/* ML workspace: graphite, mint and quiet document surfaces. */
:root {
  color-scheme: dark;
  --bg: #111916; --surface: #17211c; --surface-soft: #1d2922;
  --text: #e4ece5; --muted: #9eafa4; --border: #34483b; --hair: #26372d;
  --accent: #91d9ac; --accent-hover: #b5edc9; --accent-ink: #14251a; --accent-soft: #20392a;
  --important-bg: #1c2820; --important-border: #a8ba8c; --important-text: #c5d3b3;
  --danger: #e3a29b; --shadow: none;
  --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
}
:root[data-theme='light'] {
  color-scheme: light;
  --bg: #f5f7f2; --surface: #fff; --surface-soft: #edf1e9;
  --text: #23392b; --muted: #627868; --border: #c6d2c2; --hair: #dce4d7;
  --accent: #346b48; --accent-hover: #204f32; --accent-ink: #fff; --accent-soft: #e1eddf;
  --important-bg: #eef1e5; --important-border: #809264; --important-text: #506039;
  --danger: #a64a43;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: 100px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.85 var(--sans); padding-inline: env(safe-area-inset-left,0px) env(safe-area-inset-right,0px); padding-bottom: env(safe-area-inset-bottom,0px); }
button,input,textarea,select { font: inherit; }
a { color: var(--accent); text-decoration: none; text-underline-offset: 4px; }
a:hover { text-decoration: underline; }
button,a,input,summary { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
::selection { background: var(--accent); color: var(--accent-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
[hidden],.hidden { display: none !important; }
.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 500; padding: 10px 18px; background: var(--surface); border: 1px solid var(--accent); }.skip-link:focus { top: 12px; }
.ml-width { width: min(1180px,calc(100% - 80px)); margin-inline: auto; }
.ml-header { border-bottom: 1px solid var(--border); background: var(--bg); }
.ml-page .ml-header { position: sticky; top: 0; z-index: 50; }
.ml-header-inner { min-height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.ml-brand { display: inline-flex; align-items: center; gap: 9px; font: 550 15px var(--mono); color: var(--text); white-space: nowrap; letter-spacing: -.04em; }.ml-brand:hover { text-decoration: none; color: var(--accent); }
.ml-brand-mark { color: var(--accent); font-size: 24px; padding-right: 7px; letter-spacing: -.16em; }.ml-brand-slash { color: var(--muted); }.ml-brand-domain { color: var(--accent); }
.ml-header nav { display: flex; align-items: center; gap: 26px; }
.ml-header nav > a { display: flex; align-items: center; min-height: 44px; color: var(--muted); font: 11px var(--mono); }.ml-header nav > a:hover,.ml-header nav > a[aria-current] { color: var(--accent); text-decoration: none; }
.ml-theme-toggle { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 8px 12px; border: 1px solid var(--border); background: transparent; color: var(--text); font: 11px var(--mono); border-radius: 3px; }
.ml-theme-toggle:hover { border-color: var(--accent); background: var(--surface); }
h1,h2,h3,h4,p { margin-top: 0; }h1,h2,h3,h4 { color: var(--text); text-align: left; }
h1 { font: 500 clamp(32px,4vw,48px)/1.23 var(--mono); letter-spacing: -.055em; margin: 0 0 22px; overflow-wrap: anywhere; }
h2 { font: 500 clamp(22px,2.4vw,29px)/1.4 var(--mono); letter-spacing: -.04em; margin: 0 0 20px; }
h3 { font: 550 18px/1.5 var(--sans); margin: 0 0 14px; }h4 { font-size: 15px; }
p { margin-bottom: 18px; }b,strong { font-weight: 600; }p,li { font-size: inherit; }
code,pre { font-family: var(--mono); }code { font-size: .9em; overflow-wrap: anywhere; }pre { overflow-x: auto; padding: 18px; background: var(--surface); border: 1px solid var(--border); font-size: 12px; line-height: 1.8; }
.ml-kicker { color: var(--muted); font: 10px/1.8 var(--mono); letter-spacing: .025em; margin: 0 0 19px; }
.ml-hero { display: grid; grid-template-columns: 1.05fr 1fr; align-items: center; gap: 76px; padding: 76px 0 72px; }
.ml-hero h1 { font-size: clamp(39px,4.5vw,58px); line-height: 1.16; letter-spacing: -.065em; margin-bottom: 27px; }.ml-hero h1 span { color: var(--accent); }
.ml-hero-lead { color: var(--muted); max-width: 420px; font-size: 15px; line-height: 1.9; margin-bottom: 27px; }
.ml-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 14px 25px; }
.ml-button,button,.button,.project-link { display: inline-flex; align-items: center; justify-content: center; gap: 12px; min-height: 44px; padding: 10px 16px; border: 1px solid var(--border); border-radius: 3px; color: var(--text); background: transparent; font: 12px/1.7 var(--mono); text-decoration: none; transition: border-color .16s,background .16s; }
.ml-button:hover,button:hover,.button:hover,.project-link:hover { border-color: var(--accent); background: var(--surface-soft); text-decoration: none; color: var(--text); }
.ml-button.primary { border-color: var(--accent); background: var(--accent); color: var(--accent-ink); }.ml-button.primary:hover { background: var(--accent-hover); }
.ml-text-link { display: inline-flex; align-items: center; min-height: 44px; color: var(--muted); font: 11px var(--mono); }
.ml-hero-meta { color: var(--muted); font: 10px/1.8 var(--mono); margin: 25px 0 0; }.ml-hero-meta span { color: var(--accent); margin-right: 10px; }
.experiment { min-width: 0; border: 1px solid var(--border); background: var(--surface); border-radius: 4px; overflow: hidden; }
.experiment-top { display: flex; justify-content: space-between; align-items: center; gap: 16px; min-height: 46px; padding: 0 17px; border-bottom: 1px solid var(--border); font: 10px var(--mono); color: var(--muted); }.experiment-top > span::before { content: ''; display: inline-block; width: 5px; height: 5px; background: var(--accent); margin-right: 9px; }
.experiment-motion { font-size: 12px; padding: 4px 8px; min-height: 36px; min-width: 36px; border: 0; }
.experiment-plot { padding: 20px 20px 4px; }.experiment-plot svg { width: 100%; height: auto; display: block; }.plot-grid line { stroke: var(--border); stroke-width: .6; }.plot-axis { fill: var(--muted); font: 9px var(--mono); }.plot-point { fill: var(--accent); opacity: .85; }.plot-point.outlined { fill: none; stroke: var(--muted); stroke-width: 1.5; opacity: .8; }
.plot-boundary { stroke: var(--accent); stroke-width: 1.5; stroke-dasharray: 5 5; opacity: 0; transition: opacity .25s; }.plot-test { opacity: 0; transition: opacity .25s; }.plot-test circle { fill: var(--surface); stroke: var(--accent); stroke-width: 2; }.plot-test text { fill: var(--text); font: 10px var(--mono); }
.experiment[data-step='1'] .plot-boundary,.experiment[data-step='2'] .plot-boundary,.experiment[data-step='2'] .plot-test { opacity: 1; }
.experiment-console { border-top: 1px solid var(--border); padding: 12px 18px 13px; font: 11px/1.7 var(--mono); }.experiment-command { color: var(--accent); }.experiment-command::before { content: '❯ '; color: var(--muted); }.experiment-command::after { content: ''; display: inline-block; width: 5px; height: 11px; margin-left: 7px; background: var(--accent); animation: ml-caret 1.1s step-end infinite; }
.experiment-console p { margin: 6px 0 0; color: var(--muted); min-height: 38px; font: 11px/1.75 var(--sans); }.experiment-steps { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); border-top: 1px solid var(--border); }.experiment-steps button { border: 0; border-radius: 0; font-size: 10px; padding: 10px 3px; color: var(--muted); }.experiment-steps button[aria-selected='true'] { color: var(--accent); background: var(--accent-soft); }.experiment-steps button + button { border-left: 1px solid var(--border); }
.experiment-note { font: 9px/1.6 var(--mono); color: var(--muted); text-align: right; margin: 11px 0 0; }
.experiment.is-paused *,.experiment.is-paused *::after { animation-play-state: paused !important; }
@keyframes ml-caret { 50% { opacity: 0; } }
.ml-section { border-top: 1px solid var(--border); padding: 37px 0 43px; scroll-margin-top: 25px; }
.ml-section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }.ml-section-head h2 { margin: 0; }.ml-section-head .ml-kicker { margin-bottom: 10px; }
.ml-search { width: 270px; display: grid; gap: 7px; color: var(--muted); font: 11px var(--mono); }
input:not([type='checkbox']):not([type='color']),textarea,select,.search { min-width: 0; max-width: 100%; width: 100%; min-height: 44px; border: 1px solid var(--border); border-radius: 3px; padding: 11px 13px; background: var(--surface); color: var(--text); font: 14px/1.7 var(--sans); margin: 0; }
input::placeholder,textarea::placeholder { color: var(--muted); opacity: .85; }textarea { min-height: 110px; resize: vertical; }input[type='color'] { width: 70px; height: 44px; border: 1px solid var(--border); border-radius: 3px; padding: 5px; background: var(--surface); }input[type='checkbox'] { accent-color: var(--accent); width: 18px; height: 18px; flex: none; vertical-align: middle; }
.lab-route { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--border); }.lab-route li { margin: 0; }.lab-route a { display: grid; grid-template-columns: 45px minmax(0,1fr) 30px; gap: 25px; padding: 25px 8px; border-bottom: 1px solid var(--border); text-decoration: none; color: var(--text); transition: background .16s,padding .16s; }.lab-route a:hover { background: var(--surface); padding-inline: 16px; }.lab-number { color: var(--muted); font: 12px/1.8 var(--mono); padding-top: 2px; }.lab-route h3 { font: 500 21px/1.4 var(--mono); letter-spacing: -.04em; margin: 0 0 9px; }.lab-route p { color: var(--muted); font-size: 14px; line-height: 1.8; margin: 0; max-width: 800px; }.lab-arrow { color: var(--muted); font-size: 23px; align-self: center; text-align: right; }.lab-route a:hover .lab-arrow { color: var(--accent); }
.ml-search-status { color: var(--muted); font: 12px/1.7 var(--sans); margin: 15px 0 0; }
.ml-path { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 38px; margin-top: 25px; }.ml-path-step { border-top: 1px solid var(--border); padding-top: 19px; }.ml-path-step > span { color: var(--accent); font: 10px var(--mono); }.ml-path-step h3 { font: 500 20px var(--mono); margin: 16px 0 13px; }.ml-path-step p { color: var(--muted); font-size: 14px; margin: 0; }
.ml-resource-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 44px; margin-top: 10px; }.ml-resource-grid a { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 19px 0; border-bottom: 1px solid var(--hair); color: var(--text); font-size: 14px; }.ml-resource-grid a span { color: var(--muted); font: 10px var(--mono); text-align: right; }
.ml-exchange { margin-top: 24px; color: var(--muted); }.ml-exchange summary { min-height: 44px; cursor: pointer; font-size: 13px; }.ml-exchange-links { display: flex; flex-wrap: wrap; gap: 10px 25px; padding: 6px 0 10px; }.ml-exchange-links a { font: 12px/1.8 var(--mono); padding: 7px 0; }
.ml-defense { display: flex; justify-content: space-between; align-items: center; gap: 50px; border-top: 1px solid var(--border); padding: 39px 0 51px; }.ml-defense p { color: var(--muted); max-width: 640px; margin: 0; }.ml-defense .ml-actions { flex: none; }
.ml-footer { border-top: 1px solid var(--border); }.ml-footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 18px 30px; min-height: 95px; padding-block: 25px; }.ml-footer-inner > span { color: var(--muted); font: 11px var(--mono); }.ml-footer-links { display: flex; gap: 24px; }.ml-footer-links a { color: var(--muted); font: 11px/1.8 var(--mono); padding: 10px 0; }

/* Laboratory documents share their shell, while original task controls stay in place. */
.ml-workspace { width: min(1440px,100%); margin-inline: auto; display: grid; grid-template-columns: 245px minmax(0,1fr); }
.lesson-index { padding: 28px 21px 30px 26px; border-right: 1px solid var(--border); align-self: start; position: sticky; top: 86px; max-height: calc(100dvh - 86px); overflow-y: auto; }
.lesson-index .index-caption { font: 10px/1.8 var(--mono); color: var(--muted); margin: 0 0 15px; }.lesson-index nav { display: grid; gap: 2px; }.lesson-index nav a { color: var(--muted); font-size: 12px; line-height: 1.65; padding: 9px 10px; border-left: 2px solid transparent; }.lesson-index nav a:hover { color: var(--accent); text-decoration: none; }.lesson-index nav a[aria-current] { color: var(--text); border-left-color: var(--accent); }
.lesson-index .index-labs { margin-top: 25px; padding-top: 21px; border-top: 1px solid var(--border); }.index-labs a span { font: 10px var(--mono); margin-right: 9px; color: var(--muted); }
.task-progress { border-top: 1px solid var(--border); margin-top: 26px; padding-top: 19px; }.task-progress p { color: var(--muted); font: 11px/1.8 var(--mono); margin: 0 0 10px; }.task-progress-track { height: 2px; background: var(--border); }.task-progress-track span { display: block; height: 100%; width: 0; background: var(--accent); }.task-progress small { display: block; color: var(--muted); font-size: 11px; margin-top: 12px; }
.container { width: min(980px,calc(100% - 76px)); min-width: 0; margin: 0 auto 60px; }
.ml-service .container { width: min(1180px,calc(100% - 80px)); }
.page-heading { padding: 35px 0 27px; border-bottom: 1px solid var(--border); margin-bottom: 34px; }.page-heading .ml-kicker { margin: 24px 0 18px; }.page-heading h1 { margin-bottom: 18px; }.page-heading > p:last-child { color: var(--muted); margin-bottom: 0; font-size: 15px; }
.ml-breadcrumb { display: flex; flex-wrap: wrap; gap: 9px; color: var(--muted); font: 10px/1.8 var(--mono); }.ml-breadcrumb a { color: inherit; }.ml-breadcrumb span:last-child { color: var(--text); }
.mobile-contents { display: none; }
.card { border: 0; border-top: 1px solid var(--border); border-radius: 0; background: transparent; box-shadow: none; padding: 30px 0; margin: 28px 0; min-width: 0; }.card > :first-child { margin-top: 0; }.card > :last-child { margin-bottom: 0; }
.important-card { background: var(--important-bg); border: 0; border-left: 2px solid var(--important-border); padding: 18px 23px; margin: 27px 0; }.important-card h2 { font: 600 15px/1.6 var(--sans); color: var(--important-text); margin-bottom: 12px; }.important-card li { font-size: 14px; }.important-card .nested-list > li { margin-bottom: 10px; }
.container :is(h2,h3,.card,.qa-card) { scroll-margin-top: 25px; }.container p,.container li { overflow-wrap: anywhere; }.container ul,.container ol { padding-left: 22px; }.container li { margin-bottom: 10px; }
.ml-workspace .container :is(h2,h3,.card,.qa-card) { scroll-margin-top: 110px; }
.nested-list { list-style: none; counter-reset: item; padding-left: 0 !important; }.nested-list > li { counter-increment: item; position: relative; padding-left: 30px; margin-bottom: 15px; }.nested-list > li::before { content: counter(item,decimal-leading-zero); position: absolute; left: 0; top: 3px; color: var(--muted); font: 10px/1.8 var(--mono); }.nested-list > li:has(> .task-label)::before { display: none; }.nested-list > li:has(> .task-label) { padding-left: 0; }.subitem { list-style: disc; margin: 12px 0 0; padding-left: 24px; }.subitem li::marker { color: var(--muted); }
.task-label { display: flex; align-items: start; gap: 12px; min-height: 44px; cursor: pointer; padding: 8px 0; }.task-label input { margin: 5px 0 0; }.task-label > span { min-width: 0; }.task-label:has(input:checked) > span { color: var(--muted); }.task-label:has(input:focus-visible) { outline: 1px solid var(--accent); outline-offset: 4px; }.task-label input:focus-visible { outline: none; }
.container img { display: block; max-width: 100%; width: auto; height: auto; margin: 23px auto; border: 1px solid var(--border); border-radius: 3px; box-shadow: none; cursor: zoom-in; }
.container video,.container audio,.container iframe { display: block; max-width: 100%; margin: 25px auto; border: 1px solid var(--border); border-radius: 3px; }.container video { height: auto; }.container iframe { width: 100%; min-height: 400px; }
.progress-container { position: fixed; left: 0; right: 0; top: 0; height: 3px; background: transparent; z-index: 200; pointer-events: none; }#progress-bar { height: 3px; width: 0; background: var(--accent); font-size: 0; line-height: 0; overflow: hidden; }
.lab-neighbors { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 25px; margin-top: 50px; border-top: 1px solid var(--border); padding-top: 24px; }.lab-neighbors a { display: grid; gap: 8px; color: var(--text); font: 13px/1.7 var(--mono); }.lab-neighbors small { color: var(--muted); font: 10px/1.8 var(--mono); }
.site-note { background: var(--surface); border-left: 2px solid var(--border); padding: 14px 18px; margin: 22px 0; color: var(--muted); }
.center-button { display: flex; width: fit-content; max-width: 100%; margin: 22px 0; }.stack-center { display: grid; gap: 12px; }.stack-center > :is(input,textarea) { margin: 0; }
.container :is(#genSimpleFunc,#genHardFunc,#genDoubleFunc) { width: auto; }.container :is(#mathSimpleFunc,#mathHardFunc,#mathDoubleFunc) { overflow-x: auto; max-width: 100%; font-size: 24px; padding-block: 10px; }
label.field-label { display: grid; gap: 7px; margin: 16px 0; color: var(--muted); font-size: 12px; }.field-label input,.field-label textarea,.field-label select { color: var(--text); }
.qa-tools { display: flex; gap: 14px; align-items: end; margin: 25px 0 30px; }.qa-tools .ml-search { flex: 1; }.qa-tools button { flex: none; }
.qa-card { border: 0; border-bottom: 1px solid var(--border); border-radius: 0; background: transparent; margin: 0; padding: 0; }.qa-card summary { display: flex; align-items: start; justify-content: space-between; gap: 20px; list-style: none; cursor: pointer; padding: 22px 0; }.qa-card summary::-webkit-details-marker { display: none; }.qa-card summary h2 { font: 500 18px/1.6 var(--mono); letter-spacing: -.03em; margin: 0; }.qa-card summary::after { content: '+'; color: var(--muted); font: 20px var(--mono); flex: none; }.qa-card[open] summary::after { content: '−'; color: var(--accent); }.qa-card[open] summary h2 { color: var(--accent); }.qa-content { padding: 0 0 25px; }.qa-content > p:first-child { margin-top: 0; }
.project-tools { margin-bottom: 26px; }.project-tools .ml-search { width: min(100%,450px); }.project-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; }.project-card { min-width: 0; position: relative; padding: 22px; border: 1px solid var(--border); border-left: 2px solid var(--project-color,var(--accent)); background: var(--surface); border-radius: 3px; }.project-title { font: 500 20px/1.5 var(--mono); letter-spacing: -.035em; margin-bottom: 10px; overflow-wrap: anywhere; }.project-meta { color: var(--muted); font-size: 12px; line-height: 1.8; margin: 0 0 13px; }.project-desc { font-size: 14px; line-height: 1.8; margin: 0 0 20px; }.project-link { font-size: 11px; }.project-status::before { border-color: var(--border); border-top-color: var(--accent); }.group-folder { border: 0; border-top: 1px solid var(--border); background: transparent; margin: 0; padding: 0; }.group-folder > summary { padding: 18px 0; min-height: 54px; cursor: pointer; color: var(--text); font: 13px/1.8 var(--mono); }.group-content { padding: 10px 0 25px; }
.record { border-left: 2px solid var(--accent); background: var(--surface); padding: 17px 20px; margin-top: 15px; }
#chat { display: flex; flex-direction: column; align-items: start; gap: 12px; min-height: 340px; max-height: 55dvh; overflow-y: auto; overscroll-behavior: contain; padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: 3px; margin-bottom: 18px; }
.message { min-width: 0; max-width: 85%; padding: 12px 15px; font-size: 14px; line-height: 1.8; overflow-wrap: anywhere; background: var(--surface-soft); border: 1px solid var(--border); border-left: 2px solid var(--sender-color,var(--border)); border-radius: 3px; box-shadow: none; }.message.self { margin-left: auto; border-left-color: var(--accent); }.message b { display: block; color: var(--muted); font: 10px/1.8 var(--mono); margin-bottom: 6px; }.message .file-link { color: var(--accent); font-weight: 400; }#inputArea { display: block; margin: 12px 0; }#message { margin-bottom: 12px; }#secret { overflow-wrap: anywhere; }
.teacher-shell { display: grid; gap: 24px; }.teacher-topbar { display: flex; align-items: start; justify-content: space-between; flex-wrap: wrap; gap: 20px; }.teacher-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 22px; }.teacher-panel { min-width: 0; border: 1px solid var(--border); padding: 23px; background: var(--surface); border-radius: 3px; }.teacher-panel h2 { font-size: 24px; }.teacher-panel h3 { font-size: 18px; }.teacher-form { display: grid; gap: 12px; }.teacher-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }.teacher-form .row-3 { display: grid; grid-template-columns: 2fr 1fr auto; gap: 12px; align-items: end; }.teacher-list { display: grid; gap: 12px; margin-top: 18px; }.teacher-item { border: 1px solid var(--border); padding: 17px; background: var(--surface-soft); }.teacher-item h4 { margin: 0 0 13px; font-size: 16px; }.teacher-muted { color: var(--muted); font-size: 13px; }.student-note { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 10px; align-items: center; margin-top: 10px; }.matrix-toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }.matrix-wrap { max-width: 100%; overflow-x: auto; border: 1px solid var(--border); border-radius: 3px; }.matrix-table { width: 100%; min-width: 760px; border-collapse: collapse; font-size: 13px; }.matrix-table th,.matrix-table td { border: 1px solid var(--border); padding: 12px; text-align: center; vertical-align: middle; }.matrix-table th { background: var(--surface-soft); color: var(--muted); font-weight: 500; }.matrix-table :is(th,td):first-child { min-width: 220px; text-align: left; }.matrix-cell { width: 100%; min-height: 44px; padding: 8px; font: 11px/1.6 var(--mono); }.matrix-cell.ok { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }.matrix-cell.bad { color: var(--muted); border-color: var(--border); }.mini-button { width: auto; font-size: 11px; padding: 9px 12px; }.danger-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }.danger-button { color: var(--danger); border-color: color-mix(in srgb,var(--danger) 55%,var(--border)); }.danger-button:hover { background: transparent; border-color: var(--danger); color: var(--danger); }
.auth-wrap { display: grid; place-items: center; min-height: 58dvh; padding: 35px 0; }.auth-card { width: min(100%,480px); padding: 28px; margin: 0; border: 1px solid var(--border); background: var(--surface); border-radius: 3px; }.auth-card h1 { font-size: 29px; }.auth-card .teacher-form { margin-top: 22px; }
.image-viewer { width: min(1280px,calc(100% - 24px)); max-height: calc(100dvh - 24px); background: var(--surface); color: var(--text); border: 1px solid var(--border); padding: 52px 12px 12px; border-radius: 4px; }.image-viewer::backdrop { background: #07130be8; }.image-viewer img { display: block; max-width: 100%; max-height: calc(100dvh - 100px); object-fit: contain; margin: auto; }.image-viewer button { position: absolute; top: 5px; right: 7px; min-width: 44px; font-size: 18px; padding: 5px; }
.page-heading > p:not(.ml-kicker) { color: var(--muted); margin-bottom: 0; }
#projectList { display: block; }.project-card.is-unavailable { opacity: 1; filter: none; border-style: dashed; }
.example-nav { display: flex; flex-wrap: wrap; gap: 10px 25px; margin-bottom: 25px; }.example-nav a { display: inline-flex; align-items: center; min-height: 44px; font: 12px var(--mono); }
.upload-box { border: 1px dashed var(--accent); background: var(--surface); padding: 30px 20px; text-align: center; cursor: pointer; margin-block: 25px; }.images-container { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 25px; margin-block: 30px; }.image-card { min-width: 0; }.image-card canvas { max-width: 100%; height: auto; }.image-card img:not([src]) { display: none; }
@media (max-width:650px) { .images-container { grid-template-columns: minmax(0,1fr); }.ml-header nav > a { min-width: 44px; justify-content: center; } }

@media (max-width: 1100px) { .ml-hero { gap: 38px; }.ml-hero h1 { font-size: 45px; }.ml-workspace { grid-template-columns: 210px minmax(0,1fr); }.lesson-index { padding-inline: 17px; }.container { width: calc(100% - 48px); }.ml-defense { gap: 30px; } }
@media (max-width: 900px) {
  .ml-workspace { display: block; }.lesson-index { display: none; }.container { width: calc(100% - 48px); }
  .mobile-contents { display: block; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); margin: 22px 0 0; }.mobile-contents > summary { display: flex; justify-content: space-between; align-items: center; min-height: 48px; font: 12px var(--mono); color: var(--muted); cursor: pointer; list-style: none; }.mobile-contents > summary::after { content: '⌄'; }.mobile-contents nav { display: grid; padding-bottom: 12px; }.mobile-contents nav a { padding: 10px 0; min-height: 44px; font-size: 14px; }
  .ml-header-inner { min-height: 72px; }.ml-header nav { gap: 20px; }.page-heading { padding-top: 24px; }
  .ml-hero { grid-template-columns: 1fr 1fr; gap: 28px; padding: 55px 0; }.ml-hero h1 { font-size: 37px; }.ml-hero-lead { font-size: 14px; }.ml-hero .ml-actions { gap: 10px 15px; }.ml-hero-meta { font-size: 9px; }.experiment-plot { padding: 15px 12px 2px; }.experiment-console p { min-height: 58px; }.ml-path { gap: 24px; }.ml-resource-grid { gap: 0 26px; }.ml-defense { display: grid; gap: 22px; }
}
@media (max-width: 650px) {
  html { scroll-padding-top: 20px; }.ml-width,.ml-service .container,.container { width: calc(100% - 32px); }.ml-header-inner { min-height: 70px; gap: 12px; padding-top: env(safe-area-inset-top,0px); }.ml-brand { font-size: 13px; gap: 6px; }.ml-brand-mark { font-size: 20px; padding-right: 3px; }.ml-header nav { gap: 16px; }.ml-header nav > a { font-size: 10px; }.ml-header nav .ml-nav-labs { display: none; }.ml-theme-toggle { min-width: 44px; padding: 8px; }.ml-theme-toggle .theme-word { display: none; }
  body { font-size: 15px; }h1 { font-size: clamp(27px,7.5vw,37px); }h2 { font-size: 23px; }h3 { font-size: 17px; }
  .ml-hero { grid-template-columns: minmax(0,1fr); padding: 40px 0; gap: 31px; }.ml-hero h1 { font-size: clamp(36px,10vw,52px); }.ml-hero-lead { font-size: 15px; max-width: 500px; }.ml-hero-meta { font-size: 10px; }.experiment-top { padding-inline: 14px; }.experiment-plot { padding: 18px 18px 4px; }.experiment-console p { min-height: 39px; }.experiment-motion { min-height: 44px; }.experiment-note { font-size: 9px; }
  .ml-section { padding: 29px 0 35px; }.ml-section-head { display: grid; gap: 22px; }.ml-search { width: 100%; }input:not([type='checkbox']):not([type='color']),textarea,select { font-size: 16px; }
  .lab-route a { grid-template-columns: 27px minmax(0,1fr) 16px; gap: 12px; padding: 23px 0; }.lab-route a:hover { padding-inline: 0; }.lab-number { font-size: 10px; }.lab-route h3 { font-size: 18px; }.lab-route p { font-size: 14px; }.lab-arrow { font-size: 20px; }
  .ml-path,.ml-resource-grid { grid-template-columns: minmax(0,1fr); gap: 24px; }.ml-resource-grid { gap: 0; }.ml-defense { padding: 31px 0 35px; }.ml-defense .ml-actions { gap: 10px; }.ml-footer-inner { align-items: start; gap: 18px; }.ml-footer-inner > span { order: 3; width: 100%; }.ml-footer-links { gap: 20px; }
  .page-heading { padding: 22px 0; margin-bottom: 26px; }.page-heading .ml-kicker { margin: 22px 0 15px; }.page-heading > p:last-child { font-size: 14px; }.ml-breadcrumb { font-size: 10px; }.card { padding: 26px 0; margin: 24px 0; }.important-card { padding: 15px 17px; }.important-card li { font-size: 14px; }.container img { margin: 20px auto; }.container video { margin: 20px 0; }.container iframe { min-height: 300px; }
  .task-label { gap: 11px; }.task-label input { margin-top: 4px; }.nested-list > li { padding-left: 25px; }.subitem { padding-left: 20px; }.lab-neighbors { grid-template-columns: minmax(0,1fr); gap: 23px; }
  .qa-tools { flex-wrap: wrap; }.qa-tools .ml-search { flex-basis: 100%; }.qa-card summary { padding: 20px 0; gap: 14px; }.qa-card summary h2 { font-size: 16px; }.qa-content { padding-bottom: 18px; }
  .project-grid,.teacher-grid,.teacher-form .row,.teacher-form .row-3 { grid-template-columns: minmax(0,1fr); }.project-card { padding: 19px; }.project-title { font-size: 19px; }.teacher-panel { padding: 18px; }.teacher-panel h2 { font-size: 22px; }.student-note { grid-template-columns: minmax(0,1fr); }.matrix-toolbar { gap: 10px; }.danger-actions { gap: 8px; }.auth-card { padding: 23px 20px; }.auth-card h1 { font-size: 26px; }
  #chat { min-height: 300px; max-height: 52dvh; padding: 13px; }.message { max-width: 95%; padding: 10px 12px; }.center-button { width: 100%; }
}
@media (max-width: 360px) { .ml-header nav { gap: 12px; }.ml-brand { font-size: 12px; }.ml-header nav > a { font-size: 9px; }.experiment-steps button { font-size: 9px; }.ml-hero h1 { font-size: 36px; } }

/* Reading, working materials and the small command shell. */
.reading-progress { margin-top: 26px; padding-top: 19px; border-top: 1px solid var(--border); }
.reading-progress p { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font: 11px/1.8 var(--mono); }
.reading-progress-track { height: 2px; background: var(--border); }
.reading-progress-track span { display: block; width: 0; height: 100%; background: var(--accent); }
.nested-list.subitem { list-style: none; }
.nested-list.subitem > li { padding-left: 17px; }
.nested-list.subitem > li::before { content: '-'; font: inherit; top: 0; }
.ml-resource-grid a { justify-content: start; gap: 16px; min-height: 90px; }
.ml-resource-grid .resource-ascii { flex: none; color: var(--accent); font: 21px/1 var(--mono); width: 40px; text-align: left; }
.ml-resource-grid .resource-label { color: var(--text); font: 15px/1.7 var(--sans); text-align: left; }
.ml-resource-grid small { display: block; color: var(--muted); font: 11px/1.8 var(--mono); margin-top: 5px; }
.ml-resource-grid .resource-arrow { margin-left: auto; color: var(--muted); font: 14px var(--mono); }
.ml-home #resources { border-top: 0; border-bottom: 1px solid var(--border); padding: 25px 0 12px; }
.ml-home #resources .ml-section-head { margin-bottom: 9px; }
.ml-home #resources .ml-kicker { display: none; }
.ml-home #resources h2 { font-size: 23px; }
.ml-home #resources .ml-resource-grid { grid-template-columns: repeat(4,minmax(0,1fr)); gap: 0 25px; }
.ml-home #resources .ml-resource-grid a { gap: 10px; border-bottom: 0; }
.ml-home #resources .resource-label { min-width: 0; font-size: 14px; }
.ml-home #resources .resource-ascii { width: 30px; }
.ml-home #resources .resource-arrow { display: none; }
.ml-home #resources .ml-exchange { margin-top: 7px; }
.ml-home .ml-hero { padding-block: 40px 48px; }
.experiment-shell { display: flex; align-items: center; gap: 9px; padding: 5px 13px; border-top: 1px solid var(--border); }
.experiment-shell label { color: var(--accent); font: 13px var(--mono); }
.experiment-shell input { background: transparent !important; border: 0 !important; font-family: var(--mono) !important; padding: 8px !important; }
.experiment-shell button { border: 0; flex: none; padding: 5px 8px; }
.terminal-output { white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; padding: 15px 18px; background: var(--accent-soft); border: 0; border-top: 1px solid var(--border); font: 11px/1.9 var(--mono); }
.plot-boundary { stroke-dasharray: 4 4; stroke-width: 2; }

.lab-figure { width: min(100%,760px); margin: 28px auto; border: 1px solid var(--border); border-radius: 4px; background: var(--surface); overflow: hidden; }
.container .lab-figure img { display: block; max-height: 460px; max-width: 100%; width: auto; object-fit: contain; margin: 0 auto; border: 0; border-radius: 0; }
.lab-figure figcaption { padding: 11px 15px; border-top: 1px solid var(--border); color: var(--muted); font: 11px/1.7 var(--mono); }
.project-editor { display: grid; grid-template-columns: minmax(0,1.3fr) minmax(0,1fr); align-items: start; gap: 34px; padding-top: 15px; }
.project-form { display: grid; gap: 20px; min-width: 0; }
.project-form .field-label { margin: 0; font-size: 13px; }
.project-fields-row { display: grid; grid-template-columns: 1.4fr 1fr; gap: 16px; }
.project-form small { font-size: 11px; line-height: 1.7; }
.project-form textarea { min-height: 130px; }
.project-color-row { display: flex; gap: 20px; align-items: end; }
.project-color-row output { padding: 10px 0; color: var(--muted); font: 12px var(--mono); }
.project-preview { min-width: 0; position: sticky; top: 115px; }
.project-preview .project-card { background: color-mix(in srgb,var(--project-color) 14%,var(--surface)); }
.project-link[aria-disabled='true'] { color: var(--muted); cursor: default; }
.project-form .ml-actions button { width: auto; }
.container :is(#mathSimpleFunc,#mathHardFunc,#mathDoubleFunc) { display: grid; place-items: center; width: 100%; min-height: 125px; padding: 25px 12px; margin: 24px 0 30px; border-block: 1px solid var(--border); color: var(--accent); text-align: center; font: 500 clamp(27px,3vw,38px)/1.6 var(--mono); white-space: normal; overflow-wrap: anywhere; }
body[data-lab='5'] .center-button { margin-inline: auto; }
.formula-note { padding: 22px 15px; margin: 25px 0; border-block: 1px solid var(--border); background: transparent; text-align: center; font-size: clamp(24px,2.8vw,34px); overflow-x: auto; }
.formula-note p { margin: 0; text-align: center; }
.formula-note.excel-formula { font: clamp(17px,2vw,23px)/1.8 var(--mono); overflow-wrap: anywhere; }
.question-draw { border-top: 1px solid var(--border); padding-top: 34px; margin-top: 38px; }
.question-draw h2 { font-size: 24px; }
.question-draw > p { color: var(--muted); }
.draw-result { display: flex; flex-wrap: wrap; align-items: center; gap: 15px; min-height: 60px; margin: 20px 0; color: var(--muted); }
.draw-result a { display: inline-flex; align-items: center; justify-content: center; min-width: 64px; min-height: 58px; border: 1px solid var(--border); font: 26px var(--mono); }
.draw-result a:hover { border-color: var(--accent); text-decoration: none; }
.easter-link { color: inherit; text-decoration: none; }
.easter-link:hover { color: var(--accent); text-decoration: underline dotted; }
.system-message pre { border: 0; padding: 0; margin: 0; background: transparent; font-size: 13px; }
.project-card { transition: opacity .2s,background-color .2s,border-color .2s; }
.project-card[data-availability='available'] { border-left-color: var(--project-color,var(--accent)); background: color-mix(in srgb,var(--project-color,var(--accent)) 20%,var(--surface)); }
.project-card[data-availability='checking'] { border-left-color: var(--border); }
.project-card.is-unavailable { opacity: .52; filter: grayscale(1); border-style: solid; border-left-color: var(--border); }
.project-health { display: block; margin: 17px 0 0; color: var(--muted); font: 10px/1.8 var(--mono); }
.project-health::before { content: ''; display: inline-block; width: 5px; height: 5px; margin-right: 8px; background: var(--muted); border-radius: 50%; }
[data-availability='available'] .project-health::before { background: var(--project-color,var(--accent)); }
@media (max-width:1100px) { .project-editor { grid-template-columns: minmax(0,1fr); }.project-preview { position: static; max-width: 560px; } }
@media (max-width:650px) {
  .project-fields-row { grid-template-columns: minmax(0,1fr); gap: 20px; }
  .ml-header nav > a { font-size: 11px; }
  .container .lab-figure img { max-height: 340px; }
  .lab-figure figcaption { padding: 10px 12px; font-size: 10px; }
  .ml-resource-grid .resource-ascii { font-size: 19px; width: 34px; }
  .ml-resource-grid .resource-label { font-size: 14px; }
  .formula-note { font-size: 25px; }
  .project-form .ml-actions { align-items: start; flex-direction: column; }
  .question-draw h2 { font-size: 21px; }
}
@media (max-width:900px) { .ml-home #resources .ml-resource-grid { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 0 20px; } }
@media (max-width:650px) {
  .ml-home #resources .ml-resource-grid { gap: 0 15px; }
  .ml-home #resources .resource-ascii { width: 23px; font-size: 17px; }
  .ml-home #resources .resource-label { font-size: 13px; }
  .ml-home #resources .ml-resource-grid a { align-items: start; padding-top: 16px; gap: 9px; min-height: 106px; }
  .ml-home #resources .resource-ascii { padding-top: 6px; }
  .ml-home #resources small { font-size: 10px; }
}
@media (prefers-reduced-motion: reduce) { *,*::before,*::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; } }
@media print { :root { color-scheme: light; --bg:#fff; --surface:#fff; --surface-soft:#fff; --text:#111; --muted:#555; --border:#ccc; --accent:#285c3b; }.ml-header,.ml-footer,.lesson-index,.mobile-contents,.progress-container,.ml-actions,.qa-tools,.project-tools,.lab-neighbors,.image-viewer,button { display: none !important; }.ml-workspace { display: block; }.container,.ml-width,.ml-service .container { width: 100%; margin: 0; }.page-heading { padding-top: 0; }.qa-content { display: block !important; }.ml-hero { display: block; }.ml-hero-visual { display: none; }.card,.important-card { break-inside: avoid; } }