/* MAZE 3D — visualiseur de pathfinding multi-étages */
:root{
  --bg:#04070f;
  --panel:#0a121f;
  --border:rgba(120,180,255,.15);
  --border-strong:rgba(120,180,255,.32);
  --text:#e8edf5;
  --text-muted:#a3b0c5;
  --text-soft:#7d8aa1;
  --accent:#5dd4f7;
  --accent-soft:rgba(93,212,247,.12);
  --stair:#c89aff;
}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:.95rem;line-height:1.55;min-height:100vh}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

.topbar{display:flex;align-items:center;gap:1rem;padding:.85rem 1.25rem .85rem 4.5rem;border-bottom:1px solid var(--border);background:rgba(4,7,15,.85);position:sticky;top:0;z-index:5;backdrop-filter:blur(8px)}
.topbar .brand{font-weight:800;letter-spacing:.05em;color:var(--accent)}
.topbar .tag{font-size:.7rem;letter-spacing:.18em;color:var(--text-soft);text-transform:uppercase;margin-left:auto}

.back-to-menu{position:fixed;top:.7rem;left:.7rem;z-index:9999;background:rgba(4,7,15,.85);color:var(--accent);border:1px solid var(--border-strong);padding:.5rem .85rem;border-radius:8px;font-size:.78rem;font-family:inherit;text-decoration:none;letter-spacing:.02em;backdrop-filter:blur(6px);transition:background .15s,border-color .15s}
.back-to-menu:hover,.back-to-menu:focus-visible{background:rgba(93,212,247,.2);border-color:var(--accent);outline:none}

/* Sélecteur de niveau */
.level-bar{padding:.85rem 1.25rem;border-bottom:1px solid var(--border);background:rgba(4,7,15,.6);overflow-x:auto}
.level-bar-inner{display:flex;gap:.6rem;max-width:1400px;margin:0 auto;min-width:max-content}
.level-btn{flex:0 0 auto;background:rgba(0,0,0,.25);border:1px solid var(--border);border-radius:10px;padding:.55rem .85rem;color:var(--text);cursor:pointer;font-family:inherit;text-align:left;transition:background .15s,border-color .15s;min-width:130px}
.level-btn:hover{background:rgba(93,212,247,.08);border-color:var(--border-strong)}
.level-btn.sel{background:rgba(93,212,247,.16);border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.level-btn-num{font-size:.6rem;letter-spacing:.18em;color:var(--text-soft);text-transform:uppercase}
.level-btn-name{font-size:.85rem;font-weight:700;color:var(--accent);margin:.15rem 0}
.level-btn-dim{font-size:.65rem;color:var(--text-muted);font-family:ui-monospace,monospace}
.level-btn-stars{font-size:.7rem;color:#ffd84a;letter-spacing:.05em}

.layout{display:grid;grid-template-columns:280px 1fr 280px;gap:1rem;padding:1.25rem;max-width:1400px;margin:0 auto;align-items:start}
.panel{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:1rem 1.1rem}
.p-title{font-size:.95rem;font-weight:700;margin:1rem 0 .35rem;color:var(--accent)}
.p-title:first-child{margin-top:0}
.p-hint{font-size:.76rem;color:var(--text-muted);margin:0 0 .85rem}

/* Algos */
.algo-list{display:flex;flex-direction:column;gap:.45rem}
.algo-row{display:flex;align-items:flex-start;gap:.55rem;padding:.55rem;border:1px solid var(--border);border-radius:8px;cursor:pointer;background:rgba(0,0,0,.18);transition:background .15s,border-color .15s}
.algo-row:hover{background:rgba(93,212,247,.06)}
.algo-row input{accent-color:var(--c);margin-top:.18rem;cursor:pointer}
.algo-row:has(input:checked){border-color:var(--c);background:color-mix(in srgb,var(--c) 8%,transparent)}
.algo-info{flex:1}
.algo-name{font-weight:700;color:var(--c);font-size:.85rem;display:flex;justify-content:space-between;align-items:baseline;gap:.4rem}
.algo-tag{font-size:.62rem;letter-spacing:.1em;background:rgba(255,255,255,.06);color:var(--text-soft);padding:.05rem .35rem;border-radius:4px;text-transform:uppercase}
.algo-desc{font-size:.72rem;color:var(--text-muted);margin-top:.2rem}

/* Tools */
.tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:.45rem}
.tool{background:var(--accent-soft);border:1px solid var(--border-strong);color:var(--text);font-family:inherit;font-size:.78rem;padding:.55rem .65rem;border-radius:8px;cursor:pointer;text-align:left;transition:background .15s,border-color .15s}
.tool:hover{background:rgba(93,212,247,.2);border-color:var(--accent)}
.tool.sel{background:rgba(93,212,247,.25);border-color:var(--accent);color:#fff}
.tool.span-2{grid-column:span 2}

/* Controls */
.ctrl-grid{display:grid;grid-template-columns:1fr 1fr;gap:.45rem;margin-bottom:.6rem}
.btn{background:rgba(93,212,247,.08);border:1px solid var(--border-strong);color:var(--text);font-family:inherit;font-size:.82rem;padding:.55rem .85rem;border-radius:8px;cursor:pointer;transition:background .15s,border-color .15s}
.btn:hover{background:rgba(93,212,247,.2);border-color:var(--accent)}
.btn:active{transform:translateY(1px)}
.btn.pri{grid-column:span 2;background:rgba(93,212,247,.18);border-color:var(--accent);color:#fff;font-weight:600}
.btn.pri:hover{background:rgba(93,212,247,.32)}

.speed-row{display:flex;align-items:center;gap:.5rem;font-size:.78rem;color:var(--text-muted)}
.speed-row input{flex:1;accent-color:var(--accent)}
.speed-row span{font-variant-numeric:tabular-nums;color:var(--accent);min-width:1.6em;text-align:right}

/* Floor selector */
.floor-bar{display:flex;align-items:center;gap:.7rem;padding:.4rem .55rem;background:rgba(200,154,255,.07);border:1px solid rgba(200,154,255,.22);border-radius:8px;margin-bottom:.6rem}
.floor-lbl{font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--stair)}
.floor-btns{display:flex;gap:.3rem;flex:1}
.floor-btn{background:rgba(0,0,0,.25);border:1px solid var(--border);color:var(--text);padding:.3rem .6rem;border-radius:6px;cursor:pointer;font-family:inherit;font-size:.78rem;font-variant-numeric:tabular-nums}
.floor-btn:hover{border-color:var(--stair)}
.floor-btn.sel{background:rgba(200,154,255,.22);border-color:var(--stair);color:#fff;font-weight:700}
.floor-tag{margin-left:auto;font-size:.65rem;color:var(--text-soft);font-family:ui-monospace,monospace}

/* Canvas */
.grid-panel{display:flex;flex-direction:column;gap:.6rem}
#grid{width:100%;height:auto;display:block;background:#000;border:1px solid var(--border);border-radius:10px;cursor:crosshair;touch-action:none;image-rendering:pixelated}
.legend{display:flex;flex-wrap:wrap;gap:.85rem;font-size:.72rem;color:var(--text-muted);justify-content:center}
.leg{display:inline-flex;align-items:center;gap:.35rem}
.leg i{display:inline-block;width:12px;height:12px;border-radius:3px}
.leg-stair{background:var(--stair) !important;border-radius:50% !important}

/* Stats */
.stat-list{display:flex;flex-direction:column;gap:.5rem}
.stat-card{background:rgba(0,0,0,.2);border:1px solid var(--c,var(--border));border-left-width:4px;border-radius:8px;padding:.55rem .65rem}
.stat-card h4{margin:0 0 .35rem;font-size:.78rem;color:var(--c,var(--text));display:flex;justify-content:space-between;align-items:baseline}
.stat-card h4 .stat-status{font-size:.6rem;color:var(--text-soft);letter-spacing:.1em;text-transform:uppercase}
.stat-card.is-done h4 .stat-status{color:var(--c)}
.stat-row{display:flex;justify-content:space-between;font-size:.72rem;color:var(--text-muted);font-variant-numeric:tabular-nums}
.stat-row b{color:var(--text);font-weight:600}

.winner{margin-top:1rem;padding:.85rem;border:1px solid var(--accent);border-radius:10px;background:rgba(93,212,247,.06);text-align:center}
.winner-lbl{font-size:.68rem;letter-spacing:.16em;color:var(--text-soft);text-transform:uppercase}
.winner-name{font-size:1.15rem;font-weight:800;color:var(--accent);margin-top:.25rem}

/* Vue iso */
.iso-wrap{margin-top:.85rem;padding:.55rem;border:1px solid rgba(200,154,255,.22);border-radius:10px;background:rgba(200,154,255,.04)}
.iso-lbl{font-size:.65rem;letter-spacing:.16em;text-transform:uppercase;color:var(--stair);margin-bottom:.3rem;text-align:center}
#iso{width:100%;height:auto;display:block;background:#03060c;border-radius:6px}

/* Explain */
.explain{max-width:1400px;margin:0 auto;padding:1.25rem 1.25rem 3rem}
.ex-title{font-size:1.05rem;color:var(--accent);margin:0 0 1rem}
.ex-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.9rem}
.ex-card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:1rem 1.1rem;position:relative}
.ex-step{position:absolute;right:.85rem;top:.85rem;background:var(--accent-soft);color:var(--accent);padding:.15rem .5rem;border-radius:6px;font-weight:700;font-size:.7rem;letter-spacing:.04em;font-family:ui-monospace,monospace}
.ex-card h3{font-size:.9rem;margin:0 0 .4rem;color:var(--text)}
.ex-card p{font-size:.78rem;color:var(--text-muted);margin:0;line-height:1.55}
.ex-card code{background:rgba(93,212,247,.08);color:var(--accent);padding:.05rem .35rem;border-radius:4px;font-size:.85em}
.ex-foot{font-size:.78rem;color:var(--text-muted);margin:1rem 0 0;text-align:center;font-style:italic}

/* Responsive */
@media (max-width:1100px){
  .layout{grid-template-columns:1fr;max-width:720px}
  .stats-panel{order:3}
  .left-panel{order:1}
  .grid-panel{order:2}
}
@media (max-width:600px){
  .layout{padding:.6rem;gap:.6rem}
  .panel{padding:.85rem}
  .topbar{padding:.7rem 1rem .7rem 4rem}
  .back-to-menu{font-size:.7rem;padding:.4rem .65rem;top:.4rem;left:.4rem}
  .level-btn{min-width:108px;padding:.4rem .6rem}
  .level-btn-name{font-size:.78rem}
  .level-btn-dim{font-size:.6rem}
}