:root {
  color-scheme: dark;
  --fundo: #07141a;
  --cartao: #12262f;
  --linha: #1c3540;
  --texto: #e8f1f0;
  --fraco: #8fa8b0;
  --destaque: #2dd4a7;
  --apoio: #5eead4;
  --vermelho: #ff9a8c;
  --clara: #e6e1d6;
  --escura: #8c7f6c;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--fundo);
  color: var(--texto);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-tap-highlight-color: transparent;
  padding-bottom: env(safe-area-inset-bottom);
}
a { color: var(--apoio); text-decoration: none; }

.topo {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 16px; border-bottom: 1px solid var(--linha);
  position: sticky; top: 0; background: rgba(15, 17, 22, .94);
  backdrop-filter: blur(10px); z-index: 20;
}
.marca { font: 700 11px ui-monospace, Consolas, monospace; letter-spacing: .16em; color: var(--destaque); }
.topo nav { margin-left: auto; display: flex; align-items: center; gap: 12px; font-size: 13px; }
.conta { color: var(--fraco); font-size: 12px; }

.app { display: grid; gap: 16px; padding: 16px; max-width: 1080px; margin: 0 auto; }

/* ------------------------------------------------ tabuleiro */
.tabuleiro-area { display: grid; gap: 10px; }
.tabuleiro-envolucro { position: relative; width: 100%; max-width: 560px; margin: 0 auto; }
.tabuleiro {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  aspect-ratio: 1;
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--linha);
  touch-action: manipulation;
  user-select: none;
}
.casa {
  position: relative;
  display: grid;
  place-items: center;
  font-size: clamp(20px, 6.4vw, 42px);
  line-height: 1;
  cursor: pointer;
}
.casa.clara { background: var(--clara); color: #1b1d21; }
.casa.escura { background: var(--escura); color: #08202a; }
.casa .coord {
  position: absolute; bottom: 1px; right: 3px;
  font: 600 9px ui-monospace, Consolas, monospace; opacity: .45;
}
.casa .coord-arquivo {
  position: absolute; bottom: 1px; left: 3px;
  font: 600 9px ui-monospace, Consolas, monospace; opacity: .45;
}
.casa.origem { box-shadow: inset 0 0 0 4px rgba(240, 200, 117, .95); }
.casa.destino { box-shadow: inset 0 0 0 4px rgba(167, 235, 200, .95); }
.casa.ultimo { background-image: linear-gradient(rgba(240, 200, 117, .35), rgba(240, 200, 117, .35)); }
.casa.selecionada { box-shadow: inset 0 0 0 4px rgba(167, 235, 200, .95); }
.casa.jogavel::after {
  content: ""; position: absolute; width: 26%; height: 26%;
  border-radius: 50%; background: rgba(20, 22, 26, .28);
}
.casa.jogavel.ocupada::after {
  width: 84%; height: 84%; background: transparent;
  border: 4px solid rgba(20, 22, 26, .28);
}
.casa.em-xeque { background-image: radial-gradient(circle, rgba(241, 154, 142, .9), transparent 70%); }

.setas { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.setas line { stroke: var(--destaque); stroke-width: 10; stroke-linecap: round; filter: drop-shadow(0 2px 4px rgba(0,0,0,.4)); opacity: 0; }
.setas line.visivel { opacity: .92; }

.barra { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.barra button {
  min-width: 46px; min-height: 42px; padding: 0 12px;
  background: var(--cartao); border: 1px solid var(--linha); color: var(--fraco);
  border-radius: 10px; font-size: 17px; cursor: pointer;
}
.barra button:hover, .barra button.ativo { border-color: var(--destaque); color: var(--destaque); }

/* ------------------------------------------------ painel */
.painel { display: grid; gap: 12px; }
.cartao { background: var(--cartao); border: 1px solid var(--linha); border-radius: 14px; padding: 15px; }
.linha-titulo { display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px; }
.vez { font-weight: 600; }
.vez.pretas { color: var(--destaque); }
.vez.brancas { color: var(--texto); }
.nota { margin-left: auto; font: 700 17px ui-monospace, Consolas, monospace; color: var(--apoio); }
.nota.negativa { color: var(--vermelho); }

button.principal {
  width: 100%; padding: 15px; border: 0; border-radius: 11px;
  background: var(--apoio); color: #10211a; font: inherit; font-weight: 800; font-size: 15px; cursor: pointer;
}
button.principal:disabled { opacity: .6; cursor: wait; }
button.sec {
  padding: 10px 14px; background: #16303b; border: 0; border-radius: 9px;
  color: #cfe0e0; font: inherit; font-weight: 600; font-size: 13px; cursor: pointer;
}
.alternador { display: flex; align-items: center; gap: 8px; margin-top: 12px; color: var(--fraco); font-size: 13px; cursor: pointer; }
.alternador input { width: auto; accent-color: var(--apoio); }
.status { margin: 10px 0 0; color: var(--fraco); font-size: 12.5px; min-height: 18px; }

.resultado .melhor { display: flex; align-items: baseline; gap: 10px; }
.resultado .melhor strong { font: 700 24px ui-monospace, Consolas, monospace; color: var(--destaque); }
.resultado .melhor span { margin-left: auto; font: 700 14px ui-monospace, Consolas, monospace; color: var(--apoio); }
.explicacao { margin: 10px 0 0; color: #cfe0e0; font-size: 13.5px; }
.continuacao { margin-top: 12px; padding-top: 11px; border-top: 1px solid rgba(255,255,255,.08); }
.continuacao code { display: block; margin-top: 4px; color: #cfe0e0; font: 12.5px/1.7 ui-monospace, Consolas, monospace; word-break: break-word; }
.rotulo-mini { color: var(--fraco); font: 600 10px ui-monospace, Consolas, monospace; text-transform: uppercase; letter-spacing: .1em; }
.alternativas { display: grid; gap: 6px; margin-top: 12px; }
.alternativa {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px;
  padding: 9px 11px; background: rgba(255,255,255,.05); border: 1px solid transparent;
  border-radius: 9px; color: var(--texto); text-align: left; cursor: pointer; font: inherit;
}
.alternativa:hover, .alternativa.ativa { border-color: var(--destaque); background: rgba(240,200,117,.12); }
.alternativa b { font: 700 14px ui-monospace, Consolas, monospace; color: var(--destaque); }
.alternativa em { font: 600 12px ui-monospace, Consolas, monospace; font-style: normal; color: var(--apoio); }
.alternativa .linha { color: var(--fraco); font: 11.5px ui-monospace, Consolas, monospace; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.fen-linha { display: flex; gap: 8px; margin-top: 8px; }
.fen-linha input {
  flex: 1; min-width: 0; background: #0a1c23; border: 1px solid #1c3540; color: var(--texto);
  border-radius: 9px; padding: 11px; font: 12px ui-monospace, Consolas, monospace;
}
.fen-linha input:focus { outline: 2px solid var(--apoio); outline-offset: 1px; }
.fen-linha button {
  width: 44px; background: var(--cartao); border: 1px solid var(--linha); color: var(--fraco);
  border-radius: 9px; font-size: 16px; cursor: pointer;
}
.acoes-fen { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }

.lances { list-style: none; margin: 8px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.lances li {
  padding: 5px 9px; background: rgba(255,255,255,.05); border-radius: 7px;
  font: 12.5px ui-monospace, Consolas, monospace; cursor: pointer;
}
.lances li.par { color: var(--fraco); }
.lances li.atual { background: rgba(167,235,200,.16); color: var(--apoio); }
.lances .vazio { color: var(--fraco); font-style: normal; }

/* ------------------------------------------------ paleta de edicao */
.paleta {
  position: sticky; bottom: 0; z-index: 15;
  background: rgba(21, 24, 33, .97); border-top: 1px solid var(--linha);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  backdrop-filter: blur(10px);
}
.pecas { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.pecas button {
  width: 46px; height: 46px; font-size: 26px; line-height: 1;
  background: var(--clara); color: #08202a; border: 2px solid transparent; border-radius: 9px; cursor: pointer;
}
.pecas button.escura { background: var(--escura); color: #e8f1f0; }
.pecas button.escolhida { border-color: var(--destaque); }
.pecas button.borracha { background: #16303b; color: var(--fraco); }

/* ------------------------------------------------ desktop */
@media (min-width: 900px) {
  .app { grid-template-columns: minmax(0, 1fr) 380px; align-items: start; padding: 22px; }
  .tabuleiro-envolucro { max-width: none; }
  .painel { position: sticky; top: 76px; }
}

/* Acabamento da área de estudo: leitura confortável e controles de toque. */
:root { --cartao:#171c25; --linha:#26485a; --fraco:#a8bec6; }
[hidden] { display:none !important; }
a, button, input, label { touch-action:manipulation; }
:focus-visible { outline:3px solid var(--destaque); outline-offset:3px; }
.topo { min-height:68px; padding:12px max(20px,calc((100vw - 1120px)/2)); }
.topo a { min-height:44px; display:inline-flex; align-items:center; }
.app-intro { max-width:1120px; margin:0 auto; padding:30px 22px 10px; display:flex; align-items:center; justify-content:space-between; gap:20px; }
.app-intro h1 { font-size:clamp(24px,3vw,32px); line-height:1.2; letter-spacing:-.035em; margin:8px 0; }
.app-intro p { color:var(--fraco); margin:0; font-size:14px; }
.app-intro .rotulo-mini { color:var(--destaque); }
.app-intro button { white-space:nowrap; }
.app { max-width:1120px; gap:24px; }
.tabuleiro-area { min-width:0; align-content:start; overflow-x:auto; padding:4px; }
.tabuleiro-envolucro { min-width:352px; }
.tabuleiro { border-radius:8px; border:0; }
.linha-tabuleiro { display:contents; }
.casa { padding:0; border:0; border-radius:0; min-width:44px; min-height:44px; font-family:"Segoe UI Symbol","DejaVu Sans",sans-serif; font-size:clamp(30px,6.4vw,46px); }
.casa:focus-visible { outline:3px solid #111827; outline-offset:-5px; z-index:1; }
.casa .coord,.casa .coord-arquivo { color:#08202a; opacity:1; font-size:10px; line-height:1; }
.casa .coord-arquivo { bottom:auto; top:3px; }
.casa.selecionada { box-shadow:inset 0 0 0 4px #164c37; }
.casa.jogavel::after { background:rgba(13,33,26,.48); }
.casa.jogavel.ocupada::after { border-color:rgba(13,33,26,.6); background:transparent; }
.barra { padding:8px 0; gap:8px; }
.barra button { min-width:44px; min-height:44px; color:#dae0e9; font-size:20px; }
.barra button:disabled { opacity:.4; cursor:default; }
.barra button:active:not(:disabled),button.sec:active,button.principal:active { transform:translateY(1px); }
.atalhos-tabuleiro { font-size:12px; text-align:center; color:var(--fraco); margin:0 0 8px; }
.painel { gap:16px; align-content:start; }
.cartao { padding:22px; border-radius:14px; }
button.principal { min-height:50px; background:var(--destaque); color:#04231a; }
button.principal:hover:not(:disabled) { background:#ffda91; }
button.sec { min-height:44px; border:1px solid #26485a; }
.alternador { min-height:44px; margin-top:10px; justify-content:space-between; flex-direction:row-reverse; }
.alternador input { appearance:none; width:38px; height:22px; border-radius:20px; background:#3f4857; border:1px solid #798293; flex:none; position:relative; cursor:pointer; }
.alternador input::after { content:""; display:block; width:16px; height:16px; border-radius:50%; background:#eef0f3; position:absolute; top:2px; left:2px; }
.alternador input:checked { background:var(--destaque); border-color:var(--destaque); }
.alternador input:checked::after { left:18px; background:#302719; }
.status { border-top:1px solid var(--linha); padding-top:12px; line-height:1.65; min-height:40px; }
.status.erro { color:#ffb4a8; }
.status-acao { display:inline-flex; align-items:center; min-height:44px; font-size:13px; text-decoration:underline; color:var(--destaque); }
.resultado { border-color:#78633b; background:#211f19; }
.resultado .melhor { margin-top:12px; }
.resultado .melhor strong { font-size:34px; }
.resultado .melhor span { font-size:19px; }
.resultado .melhor span.negativa { color:var(--vermelho); }
.roque-aviso { padding:12px; border-left:3px solid var(--destaque); background:#352e20; color:#ffdda0; font-size:13px; }
.continuacao code { font-size:14px; padding:10px 12px; background:#151719; border-radius:8px; }
.alternativa { min-height:48px; }
.rotulo-mini { font-size:11px; }
.fen-linha input { font-size:14px; min-height:46px; }
.fen-linha input[aria-invalid=true] { border-color:var(--vermelho); }
.fen-linha button { flex:none; min-height:44px; }
.lances { max-height:230px; overflow:auto; }
.lances li { padding:0; background:transparent; }
.lances li button { min-height:44px; padding:9px 12px; border:1px solid #26485a; border-radius:8px; background:#16303b; color:inherit; cursor:pointer; font:13px ui-monospace,Consolas,monospace; }
.lances li.atual button { border-color:var(--destaque); background:#30291b; color:var(--destaque); }
.lances li.vazio { border:1px dashed #26485a; border-radius:9px; background:transparent; padding:18px 16px; width:100%; font:13px/1.6 system-ui,sans-serif; }
.paleta { border-color:#576275; box-shadow:0 -10px 35px #0004; }
.pecas button { min-width:46px; min-height:46px; }
.pecas button.escolhida { outline:2px solid var(--destaque); outline-offset:2px; }
.promocao { z-index:40; width:calc(100% - 32px); }
@media(min-width:900px) { .painel{position:static}.app{grid-template-columns:minmax(0,1fr) 380px}.tabuleiro-area{position:sticky;top:82px} }
@media(max-width:600px) { .topo{padding:8px 16px;flex-wrap:wrap;gap:0}.topo nav{gap:12px}.conta{max-width:180px;line-height:1.4}.app-intro{padding:24px 16px 8px;align-items:start;flex-wrap:wrap;gap:14px}.app-intro p{font-size:13px}.app{padding:12px;gap:16px}.cartao{padding:20px}.fen-linha input{font-size:16px}.app-intro h1{font-size:26px} }
@media(prefers-reduced-motion:reduce) { *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important} }

/* Seletor de nível das dicas. */
.campo-nivel { display: block; margin-top: 14px; }
.campo-nivel select {
  width: 100%;
  margin-top: 6px;
  background: #0a1c23;
  border: 1px solid #1c3540;
  color: var(--texto);
  border-radius: 9px;
  padding: 11px;
  font: inherit;
  min-height: 44px;
}
.campo-nivel select:focus-visible { outline: 2px solid var(--apoio); outline-offset: 2px; }


/* Contato flutuante. */
.zap-flutuante {
  position: fixed;
  right: 16px;
  bottom: calc(16px + env(safe-area-inset-bottom));
  z-index: 30;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: #25d366;
  color: #08240f;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .35);
  text-decoration: none;
}
.zap-flutuante:hover { background: #4ade80; }
@media (min-width: 900px) { .zap-flutuante { right: 24px; bottom: 24px; } }