff;border-color:#d0dde5;border-radius:10px;box-shadow:0 8px 24px #17364b26;min-height:0}.finder-toolbar{padding:10px 14px;gap:12px;background:#f6f8fa;min-height:43px}.finder-toolbar button{padding:5px 8px;border-radius:5px;background:#e9eef2;color:#64798a}.finder-toolbar button:hover{background:#dfe8ef}.finder-toolbar code{color:#3e5b70;font-weight:500}.finder-body{grid-template-columns:145px minmax(0,1fr);min-height:260px}.finder-tree{background:#f0f4f7;padding:10px 7px;max-height:360px}.directory-link{padding:5px 5px;gap:6px;font-size:10px;overflow:hidden;text-overflow:ellipsis}.directory-link::before{width:14px;height:11px;border:0;clip-path:polygon(0 0,42% 0,52% 20%,100% 20%,100% 100%,0 100%);background:linear-gradient(#69bde5 0 28%,#9bd8f2 28%);border-radius:2px}.directory-link[aria-current]{background:#dce9f3;color:#315e7e;box-shadow:inset 0 0 0 1px #cadfeb}.directory-branch summary::before{width:11px;font-size:9px}.directory-leaf{padding-left:11px}.directory-children{padding-left:10px}.finder-content{min-width:0;display:flex;flex-direction:column;background:#fff}.finder-content .finder-grid{grid-template-columns:repeat(auto-fill,82px);gap:10px 14px;padding:18px;min-height:150px;max-height:300px;flex:1}.finder-item{padding:5px 3px;gap:3px;align-self:start;border-radius:6px}.finder-icon{width:62px;height:56px}.finder-name{font-size:10px;line-height:1.5;padding:2px 5px}.finder-file-tag{top:45px;font-size:7px}.finder-item:hover{background:#f1f6fa}.finder-item.selected{background:#edf4fb}.finder-item.selected .finder-name{background:#dbeafa;color:#2d6089}.finder-item.changed{background:#f0f7ee}.finder-item.selected.changed{background:#edf4fb}.files-world .file-preview{margin:0;padding:13px 18px;background:#fafcfd;border:0;border-top:1px solid #e5edf2;border-radius:0;box-shadow:none;z-index:auto}.file-preview strong{font:600 11px -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#486477}.file-preview button{font-size:17px;padding:3px;border-radius:4px}.file-preview button:hover{background:#e7eef3}.file-preview p{font-size:9px;margin:6px 0 10px}.file-preview pre{font-size:11px;max-height:150px;color:#4a6070}.finder-status{padding:7px 14px;background:#f7f9fb;text-align:right;border-top-color:#e4ebf0;font-size:9px}.finder-empty{margin:35px 0;grid-column:1/-1}
@media(max-width:780px){.finder-body{grid-template-columns:110px minmax(0,1fr);min-height:235px}.finder-tree{padding:9px 4px}.directory-children{padding-left:7px}.directory-link{font-size:9px;gap:4px}.finder-content .finder-grid{grid-template-columns:repeat(auto-fill,70px);padding:12px;gap:8px}.finder-icon{width:56px;height:50px}.finder-file-tag{top:41px}.files-world .file-preview{padding:12px}.finder-toolbar{padding:8px 10px}}

/* Let desktop panels share the available workspace. */
@media(min-width:1200px){
  .game-world{grid-template-columns:minmax(0,1fr) 8px min(var(--terminal-width,clamp(375px,32vw,600px)),50%);max-width:1800px;margin:0 auto;padding:20px;column-gap:10px;row-gap:14px}
  .scene{display:flex;flex-direction:column;padding:0 8px}
  .scene-label{padding:0 2px;min-height:29px;flex-shrink:0}
  .mission-window{width:100%;margin:12px 0 0;transform:none;flex-shrink:0}
  .mission-dialogue{padding:18px 23px 10px}.mission-dialogue h1{margin-bottom:5px}
  .scene-controls{justify-content:flex-start;margin:20px 0 8px;gap:12px;flex-shrink:0}
  .files-world{width:100%;margin:0 0 4px;flex:1;display:flex;flex-direction:column;min-height:260px}
  .finder-body{flex:1;min-height:0;overflow:hidden;grid-template-columns:170px minmax(0,1fr)}
  .finder-tree{max-height:none;min-height:0}.finder-content{min-height:0}
  .finder-content .finder-grid{max-height:none;min-height:0;grid-template-columns:repeat(auto-fill,90px);gap:14px 18px;padding:22px;overflow:auto}
  .finder-toolbar,.finder-status{flex-shrink:0}.files-world .file-preview{flex-shrink:0}
  .system-world{width:100%;margin:0 0 4px;grid-template-columns:repeat(3,minmax(0,1fr));align-content:start}
  .victory-stamp{display:none!important}
}

.finder-body{grid-template-columns:clamp(90px,var(--directory-width,145px),50%) 6px minmax(0,1fr)}.finder-tree{border-right:0}.file-resize{display:flex;align-items:center;justify-content:center;touch-action:none;flex-shrink:0;outline:none}.file-resize::after{content:'';background:#a7bbc97a;border-radius:3px}.file-resize:hover::after,.file-resize:focus-visible::after,.file-resize.dragging::after{background:#67b5df}.file-resize.vertical{cursor:col-resize;background:#f0f4f7}.file-resize.vertical::after{width:2px;height:28px}.file-resize.horizontal{height:9px;cursor:row-resize;background:#f7f9fb}.file-resize.horizontal::after{width:30px;height:2px}.file-resize:focus-visible{outline:none;outline-offset:0}.files-world.user-sized{height:var(--files-height);flex:none;display:flex;flex-direction:column;min-height:220px}.user-sized .finder-body{flex:1;min-height:0;overflow:hidden}.user-sized .finder-tree{max-height:none;min-height:0}.user-sized .finder-content{min-height:0}.user-sized .finder-grid{min-height:0;max-height:none;overflow:auto}.user-sized .file-preview{flex-shrink:0;max-height:45%;overflow:auto}.files-resizing,.files-resizing *{cursor:row-resize!important;user-select:none!important}.directory-resizing,.directory-resizing *{cursor:col-resize!important;user-select:none!important}
@media(min-width:1200px){.finder-body{grid-template-columns:clamp(90px,var(--directory-width,170px),50%) 6px minmax(0,1fr)}}
@media(max-width:780px){.finder-body{grid-template-columns:clamp(90px,var(--directory-width,110px),50%) 6px minmax(0,1fr)}}

.files-world .file-preview{position:relative;padding-top:18px;display:flex;flex-direction:column;min-height:85px;flex-shrink:0}.files-world #preview-resize{position:absolute;top:0;left:0;right:0;height:10px;background:transparent;display:flex;justify-content:center;align-items:center}.files-world .file-preview.user-sized-preview{height:var(--preview-height);max-height:none;overflow:hidden}.file-preview.user-sized-preview>div:not(.file-resize),.file-preview.user-sized-preview p{flex-shrink:0}.file-preview.user-sized-preview pre{flex:1;min-height:0;max-height:none;overflow:auto}

.help-dialog{width:min(420px,calc(100% - 30px));padding:0;border:1px solid #bfc9c9;border-radius:8px;background:var(--paper);color:var(--ink);box-shadow:0 15px 60px #102c4580}.help-dialog::backdrop{background:#102c456b;backdrop-filter:blur(2px)}.help-dialog #help-close{font-size:21px;line-height:1}.help-content{padding:20px 23px}.help-content dl{display:grid;grid-template-columns:60px 1fr;gap:16px 12px;margin:0 0 20px;font-size:12px;line-height:1.7}.help-content dt{color:#3d789b}.help-content dd{margin:0;color:#576b77}.help-content p{font-size:11px;line-height:1.8;margin:8px 0 0}.help-content .help-note{font-size:10px;color:#87959c}.practice-actions{flex-wrap:wrap}

.lesson-link{position:relative}.lesson-command-tooltip{position:absolute;bottom:calc(100% + 6px);left:50%;transform:translateX(-50%);padding:6px 9px;border-radius:5px;background:#344e60;color:#f4f8fb;font:11px/1.5 ui-monospace,"PingFang SC",monospace;white-space:nowrap;box-shadow:0 3px 10px #1f3a4926;pointer-events:none;opacity:0;visibility:hidden;z-index:5}.lesson-command-tooltip::after{content:'';position:absolute;top:100%;left:50%;margin-left:-4px;border:4px solid transparent;border-top-color:#344e60}.lesson-link:hover .lesson-command-tooltip,.lesson-link:focus-visible .lesson-command-tooltip{opacity:1;visibility:visible}

/* Linux workspace backdrop. */
:root{background:#1e3443}body{background:#1e3443 url('./linux-background.svg') center 64px / cover fixed no-repeat}.game-world{background:transparent}.scene{background-image:none}.game-header{background:#203747;border-bottom-color:#adc9d51a}.game-footer{background:#203747;color:#93adbd}

body{background-image:url('./linux-penguin.svg'),url('./linux-background.svg');background-position:36px calc(100% - 80px),center 64px;background-size:180px auto,cover;background-attachment:fixed,fixed;background-repeat:no-repeat,no-repeat}

/* Warm graphite palette. */
:root{background:#343632}body{background-color:#343632}.game-header,.game-footer{background:#2c2f2b}.game-header{border-bottom-color:#d6dece1a}

.level-tabs{display:flex;gap:6px;margin:20px 27px 0;padding:4px;background:#edf0e5;border-radius:6px}.level-tabs button{flex:1;padding:9px 12px;color:#7c897e;font-size:12px;border-radius:4px}.level-tabs button[aria-pressed=true]{background:#fffdf4;color:#3e6278;box-shadow:0 1px 4px #31465615;font-weight:600}.levels-dialog .map-intro{margin-top:13px}.manual-tools select{max-width:105px}@media(max-width:780px){.level-tabs{margin:15px 17px 0}.manual-tools{flex-wrap:wrap}.manual-tools .search-box{flex-basis:100%}.manual-tools select{max-width:none}}

.backup-actions{display:flex;gap:12px;margin-top:17px;align-items:center;font-size:11px}.backup-actions button,.backup-actions .import-label{padding:8px 12px;border:1px solid #d5dfd6;border-radius:5px;color:#4c7287;background:#f1f4ed}.backup-actions .import-label:focus-within{outline:3px solid #7cacc4;outline-offset:2px}

.backup-actions{flex-wrap:wrap}.backup-actions #restart-practice{color:#936555;background:#f7f0e8;border-color:#e5d8cb}.help-content .restart-backup-note{padding:10px 12px;background:#f4f0dc;border-radius:5px;color:#7d704d;margin-top:14px}.restart-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px;justify-content:flex-end}.restart-actions button{padding:8px 11px;border:1px solid #d5dfd6;border-radius:5px;font-size:11px;color:#567283}.restart-actions .restart-danger{background:#9d5e4d;border-color:#9d5e4d;color:#fff}

.welcome-dialog{width:min(440px,calc(100% - 30px))}.welcome-content{padding:30px;text-align:center}.welcome-cheese{font-size:42px;margin-bottom:14px}.welcome-content h2{font-size:22px;margin:0 0 16px;color:var(--ink)}.welcome-content p{font-size:13px;line-height:1.9;color:#667985;margin:10px 0}.welcome-content #welcome-start{display:block;width:100%;margin-top:26px;padding:12px 20px;border:1px solid #bc993d;border-radius:6px;background:#efce70;color:#4e4127;font-size:14px;font-weight:650;box-shadow:0 2px 0 #bc993d}.welcome-content #welcome-start:hover{background:#f5d984}.welcome-content #welcome-start:active{transform:translateY(1px);box-shadow:none}

.game-footer nav{display:flex;gap:18px;font-size:11px}.game-footer nav a{color:inherit}.game-footer nav a:hover{text-decoration:underline}

.task-feedback{display:flex;align-items:center;gap:14px;margin:14px 23px;padding:17px 18px;border:1px solid;border-radius:8px;box-shadow:0 3px 10px #30443512}.task-feedback.success{background:#e9f5d8;border-color:#9ebf71;color:#395e2a}.task-feedback.retry{background:#fff1d7;border-color:#d4af6d;color:#805928}.feedback-icon{display:grid;place-items:center;flex-shrink:0;width:42px;height:42px;border-radius:50%;font-size:27px;background:#ffffff9c}.task-feedback strong{font-size:18px;line-height:1.5}.task-feedback p{font-size:12px;line-height:1.7;margin:4px 0 0;overflow-wrap:anywhere}.task-feedback.success .feedback-icon{color:#a98522;background:#ffec9e;box-shadow:0 0 0 5px #ffec9e50}@media(max-width:780px){.task-feedback{margin:12px 16px;padding:14px}.task-feedback strong{font-size:17px}}

.lesson-navigation{display:flex;gap:8px;padding-right:14px;border-right:1px solid #a9b6a54a}.practice-actions .lesson-navigation button{border-color:#dcc56f70;color:#ecd894}.practice-actions button:not(:disabled):hover{background:#ffffff12}@media(max-width:480px){.lesson-navigation{padding-right:0;border-right:0;justify-content:center;width:100%}}
.mastery-badge{display:inline-block;font-size:11px;padding:3px 8px;border-radius:12px;color:#477244;background:#e7efdd}.learning-dialog{width:min(680px,92vw)}.learning-dialog .help-content{display:grid;gap:20px}.learning-dialog h3,.transfer-dialog h3{margin:0 0 10px;font-size:15px}.review-entry{padding:18px;border-radius:8px;background:#eaf0de}.review-entry p{margin:0 0 12px}.quiz-topics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.quiz-topics button{text-align:left;padding:10px}.quiz-topics button:disabled{opacity:.45;cursor:default}.mastery-records summary{cursor:pointer;font-weight:600}.mastery-records ul{list-style:none;padding:0;max-height:260px;overflow:auto}.mastery-records li{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:8px 0;border-bottom:1px solid #dce2d5;font-size:12px}.mastery-state{flex-shrink:0;color:#63824c}.transfer-dialog{width:min(720px,92vw)}.transfer-dialog pre{padding:14px;background:#edf0e8;border-radius:6px;white-space:pre-wrap;overflow-wrap:anywhere;font-size:12px;color:#354939}.transfer-dialog select{font:inherit;max-width:100%;padding:5px;background:#fff;border:1px solid #dce2d5;border-radius:4px}.transfer-dialog details{margin:20px 0}.transfer-done{display:flex;align-items:center;gap:8px}.scene-label #learning-button{margin-left:8px}#review-count:not(:empty){background:#f7dd78;color:#4f542b;border-radius:10px;padding:1px 6px;font-size:11px}.mission-actions{flex-wrap:wrap}@media(max-width:480px){.quiz-topics{grid-template-columns:1fr}.scene-label{flex-wrap:wrap}.mastery-records li{align-items:start}}
.game-world.review-mode{grid-template-columns:minmax(0,1fr)}.review-screen{grid-column:1/-1;width:min(1000px,100%);justify-self:center;overflow:auto;min-height:0;padding:30px 36px;background:var(--paper);border:1px solid #d4d9d2;border-radius:10px;color:var(--ink);box-shadow:0 12px 30px #102c4530}.review-screen:focus{outline:none}.review-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:25px}.review-heading h1{font-size:27px;margin:4px 0 8px}.review-eyebrow{font:10px ui-monospace,monospace;letter-spacing:2px;color:#87967b}.review-heading #learning-summary{font-size:12px;color:#6e7b72}.review-heading>a{font-size:12px;color:#477e8b}.review-screen .review-entry{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.review-screen h2{font-size:15px;margin:0 0 8px}.review-screen #review-status{font-size:12px;color:#71816c;margin:0}.review-screen button{border:1px solid #c7d4b4;border-radius:6px;background:#dae9c7;color:#4d6b3a;padding:9px 14px;font-size:12px;cursor:pointer}.review-screen button:disabled{opacity:.45;cursor:default}.review-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-bottom:24px}.review-card{display:flex;justify-content:space-between;align-items:center;gap:18px;border:1px solid #e0e4d6;border-radius:7px;padding:16px;background:#fffdf7}.review-card .mastery-state{font-size:11px}.review-card button{white-space:nowrap;background:#f0f5e8}.review-screen .help-note{font-size:11px;color:#7f8d7c}.review-screen .mastery-records{padding-top:18px;border-top:1px solid #dce2d5}.review-screen .mastery-records ul{max-height:360px}.practice-actions #review-button{border-color:#afc38480;color:#e6eacb}.practice-actions #review-button[aria-current=page]{background:#718f453b;border-color:#b6d581}.chapter li.boss-level{width:135px}.boss-link{width:100%;border:0;background:transparent;padding:0;cursor:pointer;min-height:95px;gap:4px}.boss-marker{display:grid;place-items:center;width:46px;height:46px;font-size:22px;background:#d6c8e8;color:#634384;border:3px solid #bda1d4;clip-path:polygon(25% 0,75% 0,100% 50%,75% 100%,25% 100%,0 50%)}.boss-link strong{font-size:11px;color:#816291}.boss-status{font-size:10px}.boss-link.locked .boss-marker{filter:grayscale(.8);opacity:.5}.boss-link.available .boss-marker{background:#ffecbb;border-color:#dcb86c}.boss-link.available strong,.boss-link.available .boss-status{color:#9c762c}.boss-link.beaten .boss-marker{background:#dbe9c7;border-color:#94b676}.boss-link.beaten .boss-status{color:#658446}.boss-link.available:hover .boss-marker,.boss-link.available:focus-visible .boss-marker{transform:scale(1.12)}.boss-link:focus-visible{outline:2px solid #dcb86c;outline-offset:5px;border-radius:6px}.boss-requirements{text-align:center;font-size:9px;color:#97a08d;margin-top:5px}.chapter .boss-requirements summary{display:block;font-size:9px;font-weight:400;cursor:pointer}.chapter .boss-requirements ul{padding:8px 0 0;list-style:none;margin:0}.chapter .boss-requirements li{font-size:9px;width:auto;padding:3px 0;text-align:left}.boss-requirements a{color:#748572}.boss-link.available .boss-status{padding:1px 7px;border-radius:8px;background:#f9ecc7}@media(prefers-reduced-motion:no-preference){.boss-link.available:not(.beaten) .boss-marker{animation:boss-glow 2.4s ease-in-out infinite}@keyframes boss-glow{50%{background:#ffdf88;border-color:#c99e43}}}@media(max-width:780px){.review-screen{padding:22px 18px;overflow:visible}.review-list{grid-template-columns:1fr}.review-heading{align-items:flex-start}.review-heading h1{font-size:23px}.chapter li.boss-level{width:100px}.review-heading>a{white-space:nowrap}}

.task-context{margin:0 23px 13px;font-size:13px;line-height:1.7;color:#56656d;overflow-wrap:anywhere}.goal-reference{margin:2px 0 5px}.goal-reference summary{font-size:10px;color:#748367;cursor:pointer}.goal-reference pre{margin:5px 0;padding:8px 10px;background:#fff9;border:1px solid #d9dfd0;border-radius:4px;font:11px/1.6 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap;overflow-wrap:anywhere}.goals li>.goal-copy{min-width:0;overflow-wrap:anywhere}

/* Optional feedback and post-completion explanations. */
.goal-difference{margin:5px 0;color:#966d38;font-size:11px}.goal-difference summary{cursor:pointer;line-height:1.6}.goal-comparison{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:7px}.goal-comparison>div{min-width:0}.goal-comparison strong{font-size:10px;color:#7d8173}.goal-comparison pre{margin:4px 0;padding:8px;background:#fff9;border:1px solid #e3dccb;border-radius:5px;font:11px/1.6 ui-monospace,monospace;white-space:pre-wrap;overflow-wrap:anywhere;max-height:160px;overflow:auto}
.solution-review{margin:12px 23px;color:#596956;font-size:12px}.solution-review>summary{cursor:pointer;color:#527248}.solution-review h3{font-size:12px;margin:16px 0 8px}.solution-review pre{font:11px/1.7 ui-monospace,monospace;white-space:pre-wrap;overflow-wrap:anywhere;background:#f2f4e9;border-radius:5px;padding:10px;margin:5px 0;max-height:180px;overflow:auto}.command-parts{display:grid;grid-template-columns:minmax(70px,1fr) minmax(0,3fr);gap:7px 14px;font-size:11px;line-height:1.7}.command-parts dt{overflow-wrap:anywhere;font-family:ui-monospace,monospace}.command-parts dd{margin:0;overflow-wrap:anywhere}.command-parts a{color:#4d7c93;text-decoration:underline}.solution-example p{margin:12px 0 4px;font-size:10px;color:#85907a}#solution-review-content{max-height:230px;overflow:auto;scrollbar-width:thin;padding-right:5px}.level-tabs button{white-space:nowrap;padding-left:8px;padding-right:8px}@media(max-width:780px){.solution-review{margin:12px 16px}.goal-comparison{grid-template-columns:1fr}#solution-review-content{max-height:280px}.level-tabs{gap:2px}.level-tabs button{font-size:11px;padding:8px 4px}}