:root{
  --deep:#0B2E4A;
  --deep-2:#154266;
  --water:#1E6A9C;
  --water-2:#2A7DB4;
  --ink:#EEF5FB;
  --muted:#9CC0DA;
  --sand:#F4E3C1;
  --red:#E5484D;
  --gold:#FFC53D;
  --gold-dark:#C9940A;
  --paper:#FFFFFF;
  --paper-ink:#0B2E4A;
  --paper-muted:#5B7A93;
  --font:"Rubik", "Segoe UI", system-ui, sans-serif;
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{background:var(--deep)}
body{margin:0;color:var(--ink);font:16px/1.4 var(--font);padding-inline:12px;padding-block:8px 12px;-webkit-tap-highlight-color:transparent}
.app{max-width:1100px;margin-inline:auto;min-height:calc(100dvh - 20px);display:grid;grid-template-rows:auto auto 1fr;gap:8px;align-content:start}

.bar{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:44px}
.back{color:var(--muted);text-decoration:none;font-weight:600;font-size:15px;white-space:nowrap}
.back:hover{color:var(--ink)}
.title{margin:0;font-weight:800;font-size:clamp(1.25rem,3.6vw,1.9rem);white-space:nowrap}
.title span{color:var(--gold)}
.bar-actions{display:flex;gap:8px;align-items:center}
.icon-btn{width:42px;height:42px;border-radius:12px;border:0;background:var(--deep-2);color:var(--ink);display:grid;place-items:center;cursor:pointer;padding:0}
.icon-btn span{display:grid;place-items:center}
.icon-btn span[hidden]{display:none}
.icon-btn svg{width:22px;height:22px}
button{font:inherit;cursor:pointer}
.btn{border:0;border-radius:12px;background:var(--deep-2);color:var(--ink);font-weight:700;padding:10px 18px;box-shadow:0 4px 0 rgba(0,0,0,.35)}
.btn:active{transform:translateY(3px);box-shadow:0 1px 0 rgba(0,0,0,.35)}
.btn.small{padding:8px 14px;font-size:15px}
.btn.primary{background:var(--gold);color:#3B2A00;box-shadow:0 4px 0 var(--gold-dark)}
.btn.big{font-size:1.15rem;padding:12px 28px;width:100%}
.btn.light{background:#E3EDF5;color:var(--paper-ink)}
:focus-visible{outline:3px solid var(--gold);outline-offset:3px}

.turn{margin:0;text-align:center;font-weight:800;font-size:clamp(1rem,2.8vw,1.3rem);min-height:1.5em;text-wrap:balance}

.battle{display:grid;grid-template-columns:minmax(0,1fr) minmax(200px,300px);gap:14px;align-items:start}
.sea-wrap,.side{display:grid;gap:6px;align-content:start}
.sea-head{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-weight:700;font-size:14px;color:var(--muted)}
.sea-head span:first-child{color:var(--ink)}
.fleet-left{font-variant-numeric:tabular-nums}
.sea{display:grid;gap:3px;padding:6px;border-radius:14px;background:linear-gradient(160deg,#154C77,#0E3A5E);
  box-shadow:inset 0 0 0 3px rgba(255,255,255,.06)}
.sea.big{width:min(100%,520px);margin-inline:auto}
.sea.small{width:100%}
.sea.mid{width:min(100%,300px)}
.cell{aspect-ratio:1;border:0;border-radius:6px;background:var(--water);padding:0;position:relative;display:grid;place-items:center;color:#fff;font-weight:800;
  font-size:clamp(.8rem,2.6vw,1.2rem);line-height:1}
.sea.big .cell.open{cursor:crosshair}
.sea.big .cell.open:hover{background:var(--water-2)}
.cell.ship{background:#C8D3DD;box-shadow:inset 0 -3px 0 rgba(0,0,0,.18)}
.cell.miss{background:#16557F}
.cell.miss::after{content:"";width:28%;height:28%;border-radius:50%;background:rgba(255,255,255,.75)}
.cell.hit{background:var(--red)}
.cell.hit::after{content:"✕";color:#fff}
.cell.sunk{background:#7A1E22}
.cell.sunk::after{content:"✕";color:#FFB4B7}
.cell.shot{animation:boom .35s ease-out}
@keyframes boom{0%{transform:scale(.5)}60%{transform:scale(1.15)}100%{transform:scale(1)}}
.cell.last{outline:3px solid var(--gold);outline-offset:-3px}
.sea.small .cell,.sea.mid .cell{border-radius:4px;font-size:.7rem}
.legend{display:flex;flex-wrap:wrap;gap:8px 14px;font-size:12.5px;color:var(--muted);font-weight:600}
.legend span{display:inline-flex;align-items:center;gap:6px}
.lg{width:14px;height:14px;border-radius:3px;display:inline-block}
.lg.miss{background:#16557F;box-shadow:inset 0 0 0 4px #16557F, inset 0 0 0 7px rgba(255,255,255,.7)}
.lg.hit{background:var(--red)}
.lg.heat{background:linear-gradient(90deg,#3D8BFD,#FFC53D,#E5484D)}
.legend span[hidden]{display:none}

.banner{position:fixed;left:50%;top:40%;translate:-50% -50%;z-index:15;margin:0;background:rgba(11,46,74,.92);border-radius:999px;padding:10px 28px;
  font-weight:800;font-size:clamp(1.5rem,5vw,2.6rem);color:var(--gold);white-space:nowrap;pointer-events:none;animation:pop .45s ease-out;
  box-shadow:0 10px 30px rgba(0,0,0,.4)}
.banner[hidden]{display:none}
.banner.miss{color:#9CC0DA}
@keyframes pop{0%{scale:.4;opacity:0}60%{scale:1.1;opacity:1}100%{scale:1}}

.overlay{position:fixed;inset:0;z-index:20;display:grid;place-items:center;padding:16px;background:rgba(5,20,34,.8);overflow-y:auto}
.overlay[hidden]{display:none}
.sheet{width:100%;max-width:520px;background:var(--paper);color:var(--paper-ink);border-radius:22px;padding:20px 22px;display:grid;gap:14px;box-shadow:0 20px 50px rgba(0,0,0,.5)}
.sheet.center{text-align:center;justify-items:center;max-width:420px}
.sheet h2{margin:0;font-weight:800;font-size:1.9rem;text-align:center}
.lead{margin:0;color:var(--paper-muted);font-weight:600}
.help{margin:0;font-size:13px;color:var(--paper-muted);line-height:1.55}
.help b{color:var(--paper-ink)}
.av.big{width:74px;height:74px;border-radius:50%;display:grid;place-items:center;font-size:38px;background:#E3EDF5}
.end-title{margin:0;font-weight:800;font-size:1.7rem;text-wrap:balance}
.trophy{font-size:62px;line-height:1}
fieldset{border:0;margin:0;padding:0;display:grid;gap:8px}
legend{font-size:13px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--paper-muted);margin-bottom:6px;padding:0}
.toggle{display:flex;align-items:center;gap:8px;font-weight:700;cursor:pointer;white-space:nowrap}
.toggle input{width:22px;height:22px;accent-color:var(--paper-ink);flex:none}
.p-row{display:grid;grid-template-columns:40px 1fr auto;gap:8px;align-items:center}
.p-row .av{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;font-size:20px}
.p-row input[type="text"]{min-width:0;font:700 1.05rem var(--font);color:var(--paper-ink);padding:8px 12px;border-radius:12px;border:3px solid rgba(11,46,74,.12);background:#F4F8FB}
.p-row input[type="text"]:focus{border-color:var(--gold-dark);outline:none}
.p-row input:disabled{opacity:.55}
.seg{display:flex;border:3px solid rgba(11,46,74,.12);border-radius:12px;overflow:hidden}
.seg[hidden]{display:none}
.seg label{position:relative;cursor:pointer;flex:1}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg span{display:block;padding:7px 10px;font-size:14px;font-weight:700;color:var(--paper-muted);text-align:center}
.seg span small{display:block;font-size:11px;font-weight:600;opacity:.85}
.seg.wide span{font-size:1rem}
.seg label + label span{border-left:2px solid rgba(11,46,74,.1)}
.seg input:checked + span{background:var(--paper-ink);color:#fff}
.seg input:focus-visible + span{outline:3px solid var(--gold-dark);outline-offset:-3px}
.row{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}

@media (max-width:760px){
  .battle{grid-template-columns:minmax(0,1fr)}
  .side{grid-template-columns:minmax(0,160px) 1fr;align-items:start;column-gap:12px}
  .side .sea-head{grid-column:1 / -1}
  .legend{flex-direction:column;gap:6px}
}
@media (max-width:640px){
  .back-tx{display:none}
  .back{font-size:20px}
}
@media (prefers-reduced-motion:reduce){
  .cell.shot,.banner{animation:none}
}