/* STEM Lab — palette matches aotearoalabs.co.nz (paper / ink / subject tracks). */
:root {
  --ink: #14251f;
  --ink-soft: #52615b;
  --paper: #f4f0e7;
  --paper-deep: #ebe5d8;
  --card: #fffdf8;
  --line: #14251f2b;
  --green: #146b4d;
  --lime: #c9ef77;
  --good: #1f8a55;
  --good-bg: #e2f5e6;
  --bad: #b8432a;
  --bad-bg: #fde6de;
  --info-bg: #eef1ec;
  --track: #146b4d;
  --track-bg: #e4eadf;
  --shadow: 0 1px 0 #14251f14, 0 8px 24px -12px #14251f40;
  --radius: 18px;
  --font: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: "Cascadia Mono", Consolas, ui-monospace, monospace;
  color-scheme: light;
}

.biology, body[data-subject="biology"] { --track: #22875b; --track-bg: #d9f0c0; }
.chemistry, body[data-subject="chemistry"] { --track: #7657d8; --track-bg: #e2dcff; }
.physics, body[data-subject="physics"] { --track: #d5653f; --track-bg: #ffdac8; }
.computing, body[data-subject="computing"] { --track: #2462a7; --track-bg: #d8eaff; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #eef3ec; --ink-soft: #a9b7b0; --paper: #0f1a16; --paper-deep: #17241f; --card: #1a2a24;
    --line: #eef3ec26; --good-bg: #173a29; --bad-bg: #42221a; --info-bg: #1f2f29; --good: #6fd39b; --bad: #ff8f73;
    --track-bg: #24352e; --shadow: 0 1px 0 #0006, 0 10px 28px -14px #000c; color-scheme: dark;
  }
  :root:not([data-theme="light"]) .biology, :root:not([data-theme="light"]) body[data-subject="biology"] { --track: #49c487; --track-bg: #1f3a2b; }
  :root:not([data-theme="light"]) .chemistry, :root:not([data-theme="light"]) body[data-subject="chemistry"] { --track: #a993ff; --track-bg: #2c2550; }
  :root:not([data-theme="light"]) .physics, :root:not([data-theme="light"]) body[data-subject="physics"] { --track: #ff8a62; --track-bg: #48291d; }
  :root:not([data-theme="light"]) .computing, :root:not([data-theme="light"]) body[data-subject="computing"] { --track: #6aa8f0; --track-bg: #1b2f4a; }
}
:root[data-theme="dark"] {
  --ink: #eef3ec; --ink-soft: #a9b7b0; --paper: #0f1a16; --paper-deep: #17241f; --card: #1a2a24;
  --line: #eef3ec26; --good-bg: #173a29; --bad-bg: #42221a; --info-bg: #1f2f29; --good: #6fd39b; --bad: #ff8f73;
  --track-bg: #24352e; --shadow: 0 1px 0 #0006, 0 10px 28px -14px #000c; color-scheme: dark;
}
:root[data-theme="dark"] .biology, :root[data-theme="dark"] body[data-subject="biology"] { --track: #49c487; --track-bg: #1f3a2b; }
:root[data-theme="dark"] .chemistry, :root[data-theme="dark"] body[data-subject="chemistry"] { --track: #a993ff; --track-bg: #2c2550; }
:root[data-theme="dark"] .physics, :root[data-theme="dark"] body[data-subject="physics"] { --track: #ff8a62; --track-bg: #48291d; }
:root[data-theme="dark"] .computing, :root[data-theme="dark"] body[data-subject="computing"] { --track: #6aa8f0; --track-bg: #1b2f4a; }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh; background: var(--paper); color: var(--ink);
  font: 16px/1.5 var(--font); -webkit-font-smoothing: antialiased;
}
[data-motion="off"] *, [data-motion="off"] *::before, [data-motion="off"] *::after { animation: none !important; transition: none !important; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 .4em; }
h1 { font-size: clamp(1.9rem, 4.5vw, 3rem); }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 .8em; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--track); outline-offset: 2px; border-radius: 6px; }
[hidden] { display: none !important; }
.muted { color: var(--ink-soft); }
.small { font-size: .85rem; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--card); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.skip-link:focus { left: 8px; }
.noscript { padding: 24px; }

/* App bar ------------------------------------------------------------------ */
.app-bar {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 10px max(16px, env(safe-area-inset-left)); background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 750; font-size: 1.1rem; }
.app-nav { display: flex; align-items: center; gap: 8px; }
.pill { display: inline-flex; gap: 4px; align-items: center; padding: 5px 11px; border-radius: 99px; background: var(--card); border: 1px solid var(--line); font-size: .9rem; white-space: nowrap; }
.icon-btn { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 12px; text-decoration: none; background: var(--card); border: 1px solid var(--line); }
.icon-btn:hover { border-color: var(--ink-soft); }

main { max-width: 1160px; margin: 0 auto; padding: 22px 16px 60px; outline: none; }
.back { display: inline-block; margin-bottom: 14px; text-decoration: none; color: var(--ink-soft); font-weight: 600; }
.back:hover { color: var(--ink); }

/* Buttons ------------------------------------------------------------------ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 42px; padding: 8px 16px;
  border-radius: 12px; border: 1.5px solid var(--ink); background: var(--card); color: var(--ink);
  font-weight: 650; text-decoration: none; cursor: pointer; transition: transform .12s, background .12s;
}
.btn:hover:not(:disabled) { transform: translateY(-1px); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--ink); color: var(--paper); }
.btn.track { background: var(--track); border-color: var(--track); color: #fff; }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.danger { border-color: var(--bad); color: var(--bad); }
.btn.small { min-height: 34px; padding: 4px 12px; font-size: .9rem; }
.btn.big { min-height: 52px; padding: 12px 22px; font-size: 1.05rem; }

/* Home --------------------------------------------------------------------- */
.hero { display: grid; grid-template-columns: 1.6fr 1fr; gap: 28px; align-items: center; padding: 18px 0 30px; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .78rem; font-weight: 700; color: var(--ink-soft); margin-bottom: .6em; }
.hl { background: linear-gradient(transparent 60%, var(--lime) 60%); padding: 0 .1em; }
:root[data-theme="dark"] .hl { background: linear-gradient(transparent 62%, #3d5a1d 62%); }
.lede { font-size: 1.12rem; color: var(--ink-soft); max-width: 60ch; }
.hero-actions { margin-top: 18px; }
.hero-card { display: flex; gap: 18px; align-items: center; padding: 22px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.hero-card strong { display: block; font-size: 1.15rem; }
.hero-card span { color: var(--ink-soft); }
.ring { position: relative; width: 80px; height: 80px; flex: none; }
.ring svg { transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 9; stroke-linecap: round; }
.ring-bg { stroke: var(--paper-deep); }
.ring-fg { stroke: var(--green); transition: stroke-dasharray .6s ease; }
.ring > span { position: absolute; inset: 0; display: grid; place-items: center; font-weight: 750; color: var(--ink) !important; }
.section-title { margin-top: 10px; }

.subject-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 34px; }
.subject-card {
  display: flex; flex-direction: column; gap: 4px; padding: 18px; border-radius: var(--radius); text-decoration: none;
  background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow); border-top: 6px solid var(--track);
  transition: transform .15s, box-shadow .15s;
}
.subject-card:hover { transform: translateY(-3px); box-shadow: 0 14px 30px -14px #14251f66; }
.subject-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.subject-icon { display: grid; place-items: center; width: 46px; height: 46px; border-radius: 14px; background: var(--track-bg); font-size: 1.5rem; }
.subject-icon.big { width: 76px; height: 76px; font-size: 2.4rem; border-radius: 22px; flex: none; }
.tag { font-size: .72rem; font-weight: 800; letter-spacing: .12em; color: var(--track); }
.subject-card h3 { margin: 4px 0 0; }
.subject-q { font-weight: 600; margin: 0; }
.subject-card .muted { font-size: .92rem; flex: 1; }
.mini-meter, .lesson-meter { height: 8px; border-radius: 99px; background: var(--track-bg); overflow: hidden; }
.mini-meter span, .lesson-meter span { display: block; height: 100%; background: var(--track); border-radius: 99px; transition: width .4s ease; }
.subject-foot { display: flex; justify-content: space-between; font-size: .88rem; color: var(--ink-soft); margin-top: 8px; }
.subject-foot b { color: var(--track); }

.method-steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.method-steps li { display: flex; flex-direction: column; gap: 2px; padding: 16px; border-radius: 14px; background: var(--paper-deep); }
.method-steps b { font-family: var(--mono); color: var(--green); font-size: .85rem; }
.method-steps span { color: var(--ink-soft); font-size: .92rem; }
.app-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: .85rem; }

/* Subject page ------------------------------------------------------------- */
.subject-hero { display: flex; gap: 20px; align-items: center; padding: 22px; border-radius: var(--radius); background: var(--track-bg); margin-bottom: 20px; }
.subject-hero h1 { margin-bottom: .1em; }
.subject-hero .lede { margin: 0; color: var(--ink); }
.subject-hero .eyebrow { color: var(--track); margin: 0; }
.lesson-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.lesson-row {
  display: grid; grid-template-columns: auto 1fr auto; gap: 18px; align-items: center; padding: 16px 18px;
  border-radius: var(--radius); background: var(--card); border: 1px solid var(--line); text-decoration: none; box-shadow: var(--shadow);
  transition: transform .15s;
}
.lesson-row:hover { transform: translateX(3px); border-color: var(--track); }
.lesson-num { font-family: var(--mono); font-size: 1.4rem; font-weight: 700; color: var(--track); }
.lesson-info { display: flex; flex-direction: column; }
.lesson-info strong { font-size: 1.1rem; }
.lesson-info > span:last-child { color: var(--ink-soft); }
.lesson-state { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }
.chip { display: inline-block; padding: 2px 10px; border-radius: 99px; background: var(--track-bg); color: var(--track); font-weight: 700; font-size: .78rem; }
.stars { display: inline-flex; gap: 2px; font-size: 1.15rem; letter-spacing: 0; }
.stars span { color: var(--paper-deep); -webkit-text-stroke: 1px var(--line); }
.stars span.on { color: #f2b51e; -webkit-text-stroke: 0; }

/* Lesson player ------------------------------------------------------------ */
.interactive-lesson { background: var(--card); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); overflow: hidden; }
.lesson-topbar { display: flex; justify-content: space-between; gap: 12px; align-items: center; padding: 14px 20px; font-size: .9rem; color: var(--ink-soft); }
.lesson-topbar strong { color: var(--ink); font-size: 1.05rem; text-align: center; }
.lesson-meter { margin: 0 20px; height: 6px; }
.lesson-workspace { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 20px; padding: 20px; }
.lesson-canvas { min-width: 0; border-radius: 16px; background: var(--track-bg); padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.lesson-canvas > p, .model-note { font-size: .8rem; color: var(--ink-soft); margin: 0; }
.lesson-instruction { min-width: 0; display: flex; flex-direction: column; gap: 12px; }
.kicker { text-transform: uppercase; font-size: .75rem; letter-spacing: .12em; font-weight: 800; color: var(--track); margin: 0; }
.prompt { font-size: 1.2rem; font-weight: 700; margin: 0; }
.rule { padding: 10px 14px; border-left: 4px solid var(--track); background: var(--paper); border-radius: 0 10px 10px 0; font-size: .95rem; margin: 0; }
.stage-title { display: flex; justify-content: space-between; align-items: center; font-size: .75rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-soft); }
.stage-title b { color: var(--track); }

.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.choice {
  min-height: 48px; padding: 10px 14px; border-radius: 12px; border: 1.5px solid var(--line); background: var(--paper);
  font-weight: 650; text-align: left; cursor: pointer; transition: border-color .12s, background .12s, transform .12s;
}
.choice:hover:not(:disabled) { border-color: var(--track); }
.choice.selected { border-color: var(--track); background: var(--track-bg); }
.choice.correct { border-color: var(--good); background: var(--good-bg); }
.choice.wrong { border-color: var(--bad); background: var(--bad-bg); animation: shake .35s; }
.choice:disabled { cursor: default; }
@keyframes shake { 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }
@keyframes pop { 0% { transform: scale(.6); opacity: 0; } 70% { transform: scale(1.1); } 100% { transform: scale(1); opacity: 1; } }

.feedback { display: flex; flex-direction: column; gap: 2px; padding: 12px 14px; border-radius: 12px; background: var(--info-bg); border: 1px solid var(--line); animation: pop .25s ease-out; }
.feedback.good { background: var(--good-bg); border-color: var(--good); }
.feedback.bad { background: var(--bad-bg); border-color: var(--bad); }
.feedback.good strong { color: var(--good); }
.feedback.bad strong { color: var(--bad); }

.counter { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 8px 10px 8px 14px; border-radius: 12px; background: var(--paper); border: 1px solid var(--line); }
.counter > span { display: flex; gap: 8px; align-items: center; font-weight: 600; }
.counter > div { display: flex; align-items: center; gap: 6px; }
.counter button { width: 38px; height: 38px; border-radius: 10px; border: 1.5px solid var(--ink); background: var(--card); font-size: 1.2rem; font-weight: 700; cursor: pointer; }
.counter button:disabled { opacity: .35; cursor: not-allowed; }
.counter strong { min-width: 2ch; text-align: center; font-family: var(--mono); font-size: 1.2rem; }

.lesson-complete-panel { display: flex; flex-direction: column; gap: 10px; align-items: flex-start; }
.complete-badge { display: grid; place-items: center; width: 56px; height: 56px; border-radius: 50%; background: var(--good); color: #fff; font-size: 1.8rem; font-weight: 800; animation: pop .45s ease-out; }
.facts { margin: 0; padding-left: 1.2em; }
.facts li { margin-bottom: 4px; }
.reward { display: flex; align-items: center; gap: 14px; font-size: 1.6rem; }
.reward .stars { font-size: 2rem; }
.reward .stars span.on { animation: pop .5s ease-out both; }
.reward .stars span.on:nth-child(2) { animation-delay: .15s; }
.reward .stars span.on:nth-child(3) { animation-delay: .3s; }
.xp-gain { font-size: 1rem; font-weight: 800; padding: 4px 12px; border-radius: 99px; background: var(--lime); color: #14251f; }

/* Badges & settings -------------------------------------------------------- */
.badge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; }
.badge-card { display: flex; flex-direction: column; gap: 4px; padding: 18px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--line); }
.badge-card.locked { opacity: .55; }
.badge-card.owned { box-shadow: var(--shadow); border-color: #f2b51e; }
.badge-icon { font-size: 2.2rem; }
.badge-card span:last-child { color: var(--ink-soft); font-size: .9rem; }
.settings { display: grid; gap: 10px; max-width: 680px; }
.setting { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 14px 16px; border-radius: 14px; background: var(--card); border: 1px solid var(--line); }
.setting > span { display: flex; flex-direction: column; }
.setting select { padding: 8px 10px; border-radius: 10px; border: 1.5px solid var(--line); background: var(--paper); }
.switch { appearance: none; width: 48px; height: 28px; border-radius: 99px; background: var(--paper-deep); border: 1.5px solid var(--line); position: relative; cursor: pointer; flex: none; transition: background .15s; }
.switch::after { content: ""; position: absolute; top: 2px; left: 2px; width: 21px; height: 21px; border-radius: 50%; background: var(--card); box-shadow: 0 1px 3px #0005; transition: transform .15s; }
.switch:checked { background: var(--green); border-color: var(--green); }
.switch:checked::after { transform: translateX(20px); }
.about { max-width: 680px; margin-top: 30px; }

.station-shortcuts { margin-bottom: 20px; }
.daily-station { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px; margin-bottom: 28px; border: 1px solid var(--line); border-left: 5px solid var(--track); border-radius: var(--radius); background: var(--card); }
.daily-station p { margin: 0; }
.station-filters { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }
.station-filters input { flex: 1 1 240px; min-width: 0; }
.station-filters input, .station-filters select, .lab-note textarea { padding: 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
.station-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.station-card { padding: 20px; border-radius: var(--radius); border: 1px solid var(--line); border-top: 4px solid var(--track); background: var(--card); text-decoration: none; }
.station-card:hover { border-color: var(--track); }
.station-card h2 { margin-top: 10px; }
.lab-note, .notebook-entry { margin-top: 20px; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.lab-note summary { font-weight: 700; cursor: pointer; }
.lab-note p { margin-top: 12px; }
.lab-note textarea { display: block; width: 100%; resize: vertical; }
.notebook-entry p { white-space: pre-wrap; overflow-wrap: anywhere; }
@media (max-width: 640px) {
  .daily-station { align-items: flex-start; flex-direction: column; }
  .station-filters select { width: 100%; }
  .setting { flex-wrap: wrap; }
}

/* Toasts & confetti -------------------------------------------------------- */
#toast-host { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; gap: 8px; z-index: 20; pointer-events: none; }
.toast { display: flex; gap: 10px; align-items: center; padding: 12px 18px; border-radius: 14px; background: var(--ink); color: var(--paper); font-weight: 650; box-shadow: 0 12px 30px -10px #000a; animation: pop .3s ease-out; transition: opacity .4s, transform .4s; }
.toast.leaving { opacity: 0; transform: translateY(10px); }
#confetti { position: fixed; inset: 0; width: 100vw; height: 100vh; pointer-events: none; z-index: 30; display: none; }

/* Responsive --------------------------------------------------------------- */
@media (max-width: 960px) {
  .subject-grid { grid-template-columns: repeat(2, 1fr); }
  .method-steps { grid-template-columns: repeat(2, 1fr); }
  .lesson-workspace { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .hero { grid-template-columns: 1fr; }
  .subject-grid, .method-steps { grid-template-columns: 1fr; }
  .lesson-row { grid-template-columns: auto 1fr; }
  .lesson-state { grid-column: 1 / -1; flex-direction: row; justify-content: space-between; align-items: center; }
  .lesson-topbar { flex-wrap: wrap; }
  .lesson-topbar strong { order: -1; width: 100%; text-align: left; }
  .lesson-workspace { padding: 12px; }
  .choice-grid { grid-template-columns: 1fr; }
  #xp-pill { display: none; }
}

.brand-group { display:flex; flex-direction:column; gap:3px; }
.site-return { color:var(--ink-soft); font-size:.8rem; text-decoration:underline; text-underline-offset:3px; }
.site-return:focus-visible { outline:3px solid var(--track, var(--ink)); outline-offset:3px; }