/* =========================================================
   Toolkit Studio — shared GAME KIT styles
   ---------------------------------------------------------
   Used by every page in the "Games" category (tools/Chess.html,
   Connect_Four.html, Sudoku.html, Memory_Card_Match.html,
   Tilt_Maze.html). Load it AFTER assets/colors.css.

   Every color below points at the site tokens in colors.css,
   which the header's Theme picker rewrites live — so games
   restyle instantly when the visitor switches theme, exactly
   like every other tool. Canvas/WebGL parts of a game read the
   same tokens through GameKit.theme() in assets/games.js.
   ========================================================= */

:root{
  --gk-bg:var(--color-bg);
  --gk-bg-alt:var(--color-bg-alt);
  --gk-panel:var(--color-surface);
  --gk-raised:var(--color-surface-2);
  --gk-line:var(--color-line);
  --gk-line-soft:var(--color-line-soft);
  --gk-text:var(--color-text);
  --gk-muted:var(--color-text-muted);
  --gk-faint:var(--color-text-faint);
  --gk-accent:var(--color-accent);
  --gk-accent-dark:var(--color-accent-dark);
  --gk-accent-darker:var(--color-accent-darker);
  --gk-accent-light:var(--color-accent-light);
  --gk-accent-ink:var(--color-accent-ink);
  --gk-accent-soft:var(--color-accent-soft);
  --gk-accent-glow:var(--color-accent-glow);
  --gk-ok:var(--color-ok);
  --gk-danger:var(--color-danger);
  --gk-amber:var(--color-amber);
  --gk-radius:16px;
  --gk-radius-sm:11px;
  --gk-shadow:0 1px 2px rgba(15,23,42,.06), 0 10px 28px -16px rgba(15,23,42,.28);
  --gk-shadow-lift:0 2px 4px rgba(15,23,42,.08), 0 16px 34px -18px rgba(15,23,42,.38);
  --gk-ease:cubic-bezier(.2,.8,.2,1);
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{background:var(--gk-bg);color:var(--gk-text);font-family:'Inter',system-ui,sans-serif;font-size:14.5px;line-height:1.55;-webkit-font-smoothing:antialiased;}
h1,h2,h3,h4{font-family:'Sora',system-ui,sans-serif;margin:0;color:var(--gk-text);}
button,input,select{font-family:inherit;color:inherit;}
button{cursor:pointer;}
::selection{background:var(--gk-accent-soft);}
.gk-mono{font-family:'JetBrains Mono',ui-monospace,monospace;}
[hidden]{display:none!important;}
.gk-sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;}

/* ---------- Page shell + heading (same rhythm as other tools) ---------- */
.gk-shell{max-width:1140px;margin:0 auto;padding:18px 16px 70px;}
.gk-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:14px;}
.gk-head h1{font-size:22px;font-weight:700;letter-spacing:-.01em;display:flex;align-items:center;gap:10px;}
.gk-head h1 .gk-badge{font-family:'Inter',sans-serif;font-size:10.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  padding:3px 8px;border-radius:999px;background:var(--gk-accent-soft);color:var(--gk-accent);}
.gk-head p{margin:4px 0 0;font-size:13px;color:var(--gk-muted);max-width:70ch;}
.gk-head-actions{display:flex;gap:8px;flex-wrap:wrap;}

/* ---------- Layout ---------- */
.gk-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:16px;align-items:start;}
.gk-layout.narrow-side{grid-template-columns:minmax(0,1fr) 270px;}
@media (max-width:900px){ .gk-layout,.gk-layout.narrow-side{grid-template-columns:minmax(0,1fr);} }
.gk-col{display:flex;flex-direction:column;gap:14px;min-width:0;}

/* ---------- Surfaces ---------- */
.gk-stage{position:relative;background:color-mix(in srgb,var(--gk-panel),var(--gk-text) 2.5%);border:1px solid var(--gk-line);border-radius:20px;padding:16px;box-shadow:var(--gk-shadow);min-width:0;}
.gk-card{background:var(--gk-panel);border:1px solid var(--gk-line);border-radius:var(--gk-radius);padding:16px;box-shadow:var(--gk-shadow);}
.gk-card h3{font-family:'Inter',sans-serif;font-size:11.5px;font-weight:700;color:var(--gk-muted);text-transform:uppercase;letter-spacing:.07em;margin:0 0 12px;display:flex;align-items:center;justify-content:space-between;gap:8px;}
.gk-card h3 .gk-link{font-size:11.5px;text-transform:none;letter-spacing:0;font-weight:600;color:var(--gk-accent);background:none;border:0;padding:0;}
.gk-card h3 .gk-link:hover{text-decoration:underline;}
.gk-divider{height:1px;background:var(--gk-line-soft);margin:14px 0;border:0;}

/* The playfield "well" — a soft theme-tinted backdrop that 3D scenes
   and boards sit on. Uses only theme tokens so it follows every theme. */
.gk-well{position:relative;border-radius:16px;overflow:hidden;
  background:
    radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--gk-accent) 9%, transparent) 0%, transparent 60%),
    linear-gradient(180deg, color-mix(in srgb,var(--gk-raised),var(--gk-text) 6%), color-mix(in srgb,var(--gk-raised),var(--gk-text) 10%));
  border:1px solid var(--gk-line-soft);}
.gk-canvas-host{position:relative;width:100%;}
.gk-canvas-host canvas{display:block;width:100%!important;height:100%!important;outline:none;touch-action:none;}

/* Loading veil shown while a 3D scene boots */
.gk-loading{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;
  color:var(--gk-muted);font-size:13px;font-weight:600;z-index:4;background:var(--gk-raised);transition:opacity .35s ease;}
.gk-loading.hide{opacity:0;pointer-events:none;}
.gk-spinner{width:30px;height:30px;border-radius:50%;border:3px solid var(--gk-line);border-top-color:var(--gk-accent);animation:gkSpin .8s linear infinite;}
@keyframes gkSpin{to{transform:rotate(360deg);}}

/* ---------- Buttons ---------- */
.gk-btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 15px;min-height:38px;border-radius:var(--gk-radius-sm);
  border:1px solid var(--gk-line);background:var(--gk-panel);color:var(--gk-text);font-size:13px;font-weight:600;line-height:1.1;
  transition:border-color .15s, background .15s, transform .15s var(--gk-ease), box-shadow .15s;white-space:nowrap;user-select:none;}
.gk-btn:hover:not(:disabled){border-color:var(--gk-accent);color:var(--gk-text);}
.gk-btn:active:not(:disabled){transform:translateY(1px);}
.gk-btn:focus-visible,.gk-seg button:focus-visible,.gk-select:focus-visible,.gk-switch input:focus-visible + span{outline:2px solid var(--gk-accent);outline-offset:2px;}
.gk-btn.primary{background:var(--gk-accent);border-color:var(--gk-accent);color:var(--gk-accent-ink);box-shadow:0 6px 16px -8px var(--gk-accent);}
.gk-btn.primary:hover:not(:disabled){background:var(--gk-accent-dark);border-color:var(--gk-accent-dark);color:var(--gk-accent-ink);}
.gk-btn.soft{background:var(--gk-accent-soft);border-color:transparent;color:var(--gk-accent);}
.gk-btn.soft:hover:not(:disabled){border-color:var(--gk-accent);}
.gk-btn.danger:hover:not(:disabled){border-color:var(--gk-danger);color:var(--gk-danger);}
.gk-btn.icon{padding:0;width:38px;min-width:38px;font-size:16px;}
.gk-btn.sm{min-height:32px;padding:6px 11px;font-size:12px;border-radius:9px;}
.gk-btn.sm.icon{width:32px;min-width:32px;font-size:14px;}
.gk-btn.block{width:100%;}
.gk-btn[aria-pressed="true"]{background:var(--gk-accent-soft);border-color:var(--gk-accent);color:var(--gk-accent);}
.gk-btn:disabled{opacity:.45;cursor:not-allowed;}
.gk-btn .gk-ico{font-size:15px;line-height:1;}
.gk-toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;}
.gk-toolbar.center{justify-content:center;}
.gk-toolbar .gk-spacer{flex:1;}

/* ---------- Form controls ---------- */
.gk-field{display:flex;flex-direction:column;gap:6px;margin-bottom:12px;}
.gk-field:last-child{margin-bottom:0;}
.gk-field > label,.gk-label{font-size:11.5px;font-weight:600;color:var(--gk-muted);}
.gk-select{width:100%;padding:9px 34px 9px 11px;border-radius:10px;border:1px solid var(--gk-line);background-color:var(--gk-raised);font-size:13px;
  appearance:none;-webkit-appearance:none;cursor:pointer;
  background-image:linear-gradient(45deg,transparent 50%,var(--gk-muted) 50%),linear-gradient(135deg,var(--gk-muted) 50%,transparent 50%);
  background-position:calc(100% - 17px) 52%,calc(100% - 12px) 52%;background-size:5px 5px;background-repeat:no-repeat;}
.gk-select:hover{border-color:var(--gk-accent);}
.gk-select option{background:var(--gk-panel);color:var(--gk-text);}

/* Segmented control — big, easy tap targets instead of tiny dropdowns */
.gk-seg{display:flex;flex-wrap:wrap;gap:4px;padding:4px;border-radius:12px;background:var(--gk-raised);border:1px solid var(--gk-line-soft);}
.gk-seg button{flex:1 1 auto;min-height:34px;padding:6px 10px;border:0;border-radius:9px;background:transparent;font-size:12.5px;font-weight:600;color:var(--gk-muted);
  transition:background .15s, color .15s, box-shadow .15s;}
.gk-seg button:hover{color:var(--gk-text);}
.gk-seg button[aria-checked="true"],.gk-seg button.on{background:var(--gk-panel);color:var(--gk-accent);box-shadow:0 1px 2px rgba(15,23,42,.08),0 0 0 1px var(--gk-line);}

/* Toggle switch row */
.gk-switch{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:7px 0;font-size:13px;cursor:pointer;user-select:none;}
.gk-switch + .gk-switch{border-top:1px solid var(--gk-line-soft);}
.gk-switch input{position:absolute;opacity:0;width:1px;height:1px;}
.gk-switch span.gk-track{position:relative;flex:0 0 auto;width:38px;height:22px;border-radius:999px;background:var(--gk-line);transition:background .18s;}
.gk-switch span.gk-track::after{content:'';position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.25);transition:transform .18s var(--gk-ease);}
.gk-switch input:checked + span.gk-track{background:var(--gk-accent);}
.gk-switch input:checked + span.gk-track::after{transform:translateX(16px);}
.gk-switch small{display:block;font-size:11.5px;color:var(--gk-faint);}

/* ---------- HUD stat pills ---------- */
.gk-hud{display:flex;gap:8px;flex-wrap:wrap;}
.gk-stat{flex:1 1 80px;min-width:76px;background:var(--gk-raised);border:1px solid var(--gk-line-soft);border-radius:12px;padding:8px 12px;text-align:center;}
.gk-stat .l{display:block;font-size:10px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--gk-muted);}
.gk-stat .v{display:block;font-family:'JetBrains Mono',monospace;font-size:16px;font-weight:700;color:var(--gk-text);margin-top:1px;white-space:nowrap;}
.gk-stat.accent .v{color:var(--gk-accent);}
.gk-stat.warn .v{color:var(--gk-amber);}
.gk-stat.bad .v{color:var(--gk-danger);}

/* ---------- Player bars (turn-based games) ---------- */
.gk-player{display:flex;align-items:center;gap:11px;padding:9px 12px;border-radius:14px;background:var(--gk-raised);border:1px solid var(--gk-line-soft);
  transition:box-shadow .2s, border-color .2s, background .2s;min-width:0;}
.gk-player.active{border-color:var(--gk-accent);box-shadow:0 0 0 3px var(--gk-accent-soft);background:var(--gk-panel);}
.gk-avatar{flex:0 0 auto;width:38px;height:38px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-size:20px;
  background:var(--gk-panel);border:1px solid var(--gk-line);}
.gk-player .gk-pinfo{flex:1;min-width:0;}
.gk-player .gk-pname{font-weight:700;font-size:13.5px;display:flex;align-items:center;gap:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.gk-player .gk-psub{font-size:12px;color:var(--gk-muted);min-height:18px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.gk-clock{flex:0 0 auto;font-family:'JetBrains Mono',monospace;font-size:17px;font-weight:700;padding:6px 11px;border-radius:10px;background:var(--gk-panel);border:1px solid var(--gk-line);min-width:78px;text-align:center;}
.gk-player.active .gk-clock{background:var(--gk-accent);border-color:var(--gk-accent);color:var(--gk-accent-ink);}
.gk-clock.low{color:var(--gk-danger)!important;background:color-mix(in srgb,var(--gk-danger) 12%,var(--gk-panel))!important;border-color:var(--gk-danger)!important;}
.gk-thinking{display:inline-flex;gap:3px;margin-left:2px;}
.gk-thinking i{width:5px;height:5px;border-radius:50%;background:var(--gk-accent);animation:gkDot 1.1s ease-in-out infinite;}
.gk-thinking i:nth-child(2){animation-delay:.15s;} .gk-thinking i:nth-child(3){animation-delay:.3s;}
@keyframes gkDot{0%,100%{opacity:.25;transform:translateY(0);}50%{opacity:1;transform:translateY(-2px);}}

/* ---------- Status banner ---------- */
.gk-status{display:flex;align-items:center;gap:9px;padding:9px 13px;border-radius:12px;background:var(--gk-raised);border:1px solid var(--gk-line-soft);
  font-size:13px;font-weight:600;min-height:40px;}
.gk-status .dot{flex:0 0 auto;width:9px;height:9px;border-radius:50%;background:var(--gk-accent);}
.gk-status.warn{background:color-mix(in srgb,var(--gk-amber) 10%,var(--gk-panel));border-color:color-mix(in srgb,var(--gk-amber) 35%,transparent);}
.gk-status.warn .dot{background:var(--gk-amber);}
.gk-status.bad{background:color-mix(in srgb,var(--gk-danger) 10%,var(--gk-panel));border-color:color-mix(in srgb,var(--gk-danger) 35%,transparent);}
.gk-status.bad .dot{background:var(--gk-danger);}
.gk-status.good .dot{background:var(--gk-ok);}

/* ---------- In-board overlay (pause, etc.) ---------- */
.gk-overlay{position:absolute;inset:0;z-index:6;display:none;align-items:center;justify-content:center;flex-direction:column;gap:12px;text-align:center;padding:20px;
  background:color-mix(in srgb,var(--gk-bg) 84%,transparent);border-radius:inherit;}
.gk-overlay.show{display:flex;animation:gkFade .2s ease;}
.gk-overlay h2{font-size:20px;}
.gk-overlay p{margin:0;color:var(--gk-muted);font-size:13.5px;max-width:42ch;}
@keyframes gkFade{from{opacity:0;}to{opacity:1;}}

/* ---------- Modal dialog (results, help, stats) ---------- */
.gk-modal-back{position:fixed;inset:0;z-index:3500;display:flex;align-items:center;justify-content:center;padding:16px;
  background:rgba(8,12,20,.58);animation:gkFade .18s ease;}
.gk-modal{width:100%;max-width:440px;max-height:calc(100vh - 32px);overflow:auto;background:var(--gk-panel);color:var(--gk-text);border:1px solid var(--gk-line);
  border-radius:20px;padding:22px;box-shadow:0 30px 70px -20px rgba(0,0,0,.45);animation:gkPop .24s var(--gk-ease);}
.gk-modal.wide{max-width:620px;}
@keyframes gkPop{from{opacity:0;transform:translateY(10px) scale(.97);}to{opacity:1;transform:none;}}
.gk-modal-icon{width:58px;height:58px;margin:0 auto 10px;border-radius:18px;display:flex;align-items:center;justify-content:center;font-size:30px;background:var(--gk-accent-soft);}
.gk-modal h2{font-size:20px;text-align:center;}
.gk-modal .gk-modal-msg{text-align:center;color:var(--gk-muted);font-size:13.5px;margin:6px 0 0;}
.gk-modal .gk-modal-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:8px;margin:16px 0 0;}
.gk-modal .gk-modal-actions{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:18px;}
.gk-modal .gk-modal-actions .gk-btn{flex:1 1 140px;}
.gk-modal-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px;}
.gk-modal-head h2{text-align:left;font-size:18px;}
.gk-modal-body{font-size:13.5px;color:var(--gk-muted);line-height:1.6;}
.gk-modal-body h4{font-size:13px;margin:14px 0 6px;color:var(--gk-text);}
.gk-modal-body ul{margin:0;padding-left:18px;}
.gk-modal-body li{margin:3px 0;}
.gk-keys{display:grid;grid-template-columns:auto 1fr;gap:7px 14px;align-items:center;font-size:13px;}
.gk-kbd{display:inline-flex;align-items:center;justify-content:center;min-width:26px;height:24px;padding:0 7px;border-radius:7px;border:1px solid var(--gk-line);
  border-bottom-width:2px;background:var(--gk-raised);font-family:'JetBrains Mono',monospace;font-size:11.5px;font-weight:700;color:var(--gk-text);}

/* ---------- Toast ---------- */
.gk-toast{position:fixed;left:50%;bottom:24px;z-index:3600;transform:translate(-50%,14px);opacity:0;pointer-events:none;
  display:flex;align-items:center;gap:9px;max-width:min(92vw,520px);padding:11px 16px;border-radius:14px;font-size:13px;font-weight:600;
  background:var(--gk-text);color:var(--gk-bg);box-shadow:0 16px 36px -14px rgba(0,0,0,.45);transition:opacity .25s ease, transform .25s var(--gk-ease);}
.gk-toast.show{opacity:1;transform:translate(-50%,0);}

/* ---------- Tables (move lists, stats) ---------- */
.gk-statgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;}
.gk-statgrid .gk-stat{min-width:0;}
.gk-list{max-height:240px;overflow:auto;border-radius:10px;border:1px solid var(--gk-line-soft);background:var(--gk-raised);}
.gk-empty{padding:14px;text-align:center;color:var(--gk-faint);font-size:12.5px;}

/* ---------- Tip banner (first visit) ---------- */
.gk-tip{display:flex;align-items:flex-start;gap:10px;padding:11px 13px;border-radius:12px;background:var(--gk-accent-soft);color:var(--gk-text);font-size:13px;margin-bottom:12px;}
.gk-tip b{color:var(--gk-accent);}
.gk-tip .gk-btn{margin-left:auto;}

/* ---------- About / FAQ block (matches other tool pages) ---------- */
.gk-about{margin-top:18px;background:var(--gk-panel);border:1px solid var(--gk-line);border-radius:var(--gk-radius);padding:18px;}
.gk-about h2{font-size:15px;margin:0 0 10px;}
.gk-about > p{font-size:13.5px;color:var(--gk-muted);line-height:1.65;margin:0 0 14px;}
.gk-about details{border-top:1px solid var(--gk-line-soft);padding:10px 0;}
.gk-about summary{cursor:pointer;font-weight:600;font-size:13.5px;}
.gk-about details p{font-size:13px;color:var(--gk-muted);line-height:1.6;margin:8px 0 0;}
.gk-footnote{font-size:11.5px;color:var(--gk-faint);text-align:center;margin-top:20px;line-height:1.7;}

/* ---------- Fullscreen ---------- */
.gk-fs-target:fullscreen{background:var(--gk-bg);}
.gk-fs-target:-webkit-full-screen{background:var(--gk-bg);}

/* ---------- Confetti layer ---------- */
.gk-confetti{position:fixed;inset:0;pointer-events:none;z-index:3400;}

/* ---------- Eye comfort: softened brightness + optional warm tint ----------
   --gk-dim / --gk-warm are set by GameKit from the player's Comfort settings. */
.gk-layout > .gk-stage,.gk-layout > .gk-col{filter:brightness(var(--gk-dim,1)) sepia(var(--gk-warm,0));}

/* ---------- Little effects ---------- */
.gk-fx{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:3300;}
.gk-float{position:fixed;z-index:3301;transform:translate(-50%,-50%);pointer-events:none;white-space:nowrap;
  font-family:'Sora',sans-serif;font-weight:800;font-size:20px;color:var(--gk-accent);
  text-shadow:0 2px 0 var(--gk-panel),0 6px 16px rgba(0,0,0,.25);animation:gkFloat 1.25s var(--gk-ease) forwards;}
@keyframes gkFloat{0%{opacity:0;transform:translate(-50%,-30%) scale(.7);}18%{opacity:1;transform:translate(-50%,-60%) scale(1.08);}100%{opacity:0;transform:translate(-50%,-190%) scale(1);}}

/* ---------- Maximize (immersive) mode ---------- */
.gk-layout{--gk-avail:100vh;}
.gk-maxbtn .gk-btn-text,.gk-btn .gk-btn-text{font-weight:700;}
.gk-maxbar{display:none;position:absolute;top:10px;left:18px;right:18px;align-items:center;gap:8px;z-index:30;}
.gk-maxbar-title{margin-right:auto;font-family:'Sora',sans-serif;font-weight:700;font-size:14px;color:var(--gk-muted);}
.gk-layout.gk-max{--gk-avail:calc(100vh - 70px);position:relative;background:var(--gk-bg);padding:58px 18px 18px;overflow:auto;align-content:start;max-width:none;width:100%;height:100%;}
.gk-layout.gk-max-fixed{position:fixed;inset:0;z-index:3000;height:auto;}
.gk-max .gk-maxbar{display:flex;}
.gk-layout.gk-max.gk-nopanel{grid-template-columns:minmax(0,1fr)!important;}
.gk-layout.gk-max.gk-nopanel > .gk-col{display:none;}
html.gk-max-open body{overflow:hidden;}
@media (max-width:560px){ .gk-btn .gk-btn-text{display:none;} .gk-layout.gk-max{padding:52px 8px 8px;} }

@media (max-width:560px){
  .gk-shell{padding:14px 12px 60px;}
  .gk-stage{padding:12px;border-radius:16px;}
  .gk-head h1{font-size:20px;}
  .gk-clock{font-size:15px;min-width:66px;padding:5px 8px;}
  .gk-hud{gap:6px;}
  .gk-stat{flex:1 1 60px;min-width:60px;padding:7px 6px;}
  .gk-stat .v{font-size:14.5px;}
  .gk-stat .l{font-size:9px;letter-spacing:.05em;}
  .gk-avatar{width:34px;height:34px;font-size:18px;}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;}
}