:root {
  --bg: #14130f;
  --bg2: #1a1915;
  --panel: #242320;
  --panel-2: #2d2b27;
  --panel-3: #35322d;
  --text: #ecebe8;
  --muted: #9d978e;
  --faint: #6f6a62;
  --accent: #7fa650;
  --accent-ink: #11210a;
  --accent-2: #5b9bd0;
  --warn: #e0963c;
  --bad: #d75f5f;
  --good: #7fa650;
  --border: #37332d;
  --border-soft: #2c2a25;
  --board: 560px;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(0,0,0,.25), 0 6px 20px rgba(0,0,0,.18);
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background:
    radial-gradient(1200px 600px at 100% -10%, rgba(91,155,208,.06), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(127,166,80,.05), transparent 55%),
    var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.muted { color: var(--muted); }
.small { font-size: 12px; }
h1 { font-size: 22px; margin: 0; letter-spacing: -.01em; }

button { font: inherit; cursor: pointer; border-radius: 9px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); padding: 7px 13px; transition: background .12s, border-color .12s, filter .12s; }
button:hover { background: var(--panel-3); }
button:active { transform: translateY(1px); }
button:disabled { opacity: .45; cursor: default; }
button.ghost { background: transparent; }
button.ghost:hover { background: var(--panel-2); }
button.primary { background: var(--accent); color: var(--accent-ink); border: none; font-weight: 700; width: 100%; padding: 11px; letter-spacing: .01em; }
button.primary:hover { filter: brightness(1.07); background: var(--accent); }
input, textarea { font: inherit; color: var(--text); background: var(--bg2); border: 1px solid var(--border); border-radius: 9px; padding: 8px 11px; }
input:focus, textarea:focus { outline: none; border-color: var(--accent-2); box-shadow: 0 0 0 3px rgba(91,155,208,.18); }

/* ---- login ---- */
.login-body { display: grid; place-items: center; min-height: 100vh; }
.login-card { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 34px; width: min(92vw, 370px); box-shadow: var(--shadow); }
.login-card h1 { margin: 0 0 4px; font-size: 22px; }
.login-card form { display: grid; gap: 14px; margin-top: 18px; }
.login-card label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
.login-card button { background: var(--accent); color: var(--accent-ink); border: none; font-weight: 700; padding: 10px 14px; }
.error { color: #e06b6b; font-size: 13px; margin: 0; }

/* ---- topbar ---- */
.topbar { display: flex; align-items: center; gap: 18px; padding: 0 22px; height: 56px; background: rgba(26,25,21,.85); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; }
.brand { font-weight: 700; letter-spacing: -.01em; }
.tabs { display: flex; gap: 2px; }
.tab { color: var(--muted); text-decoration: none; padding: 7px 14px; border-radius: 9px; font-weight: 500; font-size: 14.5px; transition: background .12s, color .12s; }
.tab:hover { background: var(--panel-2); color: var(--text); }
.tab.active { background: var(--accent-2); color: #fff; box-shadow: 0 2px 10px rgba(91,155,208,.25); }
.spacer { flex: 1; }
.who { font-size: 13px; }

/* ---- layout ---- */
main { padding: 24px; max-width: 1200px; margin: 0 auto; }
.view.hidden { display: none; }
.view-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; gap: 12px; flex-wrap: wrap; }
.view-head-right { display: flex; gap: 8px; }
.user-input { width: 150px; }
.filter { font: inherit; color: var(--text); background: var(--bg2); border: 1px solid var(--border); border-radius: 9px; padding: 7px 10px; cursor: pointer; }
.filter:focus { outline: none; border-color: var(--accent-2); box-shadow: 0 0 0 3px rgba(91,155,208,.18); }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin-bottom: 16px; box-shadow: var(--shadow); }
.card-title { font-weight: 650; margin-bottom: 12px; display: flex; align-items: baseline; gap: 8px; font-size: 14px; letter-spacing: .01em; }
.panel-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.panel-row label { font-size: 13px; color: var(--muted); display: inline-flex; gap: 6px; align-items: center; }
.panel-row input[type=number] { width: 58px; }
.field { display: grid; gap: 6px; margin: 10px 0; font-size: 13px; color: var(--muted); }
.field input, .field textarea { width: 100%; }
.toggle { cursor: pointer; }

/* ---- charts (fixed-height boxes prevent infinite growth) ---- */
.chart-box { position: relative; height: 240px; }
.chart-box-sm { height: 150px; }
.chart-box canvas { position: absolute !important; inset: 0; width: 100% !important; height: 100% !important; }
.chart-empty { position: absolute; inset: 0; display: grid; place-items: center; color: var(--faint); font-size: 12.5px; }

/* ---- dashboard ---- */
.review-banner { background: linear-gradient(180deg, rgba(91,155,208,.12), rgba(91,155,208,.05)); border: 1px solid rgba(91,155,208,.4); border-radius: 10px; padding: 10px 14px; margin-bottom: 16px; font-size: 13px; display: flex; align-items: center; gap: 8px; }
.review-banner::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 0 0 rgba(91,155,208,.6); animation: pulse 1.6s infinite; }
@keyframes pulse { 0%{box-shadow:0 0 0 0 rgba(91,155,208,.5)} 70%{box-shadow:0 0 0 8px rgba(91,155,208,0)} 100%{box-shadow:0 0 0 0 rgba(91,155,208,0)} }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 18px; }
.stat { background: linear-gradient(180deg, var(--panel), var(--bg2)); border: 1px solid var(--border); border-radius: var(--radius); padding: 15px 16px; box-shadow: var(--shadow); }
.stat-value { font-size: 27px; font-weight: 750; letter-spacing: -.02em; line-height: 1.1; }
.stat-label { color: var(--muted); font-size: 11px; margin-top: 4px; text-transform: uppercase; letter-spacing: .06em; }
.stat-sub { color: var(--faint); font-size: 11.5px; margin-top: 5px; }
.charts-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.games-table { display: grid; gap: 1px; }
.game-row { display: grid; grid-template-columns: 22px 1fr auto auto auto; gap: 12px; align-items: center; padding: 9px 10px; border-radius: 9px; cursor: pointer; font-size: 13.5px; transition: background .1s; }
.game-row:hover { background: var(--panel-2); }
.g-site { font-size: 15px; text-align: center; color: var(--muted); }
.g-players { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.g-res { font-weight: 700; font-variant-numeric: tabular-nums; }
.acc-badge { background: var(--panel-3); border-radius: 6px; padding: 2px 8px; font-size: 11px; color: var(--accent); white-space: nowrap; font-weight: 600; }

/* ---- analyze / play ---- */
/* Default (used by Play): board + one side panel. */
.analyze-layout { display: grid; grid-template-columns: var(--board) minmax(300px, 380px); gap: 20px; align-items: start; justify-content: center; }
/* Analyze: three balanced columns so content fits with minimal scrolling. */
#view-analyze .analyze-layout { grid-template-columns: var(--board) minmax(290px, 360px) minmax(280px, 330px); gap: 18px; }
.col-board, .col-mid, .col-side { display: grid; gap: 14px; align-content: start; min-width: 0; }
.col-board { gap: 12px; }
.col-mid .card, .col-side .card { margin: 0; }
@media (max-width: 1240px) {
  #view-analyze .analyze-layout { grid-template-columns: var(--board) minmax(300px, 1fr); }
}
.board-col { display: grid; gap: 12px; }
.board-wrap { display: flex; gap: 8px; }
.cg-wrap { width: var(--board); height: var(--board); position: relative; border-radius: 6px; overflow: hidden; box-shadow: var(--shadow); }
#play-board { width: var(--board); height: var(--board); border-radius: 6px; overflow: hidden; box-shadow: var(--shadow); }
.evalbar { position: relative; width: 22px; height: var(--board); background: #14140f; border-radius: 5px; overflow: hidden; flex: none; border: 1px solid var(--border); }
.evalbar-fill { position: absolute; bottom: 0; left: 0; right: 0; height: 50%; background: #eeeee8; transition: height .3s ease; }
.evalbar-text { position: absolute; left: 0; right: 0; bottom: 3px; text-align: center; font-size: 9px; color: #888; font-weight: 700; mix-blend-mode: difference; }
.board-controls { display: flex; gap: 6px; flex-wrap: wrap; }
.board-controls button { min-width: 40px; }
.evalgraph-card { margin: 0; }
.side-col { display: grid; gap: 14px; }
.side-col .card { margin: 0; }
.status { font-size: 11px; color: var(--faint); margin-left: auto; }
.engine-head { display: flex; align-items: baseline; gap: 10px; margin: 10px 0 8px; }
.eval-main { font-size: 26px; font-weight: 750; font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.lines { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.lines li { display: grid; grid-template-columns: 54px 1fr; gap: 8px; padding: 7px 9px; background: var(--panel-2); border-radius: 8px; cursor: pointer; font-size: 13px; transition: outline .1s; }
.lines li:hover { outline: 1.5px solid var(--accent-2); }
.line-score { font-weight: 700; color: var(--accent); font-variant-numeric: tabular-nums; }
.line-moves { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--muted); }

.review-counts { margin-bottom: 10px; }
.rev-acc { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 12px; }
.rev-acc-col { background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 10px; text-align: center; }
.rev-acc-num { font-size: 26px; font-weight: 800; letter-spacing: -.02em; }
.rev-acc-lbl { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; margin-top: 2px; }
.rev-table { display: grid; gap: 1px; }
.rev-trow { display: grid; grid-template-columns: 28px 1fr 28px; align-items: center; gap: 8px; padding: 5px 6px; border-radius: 6px; font-size: 13px; }
.rev-trow:hover { background: var(--panel-2); }
.rev-w, .rev-b { text-align: center; font-variant-numeric: tabular-nums; font-weight: 700; color: var(--muted); }
.rev-cat { display: flex; align-items: center; gap: 8px; }
.rev-ic { width: 20px; height: 20px; border-radius: 5px; display: inline-grid; place-items: center; font-size: 11px; font-weight: 800; color: #11210a; flex: none; }
.km-title { margin: 8px 0 6px; }
.key-moments { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.key-moments li { display: flex; align-items: center; gap: 8px; padding: 5px 7px; border-radius: 6px; cursor: pointer; font-size: 13px; font-variant-numeric: tabular-nums; }
.key-moments li[data-ply]:hover { background: var(--panel-2); }
.km-dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.mistake-btn { color: var(--warn); border-color: var(--warn); }
.mistake-btn:hover { background: rgba(224,150,60,.12); }
.return-btn { color: var(--accent-2); border-color: var(--accent-2); }
.return-btn:hover { background: rgba(91,155,208,.14); }

.move-badge { font-size: 11px; font-weight: 700; color: #fff; padding: 2px 9px; border-radius: 6px; }
.explain-text { font-size: 13.5px; line-height: 1.55; color: var(--text); }
.opening-name { font-size: 14.5px; margin-bottom: 5px; }

.movelist { position: relative; max-height: 260px; overflow-y: auto; font-variant-numeric: tabular-nums; font-size: 13.5px; }
.movelist:empty::after { content: "Load a game or play moves to see the move list."; color: var(--faint); font-size: 12.5px; }
.move-row { display: flex; align-items: center; gap: 4px; padding: 1px 0; }
.move-num { color: var(--faint); width: 30px; flex: none; text-align: right; padding-right: 4px; }
.ply { padding: 2px 7px; border-radius: 5px; cursor: pointer; display: inline-flex; align-items: center; gap: 5px; }
.ply:hover { background: var(--panel-2); }
.ply.active { background: var(--accent-2); color: #fff; }
.ply.disabled { color: var(--faint); cursor: default; }
.qdot { width: 7px; height: 7px; border-radius: 50%; display: inline-block; }
.qglyph { display: inline-grid; place-items: center; min-width: 15px; height: 15px; padding: 0 2px; border-radius: 4px; font-size: 9px; font-weight: 800; color: #11210a; line-height: 1; }

/* ---- Chess.com-style green board + coordinates ---- */
.cg-wrap cg-board, #play-board cg-board, .trainer-board cg-board {
  background-color: #ebecd0;
  /* 2x2 SVG tile: two green squares on the diagonal → exact checkerboard when tiled 4x4. */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='2' height='2'%3E%3Crect width='1' height='1' fill='%23779556'/%3E%3Crect x='1' y='1' width='1' height='1' fill='%23779556'/%3E%3C/svg%3E");
  background-size: 25% 25%;
  background-position: 0 0;
  background-repeat: repeat;
}
.cg-wrap coords coord { font-size: 9px; font-weight: 700; }
.cg-wrap coords.files coord { color: rgba(0,0,0,.42); }
.cg-wrap coords.ranks coord { color: rgba(0,0,0,.42); }

/* ---- openings ---- */
.openings-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 16px; }
.op-table, .op-study { display: grid; gap: 2px; }
.op-row { display: grid; grid-template-columns: 1fr auto 86px auto; gap: 12px; align-items: center; padding: 8px 10px; border-radius: 8px; cursor: pointer; font-size: 13.5px; transition: background .1s; }
.op-study .op-row { grid-template-columns: 1fr auto; }
.op-row:hover { background: var(--panel-2); }
.op-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.op-count { font-variant-numeric: tabular-nums; }
.op-rate { font-weight: 700; font-variant-numeric: tabular-nums; text-align: right; }
.op-rate.warn { color: var(--bad); }
.wdl { display: inline-flex; width: 86px; height: 9px; border-radius: 5px; overflow: hidden; background: var(--panel-3); }
.wdl i { display: block; height: 100%; }
.op-library { display: grid; gap: 2px; }
.op-lib { display: grid; grid-template-columns: 1fr auto auto; gap: 10px; align-items: center; padding: 8px 10px; border-radius: 8px; cursor: pointer; font-size: 13.5px; transition: background .1s; }
.op-lib:hover { background: var(--panel-2); }
.op-lib:hover .op-go { color: var(--accent-2); }
.op-eco { font-size: 11px; font-variant-numeric: tabular-nums; }
.op-go { color: var(--faint); font-size: 12px; }
.chip { font-size: 11.5px; font-weight: 600; color: var(--accent-2); background: var(--panel-2); border: 1px solid var(--border); border-radius: 20px; padding: 3px 10px; }

.trainer-wrap { display: grid; grid-template-columns: 380px 1fr; gap: 24px; align-items: start; }
.trainer-board { width: 380px; height: 380px; border-radius: 6px; overflow: hidden; box-shadow: var(--shadow); }
.trainer-board.shake { animation: shake .4s; }
@keyframes shake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-6px)} 75%{transform:translateX(6px)} }
.progress-bar { height: 6px; background: var(--panel-2); border-radius: 4px; margin-top: 8px; overflow: hidden; }
.progress-fill { height: 100%; width: 0; background: var(--accent); transition: width .25s ease; }
.trainer-side { display: grid; gap: 12px; align-content: start; }
.trainer-info { font-size: 13.5px; line-height: 1.5; color: var(--text); }
.trainer-plans { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.trainer-plans li { font-size: 12.5px; color: var(--muted); padding-left: 16px; position: relative; }
.trainer-plans li::before { content: "›"; position: absolute; left: 2px; color: var(--accent); }
.trainer-moves { min-height: 24px; font-size: 14px; font-variant-numeric: tabular-nums; line-height: 1.8; }
.trainer-moves .tm-num { color: var(--faint); margin: 0 3px 0 8px; }
.trainer-moves .tm-num:first-child { margin-left: 0; }
.trainer-moves .tm { padding: 1px 4px; }
.trainer-moves .done { color: var(--accent); font-weight: 650; }
.trainer-moves .wrong { color: var(--bad); }

/* ---- play ---- */
.seg { padding: 6px 12px; font-size: 13px; }
.seg.active { background: var(--accent-2); color: #fff; border-color: transparent; }
#elo-slider { width: 100%; accent-color: var(--accent-2); margin-top: 6px; }
#elo-label { color: var(--accent-2); font-size: 15px; }
.play-status { font-size: 13px; min-height: 18px; color: var(--muted); }
.play-result { font-size: 15.5px; margin-bottom: 8px; font-weight: 600; }
.player-tag { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; padding: 2px; color: var(--text); }
.player-tag .pt-name { }
.play-opt { display: flex; align-items: center; gap: 8px; margin: 9px 0; font-size: 13.5px; color: var(--text); cursor: pointer; }
.play-opt input { width: auto; }

/* Tablet / small desktop: collapse multi-column views to one column. */
@media (max-width: 980px) {
  :root { --board: min(94vw, 560px); }
  .analyze-layout, #view-analyze .analyze-layout, .openings-grid, .trainer-wrap { grid-template-columns: 1fr; }
  .col-board, .col-mid, .col-side, .board-col, .side-col { max-width: 640px; width: 100%; margin: 0 auto; }
  #play-board { width: var(--board); height: var(--board); }
}

/* Phone: everything stacks, nothing overflows horizontally. */
@media (max-width: 640px) {
  :root { --board: min(96vw, 520px); }
  main { padding: 14px 12px; }
  .charts-grid { grid-template-columns: 1fr; }
  .topbar { height: auto; flex-wrap: wrap; gap: 8px 10px; padding: 8px 12px; position: static; }
  .brand { width: 100%; }
  .tabs { order: 3; width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .tab { padding: 7px 11px; font-size: 14px; white-space: nowrap; }
  .who, #logout { margin-left: auto; }
  .view-head { align-items: flex-start; }
  .view-head-right { flex-wrap: wrap; width: 100%; }
  .user-input { width: calc(50% - 4px); }
  .filter { flex: 1 1 42%; }
  .stat-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-value { font-size: 22px; }
  .evalbar { width: 16px; }
  .board-controls { gap: 5px; }
  .board-controls button { min-width: 36px; padding: 7px 8px; }
  .trainer-board { width: 96vw; height: 96vw; max-width: 460px; max-height: 460px; }
  .op-row, .op-lib { grid-template-columns: 1fr auto; }
  .op-row .wdl, .op-row .op-count { display: none; }
  .game-row { grid-template-columns: 18px 1fr auto; row-gap: 2px; }
  .game-row .g-meta, .game-row .acc-badge { grid-column: 2 / -1; }
}