/* Pedagog web app — mobile-first layout around a chessground board. */
:root {
  --bg: #2b2b2b; --panel: #3a3a3a; --text: #eee; --muted: #aaa; --accent: #7fb069; --border: #555;
  --board: min(100vw - 1rem, 64vh);
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
header { display: flex; align-items: center; gap: 1rem; padding: .5rem .75rem; height: 2.6rem; box-sizing: border-box; overflow: hidden; }
header .logo { flex: none; width: 24px; height: 24px; }
header h1 { margin: 0; font-size: 1.25rem; letter-spacing: .08em; flex: none; }
/* One line, always: if the status wrapped, everything below it (the board!) would jump. */
.status { color: var(--muted); font-size: .9rem; flex: 1 1 0; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.status.thinking::after { content: " …"; }

main { display: grid; grid-template-columns: 1fr; gap: .75rem; padding: 0 .5rem 1rem; max-width: 72rem; margin: 0 auto; }
@media (min-width: 900px) {
  :root { --board: min(64vh, 60vw, 640px); }
  main { grid-template-columns: var(--board) minmax(18rem, 1fr); align-items: start; }
}

.board-column { position: relative; width: var(--board); margin: 0 auto; }
.board { width: var(--board); height: var(--board); touch-action: none; }   /* dragging must not scroll the page */
.board .cg-wrap { width: 100%; height: 100%; }
/* The bars above and below the board have a fixed height for the same reason. */
.player-bar { display: flex; align-items: center; gap: .5rem; padding: 0 .25rem; height: 2.4rem; overflow: hidden; }
.player-bar .name { font-weight: 600; white-space: nowrap; flex: none; }
.player-bar .clock { margin-left: auto; flex: none; font-variant-numeric: tabular-nums; font-size: 1.1rem; color: var(--muted); min-width: 3.2rem; text-align: right; }
.player-bar.active .clock { color: var(--text); }
.player-bar .name::before { content: "\00a0\00a0"; }   /* reserve the marker's width so the name does not jump */
.player-bar.active .name::before { content: "▸ "; color: var(--accent); }

/* Captured pieces reuse chessground's piece sprites: undo the board layout rules. */
.captured { display: inline-flex; flex-wrap: nowrap; align-items: center; gap: 0; position: static; width: auto; height: auto; min-width: 0; overflow: hidden; }
.captured piece { position: static; display: inline-block; flex: none; width: 20px; height: 20px; margin-right: -6px; pointer-events: none; }
.captured piece:last-of-type { margin-right: 0; }
.captured .diff { margin-left: .5rem; color: var(--muted); font-size: .85rem; white-space: nowrap; }

/* The promotion chooser also carries the cg-wrap class, because chessground's piece sprites are
   only defined under it; the rules below undo cg-wrap's board layout for this box. */
.promotion.cg-wrap { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: flex; gap: .4rem; padding: .5rem; width: auto; height: auto; background: var(--panel); border: 1px solid var(--border); border-radius: .5rem; box-shadow: 0 4px 16px rgba(0,0,0,.5); z-index: 5; }
.promotion button { width: 64px; height: 64px; padding: 0; background: #ddd; border: 0; border-radius: .4rem; position: relative; }
.promotion.cg-wrap piece { position: static; display: block; width: 100%; height: 100%; background-size: contain; background-repeat: no-repeat; background-position: center; pointer-events: none; }
.hidden { display: none !important; }

.side-column { display: flex; flex-direction: column; gap: .75rem; }
.setup { background: var(--panel); border-radius: .5rem; padding: .6rem .75rem; display: flex; flex-direction: column; gap: .5rem; }
.row { display: flex; flex-wrap: wrap; gap: .75rem; align-items: flex-end; }
.row label { display: flex; flex-direction: column; gap: .2rem; font-size: .85rem; color: var(--muted); flex: 1 1 10rem; }
.row label output { color: var(--text); font-weight: 600; margin-left: .25rem; }
.row .inline { display: flex; gap: .4rem; }
select, input[type=number], button, .button { font: inherit; padding: .45rem .6rem; border-radius: .4rem; border: 1px solid var(--border); background: #4a4a4a; color: var(--text); min-height: 2.5rem; }
input[type=number] { width: 6rem; }
input[type=range] { width: 100%; min-height: 2.5rem; accent-color: var(--accent); }
button, .button { cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; }
button:hover, .button:hover { background: #555; }
button.primary { background: var(--accent); color: #111; border-color: var(--accent); font-weight: 600; }
button:disabled, .button[aria-disabled="true"] { opacity: .5; pointer-events: none; }
.buttons { gap: .5rem; }

.start-fen { font-family: ui-monospace, monospace; font-size: .75rem; color: var(--muted); word-break: break-all; }

.moves-box { background: var(--panel); border-radius: .5rem; padding: .5rem .75rem; max-height: 14rem; overflow: auto; }
@media (min-width: 900px) { .moves-box { max-height: calc(var(--board) - 16rem); min-height: 8rem; } }
.moves { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: 2.5rem 1fr 1fr; gap: .1rem .5rem; font-variant-numeric: tabular-nums; }
.moves li { display: contents; }
.moves .num { color: var(--muted); }
.moves .san { cursor: pointer; padding: 0 .25rem; border-radius: .2rem; }
.moves .san:hover { background: #4a4a4a; }
.moves .san.current { background: var(--accent); color: #111; }
.opening { color: var(--muted); font-size: .85rem; margin-bottom: .3rem; min-height: 1.2em; }
.result { margin-top: .5rem; font-weight: 600; color: var(--accent); }
.about { color: var(--muted); font-size: .8rem; margin: 0; }