:root{
  --bg:#0f1226; --card:#1a1f3d; --accent:#6c5ce7; --accent2:#00cec9;
  --text:#e8eaf6; --muted:#9aa0c7;
  --tile-hot:#8a7bff; --gold:#ffd24a; --ok:#34d399; --radius:14px;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{color:var(--accent2);text-decoration:none}
.site-header{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;background:rgba(0,0,0,.25);position:sticky;top:0;z-index:10}
.logo{font-weight:800;font-size:22px;color:#fff;letter-spacing:.5px}
.logo::before{content:"🎮 "}
nav a{margin-left:18px;color:var(--text);opacity:.85}
nav a:hover{opacity:1;color:var(--accent2)}
main{max-width:960px;margin:0 auto;padding:24px 20px}
.hero{text-align:center;padding:30px 0}
.hero h1{font-size:34px;margin:0 0 8px}
.hero p{color:var(--muted);margin:0}
.game-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:18px;margin:24px 0}
.game-card{background:var(--card);border-radius:14px;padding:20px;text-align:center;transition:transform .15s,border-color .15s;border:1px solid transparent}
.game-card:hover{transform:translateY(-4px);border-color:var(--accent)}
.game-card .thumb{font-size:46px;margin-bottom:8px}
.game-card h3{margin:6px 0}
.game-card p{color:var(--muted);font-size:14px;margin:0}
.seo-intro{background:var(--card);border-radius:14px;padding:20px;margin:24px 0}
.ad-slot{margin:16px auto;max-width:960px;padding:0 20px;min-height:80px}
.ad-placeholder{border:1px dashed #444a7a;color:var(--muted);text-align:center;padding:18px;border-radius:10px;font-size:13px;background:rgba(255,255,255,.02)}
.site-footer{text-align:center;color:var(--muted);padding:30px 20px;font-size:13px}
.foot-nav{margin-bottom:10px}
.foot-nav a{margin:0 10px;color:var(--muted);opacity:.85}
.foot-nav a:hover{opacity:1;color:var(--accent2)}
/* game page */
.back{display:inline-block;margin:14px 0;color:var(--muted)}
.game-wrap{max-width:560px;margin:0 auto;position:relative}
.controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:12px 0}
.controls button{background:var(--accent);color:#fff;border:0;padding:9px 16px;border-radius:9px;cursor:pointer;font-size:14px}
.controls button:active{transform:scale(.96)}
.controls select{padding:8px;border-radius:9px;border:1px solid #444a7a;background:var(--card);color:var(--text)}
.controls .iconbtn{all:unset;cursor:pointer;background:var(--card);color:var(--text);width:40px;height:40px;border-radius:11px;display:grid;place-items:center;font-size:17px;transition:.15s;border:1px solid rgba(255,255,255,.08)}
.controls .iconbtn:active{transform:scale(.94)}
.stats{display:flex;gap:18px;color:var(--muted);margin:8px 0;flex-wrap:wrap}
.stats .stat{background:var(--card);border-radius:10px;padding:6px 12px;min-width:74px;text-align:center}
.stats .stat .k{font-size:10.5px;text-transform:uppercase;letter-spacing:.5px;opacity:.8}
.stats .stat .v{font-size:18px;font-weight:700;color:var(--text);font-variant-numeric:tabular-nums}
.status{margin-top:10px;color:var(--accent2);font-weight:600;min-height:22px}
/* photo source UI */
.source-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}
.source-tabs button{background:var(--card);color:var(--text);border:1px solid rgba(255,255,255,.12);padding:8px 14px;border-radius:9px;cursor:pointer;font-size:14px;font:inherit}
.source-tabs button.active{background:var(--accent);border-color:var(--accent);color:#fff}
.photo-panel{margin:10px 0;padding:12px;border:1px dashed rgba(255,255,255,.18);border-radius:10px;display:flex;flex-direction:column;gap:8px;align-items:flex-start}
.upload-btn{display:inline-block;background:var(--accent);color:#fff;padding:8px 14px;border-radius:9px;cursor:pointer;font-size:14px}
.photo-panel .or{color:var(--muted);font-size:13px}
.priv-note{color:var(--muted);font-size:12px}
.gallery-panel{margin:10px 0}
.gallery-thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(74px,1fr));gap:8px}
.gallery-thumbs img{width:100%;aspect-ratio:1/1;border-radius:8px;cursor:pointer;object-fit:cover;display:block;transition:.15s}
.gallery-thumbs img:hover{outline:2px solid var(--accent);transform:translateY(-2px)}
.board--slide.drag-over{outline:2px dashed var(--accent);outline-offset:4px}
.board--slide.photo .tile{background-repeat:no-repeat;background-color:var(--card);color:transparent}

/* ---- shared board stage + fx + win overlay ---- */
.board-stage{position:relative;margin:14px auto}
.fx-canvas{position:fixed;inset:0;pointer-events:none;z-index:60;border-radius:var(--radius)}
.win-overlay{position:fixed;inset:0;display:none;flex-direction:column;gap:10px;align-items:center;justify-content:center;background:rgba(15,18,38,.82);backdrop-filter:blur(3px);border-radius:var(--radius);z-index:70;text-align:center;padding:16px}
.win-overlay.show{display:flex;animation:fade .3s ease}
@keyframes fade{from{opacity:0}to{opacity:1}}
.win-overlay h2{margin:0;font-size:28px;color:var(--ok)}
.win-overlay p{margin:0;color:var(--text)}
.win-overlay .rec{color:var(--gold);font-weight:700}
.win-overlay button{margin-top:6px;background:var(--accent);color:#fff;border:0;padding:10px 18px;border-radius:10px;cursor:pointer;font-weight:700;font:inherit;font-weight:700}

/* ---- sliding puzzle board (absolute-positioned tiles) ---- */
#board{display:grid;gap:8px;margin:14px auto;touch-action:manipulation}
#board.board--memory{min-height:260px}
#board.board--slide{display:block;position:relative;width:min(92vw,420px);aspect-ratio:1/1;background:var(--card);border-radius:var(--radius);box-shadow:0 10px 30px rgba(0,0,0,.35);overflow:hidden}
.tile{position:absolute;display:grid;place-items:center;border-radius:10px;background:linear-gradient(180deg,var(--tile-hot),var(--accent));color:#fff;font-weight:800;cursor:pointer;user-select:none;touch-action:none;transition:transform .16s cubic-bezier(.22,.61,.36,1),background .15s;will-change:transform;font-variant-numeric:tabular-nums;line-height:1;box-shadow:inset 0 1px 0 rgba(255,255,255,.12),0 2px 6px rgba(0,0,0,.3)}
.tile:active{filter:brightness(1.08)}
.tile.empty{background:transparent;box-shadow:none;cursor:default;pointer-events:none}
.tile .movable-arrow{position:absolute;font-size:.34em;color:var(--accent2);opacity:0;transition:opacity .15s;pointer-events:none;line-height:1}
.tile.movable .movable-arrow{opacity:.6}
#board.win .tile{background:linear-gradient(180deg,#3ddc97,#10b981);animation:pop .4s ease}
@keyframes pop{0%{transform:var(--pos,scale(1)) scale(1)}40%{transform:var(--pos,scale(1)) scale(1.08)}100%{transform:var(--pos,scale(1)) scale(1)}}

/* ---- memory match board (3D flip cards) ---- */
.card{position:relative;aspect-ratio:1/1;perspective:800px;cursor:pointer;border:0;border-radius:12px;background:transparent;padding:0}
.card:focus{outline:none}
.card.kb{outline:3px solid var(--tile-hot);outline-offset:3px}
.card-inner{position:absolute;inset:0;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.2,.7,.3,1);will-change:transform}
.card.flipped .card-inner,.card.matched .card-inner{transform:rotateY(180deg)}
.card-face{position:absolute;inset:0;display:grid;place-items:center;border-radius:12px;backface-visibility:hidden;-webkit-backface-visibility:hidden;box-shadow:0 8px 24px rgba(0,0,0,.35);font-size:clamp(24px,7vw,40px)}
.card-back{background:linear-gradient(180deg,var(--accent2),var(--accent));color:rgba(255,255,255,.9);font-weight:800;font-size:clamp(20px,6vw,30px)}
.card-front{background:#fff;transform:rotateY(180deg);color:#1a1f3d}
.card.matched .card-front{background:linear-gradient(180deg,#fff,#e8fff0);outline:2px solid #4ade80}
.card.matched{animation:pop .35s ease}
.card.wrong .card-inner{animation:shake .4s}
@keyframes shake{0%,100%{transform:rotateY(180deg) translateX(0)}25%{transform:rotateY(180deg) translateX(-6px)}75%{transform:rotateY(180deg) translateX(6px)}}
.card.dragging{z-index:50}
.guide-list{display:grid;gap:12px}
.guide-list a{background:var(--card);padding:14px 16px;border-radius:10px;display:block}
.guide-list a:hover{border:1px solid var(--accent)}
article h1{font-size:28px}
article p{color:var(--text)}