:root{
  --bg:#0d1014;
  --panel:#151a21;
  --panel-2:#1b222b;
  --line:#252d38;
  --txt:#e8ecf3;
  --txt-dim:#8b96a8;
  --orange:#ff8b3d;
  --cyan:#3ecfe0;
  --green:#4ade80;
  --yellow:#fbbf24;
  --red:#f8717a;
  --violet:#a78bfa;
  --radius:14px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:
    radial-gradient(1200px 600px at 80% -10%, #1c2531 0%, transparent 60%),
    radial-gradient(900px 500px at -10% 110%, #1a2028 0%, transparent 55%),
    var(--bg);
  color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,sans-serif;
  font-size:15px;line-height:1.5;min-height:100vh;
}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-variant-numeric:tabular-nums}
.hidden{display:none !important}

/* ================= ÉCRAN D'ENTRÉE ================= */
.gate{
  position:fixed;inset:0;z-index:100;display:grid;place-items:center;
  background:radial-gradient(800px 500px at 50% 30%,#1b2431,#0d1014 70%);
  padding:20px;
}
.gate-box{width:100%;max-width:370px;text-align:center}
.gate .gear{
  width:60px;height:60px;border-radius:17px;margin:0 auto 20px;
  background:linear-gradient(135deg,var(--orange),#e2551f);
  display:grid;place-items:center;box-shadow:0 0 40px rgba(255,139,61,.4);
}
.gate h1{font-size:24px;letter-spacing:.2em;margin:0 0 6px}
.gate p{color:var(--txt-dim);font-size:13.5px;margin:0 0 26px}
.gate input{
  width:100%;background:var(--panel);border:1px solid var(--line);color:var(--txt);
  border-radius:12px;padding:14px 16px;font-size:17px;text-align:center;
  letter-spacing:.16em;outline:none;font-family:ui-monospace,Menlo,monospace;
}
.gate input:focus{border-color:var(--orange);box-shadow:0 0 0 3px rgba(255,139,61,.13)}
.gate button{
  width:100%;margin-top:12px;padding:13px;border:none;border-radius:12px;cursor:pointer;
  background:linear-gradient(135deg,var(--orange),#e2551f);color:#1a0d05;
  font-size:15px;font-weight:700;font-family:inherit;transition:.15s;
}
.gate button:hover{filter:brightness(1.1)}
.gate button:disabled{opacity:.5;cursor:default}
.gate-err{color:var(--red);font-size:13px;margin-top:14px;min-height:19px}
.gate .gear{cursor:pointer;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}
.gate .gear.adm{background:linear-gradient(135deg,#a78bfa,#6d4fd4);box-shadow:0 0 40px rgba(167,139,250,.4);cursor:default}
.jauge{
  width:60px;height:3px;margin:-14px auto 14px;border-radius:999px;background:#20272f;
  opacity:0;transition:opacity .25s;overflow:hidden;
}
.jauge>i{display:block;height:100%;width:0;border-radius:999px;background:var(--orange)}
#admBox h1{color:var(--violet)}
#admBox input:focus{border-color:var(--violet);box-shadow:0 0 0 3px rgba(167,139,250,.13)}
#admBox button{background:linear-gradient(135deg,#a78bfa,#6d4fd4);color:#160e2e}

/* bandeau du mode admin */
.bandeau-admin{
  background:linear-gradient(90deg,rgba(167,139,250,.18),rgba(167,139,250,.06));
  border-bottom:1px solid rgba(167,139,250,.35);
  color:#c9b6ff;font-size:12.5px;padding:8px 20px;text-align:center;letter-spacing:.02em;
}
body[data-role="admin"] .grade-badge,
body[data-role="admin"] .xp-wrap{opacity:.4}

/* ================= TOPBAR ================= */
.topbar{
  display:flex;align-items:center;gap:26px;padding:14px 22px;
  border-bottom:1px solid var(--line);background:rgba(16,20,26,.75);
  backdrop-filter:blur(8px);position:sticky;top:0;z-index:20;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand .gear{
  width:38px;height:38px;border-radius:11px;
  background:linear-gradient(135deg,var(--orange),#e2551f);
  display:grid;place-items:center;box-shadow:0 0 22px rgba(255,139,61,.35);
}
.brand h1{font-size:17px;margin:0;letter-spacing:.16em;font-weight:700}
.brand span{display:block;font-size:10.5px;color:var(--txt-dim);letter-spacing:.1em;font-weight:400}
.grade-block{display:flex;align-items:center;gap:14px;flex:1;min-width:250px}
.grade-badge{
  padding:5px 12px;border-radius:999px;font-size:12px;font-weight:600;white-space:nowrap;
  background:rgba(167,139,250,.14);color:var(--violet);border:1px solid rgba(167,139,250,.3);
}
.xp-wrap{flex:1;min-width:130px}
.xp-labels{display:flex;justify-content:space-between;font-size:11px;color:var(--txt-dim);margin-bottom:5px}
.xp-labels b{color:var(--txt)}
.xp-track{height:8px;background:#20272f;border-radius:999px;overflow:hidden}
.xp-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,#7c5cf0,var(--violet),#d8b4fe);
  box-shadow:0 0 14px rgba(167,139,250,.55);transition:width .9s cubic-bezier(.2,.7,.3,1)}
.pill{
  display:flex;align-items:center;gap:7px;font-size:12.5px;color:var(--txt-dim);
  padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:var(--panel);
  cursor:pointer;transition:.15s;
}
.pill:hover{color:var(--txt);border-color:var(--orange)}
.pill b{color:var(--orange)}
.pill.admin{border-color:rgba(167,139,250,.45);color:var(--violet)}

/* ================= LAYOUT ================= */
.wrap{
  display:grid;grid-template-columns:280px minmax(0,1fr) 250px;gap:18px;
  padding:18px 22px 40px;max-width:1600px;margin:0 auto;align-items:start;
}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.card-head{
  padding:12px 16px;border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  background:linear-gradient(180deg,rgba(255,255,255,.03),transparent);
}
.card-head h2{margin:0;font-size:12px;letter-spacing:.13em;color:var(--txt-dim);font-weight:600}
.card-body{padding:14px 16px}

/* ================= BANCS ================= */
.bench{padding:9px 10px;border-radius:10px;transition:background .15s}
.bench:hover{background:var(--panel-2)}
.bench.active{background:var(--panel-2);box-shadow:inset 2px 0 0 var(--orange)}
.bench-top{display:flex;justify-content:space-between;align-items:baseline;gap:8px;margin-bottom:6px}
.bench-name{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bench-name i{font-style:normal;color:var(--txt-dim);font-size:11px;margin-right:6px}
.bench-score{font-size:13px;font-weight:700}
.bar{height:6px;background:#20272f;border-radius:999px;overflow:hidden;display:block}
.bar>i{display:block;height:100%;border-radius:999px;transition:width 1s cubic-bezier(.2,.7,.3,1)}
.bench-tier{font-size:10.5px;color:var(--txt-dim);margin-top:5px}
.legend{display:flex;flex-wrap:wrap;gap:5px 12px;padding:12px 16px;border-top:1px solid var(--line);font-size:10.5px;color:var(--txt-dim)}
.legend span{display:flex;align-items:center;gap:5px}
.dot{width:8px;height:8px;border-radius:3px;display:inline-block}
.lacune{display:flex;gap:9px;font-size:12.5px;padding:9px 0;border-bottom:1px solid var(--line)}
.lacune:last-child{border:0;padding-bottom:0}
.sev{width:3px;border-radius:2px;flex-shrink:0}
.lacune small{color:var(--txt-dim);display:block;font-size:10.5px;margin-top:2px}
.vide{color:var(--txt-dim);font-size:12.5px;font-style:italic}

/* ================= CHAT ================= */
.chat{display:flex;flex-direction:column;height:calc(100vh - 128px);min-height:440px}
.chat-log{flex:1;overflow-y:auto;padding:20px 22px;display:flex;flex-direction:column;gap:16px}
.chat-log::-webkit-scrollbar{width:9px}
.chat-log::-webkit-scrollbar-thumb{background:#2a323d;border-radius:9px}
.msg{display:flex;gap:11px;max-width:90%;animation:pop .3s cubic-bezier(.2,.8,.3,1)}
@keyframes pop{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.msg .av{width:30px;height:30px;border-radius:9px;flex-shrink:0;display:grid;place-items:center;font-size:13px;font-weight:700}
.msg.prof .av{background:linear-gradient(135deg,var(--orange),#e2551f);color:#1a0d05}
.msg.eleve{align-self:flex-end;flex-direction:row-reverse}
.msg.eleve .av{background:linear-gradient(135deg,var(--cyan),#1f8f9e);color:#04222a}
.bubble{background:var(--panel-2);border:1px solid var(--line);padding:11px 14px;border-radius:13px;font-size:14.5px;min-width:0;overflow-x:auto}
.msg.prof .bubble{border-top-left-radius:4px}
.msg.eleve .bubble{border-top-right-radius:4px;background:rgba(62,207,224,.09);border-color:rgba(62,207,224,.25)}
.bubble p{margin:0 0 9px}
.bubble p:last-child{margin:0}
.bubble strong{color:var(--orange);font-weight:600}
.msg.eleve .bubble strong{color:var(--cyan)}
.bubble ul,.bubble ol{margin:6px 0;padding-left:20px}
.bubble li{margin:3px 0}
.bubble code{background:#0f1419;border:1px solid var(--line);border-radius:5px;padding:1px 5px;font-size:13px;font-family:ui-monospace,Menlo,monospace}
.bubble pre{background:#0f1419;border:1px solid var(--line);border-radius:9px;padding:11px 13px;overflow-x:auto;margin:9px 0}
.bubble pre code{background:none;border:none;padding:0}
.bubble table{border-collapse:collapse;margin:10px 0;font-size:13px;width:auto}
.bubble th,.bubble td{border:1px solid var(--line);padding:6px 11px;text-align:center}
.bubble th{background:#141a20;color:var(--txt-dim);font-weight:600;font-size:11.5px;letter-spacing:.05em}
.bubble svg{max-width:100%;height:auto;margin:9px 0;display:block}
.bubble hr{border:0;border-top:1px solid var(--line);margin:12px 0}
.bubble .katex{font-size:1.03em}
.bubble .katex-display{margin:12px 0;overflow-x:auto;overflow-y:hidden}
.tex-b{display:block;text-align:center;margin:12px 0;overflow-x:auto}
.tex-i{white-space:nowrap}

.typing{display:flex;gap:4px;padding:4px 2px}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--txt-dim);animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}
.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,60%,100%{opacity:.25;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
.err-box{
  border:1px solid rgba(248,113,122,.4);background:rgba(248,113,122,.08);
  border-radius:11px;padding:11px 14px;font-size:13.5px;color:#ffc4c8;
}
.err-box b{color:var(--red)}

/* ================= GRAPHE ================= */
.schema{margin:11px 0;border:1px solid var(--line);border-radius:11px;
  background:linear-gradient(180deg,#101519,#0c1013);padding:12px}
.schema-title{font-size:10.5px;letter-spacing:.12em;color:var(--txt-dim);margin-bottom:8px;
  display:flex;justify-content:space-between;gap:10px}
.schema-ctrl{display:flex;align-items:center;gap:11px;margin-top:10px;font-size:12px;color:var(--txt-dim)}
.schema-ctrl input[type=range]{flex:1;accent-color:var(--orange);height:4px}
.readout{display:flex;gap:10px;margin-top:9px;flex-wrap:wrap}
.readout div{background:#141a20;border:1px solid var(--line);border-radius:8px;padding:6px 11px;font-size:12px}
.readout span{color:var(--txt-dim);font-size:10.5px;display:block;letter-spacing:.06em}
.readout b{font-size:15px;font-weight:700}

/* ================= COMPOSER ================= */
.composer{border-top:1px solid var(--line);padding:12px 16px;background:var(--panel)}
.quick{display:flex;gap:7px;margin-bottom:10px;flex-wrap:wrap}
.chip{font-size:12px;padding:6px 12px;border-radius:999px;cursor:pointer;
  border:1px solid var(--line);background:var(--panel-2);color:var(--txt-dim);transition:.15s}
.chip:hover{color:var(--txt);border-color:var(--orange);background:rgba(255,139,61,.1)}
.composer-row{display:flex;gap:9px;align-items:flex-end}
.composer textarea{
  flex:1;resize:none;background:var(--panel-2);border:1px solid var(--line);color:var(--txt);
  border-radius:11px;padding:11px 13px;font-family:inherit;font-size:14.5px;
  min-height:44px;max-height:150px;outline:none;
}
.composer textarea:focus{border-color:rgba(255,139,61,.5)}
.send{width:44px;height:44px;border-radius:11px;border:none;cursor:pointer;flex-shrink:0;
  background:linear-gradient(135deg,var(--orange),#e2551f);color:#1a0d05;display:grid;place-items:center;transition:.15s}
.send:hover{filter:brightness(1.12)}
.send:disabled{opacity:.4;cursor:default}

/* ================= RAIL DROIT ================= */
.gauge-wrap{display:grid;place-items:center;padding:4px 0 2px}
.gauge-val{font-size:30px;font-weight:800;line-height:1}
.gauge-sub{font-size:10.5px;color:var(--txt-dim);letter-spacing:.1em;margin-top:3px}
.badges{display:flex;flex-direction:column;gap:8px}
.badge{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;
  border:1px solid var(--line);background:var(--panel-2);font-size:12.5px}
.badge .ic{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-size:13px;flex-shrink:0}
.badge.locked{opacity:.32}
.badge small{display:block;color:var(--txt-dim);font-size:10.5px}
.next{font-size:13px;color:var(--txt-dim);line-height:1.55}
.next b{color:var(--txt)}

/* ================= TOASTS ================= */
.toasts{position:fixed;right:20px;bottom:20px;display:flex;flex-direction:column;gap:9px;z-index:60}
.toast{padding:11px 16px;border-radius:11px;font-size:13.5px;font-weight:600;
  background:var(--panel-2);border:1px solid var(--line);box-shadow:0 10px 30px rgba(0,0,0,.5);
  animation:slide .4s cubic-bezier(.2,.8,.3,1);display:flex;align-items:center;gap:9px}
@keyframes slide{from{opacity:0;transform:translateX(30px)}to{opacity:1;transform:none}}
.toast.xp{border-color:rgba(167,139,250,.45);color:var(--violet)}
.toast.badge-t{border-color:rgba(251,191,36,.45);color:var(--yellow)}
.toast.auto{border-color:rgba(62,207,224,.45);color:var(--cyan)}
.toast.err{border-color:rgba(248,113,122,.45);color:var(--red)}
.toast.ok{border-color:rgba(74,222,128,.45);color:var(--green)}

.sync{font-size:10.5px;color:var(--txt-dim);display:flex;align-items:center;gap:6px}
.sync i{width:7px;height:7px;border-radius:50%;background:var(--green);display:inline-block}
.sync.local i{background:var(--yellow)}
.sync.ko i{background:var(--red)}

@media(max-width:1180px){
  .wrap{grid-template-columns:1fr}
  .chat{height:min(72vh,640px);order:-1}
}
@media(max-width:640px){
  .wrap{padding:12px}
  .topbar{gap:14px;padding:12px 14px}
  .chat-log{padding:14px}
  .msg{max-width:97%}
}