/* Laboratori de formulació inorgànica
   La interfície es dissenya per a 1440 × 800 px i s'escala amb --ui-zoom (vegeu fitScale a app.js).
   La base visual és la mateixa que la del laboratori d'igualació d'equacions. */

:root {
  color-scheme: light;
  --ui-zoom: 1;
  --bg-1: #cde4ff;
  --bg-2: #f5f9ff;
  --panel: rgba(255, 255, 255, 0.94);
  --panel-solid: #ffffff;
  --line: rgba(148, 163, 184, 0.38);
  --line-strong: rgba(100, 116, 139, 0.5);
  --text: #0f172a;
  --muted: #475569;
  --blue: #2563eb;
  --blue-soft: rgba(37, 99, 235, 0.1);
  --green: #15803d;
  --green-soft: #dcfce7;
  --red: #b91c1c;
  --red-soft: #fee2e2;
  --amber: #b45309;
  --amber-soft: #fef3c7;
  --l1: #15803d;
  --l2: #b45309;
  --l3: #b91c1c;
  --l4: #6d28d9;
  --shadow: 0 14px 34px rgba(15, 35, 95, 0.13);
  --radius: 18px;
  --formula-h: 46px;
  --stepper-h: 40px;
  --footer-h: 50px;
  --term-gap: 30px;
  --panel-w: 300px;
  font-family: "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  zoom: var(--ui-zoom);
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  background: linear-gradient(135deg, var(--bg-1), var(--bg-2)) fixed;
  color: var(--text);
  font-size: 16px;
  line-height: 1.35;
}

button,
input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.55);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

svg {
  display: block;
}

/* ---------- Estructura general (una sola pantalla) ---------- */

.app-shell {
  height: calc(100dvh / var(--ui-zoom));
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 12px;
  padding: 12px 18px calc(var(--footer-h) + 8px);
}

.panel,
.topbar,
.lab-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- Barra superior ---------- */

.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 14px;
  min-height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  box-shadow: 0 6px 14px rgba(37, 99, 235, 0.25);
}

.brand-title {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  white-space: nowrap;
  background: linear-gradient(135deg, #0f172a, #1e40af);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.mode-tabs {
  display: inline-flex;
  padding: 3px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.18);
  border: 1px solid var(--line);
}

.mode-tab {
  border: 0;
  background: transparent;
  padding: 6px 16px;
  border-radius: 999px;
  font-weight: 700;
  color: var(--muted);
}

.mode-tab.active {
  background: #fff;
  color: var(--blue);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.12);
}

.filters {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: 0;
}

.level-chips {
  display: flex;
  gap: 6px;
}

.level-chip {
  --c: var(--blue);
  border: 2px solid var(--c);
  background: #fff;
  color: var(--c);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.88rem;
  font-weight: 700;
  transition: background 0.15s, color 0.15s;
}

.level-chip[aria-pressed="false"] {
  border-color: var(--line-strong);
  color: #64748b;
  background: transparent;
}

.level-chip[aria-pressed="true"] {
  background: var(--c);
  color: #fff;
}

.level-chip.l1,
.tag.l1 { --c: var(--l1); }
.level-chip.l2,
.tag.l2 { --c: var(--l2); }
.level-chip.l3,
.tag.l3 { --c: var(--l3); }
.level-chip.l4,
.tag.l4 { --c: var(--l4); }

.dropdown {
  position: relative;
}

.dropdown-trigger {
  border: 1px solid var(--line-strong);
  background: #fff;
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  min-width: 150px;
  display: inline-flex;
  justify-content: space-between;
  gap: 8px;
}

.dropdown-trigger::after {
  content: "▾";
  color: var(--muted);
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 50;
  min-width: 220px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 8px;
}

.dropdown.open .dropdown-menu {
  display: block;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 6px;
  border-radius: 8px;
  font-size: 0.92rem;
  cursor: pointer;
}

.check-row:hover {
  background: var(--blue-soft);
}

.check-row input {
  width: 16px;
  height: 16px;
  accent-color: var(--blue);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.primary-btn {
  border: 0;
  border-radius: 12px;
  padding: 9px 16px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #2563eb, #60a5fa);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.28);
  transition: transform 0.15s, box-shadow 0.15s;
  white-space: nowrap;
}

.primary-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.35);
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  display: grid;
  place-items: center;
  color: var(--muted);
}

.icon-btn svg,
.action-btn svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-btn:hover {
  color: var(--blue);
  border-color: rgba(37, 99, 235, 0.4);
}

.icon-btn[aria-pressed="true"] {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}

/* ---------- Zona de treball ---------- */

.lab {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--panel-w);
  gap: 12px;
  min-height: 0;
}

.lab-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 16px 12px;
  min-height: 0;
}

.lab-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 36px;
}

.tag {
  --c: var(--blue);
  display: inline-flex;
  align-items: center;
  padding: 3px 11px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--c);
  background: color-mix(in srgb, var(--c) 12%, white);
  border: 1px solid color-mix(in srgb, var(--c) 35%, white);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 14px 4px 5px;
  border-radius: 999px;
  font-weight: 700;
  background: #f1f5f9;
  color: var(--muted);
  border: 1px solid var(--line);
  white-space: nowrap;
}

.status-icon {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #cbd5e1;
  color: #fff;
  font-weight: 800;
}

.status.ok {
  background: var(--green-soft);
  color: var(--green);
  border-color: #86efac;
}

.status.ok .status-icon {
  background: #16a34a;
}

.status.bad {
  background: var(--red-soft);
  color: var(--red);
  border-color: #fca5a5;
}

.status.bad .status-icon {
  background: #dc2626;
}

.status.simplify {
  background: var(--amber-soft);
  color: var(--amber);
  border-color: #fcd34d;
}

.status.simplify .status-icon {
  background: #d97706;
}

/* Barra del mode Repte */
.challenge-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.cb-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: #1e3a8a;
  font-size: 0.88rem;
  border: 1px solid rgba(37, 99, 235, 0.2);
  white-space: nowrap;
}

.cb-item.timer {
  font-weight: 600;
}

.cb-item.timer[aria-pressed="false"] {
  background: #fff;
  color: var(--muted);
}

.tries-dots {
  display: inline-flex;
  gap: 4px;
}

.tries-dots i {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--blue);
}

.tries-dots i.on {
  background: var(--blue);
}

.star-sm {
  color: #f59e0b;
  font-size: 1.05rem;
}


/* ---------- Accions i missatges ---------- */

.action-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 0;
  border-radius: 12px;
  padding: 9px 18px;
  font-weight: 700;
  transition: transform 0.15s, box-shadow 0.15s;
}

.action-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.12);
}

.action-btn.check {
  background: linear-gradient(135deg, #22c55e, #10b981);
  color: #052e1b;
  font-size: 1.05rem;
  padding: 10px 24px;
}

.action-btn.soft {
  background: rgba(148, 163, 184, 0.22);
}

.action-btn.icon-only {
  padding: 9px 12px;
}

.action-btn.ghost {
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--muted);
}

.action-btn.next {
  background: linear-gradient(135deg, #2563eb, #60a5fa);
  color: #fff;
  margin-left: auto;
}

.action-btn.small {
  padding: 6px 12px;
  font-size: 0.85rem;
}

.feedback {
  flex: 1 1 100%;
  margin: 0;
  min-height: 2.7em;
  padding: 6px 12px;
  border-radius: 12px;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.35;
}

.feedback:empty {
  background: transparent;
}

.feedback.success {
  background: var(--green-soft);
  color: #14532d;
}

.feedback.error {
  background: var(--red-soft);
  color: #7f1d1d;
}

.feedback.hint {
  background: #e0ecff;
  color: #1e3a8a;
}

.feedback strong {
  font-weight: 800;
}

/* ---------- Panell lateral ---------- */

.side-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
}

.panel {
  padding: 12px 14px;
}

.panel-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 800;
}


.score-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 10px;
}

.score {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 4px;
  border-radius: 12px;
  background: var(--blue-soft);
  border: 1px solid rgba(37, 99, 235, 0.18);
}

.score-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #1e40af;
}

.score-value {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.1;
}


/* ---------- Diàlegs ---------- */

.modal {
  border: 0;
  border-radius: 20px;
  padding: 0;
  width: min(820px, 92vw);
  box-shadow: 0 30px 70px rgba(15, 23, 42, 0.35);
  color: var(--text);
}

.modal.small {
  width: min(460px, 92vw);
}

.modal::backdrop {
  background: rgba(15, 23, 42, 0.45);
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 6px;
}

.modal-head h2 {
  margin: 0;
  font-size: 1.25rem;
}

.modal-body {
  padding: 8px 20px 20px;
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.progress-row {
  display: grid;
  grid-template-columns: 210px 1fr 64px;
  align-items: center;
  gap: 10px;
}

.progress-name {
  font-weight: 650;
  font-size: 0.9rem;
}

.progress-track {
  height: 10px;
  border-radius: 999px;
  background: #e2e8f0;
  overflow: hidden;
}

.progress-track span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #22c55e, #16a34a);
}

.progress-num {
  font-weight: 700;
  font-size: 0.9rem;
  text-align: right;
}

.result-body {
  text-align: center;
}

.stars {
  display: flex;
  justify-content: center;
  gap: 10px;
  font-size: 3.2rem;
  line-height: 1;
  color: #e2e8f0;
}

.stars .on {
  color: #f59e0b;
  text-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

.result-points {
  font-size: 1.4rem;
  font-weight: 800;
  margin: 10px 0 4px;
}

.result-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}

/* ---------- Diàleg d'informació (taula d'ions i progrés) ---------- */

.info-modal {
  /* vw i vh es multipliquen pel zoom de la interfície: cal dividir-los. */
  width: min(1000px, calc(94vw / var(--ui-zoom)));
  max-height: calc(88vh / var(--ui-zoom));
  overflow: hidden;
  background: #f8fbff;
}

.info-modal[open] {
  display: flex;
  flex-direction: column;
}

.info-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 22px 14px;
  background: linear-gradient(120deg, #1d4ed8, #4f46e5 60%, #7c3aed);
  color: #fff;
}

.info-title {
  display: flex;
  align-items: center;
  gap: 14px;
}

.info-title h2 {
  margin: 0;
  font-size: 1.35rem;
}

.info-title p {
  margin: 2px 0 0;
  font-size: 0.92rem;
  opacity: 0.9;
}

.info-badge {
  width: 46px;
  height: 46px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.info-badge svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: #fff;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.info-head .icon-btn {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

.info-head .icon-btn svg {
  stroke: #fff;
}

.info-tabs {
  display: flex;
  gap: 6px;
  padding: 10px 22px 0;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.info-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px 11px;
  border: 0;
  border-bottom: 3px solid transparent;
  background: none;
  font: inherit;
  font-weight: 650;
  font-size: 0.95rem;
  color: var(--muted);
  cursor: pointer;
}

.info-tab svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.info-tab:hover {
  color: var(--text);
}

.info-tab[aria-selected="true"] {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

.info-tab:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: -3px;
  border-radius: 8px 8px 0 0;
}

.info-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 18px 22px 22px;
}

.pane-title {
  margin: 0 0 10px;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #475569;
}

.info-pane > .pane-title:not(:first-child) {
  margin-top: 20px;
}

.pane-intro {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.95rem;
}

/* El meu progrés */

.stat-cards {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.stat-card {
  --c: var(--blue);
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 14px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 4px solid var(--c);
}

.stat-card.green { --c: var(--green); }
.stat-card.slate { --c: #64748b; }
.stat-card.amber { --c: #d97706; }
.stat-card.violet { --c: var(--l4); }

.stat-value {
  font-size: 1.7rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--c);
}

.stat-value small {
  font-size: 0.95rem;
  color: var(--muted);
  font-weight: 700;
}

.stat-label {
  font-size: 0.82rem;
  font-weight: 650;
  color: var(--muted);
}

.level-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.level-card {
  --c: var(--l1);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--line);
}

.level-card.l2 { --c: var(--l2); }
.level-card.l3 { --c: var(--l3); }
.level-card.l4 { --c: var(--l4); }

.level-card.complete {
  background: #f0fdf4;
  border-color: rgba(21, 128, 61, 0.35);
}

.ring {
  --p: 0;
  width: 58px;
  height: 58px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: conic-gradient(var(--c) calc(var(--p) * 1%), #e2e8f0 0);
}

.ring span {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #fff;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--c);
}

.level-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.level-info strong {
  color: var(--c);
}

.level-num {
  font-weight: 700;
  font-size: 0.92rem;
}

.level-info small {
  font-size: 0.78rem;
  color: var(--muted);
}

.type-progress {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--line);
}

.progress-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.progress-foot .muted {
  margin: 0;
  flex: 1 1 320px;
}

/* ---------- Celebració ---------- */

.confetti {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 300;
  overflow: hidden;
}

.confetti i {
  position: absolute;
  top: -12px;
  width: 9px;
  height: 14px;
  border-radius: 2px;
  animation: confetti-fall 1.5s cubic-bezier(0.25, 0.6, 0.4, 1) forwards;
}

@keyframes confetti-fall {
  to {
    transform: translate(var(--dx), 105vh) rotate(var(--rot));
    opacity: 0.2;
  }
}

/* ---------- Peu de pàgina ---------- */

.felip-app-footer {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 10;
  height: var(--footer-h);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  padding: 6px clamp(16px, 3vw, 38px);
  border-top: 1px solid #dce3f3;
  background: rgba(244, 246, 252, 0.97);
  backdrop-filter: blur(8px);
  color: #66728e;
  font-size: 0.8rem;
  line-height: 1.22;
}

.felip-license-image-link {
  display: block;
  line-height: 0;
}

.felip-license-image {
  display: block;
  width: 78px;
  height: auto;
}

.felip-footer-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3px;
}

.felip-footer-text p {
  margin: 0;
}

.felip-footer-text a {
  color: #3c5a99;
  font-weight: 600;
  text-decoration: none;
}

.felip-footer-text a:hover,
.felip-footer-text a:focus-visible {
  text-decoration: underline;
}


/* =====================================================================
   Estils propis del laboratori de formulació
   ===================================================================== */

:root {
  --pos: #c2410c;
  --pos-soft: #ffedd5;
  --neg: #0e7490;
  --neg-soft: #cffafe;
}

/* El nivell de batxillerat fa servir el lila. */
.level-chip.l3,
.tag.l3,
.level-card.l3 {
  --c: var(--l4);
}

.badge-l3 {
  margin-left: auto;
  padding: 1px 6px;
  border-radius: 6px;
  background: #ede9fe;
  color: var(--l4);
  font-size: 0.72rem;
  font-weight: 700;
}

.fm {
  font-weight: 650;
  white-space: nowrap;
}

.fm sub,
.fm sup {
  font-size: 0.68em;
  line-height: 0;
}

/* Els signes + i − tipogràfics queden a l'eix matemàtic (mitja alçada de
   la xifra); en una càrrega s'han d'alinear amb la part alta del nombre. */
.sgn {
  position: relative;
  top: -0.2em;
  margin-left: 0.04em;
}

.tag.activity {
  --c: var(--blue);
}

.tag.family {
  --c: #047857;
}

.q-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

/* ---------- Pregunta ---------- */

.question {
  text-align: center;
  padding: 6px 12px 2px;
}

.q-label {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--muted);
}

.q-prompt {
  margin: 4px 0 2px;
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1.2;
  color: #1e3a8a;
  overflow-wrap: anywhere;
}

.q-prompt.is-formula {
  font-size: 3rem;
}

.q-prompt sub,
.q-prompt sup {
  font-size: 0.62em;
}

.q-kind {
  margin: 0;
  min-height: 1.3em;
  font-size: 0.88rem;
  color: var(--muted);
}

.work {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: 4px;
}

/* Respostes escrites */

.answer-box {
  width: min(680px, 100%);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.answer-label {
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--blue);
}

.answer-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--line-strong);
  border-radius: 14px;
  background: #fff;
  font-size: 1.6rem;
  font-weight: 650;
}

.answer-input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.answer-input[readonly] {
  background: #f8fafc;
}

.formula-input {
  letter-spacing: 0.04em;
}

.preview {
  margin: 0;
  font-size: 1.05rem;
  color: var(--muted);
}

.preview .fm {
  font-size: 1.6rem;
  color: var(--text);
}

.input-tip {
  margin: 0;
  font-size: 0.86rem;
  color: var(--muted);
}

.key-row {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.key {
  min-width: 36px;
  padding: 5px 8px;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: #fff;
  font-weight: 700;
}

.key:hover {
  border-color: var(--blue);
  color: var(--blue);
}

/* Tria la resposta */

.options {
  width: min(860px, 100%);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.opt {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 64px;
  padding: 10px 14px;
  border: 2px solid var(--line-strong);
  border-radius: 14px;
  background: #fff;
  text-align: left;
  font-size: 1.12rem;
  font-weight: 650;
  transition: transform 0.12s, border-color 0.12s;
}

.options.formulas .opt {
  font-size: 1.5rem;
}

.opt:hover:not(:disabled) {
  border-color: var(--blue);
  transform: translateY(-1px);
}

.opt-letter {
  width: 30px;
  height: 30px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 0.9rem;
  font-weight: 800;
}

.opt.correct,
.fam-btn.correct {
  border-color: #16a34a;
  background: var(--green-soft);
  opacity: 1;
}

.opt.correct .opt-letter {
  background: #16a34a;
  color: #fff;
}

.opt.wrong,
.fam-btn.wrong {
  border-color: #fca5a5;
  background: var(--red-soft);
  text-decoration: line-through;
}

/* Classifica */

.families {
  width: min(900px, 100%);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}

.fam-btn {
  padding: 14px 10px;
  border: 2px solid var(--line-strong);
  border-radius: 14px;
  background: #fff;
  font-size: 1.05rem;
  font-weight: 700;
}

.fam-btn:hover:not(:disabled) {
  border-color: var(--blue);
  color: var(--blue);
}

/* Construeix amb ions */

.build {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 16px;
  align-items: stretch;
}

.trays {
  display: flex;
  flex-direction: column;
  gap: 12px;
  justify-content: center;
}

.tray {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px dashed var(--line-strong);
  background: #f8fafc;
}

.tray-label {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tray-label.pos {
  color: var(--pos);
}

.tray-label.neg {
  color: var(--neg);
}

.tiles {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ion-tile {
  --c: var(--pos);
  --soft: var(--pos-soft);
  min-width: 82px;
  padding: 8px 12px;
  border: 2px solid color-mix(in srgb, var(--c) 45%, white);
  border-radius: 12px;
  background: var(--soft);
  color: var(--c);
  font-size: 1.35rem;
  transition: transform 0.12s, box-shadow 0.12s;
}

.ion-tile.neg {
  --c: var(--neg);
  --soft: var(--neg-soft);
}

.ion-tile:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(15, 23, 42, 0.12);
}

.ion-tile[aria-pressed="true"] {
  background: var(--c);
  color: #fff;
  border-color: var(--c);
}

.assembly {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 14px;
  border-radius: 16px;
  background: linear-gradient(160deg, rgba(239, 246, 255, 0.95), rgba(236, 253, 245, 0.7));
  border: 1px solid var(--line);
}

.slot {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px;
  border-radius: 12px;
  background: #fff;
  border-left: 5px solid var(--pos);
  font-size: 1.5rem;
}

.slot.neg {
  border-left-color: var(--neg);
}

.slot .fm {
  min-width: 90px;
}

.slot-empty {
  color: #94a3b8;
  font-size: 0.95rem;
  font-weight: 600;
}

.times {
  margin-left: auto;
  color: var(--muted);
  font-size: 1.1rem;
}

.stepper {
  display: flex;
  align-items: center;
  gap: 6px;
}

.step-btn {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--text);
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.step-btn:hover:not(:disabled) {
  border-color: var(--blue);
  background: #eff6ff;
  color: var(--blue);
}

/* Signes + i − dibuixats: queden centrats exactament, sigui quina sigui la font. */
.pm,
.cells i {
  position: relative;
}

.pm {
  width: 12px;
  height: 12px;
}

.pm::before,
.pm.plus::after,
.cells i::before,
.cells i.p::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 2.5px;
  border-radius: 2px;
  background: currentColor;
  transform: translate(-50%, -50%);
}

.pm.plus::after,
.cells i.p::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.step-num {
  min-width: 26px;
  text-align: center;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--blue);
}

.charge-meter {
  padding: 8px 10px;
  border-radius: 12px;
  background: #fff;
  border: 2px solid var(--line);
}

.charge-meter.zero {
  border-color: #86efac;
  background: #f0fdf4;
}

.meter-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 24px;
}

.meter-label {
  width: 34px;
  font-weight: 800;
  font-size: 0.9rem;
}

.cells {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
}

.cells i {
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  border-radius: 5px;
  color: #fff;
}

.cells i::before,
.cells i.p::after {
  width: 10px;
  height: 2px;
}

.cells i.p {
  background: var(--pos);
}

.cells i.m {
  background: var(--neg);
}

.meter-total {
  margin: 6px 0 0;
  font-size: 0.95rem;
}

.build-formula {
  text-align: center;
  font-size: 2.2rem;
  min-height: 1.6em;
  color: #1e3a8a;
}

/* ---------- Panell lateral ---------- */

.activity-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.activity-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.activity-opt {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  text-align: left;
}

.activity-opt:hover {
  background: var(--blue-soft);
}

.activity-opt[aria-checked="true"] {
  background: var(--blue-soft);
  border-color: rgba(37, 99, 235, 0.35);
}

.activity-name {
  font-weight: 700;
  font-size: 0.92rem;
}

.activity-opt[aria-checked="true"] .activity-name {
  color: var(--blue);
}

.activity-desc {
  font-size: 0.76rem;
  color: var(--muted);
}

.help-panel {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.help-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  font-size: 0.9rem;
}

.tips-list,
.hints-list {
  margin: 0;
  padding-left: 18px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.tips-list {
  color: var(--muted);
}

.hints-list {
  margin-top: 10px;
  padding: 8px 8px 8px 26px;
  border-radius: 10px;
  background: #e0ecff;
  color: #1e3a8a;
}

.comp-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.comp-formula {
  font-size: 2rem;
  color: #1e3a8a;
}

.comp-family {
  margin: 0;
  font-weight: 700;
  color: #047857;
}

.name-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.name-list li {
  display: flex;
  flex-direction: column;
  padding: 5px 8px;
  border-radius: 8px;
  background: #f1f5f9;
}

.name-text {
  font-weight: 700;
}

.kind {
  font-size: 0.74rem;
  color: var(--muted);
}

.comp-note,
.comp-context {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.comp-context {
  padding: 6px 8px;
  border-radius: 8px;
  background: var(--amber-soft);
  color: #78350f;
}

.feedback .ctx {
  font-weight: 500;
}

.feedback .pts {
  color: #15803d;
}

/* ---------- Mode Aprèn ---------- */

.learn {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 12px;
  min-height: 0;
}

.learn-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}

.learn-nav .panel-title {
  margin-bottom: 6px;
}

.module-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: transparent;
  text-align: left;
  font-weight: 650;
}

.module-link:hover {
  background: var(--blue-soft);
}

.module-link.active {
  background: var(--blue-soft);
  border-color: rgba(37, 99, 235, 0.35);
  color: var(--blue);
}

.module-num {
  width: 28px;
  height: 28px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: #e2e8f0;
  font-weight: 800;
}

.module-link.active .module-num {
  background: var(--blue);
  color: #fff;
}

.module-title {
  flex: 1;
}

.module-link .tag {
  padding: 1px 7px;
  font-size: 0.7rem;
}

.learn-card {
  min-height: 0;
  overflow-y: auto;
  padding: 18px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.learn-head h2 {
  margin: 2px 0 6px;
  font-size: 1.7rem;
  color: #1e3a8a;
}

.learn-kicker {
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
}

.learn-intro {
  margin: 0 0 14px;
  font-size: 1.05rem;
  color: var(--muted);
}

.learn-boxes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.learn-box {
  padding: 12px 16px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--line);
  font-size: 0.95rem;
}

.learn-box.batx {
  background: #faf5ff;
  border-color: #ddd6fe;
}

.learn-box h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.learn-box p {
  margin: 0 0 8px;
}

.learn-box ul,
.steps-mini {
  margin: 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.learn-box .tip {
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--blue-soft);
  color: #1e3a8a;
}

.learn-box.errors {
  margin-bottom: 16px;
  background: #fff7ed;
  border-color: #fed7aa;
}

.learn-box.errors h3 {
  color: #9a3412;
}

.mini-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.mini-table th,
.mini-table td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.mini-table th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.mini-table th .fm {
  text-transform: none;
}

.prefix-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-bottom: 8px;
}

.prefix-grid > span {
  padding: 6px;
  border-radius: 8px;
  background: #f1f5f9;
  text-align: center;
}

.prefix-grid b {
  color: var(--blue);
}

.ion-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.ion-chips > span {
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--neg-soft);
  color: #164e63;
  font-size: 0.9rem;
}

.ion-chips .fm {
  margin-right: 6px;
}

.rule-pair {
  display: flex;
  gap: 10px;
  margin-bottom: 8px;
}

.rule-pair > span {
  flex: 1;
  padding: 8px;
  border-radius: 10px;
  background: var(--amber-soft);
  text-align: center;
  font-size: 1.1rem;
}

.example-table,
.acid-table {
  display: flex;
  flex-direction: column;
  margin-bottom: 16px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--line);
  overflow: hidden;
}

.example-row {
  display: grid;
  grid-template-columns: 150px 1fr;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
}

.example-row + .example-row,
.acid-row + .acid-row {
  border-top: 1px solid var(--line);
}

.ex-formula {
  font-size: 1.4rem;
  color: #1e3a8a;
}

.ex-names {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.ex-name {
  display: inline-flex;
  flex-direction: column;
  padding: 4px 10px;
  border-radius: 10px;
  background: #f1f5f9;
  font-weight: 650;
}

.ex-name small {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--muted);
}

.acid-row {
  display: grid;
  grid-template-columns: 110px 1fr 100px 1fr;
  gap: 10px;
  align-items: center;
  padding: 6px 14px;
  font-size: 0.95rem;
}

.acid-row .fm {
  font-size: 1.1rem;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.gallery-card {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 4px solid #f59e0b;
}

.g-formula {
  font-size: 1.5rem;
  color: #1e3a8a;
}

.g-name {
  font-weight: 700;
}

.g-ctx {
  font-size: 0.86rem;
  color: var(--muted);
}

.learn-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 8px;
}

/* ---------- Taula d'ions (diàleg) ---------- */

.ion-columns {
  display: grid;
  grid-template-columns: 1fr 1fr 2fr;
  gap: 18px;
  align-items: start;
}

.pane-title.pos {
  color: var(--pos);
}

.pane-title.neg {
  color: var(--neg);
}

.ion-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 14px;
}

.ion-row {
  display: grid;
  grid-template-columns: 74px 1fr;
  align-items: baseline;
  gap: 2px 8px;
  padding: 4px 6px;
  border-bottom: 1px solid var(--line);
}

.ion-row.batx {
  background: #faf5ff;
}

.ion-f {
  font-size: 1.08rem;
}

.ion-n {
  font-weight: 600;
  font-size: 0.92rem;
}

.ion-x {
  grid-column: 2;
  font-size: 0.74rem;
  color: var(--muted);
}

.muted.small {
  font-size: 0.8rem;
}

/* ---------- Mode projector i amplada efectiva reduïda ---------- */

.projector .q-prompt {
  font-size: 2.5rem;
}

.projector .q-prompt.is-formula {
  font-size: 3.4rem;
}

.projector .activity-desc {
  display: none;
}

.projector .assembly {
  gap: 4px;
  padding: 8px 12px;
}

.projector .slot {
  padding: 2px 10px;
}

.projector .tray {
  padding: 8px 10px;
}

.projector .ion-tile {
  min-width: 70px;
  padding: 6px 9px;
}

.projector .step-btn {
  width: 30px;
  height: 30px;
}

.projector .meter-row {
  min-height: 20px;
}

.projector .charge-meter {
  padding: 5px 10px;
}

.projector .meter-total {
  margin-top: 2px;
}

.projector .build-formula {
  font-size: 1.85rem;
  min-height: 1.2em;
  line-height: 1.2;
}

.compact {
  --panel-w: 260px;
}

.compact .brand-title {
  display: none;
}

.compact .lab-head {
  flex-wrap: wrap;
  row-gap: 6px;
}

.compact .challenge-bar {
  margin-left: 0;
}

/* ---------- Mòbil i tauleta vertical (sense escalat, amb desplaçament) ---------- */

@media (max-width: 899px) {
  :root {
    --footer-h: 58px;
  }

  .app-shell {
    height: auto;
    min-height: 100dvh;
    padding: 10px 10px calc(var(--footer-h) + 12px);
    gap: 10px;
  }

  .topbar {
    flex-wrap: wrap;
    gap: 8px 10px;
    padding: 10px;
  }

  .brand {
    flex: 1 1 100%;
  }

  .brand-logo {
    width: 34px;
    height: 34px;
  }

  .brand-title {
    font-size: 1.1rem;
  }

  .filters {
    order: 3;
    flex: 1 1 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .top-actions {
    margin-left: auto;
    flex-wrap: wrap;
  }

  .lab,
  .learn {
    grid-template-columns: 1fr;
  }

  .lab-head {
    flex-wrap: wrap;
  }

  .challenge-bar {
    flex-wrap: wrap;
    margin-left: 0;
  }

  .q-prompt {
    font-size: 1.6rem;
  }

  .q-prompt.is-formula {
    font-size: 2.3rem;
  }

  .work {
    overflow: visible;
  }

  .answer-input {
    font-size: 1.3rem;
  }

  .options,
  .build {
    grid-template-columns: 1fr;
  }

  .families {
    grid-template-columns: 1fr 1fr;
  }

  .ion-tile {
    min-width: 70px;
    font-size: 1.15rem;
  }

  .side-panel {
    display: grid;
    grid-template-columns: 1fr;
  }

  .help-body {
    overflow: visible;
  }

  .action-btn.next {
    margin-left: 0;
  }

  .learn-nav {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .learn-nav .panel-title {
    flex: 1 1 100%;
  }

  .module-link {
    flex: 1 1 45%;
    padding: 6px;
    font-size: 0.85rem;
  }

  .module-link .tag {
    display: none;
  }

  .learn-card {
    overflow: visible;
    padding: 14px;
  }

  .learn-boxes {
    grid-template-columns: 1fr;
  }

  .example-row {
    grid-template-columns: 1fr;
  }

  .acid-row {
    grid-template-columns: 90px 1fr;
  }

  .info-modal {
    width: 96vw;
    max-height: 92dvh;
  }

  .info-title p,
  .info-badge {
    display: none;
  }

  .info-tab {
    flex: 1;
    justify-content: center;
  }

  .ion-columns,
  .ion-grid {
    grid-template-columns: 1fr;
  }

  .stat-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat-cards .stat-card:first-child {
    grid-column: 1 / -1;
  }

  .level-cards {
    grid-template-columns: 1fr;
  }

  .progress-row {
    grid-template-columns: 1fr 64px;
  }

  .progress-row .progress-track {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .felip-license-image {
    width: 64px;
  }

  .felip-app-footer {
    font-size: 0.74rem;
  }
}

.nowrap {
  white-space: nowrap;
}