/* Tug of War: Mathematics */
.tw { --blue:#2563eb; --blue-soft:#e8effd; --red:#dc2626; --red-soft:#fdeaea;
  --ink:#1a2233; --muted:#6b7280; --line:#e6e8ee; --panel:#ffffff; --bg:#f4f6fb;
  max-width:1100px; margin:0 auto; padding:16px;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif; }
/* Text sitting on the page (title, back link) inherits the site's theme colour so it stays
   readable in dark mode; every white card below pins its own dark text explicitly. */
.tw *{ box-sizing:border-box; }
.tw .hide{ display:none !important; }

.tw-top{ display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:14px; flex-wrap:wrap; }
.tw-title{ font-size:22px; font-weight:800; letter-spacing:-.02em; margin:0; }
.tw-title span{ color:var(--blue); }
.tw-back{ color:inherit; opacity:.72; text-decoration:none; font-size:14px; font-weight:600; }
.tw-back:hover{ opacity:1; }

/* ---- setup ---- */
.tw-setup{ background:var(--panel); color:var(--ink); border:1px solid var(--line); border-radius:18px; padding:24px; box-shadow:0 10px 30px -18px rgba(20,25,40,.3); max-width:560px; margin:0 auto; }
.tw-setup h2{ margin:0 0 4px; font-size:18px; }
.tw-setup .lead{ color:var(--muted); font-size:14px; margin:0 0 18px; }
.tw-field{ margin-bottom:16px; }
.tw-field > label{ display:block; font-size:12px; font-weight:800; letter-spacing:.05em; text-transform:uppercase; color:var(--muted); margin-bottom:7px; }
.tw-seg{ display:flex; gap:8px; flex-wrap:wrap; }
.tw-seg button{ flex:1; min-width:64px; padding:10px 12px; border:1.5px solid var(--line); background:#fff; color:var(--ink);
  border-radius:11px; font-size:15px; font-weight:700; cursor:pointer; transition:.12s; font-family:inherit; }
.tw-seg button:hover{ border-color:#c7cddb; }
.tw-seg button.on{ border-color:var(--blue); background:var(--blue); color:#fff; box-shadow:0 4px 12px -4px rgba(37,99,235,.5); }
.tw-op{ font-size:20px; }
.tw-start{ width:100%; margin-top:8px; padding:15px; border:0; border-radius:13px; background:var(--blue); color:#fff;
  font-size:17px; font-weight:800; cursor:pointer; box-shadow:0 8px 20px -6px rgba(37,99,235,.55); font-family:inherit; }
.tw-start:hover{ filter:brightness(1.05); }
.tw-hint{ text-align:center; color:var(--muted); font-size:12.5px; margin:12px 0 0; }

/* ---- game board ---- */
.tw-game{ position:relative; }
.tw-hud{ display:flex; align-items:center; justify-content:center; gap:14px; margin-bottom:12px; }
.tw-timer{ font-variant-numeric:tabular-nums; font-weight:800; font-size:18px; background:#fff; color:var(--ink); border:1px solid var(--line); border-radius:999px; padding:6px 16px; }
.tw-hud .tw-back-btn{ border:1px solid var(--line); background:#fff; border-radius:999px; padding:6px 14px; font-weight:700; cursor:pointer; font-family:inherit; color:var(--muted); }

.tw-board{ display:grid; grid-template-columns:1fr 1.15fr 1fr; gap:14px; align-items:stretch; }
@media (max-width:760px){ .tw-board{ grid-template-columns:1fr 1fr; } .tw-arena{ grid-column:1 / -1; order:-1; } }

.tw-team{ background:var(--panel); color:var(--ink); border:2px solid var(--line); border-radius:18px; padding:16px; display:flex; flex-direction:column; gap:12px; transition:.15s; }
.tw-team1{ border-color:var(--blue); background:linear-gradient(180deg,var(--blue-soft),#fff); }
.tw-team2{ border-color:var(--red); background:linear-gradient(180deg,var(--red-soft),#fff); }
.tw-team-name{ font-weight:800; font-size:15px; }
.tw-team1 .tw-team-name{ color:var(--blue); }
.tw-team2 .tw-team-name{ color:var(--red); }
.tw-q{ font-size:clamp(24px,4.6vw,36px); font-weight:800; text-align:center; letter-spacing:-.01em; min-height:1.2em; }
.tw-in{ height:50px; border-radius:12px; background:#0f172a; color:#7CFC98; border:2px solid #0b1220; display:flex; align-items:center; justify-content:center;
  font-size:27px; font-weight:800; font-variant-numeric:tabular-nums; letter-spacing:.08em; font-family:ui-monospace,Menlo,Consolas,monospace; box-shadow:inset 0 2px 9px rgba(0,0,0,.55); }
.tw-keys{ display:grid; grid-template-columns:repeat(3,1fr); gap:9px; }
.tw-key{ padding:16px 0; border:0; border-radius:13px; background:linear-gradient(180deg,#fff,#eef1f6); border-bottom:3px solid #d2d8e4;
  font-size:22px; font-weight:800; cursor:pointer; font-family:inherit; color:var(--ink); user-select:none;
  transition:transform .05s,box-shadow .05s,border-width .05s; box-shadow:0 2px 5px rgba(20,30,60,.09); }
.tw-key:active{ transform:translateY(2px); border-bottom-width:1px; box-shadow:none; }
.tw-key-alt{ color:var(--muted); background:linear-gradient(180deg,#f6f7fa,#e8ecf3); }
.tw-key-ok{ grid-column:1 / -1; color:#fff; font-size:25px; border-bottom-color:rgba(0,0,0,.22); }
.tw-team1 .tw-key-ok{ background:linear-gradient(180deg,#3b82f6,var(--blue)); }
.tw-team2 .tw-key-ok{ background:linear-gradient(180deg,#ef4444,var(--red)); }

/* correct / wrong feedback — bold, obvious */
.tw-team.ok{ animation:tw-pop .42s; border-color:#16a34a !important; background:#e6f8ec !important; box-shadow:0 0 0 6px rgba(22,163,74,.55); }
.tw-team.bad{ animation:tw-shake .38s; border-color:#dc2626 !important; background:#fdeaea !important; box-shadow:0 0 0 6px rgba(220,38,38,.5); }
@keyframes tw-pop{ 0%{transform:scale(1)} 35%{transform:scale(1.04)} 100%{transform:scale(1)} }
@keyframes tw-shake{ 0%,100%{transform:translateX(0)} 20%{transform:translateX(-7px)} 40%{transform:translateX(6px)} 60%{transform:translateX(-4px)} 80%{transform:translateX(3px)} }

/* robot / solo */
.tw-cpu-badge{ display:none; align-items:center; gap:8px; font-size:13px; color:var(--muted); font-weight:600; justify-content:center; }
body.tw-solo #team2 .tw-keys{ display:none; }        /* the computer plays — no keypad */
body.tw-solo #team2 .tw-in{ opacity:.9; }            /* ...but keep its input visible so you see it type */
body.tw-solo #team2 .tw-cpu-badge{ display:flex; }

/* ---- rope arena ---- */
.tw-arena{ background:linear-gradient(180deg,#fbfcff,#eef2f9); color:var(--ink); border:1px solid var(--line); border-radius:18px; padding:18px 16px; display:flex; flex-direction:column; justify-content:center; gap:14px; position:relative; overflow:hidden; box-shadow:inset 0 1px 0 #fff; }
.tw-arena.tug1{ animation:tw-nudge-l .3s; } .tw-arena.tug2{ animation:tw-nudge-r .3s; }
@keyframes tw-nudge-l{ 50%{ transform:translateX(-6px); } } @keyframes tw-nudge-r{ 50%{ transform:translateX(6px); } }
.tw-score{ display:flex; justify-content:space-between; align-items:center; font-weight:900; font-size:40px; font-variant-numeric:tabular-nums; line-height:1; }
.tw-score .s1{ color:var(--blue); text-shadow:0 2px 0 rgba(37,99,235,.15); } .tw-score .s2{ color:var(--red); text-shadow:0 2px 0 rgba(220,38,38,.15); }
.tw-score .vs{ font-size:11px; color:var(--muted); font-weight:800; letter-spacing:.06em; }

/* tension meter: blue fills from the left as team 1 leads */
.tw-tension{ height:12px; border-radius:999px; background:var(--red); overflow:hidden; box-shadow:inset 0 1px 3px rgba(0,0,0,.28); }
.tw-tension-fill{ height:100%; width:50%; background:linear-gradient(90deg,#60a5fa,var(--blue)); transition:width .28s cubic-bezier(.34,1.3,.5,1); box-shadow:2px 0 6px rgba(0,0,0,.18); }

/* rope field */
.tw-track{ position:relative; height:94px; border-radius:14px; background:linear-gradient(180deg,#eef1f7,#e3e9f3); overflow:hidden; box-shadow:inset 0 2px 10px rgba(20,30,60,.09); }
.tw-endzone{ position:absolute; top:0; bottom:0; width:14%; }
.tw-endzone.z1{ left:0; background:linear-gradient(90deg,rgba(37,99,235,.22),transparent); border-left:4px solid var(--blue); }
.tw-endzone.z2{ right:0; background:linear-gradient(270deg,rgba(220,38,38,.22),transparent); border-right:4px solid var(--red); }
.tw-rope-line{ position:absolute; top:50%; left:6%; right:6%; height:9px; transform:translateY(-50%); border-radius:5px;
  background:repeating-linear-gradient(90deg,#caa06a 0 9px,#b07f45 9px 18px); box-shadow:0 2px 4px rgba(0,0,0,.2); }
.tw-mid{ position:absolute; top:10px; bottom:10px; left:50%; width:2px; background:repeating-linear-gradient(180deg,#b3bbca 0 6px,transparent 6px 12px); transform:translateX(-50%); }
.tw-knot{ position:absolute; top:50%; left:50%; width:34px; height:34px; border-radius:50%; transform:translate(-50%,-50%);
  background:radial-gradient(circle at 35% 30%,#fff,#e3c489 58%,#b98a4e); box-shadow:0 5px 12px rgba(0,0,0,.3),0 0 0 3px #fff;
  display:grid; place-items:center; transition:left .28s cubic-bezier(.34,1.5,.5,1); will-change:left; z-index:3; }
.tw-flag{ font-size:24px; transform:translateY(-17px); filter:drop-shadow(0 2px 2px rgba(0,0,0,.25)); }
.tw-puller{ position:absolute; top:50%; transform:translateY(-50%); font-size:30px; z-index:2; filter:drop-shadow(0 2px 3px rgba(0,0,0,.22)); }
.tw-puller.p1{ left:8px; } .tw-puller.p2{ right:8px; transform:translateY(-50%) scaleX(-1); }
.tw-arena.tug1 .tw-puller.p1{ animation:tw-lean-l .3s; } .tw-arena.tug2 .tw-puller.p2{ animation:tw-lean-r .3s; }
@keyframes tw-lean-l{ 50%{ transform:translateY(-50%) rotate(-13deg); } }
@keyframes tw-lean-r{ 50%{ transform:translateY(-50%) scaleX(-1) rotate(-13deg); } }
.tw-arena-foot{ text-align:center; font-size:12.5px; color:var(--muted); }
.tw-arena-foot b{ color:var(--ink); }

/* ---- win overlay ---- */
.tw-win{ position:fixed; inset:0; background:rgba(15,18,28,.55); display:none; align-items:center; justify-content:center; z-index:50; padding:20px; }
.tw-win.show{ display:flex; }
.tw-win-card{ background:#fff; color:var(--ink); border-radius:20px; padding:30px 34px; text-align:center; max-width:360px; box-shadow:0 30px 70px -20px rgba(0,0,0,.5); }
.tw-win.win1 .tw-win-card{ border-top:6px solid var(--blue); } .tw-win.win2 .tw-win-card{ border-top:6px solid var(--red); }
.tw-win-emoji{ font-size:52px; } .tw-win h2{ margin:8px 0 4px; font-size:24px; }
.tw-win p{ color:var(--muted); margin:0 0 18px; }
.tw-win-actions{ display:flex; gap:10px; }
.tw-win-actions button{ flex:1; padding:12px; border-radius:12px; font-weight:800; font-size:15px; cursor:pointer; font-family:inherit; border:1.5px solid var(--line); background:#fff; color:var(--ink); }
.tw-win-actions .primary{ background:var(--blue); color:#fff; border-color:var(--blue); }

/* ---- online rooms ---- */
.two-code{ text-align:center; font-size:13px; color:var(--muted); font-weight:800; letter-spacing:.12em; margin:6px 0 14px; }
.two-code b{ display:block; font-size:46px; letter-spacing:.16em; color:var(--ink); font-variant-numeric:tabular-nums; }
.two-share{ display:flex; gap:8px; margin-bottom:18px; }
.two-share input{ flex:1; padding:12px; border:1.5px solid var(--line); border-radius:11px; font-size:13px; background:#f6f7fa; color:var(--ink); }
.two-share button{ padding:12px 18px; border:0; border-radius:11px; background:var(--blue); color:#fff; font-weight:800; cursor:pointer; font-family:inherit; white-space:nowrap; }
.two-teams{ display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-bottom:18px; }
.two-tcol{ border:2px solid var(--line); border-radius:14px; padding:12px; min-height:120px; }
.two-tcol.blue{ border-color:var(--blue); background:var(--blue-soft); }
.two-tcol.red{ border-color:var(--red); background:var(--red-soft); }
.two-thead{ font-weight:800; margin-bottom:8px; }
.two-tcol.blue .two-thead{ color:var(--blue); } .two-tcol.red .two-thead{ color:var(--red); }
.two-tcol ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:5px; }
.two-tcol li{ font-size:14px; font-weight:600; color:var(--ink); } .two-tcol li.muted{ color:var(--muted); font-weight:400; }
.two-input{ width:100%; padding:13px; border:1.5px solid var(--line); border-radius:11px; font-size:17px; color:var(--ink); background:#fff; }
.two-wait{ text-align:center; margin-top:14px; font-weight:800; color:#16a34a; font-size:15px; }
#two-teampick button[data-team="red"].on{ background:var(--red); border-color:var(--red); box-shadow:0 4px 12px -4px rgba(220,38,38,.5); }

.two-playgrid{ display:grid; grid-template-columns:1.25fr .8fr; gap:14px; align-items:start; }
.two-side{ display:flex; flex-direction:column; gap:12px; }
.two-standings{ display:flex; flex-direction:column; gap:6px; }
.two-srow{ display:flex; align-items:center; gap:9px; background:var(--panel); color:var(--ink); border:1px solid var(--line); border-radius:10px; padding:8px 12px; font-size:14px; font-weight:600; }
.two-srow b{ margin-left:auto; font-variant-numeric:tabular-nums; }
.two-srow .dot{ width:9px; height:9px; border-radius:50%; background:var(--muted); flex:none; }
.two-srow.blue .dot{ background:var(--blue); } .two-srow.red .dot{ background:var(--red); }
.two-srow.me{ outline:2px solid color-mix(in srgb, var(--blue) 45%, transparent); }
.two-srow.muted{ color:var(--muted); font-weight:400; }
body.two-host #two-keypad{ display:none; }
body.two-host .two-playgrid{ grid-template-columns:1.7fr .8fr; }
@media (max-width:760px){ .two-playgrid{ grid-template-columns:1fr; } .two-teams{ grid-template-columns:1fr 1fr; } }

/* face-off: flip the red side so two players sit across a flat tablet (2-player only) */
body.tw-faceoff #team2{ transform:rotate(180deg); }
body.tw-faceoff #team2.ok, body.tw-faceoff #team2.bad{ animation:none; transform:rotate(180deg); } /* keep colour flash, drop the transform pop so rotation holds */

/* attempts log under each keypad — recent 5 visible, scroll for older */
.tw-attempts{ display:flex; flex-direction:column; gap:5px; max-height:150px; overflow-y:auto; margin-top:2px; padding-right:2px; }
.tw-attempts::-webkit-scrollbar{ width:6px; }
.tw-attempts::-webkit-scrollbar-thumb{ background:#c7cddb; border-radius:3px; }
.tw-att{ display:flex; align-items:center; justify-content:space-between; gap:8px; font-size:13px; font-weight:700; padding:6px 10px; border-radius:9px; font-variant-numeric:tabular-nums; }
.tw-att.ok{ background:#e7f8ec; color:#127a3a; }
.tw-att.bad{ background:#fdeaea; color:#c02626; }
.tw-att b{ font-size:14px; flex:none; }

/* win overlay — close/review option */
.tw-win-card{ position:relative; }
.tw-win-close{ position:absolute; top:8px; right:10px; width:32px; height:32px; border:0; background:transparent; color:var(--muted); font-size:18px; cursor:pointer; border-radius:8px; line-height:1; }
.tw-win-close:hover{ background:#eef0f4; color:var(--ink); }
.tw-win-review{ margin:12px 0 0; font-size:12px; color:var(--muted); }

/* WhatsApp share button */
.tw-wa{ background:#25D366; color:#fff; border:0; border-radius:12px; font-size:15px; font-weight:800; padding:13px 16px; cursor:pointer; font-family:inherit; box-shadow:0 6px 16px -6px rgba(37,211,102,.6); white-space:nowrap; }
.tw-wa:hover{ filter:brightness(1.05); }
.two-share{ flex-wrap:wrap; }