/* AI Labs: the pupil lab (lab.html) and the teacher console (labs.html).
   Big targets and plenty of space: pupils are 11 to 14 and often on Chromebooks. */
.labs-page { min-height: 100vh; }
.lab-top { background: var(--deep); color: #FFFFFF; position: sticky; top: 0; z-index: 5; }
.lab-top-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; min-height: 58px; padding-block: 8px; }
.lab-brand { font-family: var(--font-display); font-size: 1.25rem; font-weight: 600; }
.lab-brand b { color: var(--chalk); }
.lab-status { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.lab-nick { background: rgb(255 255 255 / .14); border-radius: 999px; padding: 4px 12px; font-weight: 600; }
.lab-time { font-family: var(--font-mono); font-size: .85rem; }
.lab-time.soon { color: var(--chalk); font-weight: 600; animation: lab-pulse 1.6s ease-in-out infinite; }
@keyframes lab-pulse { 50% { opacity: .55; } }
@media (prefers-reduced-motion: reduce) { .lab-time.soon { animation: none; } }
.lab-main { padding-block: 24px 64px; }

/* ---------- joining ---------- */
.lab-join { display: grid; place-items: center; min-height: 70vh; }
.lab-join-card {
  width: min(520px, 100%); text-align: center; background: var(--surface); border: 1px solid var(--line);
  border-radius: 24px; padding: 32px 22px; box-shadow: 0 18px 50px rgb(14 77 62 / .12);
}
.lab-join-art { font-size: 3rem; line-height: 1; }
.join-flag { display: inline-block; background: var(--chalk, #F4C842); color: #0E4D3E; font-weight: 700; border-radius: 999px; padding: 6px 14px; font-size: .9rem; }
.lab-join-card h1 { font-family: var(--font-display); margin: 12px 0 4px; font-size: 2rem; }
.lab-join-form { display: flex; gap: 10px; margin: 18px 0 8px; }
.lab-join-form input {
  flex: 1; min-width: 0; text-align: center; font-family: var(--font-mono); font-size: 1.7rem !important;
  letter-spacing: .25em; text-transform: uppercase; padding: 10px !important;
}
.lab-promises { list-style: none; padding: 0; margin: 18px 0 0; text-align: left; display: grid; gap: 8px; color: var(--muted); font-size: .95rem; }

/* ---------- the lab ---------- */
.lab-intro { max-width: 820px; margin-bottom: 18px; }
.lab-intro h1 { font-family: var(--font-display); font-size: clamp(1.8rem, 4vw, 2.5rem); margin: 0 0 6px; }
.lab-intro p { font-size: 1.08rem; margin: 0; }
.lab-card { margin-bottom: 14px; padding: 18px; }
.lab-step-head { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 12px; }
.lab-step-head h2 { margin: 0; font-size: 1.2rem; }
.lab-step-head p { margin: 2px 0 0; color: var(--muted); }
.lab-step-num {
  flex: none; width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; background: var(--soft); color: var(--accent);
  border: 2px solid var(--accent);
}
.lab-step-head.done .lab-step-num { background: var(--accent); color: var(--accent-ink); font-size: 0; }
.lab-step-head.done .lab-step-num::after { content: "✓"; font-size: 1.2rem; }
.lab-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 12px 0 0; }
.lab-source { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.lab-stage { display: grid; grid-template-columns: minmax(0, 280px) minmax(0, 1fr); gap: 18px; align-items: start; }
.lab-input { display: grid; gap: 8px; justify-items: start; }
.lab-input canvas, .lab-input video {
  width: 100%; max-width: 280px; aspect-ratio: 1; border-radius: 14px; border: 2px dashed var(--line); background: #FFFFFF; touch-action: none;
}
.lab-input video { object-fit: cover; border-style: solid; background: #000000; }
.lab-classes, .lab-text-classes { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.lab-class { border: 1px solid var(--line); border-radius: 12px; padding: 12px; display: grid; gap: 8px; align-content: start; background: var(--bg); min-width: 0; }
.lab-class h3 { margin: 0; font-size: 1.05rem; display: flex; justify-content: space-between; gap: 8px; align-items: baseline; }
.lab-class-name { font-weight: 600 !important; }
.lab-thumbs { display: flex; flex-wrap: wrap; gap: 4px; min-height: 40px; }
.lab-thumbs img { width: 40px; height: 40px; border-radius: 6px; border: 1px solid var(--line); background: #FFFFFF; }
.lab-add, .lab-test-form { display: flex; gap: 8px; }
.lab-add input, .lab-test-form input { flex: 1; min-width: 0; }
.lab-sentences { margin: 0; padding-left: 18px; font-size: .92rem; color: var(--muted); }
.lab-test { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 14px; align-items: start; }
.lab-guess { min-width: 0; }
.lab-guess:empty { display: none; }
#textGuess { margin-top: 12px; }
.lab-answer { font-size: 1.25rem; margin: 0 0 8px; }
.lab-answer b { color: var(--accent); }
.lab-bar { display: grid; grid-template-columns: minmax(70px, 120px) minmax(0, 1fr) 46px; gap: 8px; align-items: center; margin: 4px 0; font-size: .92rem; }
.lab-bar span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lab-bar-track { height: 14px; border-radius: 999px; background: var(--soft); overflow: hidden; }
.lab-bar-track span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--mint)); border-radius: inherit; transition: width .3s ease; }
.lab-bar b { text-align: right; font-family: var(--font-mono); font-weight: 500; }
.lab-guess .pill, .labs-console .pill { display: inline-block; background: var(--soft); border: 1px solid var(--line); border-radius: 999px; padding: 1px 9px; font-family: var(--font-mono); font-size: .82rem; color: var(--ink); }
.lab-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 12px; }
.lab-ended { border: 0; border-radius: 18px; padding: 24px; max-width: min(460px, calc(100vw - 32px)); background: var(--surface); color: var(--ink); }
.lab-ended::backdrop { background: rgb(8 32 26 / .55); }
.lab-ended h2 { margin-top: 0; font-family: var(--font-display); }

/* ---------- teacher console ---------- */
.labs-row { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
.labs-live { border: 2px solid var(--accent); }
.labs-code-box { display: flex; gap: 22px; flex-wrap: wrap; align-items: center; justify-content: space-between; }
.labs-code {
  font-family: var(--font-mono); font-weight: 500; font-size: clamp(2.6rem, 9vw, 4.6rem); letter-spacing: .14em;
  color: var(--accent); line-height: 1; user-select: all;
}
.labs-join-url { font-size: 1.2rem; margin: 6px 0 0; }
.labs-steps { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 6px; margin: 14px 0; }
.labs-steps div { background: var(--soft); border-radius: 8px; padding: 6px; text-align: center; font-size: .82rem; color: var(--muted); }
.labs-steps b { display: block; font-family: var(--font-display); font-size: 1.4rem; color: var(--accent); }
.labs-pupils { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; margin: 0; }
.labs-pupils li { border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px; font-size: .9rem; background: var(--bg); }
.labs-pupils li b { font-family: var(--font-mono); color: var(--accent); margin-left: 4px; }
.labs-buy-total { font-family: var(--font-display); font-size: 1.6rem; color: var(--accent); margin: 4px 0; }
.labs-note { border-left: 4px solid var(--chalk); background: color-mix(in srgb, var(--chalk) 14%, var(--surface)); padding: 10px 14px; border-radius: 0 10px 10px 0; margin: 0 0 14px; }

/* ---------- the school admin's Labs card (school.html) ---------- */
.labs-optin { display: grid; gap: 8px; margin: 12px 0; }
.labs-optin label { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
.labs-optin input { margin-top: 4px; width: 18px; height: 18px; flex: none; accent-color: var(--accent); }
.labs-state { display: inline-block; border-radius: 999px; padding: 2px 10px; font-weight: 600; font-size: .85rem; background: var(--soft); }
.labs-state.on { background: var(--accent); color: var(--accent-ink); }

@media (max-width: 700px) {
  .lab-stage, .lab-test { grid-template-columns: minmax(0, 1fr); }
  .lab-input { justify-items: stretch; }
  .lab-input canvas, .lab-input video { max-width: none; }
  .lab-join-form { flex-direction: column; }
  .labs-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lab-top { position: static; }
}

/* ---------- the lesson (lab.html) ---------- */
.lab-brand { display: inline-flex; align-items: center; gap: 8px; }
.lab-brand img { border-radius: 9px; }
.lab-join-art { width: 120px; height: 120px; border-radius: 26px; box-shadow: 0 10px 26px rgb(14 77 62 / .25); }
.lab-xp { background: var(--chalk); color: var(--chalk-ink); border-radius: 999px; padding: 4px 12px; font-weight: 700; font-size: .92rem; }
.lab-rank { font-weight: 400; font-size: .8rem; margin-left: 4px; opacity: .85; }
.lab-a11y-btn { background: rgb(255 255 255 / .12); color: #FFFFFF; border-color: rgb(255 255 255 / .35); }
.lab-step-kicker { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.lab-step-head > div { flex: 1; min-width: 0; }
.lab-say { display: none; flex: none; padding: 4px 8px; }
.a11y-speak .lab-say { display: inline-block; }
.lab-q { border-top: 1px dashed var(--line); padding: 12px 0; }
.lab-q:first-child { border-top: 0; padding-top: 0; }
.lab-q-text { font-size: 1.05rem; margin: 0 0 8px; }
.lab-options { display: grid; gap: 8px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.lab-options button, .lab-chips button[data-actual], .lab-chips button[data-guess] { text-align: left; padding: 10px 12px; font-weight: 600; line-height: 1.3; }
button.right { background: #D7F0E4; border-color: var(--accent); color: #0E4D3E; opacity: 1 !important; }
button.wrong { background: #FBE3DF; border-color: var(--danger); color: #7A1B14; opacity: 1 !important; }
button.truth { box-shadow: inset 0 0 0 2px var(--mint); }
.lab-feedback { margin: 8px 0 0; font-weight: 600; }
.lab-feedback:empty { display: none; }
.lab-sort { display: grid; gap: 6px; }
.lab-sort-row { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; justify-content: space-between; background: var(--bg); border-radius: 10px; padding: 6px 10px; }
.lab-sort-row > span:first-child { flex: 1 1 180px; font-weight: 600; }
.lab-sort-mark { font-size: .9rem; color: var(--muted); }
.lab-kw { display: grid; gap: 8px; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); margin-bottom: 14px; }
.lab-kw-card { border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; background: var(--bg); display: grid; gap: 2px; }
.lab-kw-card b { color: var(--accent); }
.lab-kw-card span { font-size: .92rem; }
.lab-game { border: 2px dashed var(--chalk); border-radius: 14px; padding: 14px; background: color-mix(in srgb, var(--chalk) 10%, var(--surface)); }
.lab-game-def { font-size: 1.1rem; font-style: italic; }
.lab-checks { list-style: none; padding: 0; margin: 10px 0; display: grid; gap: 4px; font-size: .95rem; }
.lab-checks li.ok { color: var(--accent); font-weight: 600; }
.lab-stats { margin-top: 12px; }
.lab-stats:empty { display: none; }
.lab-matrix-wrap { overflow-x: auto; margin: 8px 0; }
.lab-matrix { border-collapse: collapse; font-size: .92rem; min-width: 260px; }
.lab-matrix caption { text-align: left; font-size: .82rem; color: var(--muted); padding-bottom: 4px; caption-side: top; }
.lab-matrix th, .lab-matrix td { border: 1px solid var(--line); padding: 6px 10px; text-align: center; }
.lab-matrix th { background: var(--soft); font-weight: 600; }
.lab-matrix td { font-family: var(--font-mono); font-size: 1.05rem; min-width: 56px; }
.lab-matrix td.hit { background: #D7F0E4; color: #0E4D3E; font-weight: 600; }
.lab-matrix td.miss { background: #FCE9B8; color: #5B4300; font-weight: 600; }
.lab-k { margin-bottom: 8px; }
.lab-bench { display: flex; flex-wrap: wrap; gap: 14px; }
.lab-inside { margin-top: 12px; }
.lab-inside:empty { display: none; }
.lab-inside h3 { font-size: 1rem; margin: 0 0 6px; }
.lab-calc-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.lab-calc input { max-width: 110px; }
.lab-calc-mark { font-weight: 600; }
.lab-tiers { display: grid; gap: 14px; }
.lab-tier { border: 2px solid var(--line); border-radius: 16px; padding: 16px; background: var(--bg); }
.lab-tier header { position: relative; }
.lab-tier h3 { margin: 6px 0 4px; font-size: 1.25rem; }
.lab-tier header p { margin: 0 0 10px; }
.lab-tier-badge { display: inline-block; border-radius: 999px; padding: 3px 12px; font-weight: 700; font-size: .85rem; }
.lab-tier-bronze { border-color: #D9A27A; } .lab-tier-bronze .lab-tier-badge { background: #F4D9C4; color: #5A2E0E; }
.lab-tier-silver { border-color: #A9B4B8; } .lab-tier-silver .lab-tier-badge { background: #E3E8EA; color: #2B3538; }
.lab-tier-gold { border-color: var(--chalk); } .lab-tier-gold .lab-tier-badge { background: var(--chalk); color: var(--chalk-ink); }
.lab-tier.complete { background: color-mix(in srgb, var(--mint) 10%, var(--surface)); }
.lab-rec { margin-left: 8px; font-size: .82rem; font-weight: 700; color: var(--accent); }
.lab-result { font-weight: 600; color: var(--accent); margin: 6px 0; }
.lab-result:empty { display: none; }
.lab-hints { list-style: none; padding: 0; margin: 0 0 6px; display: grid; gap: 4px; }
.lab-tier-status { font-weight: 700; color: var(--accent); }
.lab-kw-used { display: flex; flex-wrap: wrap; gap: 6px; }
.lab-kw-used .pill.used { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.lab-prompts { background: var(--bg); border-radius: 12px; padding: 10px 14px; margin-bottom: 10px; }
.lab-prompts ol { margin: 6px 0 0; padding-left: 20px; }
.lab-rubric-wrap { overflow-x: auto; }
.lab-rubric { border-collapse: collapse; width: 100%; min-width: 640px; font-size: .88rem; }
.lab-rubric th, .lab-rubric td { border: 1px solid var(--line); padding: 8px; vertical-align: top; text-align: left; }
.lab-rubric th[scope="row"] { width: 20%; background: var(--bg); }
.lab-rubric th[scope="row"] .fine { display: block; font-weight: 400; margin-top: 2px; }
.lab-rubric td { color: var(--muted); }
.lab-rubric td.got { color: var(--ink); font-weight: 700; }
.lab-level-1 { background: #F9D6D0; color: #6B1C12; } .lab-level-2 { background: #FCE9B8; color: #5B4300; }
.lab-level-3 { background: #D7F0E4; color: #0E4D3E; } .lab-level-4 { background: #B8E6CF; color: #0A3A2F; }
.lab-rubric tr:first-child th { text-align: center; }
.lab-level { border-radius: 8px; padding: 2px 10px; }
.lab-world { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.lab-world div { background: var(--bg); border-radius: 12px; padding: 10px 12px; display: grid; gap: 2px; }
.lab-bottom { justify-content: center; margin-top: 18px; }
.lab-toasts { position: fixed; right: 16px; bottom: 16px; display: grid; gap: 8px; z-index: 50; pointer-events: none; }
.lab-toast { background: var(--deep); color: #FFFFFF; border-left: 5px solid var(--chalk); border-radius: 10px; padding: 10px 14px; font-weight: 600; box-shadow: 0 10px 26px rgb(0 0 0 / .25); animation: lab-pop .3s ease; }
@keyframes lab-pop { from { transform: translateY(10px); opacity: 0; } }
/* Phishing detective */
.lab-inbox { display: grid; gap: 10px; }
.lab-msg { border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; background: var(--surface); }
.lab-msg p { margin: 0 0 6px; }
.lab-msg-from { font-family: var(--font-mono); font-size: .82rem; color: var(--muted); word-break: break-all; }
.lab-msg-subject { font-weight: 700; }
.lab-msg-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.lab-flag-chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 0; }
.lab-flag-chips button[aria-pressed="true"] { background: var(--soft); border-color: var(--accent); }
.lab-msg-verdict { font-weight: 600; }
.lab-msg-verdict.blocked { color: var(--danger); }
.lab-hunt p { line-height: 2.1; }
.lab-hunt-part { display: inline; padding: 2px 4px; border-radius: 4px; font-weight: 400; font-size: inherit; border-style: dashed; }
/* Accessibility dialog and modes */
.lab-a11y .seg { margin: 0 0 12px; }
.lab-a11y [aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.lab-a11y-toggles { display: grid; gap: 6px; margin-bottom: 12px; }
.lab-a11y-toggles button { text-align: left; }
.a11y-big button, .a11y-big .btn { padding: 12px 18px !important; font-size: 1.05rem !important; min-height: 48px; }
.a11y-big .lab-step-num { width: 50px; height: 50px; font-size: 1.4rem; }
.a11y-big .lab-thumbs img { width: 56px; height: 56px; }
.a11y-big input, .a11y-big textarea, .a11y-big select { font-size: 1.1rem !important; padding: 12px !important; }
.a11y-contrast { --bg: #FFFFFF; --surface: #FFFFFF; --ink: #000000; --muted: #1F1F1F; --line: #000000; --accent: #004D33; --soft: #E6F2EC; }
.a11y-contrast .panel, .a11y-contrast .lab-tier, .a11y-contrast .lab-msg { border-width: 2px; }
.a11y-contrast .lab-hero { background: #002B1E; }
.a11y-readable { --font-body: Verdana, Tahoma, sans-serif; --font-display: Verdana, Tahoma, sans-serif; }
.a11y-readable .lab-main { letter-spacing: .03em; word-spacing: .12em; line-height: 1.8; }
.a11y-readable .lab-main p, .a11y-readable .lab-main li { max-width: 70ch; }
.a11y-calm *, .a11y-calm *::before, .a11y-calm *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
@media print {
  .lab-top, .lab-toasts, .lab-say, .lab-bottom { display: none !important; }
}
/* Teacher console additions */
.labs-mission { display: block; font-family: var(--font-mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.labs-pupils li { display: inline-flex; gap: 6px; align-items: center; }
.labs-quiz { font-family: var(--font-mono); font-size: .78rem; color: var(--muted); }
.labs-steps { grid-template-columns: repeat(8, minmax(0, 1fr)); }
@media (max-width: 700px) { .labs-steps { grid-template-columns: repeat(4, minmax(0, 1fr)); } }

/* ================= Pupil lab v3: one step at a time, colourful ================= */
.labs-page .lab-main { max-width: 1180px; }
/* Lessonsmith colours only: greens with a gold accent. */
.lab-c1, .lab-c2, .lab-c3, .lab-c4, .lab-c5, .lab-c6, .lab-c7,
.lab-map-1, .lab-map-2, .lab-map-3, .lab-map-4, .lab-map-5, .lab-map-6, .lab-map-7 { --step: #137A5E; }
.labs-page .lab-main { font-size: 1.06rem; }
.lab-screen { animation: lab-in .35s ease; }
@keyframes lab-in { from { opacity: 0; transform: translateY(10px); } }
/* Start screen */
.lab-start {
  position: relative; text-align: center; color: #FFFFFF; border-radius: 28px; padding: clamp(24px, 5vw, 44px) 20px; overflow: hidden;
  background: radial-gradient(420px 260px at 85% 0%, rgb(244 200 66 / .35), transparent 70%), radial-gradient(420px 300px at 0% 100%, rgb(45 190 143 / .45), transparent 70%), linear-gradient(135deg, var(--deep), var(--accent));
}
.lab-start img { border-radius: 26px; box-shadow: 0 12px 30px rgb(0 0 0 / .3); }
.lab-mission { display: inline-block; margin-top: 12px; font-family: var(--font-mono); font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; color: var(--chalk-ink); background: var(--chalk); border-radius: 999px; padding: 4px 12px; }
.lab-start h1 { font-family: var(--font-display); font-size: clamp(2rem, 6vw, 3.2rem); margin: 10px 0 8px; }
.lab-start-intro { max-width: 640px; margin: 0 auto 18px; font-size: 1.1rem; color: #D9F1E8; }
.lab-goals { max-width: 560px; margin: 0 auto 14px; text-align: left; background: rgb(255 255 255 / .12); border: 1px solid rgb(255 255 255 / .25); border-radius: 18px; padding: 14px 20px; }
.lab-goals ul { margin: 6px 0 0; padding-left: 20px; }
.lab-why { color: var(--chalk); font-weight: 600; margin: 0 0 18px; }
.lab-go { font-size: 1.3rem !important; padding: 16px 34px !important; }
.lab-start .lab-say { position: absolute; top: 14px; right: 14px; }
/* Step tracker */
.lab-map { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; margin: 0 0 14px; }
.lab-map button { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 8px 2px; border-radius: 16px; border: 2px solid transparent; background: var(--surface); font-size: .78rem; font-weight: 600; color: var(--ink); position: relative; }
.lab-map button b { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; font-size: 1.25rem; background: color-mix(in srgb, var(--step) 16%, var(--surface)); }
.lab-map button.here { border-color: var(--chalk); background: #FFF8DC; box-shadow: 0 4px 14px rgb(244 200 66 / .3); }
.lab-map button.done::after { content: "✓"; position: absolute; top: 2px; right: 8px; width: 20px; height: 20px; border-radius: 50%; background: var(--step); color: #FFFFFF; font-size: .75rem; display: grid; place-items: center; }
/* Step cards */
.lab-card { border-top: 6px solid var(--accent); border-radius: 24px; padding: clamp(18px, 3.4vw, 34px); box-shadow: 0 8px 26px rgb(14 77 62 / .07); }
.lab-step-num { width: 56px; height: 56px; font-size: 1.7rem; border: 0; background: color-mix(in srgb, var(--step, var(--accent)) 16%, var(--surface)); }
.lab-step-head.done .lab-step-num { background: var(--step, var(--accent)); }
.lab-step-head h2 { font-family: var(--font-display); font-size: clamp(1.4rem, 3vw, 1.8rem); }
.lab-step-kicker { color: var(--accent); font-weight: 600; }
.lab-do { font-size: 1.15rem; font-weight: 600; color: var(--ink) !important; }
.lab-help { margin: -2px 0 14px; }
.lab-help summary { display: inline-block; cursor: pointer; list-style: none; background: color-mix(in srgb, var(--chalk) 28%, var(--surface)); border-radius: 999px; padding: 6px 14px; font-weight: 600; font-size: .92rem; }
.lab-help summary::-webkit-details-marker { display: none; }
.lab-help[open] > p, .lab-help[open] > ol { background: color-mix(in srgb, var(--chalk) 12%, var(--surface)); border-radius: 12px; padding: 10px 14px 10px 30px; margin: 8px 0 0; }
.lab-help[open] > p { padding-left: 14px; }
.lab-nav { display: flex; justify-content: space-between; gap: 10px; margin-top: 22px; padding-top: 16px; border-top: 2px dashed var(--line); }
.lab-nav button { min-width: 120px; padding: 12px 18px; font-size: 1rem; }
.lab-nav .cta.ready { animation: lab-glow 1.6s ease-in-out infinite; }
@keyframes lab-glow { 50% { box-shadow: 0 0 0 8px rgb(244 200 66 / .35), 0 6px 18px rgb(244 200 66 / .45); } }
/* Colourful answers */
.lab-options button { display: flex; align-items: center; gap: 10px; min-height: 58px; border: 0; border-radius: 16px; color: #FFFFFF; font-weight: 700; font-size: 1rem; box-shadow: 0 4px 0 rgb(0 0 0 / .18); transition: transform .12s ease; }
.lab-options button:nth-child(4n+1) { background: #0E4D3E; } .lab-options button:nth-child(4n+2) { background: #137A5E; }
.lab-options button:nth-child(4n+3) { background: #F4C842; color: #1B1A12; }
.lab-options button:nth-child(4n+4) { background: #FFFFFF; color: #0E4D3E; box-shadow: inset 0 0 0 3px #137A5E, 0 4px 0 rgb(0 0 0 / .12); }
.lab-options button:hover:not(:disabled) { transform: translateY(-2px); filter: brightness(1.08); }
.lab-options button:active:not(:disabled) { transform: translateY(2px); box-shadow: 0 2px 0 rgb(0 0 0 / .18); }
.lab-options button i { font-style: normal; font-size: 1.2rem; opacity: .85; }
.lab-options button:disabled { opacity: .35; }
.lab-options button.right, .lab-options button.wrong { opacity: 1 !important; }
.lab-options button.right { background: #137A5E !important; color: #FFFFFF; box-shadow: 0 0 0 4px #9BE3C6; }
.lab-options button.right::after { content: "✓"; margin-left: auto; font-size: 1.3rem; }
.lab-options button.wrong { background: #B3261E !important; color: #FFFFFF; }
.lab-options button.wrong::after { content: "✗"; margin-left: auto; font-size: 1.3rem; }
.lab-q-big { font-size: 1.35rem; font-weight: 700; }
.lab-feedback { font-size: 1.02rem; }
.lab-progress { display: block; height: 12px; background: var(--soft); border-radius: 999px; overflow: hidden; margin: 0 0 12px; }
.lab-progress > span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--mint)); border-radius: inherit; transition: width .4s ease; }
.lab-meter { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; font-weight: 600; margin: 12px 0; }
.lab-meter .lab-progress { flex: 1 1 160px; margin: 0; }
.lab-big-score { font-family: var(--font-display); font-weight: 800; font-size: clamp(2.4rem, 7vw, 3.4rem); text-align: center; color: var(--accent); margin: 6px 0; line-height: 1.15; }
.lab-quiz-done { text-align: center; padding: 10px 0; }
/* Keyword flip cards */
.lab-kw { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
.lab-flip { position: relative; min-height: 118px; padding: 12px; border: 0; border-radius: 18px; color: #FFFFFF; font-weight: 700; display: grid; place-items: center; text-align: center; box-shadow: 0 4px 0 rgb(0 0 0 / .15); }
.lab-flip-0, .lab-flip-3 { background: #0E4D3E; } .lab-flip-1, .lab-flip-4 { background: #137A5E; }
.lab-flip-2 { background: #F4C842; color: #1B1A12; }
.lab-flip-front { display: grid; gap: 6px; font-size: 1.08rem; }
.lab-flip-front small { font-weight: 400; font-size: .75rem; opacity: .85; }
.lab-flip-back { display: none; font-weight: 600; font-size: .92rem; line-height: 1.35; }
.lab-flip.flipped { background: var(--surface); color: var(--ink); box-shadow: inset 0 0 0 3px currentColor; animation: lab-flip .35s ease; }
.lab-flip.flipped .lab-flip-front { display: none; }
.lab-flip.flipped .lab-flip-back { display: block; }
@keyframes lab-flip { from { transform: rotateY(90deg); } }
.lab-game-title { margin: 18px 0 8px; font-size: 1.2rem; }
.lab-game { border-style: solid; border-color: color-mix(in srgb, var(--step) 40%, var(--surface)); background: color-mix(in srgb, var(--step) 6%, var(--surface)); }
/* Challenge picker */
.lab-tier-pick { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin-bottom: 14px; }
.lab-tier-pick button { display: grid; gap: 4px; justify-items: center; text-align: center; padding: 14px 8px; border-radius: 18px; border: 3px solid var(--line); background: var(--surface); color: var(--ink); }
.lab-tier-pick button span:not(.lab-pick-icon):not(.lab-pick-done) { font-weight: 400; font-size: .88rem; color: var(--muted); }
.lab-pick-icon { font-size: 2.3rem; line-height: 1; }
.lab-tier-pick em { font-style: normal; font-size: .8rem; font-weight: 700; color: var(--accent); }
.lab-pick-done { font-size: .85rem; color: var(--accent); }
.lab-pick-bronze[aria-selected="true"] { border-color: #D9A27A; background: #FBEFE6; }
.lab-pick-silver[aria-selected="true"] { border-color: #A9B4B8; background: #F0F3F4; }
.lab-pick-gold[aria-selected="true"] { border-color: var(--chalk); background: #FFF6D6; }
.lab-tier { border-radius: 20px; }
.lab-hint-btn { background: color-mix(in srgb, var(--chalk) 28%, var(--surface)); border-color: transparent; }
.lab-starters button { background: color-mix(in srgb, var(--step) 10%, var(--surface)); border-color: color-mix(in srgb, var(--step) 35%, var(--surface)); }
/* Finish */
.lab-celebrate { text-align: center; background: linear-gradient(135deg, #FFF6D6, #E1F4EB); border-top-color: var(--chalk); }
.lab-celebrate h2 { font-family: var(--font-display); font-size: clamp(1.6rem, 4vw, 2.2rem); margin: 0 0 8px; }
.lab-celebrate-stats span { display: inline-block; margin: 4px; padding: 6px 14px; border-radius: 999px; background: #FFFFFF; font-weight: 700; }
.lab-finish .lab-card { margin-bottom: 14px; }
/* Nudge: a shimmering glow and sparkle on what to do next */
.lab-nudge { position: relative; outline: 3px solid var(--chalk) !important; outline-offset: 3px; animation: lab-nudge 1.3s ease-in-out infinite; }
@keyframes lab-nudge { 0%, 100% { box-shadow: 0 0 0 0 rgb(244 200 66 / .75); } 50% { box-shadow: 0 0 0 14px rgb(244 200 66 / 0); } }
button.lab-nudge::before { content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; background: linear-gradient(110deg, transparent 35%, rgb(255 255 255 / .65) 50%, transparent 65%); background-size: 250% 100%; animation: lab-sweep 1.4s linear infinite; }
button.lab-nudge::after { content: "✨"; position: absolute; top: -16px; right: -10px; font-size: 1.3rem; animation: lab-twinkle 1s ease-in-out infinite; }
@keyframes lab-sweep { from { background-position: 150% 0; } to { background-position: -150% 0; } }
@keyframes lab-twinkle { 50% { transform: scale(.6) rotate(20deg); opacity: .4; } }
@media (max-width: 700px) {
  .lab-map { gap: 4px; }
  .lab-map button { padding: 6px 0; }
  .lab-map button span { display: none; }
  .lab-map button b { width: 34px; height: 34px; font-size: 1.05rem; }
  .lab-tier-pick button span:not(.lab-pick-icon):not(.lab-pick-done) { display: none; }
  .lab-nav button { min-width: 0; flex: 1; }
}
.lab-start img { display: block; margin: 0 auto; }
.lab-ask > span { display: block; font-weight: 700; font-size: 1.05rem; margin-bottom: 6px; }
.lab-future .pill, .lab-kw-used .pill { display: inline-block; background: var(--soft); border: 1px solid var(--line); border-radius: 999px; padding: 3px 12px; font-size: .9rem; margin: 2px 0; }
.lab-sort-row .seg button[data-v="share"]:not(:disabled) { color: #137A5E; }
.lab-sort-row .seg button[data-v="private"]:not(:disabled) { color: #0E4D3E; }
.lab-sort-row .seg button.right { background: #137A5E; color: #FFFFFF; }
.lab-sort-row .seg button.wrong { background: #B3261E; color: #FFFFFF; }

/* ================= Teacher console: roomy, full width, Lessonsmith colours ================= */
.labs-console { padding-block: 26px 80px; font-size: 1.06rem; }
.labs-hero {
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 28px; align-items: center; margin-bottom: 26px;
  padding: clamp(24px, 4vw, 44px); border-radius: 28px; color: #FFFFFF; position: relative; overflow: hidden;
  background:
    radial-gradient(420px 260px at 92% 8%, rgb(244 200 66 / .32), transparent 70%),
    radial-gradient(520px 320px at 6% 100%, rgb(45 190 143 / .42), transparent 70%),
    linear-gradient(135deg, var(--deep), var(--accent));
}
.labs-hero-icon { width: 120px; height: 120px; border-radius: 28px; box-shadow: 0 14px 34px rgb(0 0 0 / .3); }
.labs-hero-flag { display: inline-block; font-family: var(--font-mono); font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; background: var(--chalk); color: var(--chalk-ink); border-radius: 999px; padding: 5px 12px; }
.labs-hero h1 { font-family: var(--font-display); font-size: clamp(2.2rem, 5vw, 3.4rem); margin: 10px 0 6px; line-height: 1.05; }
.labs-hero p { margin: 0; font-size: 1.15rem; color: #DDF3EA; max-width: 720px; }
.labs-hero p.plan-teachers { margin-top: 12px; font-size: 1rem; background: rgba(255,255,255,.1); border-left: 4px solid var(--chalk); border-radius: 12px; padding: 10px 14px; color: #fff; }
.labs-hero-chips { list-style: none; padding: 0; margin: 16px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.labs-hero-chips li { background: rgb(255 255 255 / .14); border: 1px solid rgb(255 255 255 / .3); border-radius: 999px; padding: 6px 14px; font-weight: 600; font-size: .95rem; }
.labs-seats { align-self: end; margin: 0; background: #FFFFFF; color: var(--deep); border-radius: 16px; padding: 12px 16px; font-weight: 600; max-width: 260px; }
.labs-seats:empty { display: none; }
.labs-section { background: var(--surface); border: 1px solid var(--line); border-radius: 24px; padding: clamp(20px, 3vw, 34px); margin-bottom: 22px; box-shadow: 0 8px 26px rgb(14 77 62 / .06); }
.labs-section-title { display: flex; align-items: center; gap: 14px; font-family: var(--font-display); font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 20px; }
.labs-num { flex: none; width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center; background: var(--accent); color: var(--accent-ink); font-size: 1.3rem; }
/* 1. Choose a lab: three big cards across the page */
.labs-pick { display: grid; gap: 18px; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0; }
.labs-mission-pick { display: block; cursor: pointer; font-weight: 400; position: relative; }
.labs-mission-pick input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.labs-option {
  display: grid; gap: 8px; align-content: start; height: 100%; padding: 22px; border-radius: 22px;
  border: 3px solid var(--line); background: var(--bg); transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.labs-mission-pick:hover .labs-option { border-color: var(--mint); transform: translateY(-2px); }
.labs-mission-pick input:checked + .labs-option { border-color: var(--accent); background: var(--soft); box-shadow: 0 10px 26px rgb(19 122 94 / .18); }
.labs-mission-pick input:focus-visible + .labs-option { outline: 3px solid var(--chalk); outline-offset: 3px; }
.labs-option-icon { width: 76px; height: 76px; border-radius: 22px; display: grid; place-items: center; font-size: 2.6rem; background: #FFFFFF; box-shadow: 0 4px 12px rgb(14 77 62 / .12); }
.labs-option b { font-family: var(--font-display); font-size: 1.5rem; line-height: 1.15; }
.labs-option .labs-mission { font-size: .78rem; color: var(--accent); }
.labs-option-text { color: var(--muted); font-size: 1.02rem; line-height: 1.5; }
.labs-option-check { display: none; justify-self: start; background: var(--accent); color: var(--accent-ink); border-radius: 999px; padding: 4px 12px; font-weight: 700; font-size: .85rem; }
.labs-mission-pick input:checked + .labs-option .labs-option-check { display: inline-block; }
/* 2. Set up your class */
.labs-setup { display: grid; gap: 18px; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr); align-items: end; }
.labs-years { border: 0; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.labs-years legend { grid-column: 1 / -1; margin-bottom: 8px; }
.labs-years label { display: block; cursor: pointer; position: relative; }
.labs-years input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.labs-years span { display: block; text-align: center; padding: 14px 8px; border-radius: 16px; border: 3px solid var(--line); background: var(--bg); font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; }
.labs-years input:checked + span { border-color: var(--accent); background: var(--accent); color: var(--accent-ink); }
.labs-years input:focus-visible + span { outline: 3px solid var(--chalk); outline-offset: 3px; }
.labs-setup select, .labs-setup input[type="number"] { font-size: 1.1rem !important; padding: 14px 12px !important; border-radius: 14px; border-width: 2px; }
.labs-start-row { margin: 24px 0 0; }
.labs-start-row .cta { font-size: 1.25rem; padding: 16px 30px; }
/* 3. Lesson plan */
.labs-plan-actions { display: flex; flex-wrap: wrap; gap: 12px 16px; align-items: center; margin: 0 0 20px; }
.labs-plan-actions .btn.big { font-size: 1.08rem; padding: 14px 22px; }
.labs-plan-grid { display: grid; gap: 18px; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-bottom: 18px; }
.labs-plan-card { background: var(--bg); border: 1px solid var(--line); border-top: 5px solid var(--accent); border-radius: 18px; padding: 18px 20px; }
.labs-plan-card h3 { font-family: var(--font-display); font-size: 1.25rem; margin: 0 0 10px; }
.labs-plan-card ul { margin: 0; padding-left: 20px; display: grid; gap: 8px; }
.labs-plan-steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; counter-reset: step; }
.labs-plan-steps li { display: flex; justify-content: space-between; gap: 10px; background: #FFFFFF; border-radius: 10px; padding: 8px 12px; counter-increment: step; }
.labs-plan-steps li span::before { content: counter(step) ". "; font-weight: 700; color: var(--accent); }
.labs-plan-steps li b { color: var(--accent); font-weight: 600; white-space: nowrap; }
.labs-plan-tiers { list-style: none !important; padding: 0 !important; }
.labs-plan-tiers li { background: #FFFFFF; border-radius: 10px; padding: 10px 12px; }
.labs-plan-kw { border-top-color: var(--chalk); margin-bottom: 14px; }
.labs-plan-kw .pill { display: inline-block; margin: 3px 2px; background: #FFFFFF; border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: .95rem; }
.labs-rec { background: var(--chalk); color: var(--chalk-ink); border-radius: 6px; padding: 1px 8px; font-size: .8rem; font-weight: 700; }
/* 4. Before you start */
.labs-tiles { display: grid; gap: 16px; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.labs-tile { background: var(--bg); border-radius: 18px; padding: 20px; display: grid; gap: 6px; align-content: start; }
.labs-tile > span { font-size: 2.2rem; }
.labs-tile b { font-size: 1.12rem; }
.labs-tile p { margin: 0; color: var(--muted); }
/* Live session */
.labs-live { border-radius: 24px; padding: clamp(20px, 3vw, 32px); border-width: 3px; }
.labs-pupils li { font-size: 1rem; padding: 6px 12px; }
@media (max-width: 960px) {
  .labs-hero { grid-template-columns: auto minmax(0, 1fr); }
  .labs-seats { grid-column: 1 / -1; max-width: none; }
  .labs-plan-grid { grid-template-columns: minmax(0, 1fr); }
  .labs-pick { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .labs-setup { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .labs-years { grid-column: 1 / -1; }
  .labs-tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .labs-hero { grid-template-columns: minmax(0, 1fr); text-align: left; }
  .labs-hero-icon { width: 84px; height: 84px; }
  .labs-setup, .labs-tiles { grid-template-columns: minmax(0, 1fr); }
}
.labs-hero .labs-seats { color: var(--deep); }
@media (max-width: 600px) { .labs-pick { grid-template-columns: minmax(0, 1fr); } }
@media (min-width: 961px) and (max-width: 1300px) { .labs-pick { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* Verifying pupils' coins */
.labs-verify { width: min(560px, calc(100vw - 32px)); }
.labs-verify-tools { display: flex; gap: 8px; flex-wrap: wrap; }
.labs-verify-list { list-style: none; padding: 0; margin: 8px 0; max-height: 50vh; overflow: auto; border: 1px solid var(--line); border-radius: 14px; }
.labs-verify-list li { border-bottom: 1px solid var(--line); }
.labs-verify-list li:last-child { border-bottom: 0; }
.labs-verify-list label { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 10px 12px; min-height: 44px; cursor: pointer; }
.labs-verify-list input { width: 22px; height: 22px; }
.labs-verify-list b { font-family: var(--font-mono); color: var(--accent); }

/* Pupil sign-in panel (school page): new, so it's edged in gold. */
.pupil-panel { border: 2px solid #F4C842; }
.pupil-points { list-style: none; padding: 0; margin: 10px 0; display: grid; gap: 6px; font-weight: 600; color: #0E4D3E; }
.pupil-panel label input[type=text] { width: 100%; min-height: 44px; }
.labs-celebrate { display: flex; gap: 10px; align-items: flex-start; margin-top: 16px; font-weight: 600; }
.labs-celebrate input { width: 22px; height: 22px; flex: none; accent-color: var(--accent); }

/* Phones: the header's buttons sit in one row that scrolls sideways, so the header
   stays one or two lines high instead of four. */
@media (max-width: 640px) {
  .lab-top-row { flex-wrap: nowrap; flex-direction: column; align-items: stretch; gap: 6px; }
  .lab-status { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; padding-bottom: 2px; -webkit-overflow-scrolling: touch; }
  .lab-status::-webkit-scrollbar { display: none; }
  .lab-status > * { flex: none; }
}
/* Messages appear at the top of the screen, clear of answer buttons. */
.lab-toasts { top: 72px; bottom: auto; }
@media (max-width: 640px) { .lab-toasts { top: 8px; left: 8px; right: 8px; } }
@media (prefers-reduced-motion: reduce) { .lab-toast { animation: none; } }

/* Phones: a shorter hero, so the page's own content starts on the first screen. */
@media (max-width: 600px) {
  .labs-hero { gap: 14px; padding: 22px 18px; border-radius: 22px; margin-bottom: 18px; }
  .labs-hero-icon { width: 56px; height: 56px; border-radius: 16px; }
  .labs-hero h1 { font-size: 2rem; }
  .labs-hero p { font-size: 1.02rem; }
  .labs-hero-flag { font-size: .7rem; letter-spacing: .06em; }
  .labs-hero-chips { display: none; }
}

/* Phones: tool pages open straight onto the tools. The hero keeps just its icon and title;
   the flag, the chips and the long introduction are left for bigger screens. */
@media (max-width: 700px) {
  .labs-hero { grid-template-columns: auto minmax(0, 1fr); align-items: center; padding: 16px; gap: 12px; }
  .labs-hero > .labs-seats { grid-column: 1 / -1; }
  .labs-hero-icon { width: 56px; height: 56px; border-radius: 16px; }
  .labs-hero-flag, .labs-hero-chips, .labs-hero p:not(.labs-seats) { display: none; }
  .labs-hero h1 { font-size: 1.8rem; margin: 0; }
  .labs-hero.rv-hero { grid-template-columns: auto minmax(0, 1fr); }
  .labs-hero .rv-hero-icon { width: 56px; height: 56px; font-size: 1.6rem; border-radius: 16px; }
}