/* 15-Puzzle 3D – SepoGames */
:root{--green1:#1f4a2a;--green2:#163a20;--green3:#0f2c17;--cream:#f4e6c8;--ink:#1b2a1a;--gold:#e8d4a2;--terra1:#d9774a;--terra2:#b9562c;--ivory1:#f7ebd2;--ivory2:#e4d2ad;
  --wood1:#b8743f;--wood2:#8a4f25;--board:min(92vw,480px,calc(100svh - 280px));--radius:14px}
*{box-sizing:border-box}
html,body{margin:0}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--cream);min-height:100vh;-webkit-tap-highlight-color:transparent;
  background:radial-gradient(ellipse at 50% 20%,#2b5c36 0,var(--green2) 55%,var(--green3) 100%) fixed}
a{color:var(--gold)}
button,select,input{font:inherit}
.top{display:flex;justify-content:space-between;align-items:center;max-width:560px;margin:0 auto;padding:10px 12px 0;gap:8px}
.brand{color:var(--cream);text-decoration:none;font-weight:700}
.mode-chip{background:rgba(255,255,255,.1);color:var(--cream);border:1.5px solid rgba(232,212,162,.6);border-radius:20px;padding:6px 12px;font-weight:700;cursor:pointer;min-height:38px}
h1.title{margin:4px 0 6px;text-align:center;font-family:Georgia,"Times New Roman",serif;font-size:clamp(34px,10vw,54px);line-height:1.05;color:var(--cream);text-shadow:0 3px 0 rgba(0,0,0,.35),0 6px 14px rgba(0,0,0,.35)}
.stats{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:0 auto 6px;padding:0 8px}
.stat{background:rgba(0,0,0,.22);border:1px solid rgba(232,212,162,.35);border-radius:30px;padding:5px 14px;font-weight:700;font-size:14.5px}
.stat b{font-variant-numeric:tabular-nums;color:#fff}
.status{max-width:520px;margin:0 auto 8px;min-height:1.4em;text-align:center;font-size:15px;color:#d8e6cf;padding:0 10px}
.status.bad{color:#ffc4a8;font-weight:700}.status.good{color:#b9f0a8;font-weight:700}

/* ---------- board (fixed, almost overhead) ---------- */
.stage{display:flex;justify-content:center;perspective:1600px;padding:2px 0 8px}
.frame{position:relative;width:var(--board);aspect-ratio:1/1;padding:calc(var(--board)*.035);border-radius:calc(var(--board)*.06);
  background:linear-gradient(145deg,#cf8a50,var(--wood1) 40%,var(--wood2));transform:rotateX(4deg);
  box-shadow:inset 0 2px 2px rgba(255,230,190,.45),inset 0 -3px 6px rgba(0,0,0,.35),0 10px 0 #5c3216,0 18px 30px rgba(0,0,0,.5)}
.well{position:relative;width:100%;height:100%;border-radius:calc(var(--board)*.035);background:linear-gradient(180deg,#0f2a16,#173d22);box-shadow:inset 0 4px 12px rgba(0,0,0,.6);
  touch-action:manipulation;user-select:none;-webkit-user-select:none}
.well.swipe{touch-action:none}
.tile{position:absolute;left:0;top:0;width:calc(var(--s) - var(--g));height:calc(var(--s) - var(--g));margin:calc(var(--g) / 2);
  transform:translate(calc(var(--c) * 100% + var(--c) * var(--g)),calc(var(--r) * 100% + var(--r) * var(--g)));
  transition:transform .12s ease-out;border:0;padding:0;border-radius:calc(var(--board)*.035);cursor:pointer;
  font-family:Georgia,"Times New Roman",serif;font-weight:700;font-size:calc(var(--board) * var(--fs));color:var(--ink);
  display:flex;align-items:center;justify-content:center;outline:none}
.tile.t{background:radial-gradient(ellipse at 30% 25%,rgba(255,255,255,.18),transparent 60%),linear-gradient(180deg,var(--terra1),var(--terra2));
  box-shadow:inset 0 2px 1px rgba(255,220,190,.5),inset 0 -4px 6px rgba(80,20,0,.35),0 5px 0 #7d3618,0 8px 10px rgba(0,0,0,.4)}
.tile.i{background:radial-gradient(ellipse at 30% 25%,rgba(255,255,255,.5),transparent 60%),linear-gradient(180deg,var(--ivory1),var(--ivory2));
  box-shadow:inset 0 2px 1px #fff,inset 0 -4px 6px rgba(120,90,40,.25),0 5px 0 #a88a58,0 8px 10px rgba(0,0,0,.4)}
.tile.ok::after{content:"";position:absolute;right:9%;bottom:9%;width:9%;height:9%;border-radius:50%;background:#2f7a3a;box-shadow:0 0 0 2px rgba(255,255,255,.7)}
.tile.can{cursor:pointer}
.tile:focus-visible{box-shadow:0 0 0 4px #ffe58a,0 5px 0 #7d3618}
.tile.nope{animation:nope .25s}
.tile.hint{outline:4px solid #ffe58a;outline-offset:-4px;animation:glow 1s ease-in-out infinite}
@keyframes nope{25%{margin-left:calc(var(--g) / 2 - 4px)}75%{margin-left:calc(var(--g) / 2 + 4px)}}
@keyframes glow{50%{outline-color:#fff6c9}}
.reduce .tile{transition:none}.reduce .tile.nope,.reduce .tile.hint{animation:none}
.cover{position:absolute;inset:0;border-radius:inherit;background:rgba(15,42,22,.97);display:flex;flex-direction:column;gap:12px;align-items:center;justify-content:center;font-size:22px;font-weight:800;z-index:5}
.cover[hidden]{display:none}

/* ---------- controls ---------- */
.controls{max-width:520px;margin:12px auto 0;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:0 8px}
.btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;min-height:56px;padding:6px 4px;border-radius:var(--radius);cursor:pointer;
  border:1.5px solid #cdb683;background:linear-gradient(180deg,#f8edd5,#e6d3aa);color:#26331f;font-weight:700;font-size:13px;box-shadow:0 4px 0 #9d8556;line-height:1.1}
.btn .ic{font-size:20px;line-height:1}
.btn:active{transform:translateY(2px);box-shadow:0 2px 0 #9d8556}
.btn:focus-visible{outline:3px solid #ffe58a;outline-offset:2px}
.btn.primary{background:linear-gradient(180deg,#7fa848,#5a8030);color:#fffbea;border-color:#a6c870;box-shadow:0 4px 0 #3b5a1c}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.btn.small{min-height:44px;flex-direction:row;padding:6px 14px;font-size:15px}
.btn[aria-pressed="false"] .ic{filter:grayscale(1)}

dialog{border:2px solid var(--gold);border-radius:18px;background:#fbf3e1;color:#1d2a1b;padding:0;width:94vw;max-width:520px;max-height:90svh}
dialog::backdrop{background:rgba(5,20,10,.6)}
.dlg{padding:16px 18px 18px;line-height:1.5;font-size:15.5px;overflow:auto;max-height:88svh}
.dlg h2{margin:0 0 8px;font-family:Georgia,serif;color:#2d5a2f;font-size:23px}
.dlg h3{margin:14px 0 6px;font-size:16px}
.dlg label{display:block;margin:8px 0 4px;font-weight:700}
.dlg select{width:100%;padding:10px;border-radius:10px;border:1px solid #cdb683;background:#fff}
.dlg .check{display:flex;gap:8px;align-items:center;font-weight:500}
.dlg .check input{width:20px;height:20px;accent-color:#5a8030}
.dlg .actions{display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap;margin-top:14px}
.choices{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.choices button{min-height:54px;border-radius:12px;border:1.5px solid #d8c393;background:#fff;font-weight:700;cursor:pointer;padding:6px}
.choices button small{display:block;font-weight:500;color:#6a6a5a}
.choices button[aria-pressed="true"]{border-color:#5a8030;box-shadow:0 0 0 2px #5a8030}
.kbd{display:inline-block;border:1px solid #bba77a;border-bottom-width:3px;border-radius:6px;padding:0 6px;background:#fff;font-weight:700}
.rgrid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.rgrid div{background:#f1e5c8;border-radius:12px;padding:8px 10px}
.rgrid small{display:block;color:#6a6a5a}.rgrid b{font-size:21px}
.big{font-family:Georgia,serif;font-size:26px;color:#2d5a2f;text-align:center;margin:4px 0 10px}
.badge{display:inline-block;padding:3px 10px;border-radius:12px;font-size:13px;font-weight:700;margin:8px 4px 0 0}
.badge.ok{background:#d8f2d2;color:#2d5a2f}.badge.warn{background:#fdebd0;color:#8a5200}
.stats-table{width:100%;border-collapse:collapse;font-size:14px}
.stats-table th,.stats-table td{border-bottom:1px solid #e3d3ad;padding:5px 4px;text-align:left}

.toast{pointer-events:none;position:fixed;left:50%;bottom:16px;transform:translateX(-50%) translateY(calc(100% + 40px));visibility:hidden;background:#1d1408;color:#fff3d6;border:1px solid var(--gold);padding:11px 16px;border-radius:12px;max-width:92vw;z-index:60;font-size:15px;transition:transform .25s;text-align:center}
.toast.show{transform:translateX(-50%) translateY(0);visibility:visible}
.reduce .toast{transition:none}

.article{max-width:720px;margin:30px auto 0;padding:18px;line-height:1.65;font-size:16px;background:rgba(0,0,0,.25);border-radius:18px;color:#e9f0e3}
.article h2{font-family:Georgia,serif;color:var(--gold);margin:14px 0 8px}
.article h3{color:#ffe7b0;margin:14px 0 6px}
.article details{background:rgba(0,0,0,.25);border-radius:10px;padding:8px 12px;margin:8px 0}
.article summary{cursor:pointer;font-weight:700}
.amz{border:1px dashed rgba(232,212,162,.5);border-radius:12px;padding:10px 12px;margin:16px 0;font-size:14.5px}
.amz small{display:block;color:#b9c8b0;margin-top:6px}
footer.foot{max-width:720px;margin:18px auto 30px;text-align:center;font-size:14px;color:#b9c8b0}
footer.foot a{margin:0 6px}
@media (min-width:640px){.controls{grid-template-columns:repeat(5,1fr)}}