:root{
  --t90:#ff3b3b; --t70:#ff8a2b; --t50:#ffd23b; --t30:#3bd16f; --t10:#3b9bff;
  --bg:#0b0d14; --bg2:#121521; --panel:#161a28; --panel2:#1d2333;
  --line:#2a3146; --ink:#e8ecf6; --dim:#8a93ad; --dimmer:#5c647d;
  --accent:#ff2e88;
}
*{box-sizing:border-box}
html,body{margin:0;background:
   radial-gradient(1200px 600px at 70% -10%, #1a1030 0%, transparent 60%),
   radial-gradient(900px 500px at -10% 20%, #06223a 0%, transparent 55%),
   var(--bg);
  color:var(--ink);
  font-family:"DM Sans",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  -webkit-text-size-adjust:100%;}
.wrap{max-width:1080px;margin:0 auto;padding:28px 20px 80px}

/* header */
header{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;
  border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:22px}
.logo{font-family:"Arial Narrow","Oswald",sans-serif;font-weight:800;
  letter-spacing:.06em;font-size:34px;line-height:1;text-transform:uppercase;
  background:linear-gradient(90deg,var(--t90),var(--t70),var(--t50),var(--t30),var(--t10));
  -webkit-background-clip:text;background-clip:text;color:transparent;}
.logo .arrows{font-size:22px;-webkit-text-fill-color:var(--ink);margin-left:8px;letter-spacing:.1em}
.tag{color:var(--dim);font-size:14px}

/* controls */
.controls{display:grid;grid-template-columns:1fr;gap:18px;margin-bottom:22px}
@media(min-width:720px){.controls{grid-template-columns:auto 1fr;align-items:start}}
.ctl-label{font-size:12px;text-transform:uppercase;letter-spacing:.12em;
  color:var(--dim);margin-bottom:8px}

/* difficulty grid: auto-fitting columns so it never overflows the viewport */
.diffgrid{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:6px;max-width:460px}
.diffbtn{aspect-ratio:1;border:1px solid var(--line);background:var(--panel);
  color:var(--ink);border-radius:8px;font-weight:700;font-size:14px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;transition:.12s;
  font-variant-numeric:tabular-nums;padding:0;min-width:0}
.diffbtn:hover{border-color:var(--accent);transform:translateY(-1px)}
.diffbtn.active{background:var(--accent);border-color:var(--accent);color:#fff;
  box-shadow:0 0 0 3px rgba(255,46,136,.25)}
.diffbtn:disabled{opacity:.28;cursor:not-allowed}

.cats{display:flex;flex-wrap:wrap;gap:8px}
.catbtn{border:1px solid var(--line);background:var(--panel);color:var(--ink);
  padding:9px 14px;border-radius:999px;cursor:pointer;font-size:13px;font-weight:600;
  transition:.12s;white-space:nowrap;max-width:100%}
.catbtn:hover{border-color:var(--accent)}
.catbtn.active{background:linear-gradient(90deg,#ff2e88,#ff6a3d);border-color:transparent;color:#fff}
.catdesc{margin-top:10px;color:var(--dim);font-size:13.5px;min-height:1.2em;max-width:560px;line-height:1.5}

/* minimum-instance threshold (speed categories only; dormant unless re-added) */
.threshold{display:none;align-items:center;gap:12px;margin:12px 0 2px;
  background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:11px 15px;flex-wrap:wrap}
.threshold.show{display:flex}
.threshold label{font-size:13px;color:var(--ink);font-weight:600;white-space:nowrap}
.threshold input[type=range]{flex:1;min-width:140px;accent-color:var(--accent)}
.threshold .tval{font-family:"DM Mono",ui-monospace,monospace;font-size:14px;
  color:var(--accent);font-weight:700;min-width:88px;text-align:right;font-variant-numeric:tabular-nums}
.threshold .thint{flex-basis:100%;color:var(--dim);font-size:12px;line-height:1.45}

/* tier bands */
.list{display:flex;flex-direction:column;gap:8px}
.band{display:grid;grid-template-columns:54px minmax(0,1fr);align-items:stretch;
  background:var(--panel);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.band-label{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;
  font-family:"DM Mono",ui-monospace,monospace;font-weight:700;font-size:13px;
  color:#0b0d14;padding:8px 0;line-height:1.15;font-variant-numeric:tabular-nums}
.band-label span.lbltext{position:sticky;top:8px}
.band-label small{font-size:9px;font-weight:600;opacity:.7}
.band-tiles{display:flex;flex-wrap:wrap;gap:6px;padding:8px 10px;min-height:46px;
  align-items:flex-start;min-width:0}
.band-empty{color:var(--dimmer);font-size:12px;font-style:italic;padding-left:2px}
/* tiles size to their content, never stretch; border fully visible */
.tile{display:inline-flex;flex-direction:column;gap:1px;background:var(--bg2);
  border:1.5px solid var(--line);border-radius:7px;padding:6px 11px;cursor:pointer;
  transition:.1s;width:auto;max-width:100%;flex:0 0 auto}
.tile:hover{background:var(--panel2);transform:translateY(-2px)}
.tile .t-title{font-weight:600;font-size:12.5px;white-space:nowrap;overflow:hidden;
  text-overflow:ellipsis;max-width:170px}
.tile .t-val{font-family:"DM Mono",ui-monospace,monospace;font-size:11px;color:var(--dim);
  font-variant-numeric:tabular-nums}
.tile.na{opacity:.5}

.empty{color:var(--dim);text-align:center;padding:60px 20px;font-size:15px}

/* modal */
.modal-bg{position:fixed;inset:0;background:rgba(4,6,12,.72);backdrop-filter:blur(3px);
  display:none;align-items:center;justify-content:center;padding:20px;z-index:50}
.modal-bg.open{display:flex}
.modal{background:var(--panel2);border:1px solid var(--line);border-radius:16px;
  max-width:520px;width:100%;max-height:86vh;overflow:auto;
  box-shadow:0 30px 80px rgba(0,0,0,.6)}
.modal-head{padding:20px 22px;border-bottom:1px solid var(--line);position:sticky;top:0;
  background:var(--panel2);display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.modal-head h2{margin:0 0 3px;font-size:20px}
.modal-head .sub{color:var(--dim);font-size:13px}
.x{background:none;border:1px solid var(--line);color:var(--ink);border-radius:8px;
  width:34px;height:34px;cursor:pointer;font-size:18px;flex:none}
.x:hover{border-color:var(--accent)}
.stats{padding:8px 22px 22px}
.stat{display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:11px 0;border-bottom:1px solid rgba(255,255,255,.05)}
.stat:last-child{border-bottom:none}
.stat .k{color:var(--dim);font-size:13px}
.stat .v{font-family:"DM Mono",monospace;font-weight:600;font-size:14px;font-variant-numeric:tabular-nums}
.pctbar{margin-top:14px}
.pctbar .barlabel{display:flex;justify-content:space-between;font-size:12px;color:var(--dim);margin:10px 0 4px}
.bar{height:8px;border-radius:99px;background:var(--panel);overflow:hidden}
.bar i{display:block;height:100%;border-radius:99px}

/* ---- mobile ---- */
@media(max-width:640px){
  .wrap{padding:18px 13px 64px}
  header{flex-direction:column;align-items:flex-start;gap:6px;padding-bottom:14px}
  .logo{font-size:26px}
  .logo .arrows{font-size:17px}
  .tag{font-size:12.5px;line-height:1.4}
  /* difficulty grid wraps to a fitting number of columns, never overflows */
  .diffgrid{grid-template-columns:repeat(auto-fill,minmax(44px,1fr));max-width:none;gap:7px}
  .diffbtn{font-size:15px;border-radius:9px}
  .catbtn{padding:11px 15px;font-size:14px}
  .catdesc{font-size:13px;max-width:none}
  .band{grid-template-columns:40px minmax(0,1fr)}
  .band-label{font-size:12px;padding:8px 0}
  .band-label small{display:none}
  .band-tiles{padding:7px 8px;gap:6px}
  .tile{padding:9px 11px}
  .tile .t-title{max-width:60vw}
  .modal{max-height:92vh;border-radius:14px}
  .modal-head{padding:16px 16px}
  .modal-head h2{font-size:18px}
  .stats{padding:6px 16px 18px}
  .x{width:40px;height:40px}
}
@media(max-width:380px){
  .diffgrid{grid-template-columns:repeat(auto-fill,minmax(40px,1fr))}
}
/* touch devices: no sticky hover states; press feedback via :active */
@media(hover:none){
  .tile:hover{transform:none;background:var(--bg2)}
  .diffbtn:hover{transform:none;border-color:var(--line)}
  .catbtn:hover{border-color:var(--line)}
  .tile:active{background:var(--panel2)}
  .diffbtn:active{border-color:var(--accent)}
  .catbtn:active{border-color:var(--accent)}
}