/* ============================================================
   Multiplicação — 1.º ciclo
   Tema: "Caderno de Matemática" — papel quadriculado, tinta
   azul-escura, lápis de cor e letra manuscrita nos enunciados.
   ============================================================ */

:root {
  /* papel e tinta */
  --paper: #f4efe1;          /* cor do caderno */
  --card: #fffdf6;           /* folha */
  --grid: rgba(43, 74, 110, .10);   /* linhas do quadriculado */
  --ink: #26374d;            /* tinta azul-escura (texto, contornos) */
  --ink-soft: #6a798e;

  /* lápis de cor */
  --primary: #1f7a63;        /* verde-quadro */
  --primary-d: #145244;
  --accent: #e8590c;         /* laranja (sinal ×) */
  --carry: #f08c00;          /* lápis cor de laranja (transporte) */
  --carry-bg: #fff3bf;       /* marcador amarelo */
  --carry-ink: #b45309;
  --green: #2f9e44;
  --green-bg: #e4f6e6;
  --red: #e03131;
  --red-bg: #ffe9e6;

  --cell: clamp(38px, 11vw, 60px);
  --gap: clamp(4px, 1.4vw, 10px);
  --radius: 14px;
  --shadow: 4px 5px 0 rgba(38, 55, 77, .10);
  --border: 2.5px solid var(--ink);

  --font: "Nunito", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --hand: "Patrick Hand", "Comic Sans MS", var(--font);

  font-family: var(--font);
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--paper);
  /* papel quadriculado */
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  -webkit-tap-highlight-color: transparent;
}

#app {
  max-width: 720px;
  margin: 0 auto;
  padding: 14px 14px 28px;
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

/* ---------- Cabeçalho ---------- */
.topbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; margin-right: auto; }
.brand-icon {
  font-size: 1.7rem;
  background: var(--card);
  border: var(--border);
  border-radius: 12px;
  padding: 4px 8px;
  box-shadow: var(--shadow);
  transform: rotate(-4deg);
}
.brand-text h1 {
  margin: 0;
  font-family: var(--hand);
  font-size: 2rem;
  font-weight: 400;
  line-height: 1;
  letter-spacing: .5px;
}
.brand-text p {
  margin: 2px 0 0;
  color: var(--primary);
  font-family: var(--hand);
  font-size: 1rem;
}

.stats { display: flex; gap: 8px; }
.stat {
  background: var(--card);
  border: var(--border);
  border-radius: 12px;
  padding: 5px 9px;
  display: grid;
  grid-template-columns: auto auto;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 0 6px;
  box-shadow: var(--shadow);
  min-width: 62px;
}
.stat-icon { grid-row: 1 / 3; font-size: 1.25rem; }
.stat-val { font-size: 1.15rem; font-weight: 900; line-height: 1; }
.stat-lbl { font-size: .58rem; color: var(--ink-soft); font-weight: 800; text-transform: uppercase; letter-spacing: .4px; }

.top-actions { display: flex; gap: 6px; }
.icon-btn {
  border: var(--border);
  background: var(--card);
  width: 46px; height: 46px;
  border-radius: 12px;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform .08s ease;
}
.icon-btn:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 rgba(38,55,77,.10); }

/* ---------- Painel de Definições ---------- */
.settings-panel {
  background: var(--card);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px 16px;
  margin: 16px 0 4px;
}
.settings-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.settings-head h2 { margin: 0; font-family: var(--hand); font-weight: 400; font-size: 1.35rem; }
.link-btn {
  border: none; background: transparent; color: var(--primary);
  font-weight: 800; font-family: inherit; font-size: .85rem; cursor: pointer; padding: 4px 6px;
}
.settings-body { margin-top: 10px; display: flex; flex-direction: column; gap: 12px; }
.settings-body.collapsed { display: none; }

.set-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.set-label { font-family: var(--hand); font-size: 1.1rem; color: var(--ink); min-width: 110px; }
.set-note {
  margin: 2px 0 0;
  font-weight: 800;
  color: var(--primary-d);
  background: #e7f3ee;
  border: 2px dashed var(--primary);
  border-radius: 10px;
  padding: 6px 12px;
  font-size: .86rem;
  align-self: flex-start;
}

/* ---------- Chips ---------- */
.chip-row { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  border: var(--border);
  background: var(--card);
  border-radius: 11px;
  padding: 8px 14px;
  font-size: 1rem;
  font-weight: 800;
  font-family: inherit;
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 3px 0 rgba(38,55,77,.12);
  transition: transform .08s, box-shadow .08s, background .12s;
}
.chip:active { transform: translateY(2px); box-shadow: none; }
.chip.active {
  background: var(--primary);
  border-color: var(--primary-d);
  color: #fff;
  box-shadow: 0 3px 0 var(--primary-d);
}
.chips-small .chip { padding: 8px 12px; min-width: 46px; text-align: center; }

/* ---------- Palco / tabuleiro ---------- */
.stage { display: flex; flex-direction: column; align-items: center; gap: 16px; }

.board-wrap {
  position: relative;
  background-color: var(--card);
  /* quadriculado da folha de cálculo */
  background-image:
    linear-gradient(rgba(43,74,110,.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43,74,110,.09) 1px, transparent 1px);
  background-size: 22px 22px;
  border: var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: clamp(16px, 4vw, 28px);
  width: 100%;
  display: flex;
  justify-content: center;
  overflow-x: auto;
}
/* margem vermelha do caderno */
.board-wrap::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 26px;
  width: 2px;
  background: rgba(224, 49, 49, .28);
}

.board { display: flex; flex-direction: column; align-items: center; gap: 2px; position: relative; }

.grid-row {
  display: grid;
  grid-template-columns: repeat(var(--cols), var(--cell));
  gap: var(--gap);
  align-items: center;
  justify-content: center;
}
.grid-row.carry { height: calc(var(--cell) * .62); margin-bottom: -2px; }
.grid-row.sep { height: 0; }

.cell {
  width: var(--cell);
  height: var(--cell);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(var(--cell) * .52);
  font-weight: 800;
}
/* algarismos do enunciado — escritos à mão, a tinta */
.cell.given { color: var(--ink); font-family: var(--hand); font-weight: 400; font-size: calc(var(--cell) * .62); }
.cell.symbol { color: var(--accent); font-family: var(--hand); font-size: calc(var(--cell) * .66); }
.cell.zero { color: var(--ink-soft); font-family: var(--hand); opacity: .5; }
.cell.empty { visibility: hidden; }

/* quadradinhos de resposta */
.digit-input {
  width: var(--cell);
  height: var(--cell);
  border: 2.5px solid #b9c6d6;
  border-radius: 10px;
  background: #fdfeff;
  text-align: center;
  font-size: calc(var(--cell) * .5);
  font-weight: 900;
  color: var(--primary-d);
  font-family: var(--font);
  outline: none;
  transition: border-color .12s, background .12s, transform .08s, box-shadow .08s;
  caret-color: var(--primary);
}
.digit-input:focus {
  border-color: var(--primary);
  background: #eefaf4;
  transform: translateY(-2px);
  box-shadow: 0 4px 0 rgba(31,122,99,.25);
}

/* o quadradinho do transporte — marcador amarelo, lápis laranja */
.carry-cell { justify-content: center; align-items: flex-end; }
.carry-input {
  width: calc(var(--cell) * .58);
  height: calc(var(--cell) * .58);
  border: 2px dashed var(--carry);
  border-radius: 8px;
  background: var(--carry-bg);
  text-align: center;
  font-size: calc(var(--cell) * .36);
  font-weight: 900;
  color: var(--carry-ink);
  font-family: var(--font);
  outline: none;
  transition: border-color .12s, transform .08s, box-shadow .08s;
}
.carry-input:focus {
  border-style: solid;
  transform: translateY(-2px) scale(1.06);
  box-shadow: 0 3px 0 rgba(240,140,0,.35);
}

/* estados */
.digit-input.ok, .carry-input.ok { border-color: var(--green); border-style: solid; background: var(--green-bg); color: var(--green); }
.digit-input.bad, .carry-input.bad { border-color: var(--red); border-style: solid; background: var(--red-bg); color: var(--red); animation: shake .38s; }
.digit-input.hintme, .carry-input.hintme { animation: pulse 1s infinite; border-color: var(--accent); }

@keyframes shake { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-5px)} 40%{transform:translateX(5px)} 60%{transform:translateX(-4px)} 80%{transform:translateX(4px)} }
@keyframes pulse { 0%,100%{box-shadow:0 0 0 0 rgba(232,89,12,.5)} 50%{box-shadow:0 0 0 8px rgba(232,89,12,0)} }
@keyframes popin { from{transform:scale(.5);opacity:0} to{transform:scale(1);opacity:1} }

/* linha do algoritmo — traço de tinta */
.rule {
  height: 4px;
  background: var(--ink);
  border-radius: 3px;
  margin: 7px 0;
  animation: growline .3s ease;
}
@keyframes growline { from{transform:scaleX(0)} to{transform:scaleX(1)} }

/* ---------- Feedback (nota autocolante) ---------- */
.feedback {
  width: 100%;
  min-height: 56px;
  background: var(--card);
  border: var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  font-size: 1.05rem;
  font-weight: 700;
  border-left-width: 8px;
  transition: border-color .2s, background .2s;
}
.fb-emoji { font-size: 1.7rem; animation: popin .3s; }
.feedback.good { border-color: var(--green); background: var(--green-bg); }
.feedback.almost { border-color: var(--carry); background: var(--carry-bg); }
.feedback.oops { border-color: var(--red); background: var(--red-bg); }

.step-caption {
  width: 100%;
  background: var(--ink);
  color: #fdfaf0;
  border-radius: 12px;
  padding: 12px 16px;
  font-family: var(--hand);
  font-size: 1.25rem;
  text-align: center;
  animation: popin .25s;
  box-shadow: var(--shadow);
}

/* ---------- Botões ---------- */
.controls { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; width: 100%; }
.btn {
  border: var(--border);
  border-radius: 13px;
  padding: 12px 18px;
  font-size: 1.05rem;
  font-weight: 800;
  font-family: inherit;
  cursor: pointer;
  transition: transform .08s, box-shadow .08s, filter .1s;
}
.btn:active { transform: translateY(3px); box-shadow: none !important; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary-d); box-shadow: 0 4px 0 var(--primary-d); }
.btn-soft { background: var(--carry-bg); color: var(--carry-ink); border-color: var(--carry); box-shadow: 0 4px 0 var(--carry); }
.btn-ghost { background: var(--card); color: var(--ink); box-shadow: 0 4px 0 rgba(38,55,77,.18); }
.btn.pulse-cta { animation: cta 1.1s infinite; }
@keyframes cta { 0%,100%{transform:scale(1)} 50%{transform:scale(1.05)} }

/* ---------- Teclado ---------- */
.keypad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; width: 100%; max-width: 340px; }
.key {
  border: var(--border);
  background: var(--card);
  border-radius: 12px;
  padding: 15px 0;
  font-size: 1.4rem;
  font-weight: 900;
  font-family: var(--font);
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 4px 0 rgba(38,55,77,.16);
  transition: transform .07s, box-shadow .07s;
}
.key:active { transform: translateY(3px); box-shadow: none; }
.key-wide { font-size: 1rem; color: var(--red); }
.key-next { background: var(--primary); color: #fff; border-color: var(--primary-d); box-shadow: 0 4px 0 var(--primary-d); }

/* ---------- Rodapé ---------- */
.foot { margin-top: auto; padding-top: 20px; text-align: center; color: var(--ink-soft); font-size: .82rem; display: flex; flex-direction: column; gap: 4px; }
.foot .credit { font-family: var(--hand); font-size: 1rem; color: var(--primary); }
.foot .credit a { color: inherit; text-decoration: none; }
.foot .credit a:hover { text-decoration: underline; }

/* ---------- Festa / confetti ---------- */
.party { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 40; }
.confetti { position: absolute; top: -40px; font-size: 1.6rem; animation: fall linear forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(540deg); opacity: .9; } }

@media (max-width: 420px) {
  .brand-text p { display: none; }
  .stat-lbl { display: none; }
  .brand-text h1 { font-size: 1.6rem; }
  .board-wrap::before { left: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001s !important; }
}