/* Mr. K's Classroom: shared styles for the Interactive Math tools.
   Same visual language as the site: flat color, thick ink outlines, hard offset shadows.
   Type: Bricolage Grotesque (display), Atkinson Hyperlegible (reading). */
:root{
  --paper:#f4f5fb; --card:#ffffff; --wash:#e6e9f8; --ink:#14173a; --ink-soft:#4a4f78; --line:#cfd3ea; --grid:#e3e6f4; --axis:#14173a;
  --blue:#3547f5; --blue-tint:#e2e6ff; --orange:#ff8a1f; --orange-tint:#ffe8d0; --green:#14a873; --green-tint:#d6f5e8;
  --purple:#7448ff; --purple-tint:#ebe3ff; --red:#e0334f; --red-tint:#fde2e7; --sun:#ffd23f; --ghost:#9aa0c8;
  --display:"Bricolage Grotesque","Trebuchet MS",system-ui,sans-serif;
  --body:"Atkinson Hyperlegible","Segoe UI",system-ui,sans-serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --paper:#0e1024; --card:#171a36; --wash:#20244a; --ink:#eef0ff; --ink-soft:#b4b9e6; --line:#353a6b; --grid:#252a52; --axis:#c9cdf2;
  --blue:#7d8aff; --blue-tint:#262d6e; --orange:#ff9a3d; --orange-tint:#4a2e14; --green:#3ad69f; --green-tint:#123d30;
  --purple:#a58bff; --purple-tint:#2f2463; --red:#ff6b84; --red-tint:#4a1a26; --ghost:#6b71a6; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#0e1024; --card:#171a36; --wash:#20244a; --ink:#eef0ff; --ink-soft:#b4b9e6; --line:#353a6b; --grid:#252a52; --axis:#c9cdf2;
  --blue:#7d8aff; --blue-tint:#262d6e; --orange:#ff9a3d; --orange-tint:#4a2e14; --green:#3ad69f; --green-tint:#123d30;
  --purple:#a58bff; --purple-tint:#2f2463; --red:#ff6b84; --red-tint:#4a1a26; --ghost:#6b71a6; color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.45}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--orange);outline-offset:2px}
[hidden]{display:none!important}
.lab-page{max-width:1280px;margin:0 auto;padding:18px max(16px,env(safe-area-inset-right,0px)) 32px max(16px,env(safe-area-inset-left,0px));display:grid;gap:16px}
.lab-head{display:flex;flex-wrap:wrap;gap:6px 18px;align-items:baseline;justify-content:space-between}
.lab-eyebrow{margin:0;font-family:var(--display);font-weight:700;font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;color:var(--blue)}
.lab-title{margin:2px 0 0;font-family:var(--display);font-weight:800;font-size:clamp(1.6rem,3.2vw,2.3rem);line-height:1.08;text-wrap:balance}
.lab-intro{margin:6px 0 0;color:var(--ink-soft);max-width:68ch}
.lab-grid{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(300px,1fr);gap:18px;align-items:start}
.box{background:var(--card);border:3px solid var(--ink);border-radius:14px;box-shadow:5px 5px 0 var(--ink);padding:16px;min-width:0}
.stage{padding:10px}
.stage svg{display:block;width:100%;height:auto;max-height:calc(100vh - 150px);margin:0 auto;touch-action:none;user-select:none;-webkit-user-select:none}
.panel{display:grid;gap:14px}
.panel h2,.box h2{margin:0;font-family:var(--display);font-weight:800;font-size:1.1rem}
.readout{font-size:clamp(1.3rem,2.4vw,1.75rem);font-weight:700;background:var(--wash);border-radius:10px;padding:10px 14px;text-align:center;line-height:1.3;overflow-x:auto}
.readout.small{font-size:1.1rem}
.sub{color:var(--ink-soft);font-size:.92rem;margin:0}
.slider{display:grid;gap:4px}
.slider-top{display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.slider label{font-weight:700}
.slider output{font-family:var(--display);font-weight:800;font-size:1.15rem;min-width:3ch;text-align:right;font-variant-numeric:tabular-nums}
.slider-row{display:flex;align-items:center;gap:8px}
.slider-row input[type=range]{flex:1;min-width:0;accent-color:var(--c,var(--blue));height:28px}
.nudge{width:34px;height:34px;flex:none;border-radius:8px;border:2px solid var(--ink);background:var(--card);font-weight:800;line-height:1;cursor:pointer;box-shadow:2px 2px 0 var(--ink)}
.nudge:active{transform:translate(2px,2px);box-shadow:none}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{border:2px solid var(--ink);background:var(--card);border-radius:999px;padding:5px 12px;font-weight:700;cursor:pointer;font-size:.92rem}
.chip[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.btn{border:3px solid var(--ink);background:var(--sun);color:#14173a;border-radius:10px;padding:8px 14px;font-weight:800;cursor:pointer;box-shadow:3px 3px 0 var(--ink);font-family:var(--display)}
.btn.ghost{background:var(--card);color:var(--ink)}
.btn:active{transform:translate(3px,3px);box-shadow:none}
.btn-row{display:flex;flex-wrap:wrap;gap:8px}
.tabs{display:flex;flex-wrap:wrap;gap:6px;border-bottom:3px solid var(--ink);padding-bottom:0}
.tab{border:3px solid var(--ink);border-bottom:0;border-radius:10px 10px 0 0;background:var(--wash);padding:6px 14px;font-weight:800;font-family:var(--display);cursor:pointer;margin-bottom:-3px}
.tab[aria-selected="true"]{background:var(--card);padding-bottom:9px}
.challenges{display:grid;gap:8px}
.challenges-head{display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.challenges-head span{font-weight:700;color:var(--ink-soft);font-size:.9rem;font-variant-numeric:tabular-nums}
.challenges ol{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.challenges li{display:grid;grid-template-columns:26px 1fr;gap:8px;align-items:start;padding:7px 10px;border-radius:10px;background:var(--wash);font-size:.95rem}
.challenges li .mark{width:22px;height:22px;border-radius:50%;border:2px solid var(--ink);display:grid;place-items:center;font-weight:800;font-size:.8rem;background:var(--card)}
.challenges li.done{background:var(--green-tint)}
.challenges li.done .mark{background:var(--green);border-color:var(--green);color:#fff}
.challenges li.pop{animation:pop .5s ease}
@keyframes pop{40%{transform:scale(1.03)}}
.note{display:flex;gap:10px;align-items:center;background:var(--orange-tint);border:2px dashed var(--orange);border-radius:12px;padding:10px 14px;font-size:.95rem}
.note b{font-family:var(--display)}
table.lab-table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums;font-size:.95rem}
.lab-table th,.lab-table td{border:2px solid var(--line);padding:5px 8px;text-align:center}
.lab-table th{background:var(--wash);font-family:var(--display)}
.table-wrap{overflow-x:auto}
.legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:.88rem;color:var(--ink-soft)}
.legend span{display:inline-flex;align-items:center;gap:6px}
.legend i{width:18px;height:4px;border-radius:2px;display:inline-block}
/* math */
.fr{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;font-size:.82em;margin:0 .12em;line-height:1.1}
.fr .fn{padding:0 .2em .06em;border-bottom:.08em solid currentColor}
.fr .fd{padding:.06em .2em 0}
.v{font-style:italic;font-family:"Times New Roman",Georgia,serif;font-size:1.08em}
.kv{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font-size:.95rem}
.kv dt{font-weight:700;color:var(--ink-soft)}
.kv dd{margin:0;font-weight:700}
.c-blue{color:var(--blue)} .c-orange{color:var(--orange)} .c-green{color:var(--green)} .c-purple{color:var(--purple)} .c-red{color:var(--red)}
/* svg */
.g-grid{stroke:var(--grid);stroke-width:1}
.g-axis{stroke:var(--axis);stroke-width:2}
.g-tick{fill:var(--ink-soft);font-size:12px;font-family:var(--body)}
.g-label{fill:var(--ink);font-size:15px;font-weight:700;font-family:var(--body)}
.g-handle{cursor:grab}
.g-handle:active{cursor:grabbing}
@media (max-width:860px){.lab-grid{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}