:root {
  --bg: #f6f4ee; --card: #ffffff; --ink: #1f2a24; --muted: #66726b; --line: #dcd8cb;
  --accent: #264d3a; --accent-ink: #ffffff; --warn: #8a5a00; --warn-bg: #fff3d6; --bad: #a12b2b; --good: #1f6b3d;
  --sq-l: #f0d9b5; --sq-d: #b58863; --sq-last: rgba(155, 199, 0, .41); --sq-sel: rgba(20, 85, 30, .5);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #151a17; --card: #1d2420; --ink: #e8ece9; --muted: #98a59d; --line: #2e3933;
    --accent: #5fae86; --accent-ink: #0d1a13; --warn: #f0c36a; --warn-bg: #3a2f14; --bad: #ff8a8a; --good: #7ad39b;
    --sq-l: #e2cfa8; --sq-d: #a47a58; --sq-last: rgba(155, 199, 0, .45);
  }
}
:root[data-theme="dark"] {
  --bg: #151a17; --card: #1d2420; --ink: #e8ece9; --muted: #98a59d; --line: #2e3933;
  --accent: #5fae86; --accent-ink: #0d1a13; --warn: #f0c36a; --warn-bg: #3a2f14; --bad: #ff8a8a; --good: #7ad39b;
  --sq-l: #e2cfa8; --sq-d: #a47a58; --sq-last: rgba(155, 199, 0, .45);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
.top { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--line); background: var(--card); }
.brand { font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--ink); }
main { max-width: 760px; margin: 0 auto; padding: 16px; }
.foot { max-width: 760px; margin: 0 auto; padding: 8px 16px 32px; font-size: .85rem; color: var(--muted); }
h1 { font-size: 1.4rem; margin: .2em 0 .6em; }
h2 { font-size: 1.15rem; margin: 0 0 .5em; }
h3 { font-size: 1rem; margin: 1em 0 .4em; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin: 0 0 16px; }
.muted { color: var(--muted); }
.small { font-size: .88rem; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.row.between { justify-content: space-between; }
.stack > * + * { margin-top: 12px; }
label { display: block; font-weight: 600; margin-bottom: 4px; }
input[type=text], input[type=password], input[type=number], select {
  width: 100%; padding: 10px 12px; font: inherit; color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px;
}
input:focus-visible, select:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.radio { display: flex; gap: 8px; align-items: flex-start; padding: 6px 0; font-weight: 400; cursor: pointer; }
.radio input { margin-top: 5px; }
button { font: inherit; font-weight: 600; padding: 10px 16px; border-radius: 8px; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink); cursor: pointer; min-height: 44px; }
button.ghost { background: transparent; color: var(--accent); }
button.danger { background: transparent; color: var(--bad); border-color: var(--bad); }
button.sm { padding: 4px 10px; min-height: 34px; font-size: .88rem; }
button:disabled { opacity: .55; cursor: default; }
.badge { display: inline-block; padding: 1px 10px; border-radius: 999px; font-size: .8rem; font-weight: 600; border: 1px solid var(--line); color: var(--muted); }
.badge.good { color: var(--good); border-color: var(--good); }
.badge.warn { color: var(--warn); border-color: var(--warn); }
.badge.bad { color: var(--bad); border-color: var(--bad); }
.notice { background: var(--warn-bg); color: var(--warn); border-radius: 10px; padding: 12px 14px; }
.keybox { font: 600 1.15rem/1.4 ui-monospace, Consolas, monospace; letter-spacing: .05em; word-break: break-all; padding: 14px; border: 2px dashed var(--accent); border-radius: 10px; text-align: center; user-select: all; }
.grid2 { display: grid; gap: 16px; }
@media (min-width: 640px) { .grid2 { grid-template-columns: 1fr 1fr; } }
.players { margin: .4em 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 6px; }
.players li { background: var(--bg); border: 1px solid var(--line); border-radius: 999px; padding: 1px 10px; font-size: .9rem; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: 6px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tablewrap { overflow-x: auto; }
#msg { position: fixed; left: 16px; right: 16px; bottom: 16px; max-width: 560px; margin: 0 auto; padding: 12px 16px; border-radius: 10px; background: var(--ink); color: var(--bg); font-weight: 600; box-shadow: 0 4px 16px rgba(0,0,0,.25); z-index: 10; }
#msg.bad { background: var(--bad); color: #fff; }

/* Schachbrett */
.board { display: grid; grid-template-columns: repeat(8, 1fr); width: min(100%, 560px); aspect-ratio: 1; margin: 0 auto; border-radius: 6px; overflow: hidden; box-shadow: 0 2px 10px rgba(0, 0, 0, .35); touch-action: manipulation; user-select: none; -webkit-user-select: none; }
.board.busy { opacity: .6; pointer-events: none; }
.sq { position: relative; display: block; padding: 0; min-height: 0; border: 0; border-radius: 0; font-weight: 400; cursor: pointer; color: inherit; }
.sq.light { background-color: var(--sq-l); }
.sq.dark { background-color: var(--sq-d); }
.sq.last { box-shadow: inset 0 0 0 100px var(--sq-last); }
.sq.sel { box-shadow: inset 0 0 0 100px var(--sq-sel); }
.sq.tgt.mv { background-image: radial-gradient(circle, rgba(20, 85, 30, .5) 0, rgba(20, 85, 30, .5) 18%, transparent 20%); }
.sq.tgt.cap { background-image: radial-gradient(circle, transparent 0, transparent 70%, rgba(20, 85, 30, .45) 72%); }
.sq.chk { background-image: radial-gradient(circle, #e53935 0, #e53935 28%, rgba(229, 57, 53, 0) 72%); }
.sq:focus-visible { outline: 3px solid var(--accent); outline-offset: -3px; z-index: 1; }
.sq[data-file]::before { content: attr(data-file); position: absolute; right: 4px; bottom: 1px; font-size: clamp(.55rem, 2vw, .75rem); font-weight: 700; line-height: 1; pointer-events: none; }
.sq[data-rank]::after { content: attr(data-rank); position: absolute; left: 4px; top: 2px; font-size: clamp(.55rem, 2vw, .75rem); font-weight: 700; line-height: 1; pointer-events: none; }
.sq.light[data-file]::before, .sq.light[data-rank]::after { color: var(--sq-d); }
.sq.dark[data-file]::before, .sq.dark[data-rank]::after { color: var(--sq-l); }
.pc { display: block; width: 100%; height: 100%; background-repeat: no-repeat; background-position: center; background-size: 92%; pointer-events: none; }
.pc.wK { background-image: url(pieces/wK.svg); } .pc.wQ { background-image: url(pieces/wQ.svg); } .pc.wR { background-image: url(pieces/wR.svg); }
.pc.wB { background-image: url(pieces/wB.svg); } .pc.wN { background-image: url(pieces/wN.svg); } .pc.wP { background-image: url(pieces/wP.svg); }
.pc.bK { background-image: url(pieces/bK.svg); } .pc.bQ { background-image: url(pieces/bQ.svg); } .pc.bR { background-image: url(pieces/bR.svg); }
.pc.bB { background-image: url(pieces/bB.svg); } .pc.bN { background-image: url(pieces/bN.svg); } .pc.bP { background-image: url(pieces/bP.svg); }
button.promo { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px 4px 4px; }
button.promo .pc { width: 44px; height: 44px; background-color: var(--sq-l); border-radius: 6px; background-size: 100%; }
.pname { display: flex; align-items: center; gap: 8px; width: min(100%, 560px); margin: 0 auto; font-weight: 600; }
.pname .dot { width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--ink); flex: none; }
.pname .dot.w { background: #fff; } .pname .dot.b { background: #111; }
.gamerow { display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.gamerow:last-child { border-bottom: 0; }
.gamerow:hover span:first-child { text-decoration: underline; }
.moves td { border-bottom: 0; padding: 2px 10px 2px 0; font-variant-numeric: tabular-nums; }
.moves { width: auto; }
.gamewrap { width: 100%; max-width: 560px; margin: 0 auto; }
.gamewrap .card { margin-bottom: 0; }

.sq.mov { cursor: grab; }
.board.can-drag .sq { touch-action: none; }
.sq.dragging .pc { opacity: .3; }
.pc.ghost { position: fixed; left: 0; top: 0; z-index: 60; pointer-events: none; will-change: transform; background-size: 100%; filter: drop-shadow(0 6px 8px rgba(0, 0, 0, .45)); }