:root{--blue:#1E4A7A;--blue2:#2A6CB6;--beige:#F3EBDD;--bg:#F7F2E7;--card:#fff;--text:#1A2332;--muted:#6B7280;--line:#E5DCC8}
[data-theme="dark"]{--bg:#121A26;--card:#1B2738;--text:#F1EEDF;--muted:#A8B0BE;--line:#2E3D52;--beige:#24344A}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;background:var(--bg);color:var(--text)}body.font-small{font-size:14px}body.font-large{font-size:18px}
#splash{position:fixed;inset:0;background:var(--blue);color:#fff;display:grid;place-content:center;justify-items:center;z-index:300;transition:opacity .4s}
.splash-logo{font-size:64px}.splash-name{font-size:30px;letter-spacing:6px;font-weight:800}
.splash-bar{width:120px;height:4px;background:rgba(255,255,255,.25);border-radius:99px;margin-top:18px;overflow:hidden}
.splash-bar span{display:block;height:100%;width:40%;background:#fff;animation:load 1.1s infinite}
@keyframes load{0%{transform:translateX(-100%)}100%{transform:translateX(300%)}}
#splash.hide{opacity:0;pointer-events:none}
/* BURGER : toujours au dessus, jamais caché par le menu */
.burger{display:none;position:fixed;top:14px;left:14px;z-index:120;background:var(--blue);color:#fff;border:0;width:44px;height:44px;border-radius:12px;cursor:pointer;align-items:center;justify-content:center}
.burger:active{transform:scale(.95)}
.overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:90}
.overlay.open{display:block}
/* SIDEBAR */
.sidebar{position:fixed;left:0;top:0;bottom:0;width:264px;background:var(--blue);color:#fff;padding:20px 14px;display:flex;flex-direction:column;z-index:100;transition:transform .25s ease}
#sidebar{position:fixed;left:0;top:0;bottom:0;width:264px;background:var(--blue);color:#fff;padding:20px 14px;display:flex;flex-direction:column;z-index:100;transition:transform .25s ease}
.logo{display:flex;gap:10px;align-items:center;font-size:22px;letter-spacing:2px}.logo-ic{width:42px;height:42px;background:rgba(255,255,255,.18);border-radius:12px;display:grid;place-items:center}
nav{display:flex;flex-direction:column;gap:6px;margin-top:26px}
.nav-btn{background:transparent;border:0;color:#fff;padding:12px;border-radius:12px;display:flex;gap:10px;align-items:center;cursor:pointer;font-size:16px;width:100%;text-align:left}
.nav-btn.active,.nav-btn:hover{background:rgba(255,255,255,.16)}
.side-label{margin:22px 6px 8px;font-size:12px;letter-spacing:1px;opacity:.7}
.work-modes button{width:100%;background:transparent;border:0;color:#fff;padding:10px 12px;border-radius:10px;display:flex;justify-content:space-between;cursor:pointer;text-align:left}
.work-modes button:hover{background:rgba(255,255,255,.12)}
.info-link{width:100%;background:transparent;border:0;color:#fff;padding:10px 12px;border-radius:10px;display:flex;gap:10px;align-items:center;cursor:pointer;margin-top:8px}
.info-link:hover{background:rgba(255,255,255,.12)}
.side-foot{margin-top:auto;display:flex;gap:8px;font-size:13px;align-items:center}.dot{width:10px;height:10px;border-radius:50%;background:#4ade80}
/* PAGES : vrai système */
main{margin-left:264px;padding:28px;max-width:900px}
.page{display:none;animation:fade .18s ease}.page.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.home-top{display:flex;justify-content:space-between;align-items:flex-start}
.home-head p{color:var(--blue2);font-weight:700;margin:0}.home-head h1{font-size:32px;line-height:1.15;margin:6px 0 18px}
.info-btn{width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:var(--card);color:var(--text);display:grid;place-items:center;cursor:pointer;flex-shrink:0}
.note-card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:16px}
.note-card input{width:100%;border:0;outline:0;background:transparent;color:var(--text);font:inherit;font-weight:700;font-size:16px;padding:4px 0 10px;border-bottom:1px solid var(--line)}
.note-card textarea{width:100%;min-height:130px;border:0;outline:0;resize:none;background:transparent;color:var(--text);font:inherit;font-size:17px;margin-top:10px}
.composer-bar{display:flex;gap:8px;align-items:center;border-top:1px solid var(--line);padding-top:12px}
.composer-bar button{width:42px;height:42px;border:0;border-radius:50%;background:var(--beige);display:grid;place-items:center;cursor:pointer;color:var(--text);flex-shrink:0}
.send{width:46px!important;height:46px!important;border-radius:50%!important;background:var(--blue)!important;display:grid!important;place-items:center;cursor:pointer;margin-left:auto}
.file-name{font-size:13px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:140px}.transcript{font-size:13px;color:var(--muted);white-space:pre-wrap}
.quick{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.quick button{padding:9px 14px;border:1px solid var(--line);border-radius:99px;background:var(--card);color:var(--text);cursor:pointer}
.sec{margin:20px 0 10px}.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.course-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;cursor:pointer}.course-card p{margin:6px 0 0;font-size:13px}.muted{color:var(--muted)}
.work-head{display:flex;gap:12px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:12px}
.work-head button{background:transparent;border:0;cursor:pointer;color:var(--text);font-size:18px}
.work-title-wrap{flex:1;min-width:0}.work-title-wrap b{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.work-title-wrap span{font-size:12px;color:var(--muted)}
.chat{min-height:52vh;display:flex;flex-direction:column;gap:10px;padding:14px 2px}
.bubble{max-width:85%;padding:12px 14px;border-radius:16px;line-height:1.6;white-space:pre-wrap;font-size:15px}
.bubble.ai{background:var(--card);border:1px solid var(--line);align-self:flex-start}.bubble.me{background:var(--blue);color:#fff;align-self:flex-end}
.mode-chips{display:flex;gap:8px;overflow-x:auto;padding:6px 0}.mode-chips button{white-space:nowrap;padding:8px 12px;border:1px solid var(--line);border-radius:99px;background:var(--card);color:var(--text);cursor:pointer}
.composer{display:flex;gap:8px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:99px;padding:6px 6px 6px 12px}
.composer button{background:transparent;border:0;cursor:pointer;color:var(--text);display:grid;place-items:center}.composer input{flex:1;border:0;outline:0;background:transparent;color:var(--text);font:inherit;min-width:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px}.card label{display:block;margin:14px 0;font-weight:600}.card input,.card select{width:100%;padding:11px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--text);font:inherit;margin-top:6px}.check{display:flex!important;gap:10px;align-items:center}.check input{width:auto!important;margin:0!important}.seg{display:flex;gap:6px;margin-top:6px}.seg-btn{padding:9px 14px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--text);cursor:pointer}.seg-btn.active{background:var(--blue);color:#fff}.btn.danger{background:#B91C1C;color:#fff;border:0;padding:11px 16px;border-radius:12px;cursor:pointer;margin-top:10px}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.55);display:none;place-items:center;z-index:200;padding:16px}.modal.open{display:grid}.modal-card{background:var(--card);color:var(--text);max-width:520px;width:100%;max-height:88vh;overflow:auto;border-radius:20px;padding:24px;position:relative;line-height:1.6}.modal-close{position:absolute;top:12px;right:12px;border:0;background:var(--beige);width:34px;height:34px;border-radius:50%;cursor:pointer;color:var(--text)}.modal-logo{font-size:44px;text-align:center}.modal-card h2{text-align:center;margin:4px 0}.modal-sub{text-align:center;color:var(--muted);margin:0 0 16px}.modal-card h3{margin:16px 0 6px;color:var(--blue)}.rights{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px;font-size:13px;margin-top:16px}.credit-center{text-align:center;font-size:12px;color:var(--muted);margin-top:14px}
@media(max-width:820px){
  #sidebar{transform:translateX(-110%)}
  #sidebar.open{transform:translateX(0)}
  .burger{display:flex}
  main{margin-left:0;padding:76px 14px 24px}
  .grid{grid-template-columns:1fr}.home-head h1{font-size:26px}
}
@media(min-width:821px){ #sidebar{transform:none!important} .overlay{display:none!important} }