/* Shared production shell. The subject engines and their original storage remain intact. */
:root{color-scheme:light;--bg:#f6f9fc;--card:#fff;--ink:#182b49;--ink2:#42566e;--ink3:#627389;--line:#e3e8ef;--purple:#594bdb;--purple-soft:#efedff;--purple-mid:#c4bff3;--green:#13794a;--green-soft:#edf7f1;--studio-side:220px;--studio-bar:72px}
html{font-size:16px!important;scroll-padding-top:90px}body{font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;background:var(--bg)}
.studio-sidebar{position:fixed;inset:0 auto 0 0;width:var(--studio-side);padding:28px 16px 20px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:25}
.studio-brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;padding:0 6px 28px;font-size:20px;font-weight:650;letter-spacing:-.6px;white-space:nowrap}
.studio-brand img{width:36px;height:36px;object-fit:contain;background:#171923;border-radius:10px;padding:2px}
.studio-nav{display:flex;flex-direction:column;gap:6px}.studio-nav a{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink2);min-height:48px;border-radius:8px;padding:12px;font-size:14px;font-weight:550}.studio-nav a:hover{background:var(--bg)}.studio-nav a[aria-current=page]{background:var(--purple-soft);color:var(--purple)}.studio-nav .studio-letter{font-size:16px;font-weight:650;width:24px;text-align:center;flex:none}
.studio-navlabel{padding:4px 12px 12px;font-size:12px;color:var(--ink3)}.studio-sidefoot{margin-top:auto;padding:20px 12px 0;border-top:1px solid var(--line);font-size:14px;color:var(--ink3)}.studio-sidefoot a{display:block;color:inherit;text-decoration:none;min-height:44px;padding:10px 0}
.studio-top{margin-left:var(--studio-side);height:var(--studio-bar);position:sticky;top:0;z-index:20;background:#ffffffed;backdrop-filter:blur(8px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 32px;font-size:14px;color:var(--ink3)}.studio-crumb{display:flex;align-items:center;gap:12px;min-width:0}.studio-crumb strong{color:var(--ink);font-weight:550}.studio-crumb span{white-space:nowrap}.studio-actions{display:flex;gap:8px;align-items:center}.studio-actions button{min-height:44px;border:1px solid var(--line);background:white;padding:10px 14px;border-radius:8px;font-size:14px;color:var(--ink2);white-space:nowrap}.studio-actions #studio-notebook{background:#243853;color:#fff;border-color:#243853}
body.studio-ready #app,body.studio-ready #studio-hub{max-width:1120px;margin-left:calc(var(--studio-side) + max(0px,(100vw - var(--studio-side) - 1120px)/2));margin-right:auto;padding:36px 32px calc(48px + env(safe-area-inset-bottom));width:calc(100% - var(--studio-side))}
body.studio-ready.kbpad #app{padding-bottom:calc(180px + env(safe-area-inset-bottom))}
body.studio-ready #app h1{font-size:32px;line-height:1.3;letter-spacing:-.7px;font-weight:650}body.studio-ready #app h2{font-size:20px;font-weight:600}body.studio-ready #app h3{font-size:18px;font-weight:600}
body.studio-ready #app .q,body.studio-ready #app .gq,body.studio-ready #app .problem-side .q{font-size:20px;line-height:1.75;font-weight:500;letter-spacing:-.2px}
body.studio-ready #app .model{font-size:20px;line-height:1.8}body.studio-ready #app .daytitle{font-size:20px;line-height:1.45;font-weight:600}body.studio-ready #app .daymeta,body.studio-ready #app .sub,body.studio-ready #app .qsub{font-size:14px;line-height:1.65}
body.studio-ready #app .kicker,body.studio-ready #app .part,body.studio-ready #app .stepname{font-size:12px;letter-spacing:.02em;text-transform:none;font-weight:600}
body.studio-ready #app .continue,body.studio-ready #app .nextbtn,body.studio-ready #app .checkbtn,body.studio-ready #app .back,body.studio-ready #app .hintbtn,body.studio-ready #app .solbtn,body.studio-ready #app .aibtn{font-size:16px;min-height:48px;border-radius:8px}
body.studio-ready #app .continue{max-width:none;text-align:left;padding:16px 20px;font-weight:600;margin-top:20px}body.studio-ready #app .card,body.studio-ready #app .wk{border-radius:12px;padding:24px}body.studio-ready #app .card{margin-top:20px}body.studio-ready #app .wk .wdesc{font-size:14px}body.studio-ready #app .mcard{background:#eef0fb;color:#413c8b;border:1px solid #dedff0;font-size:16px;font-weight:600}body.studio-ready #app .mcard.locked{background:#f0f3f7;color:#627389}
body.studio-ready #app .tile,body.studio-ready #app .wtok{font-size:18px;min-height:48px;border-radius:8px}body.studio-ready #app .tile{font-weight:500}body.studio-ready #app input,body.studio-ready #app textarea{font-size:20px!important;line-height:1.6;background:#fff;min-height:48px}body.studio-ready #app .reveal,body.studio-ready #app .aibox,body.studio-ready #app .gatebox{font-size:16px;line-height:1.75}body.studio-ready #app .fb{font-size:16px;font-weight:550}body.studio-ready #app .daywrap{max-width:900px}
body.studio-ready #ninja-save-status{margin-left:calc(var(--studio-side) + 32px);margin-right:32px;width:max-content;max-width:calc(100% - var(--studio-side) - 64px);font-size:12px}
.studio-hub-heading{margin-bottom:28px}.studio-hub-heading h1{font-size:32px;line-height:1.3;letter-spacing:-.7px;font-weight:650}.studio-hub-heading p{margin-top:12px;color:var(--ink2)}.studio-subjects{border:1px solid var(--line);border-radius:12px;background:#fff;overflow:hidden}.studio-subject{display:grid;grid-template-columns:150px minmax(0,1fr) auto;align-items:center;gap:24px;padding:28px;border-bottom:1px solid var(--line)}.studio-subject:last-child{border:0}.studio-subject h2{font-size:20px;font-weight:600}.studio-subject .studio-progress{font-size:24px;font-weight:600;letter-spacing:-.5px;color:var(--ink);margin-top:8px}.studio-subject p{color:var(--ink2);font-size:16px}.studio-subject small{display:block;margin-top:8px;color:var(--ink3);font-size:12px}.studio-open{min-height:48px;padding:12px 18px;display:inline-flex;align-items:center;justify-content:center;background:var(--purple);color:#fff;text-decoration:none;border-radius:8px;font-size:14px;font-weight:600;white-space:nowrap}.studio-hub-foot{margin-top:24px;display:flex;gap:16px;justify-content:space-between;color:var(--ink3);font-size:14px}.studio-hub-foot button{min-height:44px;background:white;border:1px solid var(--line);color:var(--ink2);padding:10px 16px;border-radius:8px;font-size:14px}.studio-refresh-status{font-size:12px;align-self:center}.studio-nav-error{position:fixed;bottom:16px;left:50%;transform:translateX(-50%);z-index:100;max-width:calc(100% - 32px);background:#fff4df;border:1px solid #e8bf76;padding:16px 20px;border-radius:12px;color:#704a16;box-shadow:0 5px 24px #182b4920}
body.studio-focus{--studio-side:80px}body.studio-focus .studio-brand{padding-left:6px}body.studio-focus .studio-brand span,body.studio-focus .studio-navlabel,body.studio-focus .studio-nav .studio-name,body.studio-focus .studio-sidefoot{display:none}body.studio-focus .studio-sidebar{padding-left:12px;padding-right:12px}body.studio-focus .studio-nav a{justify-content:center;padding:12px}
/* Use the existing full-viewport scratch canvas: no coordinate or storage migration. */
body.studio-ready #padfab{display:none!important}body.studio-ready #scratch{z-index:80;background:#fff;overflow:hidden}body.studio-ready #scratch canvas{background-color:#fff;background-image:radial-gradient(#d9e1ec .7px,transparent .7px);background-size:24px 24px}body.studio-ready .scratchbar{position:absolute;inset:0 0 auto 0;transform:none;display:flex;flex-wrap:wrap;border:0;border-bottom:1px solid var(--line);border-radius:0;padding:calc(12px + env(safe-area-inset-top)) 24px 12px;gap:8px;background:#fff;z-index:2;box-shadow:none}body.studio-ready .scratchbar>span{font-size:20px;font-weight:600;color:var(--ink);margin-right:auto}body.studio-ready .scratchbar button{font-size:14px;min-height:48px;background:#f0f3f8;color:var(--ink2);border-radius:8px;padding:10px 14px}body.studio-ready .scratchbar button.on{background:var(--purple-soft);color:var(--purple)}body.studio-ready .scratchbar #scr-close{font-size:26px;line-height:1;width:48px;padding:0;background:#fff;color:var(--ink);order:4}#studio-scratch-question{order:5;flex-basis:100%;border-top:1px solid var(--line);padding-top:12px;margin-top:4px;font-size:18px;line-height:1.6;font-weight:500;max-height:25dvh;overflow:auto;touch-action:pan-y;user-select:text;color:var(--ink)}
body.studio-ready .word-layout>.problem-side{top:90px}body.studio-ready .word-layout{grid-template-columns:minmax(250px,.85fr) minmax(310px,1.15fr)}
[hidden]{display:none!important}
@media(max-width:1050px){body.studio-ready{--studio-side:184px}body.studio-focus{--studio-side:80px}.studio-brand{font-size:16px;gap:8px}.studio-brand img{width:32px;height:32px}.studio-top{padding:12px 24px}body.studio-ready #app,body.studio-ready #studio-hub{padding:28px 24px 48px}.studio-subject{grid-template-columns:120px minmax(0,1fr);padding:24px;gap:20px}.studio-subject .studio-open{grid-column:2;justify-self:start}.studio-subjects .studio-subject small{margin-top:4px}body.studio-ready .word-layout{display:block}}
@media(max-width:760px){body.studio-ready,body.studio-focus{--studio-side:0px;--studio-bar:64px}.studio-sidebar,body.studio-focus .studio-sidebar{position:relative;inset:auto;width:100%;padding:8px 12px;border:0;border-bottom:1px solid var(--line);flex-direction:row;align-items:center;gap:8px}.studio-brand,body.studio-focus .studio-brand{padding:0;flex:none}.studio-brand span,.studio-navlabel,.studio-sidefoot{display:none}.studio-nav{flex:1;flex-direction:row;gap:2px;justify-content:space-between}.studio-nav a,body.studio-focus .studio-nav a{padding:10px 8px;justify-content:center;gap:4px;font-size:14px}.studio-nav .studio-letter{display:none}.studio-nav .studio-name,body.studio-focus .studio-nav .studio-name{display:inline}.studio-top{margin:0;padding:10px 16px;height:auto;min-height:64px}.studio-crumb>span{display:none}.studio-crumb{gap:8px}.studio-actions button{padding:10px 12px}body.studio-ready #app,body.studio-ready #studio-hub{width:100%;margin:0;padding:24px 16px 40px}body.studio-ready #app .card,body.studio-ready #app .wk{padding:20px}body.studio-ready #app h1,.studio-hub-heading h1{font-size:28px}body.studio-ready #app .q,body.studio-ready #app .gq,body.studio-ready #app .problem-side .q{font-size:20px}body.studio-ready #app .daytitle{font-size:18px}body.studio-ready #ninja-save-status{margin:16px;max-width:calc(100% - 32px);width:auto}.studio-subject{grid-template-columns:1fr;padding:24px;gap:12px}.studio-subject>div:first-child{display:flex;align-items:center;justify-content:space-between;gap:12px}.studio-subject .studio-progress{font-size:20px;margin:0}.studio-subject .studio-open{grid-column:auto;justify-self:stretch}.studio-hub-foot{flex-wrap:wrap}.studio-hub-heading{margin-bottom:24px}body.studio-ready .scratchbar{padding:calc(8px + env(safe-area-inset-top)) 12px 8px;gap:6px}body.studio-ready .scratchbar>span{font-size:18px;flex-basis:100%;padding-right:52px;min-height:48px;display:flex;align-items:center}body.studio-ready .scratchbar #scr-close{position:absolute;top:calc(8px + env(safe-area-inset-top));right:12px}body.studio-ready .scratchbar button{padding:10px;font-size:14px}#studio-scratch-question{font-size:16px;max-height:28dvh}body.studio-ready .word-layout>.problem-side{position:static}body.studio-ready #app .dayhead{flex-wrap:wrap}body.studio-ready .ansrow{flex-wrap:wrap}body.studio-ready .ansrow input{flex-basis:130px}.studio-nav-error{font-size:14px;width:calc(100% - 32px)}}
@media(prefers-reduced-motion:no-preference){.studio-nav a,.studio-actions button,.studio-open{transition:background-color .12s}}