:root {
  --bg: #f5f6fb;
  --surface: #ffffff;
  --surface-2: #eef0f8;
  --text: #1c1f33;
  --muted: #5d6280;
  --border: #dfe2ef;
  --primary: #4f46e5;
  --primary-ink: #ffffff;
  --primary-soft: #e6e5fd;
  --ok: #15803d;
  --ok-soft: #dcfce7;
  --ko: #c2410c;
  --ko-soft: #ffedd5;
  --gold: #d97706;
  --shadow: 0 2px 10px rgba(28, 31, 51, .08);
  --radius: 16px;
  --fs: 17px;
  --ls: normal;
  /* colors de les illes */
  --c-numeric: #4f46e5;
  --c-mesura: #0891b2;
  --c-espacial: #16a34a;
  --c-algebraic: #9333ea;
  --c-estocastic: #db2777;
  --c-estrategies: #ea580c;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12131c; --surface: #1c1e2b; --surface-2: #262938; --text: #eceef8; --muted: #a5a9c4;
    --border: #33374a; --primary: #8b85ff; --primary-ink: #12131c; --primary-soft: #2c2a55;
    --ok: #4ade80; --ok-soft: #173a25; --ko: #fb923c; --ko-soft: #42261a; --gold: #fbbf24;
    --shadow: 0 2px 10px rgba(0, 0, 0, .4);
    --c-numeric: #8b85ff; --c-mesura: #22d3ee; --c-espacial: #4ade80; --c-algebraic: #c084fc;
    --c-estocastic: #f472b6; --c-estrategies: #fb923c;
  }
}
:root[data-theme="dark"] {
  --bg: #12131c; --surface: #1c1e2b; --surface-2: #262938; --text: #eceef8; --muted: #a5a9c4;
  --border: #33374a; --primary: #8b85ff; --primary-ink: #12131c; --primary-soft: #2c2a55;
  --ok: #4ade80; --ok-soft: #173a25; --ko: #fb923c; --ko-soft: #42261a; --gold: #fbbf24;
  --shadow: 0 2px 10px rgba(0, 0, 0, .4);
  --c-numeric: #8b85ff; --c-mesura: #22d3ee; --c-espacial: #4ade80; --c-algebraic: #c084fc;
  --c-estocastic: #f472b6; --c-estrategies: #fb923c;
}
body.lletra-gran { --fs: 19px; }
body.lletra-molt-gran { --fs: 22px; }
body.espaiada { --ls: .04em; word-spacing: .12em; }

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--text);
  font: var(--fs)/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  letter-spacing: var(--ls);
  -webkit-tap-highlight-color: transparent;
}
#app { max-width: 760px; margin: 0 auto; padding: 12px 16px calc(32px + env(safe-area-inset-bottom)); min-height: 100vh; }
h1, h2, h3 { line-height: 1.25; margin: .2em 0 .5em; }
h1 { font-size: 1.6em; } h2 { font-size: 1.3em; } h3 { font-size: 1.08em; }
p { margin: .4em 0 .8em; }
.muted { color: var(--muted); }
.small { font-size: .85em; }
.center { text-align: center; }
.row { display: flex; gap: 10px; align-items: center; }
.row.wrap { flex-wrap: wrap; }
.spacer { flex: 1; }
.stack > * + * { margin-top: 12px; }

/* barra superior */
.topbar { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.topbar h1, .topbar h2 { margin: 0; flex: 1; font-size: 1.2em; }
.icon-btn {
  border: 0; background: var(--surface); color: var(--text); box-shadow: var(--shadow);
  width: 44px; height: 44px; border-radius: 12px; font-size: 1.2em; cursor: pointer; flex: none;
}

/* targetes i botons */
.card { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 10px 18px; border-radius: 14px; border: 2px solid transparent;
  background: var(--primary); color: var(--primary-ink); font: inherit; font-weight: 650; cursor: pointer;
  text-decoration: none;
}
.btn.sec { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn.soft { background: var(--primary-soft); color: var(--text); }
.btn.perill { background: var(--ko); color: #fff; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .45; cursor: default; }
.btn:focus-visible, .icon-btn:focus-visible, .opcio:focus-visible, .tecla:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }

/* perfils */
.perfils { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
.perfil {
  background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); border: 0; color: var(--text);
  padding: 18px 10px; text-align: center; cursor: pointer; font: inherit;
}
.perfil .av { font-size: 2.6em; line-height: 1.2; }
.perfil .nom { font-weight: 650; margin-top: 4px; word-break: break-word; }
.perfil.nou { border: 2px dashed var(--border); background: transparent; box-shadow: none; color: var(--muted); }
.logo { font-size: 2em; font-weight: 800; margin: 12px 0 2px; }
.logo span { color: var(--primary); }

/* capçalera de l'alumne */
.estat { display: flex; align-items: center; gap: 12px; }
.estat .av { font-size: 2.2em; }
.xpbar { height: 10px; background: var(--surface-2); border-radius: 99px; overflow: hidden; }
.xpbar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--primary), var(--c-algebraic)); border-radius: 99px; }
.xifra { display: inline-flex; align-items: center; gap: 4px; font-weight: 700; background: var(--surface-2); padding: 3px 10px; border-radius: 99px; font-size: .9em; }

.accions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 14px 0; }
.accio {
  background: var(--surface); border: 0; border-radius: var(--radius); box-shadow: var(--shadow); color: var(--text);
  padding: 12px 6px; font: inherit; font-size: .9em; font-weight: 650; cursor: pointer; position: relative;
}
.accio .e { display: block; font-size: 1.7em; }
.bombolla {
  position: absolute; top: 6px; right: 8px; background: var(--ko); color: #fff; font-size: .75em;
  min-width: 22px; height: 22px; border-radius: 99px; display: grid; place-items: center; padding: 0 6px;
}

/* illes */
.illa { border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); overflow: hidden; margin-bottom: 14px; }
.illa > header { display: flex; align-items: center; gap: 10px; padding: 12px 16px; color: #fff; background: var(--ci); }
.illa > header h2 { margin: 0; font-size: 1.1em; flex: 1; }
.illa > header .e { font-size: 1.5em; }
.hab { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-top: 1px solid var(--border); }
.hab:first-of-type { border-top: 0; }
.hab .info { flex: 1; min-width: 0; }
.hab .nom { font-weight: 600; }
.estrelles { color: var(--gold); letter-spacing: 1px; white-space: nowrap; }
.estrelles .buida { color: var(--border); }
.minibar { height: 6px; background: var(--surface-2); border-radius: 99px; overflow: hidden; margin-top: 6px; }
.minibar > i { display: block; height: 100%; background: var(--ci, var(--primary)); }
.hab .btns { display: flex; gap: 6px; }
.hab .btn { min-height: 40px; padding: 6px 12px; font-size: .9em; }
.etiqueta { font-size: .75em; font-weight: 700; padding: 2px 8px; border-radius: 99px; background: var(--ko-soft); color: var(--ko); }

/* sessió */
.progres { height: 12px; background: var(--surface-2); border-radius: 99px; overflow: hidden; flex: 1; }
.progres > i { display: block; height: 100%; background: var(--primary); transition: width .3s; }
.enunciat { font-size: 1.2em; font-weight: 600; margin: 18px 0; }
.opcions { display: grid; gap: 10px; }
.opcio {
  text-align: left; padding: 14px 16px; min-height: 56px; border-radius: 14px; border: 2px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-size: 1.05em; cursor: pointer;
}
.opcio.ok { border-color: var(--ok); background: var(--ok-soft); }
.opcio.ko { border-color: var(--ko); background: var(--ko-soft); }
.opcio:disabled { cursor: default; }
.resposta {
  font-size: 1.6em; font-weight: 700; text-align: center; min-height: 64px; padding: 10px; border-radius: 14px;
  background: var(--surface); border: 2px solid var(--border); margin-bottom: 10px; display: grid; place-items: center;
  font-variant-numeric: tabular-nums;
}
.resposta.buida { color: var(--muted); font-weight: 400; font-size: 1em; }
.resposta.ok { border-color: var(--ok); background: var(--ok-soft); }
.resposta.ko { border-color: var(--ko); background: var(--ko-soft); }
.teclat { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.tecla {
  min-height: 56px; border-radius: 12px; border: 0; background: var(--surface); box-shadow: var(--shadow);
  font: inherit; font-size: 1.3em; font-weight: 650; color: var(--text); cursor: pointer;
}
.tecla.fn { background: var(--surface-2); }
.tecla.go { background: var(--primary); color: var(--primary-ink); }
.retro { border-radius: var(--radius); padding: 14px 16px; margin-top: 14px; }
.retro.ok { background: var(--ok-soft); }
.retro.ko { background: var(--ko-soft); }
.retro h3 { margin: 0 0 4px; }
.pista { background: var(--primary-soft); border-radius: 12px; padding: 10px 14px; margin: 10px 0; }

/* lliçons */
.passos { padding-left: 0; list-style: none; margin: 0; }
.passos li { background: var(--surface-2); border-radius: 12px; padding: 10px 14px; margin-bottom: 8px; }
.passos li.nou { animation: apareix .35s ease; }
@keyframes apareix { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.idea { font-size: 1.2em; font-weight: 600; }
.puntets { display: flex; gap: 6px; justify-content: center; margin: 12px 0; }
.puntets i { width: 9px; height: 9px; border-radius: 99px; background: var(--border); }
.puntets i.on { background: var(--primary); }
.compte { border-left: 5px solid var(--ko); }

/* resum i progrés */
.gran { font-size: 2.6em; font-weight: 800; line-height: 1.1; }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; }
.kpi { background: var(--surface); border-radius: 14px; box-shadow: var(--shadow); padding: 12px; }
.kpi b { display: block; font-size: 1.5em; }
.kpi span { color: var(--muted); font-size: .85em; }
.insignies { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 10px; }
.insignia { text-align: center; background: var(--surface); border-radius: 14px; padding: 10px 6px; box-shadow: var(--shadow); font-size: .8em; }
.insignia .e { font-size: 2em; display: block; }
.insignia.no { opacity: .35; filter: grayscale(1); }
.grafic svg { width: 100%; height: auto; display: block; }
.grafic text { fill: var(--muted); font-size: 11px; font-family: inherit; }

/* docent */
.taula-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: .85em; background: var(--surface); }
th, td { padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
th { position: sticky; top: 0; background: var(--surface-2); }
td.cel { text-align: center; font-weight: 650; min-width: 38px; color: #1c1f33; }
tr.clic { cursor: pointer; }
.llegenda { display: flex; gap: 10px; flex-wrap: wrap; font-size: .8em; }
.llegenda i { display: inline-block; width: 14px; height: 14px; border-radius: 4px; vertical-align: -2px; margin-right: 4px; }

/* formularis */
label.camp { display: block; margin-bottom: 12px; font-weight: 600; }
input[type=text], input[type=password], input[type=tel], select {
  display: block; width: 100%; margin-top: 6px; padding: 12px; font: inherit; border-radius: 12px;
  border: 2px solid var(--border); background: var(--surface); color: var(--text);
}
.avatars { display: grid; grid-template-columns: repeat(auto-fill, minmax(56px, 1fr)); gap: 8px; margin-top: 6px; }
.avatars button {
  font-size: 1.8em; height: 56px; border-radius: 12px; border: 2px solid var(--border); background: var(--surface); cursor: pointer;
}
.avatars button.sel { border-color: var(--primary); background: var(--primary-soft); }
.avatars button:disabled { opacity: .3; cursor: default; }
.opcions-seg { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.opcions-seg button { flex: 1; min-height: 44px; border-radius: 10px; border: 2px solid var(--border); background: var(--surface); color: var(--text); font: inherit; cursor: pointer; }
.opcions-seg button.sel { border-color: var(--primary); background: var(--primary-soft); font-weight: 700; }

/* toast i modal */
#toast {
  position: fixed; left: 50%; bottom: calc(20px + env(safe-area-inset-bottom)); transform: translateX(-50%) translateY(120px);
  background: var(--text); color: var(--bg); padding: 12px 18px; border-radius: 14px; max-width: calc(100% - 32px);
  transition: transform .3s; z-index: 30; font-weight: 600; text-align: center;
}
#toast.on { transform: translateX(-50%) translateY(0); }
#modal { position: fixed; inset: 0; background: rgba(10, 12, 25, .55); display: grid; place-items: center; padding: 16px; z-index: 20; }
#modal[hidden] { display: none; }
#modal .card { width: 100%; max-width: 420px; }

.confeti { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 25; }
.confeti i { position: absolute; top: -12px; width: 9px; height: 14px; border-radius: 2px; animation: cau 1.6s linear forwards; }
@keyframes cau { to { transform: translateY(110vh) rotate(540deg); opacity: .8; } }
@media (prefers-reduced-motion: reduce) { .confeti { display: none; } .passos li.nou { animation: none; } }