*{box-sizing:border-box}body{margin:0;font:16px/1.55 system-ui,sans-serif;background:#f4f6fa;color:#20324b}button,input,textarea{font:inherit}button{cursor:pointer;border:1px solid #ccd5e2;background:white;color:#20324b;padding:8px 13px;border-radius:8px}button:hover{background:#eaf0f6}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #14b8a6;outline-offset:2px}aside{position:fixed;width:260px;height:100vh;background:#122b42;color:#d8e5ef;padding:28px 22px;overflow:auto}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:white;font-size:22px;font-weight:750}.logo{background:#b8f0df;color:#123d39;padding:5px 8px;border-radius:9px}.school{font-size:11px;letter-spacing:2px;margin:18px 0 36px}.course,.eyebrow{font-size:11px;letter-spacing:1.4px;font-weight:750;color:#27756d}aside .course{color:#84c7ba}h2{font-size:16px}nav{display:grid;gap:5px}nav button{text-align:left;background:transparent;border:0;color:#cfdae5;font-size:14px;padding:9px}nav button.active{background:#28465e;color:white}nav button span{display:inline-block;width:28px;color:#8ed5c4}.progress{margin-top:28px;font-size:13px}progress{width:100%;accent-color:#74d3b8}small{display:block;font-size:11px;opacity:.8}main{margin-left:260px;padding:26px 36px;max-width:1550px}header{display:flex;align-items:center;justify-content:space-between;gap:15px;font-size:11px;letter-spacing:1.3px;color:#587086}.intro{display:flex;align-items:center;justify-content:space-between;padding:28px 0 20px}h1{font-size:36px;line-height:1.2;margin:8px 0}.intro p:last-child{color:#62748a;margin:10px 0}.pill{border:1px solid #cbd6e2;border-radius:30px;padding:8px 16px;font-size:13px;white-space:nowrap}.learning{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:22px}article,#guide{background:white;border:1px solid #dce3ec;border-radius:12px;padding:18px 22px}article p{margin:6px 0 12px}.challenge{background:#eaf6f1;border-color:#cde6db}.challenge label{font-size:13px;display:flex;gap:7px;align-items:center}.workspace{display:grid;grid-template-columns:1.2fr 1fr;border:1px solid #d7e0ea;border-radius:12px;overflow:hidden;background:white}.panelhead{display:flex;align-items:center;justify-content:space-between;padding:10px 17px;gap:8px}.panelhead h2{margin:0}.panelhead button{font-size:12px}textarea{width:100%;min-height:340px;resize:vertical;border:0;border-top:1px solid #e5eaf1;padding:20px;font:14px/1.7 ui-monospace,monospace;tab-size:2;background:#fff;color:#20324b}.tools{display:flex;flex-wrap:wrap;gap:7px;padding:12px 16px}.tools button{font-size:12px}.primary{background:#126c61;color:white;border-color:#126c61}.primary:hover{background:#0e564d}.hint{font-size:11px;margin:0;padding:0 16px 15px;color:#62748a}.terminal{background:#172c42;color:#d7e7f6;min-width:0}.terminal .panelhead{border-bottom:1px solid #31485d}.terminal h2{color:white}#status{font-size:12px;color:#97d5c2}pre{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.7 ui-monospace,monospace;padding:18px;margin:0;max-height:380px;overflow:auto;min-height:230px}.error{color:#ffb7ae}form{padding:16px;border-top:1px solid #31485d}form label{font-size:13px}form div{display:flex;gap:8px;margin-top:8px}form input{width:100%;min-width:0;border-radius:7px;border:0;padding:8px}footer{font-size:11px;color:#677b8d;padding:22px 0}a{color:inherit}#guide{margin-bottom:18px}#guide p{font-size:14px}.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}[hidden]{display:none!important}@media(max-width:1050px){aside{width:220px;padding:22px 15px}main{margin-left:220px;padding:22px}.workspace{grid-template-columns:1fr}.terminal pre{min-height:120px}h1{font-size:30px}}@media(max-width:700px){aside{position:static;width:100%;height:auto}.school{margin:12px 0}.course,aside h2,.progress{display:none}nav{display:flex;overflow:auto;margin-top:15px}nav button{white-space:nowrap}main{margin:0;padding:20px}.learning{grid-template-columns:1fr}header{letter-spacing:0}header>span{display:none}.intro{padding-top:18px}h1{font-size:28px}.pill{font-size:11px;padding:6px 10px}}
.exercisebank{background:white;border:1px solid #dce3ec;border-radius:12px;margin-bottom:22px;padding-bottom:14px}.exercisebank .panelhead>span{font-size:12px;color:#62748a}#exercises{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:12px 16px}details{border:1px solid #dce3ec;border-radius:8px;padding:10px 12px;font-size:13px}summary{cursor:pointer}summary span{display:block;font-size:10px;color:#27756d;margin:5px 0 0 15px}details p{margin:12px 0 0;color:#52697c}@media(max-width:700px){#exercises{grid-template-columns:1fr}.exercisebank .panelhead{align-items:flex-start;flex-direction:column}}

#flowpanel{margin-top:22px;padding:16px;background:white;border:1px solid #dce3ec;border-radius:12px}#flowpanel .panelhead{flex-wrap:wrap}#flowstatus{font-size:13px;color:#27756d}#flowdiagram{overflow:auto;max-height:600px;border:1px solid #dce3ec;border-radius:8px;margin:16px 0;background:#fbfcfe}#flowdiagram svg{display:block}#flowdiagram g:focus{outline:2px solid #126c61}.flowblock{margin:10px 0;padding:12px;border:1px solid #dce3ec;border-left:3px solid #88aea6;border-radius:8px;background:#f7f9fc}.flowblock label{display:block;font-size:12px;color:#27756d;margin-bottom:5px}.flowblock input{width:100%;padding:8px;border:1px solid #ccd5e2;border-radius:6px;background:white;margin-bottom:8px}.flowblock button,#flowblocks select{font-size:12px;margin-right:5px;padding:6px 10px}.flowblock p{font-size:12px;font-weight:600}.flowblock .flowblock{background:white}#flowblocks select{max-width:100%}

#flowdiagram svg{width:100%;height:auto}#flowdiagram{min-height:120px}

#flowblocks{border:1px solid #dce3ec;border-radius:10px;overflow:hidden}.flow-palette{display:flex;flex-wrap:wrap;gap:5px;padding:10px;background:#edf3f8}.flow-palette button{font-size:11px;padding:6px 9px;cursor:grab}.flow-palette .chosen{background:#126c61;color:white}.flow-inspector{padding:10px;background:#fff9e9;display:flex;gap:6px;align-items:center;flex-wrap:wrap;position:sticky;top:0;z-index:2}.flow-inspector label{font-size:11px}.flow-inspector input{flex:1;min-width:130px;font:12px ui-monospace,monospace;padding:7px;border:1px solid #ccd5e2;border-radius:6px}.flow-inspector button{font-size:11px;padding:5px 8px}.flow-canvas{max-height:440px;overflow:auto;padding:12px;background:#fafcfe}.flow-visual-block{text-align:center;margin:auto;max-width:560px}.flow-node{display:inline-flex;align-items:center;gap:7px;padding:7px 12px;font:12px ui-monospace,monospace;max-width:100%;background:#eaf6f1;border-color:#88aea6;cursor:grab}.flow-node-text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.flow-visual-block.if>.flow-node{background:#fff2cb;border-color:#dfc071}.flow-visual-block.main>.flow-node,.flow-visual-block.sub>.flow-node{border-radius:24px}.flow-body{padding:0 8px;border-left:2px solid #d1dce6;margin:5px 12px}.flow-branches{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:6px}.flow-branch{min-width:0}.flow-branch small{display:block;color:#27756d;font-size:11px}.flow-drop{display:block!important;margin:4px auto!important;width:26px;height:21px;padding:0!important;border:1px dashed #a8baca;background:white;color:#62748a;line-height:18px;font-size:12px!important}.flow-drop.drag-over{background:#b8f0df;outline:2px solid #126c61;width:80px}.is-dragging .flow-drop{background:#e2f3ee}.flow-preview{margin-top:12px;font-size:12px;padding:10px}.flow-node:focus-visible{outline:3px solid #14b8a6;outline-offset:2px}

.flow-ghost{position:fixed;z-index:9999;pointer-events:none;background:#126c61;color:white;border-radius:8px;padding:8px 12px;font-size:12px;box-shadow:0 3px 12px #122b4230}.flow-palette button,.flow-node{touch-action:none;user-select:none}

.flow-visual-block.if{padding-top:16px}.flow-decision{min-width:100px;min-height:54px;max-width:85%;border:0!important;border-radius:0!important;clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%);padding:14px 24px!important;background:#ffe5a0!important;justify-content:center}.flow-decision>span:first-child{display:none}.flow-branches{position:relative;margin-top:12px;padding:12px 4px 16px;align-items:stretch}.flow-branches:before,.flow-branches:after{content:'';position:absolute;left:25%;right:25%;height:2px;background:#97afbf}.flow-branches:before{top:0}.flow-branches:after{bottom:0}.flow-visual-block.if>.flow-node{position:relative}.flow-branch{position:relative;padding:0 3px;background:linear-gradient(#97afbf,#97afbf) center/2px 100% no-repeat}.flow-branch>small:not(.flow-empty){display:inline-block;position:relative;background:#fafcfe;padding:0 6px;font-weight:700}.flow-branch>.flow-drop,.flow-branch>.flow-visual-block{position:relative;z-index:1}.flow-branch .flow-node{max-width:100%;padding:6px;font-size:11px}.flow-empty{background:#fafcfe;margin:8px 0;padding:4px;font-size:10px!important;color:#62748a!important;position:relative;z-index:1}.flow-join{position:relative;margin-top:-2px;font-size:11px;line-height:15px;color:#587086}.flow-join:before{content:'';display:block;height:10px;width:2px;background:#97afbf;margin:auto}.flow-end{display:inline-block;padding:5px 16px;margin-top:5px;border:1px solid #88aea6;border-radius:22px;background:#eaf6f1;font-size:12px}.flow-canvas .flow-drop{background:#fafcfe}.flow-drop:after{content:'↓';position:absolute;margin-left:7px;color:#97afbf;font-size:10px}
.flow-visual-block.if{background:#fafcfe}.flow-visual-block.if>.flow-branches{margin-top:0;background:linear-gradient(#97afbf,#97afbf) center top/2px 12px no-repeat,linear-gradient(#97afbf,#97afbf) 25% bottom/2px 16px no-repeat,linear-gradient(#97afbf,#97afbf) 75% bottom/2px 16px no-repeat}.flow-visual-block.if>.flow-branches:before{top:12px}

/* Simple condition: true branch on the right, false path straight down. */
.flow-simple-if{display:grid;grid-template-columns:minmax(100px,1fr) minmax(100px,1fr);grid-template-rows:auto auto auto;column-gap:28px;position:relative;padding-top:14px!important;isolation:isolate}
.flow-simple-if>.flow-decision{grid-column:1;grid-row:1;align-self:center;justify-self:center;background:#589bd3!important;color:white;min-width:120px;min-height:68px;font-size:13px;z-index:1}
.flow-simple-if>.flow-branches{display:contents!important}
.flow-simple-if>.flow-branches:before,.flow-simple-if>.flow-branches:after{display:none}
.flow-simple-if>.flow-branches>.flow-branch:first-child{grid-column:2;grid-row:1 / 3;background:linear-gradient(#589bd3,#589bd3) center/2px 100% no-repeat;padding-top:4px;padding-bottom:18px;position:relative}
.flow-simple-if>.flow-branches>.flow-branch:first-child:before{content:'→';position:absolute;right:100%;top:34px;width:28px;line-height:2px;background:#589bd3;color:#589bd3;font-size:22px;text-align:right}
.flow-simple-if>.flow-branches>.flow-branch:first-child>.flow-visual-block>.flow-node{background:#ffcf35;border-color:#d9a900;color:#26364a;border-radius:3px}
.flow-simple-if>.flow-branches>.flow-branch:last-child{grid-column:1;grid-row:2;min-height:55px;background:linear-gradient(#589bd3,#589bd3) center/2px 100% no-repeat}
.flow-simple-if>.flow-branches>.flow-branch:last-child>.flow-empty{display:none}
.flow-simple-if>.flow-join{grid-column:1 / 3;grid-row:3;margin:0 25% 0 25%;height:20px;border-top:2px solid #589bd3;text-align:left;color:#589bd3;position:relative}
.flow-simple-if>.flow-join:before{margin:0;height:18px;background:#589bd3}
.flow-simple-if>.flow-join:after{content:'←';position:absolute;left:-5px;top:-10px;font-size:20px;color:#589bd3}
.flow-simple-if:before{content:'';position:absolute;left:25%;right:25%;top:48px;height:2px;background:#589bd3;z-index:-1}.flow-simple-if>.flow-branches>.flow-branch:first-child:before{width:12px;right:50%;top:34px;background:transparent}.flow-simple-if:after{content:'↓';position:absolute;left:25%;top:0;height:15px;color:#589bd3;border-left:2px solid #589bd3;font-size:14px;line-height:15px}
/* Keep the simple-if entry and exit on the program's central axis. */
.flow-simple-if{grid-template-columns:1fr 1fr 1fr;column-gap:0;max-width:none;padding-top:0!important}
.flow-simple-if>.flow-decision{grid-column:2;min-width:0;width:100%;max-width:100%;min-height:80px;padding:16px 20px!important}
.flow-simple-if>.flow-decision>.flow-node-text{white-space:normal;overflow:visible;text-overflow:clip;overflow-wrap:anywhere;font-size:12px}
.flow-simple-if>.flow-branches>.flow-branch:first-child{grid-column:3;padding-left:8px;padding-right:8px}
.flow-simple-if>.flow-branches>.flow-branch:last-child{grid-column:2}
.flow-simple-if>.flow-join{grid-column:2 / 4;margin-left:25%;margin-right:25%;height:20px}
.flow-simple-if:before{left:50%;right:16.666%;top:40px}
.flow-simple-if:after{display:none}
.flow-simple-if>.flow-branches>.flow-branch:first-child:before{top:40px}
.flow-simple-if>.flow-join:after{content:'';left:0;top:-1px;width:0;height:0}
.flow-simple-if>.flow-join{font-size:0}
.flow-simple-if>.flow-join:before{height:20px}
.flow-simple-if>.flow-branches>.flow-branch:first-child .flow-node-text{white-space:normal;overflow:visible;overflow-wrap:anywhere}
/* Consistent semantic colours and labels on their outgoing paths. */
.flow-visual-block.line>.flow-node{background:#ffcf35!important;border-color:#d9a900!important;color:#26364a;border-radius:9px!important}
.flow-visual-block.if>.flow-node{background:#589bd3!important;color:white;border-color:#397db5!important}
.flow-visual-block.while>.flow-node,.flow-visual-block.for>.flow-node,.flow-visual-block.repeat>.flow-node{background:#9bd8ae!important;border-color:#43885a!important;color:#173b24;border-radius:9px}
.flow-visual-block.main>.flow-node,.flow-visual-block.sub>.flow-node,.flow-end{background:#e4d9f5!important;border-color:#9b7bc2!important;color:#45345d}
.flow-visual-block.comment>.flow-node{background:#e6e9ee!important;border-color:#98a4b2!important;color:#435063}
.flow-simple-if>.flow-branches>.flow-branch:first-child{background-position:center 40px;background-size:2px calc(100% - 40px);padding-top:40px}
.flow-simple-if>.flow-branches>.flow-branch:first-child>small:not(.flow-empty){position:absolute;top:22px;right:52%;padding:0 5px;white-space:nowrap;background:#fafcfe}
.flow-simple-if>.flow-branches>.flow-branch:first-child:before{top:40px}
.flow-simple-if>.flow-branches>.flow-branch:first-child>.flow-visual-block>.flow-node{border-radius:9px!important}

.workspace{grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);align-items:start;overflow:visible}
.workspace>.editor{grid-column:1;grid-row:1;min-width:0}
.workspace>#flowpanel{grid-column:2;grid-row:1;margin:0;padding:12px;border:0;border-left:1px solid #dce3ec;border-radius:0;min-width:0}
.workspace>.terminal{grid-column:1 / -1;grid-row:2;border-radius:0 0 12px 12px}
.workspace .terminal pre{min-height:120px;max-height:280px}
.workspace textarea{min-height:520px}
.workspace #flowpanel>.hint{padding:0 0 10px}
.workspace #flowpanel>.panelhead{padding:0 0 8px}
.workspace #flowpanel .flow-canvas{max-height:480px}
.workspace .editor>.panelhead{flex-wrap:wrap}
.workspace:has(>#flowpanel[hidden])>.editor{grid-column:1 / -1}
@media(max-width:950px){.workspace{grid-template-columns:minmax(0,1fr)}.workspace>#flowpanel{grid-column:1;grid-row:2;border-left:0;border-top:1px solid #dce3ec}.workspace>.terminal{grid-row:3}.workspace textarea{min-height:340px}}

.flow-visual-block.while,.flow-visual-block.for,.flow-visual-block.repeat{position:relative;background:#fafcfe;padding:10px 8px 0}
.flow-visual-block.while>.flow-body,.flow-visual-block.for>.flow-body,.flow-visual-block.repeat>.flow-body{position:relative;border:2px solid #43885a;border-radius:10px;margin:8px 12px 0;padding:8px 22px 10px;background:#f0faf2}
.flow-loop-label{display:block;background:#f0faf2;color:#306741;font-size:10px;font-weight:700;text-align:left;margin-bottom:6px}
.flow-loop-return{font-size:10px;color:#306741;border-top:2px solid #43885a;padding:6px 0 0;margin-top:8px}
.flow-body:has(>.flow-loop-return):after{content:'↑';position:absolute;right:4px;top:0;bottom:18px;width:12px;border-right:2px solid #43885a;color:#306741;font-size:22px;line-height:22px}
.flow-loop-exit{font-size:10px;color:#306741;padding:5px;background:#fafcfe}
.flow-body:has(>.flow-loop-return)>.flow-branch{background:none}
/* Loop return travels down, left and back up to its header. */
.flow-visual-block.while,.flow-visual-block.for,.flow-visual-block.repeat{padding-left:30px;padding-right:30px;position:relative}
.flow-visual-block.while>.flow-body,.flow-visual-block.for>.flow-body,.flow-visual-block.repeat>.flow-body{border:0;border-radius:0;margin:8px 0 0;padding:8px 0 24px;background:#fafcfe;position:static}
.flow-loop-label{background:#fafcfe;text-align:center}
.flow-body:has(>.flow-loop-return):after{display:none}
.flow-loop-return{font-size:0;border:0;margin:0;padding:0;height:0}
.flow-body:has(>.flow-loop-return):before{content:'';position:absolute;left:12px;right:50%;top:24px;bottom:25px;border-left:2px solid #43885a;border-top:2px solid #43885a;border-bottom:2px solid #43885a;border-radius:7px 0 0 7px;pointer-events:none}
.flow-loop-return:after{content:'→';position:absolute;left:calc(50% - 110px);top:12px;color:#43885a;font-size:20px;line-height:24px;background:#fafcfe;padding-left:3px}
.flow-visual-block.while>.flow-node,.flow-visual-block.for>.flow-node,.flow-visual-block.repeat>.flow-node{position:relative;z-index:1;max-width:calc(100% - 4px)}
.flow-loop-exit{position:relative;font-size:10px;padding:5px 0;background:transparent}
.flow-loop-return:after{display:none}
.flow-visual-block.while>.flow-node:before,.flow-visual-block.for>.flow-node:before,.flow-visual-block.repeat>.flow-node:before{content:'→';position:absolute;right:100%;top:50%;transform:translateY(-50%);color:#43885a;font-size:20px;line-height:20px;width:14px;background:#fafcfe}
.flow-body:has(>.flow-loop-return){background:linear-gradient(#43885a,#43885a) center/2px 100% no-repeat}
.flow-body:has(>.flow-loop-return)>.flow-loop-label{position:relative}
/* Continuous sequence connectors after a loop and through insertion slots. */
.flow-body>.flow-branch{background:linear-gradient(#97afbf,#97afbf) center/2px 100% no-repeat}
.flow-loop-exit{background:linear-gradient(#43885a,#43885a) center/2px 100% no-repeat;min-height:34px;padding:8px 0}
.flow-loop-exit:after{content:'↓';display:block;color:#43885a;line-height:12px;font-size:13px}
.flow-visual-block.while,.flow-visual-block.for,.flow-visual-block.repeat{padding-bottom:0}
.flow-loop-exit{text-shadow:2px 0 #fafcfe,-2px 0 #fafcfe,0 2px #fafcfe,0 -2px #fafcfe}
.flow-visual-block.while>.flow-body,.flow-visual-block.for>.flow-body,.flow-visual-block.repeat>.flow-body{background:linear-gradient(#43885a,#43885a) center/2px 100% no-repeat!important}
