:root {
  color-scheme: light;
  --ground: #f3f4ef;
  --surface: #fbfbf8;
  --ink: #1d2420;
  --muted: #5f6b64;
  --line: #d9ddd3;
  --board-light: #e9eddc;
  --board-dark: #7c9a83;
  --gold: #c99412;
  --gold-soft: #f5e7bf;
  --ok: #2f9e44;
  --bad: #d9480f;
  --select: rgb(201 148 18 / 0.55);
  --last: rgb(201 148 18 / 0.32);
  --check: rgb(217 72 15 / 0.75);
  --dest: rgb(29 36 32 / 0.28);
  --arrow: rgb(201 148 18 / 0.85);
  --font-display: "Zilla Slab", Rockwell, "Courier New", Georgia, serif;
  --font-body: "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --ground: #121614;
    --surface: #1a201d;
    --ink: #e6ebe7;
    --muted: #98a59e;
    --line: #2d3531;
    --board-light: #c9d1bf;
    --board-dark: #5d7a64;
    --gold: #e0ad2e;
    --gold-soft: #3a3220;
    --ok: #51cf66;
    --bad: #ff8a4c;
    --dest: rgb(10 14 12 / 0.4);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --ground: #121614;
  --surface: #1a201d;
  --ink: #e6ebe7;
  --muted: #98a59e;
  --line: #2d3531;
  --board-light: #c9d1bf;
  --board-dark: #5d7a64;
  --gold: #e0ad2e;
  --gold-soft: #3a3220;
  --ok: #51cf66;
  --bad: #ff8a4c;
  --dest: rgb(10 14 12 / 0.4);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--ground);
  color: var(--ink);
  font: 17px/1.55 var(--font-body);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }

/* ---------- barra do topo ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 12px 24px; flex-wrap: wrap;
  padding: 12px max(16px, env(safe-area-inset-left, 0px));
  background: color-mix(in srgb, var(--ground) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-mark { width: 30px; height: 30px; }
.brand-name { font: 700 22px/1 var(--font-display); letter-spacing: 0.01em; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  padding: 8px 14px; border-radius: 999px; text-decoration: none; font-weight: 700; font-size: 15px; color: var(--muted);
}
.nav a:hover { color: var(--ink); background: var(--surface); }
.nav a[aria-current="page"] { color: var(--ink); background: var(--gold-soft); }
.streak { display: flex; align-items: center; gap: 6px; font: 700 14px/1 var(--font-mono); color: var(--muted); }
.streak b { color: var(--gold); font-size: 16px; }
@media (max-width: 640px) {
  /* no celular: uma linha só e sem grudar no topo, para o tabuleiro caber inteiro */
  .topbar { position: static; flex-wrap: nowrap; gap: 8px; padding: 8px 12px; backdrop-filter: none; }
  .brand-mark { width: 26px; height: 26px; }
  .brand-name { font-size: 17px; white-space: nowrap; }
  .hero .btn-row .btn:not(.primary) { padding-inline: 14px; }
  .nav { gap: 0; }
  .nav a { padding: 7px 9px; font-size: 14px; }
  .streak { font-size: 0; gap: 0; }
  .streak b { font-size: 14px; }
  .streak b::after { content: "d"; font-size: 11px; color: var(--muted); margin-left: 1px; }
}
@media (max-width: 420px) { .brand-name { display: none; } }

main { max-width: 1180px; margin: 0 auto; padding: 24px 16px 64px; }

/* ---------- layout de treino: tabuleiro + painel ---------- */
.trainer { display: grid; grid-template-columns: minmax(0, 560px) minmax(0, 1fr); gap: 32px; align-items: start; }
.trainer .side { display: grid; gap: 16px; align-content: start; }
@media (max-width: 860px) {
  .trainer { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  main { padding: 12px 12px 48px; }
}

.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 18px 20px; }
.eyebrow { margin: 0 0 6px; font: 700 12px/1.2 var(--font-body); letter-spacing: 0.09em; text-transform: uppercase; color: var(--muted); }
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.15; text-wrap: balance; margin: 0; }
h1 { font-size: clamp(30px, 5vw, 44px); }
h2 { font-size: 26px; }
h3 { font-size: 20px; }
.lead { font-size: 19px; color: var(--muted); max-width: 60ch; margin: 10px 0 0; }
.prose p { margin: 0 0 12px; max-width: 62ch; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { font-weight: 700; }
.notation { font-family: var(--font-mono); font-size: 0.92em; background: var(--ground); padding: 1px 5px; border-radius: 4px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 10px 18px; border-radius: 8px; border: 1.5px solid var(--line);
  background: var(--surface); font-weight: 700; cursor: pointer; text-decoration: none;
}
.btn:hover { border-color: var(--ink); }
.btn.primary { background: var(--ink); color: var(--ground); border-color: var(--ink); }
.btn.primary:hover { opacity: 0.9; }
.btn.gold { background: var(--gold); color: #1d1606; border-color: var(--gold); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; }

.feedback { display: flex; gap: 10px; align-items: flex-start; padding: 12px 14px; border-radius: 8px; font-weight: 700; }
.feedback.ok { background: color-mix(in srgb, var(--ok) 16%, var(--surface)); color: var(--ink); border-left: 4px solid var(--ok); }
.feedback.bad { background: color-mix(in srgb, var(--bad) 14%, var(--surface)); color: var(--ink); border-left: 4px solid var(--bad); }
.feedback.info { background: var(--gold-soft); border-left: 4px solid var(--gold); }
.feedback span { font-weight: 400; }

.progressbar { height: 8px; border-radius: 4px; background: var(--line); overflow: hidden; }
.progressbar > i { display: block; height: 100%; background: var(--gold); transition: width 0.3s; }
.steps { display: flex; gap: 6px; }
.steps i { flex: 1; height: 6px; border-radius: 3px; background: var(--line); }
.steps i.done { background: var(--gold); }
.steps i.now { background: var(--ink); }

/* ---------- tabuleiro ---------- */
.board-wrap { position: relative; width: 100%; max-width: 560px; }
.board {
  position: relative; width: 100%; aspect-ratio: 1; max-width: 100%;
  border-radius: 6px; overflow: hidden; touch-action: none; user-select: none; -webkit-user-select: none;
  box-shadow: 0 1px 0 var(--line), 0 10px 30px rgb(0 0 0 / 0.12);
}
.board .sq { position: absolute; width: 12.5%; height: 12.5%; }
.board .sq.l { background: var(--board-light); }
.board .sq.d { background: var(--board-dark); }
.board .sq.last::after, .board .sq.sel::after, .board .sq.chk::after, .board .sq.hint::after { content: ""; position: absolute; inset: 0; }
.board .sq.last::after { background: var(--last); }
.board .sq.sel::after { background: var(--select); }
.board .sq.hint::after { box-shadow: inset 0 0 0 4px var(--gold); }
.board .sq.chk::after { background: radial-gradient(circle, var(--check) 0%, rgb(217 72 15 / 0.35) 45%, transparent 72%); }
.board .sq.ok::after { content: ""; position: absolute; inset: 0; background: rgb(47 158 68 / 0.45); }
.board .sq.bad::after { content: ""; position: absolute; inset: 0; background: rgb(217 72 15 / 0.5); }
.board .dest { position: absolute; width: 12.5%; height: 12.5%; pointer-events: none; display: grid; place-items: center; z-index: 3; }
.board .dest::before { content: ""; width: 30%; height: 30%; border-radius: 50%; background: var(--dest); }
.board .dest.cap::before { width: 92%; height: 92%; background: transparent; border: 5px solid var(--dest); }
.board .coord { position: absolute; font: 700 11px/1 var(--font-mono); pointer-events: none; z-index: 1; }
.board .coord.file { bottom: 3px; right: 4px; }
.board .coord.rank { top: 4px; left: 4px; }
.board .sq.l .coord { color: var(--board-dark); }
.board .sq.d .coord { color: var(--board-light); }
.board .piece {
  position: absolute; width: 12.5%; height: 12.5%; z-index: 4; pointer-events: none;
  background-size: 100% 100%; will-change: transform;
  transition: transform 0.18s ease;
}
.board .piece.drag { transition: none; z-index: 10; filter: drop-shadow(0 6px 8px rgb(0 0 0 / 0.35)); }
.board .piece.fade { opacity: 0.35; }
.board .target {
  position: absolute; width: 12.5%; height: 12.5%; z-index: 2; pointer-events: none; display: grid; place-items: center;
}
.board .target svg { width: 52%; height: 52%; filter: drop-shadow(0 1px 1px rgb(0 0 0 / 0.25)); }
.board svg.arrows { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 6; pointer-events: none; }
@media (prefers-reduced-motion: reduce) { .board .piece { transition: none; } }

.promo {
  position: absolute; inset: 0; z-index: 20; display: grid; place-items: center; background: rgb(0 0 0 / 0.45); border-radius: 6px;
}
.promo-box { display: flex; gap: 6px; padding: 10px; background: var(--surface); border-radius: 10px; }
.promo-box button { width: 64px; height: 64px; border: 1.5px solid var(--line); border-radius: 8px; background: var(--ground) center/86% no-repeat; cursor: pointer; }
.promo-box button:hover { border-color: var(--gold); }

.board-tools { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-top: 10px; color: var(--muted); font-size: 14px; }
.icon-btn { width: 40px; height: 40px; display: grid; place-items: center; border: 1.5px solid var(--line); border-radius: 8px; background: var(--surface); cursor: pointer; }
.icon-btn:hover { border-color: var(--ink); }

/* ---------- trilha (início) ---------- */
.hero { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 32px; align-items: center; margin-bottom: 36px; }
.hero-board { max-width: 340px; justify-self: end; width: 100%; }
@media (max-width: 860px) { .hero { grid-template-columns: 1fr; } .hero-board { justify-self: start; max-width: 260px; } }
.stats { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.stat { min-width: 130px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.stat dt { font-size: 13px; color: var(--muted); }
.stat dd { margin: 2px 0 0; font: 700 26px/1.1 var(--font-display); font-variant-numeric: tabular-nums; }

.level { margin-top: 28px; }
.level-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.level-head p { margin: 4px 0 0; color: var(--muted); }
.level-count { font: 700 14px/1 var(--font-mono); color: var(--muted); }
.lessons { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.lesson-card {
  position: relative; display: grid; gap: 4px; padding: 14px 16px 14px 52px; min-height: 76px;
  border: 1.5px solid var(--line); border-radius: 10px; background: var(--surface); text-decoration: none;
}
.lesson-card:hover { border-color: var(--ink); }
.lesson-card .num {
  position: absolute; left: 14px; top: 14px; width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center; font: 700 13px/1 var(--font-mono); background: var(--ground); border: 1.5px solid var(--line);
}
.lesson-card.done .num { background: var(--gold); border-color: var(--gold); color: #1d1606; }
.lesson-card.next { border-color: var(--gold); box-shadow: 0 0 0 3px var(--gold-soft); }
.lesson-card .t { font-weight: 700; line-height: 1.25; }
.lesson-card .d { font-size: 14px; color: var(--muted); line-height: 1.35; }

.choices { display: grid; gap: 8px; }
.choice { text-align: left; padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 8px; background: var(--surface); cursor: pointer; font-weight: 700; }
.choice:hover { border-color: var(--ink); }
.choice.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 14%, var(--surface)); }
.choice.wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 12%, var(--surface)); }

.moves { font: 14px/1.7 var(--font-mono); max-height: 180px; overflow-y: auto; }
.moves span { padding: 1px 4px; border-radius: 4px; }
.moves .n { color: var(--muted); padding-right: 2px; }
.review-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.review-list button { width: 100%; text-align: left; padding: 10px 12px; border: 1.5px solid var(--line); border-radius: 8px; background: var(--surface); cursor: pointer; }
.review-list button:hover { border-color: var(--ink); }
.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; font-weight: 700; }
.tag.blunder { background: color-mix(in srgb, var(--bad) 22%, var(--surface)); color: var(--bad); }
.tag.mistake { background: var(--gold-soft); color: var(--gold); }
.seg { display: inline-flex; padding: 3px; gap: 2px; border-radius: 8px; background: var(--ground); border: 1px solid var(--line); flex-wrap: wrap; }
.seg button { border: 0; background: transparent; padding: 7px 12px; border-radius: 6px; font-weight: 700; cursor: pointer; color: var(--muted); }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 0 0 1px var(--line); }
.evalbar { height: 8px; border-radius: 4px; background: #2b2f2c; overflow: hidden; }
.evalbar > i { display: block; height: 100%; background: #f1f1ec; transition: width 0.4s; }
.footer { max-width: 1180px; margin: 0 auto; padding: 24px 16px 40px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }
.footer p { margin: 0 0 6px; max-width: 80ch; }

@media (max-width: 640px) {
  .stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
  .stat { min-width: 0; padding: 10px 12px; }
  .stat dt { font-size: 12px; }
}

/* comentários das linhas de abertura */
.notas { display: grid; gap: 8px; margin-top: 12px; }
.notas p { margin: 0; padding: 10px 12px; border-left: 3px solid var(--gold); background: var(--gold-soft); border-radius: 0 6px 6px 0; font-size: 15px; line-height: 1.45; }
.notas .notation { margin-right: 4px; }

/* lição: no computador, cabeçalho e painel ficam à direita do tabuleiro;
   no celular, o cabeçalho sobe para cima do tabuleiro e as instruções vêm logo abaixo */
.trainer.licao { grid-template-areas: "board head" "board side"; grid-template-rows: auto 1fr; row-gap: 16px; }
.trainer.licao .lesson-head { grid-area: head; }
.trainer.licao .lesson-board { grid-area: board; }
.trainer.licao .side { grid-area: side; }
.lesson-head .steps { margin-top: 14px; }
@media (max-width: 860px) {
  .trainer.licao { grid-template-areas: "head" "board" "side"; grid-template-rows: auto; row-gap: 10px; }
  .trainer.licao .lesson-head { padding: 10px 14px; display: grid; grid-template-columns: 1fr auto; align-items: center; column-gap: 12px; }
  .trainer.licao .lesson-head .eyebrow { grid-column: 1 / -1; margin: 0; font-size: 11px; }
  .trainer.licao .lesson-head h2 { font-size: 20px; margin: 2px 0 0; }
  .trainer.licao .lesson-head .steps { margin: 0; width: min(38vw, 160px); }
  .trainer.licao .side { gap: 10px; }
  .trainer.licao #passo { padding: 12px 14px; }
}

/* contador da revisão no menu */
.badge { display: inline-block; min-width: 18px; margin-left: 5px; padding: 1px 5px; border-radius: 999px; background: var(--gold); color: #fff; font: 700 11px/16px var(--font-mono); text-align: center; vertical-align: 1px; }

/* código de progresso */
.codigo textarea { width: 100%; margin: 12px 0 0; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); font: 13px/1.4 var(--font-mono); resize: vertical; word-break: break-all; }
.codigo .btn-row { margin-top: 12px; }
.codigo #cod-fb { margin-top: 12px; }
@media (max-width: 860px) {
  .trainer.licao #passo p { margin: 0 0 8px; }
  .trainer.licao .choices { gap: 8px; margin-top: 8px; }
  .trainer.licao .choice { padding: 10px 14px; font-size: 16px; }
  .trainer.licao .feedback { padding: 10px 14px; }
}

/* meta do dia */
.meta-dia { margin-top: 14px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); max-width: 460px; }
.meta-dia .meta-topo { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 8px; font-size: 15px; }
.meta-dia .meta-topo span { color: var(--muted); font-variant-numeric: tabular-nums; }
.meta-dia p { margin: 8px 0 0; font-size: 12px; color: var(--muted); }
.meta-dia.ok { border-color: var(--gold); background: color-mix(in srgb, var(--gold-soft) 60%, var(--surface)); }
.streak.meta-ok b { color: var(--surface); background: var(--gold); border-radius: 999px; padding: 2px 7px; }

/* conquistas */
.conquistas { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; }
.conquista { display: grid; grid-template-columns: 36px 1fr; column-gap: 10px; align-items: center; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); opacity: 0.55; }
.conquista .ic { grid-row: span 2; width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; background: var(--line); font-size: 18px; filter: grayscale(1); }
.conquista .t { font-weight: 700; font-size: 14px; line-height: 1.2; }
.conquista .d { font-size: 12px; color: var(--muted); line-height: 1.3; }
.conquista.ganha { opacity: 1; border-color: color-mix(in srgb, var(--gold) 50%, var(--line)); }
.conquista.ganha .ic { background: var(--gold-soft); filter: none; }
@media (max-width: 640px) { .conquistas { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* avisos (conquista nova, meta batida) */
.avisos { position: fixed; left: 50%; bottom: max(16px, env(safe-area-inset-bottom)); transform: translateX(-50%); z-index: 50; display: grid; gap: 8px; width: min(420px, calc(100vw - 32px)); pointer-events: none; }
.aviso { padding: 12px 16px; border-radius: 10px; background: var(--ink); color: var(--ground); font-size: 15px; box-shadow: 0 10px 28px rgba(0, 0, 0, 0.25); animation: aviso-entra 0.3s ease-out; transition: opacity 0.4s, transform 0.4s; }
.aviso.sai { opacity: 0; transform: translateY(8px); }
@keyframes aviso-entra { from { opacity: 0; transform: translateY(12px); } }
@media (prefers-reduced-motion: reduce) { .aviso { animation: none; } }

/* jogar e analisar */
.panel.destaque { border-color: var(--gold); background: color-mix(in srgb, var(--gold-soft) 45%, var(--surface)); }
.dica-analisar { margin: 0; font-size: 14px; color: var(--muted); }
.pgn-txt { width: 100%; margin-top: 12px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); font: 13px/1.45 var(--font-mono); resize: vertical; }
.moves button.lance { font: inherit; padding: 1px 4px; border: 0; border-radius: 4px; background: none; cursor: pointer; }
.moves button.lance:hover { background: var(--line); }
.moves button.lance.leve { background: color-mix(in srgb, var(--gold) 28%, transparent); }
.moves button.lance.grave { background: color-mix(in srgb, var(--bad) 30%, transparent); }
.moves button.lance.atual { outline: 2px solid var(--ink); }
.nav-lances { justify-content: flex-start; }
.nav-lances #status { flex: 1; text-align: center; font: 600 14px var(--font-mono); }