/* Learn URITP. One dark studio, like blackpearlelara.com: near-black, cool greys and Elara's
   periwinkle. The menu runs down the left side; on the home page one column; in a lesson two panes:
   Elara's world, big, on the left (3D: js/scene3d.js), and the step with its editor beside it.
   Colour means something: periwinkle moves you on, mint is "done", ElaraCheck's colours are its
   kinds of mistake (rose safety, amber units, sky writing) — the same colours as her chest pearl. */
:root {
  --page: #06070a;
  --surface: #0d0f14;
  --surface-2: #151821;
  --text: #eceef4;
  --muted: #9aa1b2;
  --faint: #626a7d;
  --line: rgba(190, 205, 255, .08);
  --line-2: rgba(190, 205, 255, .16);
  --blue: #9fb7ff;
  --blue-hover: #b9cbff;
  --blue-soft: rgba(127, 155, 255, .14);
  --go: #5df2c4;
  --go-soft: rgba(93, 242, 196, .1);
  --stop: #ff5c7a;
  --stop-soft: rgba(255, 92, 122, .1);
  --warn: #ffb020;
  --warn-soft: rgba(255, 176, 32, .1);
  --code-bg: #090a0e;
  --code-text: #e6e9f2;
  --code-line: rgba(255, 255, 255, .07);
  --radius: 16px;
  --scripts: "Noto Sans Tamil", "Noto Sans Telugu", "Noto Sans Malayalam", "Noto Sans Oriya";
  --sans: "Lexend", "Hind", var(--scripts), system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --ease: cubic-bezier(.22, .61, .36, 1);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; background: var(--page); }
body { margin: 0; background: var(--page); color: var(--text); font: 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: clip; }
button, input, select, textarea { font: inherit; color: inherit; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; border-radius: 6px; }
h1, h2, h3 { font-weight: 650; margin: 0; line-height: 1.2; letter-spacing: -.015em; }
code { font: 500 .88em/1 var(--mono); background: var(--surface-2); border: 1px solid var(--line); padding: .14em .38em; border-radius: 5px; white-space: nowrap; }
.small { color: var(--muted); font-size: 14px; margin: 0 0 12px; }
.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; }
::selection { background: var(--blue-soft); }

main { position: relative; z-index: 1; }

/* ---- the menu, down the left side ----------------------------------------------------------
   Wide screens: the name, the sections with their labels, your course, and your progress.
   Middle widths: a narrow rail of icons. Phones: a strip at the top and tabs along the bottom. */
:root { --side: 248px; --spring: cubic-bezier(.34, 1.36, .5, 1); }
.side { position: fixed; inset: 0 auto 0 0; z-index: 30; width: var(--side); display: flex; flex-direction: column; gap: 18px; padding: 20px 14px 14px;
  background: color-mix(in srgb, var(--surface) 84%, transparent); border-right: 1px solid var(--line);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); }
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 10px; font-weight: 650; font-size: 16.5px; color: var(--text); text-decoration: none; white-space: nowrap; }
.brand-mark { width: 20px; height: 20px; flex: none; border-radius: 6px; background: var(--blue); box-shadow: inset -6px -6px 0 rgba(0, 0, 0, .18); }
.side-nav { position: relative; display: grid; gap: 2px; }
.nav-btn { position: relative; z-index: 1; display: flex; align-items: center; gap: 12px; height: 42px; padding: 0 12px; border: 0; border-radius: 10px; background: none; cursor: pointer;
  color: var(--muted); font-size: 15px; font-weight: 600; white-space: nowrap; text-align: left; transition: color .25s, background .15s; }
.nav-btn svg { width: 21px; height: 21px; flex: none; }
.nav-btn:hover { color: var(--text); background: var(--surface-2); }
.nav-btn.on, .nav-btn.on:hover { color: var(--page); background: none; }
.rail-glider { position: absolute; left: 0; right: 0; top: 0; height: 42px; border-radius: 10px; background: var(--text); pointer-events: none; transition: transform .45s var(--spring), opacity .2s; }
body.in-lesson .rail-glider { opacity: .12; }
body.in-lesson .nav-btn.on { color: var(--text); }

.side-course { flex: 1; min-height: 0; overflow-y: auto; padding-top: 14px; border-top: 1px solid var(--line); scrollbar-width: thin; }
.side-k { margin: 0 10px 8px; font-size: 11.5px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--faint); }
.side-units { list-style: none; margin: 0; padding: 0; display: grid; gap: 1px; }
.su { width: 100%; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2px 8px; align-items: center; padding: 7px 10px; border: 0; border-radius: 8px; background: none; cursor: pointer;
  text-align: left; color: var(--muted); font-size: 13.5px; font-weight: 500; transition: background .12s, color .12s; }
.su:hover { background: var(--surface-2); color: var(--text); }
.su.here { background: var(--surface-2); color: var(--text); font-weight: 600; }
.su .su-n { font-size: 12px; color: var(--faint); font-variant-numeric: tabular-nums; }
.su .su-t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.su .su-bar { grid-column: 1 / -1; height: 3px; border-radius: 3px; background: var(--surface-2); overflow: hidden; }
.su.here .su-bar { background: var(--line-2); }
.su .su-bar i { display: block; height: 100%; width: var(--p, 0%); background: var(--go); border-radius: inherit; transition: width .5s var(--ease); }

.side-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; padding: 12px 6px 0; border-top: 1px solid var(--line); }
.engine-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--warn); flex: none; }
.engine-dot.ready { background: var(--go); }
.engine-dot.fail { background: var(--stop); }
.pill { font-size: 13px; color: var(--muted); padding: 4px 10px; border-radius: 99px; border: 1px solid var(--line); white-space: nowrap; }
.pill b { color: var(--text); font-weight: 600; }
.icon-btn { width: 30px; height: 30px; border-radius: 8px; border: 1px solid var(--line); background: none; cursor: pointer; display: grid; place-items: center; color: var(--muted); }
.icon-btn:hover { color: var(--text); border-color: var(--line-2); }
.icon-btn svg { width: 15px; height: 15px; }
.lang-select { cursor: pointer; max-width: 120px; border: 1px solid var(--line); border-radius: 8px; padding: 4px 8px; background: var(--surface); font-size: 13.5px; }

main { margin-left: var(--side); max-width: 1560px; padding: 36px 44px 72px; }
@media (min-width: 1200px) { .pane { margin: 0; } }

/* middle widths: a narrow rail of icons; a label shows beside the icon you point at */
@media (min-width: 761px) and (max-width: 1199px) {
  :root { --side: 76px; }
  .side { padding: 18px 10px 12px; align-items: center; }
  .brand { padding: 4px; }
  .brand-name, .side-course, .pill { display: none; }
  .side-nav { width: 100%; }
  .nav-btn { justify-content: center; padding: 0; height: 46px; }
  .nav-btn span { position: absolute; left: calc(100% + 12px); top: 50%; translate: 0 -50%; padding: 5px 10px; border-radius: 8px; font-size: 13.5px;
    color: var(--page); background: var(--text); opacity: 0; pointer-events: none; transition: opacity .15s; }
  .nav-btn:hover span, .nav-btn:focus-visible span { opacity: 1; }
  .rail-glider { height: 46px; }
  .side-foot { flex-direction: column; margin-top: auto; padding: 12px 0 0; width: 100%; }
  .lang-select { max-width: 56px; padding: 4px; font-size: 12.5px; }
  main { padding: 30px 28px 64px; }
}

/* in a lesson the menu folds to the narrow rail on screens up to 1499px wide, so the robot's
   world gets the room */
@media (min-width: 1200px) and (max-width: 1499px) {
  body.in-lesson { --side: 76px; }
  body.in-lesson .side { padding: 18px 10px 12px; align-items: center; }
  body.in-lesson .brand { padding: 4px; }
  body.in-lesson .brand-name, body.in-lesson .side-course, body.in-lesson .pill { display: none; }
  body.in-lesson .side-nav { width: 100%; }
  body.in-lesson .nav-btn { justify-content: center; padding: 0; height: 46px; }
  body.in-lesson .nav-btn span { position: absolute; left: calc(100% + 12px); top: 50%; translate: 0 -50%; padding: 5px 10px; border-radius: 8px; font-size: 13.5px;
    color: var(--page); background: var(--text); opacity: 0; pointer-events: none; transition: opacity .15s; }
  body.in-lesson .nav-btn:hover span, body.in-lesson .nav-btn:focus-visible span { opacity: 1; }
  body.in-lesson .rail-glider { height: 46px; }
  body.in-lesson .side-foot { flex-direction: column; margin-top: auto; padding: 12px 0 0; width: 100%; }
  body.in-lesson .lang-select { max-width: 56px; padding: 4px; font-size: 12.5px; }
  body.in-lesson main { padding: 30px 28px 64px; }
}

/* phones: the name and your points along the top, the sections as tabs along the bottom */
@media (max-width: 760px) {
  :root { --side: 0px; }
  .side { position: sticky; inset: auto; top: 0; width: auto; height: 52px; flex-direction: row; align-items: center; gap: 10px; padding: 0 16px;
    border-right: 0; border-bottom: 1px solid var(--line); background: var(--page); -webkit-backdrop-filter: none; backdrop-filter: none; }
  .brand { padding: 0; font-size: 16px; }
  .side-course { display: none; }
  .side-foot { margin-left: auto; padding: 0; border: 0; flex-wrap: nowrap; }
  .pill#streakPill, .icon-btn, .engine-dot { display: none; }
  .lang-select { max-width: 92px; }
  .side-nav { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; display: flex; justify-content: space-around; gap: 0;
    padding: 6px 8px calc(6px + env(safe-area-inset-bottom)); background: var(--surface); border-top: 1px solid var(--line); }
  .nav-btn { flex: 1; flex-direction: column; justify-content: center; gap: 2px; height: 52px; padding: 0; border-radius: 12px; font-size: 11.5px; font-weight: 500; }
  .nav-btn:hover { background: none; }
  .nav-btn.on, .nav-btn.on:hover, body.in-lesson .nav-btn.on { color: var(--blue); }
  .rail-glider { display: none; }
  body { padding-bottom: 72px; }
  .toast { bottom: 84px; }
  main { margin-left: 0; padding: 22px 16px 44px; }
}

/* ---- buttons ----------------------------------------------------------------------------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; cursor: pointer; white-space: nowrap; font-weight: 600; font-size: 15px; line-height: 1;
  padding: 11px 18px; border-radius: 10px; border: 1px solid transparent; transition: background .15s, border-color .15s, transform .1s; }
.btn:active { transform: scale(.98); }
.btn-go { background: var(--blue); color: #fff; }
.btn-go:hover { background: var(--blue-hover); }
.btn-go:disabled { background: var(--surface-2); color: var(--faint); cursor: not-allowed; }
.btn-line { background: var(--surface); border-color: var(--line-2); color: var(--text); }
.btn-line:hover { border-color: var(--faint); }
.btn-sm { padding: 8px 12px; font-size: 14px; }
.linkish { background: none; border: 0; padding: 0; color: var(--blue); cursor: pointer; font-size: 14.5px; }
.linkish:hover { text-decoration: underline; text-underline-offset: 3px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 4px; }

/* ---- home: one column -------------------------------------------------------------------- */
.pane { max-width: 820px; margin: 0 auto; animation: rise .3s var(--ease); }
.pane[data-pane="sandbox"] { max-width: 1180px; }
.pane[data-pane="talk"] { max-width: 1180px; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.page-head { margin-bottom: 24px; }
.page-head h1 { font-size: clamp(28px, 4vw, 36px); margin-bottom: 6px; }
.sub { color: var(--muted); margin: 0; max-width: 62ch; font-size: 16.5px; }
.sec-title { font-size: 18px; margin: 28px 0 12px; }
.kicker { margin: 0 0 4px; font-size: 13px; font-weight: 600; color: var(--blue); }

.next-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 14px 20px; padding: 20px 22px 18px; margin-bottom: 28px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.next-card h2 { font-size: 21px; }
.next-card .meta { margin: 4px 0 0; color: var(--muted); font-size: 14px; display: flex; gap: 14px; flex-wrap: wrap; }
.next-card .meta span:empty { display: none; }
.next-card .bar { grid-column: 1 / -1; }
.bar, .step-bar { height: 6px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.bar i, .step-bar i { display: block; height: 100%; width: 0; border-radius: inherit; background: var(--go); transition: width .5s var(--ease); }
@media (max-width: 560px) { .next-card { grid-template-columns: minmax(0, 1fr); } .next-card .btn { width: 100%; } }

/* the hero: what URITP is, and the robot acting out the demos beside it */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 28px; align-items: center; margin-bottom: 30px; }
.hero h1 { font-size: clamp(32px, 4.6vw, 46px); margin-bottom: 10px; letter-spacing: -.025em; }
.hero .sub { font-size: 17px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.hero-cta .btn { min-height: 46px; padding-inline: 20px; font-size: 16px; }
.hero-stage { margin: 0; }
.hero-stage .cell { box-shadow: 0 24px 60px -32px rgba(0, 0, 0, .5); }
.hero-cap { display: grid; gap: 6px; margin-top: 10px; min-height: 104px; font-size: 14.5px; }
.hero-said { font-weight: 600; }
.hero-code { display: block; white-space: pre; overflow-x: auto; padding: 8px 12px; border: 0; border-radius: 10px; font-size: 12.5px; line-height: 1.55;
  background: var(--code-bg); color: var(--code-text); min-height: 2.2em; }
.hero-code:empty { visibility: hidden; }
.hero-verdict { font-weight: 600; font-size: 14px; }
.hero-verdict[data-state="ok"] { color: var(--go); }
.hero-verdict[data-state="blocked"] { color: var(--stop); }
@media (max-width: 1100px) { .hero { grid-template-columns: minmax(0, 1fr); gap: 20px; } .hero-stage { max-width: 620px; } }
@media (max-width: 560px) { .hero-cta .btn { flex: 1 1 100%; } }

/* class codes: joining a teacher's class (api/classes.py) */
.class-join { margin-top: 18px; max-width: 460px; padding: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.class-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 12px; }
@media (max-width: 420px) { .class-fields { grid-template-columns: 1fr; } }
.class-fields label, .teach label { display: grid; gap: 4px; font-size: 14px; color: var(--muted); }
.class-fields input, .teach input { min-height: 44px; padding: 8px 12px; border: 1px solid var(--line-2); border-radius: 10px; background: var(--surface); }
#classCode { text-transform: uppercase; letter-spacing: .14em; font-family: var(--mono); }
.class-join .small { margin: 10px 0 0; }
.class-err { margin: 8px 0 0; color: var(--stop); font-size: 14px; font-weight: 500; }
.class-err:empty { display: none; }
.class-line { margin: 14px 0 0; font-size: 14.5px; color: var(--muted); }
.class-line:empty { display: none; }
.class-line .linkish { padding: 10px 0; }
.teach { max-width: 640px; }
.teach-code { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 15px; }
.teach-code b { font: 700 22px var(--mono); letter-spacing: .14em; }
.teach-list { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.teach-table-wrap { overflow-x: auto; margin: 6px 0 12px; }
.teach-table { width: 100%; font-size: 14px; }

.lang-note { margin: 0 0 22px; padding: 12px 16px; border-radius: 12px; background: var(--blue-soft); font-size: 14.5px; }
.units { display: grid; gap: 22px; }
.unit-fold > summary { list-style: none; cursor: pointer; border-radius: 10px; }
.unit-fold > summary::-webkit-details-marker { display: none; }
.unit.locked .unit-fold > summary { padding: 12px 14px; border: 1px dashed var(--line-2); }
.unit.locked .unit-fold > summary:hover { background: color-mix(in srgb, var(--surface) 60%, transparent); }
.unit.locked .unit-fold[open] > summary { border-style: solid; }
.unit.locked h2 { color: var(--muted); }
.unit.locked header { margin-bottom: 0; }
.unit.locked .unit-bar { display: none; }
.unit.locked .unit-fold[open] > .lesson-list { margin-top: 8px; }
.unit header { margin-bottom: 8px; }
.unit-k { display: flex; justify-content: space-between; margin: 0 0 2px; font-size: 13px; font-weight: 600; color: var(--muted); }
.unit h2 { font-size: 19px; }
.unit-blurb { margin: 2px 0 0; color: var(--muted); font-size: 14.5px; }
.unit-bar { height: 3px; margin-top: 10px; border-radius: 3px; background: var(--surface-2); overflow: hidden; }
.unit-bar i { display: block; height: 100%; width: var(--p, 0%); background: var(--go); transition: width .5s var(--ease); }
.lesson-list { list-style: none; margin: 0; padding: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.lesson-list li + li { border-top: 1px solid var(--line); }
.lrow { width: 100%; display: grid; grid-template-columns: 28px 1fr auto; align-items: center; gap: 12px; text-align: left; cursor: pointer; padding: 11px 16px; border: 0; background: none;
  transition: background .12s; }
.lrow:hover:not(:disabled) { background: var(--surface-2); }
.lrow:disabled { cursor: not-allowed; color: var(--faint); }
.lrow .n { width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--line-2); display: grid; place-items: center; font-size: 12.5px; font-weight: 600; color: var(--muted); }
.lrow.done .n { background: var(--go); border-color: var(--go); color: #fff; }
.lrow .title { font-weight: 500; font-size: 15.5px; }
.lrow .mins { color: var(--faint); font-size: 13px; }
.cert-band { margin: -12px 0 28px; padding: 18px 22px; border: 1px solid var(--go); background: var(--go-soft); border-radius: var(--radius); display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.cert-band h3 { font-size: 18px; }
.cert-band p { margin: 2px 0 0; color: var(--muted); }

/* talk */
.split { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 24px; align-items: start; }
@media (max-width: 900px) { .split { grid-template-columns: minmax(0, 1fr); } }
.command { display: flex; align-items: center; gap: 14px; padding: 14px; margin-bottom: 14px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.command-side { flex: 1; min-width: 0; }
.mic-text { margin: 0 0 6px; font-weight: 600; font-size: 16px; }
.mic { width: 56px; height: 56px; flex: none; border-radius: 50%; border: 0; cursor: pointer; color: #fff; display: grid; place-items: center; background: var(--blue); transition: transform .15s; }
.mic:hover { transform: scale(1.04); }
.mic svg { width: 24px; height: 24px; }
.mic.listening { background: var(--stop); animation: pulse 1.3s var(--ease) infinite; }
.mic.pulse { animation: callout 0.8s var(--ease) 3; }
@keyframes callout { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--blue) 55%, transparent); } 100% { box-shadow: 0 0 0 20px transparent; } }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--stop) 50%, transparent); } 100% { box-shadow: 0 0 0 18px transparent; } }
.type-row { display: flex; gap: 8px; }
.type-row input { flex: 1; min-width: 0; background: var(--page); border: 1px solid var(--line-2); border-radius: 10px; padding: 9px 12px; }
.type-row input:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-soft); }
.type-row input::placeholder { color: var(--faint); }
.lang-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.lang-chip { text-align: left; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 7px 10px; cursor: pointer; display: grid; gap: 1px; max-width: 100%; transition: border-color .15s; }
.lang-chip:hover { border-color: var(--line-2); }
.lang-chip b { font-size: 11.5px; font-weight: 600; color: var(--blue); }
.lang-chip span { font-size: 13.5px; line-height: 1.35; }
.hype { display: grid; gap: 8px; width: 100%; padding: 14px 16px; border-radius: var(--radius); text-align: left; cursor: pointer; background: var(--surface); border: 1px solid var(--line); }
.hype:hover { border-color: var(--line-2); }
.hype-said { display: flex; gap: 10px; align-items: baseline; }
.hype-lang { flex: none; font-size: 11.5px; font-weight: 600; color: var(--blue); background: var(--blue-soft); padding: 3px 8px; border-radius: 99px; }
.hype-text { font-weight: 600; font-size: 15px; }
.hype-code { display: block; height: calc(6.6em + 20px); overflow: hidden; font: 500 12.5px/1.65 var(--mono); white-space: pre; background: var(--code-bg); border: 0; padding: 10px 12px; border-radius: 8px; color: var(--code-text); }
.hero-heard { margin: 12px 0 8px; font-size: 14.5px; color: var(--muted); }
.hero-heard b { color: var(--text); }
.hero-code { font-size: 13px; max-height: 140px; overflow: auto; }
.hero-verdict { display: flex; align-items: center; gap: 10px; margin: 0; font-weight: 600; font-size: 14.5px; }
.hero-verdict .chk-light { margin-top: 0; }
.hero-verdict[data-state="ok"] .chk-light { background: var(--go); }
.hero-verdict[data-state="blocked"] .chk-light { background: var(--stop); }
.hero-verdict[data-state="warn"] .chk-light { background: var(--warn); }
.hero-verdict[data-state="checking"] .chk-light { background: var(--blue); }
.hero-clip { margin-top: 10px; }

/* sandbox */
.worlds { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; }
.world-card { display: grid; gap: 2px; text-align: left; padding: 12px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); cursor: pointer; transition: border-color .15s, transform .15s; }
.world-card:hover { border-color: var(--line-2); transform: translateY(-2px); }
.world-card b { font-size: 17px; margin-top: 10px; }
.world-card span:not(.wc-art) { color: var(--muted); font-size: 14px; }
.wc-art { height: 150px; border-radius: 10px; display: block; }
.wc-kitchen { background: radial-gradient(40% 50% at 30% 60%, #ef4444 0 9%, transparent 10%), radial-gradient(30% 40% at 65% 45%, #3b82f6 0 12%, transparent 13%), linear-gradient(160deg, #e9c99b, #b5874f); }
.wc-town { background: radial-gradient(30% 30% at 40% 50%, #60a5fa 0 20%, transparent 21%), radial-gradient(40% 40% at 70% 40%, #7dd3fc 0 30%, transparent 31%), linear-gradient(160deg, #9fdfb8, #5fd394); }
.wc-warehouse { background: linear-gradient(90deg, transparent 18%, #c2410c 18% 30%, transparent 30% 44%, #c2410c 44% 56%, transparent 56% 70%, #c2410c 70% 82%, transparent 82%) 0 38% / 100% 26% no-repeat,
  radial-gradient(14% 18% at 22% 78%, #facc15 0 40%, transparent 42%), repeating-linear-gradient(90deg, #9ca3af 0 2px, transparent 2px 40px), linear-gradient(160deg, #e5e7eb, #a8adb6); }
.wc-farm { background: radial-gradient(12% 16% at 74% 30%, #38bdf8 0 70%, transparent 72%), radial-gradient(9% 12% at 30% 34%, #f8fafc 0 30%, #334155 32% 45%, transparent 47%),
  repeating-linear-gradient(170deg, #65a30d 0 14px, #84cc16 14px 28px); }
.wc-factory { background: radial-gradient(8% 12% at 52% 52%, #fff7ed 0 20%, #fb923c 30%, transparent 60%), linear-gradient(90deg, transparent 30%, #94a3b8 30% 70%, transparent 70%) 0 56% / 100% 10% no-repeat,
  repeating-linear-gradient(135deg, #facc15 0 10px, #1f2937 10px 20px) 0 100% / 100% 12% no-repeat, linear-gradient(160deg, #475569, #1e293b); }

/* rewards */
.badges { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 8px; }
.badge { font: inherit; text-align: left; color: var(--faint); background: none; border: 1px dashed var(--line-2); border-radius: 10px; padding: 10px 12px; display: grid; gap: 2px; }
.badge b { font-size: 14.5px; font-weight: 600; }
.badge span { font-size: 12.5px; }
.badge.got { color: var(--text); border: 1px solid var(--line); background: var(--surface); }
.badge.got b::before { content: "★ "; color: var(--warn); }
.badge.got span { color: var(--muted); }
button.badge { cursor: pointer; }
button.badge:hover { border-color: var(--line-2); }
.skins { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 8px; }
.skin { display: grid; grid-template-columns: 36px 1fr; grid-template-rows: auto auto; column-gap: 10px; align-items: center; text-align: left; padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--surface); cursor: pointer; }
.skin:hover:not(:disabled) { border-color: var(--line-2); }
.skin:disabled { cursor: not-allowed; opacity: .5; }
.skin.on { border-color: var(--blue); box-shadow: 0 0 0 1px var(--blue); }
.skin .swatch { grid-row: span 2; width: 36px; height: 36px; border-radius: 9px; background: linear-gradient(135deg, var(--a) 0 34%, var(--b) 34% 67%, var(--c) 67%); }
.skin b { font-size: 14.5px; font-weight: 600; }
.skin .how { font-size: 12.5px; color: var(--muted); }

/* ---- lesson: the robot's world, big, on the left; the step, ElaraCheck and the editor beside it */
#lesson { animation: rise .3s var(--ease); }
.lesson-head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.lesson-title h1 { font-size: clamp(20px, 2.4vw, 26px); }
.lesson-title .kicker { margin-bottom: 2px; }
.lesson-progress { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; padding-bottom: 14px; border-bottom: 1px solid var(--line); margin-bottom: 18px; }
.sections { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; }
.sections li { display: flex; gap: 6px; align-items: center; padding: 5px 11px; border-radius: 8px; color: var(--faint); font-size: 13.5px; font-weight: 600; }
.sections li.on { color: var(--text); background: var(--surface-2); }
.sections li.done { color: var(--go); }
.sections .count { color: var(--faint); font-weight: 500; font-size: 12.5px; }
.step-bar { flex: 1 1 200px; }

.lesson-grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(370px, 1fr); gap: 20px; align-items: start; }
.stage-col { position: sticky; top: 20px; }
.stage-col .cell { aspect-ratio: 4 / 3; max-height: calc(100vh - 170px); max-height: calc(100dvh - 170px); min-height: 360px; margin: 0 auto; }
.work-col { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; min-width: 0; }
.work-col > *, .stage-col { min-width: 0; }
#lesson[data-bench="off"] .bench { display: none; }
.world-tag { position: absolute; left: 12px; top: 12px; margin: 0; padding: 5px 11px; border-radius: 99px; font-size: 12.5px; font-weight: 600; color: #fff;
  background: rgba(0, 0, 0, .45); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); pointer-events: none; }
.world-tag:empty { display: none; }
@media (max-width: 1100px) {
  .lesson-grid { grid-template-columns: minmax(0, 1fr); }
  .stage-col { position: relative; top: 0; }
  .stage-col .cell { min-height: 0; aspect-ratio: 16 / 10; }
}

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 28px; animation: rise .25s var(--ease); }
@media (max-width: 560px) { .card { padding: 20px 18px; } }
.step-k { margin: 0 0 6px; font-size: 13px; font-weight: 600; color: var(--blue); }
.card h3 { font-size: 22px; margin: 2px 0 12px; }
.card p { margin: 0 0 12px; }
.card ul, .card ol { margin: 0 0 12px; padding-left: 22px; }
.card li { margin: 4px 0; }
.goal { font-weight: 600; font-size: 17.5px; }
.status { color: var(--muted); }
.snip { margin: 0 0 12px; padding: 14px 16px; border-radius: 10px; background: var(--code-bg); color: var(--code-text); font: 500 13.5px/1.65 var(--mono); overflow-x: auto; white-space: pre; }
.code-example { font-size: 14px; }
.copy-lines { border-left: 3px solid var(--blue); }
.notes { width: 100%; border-collapse: collapse; margin: 0 0 12px; font-size: 15px; }
.notes td { padding: 8px 10px 8px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.notes td:first-child { width: 1%; white-space: nowrap; }
.tbl { border-collapse: collapse; margin: 0 0 12px; font-size: 15px; }
.tbl th, .tbl td { text-align: left; padding: 7px 16px 7px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.tbl th { color: var(--muted); font-weight: 600; }
.next-row { display: flex; justify-content: flex-end; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--line); }
.back-step { margin-top: 12px; }
.hint { padding: 12px 14px; border-left: 3px solid var(--warn); background: var(--warn-soft); border-radius: 0 10px 10px 0; font-size: 15px; white-space: pre-wrap; }
.verdict { font-weight: 600; margin: 8px 0 0; }
.verdict.good { color: var(--go); }
.verdict.bad { color: var(--stop); }

.q { font-size: 17.5px; font-weight: 600; margin-bottom: 4px; }
.q p { margin-bottom: 10px; }
.opts { display: grid; gap: 8px; margin-bottom: 12px; }
.opt { text-align: left; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--line-2); background: var(--surface); cursor: pointer; font-size: 15.5px; line-height: 1.4; transition: border-color .15s, background .15s; }
.opt:hover:not(:disabled) { border-color: var(--blue); }
.opt:disabled { cursor: default; }
.opt.right { border-color: var(--go); background: var(--go-soft); }
.opt.wrong { border-color: var(--stop); background: var(--stop-soft); }
.explain { padding: 12px 14px; border-radius: 10px; font-size: 15px; }
.explain.good { border: 1px solid var(--go); background: var(--go-soft); }
.explain.bad { border: 1px solid var(--stop); background: var(--stop-soft); }

.order-answer, .order-pool { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; padding: 12px; border-radius: 10px; margin-bottom: 8px; min-height: 54px; }
.order-answer { background: var(--surface-2); border: 1px dashed var(--line-2); }
.order-answer.empty::before { content: "Your answer goes here"; color: var(--faint); font-size: 14.5px; }
.order-pool { border: 1px solid var(--line); }
.line-chip { font: 500 13.5px/1.4 var(--mono); white-space: pre; text-align: left; padding: 7px 11px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--surface); cursor: pointer; max-width: 100%; overflow-x: auto; }
.line-chip.plain { font: 500 15px/1.4 var(--sans); }
.line-chip:hover { border-color: var(--blue); }
.line-chip.in { border-color: var(--blue); background: var(--blue-soft); }
.fill-code { font-size: 14.5px; line-height: 2.2; }
.fill-code select { font: 600 13.5px/1 var(--mono); color: #8ab4ff; background: #26262c; border: 1px solid #4f86f7; border-radius: 6px; padding: 3px 6px; }
.fill-code select.wrong { border-color: var(--stop); color: var(--stop); }
.card-end h3 { font-size: 26px; }
.budget { font-weight: 600; }
.budget b { color: var(--go); font-size: 17px; }
.budget.over b { color: var(--stop); }

/* ---- the workbench: robot, ElaraCheck, voice, editor -------------------------------------- */
.bench { display: grid; gap: 10px; }
.cell { position: relative; border-radius: var(--radius); overflow: hidden; aspect-ratio: 16 / 10; background: #050505; transition: box-shadow .3s; }
.stage-col .cell { box-shadow: 0 24px 60px -30px rgba(0, 0, 0, .45); }
.cell canvas { display: block; width: 100%; height: 100%; cursor: pointer; }
.banner { position: absolute; left: 50%; top: 12px; transform: translateX(-50%); max-width: 86%; text-align: center; padding: 7px 14px; border-radius: 99px; font-weight: 600; font-size: 14px; color: #fff; background: rgba(225, 29, 72, .92); }
.banner.warn { background: rgba(217, 119, 6, .94); }

.checker { display: flex; gap: 12px; padding: 12px 14px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--surface); transition: border-color .2s; }
.chk-light { width: 10px; height: 10px; margin-top: 6px; border-radius: 50%; flex: none; background: var(--faint); transition: background .2s; }
.checker[data-state="ok"] { border-color: var(--go); }
.checker[data-state="ok"] .chk-light { background: var(--go); }
.checker[data-state="blocked"] { border-color: var(--stop); }
.checker[data-state="blocked"] .chk-light { background: var(--stop); }
.checker[data-state="warn"] { border-color: var(--warn); }
.checker[data-state="warn"] .chk-light { background: var(--warn); }
.checker[data-state="checking"] .chk-light { background: var(--blue); }
.rk-body { min-width: 0; flex: 1; }
.rk-name { margin: 0; color: var(--muted); font-size: 12.5px; }
.rk-name b { color: var(--text); margin-right: 4px; }
.rk-text { margin: 2px 0 0; font-weight: 600; font-size: 15px; line-height: 1.4; }
.rk-errors { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 6px; }
.rk-errors li { border: 1px solid color-mix(in srgb, var(--stop) 45%, transparent); background: var(--stop-soft); border-radius: 10px; padding: 8px 11px; cursor: pointer; font-size: 14.5px; }
.rk-errors .ln { font-size: 11.5px; font-weight: 600; background: var(--stop); color: #fff; padding: 2px 7px; border-radius: 99px; margin-right: 6px; }
.rk-errors .ecode { font: 600 12px/1 var(--mono); color: var(--stop); margin-right: 4px; }
.rk-errors .tech { display: block; margin-top: 4px; font: 500 11.5px/1.5 var(--mono); color: var(--muted); word-break: break-word; }
.rk-slip { margin: 8px 0 0; font-size: 13.5px; line-height: 1.45; color: var(--muted); }
.rk-slip b, .practise b { color: var(--text); }
.rk-slip .ecode, .practise .ecode, #teachCommon .ecode { font: 600 12px/1 var(--mono); color: var(--warn); }
.rk-predict { margin: 8px 0 0; font-size: 13.5px; line-height: 1.45; color: var(--muted); }
.rk-predict b { color: var(--text); }
.rk-predict[data-decision="warn"] { color: var(--warn); }
.rk-predict[data-decision="block"] { color: var(--stop); }

.voice { display: grid; gap: 10px; padding: 14px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--surface); }
.mic-row { display: flex; align-items: center; gap: 14px; }
.lang-pick { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; }
.lang-pick select { background: var(--page); border: 1px solid var(--line-2); border-radius: 8px; padding: 3px 8px; }
.heard { margin: 0; min-height: 1.4em; color: var(--muted); }
.heard b { color: var(--text); }
.src-row { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 10px; font-size: 13.5px; }
.src-badge { font-size: 12px; font-weight: 600; padding: 4px 9px; border-radius: 99px; border: 1px solid var(--line-2); color: var(--muted); }
.skipped { color: var(--warn); }
.skipped:empty { display: none; }
.try { display: grid; gap: 8px; justify-items: start; }
.try-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.example { text-align: left; background: var(--surface-2); border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; cursor: pointer; color: var(--muted); font-size: 14px; }
.example:hover { color: var(--text); border-color: var(--line-2); }

.editor { display: flex; background: var(--code-bg); border-radius: var(--radius); overflow: hidden; border: 1px solid transparent; }
.editor:focus-within { border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-soft); }
.gutter { margin: 0; padding: 14px 8px 14px 12px; text-align: right; color: #55555c; font: 500 13.5px/1.65 var(--mono); user-select: none; min-width: 42px; overflow: hidden; border-right: 1px solid var(--code-line); }
.gutter .err { color: #fff; background: #e11d48; border-radius: 4px; padding: 0 3px; }
.editor textarea { flex: 1; min-width: 0; border: 0; outline: 0; resize: vertical; background: transparent; color: var(--code-text); padding: 14px 16px; font: 500 13.5px/1.65 var(--mono); min-height: 220px; white-space: pre; overflow: auto; tab-size: 4; caret-color: #8ab4ff; }
.run-bar { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-run { flex: 1 1 160px; font-size: 16px; padding: 13px 20px; }

/* ---- dialogs, toast ------------------------------------------------------------------------ */
.dlg { padding: 0; color: var(--text); max-width: min(580px, 92vw); border-radius: 16px; border: 1px solid var(--line-2); background: var(--surface); box-shadow: 0 30px 80px -20px rgba(0, 0, 0, .35); }
.dlg[open] { animation: rise .25s var(--ease); }
.dlg::backdrop { background: rgba(0, 0, 0, .4); }
.cert-form { padding: 24px; display: flex; flex-direction: column; gap: 12px; }
.cert-form h2 { font-size: 22px; }
.cert-form label { display: flex; flex-direction: column; gap: 6px; color: var(--muted); }
.cert-form input { background: var(--page); border: 1px solid var(--line-2); border-radius: 10px; padding: 9px 12px; }
.cert-form canvas { width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--line); }
.share-preview canvas, .share-preview video { display: block; width: 100%; height: auto; max-height: 60vh; object-fit: contain; border-radius: 10px; background: #000; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 50; padding: 11px 18px; border-radius: 10px; font-weight: 600; font-size: 14.5px; max-width: 90vw; text-align: center;
  color: var(--page); background: var(--text); box-shadow: 0 16px 40px -12px rgba(0, 0, 0, .4); animation: rise .25s var(--ease); }

/* ---- ElaraCheck's shield: drawn in the world by scene.js, plus this edge and label -------------- */
.cell { --shield: #ff2d6f; }
.cell[data-kind="units"], .cell[data-kind="reach"] { --shield: #ffb020; }
.cell[data-kind="writing"] { --shield: #38bdf8; }
.cell.blocked { box-shadow: inset 0 0 0 2px var(--shield), inset 0 0 36px color-mix(in srgb, var(--shield) 45%, transparent); }
.barrier { position: absolute; left: 50%; bottom: 12px; transform: translateX(-50%); padding: 7px 14px; border-radius: 99px; font-weight: 600; font-size: 14px; color: #fff; background: rgba(0, 0, 0, .72);
  border: 1px solid var(--shield); white-space: nowrap; max-width: 92%; overflow: hidden; text-overflow: ellipsis; }
.barrier[data-kind="units"], .barrier[data-kind="reach"] { --shield: #ffb020; }
.barrier[data-kind="writing"] { --shield: #38bdf8; }
.barrier[data-kind="safety"] { --shield: #ff2d6f; }
@keyframes shake { 10%, 90% { transform: translateX(-2px); } 20%, 80% { transform: translateX(4px); } 30%, 50%, 70% { transform: translateX(-7px); } 40%, 60% { transform: translateX(7px); } }
.shake { animation: shake .45s both; }

/* ---- URITP in colour (always on a dark background) --------------------------------------- */
.tk-kw { color: #ff9f0a; font-weight: 600; }
.tk-part { color: #64d2ff; }
.tk-place { color: #bf5af2; }
.tk-num { color: #30d158; font-weight: 600; }
.tk-str { color: #ffd60a; }
.tk-cmt { color: #7c7c84; font-style: italic; }

.rec-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--stop); }
#clipBtn.on { border-color: var(--stop); color: var(--stop); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

/* ---- bigger targets for fingers ----------------------------------------------------------------
   Small controls get at least 40px everywhere, and 44px (the size a finger needs) on touch screens. */
.icon-btn { width: 40px; height: 40px; }
.lang-select, .lang-pick select { min-height: 40px; }
.btn-sm { min-height: 40px; }
.linkish { padding: 8px 0; }
.example { padding: 9px 12px; min-height: 40px; }
@media (pointer: coarse) {
  .icon-btn { width: 44px; height: 44px; }
  .lang-select, .lang-pick select, .btn-sm, .btn, .example { min-height: 44px; }
  .linkish { padding: 12px 0; }
  .brand { min-height: 44px; }
}

/* the robot's moves, read out for screen readers (and shown nowhere) */
.live-caption { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---- the studio look (overrides the plainer rules above) ---------------------------------- */
body { background: radial-gradient(120% 70% at 70% -10%, rgba(80, 104, 190, .13), transparent 60%), var(--page) fixed; }
h1, h2, h3 { font-weight: 600; letter-spacing: -.02em; }
.hero h1, .page-head h1 { font-weight: 300; letter-spacing: -.035em; }
.hero h1 { font-size: clamp(40px, 5.4vw, 68px); line-height: 1.02; }
.kicker, .step-k { color: var(--blue); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; font-weight: 600; }
.brand-mark { border-radius: 50%; background: radial-gradient(circle at 35% 30%, #fff 0 8%, #c9d6ff 18%, #7d9bf5 52%, #2a3b7a 100%); box-shadow: 0 0 14px rgba(127, 155, 255, .55); }
.side { background: rgba(8, 9, 13, .78); }
.rail-glider { background: rgba(159, 183, 255, .12); box-shadow: inset 0 0 0 1px rgba(159, 183, 255, .28); }
.nav-btn.on, .nav-btn.on:hover { color: var(--text); }
.btn { border-radius: 999px; font-weight: 600; letter-spacing: -.005em; }
.btn-go { background: #e9eeff; color: #070910; }
.btn-go:hover { background: #fff; box-shadow: 0 0 0 4px rgba(159, 183, 255, .16); }
.btn-go:disabled { background: var(--surface-2); color: var(--faint); box-shadow: none; }
.btn-line { background: transparent; border-color: var(--line-2); }
.btn-line:hover { border-color: rgba(190, 205, 255, .36); background: rgba(159, 183, 255, .05); }
.mic { background: #e9eeff; color: #070910; }
.lrow.done .n { background: transparent; border-color: var(--go); color: var(--go); }
.bar i, .step-bar i, .su .su-bar i, .unit-bar i { background: linear-gradient(90deg, #7d9bf5, #c9d6ff); }
.next-card, .lesson-list, .card, .checker, .voice, .command, .hype, .lang-chip, .class-join, .badge.got, .skin, .world-card, .dlg { background: linear-gradient(180deg, rgba(255, 255, 255, .025), rgba(255, 255, 255, .008)), var(--surface); }
.badge.got b::before { content: none; }
.badge.got b { color: var(--text); }
.badge.got { box-shadow: inset 2px 0 0 var(--blue); }
.tk-kw { color: #9fb7ff; }
.tk-part { color: #7ee0d0; }
.tk-place { color: #d8b4fe; }
.tk-num { color: #ffcf7a; }
.tk-str { color: #f6f1d4; }
.tk-cmt { color: #5d6478; }
.cell { background: #07080b; box-shadow: 0 0 0 1px var(--line), 0 40px 90px -40px rgba(0, 0, 0, .9); }
.hero { grid-template-columns: minmax(0, .9fr) minmax(0, 1.25fr); gap: 40px; }
.hero-stage .cell { aspect-ratio: 5 / 4; }
.pane[data-pane="course"] { max-width: 1180px; }
.pane[data-pane="course"] .next-card, .pane[data-pane="course"] .units, .pane[data-pane="course"] .cert-band, .pane[data-pane="course"] .lang-note { max-width: 820px; }
.talk-right .cell { aspect-ratio: 4 / 3; }

/* the five worlds, as a numbered list of studio plates (no clip art) */
.worlds { grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; counter-reset: w; }
.world-card { counter-increment: w; padding: 20px 20px 18px; min-height: 170px; align-content: end; position: relative; overflow: hidden; }
.world-card::before { content: "0" counter(w); position: absolute; top: 16px; left: 20px; font: 500 12px/1 var(--mono); color: var(--faint); letter-spacing: .1em; }
.world-card::after { content: ""; position: absolute; right: -40px; top: -40px; width: 160px; height: 160px; border-radius: 50%;
  background: radial-gradient(circle, rgba(127, 155, 255, .22), transparent 65%); transition: transform .5s var(--ease), opacity .3s; opacity: .6; }
.world-card:hover::after { transform: scale(1.25); opacity: 1; }
.world-card b { font-size: 20px; font-weight: 500; letter-spacing: -.02em; }
.wc-art { display: none; }

/* names on the 3D model, and Elara's subtitles (js/learn3d.js puts them over the canvas) */
.cell canvas.is-3d { cursor: grab; touch-action: pan-y; }
.cell canvas.is-3d[data-dragging] { cursor: grabbing; }
.w3-overlay { position: absolute; inset: 0; pointer-events: none; overflow: hidden; font-family: var(--sans); }
.w3-tag { position: absolute; left: 0; top: 0; padding: 3px 8px; border-radius: 99px; white-space: nowrap; font-size: 11.5px; font-weight: 500; letter-spacing: .01em;
  color: #dfe5f5; background: rgba(8, 10, 15, .62); border: 1px solid rgba(190, 205, 255, .14); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  transition: opacity .25s; opacity: 0; }
.w3-thing { color: #fff; border-color: rgba(190, 205, 255, .28); }
.w3-nogo { color: #ffb3c1; border-color: rgba(255, 92, 122, .45); text-transform: uppercase; font-size: 10px; letter-spacing: .12em; font-weight: 600; }
.w3-sub { position: absolute; left: 0; top: 0; max-width: 70%; padding: 7px 14px; border-radius: 12px; font-size: 14px; font-weight: 500; line-height: 1.35; text-align: center;
  color: #fff; background: rgba(8, 10, 15, .74); border: 1px solid rgba(159, 183, 255, .35); opacity: 0; transition: opacity .25s; }
.w3-sub.on { opacity: 1; }
@media (max-width: 560px) { .w3-tag { font-size: 10.5px; padding: 2px 6px; } .w3-sub { font-size: 13px; } }

/* the certificate: Elara signs it in light */
.dlg { max-width: min(760px, 94vw); }
.cert-stage { position: relative; aspect-ratio: 16 / 8; border-radius: 12px; overflow: hidden; background: radial-gradient(80% 90% at 50% 20%, #141a2e, #05060a 70%); box-shadow: 0 0 0 1px var(--line); }
.cert-stage canvas { display: block; width: 100%; height: 100%; border: 0; border-radius: 0; }
.cert-stage:has(canvas[hidden]) { display: none; }
.cert-form .row { justify-content: flex-end; }
.bench { grid-template-columns: minmax(0, 1fr); }
@media (max-width: 1100px) { .hero { grid-template-columns: minmax(0, 1fr); gap: 22px; } .hero-stage { max-width: 680px; } }
@media (max-width: 760px) { .hero-stage .cell { aspect-ratio: 1 / 1; } .hero h1 { font-size: 44px; } }

/* developer access (the code SENTHU) */
.dev-skip { display: none; margin-left: auto; border-style: dashed; }
body.dev .dev-skip { display: inline-flex; }
body.dev .class-line b { color: var(--warn); font-weight: 600; }
.example.more { color: var(--blue); border-style: dashed; background: transparent; }

/* Elara's point of view (map worlds, while a program runs until Reset) */
.w3-overlay::before, .w3-overlay::after { content: ""; position: absolute; opacity: 0; transition: opacity .6s var(--ease); pointer-events: none; }
.w3-overlay::before { inset: 14px; border: 1px solid transparent;
  background:
    linear-gradient(var(--blue), var(--blue)) left top / 22px 1.5px no-repeat, linear-gradient(var(--blue), var(--blue)) left top / 1.5px 22px no-repeat,
    linear-gradient(var(--blue), var(--blue)) right top / 22px 1.5px no-repeat, linear-gradient(var(--blue), var(--blue)) right top / 1.5px 22px no-repeat,
    linear-gradient(var(--blue), var(--blue)) left bottom / 22px 1.5px no-repeat, linear-gradient(var(--blue), var(--blue)) left bottom / 1.5px 22px no-repeat,
    linear-gradient(var(--blue), var(--blue)) right bottom / 22px 1.5px no-repeat, linear-gradient(var(--blue), var(--blue)) right bottom / 1.5px 22px no-repeat;
  box-shadow: inset 0 0 120px rgba(40, 70, 160, .35); }
.w3-overlay::after { content: "ELARA · LIVE VIEW"; right: 26px; top: 22px; font: 600 11px/1 var(--mono); letter-spacing: .16em; color: var(--blue); padding-left: 14px;
  background: radial-gradient(circle, #ff5c7a 0 3.5px, transparent 4px) left center / 10px 10px no-repeat; }
.w3-overlay.pov::before, .w3-overlay.pov::after { opacity: 1; }
.w3-overlay.pov .w3-sub { transform: translate(-50%, 0) !important; left: 50%; top: auto; bottom: 18px; }
.w3-arm { color: #fff; border-color: rgba(159, 183, 255, .7); background: rgba(40, 60, 140, .55); font-family: var(--mono); font-size: 11px; letter-spacing: .04em; }

/* headings: bold and bright */
h1, h2, h3 { font-weight: 700; color: #fff; }
.hero h1, .page-head h1 { font-weight: 800; letter-spacing: -.04em; color: #fff; }
.lesson-title h1 { font-weight: 750; }
.card h3, .next-card h2, .unit h2, .sec-title { font-weight: 700; color: #fff; }

/* the BlackPearl ELARA brand (blackpearlelara.com/venture): Lexend, Sora for "URITP", the official mark */
img.brand-mark { width: 28px; height: 28px; border-radius: 0; background: none; box-shadow: none; filter: drop-shadow(0 0 10px rgba(127, 155, 255, .35)); }
.brand-name { display: inline-flex; align-items: center; gap: 7px; font-weight: 500; letter-spacing: -.01em; }
.brand-word { height: 19px; width: auto; display: block; transform: translateY(.5px); }
h1, h2, h3, .lesson-title h1 { font-weight: 600; letter-spacing: -.025em; }
.hero h1, .page-head h1 { font-weight: 700; letter-spacing: -.035em; }
.side-made { display: block; padding: 10px 10px 2px; opacity: .65; transition: opacity .2s; }
.side-made:hover { opacity: 1; }
.side-made img { height: 30px; width: auto; display: block; }
@media (max-width: 900px) { .side-made { display: none; } }