:root {
    --bg: #0f1117;
    --panel: #171a23;
    --panel2: #1f232f;
    --border: #2a2f3d;
    --text: #e6e8ee;
    --muted: #8b92a5;
    --accent: #5b8cff;
    --accent2: #38d39f;
    --danger: #ff6b6b;
    --gold: #ffd166;
}
* { box-sizing: border-box; }
/* Always reserve the vertical scrollbar so centered content doesn't shift
   horizontally between short pages (Matches) and tall ones (My Bot). */
html { overflow-y: scroll; scrollbar-gutter: stable; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }

.topbar { background: var(--panel); border-bottom: 1px solid var(--border); }
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; padding: 12px 20px; }
.brand { font-weight: 800; font-size: 1.2rem; color: var(--text); letter-spacing: .5px; }
.brand span { color: var(--accent); }
.topbar nav { display: flex; align-items: center; gap: 18px; }
.topbar nav a { color: var(--muted); font-size: .95rem; }
.topbar nav a:hover { color: var(--text); text-decoration: none; }
/* The Register button is an <a> in the nav; keep its text white (the nav
   link-color rule above is more specific than .btn-sm and would gray it out). */
.topbar nav a.btn-sm, .topbar nav a.btn-sm:hover { color: #fff; }
.inline { display: inline; margin: 0; }
.linkbtn { background: none; border: none; color: var(--muted); cursor: pointer; font: inherit; padding: 0; }
.linkbtn:hover { color: var(--text); }

main.wrap { padding-top: 28px; padding-bottom: 40px; min-height: 60vh; }
footer.wrap { padding: 24px 20px; border-top: 1px solid var(--border); margin-top: 30px; font-size: .85rem; }
.muted { color: var(--muted); }

h1 { font-size: 1.7rem; margin: 0 0 6px; }
h2 { font-size: 1.2rem; margin: 28px 0 10px; }
.sub { color: var(--muted); margin: 0 0 22px; }

.flash { background: rgba(56,211,159,.12); border: 1px solid var(--accent2); color: #c9f7e6; padding: 10px 14px; border-radius: 8px; margin-bottom: 18px; }
.flash.error { background: rgba(255,107,107,.10); border-color: var(--danger); color: #ffd3d3; }
.flash ul { margin: 0; padding-left: 18px; }

table { width: 100%; border-collapse: collapse; background: var(--panel); border-radius: 10px; overflow: hidden; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: .82rem; text-transform: uppercase; letter-spacing: .4px; }
tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.rank { font-weight: 700; color: var(--muted); width: 40px; }
.rank.r1 { color: var(--gold); }
.rank.r2 { color: #cfd6e4; }
.rank.r3 { color: #e0a36b; }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 20px; margin-bottom: 18px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 760px) { .grid2 { grid-template-columns: 1fr; } }

.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: .78rem; font-weight: 600; }
.badge.ok { background: rgba(56,211,159,.15); color: var(--accent2); }
.badge.err { background: rgba(255,107,107,.15); color: var(--danger); }
.badge.pending { background: rgba(91,140,255,.15); color: var(--accent); }
.badge.draft { background: var(--panel2); color: var(--muted); }
.badge.win { background: rgba(56,211,159,.15); color: var(--accent2); }
.badge.loss { background: rgba(255,107,107,.15); color: var(--danger); }
.badge.draw { background: var(--panel2); color: var(--muted); }

label { display: block; font-size: .85rem; color: var(--muted); margin: 14px 0 6px; }
input[type=text], input[type=email], input[type=password] {
    width: 100%; padding: 10px 12px; background: var(--panel2); border: 1px solid var(--border);
    border-radius: 8px; color: var(--text); font-size: .95rem;
}
.btn {
    display: inline-block; background: var(--accent); color: #fff; border: none; padding: 10px 18px;
    border-radius: 8px; font-size: .95rem; font-weight: 600; cursor: pointer;
}
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn-sm { display: inline-block; background: var(--accent); color: #fff; padding: 5px 12px; border-radius: 7px; font-size: .85rem; }
.btn-sm:hover { text-decoration: none; filter: brightness(1.08); }
.btn.secondary { background: var(--panel2); border: 1px solid var(--border); color: var(--text); }

.authbox { max-width: 380px; margin: 30px auto; }
.authbox .card { padding: 26px; }
.authbox .alt { text-align: center; margin-top: 16px; color: var(--muted); font-size: .9rem; }

.errbox { background: #120e12; border: 1px solid var(--danger); color: #ffd3d3; padding: 12px 14px; border-radius: 8px; font-family: ui-monospace, Menlo, monospace; font-size: .85rem; white-space: pre-wrap; }
.kpi { display: flex; gap: 24px; flex-wrap: wrap; }
.kpi div { background: var(--panel2); border: 1px solid var(--border); border-radius: 10px; padding: 12px 18px; }
.kpi .v { font-size: 1.5rem; font-weight: 700; }
.kpi .l { color: var(--muted); font-size: .8rem; }

/* Replay board */
.board4d { display: grid; gap: 14px; }
.slice-row { display: flex; gap: 14px; flex-wrap: wrap; }
.slice { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 8px; }
.slice .lbl { font-size: .7rem; color: var(--muted); margin-bottom: 5px; text-align: center; }
.slice .cells { display: grid; gap: 2px; }
.cell { width: 26px; height: 26px; display: flex; align-items: center; justify-content: center;
    background: var(--panel2); border-radius: 4px; font-weight: 700; font-size: .9rem; }
.cell.X { color: #ff8585; }
.cell.O { color: #6fb6ff; }
.cell.last { outline: 2px solid var(--gold); }
.controls { display: flex; align-items: center; gap: 12px; margin: 16px 0; }
.controls input[type=range] { flex: 1; }
.movelog { font-family: ui-monospace, Menlo, monospace; font-size: .85rem; color: var(--muted); }
.CodeMirror { height: 520px; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; }