* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
:root {
  --bg: #11151f;
  --bg-2: #181e2c;
  --card: #1d2433;
  --card-2: #252e41;
  --line: #313b52;
  --text: #eef1f7;
  --muted: #9aa5bb;
  --accent: #e0a64b;
  --accent-2: #f3c77a;
  --good: #46c47e;
  --bad: #ef5a5a;
  --light: #f0d9b5;
  --dark: #b58863;
  --sel: rgba(255, 213, 79, .55);
  --last: rgba(255, 221, 87, .38);
  --radius: 14px;
  --board: min(94vw, 640px);
}
html { -webkit-text-size-adjust: 100%; }
body {
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 20% -10%, #273252 0%, transparent 60%), radial-gradient(900px 500px at 110% 10%, #3a2a1c 0%, transparent 55%), var(--bg);
  background-attachment: fixed;
  line-height: 1.45;
}
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
button:disabled { cursor: not-allowed; opacity: .5; }
[hidden] { display: none !important; }

/* Intestazione */
.top {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top));
  background: rgba(17, 21, 31, .85); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { font-size: 1.25rem; letter-spacing: .5px; display: flex; align-items: center; gap: 10px; margin-right: auto; }
.brand-icon { width: 30px; height: 30px; border-radius: 8px; background: var(--accent); display: grid; place-items: center; box-shadow: 0 4px 14px rgba(224, 166, 75, .35); }
.brand-icon i { width: 18px; height: 18px; border-radius: 50%; background: #1b1408; box-shadow: inset 0 0 0 3px #1b1408, inset 0 0 0 5px var(--accent-2); }
.top-btn { padding: 8px 12px; border-radius: 10px; background: var(--card); border: 1px solid var(--line); font-weight: 700; font-size: .95rem; }
.top-btn:hover { background: var(--card-2); }
.top-btn.icon { display: grid; place-items: center; width: 40px; height: 40px; padding: 0; font-size: 1.05rem; }
#btnHome { order: -1; }

main { max-width: 1180px; margin: 0 auto; padding: 18px 16px 40px; }
.screen { animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* Menu */
.hero { display: flex; align-items: center; gap: 22px; margin: 6px 0 22px; }
.hero h2 { font-size: clamp(1.4rem, 3.6vw, 2rem); margin-bottom: 6px; }
.hero p { color: var(--muted); max-width: 640px; }
.hero-board { flex: 0 0 auto; width: 104px; height: 104px; border-radius: 12px; overflow: hidden; display: grid; grid-template-columns: repeat(4, 1fr); box-shadow: 0 10px 30px rgba(0, 0, 0, .4); }
.hero-board > div { position: relative; background: var(--light); }
.hero-board > div.d { background: var(--dark); }
.hero-board .pz { position: absolute; inset: 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 16px; }
.card { background: linear-gradient(180deg, var(--card), var(--bg-2)); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; display: flex; flex-direction: column; gap: 10px; }
.card h3 { font-size: 1.15rem; display: flex; align-items: center; gap: 8px; }
.card p { color: var(--muted); }
.card-ico { font-size: 1.3rem; }
.card-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: auto; padding-top: 6px; }
.label { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; }
.muted { color: var(--muted); }
.small { font-size: .88rem; }
.levels { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.levels button { padding: 8px 2px; border-radius: 10px; background: var(--card-2); border: 1px solid var(--line); font-size: .78rem; line-height: 1.15; }
.levels button b { display: block; font-size: 1.05rem; color: var(--accent-2); }
.levels button.on { background: var(--accent); color: #1b1408; border-color: var(--accent); }
.levels button.on b { color: #1b1408; }
.seg { display: flex; background: var(--card-2); border: 1px solid var(--line); border-radius: 10px; padding: 3px; }
.seg button { flex: 1; padding: 7px 6px; border-radius: 8px; font-weight: 600; font-size: .92rem; }
.seg button.on { background: var(--text); color: var(--bg); }
.btn { padding: 10px 18px; border-radius: 10px; background: var(--card-2); border: 1px solid var(--line); font-weight: 700; }
.btn:hover:not(:disabled) { filter: brightness(1.15); }
.btn.primary { background: linear-gradient(180deg, var(--accent-2), var(--accent)); color: #1b1408; border-color: transparent; }
.btn.bad { background: transparent; border-color: var(--bad); color: #ffb4b4; }
.btn.small { padding: 7px 12px; font-size: .9rem; }
.check { display: flex; align-items: center; gap: 8px; color: var(--muted); cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }

/* Partita */
.game { display: grid; grid-template-columns: 1fr; gap: 14px; justify-items: center; }
.board-col { width: var(--board); display: flex; flex-direction: column; gap: 8px; }
.side { width: var(--board); display: flex; flex-direction: column; gap: 10px; }
@media (min-width: 940px) {
  :root { --board: min(calc(100vh - 170px), 640px, calc(100vw - 420px)); }
  .game { grid-template-columns: auto 330px; align-items: start; justify-content: center; }
  .side { width: 330px; position: sticky; top: 76px; }
}
@media (max-width: 939px) {
  :root { --board: min(calc(100vw - 20px), calc(100vh - 190px), 640px); }
  main { padding-left: 10px; padding-right: 10px; }
}
@media (max-width: 939px) and (max-height: 560px) { :root { --board: min(calc(100vw - 20px), 520px); } }

.pbar { display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 6px 10px; border-radius: 12px; background: var(--card); border: 1px solid var(--line); }
.pbar.turn { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.pbar .ico { position: relative; width: 28px; height: 28px; flex: 0 0 auto; }
.pbar .pname { min-width: 0; flex: 1; display: flex; flex-direction: column; line-height: 1.15; }
.pbar .pname b { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pbar .pname small { color: var(--muted); font-size: .8rem; }
.pbar .count { font-variant-numeric: tabular-nums; font-weight: 700; font-size: .9rem; color: var(--muted); text-align: right; line-height: 1.2; }
.pbar .count b { color: var(--text); }

.board-wrap { position: relative; isolation: isolate; width: var(--board); height: var(--board); border-radius: 6px; box-shadow: 0 18px 50px rgba(0, 0, 0, .5); touch-action: none; user-select: none; -webkit-user-select: none; }
.board { width: 100%; height: 100%; display: grid; grid-template-columns: repeat(8, 1fr); grid-template-rows: repeat(8, 1fr); border-radius: 6px; overflow: hidden; }
.sq { position: relative; background: var(--light); }
.sq.d { background: var(--dark); cursor: pointer; }
.sq.last::before, .sq.sel::before, .sq.hintsq::before, .sq.via::before { content: ""; position: absolute; inset: 0; background: var(--last); }
.sq.sel::before { background: var(--sel); }
.sq.via::before { background: rgba(255, 213, 79, .3); }
.sq.hintsq::before { background: rgba(70, 150, 255, .5); }
.sq .num { position: absolute; top: 3px; left: 4px; font-size: calc(var(--board) / 50); font-weight: 700; color: var(--light); opacity: .8; pointer-events: none; line-height: 1; z-index: 1; }
.sq .tg { position: absolute; z-index: 4; pointer-events: none; left: 50%; top: 50%; width: 30%; height: 30%; transform: translate(-50%, -50%); border-radius: 50%; background: rgba(20, 30, 20, .35); }
.sq .tg.cap { width: 40%; height: 40%; background: rgba(200, 30, 30, .55); box-shadow: 0 0 0 3px rgba(255, 255, 255, .35); }
.sq.over::after { content: ""; position: absolute; inset: 0; box-shadow: inset 0 0 0 calc(var(--board) / 150) rgba(255, 255, 255, .8); }

/* Pedine: dischi con anelli in rilievo; la dama è una pedina doppia con la corona */
.pieces { position: absolute; inset: 0; pointer-events: none; }
.pz { position: absolute; left: 0; top: 0; width: 12.5%; height: 12.5%; transition: transform .17s ease, opacity .25s ease; z-index: 2; }
.pz.muove { z-index: 8; }
.pz.trascina { transition: none; z-index: 20; filter: drop-shadow(0 10px 10px rgba(0, 0, 0, .4)); }
.pz.presa { opacity: 0; }
.pz.segnata .disco { box-shadow: 0 0 0 3px rgba(239, 90, 90, .95), 0 4px 8px rgba(0, 0, 0, .45); }
.pz.obbligo .disco { animation: obbligo .5s ease-in-out 3; }
@keyframes obbligo { 50% { box-shadow: 0 0 0 4px var(--accent-2), 0 0 16px 6px rgba(243, 199, 122, .8); } }
.disco {
  position: absolute; inset: 11%; border-radius: 50%;
  transition: transform .2s ease;
}
.pz.b .disco {
  background: radial-gradient(circle at 36% 30%, #fffdf7 0%, #f1ead8 38%, #d8cdb3 100%);
  box-shadow: 0 calc(var(--board) / 160) 0 #a8997a, 0 calc(var(--board) / 90) calc(var(--board) / 70) rgba(0, 0, 0, .45);
}
.pz.n .disco {
  background: radial-gradient(circle at 36% 30%, #6c6c74 0%, #34343a 40%, #141417 100%);
  box-shadow: 0 calc(var(--board) / 160) 0 #000, 0 calc(var(--board) / 90) calc(var(--board) / 70) rgba(0, 0, 0, .5);
}
.disco::before { content: ""; position: absolute; inset: 17%; border-radius: 50%; }
.disco::after { content: ""; position: absolute; inset: 32%; border-radius: 50%; }
.pz.b .disco::before { border: 2px solid rgba(120, 100, 60, .3); box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .55); }
.pz.b .disco::after { border: 2px solid rgba(120, 100, 60, .22); }
.pz.n .disco::before { border: 2px solid rgba(255, 255, 255, .12); box-shadow: inset 0 0 0 2px rgba(0, 0, 0, .35); }
.pz.n .disco::after { border: 2px solid rgba(255, 255, 255, .1); }
.disco.sotto { transform: translateY(5%); }
.pz:not(.dama) .disco.sotto { display: none; }
.pz.dama .disco.sopra { transform: translateY(-7%); }
.corona { position: absolute; inset: 30% 30% 34%; display: none; z-index: 1; }
.pz.dama .corona { display: block; transform: translateY(-14%); }
.corona path { stroke-width: 1.2; }
.pz.b .corona path { fill: #e0a64b; stroke: #8a5d16; }
.pz.n .corona path { fill: #f3c77a; stroke: #2a1c05; }

.board-banner { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); z-index: 30; max-width: 86%; padding: 12px 18px; border-radius: 12px; text-align: center; background: rgba(17, 21, 31, .92); border: 1px solid var(--line); font-weight: 600; box-shadow: 0 10px 30px rgba(0, 0, 0, .5); }

.game-status { padding: 12px 14px; border-radius: 12px; background: var(--card); border: 1px solid var(--line); font-weight: 700; display: flex; align-items: center; gap: 10px; min-height: 48px; }
.game-status.end { border-color: var(--accent); background: rgba(224, 166, 75, .12); }
.game-status .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--good); box-shadow: 0 0 0 3px rgba(70, 196, 126, .2); flex: 0 0 auto; }
.game-status small { display: block; font-weight: 500; color: var(--muted); font-size: .85rem; }
.spinner { width: 16px; height: 16px; border-radius: 50%; border: 2px solid var(--line); border-top-color: var(--accent); animation: spin .8s linear infinite; flex: 0 0 auto; }
@keyframes spin { to { transform: rotate(360deg); } }
.moves-box { background: var(--card); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.moves { max-height: 240px; min-height: 90px; overflow-y: auto; display: grid; align-content: start; grid-template-columns: 38px 1fr 1fr; font-variant-numeric: tabular-nums; padding: 4px 0; }
.moves .n { color: var(--muted); padding: 3px 8px; text-align: right; font-size: .9rem; }
.moves span.m { padding: 3px 8px; border-radius: 6px; font-weight: 600; }
.moves span.m.cur { background: var(--accent); color: #1b1408; }
.moves .empty-moves { grid-column: 1 / -1; color: var(--muted); padding: 10px 12px; font-size: .92rem; }
.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.actions .btn { padding: 10px 8px; font-size: .92rem; }
.actions .wide { grid-column: 1 / -1; }

/* Finestre */
.modal { position: fixed; inset: 0; z-index: 100; background: rgba(5, 8, 14, .66); display: grid; place-items: center; padding: 16px; animation: fade .15s ease; }
.modal-box { width: min(460px, 100%); max-height: calc(100vh - 32px); overflow-y: auto; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px; display: flex; flex-direction: column; gap: 12px; box-shadow: 0 30px 80px rgba(0, 0, 0, .6); }
.modal-box h2 { font-size: 1.3rem; }
.modal-box h3 { font-size: 1rem; margin-top: 4px; }
.modal-box ul { padding-left: 20px; display: flex; flex-direction: column; gap: 5px; }
.modal-box ol { padding-left: 22px; display: flex; flex-direction: column; gap: 3px; }
.modal-box .big { font-size: 2.6rem; text-align: center; line-height: 1; }
.modal-box .center { text-align: center; }
.modal-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; margin-top: 4px; }
.modal-actions.stack { flex-direction: column; }
.modal-actions.stack .btn { width: 100%; }
.opt-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.opt-row:last-child { border-bottom: 0; }
.themes { display: flex; gap: 8px; flex-wrap: wrap; }
.themes button { width: 44px; height: 44px; border-radius: 10px; overflow: hidden; display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; border: 2px solid transparent; padding: 0; }
.themes button.on { border-color: var(--accent); }
.switch { position: relative; width: 46px; height: 26px; flex: 0 0 auto; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch span { position: absolute; inset: 0; border-radius: 99px; background: var(--line); transition: background .2s; cursor: pointer; }
.switch span::after { content: ""; position: absolute; left: 3px; top: 3px; width: 20px; height: 20px; border-radius: 50%; background: #fff; transition: transform .2s; }
.switch input:checked + span { background: var(--accent); }
.switch input:checked + span::after { transform: translateX(20px); }
.switch input:focus-visible + span { outline: 2px solid var(--accent-2); outline-offset: 2px; }

.toasts { position: fixed; left: 50%; bottom: max(18px, env(safe-area-inset-bottom)); transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; align-items: center; width: min(92vw, 420px); pointer-events: none; }
.toast { padding: 10px 16px; border-radius: 12px; background: #f4f6fb; color: #11151f; font-weight: 600; box-shadow: 0 10px 30px rgba(0, 0, 0, .45); animation: fade .2s ease; text-align: center; }

@media (max-width: 520px) {
  .hero-board { width: 72px; height: 72px; }
  .hero { gap: 14px; }
  .pbar { min-height: 40px; padding: 4px 8px; }
  .levels button { font-size: .7rem; }
}
@media (prefers-reduced-motion: reduce) {
  .screen, .toast, .modal { animation: none; }
  .pz { transition: none; }
}