/* TRAIN — MLP fine-tuning live */
:root{
  --bg:#04070f;
  --panel:#0a121f;
  --panel-2:#0d1626;
  --border:rgba(120,180,255,.15);
  --border-strong:rgba(120,180,255,.32);
  --text:#e8edf5;
  --text-muted:#a3b0c5;
  --text-soft:#7d8aa1;
  --accent:#5dd4f7;
  --accent-2:#2189c4;
  --success:#39ff14;
  --warn:#ffd84a;
  --error:#ff5d5d;
}
*,*::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}

.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);font-size:1.05rem}
.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}

.layout{max-width:1200px;margin:0 auto;padding:1.5rem 1rem 3rem;display:flex;flex-direction:column;gap:1.25rem}
.panel{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:1.25rem 1.35rem;box-shadow:0 4px 30px -12px rgba(0,0,0,.5)}
.panel-sub{background:var(--panel-2)}
.intro .p-hint{max-width:65ch}

.p-title{display:flex;align-items:center;gap:.65rem;margin:0 0 .5rem;font-size:1.15rem;font-weight:700;color:var(--accent)}
.p-title-small{font-size:.9rem;letter-spacing:.06em;text-transform:uppercase;color:var(--text-muted)}
.p-num{display:inline-grid;place-items:center;width:1.6rem;height:1.6rem;background:linear-gradient(140deg,var(--accent),var(--accent-2));color:var(--bg);border-radius:8px;font-weight:800;font-size:.85rem}
.p-hint{color:var(--text-muted);margin:0 0 1rem;font-size:.9rem}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
@media (max-width:900px){ .grid-2{grid-template-columns:1fr} }

/* Canvas de dessin */
.canvas-wrap{display:grid;place-items:center;padding:.5rem 0}
#paint{width:280px;height:280px;background:#fff;border:2px solid var(--border-strong);border-radius:10px;cursor:crosshair;touch-action:none}
.paint-controls{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;margin:.75rem 0}
.paint-controls .hint{font-size:.75rem;color:var(--text-soft)}

.cls-lbl{font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-soft);margin:1rem 0 .4rem}
.cls-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:.4rem}
.cls-btn{background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:.55rem;cursor:pointer;font-family:ui-monospace,SFMono-Regular,monospace;font-size:1.1rem;font-weight:800;display:flex;flex-direction:column;align-items:center;gap:.15rem;transition:border-color .15s,background .15s}
.cls-btn:hover,.cls-btn:focus-visible{border-color:var(--accent);background:rgba(93,212,247,.08);outline:none}
.cls-btn .cls-count{font-size:.65rem;font-weight:500;color:var(--text-soft)}
.cls-btn.has-samples{border-color:var(--success);color:var(--success)}
.cls-btn.has-samples .cls-count{color:var(--success)}

/* Prédiction — preview 28×28 + softmax bars */
.preview-row{display:grid;grid-template-columns:auto 1fr;gap:1.25rem;align-items:start;margin-bottom:.75rem}
.preview-side{display:flex;flex-direction:column;gap:.45rem}
.preview-lbl{font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-soft)}
#preview{width:112px;height:112px;image-rendering:pixelated;background:#fff;border:2px solid var(--border-strong);border-radius:8px;display:block}
@media (max-width:600px){
  .preview-row{grid-template-columns:1fr}
  #preview{width:80px;height:80px}
}
.softmax{display:grid;grid-template-columns:repeat(10,1fr);gap:.35rem;padding:.25rem 0 0;align-items:end;min-height:6.5rem}
.sm-col{display:flex;flex-direction:column;align-items:center;gap:.25rem;height:100%}
.sm-bar{width:100%;height:5rem;background:rgba(0,0,0,.35);border:1px solid var(--border);border-radius:4px;display:flex;flex-direction:column-reverse;overflow:hidden}
.sm-fill{width:100%;height:10%;background:linear-gradient(180deg,var(--accent),var(--accent-2));transition:height .18s ease-out}
.sm-col.top .sm-fill{background:linear-gradient(180deg,var(--success),#0e8a2c)}
.sm-lbl{font-family:ui-monospace,monospace;font-size:.75rem;color:var(--text-soft)}
.sm-col.top .sm-lbl{color:var(--success);font-weight:700}
.pred-top{margin-top:.6rem;padding:.6rem .85rem;background:var(--panel-2);border:1px solid var(--border);border-radius:8px;font-size:.9rem}
.pred-top b{font-family:ui-monospace,monospace;color:var(--accent)}
.top3{margin-top:.5rem;padding:.5rem .85rem;background:var(--panel-2);border:1px solid var(--border);border-radius:8px;font-size:.82rem;color:var(--text-muted);font-family:ui-monospace,monospace}
.top3 b{color:var(--text)}
.top3 .dim{color:var(--text-soft)}

.tip{margin-top:1rem;padding:.85rem 1rem;background:rgba(93,212,247,.06);border:1px solid rgba(93,212,247,.25);border-radius:8px;font-size:.85rem;color:var(--text-muted);line-height:1.55}
.tip ul{margin:.4rem 0 0;padding-left:1.2rem}
.tip li{margin:.15rem 0}
.tip strong{color:var(--text)}
.tip em{color:var(--accent);font-style:normal}

.augment-toggle{display:inline-flex;align-items:center;gap:.4rem;cursor:pointer;color:var(--text-muted);font-size:.82rem;user-select:none;padding:.35rem .55rem;background:var(--panel-2);border:1px solid var(--border);border-radius:6px}
.augment-toggle:hover{border-color:var(--accent);color:var(--text)}
.augment-toggle input{accent-color:var(--accent);cursor:pointer;margin:0}
.augment-toggle input:checked ~ span{color:var(--accent)}

/* Paramètres avancés */
.advanced-params{margin-top:1rem;padding:.65rem .85rem;background:var(--panel-2);border:1px solid var(--border);border-radius:10px}
.advanced-params[open]{padding-bottom:1rem}
.advanced-params summary{cursor:pointer;font-size:.85rem;color:var(--text-muted);font-weight:600;padding:.15rem 0;user-select:none;list-style:none}
.advanced-params summary::-webkit-details-marker{display:none}
.advanced-params summary::before{content:"▸ ";color:var(--accent);display:inline-block;transition:transform .15s;margin-right:.35rem}
.advanced-params[open] summary::before{transform:rotate(90deg)}
.advanced-params summary:hover{color:var(--text)}
.params-lead{margin:.75rem 0 1rem;padding:.7rem .9rem;background:rgba(93,212,247,.06);border:1px solid rgba(93,212,247,.25);border-radius:6px;font-size:.85rem;color:var(--text-muted);line-height:1.5}
.params-lead strong{color:var(--text)}
.params-lead em{color:var(--accent);font-style:normal}
.params-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:.9rem;margin-bottom:.85rem}
.param{display:flex;flex-direction:column;gap:.35rem}
.param label{font-size:.78rem;color:var(--text);font-weight:600;letter-spacing:.02em}
.param input[type="number"]{background:var(--panel);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:.5rem .65rem;font-family:ui-monospace,monospace;font-size:.9rem;width:100%}
.param input[type="number"]:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-color:var(--accent)}
.param input.modified{border-color:var(--warn);color:var(--warn)}
.param-hint{font-size:.72rem;color:var(--text-soft);line-height:1.45}
#btn-restore-defaults{font-size:.82rem;padding:.45rem .8rem}
.btn.small{font-size:.82rem;padding:.45rem .8rem}

/* Entraînement */
.train-actions{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;margin-bottom:1rem}
.tf-status{font-size:.8rem;color:var(--text-soft);font-family:ui-monospace,monospace}
.tf-status.ok{color:var(--success)}
.tf-status.err{color:var(--error)}

.chart-wrap{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:.75rem}
@media (max-width:800px){ .chart-wrap{grid-template-columns:1fr} }
.chart-side{background:var(--panel-2);border:1px solid var(--border);border-radius:8px;padding:.65rem .85rem}
.chart-lbl{font-size:.72rem;color:var(--text-soft);text-transform:uppercase;letter-spacing:.06em;margin-bottom:.45rem}
.chart-side canvas{width:100%;height:120px;display:block;background:rgba(0,0,0,.25);border-radius:4px}

.train-meta{font-size:.82rem;color:var(--text-muted);padding:.6rem .85rem;background:var(--panel-2);border:1px solid var(--border);border-radius:8px;font-family:ui-monospace,monospace}
.train-meta.warn{border-color:var(--warn);color:var(--warn)}
.train-meta.ok{border-color:var(--success);color:var(--success)}

/* Boutons */
.btn{background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:.6rem 1rem;font-family:inherit;font-size:.9rem;font-weight:600;cursor:pointer;transition:background .15s,border-color .15s}
.btn:hover:not(:disabled),.btn:focus-visible:not(:disabled){background:rgba(93,212,247,.1);border-color:var(--accent);outline:none}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.pri{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--bg);border-color:transparent;font-weight:700}
.btn.pri:hover:not(:disabled){filter:brightness(1.08)}

/* Sous le capot */
.tech-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.75rem;margin-top:.75rem}
.tech-card{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:.85rem 1rem}
.tech-card h3{margin:0 0 .35rem;font-size:.9rem;color:var(--accent);font-weight:700}
.tech-card p{margin:0;font-size:.8rem;color:var(--text-muted);line-height:1.5}
.tech-card code{background:rgba(93,212,247,.1);padding:.05rem .3rem;border-radius:3px;font-size:.85em}

/* Animation subtile pendant l'entraînement */
body.is-training .p-num{animation:trainPulse 1.4s ease-in-out infinite}
body.is-training .train-meta{border-color:var(--accent);color:var(--accent);animation:trainPulse 1.4s ease-in-out infinite}
body.is-training #preview{border-color:var(--accent);box-shadow:0 0 20px -4px rgba(93,212,247,.5)}
body.is-training .sm-fill{transition:height .28s ease-out}
@keyframes trainPulse{
  0%,100%{opacity:1}
  50%{opacity:.55}
}
@media (prefers-reduced-motion:reduce){
  .sm-fill,.cls-btn,.btn{transition:none}
  body.is-training .p-num,body.is-training .train-meta{animation:none}
}