/* Une colonne mobile (640 px), barre d'onglets fixe, discussion en pleine page avec zone de saisie fixe. */
  :root{
    --bg:#F6F7FA; --surface:#FFFFFF; --surface-2:#EDF0F6;
    --ink:#1A2233; --ink-dim:#5A6680;
    --accent:#2D4FA8; --accent-ink:#FFFFFF;
    --mark:#F2D45C;
    --line:#DCE1EB;
    --good:#2C7A58; --warn:#A8700F; --crit:#B23B3B;
    --radius:14px; --tabbar-h:58px;
    color-scheme:light;
  }
  @media (prefers-color-scheme: dark){
    :root:not([data-theme="light"]){
      --bg:#12151D; --surface:#1A1F2B; --surface-2:#232A39;
      --ink:#E8ECF5; --ink-dim:#9BA6BD;
      --accent:#8EA8EE; --accent-ink:#0E1730;
      --mark:#D9B93F;
      --line:#2C3447;
      --good:#6DC39B; --warn:#E0B15C; --crit:#EA8D8D;
      color-scheme:dark;
    }
  }
  :root[data-theme="dark"]{
    --bg:#12151D; --surface:#1A1F2B; --surface-2:#232A39;
    --ink:#E8ECF5; --ink-dim:#9BA6BD;
    --accent:#8EA8EE; --accent-ink:#0E1730;
    --mark:#D9B93F;
    --line:#2C3447;
    --good:#6DC39B; --warn:#E0B15C; --crit:#EA8D8D;
    color-scheme:dark;
  }

  /* Base de page (hors artefact) */
  :root{padding-top:env(safe-area-inset-top, 0px); padding-bottom:env(safe-area-inset-bottom, 0px);}
  html{scroll-padding-top:env(safe-area-inset-top, 0px); -webkit-text-size-adjust:100%;}
  body{margin-block:0;}
  img{max-width:100%;}
  [hidden]:not([hidden=until-found i]){display:none !important;}

  *{box-sizing:border-box;}
  body{
    background:var(--bg); color:var(--ink);
    font-family:"Public Sans", system-ui, sans-serif;
    padding-inline:16px; padding-block:0 calc(var(--tabbar-h) + 28px);
    max-width:640px; margin-inline:auto;
  }
  #app[data-view="tutor"][data-composer="on"]{padding-bottom:84px;}
  h1,h2,h3,h4{font-family:"Fraunces", Georgia, serif; font-weight:600; letter-spacing:-0.01em; text-wrap:balance; margin:0;}
  .mono{font-family:"IBM Plex Mono", ui-monospace, monospace; font-variant-numeric:tabular-nums;}
  button{font-family:inherit;}
  a{color:var(--accent);}
  :focus-visible{outline:2px solid var(--accent); outline-offset:2px;}

  /* ---------- Barre du haut ---------- */
  .topbar{display:flex; align-items:center; justify-content:space-between; gap:10px; padding-block:18px 8px;}
  .topbar .brand{min-width:0;}
  .eyebrow{font-size:0.7rem; text-transform:uppercase; letter-spacing:0.09em; color:var(--accent); font-weight:600;}
  .topbar h1{font-size:1.55rem; line-height:1.1;}
  .topbar h1 span{background:linear-gradient(transparent 62%, color-mix(in srgb, var(--mark) 75%, transparent) 62%);}
  .topbar .right{display:flex; align-items:center; gap:8px; min-width:0;}
  .student-chip{
    display:inline-flex; align-items:center; gap:6px; max-width:150px;
    background:var(--surface); border:1px solid var(--line); border-radius:999px;
    padding:7px 11px 7px 13px; font-size:0.84rem; font-weight:600; color:var(--ink); cursor:pointer;
  }
  .student-chip span{overflow:hidden; text-overflow:ellipsis; white-space:nowrap;}
  .student-chip svg{width:14px; height:14px; stroke:currentColor; fill:none; stroke-width:2; flex-shrink:0;}
  .icon-btn{
    background:var(--surface); border:1px solid var(--line); border-radius:10px;
    width:36px; height:36px; display:flex; align-items:center; justify-content:center;
    cursor:pointer; color:var(--ink); flex-shrink:0;
  }
  .icon-btn svg{width:17px; height:17px; stroke:currentColor; fill:none; stroke-width:2;}
  .icon-btn:disabled{opacity:0.35; cursor:default;}

  /* ---------- Éléments communs ---------- */
  .card{background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:16px; margin-bottom:12px;}
  .card h2{font-size:1.05rem; margin-bottom:2px;}
  .card h3{font-size:1rem;}
  .sub{color:var(--ink-dim); font-size:0.85rem;}
  .row{display:flex; align-items:center; gap:10px;}
  .row.between{justify-content:space-between;}
  .row.wrap{flex-wrap:wrap;}
  .grow{flex:1; min-width:0;}
  .view{display:none;}
  .view.active{display:block;}
  .view-title{font-size:1.15rem; margin-bottom:4px;}
  .empty{color:var(--ink-dim); font-size:0.88rem;}
  .btn{
    display:inline-flex; align-items:center; justify-content:center; gap:6px;
    border:1px solid var(--line); background:var(--surface-2); color:var(--ink);
    padding:9px 14px; border-radius:10px; font-size:0.88rem; font-weight:600; cursor:pointer;
    -webkit-tap-highlight-color:transparent;
  }
  .btn:active{transform:scale(0.98);}
  .btn.primary{background:var(--accent); color:var(--accent-ink); border-color:transparent;}
  .btn.ghost{background:transparent;}
  .btn.danger{color:var(--crit); border-color:color-mix(in srgb, var(--crit) 45%, transparent); background:transparent;}
  .btn.small{padding:6px 10px; font-size:0.78rem;}
  .btn:disabled{opacity:0.5; cursor:default;}
  .btn-row{display:flex; gap:8px; flex-wrap:wrap; margin-top:12px;}
  .pill{
    display:inline-flex; align-items:center; gap:4px; font-size:0.72rem; font-weight:600;
    padding:3px 9px; border-radius:999px; background:var(--surface-2); color:var(--ink-dim);
    border:1px solid var(--line); white-space:nowrap;
  }
  .pill.good{color:var(--good); border-color:color-mix(in srgb, var(--good) 40%, transparent);}
  .pill.accent{color:var(--accent); border-color:color-mix(in srgb, var(--accent) 40%, transparent);}
  .pill.warn{color:var(--warn); border-color:color-mix(in srgb, var(--warn) 45%, transparent);}
  .pill.crit{color:var(--crit); border-color:color-mix(in srgb, var(--crit) 45%, transparent);}
  .pill.mark{background:color-mix(in srgb, var(--mark) 35%, transparent); color:var(--ink); border-color:color-mix(in srgb, var(--mark) 60%, transparent);}
  .banner{
    background:var(--surface-2); border:1px solid var(--line); border-radius:12px; padding:10px 12px;
    font-size:0.8rem; color:var(--ink-dim); margin-bottom:12px;
  }
  .banner b{color:var(--ink);}
  .banner.warn{border-color:color-mix(in srgb, var(--warn) 50%, transparent);}
  .form-field{display:flex; flex-direction:column; gap:5px; margin-bottom:14px; min-width:0;}
  .form-field label{font-size:0.8rem; font-weight:600;}
  .form-field label .hint{font-weight:400; color:var(--ink-dim); font-size:0.76rem;}
  .form-field input, .form-field select, .form-field textarea{
    border:1px solid var(--line); border-radius:10px; padding:9px 11px; width:100%;
    background:var(--bg); color:var(--ink); font-family:inherit; font-size:0.9rem;
  }
  .form-field textarea{resize:vertical; line-height:1.4;}
  .form-row{display:flex; gap:10px; flex-wrap:wrap;}
  .form-row .form-field{flex:1; min-width:140px;}
  .chips{display:flex; gap:6px; flex-wrap:wrap;}
  .chip-toggle{
    border:1px solid var(--line); background:var(--bg); color:var(--ink-dim); border-radius:999px;
    padding:6px 11px; font-size:0.8rem; font-weight:600; cursor:pointer;
  }
  .chip-toggle[aria-pressed="true"]{background:color-mix(in srgb, var(--accent) 14%, transparent); color:var(--accent); border-color:color-mix(in srgb, var(--accent) 50%, transparent);}
  .toast{
    position:fixed; left:50%; transform:translateX(-50%); bottom:calc(var(--tabbar-h) + 84px + env(safe-area-inset-bottom, 0px));
    background:var(--ink); color:var(--bg); padding:9px 14px; border-radius:10px; font-size:0.84rem; z-index:60;
    max-width:calc(100% - 32px);
  }

  /* ---------- Discussion ---------- */
  .chat{display:flex; flex-direction:column; gap:10px; padding-block:6px;}
  .bubble{max-width:92%; padding:10px 13px; border-radius:14px; font-size:0.92rem; line-height:1.5; overflow-wrap:anywhere;}
  .bubble.user{align-self:flex-end; background:var(--accent); color:var(--accent-ink); border-bottom-right-radius:4px; white-space:pre-wrap;}
  .bubble.assistant{align-self:flex-start; background:var(--surface); border:1px solid var(--line); border-bottom-left-radius:4px; min-width:0;}
  .bubble.note{align-self:center; background:none; color:var(--ink-dim); font-size:0.78rem; text-align:center; max-width:100%;}
  .md > :first-child{margin-top:0;}
  .md p{margin:0 0 0.6em;}
  .md > :last-child{margin-bottom:0;}
  .md ul, .md ol{margin:0 0 0.6em; padding-left:1.2em;}
  .md li{margin-bottom:0.2em;}
  .md h4{margin:0.5em 0 0.3em; font-size:0.95rem;}
  .md code{font-family:"IBM Plex Mono", ui-monospace, monospace; font-size:0.84em; background:var(--surface-2); padding:1px 5px; border-radius:4px;}
  .md pre{overflow-x:auto; background:var(--surface-2); padding:8px 10px; border-radius:8px; margin:0 0 0.6em;}
  .md pre code{background:none; padding:0;}
  .md .tbl{overflow-x:auto; margin-bottom:0.6em;}
  .md table{border-collapse:collapse; font-size:0.85rem;}
  .md th, .md td{border:1px solid var(--line); padding:4px 8px; text-align:left;}
  .quick{display:flex; gap:8px; flex-wrap:wrap; padding-block:2px 6px;}
  .quick button{
    border:1px solid color-mix(in srgb, var(--accent) 45%, transparent); background:var(--surface);
    color:var(--accent); border-radius:999px; padding:7px 13px; font-size:0.82rem; font-weight:600; cursor:pointer;
  }
  .quick button:disabled{opacity:0.45;}
  .starters{display:flex; flex-direction:column; gap:8px; margin-top:12px;}
  .starters button{
    text-align:left; border:1px solid var(--line); background:var(--bg); color:var(--ink); border-radius:10px;
    padding:10px 12px; font-size:0.88rem; cursor:pointer;
  }
  .starters button b{display:block; font-size:0.86rem;}
  .starters button span{color:var(--ink-dim); font-size:0.78rem;}
  .composer{
    position:fixed; left:0; right:0; z-index:20;
    bottom:calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px));
    max-width:640px; margin-inline:auto; padding:8px 12px;
    background:var(--bg); border-top:1px solid var(--line); display:flex; gap:8px; align-items:flex-end;
  }
  .composer textarea{
    flex:1; min-width:0; resize:none; border:1px solid var(--line); border-radius:12px; padding:10px 12px;
    background:var(--surface); color:var(--ink); font-family:inherit; font-size:0.92rem; max-height:110px; line-height:1.35; overflow-y:hidden;
  }
  .send-btn{
    width:42px; height:42px; border-radius:50%; background:var(--accent); color:var(--accent-ink);
    border:none; flex-shrink:0; display:flex; align-items:center; justify-content:center; cursor:pointer;
  }
  .send-btn svg{width:19px; height:19px; stroke:currentColor; fill:none; stroke-width:2;}
  .send-btn:disabled{opacity:0.45; cursor:default;}
  .send-btn.stop{background:var(--surface-2); color:var(--ink); border:1px solid var(--line);}

  /* ---------- Progrès ---------- */
  .segbar{display:flex; height:8px; border-radius:99px; overflow:hidden; background:var(--surface-2); margin:10px 0 4px;}
  .segbar i{display:block; height:100%;}
  .seg-good{background:var(--good);} .seg-accent{background:var(--accent);} .seg-warn{background:var(--warn);}
  .seg-crit{background:var(--crit);} .seg-dim{background:var(--ink-dim); opacity:0.5;}
  .notion{padding-block:10px; border-top:1px solid var(--line);}
  .notion:first-of-type{border-top:none;}
  .notion .name{font-weight:600; font-size:0.92rem;}
  .notion .meta{color:var(--ink-dim); font-size:0.78rem; margin-top:2px;}
  .notion .watch{font-size:0.8rem; margin-top:4px;}
  .notion .watch b{color:var(--warn);}
  .sess{padding-block:10px; border-top:1px solid var(--line); display:flex; gap:10px; align-items:flex-start; justify-content:space-between;}
  .sess:first-of-type{border-top:none;}
  .sess .when{width:64px; flex-shrink:0; color:var(--ink-dim); font-size:0.78rem; padding-top:2px;}
  .sess .what{flex:1; min-width:0; font-size:0.88rem;}
  .sess .what small{display:block; color:var(--ink-dim); font-size:0.76rem;}

  /* ---------- Révisions ---------- */
  .due-card .row{align-items:flex-start;}
  .late{color:var(--crit); font-weight:600;}
  .step-dots{display:inline-flex; gap:3px; vertical-align:middle;}
  .step-dots i{width:7px; height:7px; border-radius:50%; background:var(--line);}
  .step-dots i.on{background:var(--accent);}

  /* ---------- Parents ---------- */
  .week-nav{display:flex; align-items:center; justify-content:space-between; gap:8px; margin-bottom:10px;}
  .week-label{font-size:0.95rem; font-weight:600; text-align:center; flex:1;}
  .week-sub{font-size:0.74rem; color:var(--ink-dim); font-weight:400; display:block; margin-top:1px;}
  .link-btn{background:none; border:none; color:var(--accent); font-size:0.8rem; font-weight:600; cursor:pointer; text-decoration:underline; text-underline-offset:2px; padding:4px 0;}
  .gate{max-width:340px; margin-inline:auto; text-align:center;}
  .gate input{text-align:center; letter-spacing:0.5em; font-size:1.3rem; font-family:"IBM Plex Mono", monospace;}
  .gate .err{color:var(--crit); font-size:0.84rem; min-height:1.2em; margin-top:6px;}
  .report h2{font-size:1.25rem;}
  .report h3{font-size:0.78rem; text-transform:uppercase; letter-spacing:0.07em; color:var(--accent); font-family:"Public Sans", sans-serif; font-weight:700; margin:20px 0 8px;}
  .report p{margin:0 0 0.6em; font-size:0.92rem; line-height:1.55;}
  .report ul{margin:0; padding-left:1.15em; font-size:0.92rem; line-height:1.5;}
  .report li{margin-bottom:4px;}
  .report .facts{display:flex; flex-wrap:wrap; gap:6px 14px; color:var(--ink-dim); font-size:0.82rem; margin-top:6px;}
  .report .tbl{overflow-x:auto;}
  .report table{border-collapse:collapse; font-size:0.84rem; min-width:520px; width:100%;}
  .report th, .report td{border-bottom:1px solid var(--line); padding:7px 8px; text-align:left; vertical-align:top;}
  .report th{font-size:0.72rem; text-transform:uppercase; letter-spacing:0.05em; color:var(--ink-dim);}
  .report .item{padding:10px 12px; background:var(--surface-2); border-radius:10px; margin-bottom:8px; font-size:0.88rem; line-height:1.5;}
  .report .item b{display:block;}
  .report .item small{display:block; color:var(--ink-dim); font-size:0.8rem; margin-top:3px;}
  .report blockquote{margin:0; padding:10px 14px; border-left:3px solid var(--mark); background:var(--surface-2); border-radius:0 10px 10px 0; font-size:0.92rem; line-height:1.5;}
  .report .legal{margin-top:18px; color:var(--ink-dim); font-size:0.76rem; line-height:1.45;}
  .thinking{display:flex; align-items:center; gap:10px; color:var(--ink-dim); font-size:0.88rem;}
  .spinner{width:16px; height:16px; border-radius:50%; border:2px solid var(--line); border-top-color:var(--accent); animation:spin 0.9s linear infinite;}
  @keyframes spin{to{transform:rotate(360deg);}}

  /* ---------- Réglages ---------- */
  .student-card .head{display:flex; align-items:center; justify-content:space-between; gap:10px; cursor:pointer; background:none; border:none; width:100%; text-align:left; color:inherit; padding:0;}
  .student-card .head .name{font-family:"Fraunces", Georgia, serif; font-weight:600; font-size:1.02rem;}
  .student-card .body{margin-top:14px; padding-top:14px; border-top:1px solid var(--line);}
  .confirm{display:flex; align-items:center; gap:8px; flex-wrap:wrap; margin-top:10px; padding:8px 10px; border:1px solid var(--crit); border-radius:10px;}
  .confirm span{font-size:0.8rem; font-weight:600; color:var(--crit); flex:1; min-width:140px;}

  /* ---------- Barre d'onglets ---------- */
  .tabbar{
    position:fixed; left:0; right:0; bottom:0; z-index:25; background:var(--surface); border-top:1px solid var(--line);
    height:calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px)); padding:6px 4px env(safe-area-inset-bottom, 0px);
    display:flex; justify-content:space-around; max-width:640px; margin-inline:auto;
  }
  .tab-btn{
    background:none; border:none; color:var(--ink-dim); font-size:0.66rem; font-weight:600; position:relative;
    display:flex; flex-direction:column; align-items:center; justify-content:center; gap:3px; padding:2px 4px; border-radius:10px;
    cursor:pointer; flex:1; min-width:0;
  }
  .tab-btn svg{width:21px; height:21px; stroke:currentColor; fill:none; stroke-width:1.7; stroke-linecap:round; stroke-linejoin:round;}
  .tab-btn.active{color:var(--accent);}
  .tab-btn.active::after{content:""; position:absolute; top:-7px; width:26px; height:3px; border-radius:0 0 3px 3px; background:var(--mark);}
  .tab-btn .dot{position:absolute; top:0; right:calc(50% - 20px); min-width:16px; height:16px; padding:0 4px; border-radius:99px; background:var(--crit); color:#fff; font-size:0.62rem; display:flex; align-items:center; justify-content:center;}

  /* ---------- Feuilles ---------- */
  .backdrop{display:none; position:fixed; inset:0; background:color-mix(in srgb, black 45%, transparent); z-index:40;}
  .backdrop.open{display:block;}
  .sheet{
    position:fixed; left:0; right:0; bottom:0; z-index:41; background:var(--surface);
    border-radius:20px 20px 0 0; border:1px solid var(--line); border-bottom:none;
    max-width:640px; margin-inline:auto; max-height:80vh; display:flex; flex-direction:column;
    transform:translateY(105%); transition:transform 0.25s ease; visibility:hidden;
  }
  .sheet.open{transform:translateY(0); visibility:visible;}
  .sheet-head{display:flex; align-items:center; justify-content:space-between; padding:14px 16px 10px; border-bottom:1px solid var(--line); gap:10px;}
  .sheet-head h2{font-size:1rem; flex:1;}
  .sheet-head .close-x{background:none; border:none; color:var(--ink-dim); font-size:1.3rem; cursor:pointer; line-height:1; padding:4px;}
  .sheet-body{padding:14px 16px calc(24px + env(safe-area-inset-bottom, 0px)); overflow-y:auto;}
  .pick{
    display:flex; align-items:center; justify-content:space-between; gap:10px; width:100%; text-align:left;
    background:var(--bg); border:1px solid var(--line); border-radius:12px; padding:12px 14px; margin-bottom:8px;
    color:var(--ink); font-size:0.95rem; cursor:pointer;
  }
  .pick[aria-current="true"]{border-color:var(--accent); background:color-mix(in srgb, var(--accent) 10%, transparent);}
  .copy-area{width:100%; min-height:200px; border:1px solid var(--line); border-radius:10px; padding:10px; background:var(--bg); color:var(--ink); font-family:inherit; font-size:0.85rem;}
  ::selection{background:color-mix(in srgb, var(--accent) 30%, transparent);}
  @media (prefers-reduced-motion: reduce){ *{transition:none !important; animation:none !important;} }

  /* ---------- Connexion ---------- */
  #app[data-auth="out"] > :not(#authView){display:none !important;}
  #app[data-auth="in"] > #authView{display:none;}
  .auth-wrap{max-width:420px; margin-inline:auto; padding-block:40px 24px;}
  .auth-wrap h1{font-size:2.1rem; line-height:1.1; margin-bottom:18px;}
  .auth-wrap h1 span{background:linear-gradient(transparent 62%, color-mix(in srgb, var(--mark) 75%, transparent) 62%);}
  .auth-tabs{display:flex; gap:6px; margin-bottom:14px;}
  .auth-tabs button{flex:1; padding:9px 10px; border:1px solid var(--line); background:var(--bg); color:var(--ink-dim); border-radius:10px; font-weight:600; font-size:0.86rem; cursor:pointer;}
  .auth-tabs button[aria-selected="true"]{background:color-mix(in srgb, var(--accent) 14%, transparent); color:var(--accent); border-color:color-mix(in srgb, var(--accent) 50%, transparent);}
  .auth-err{color:var(--crit); font-size:0.84rem; min-height:1.3em; margin:2px 0 8px;}
  .checkline{display:flex; gap:10px; align-items:flex-start; font-size:0.84rem; color:var(--ink-dim); margin-bottom:14px; line-height:1.4;}
  .checkline input{margin-top:2px; width:18px; height:18px; accent-color:var(--accent); flex-shrink:0;}
  .foot-links{display:flex; gap:14px; flex-wrap:wrap; margin-top:16px; font-size:0.8rem;}
  .legal-page{max-width:640px; margin-inline:auto; padding:24px 16px 48px; line-height:1.55; font-size:0.95rem;}
  .legal-page h1{font-size:1.6rem; margin-bottom:6px;}
  .legal-page h2{font-size:1.05rem; margin:22px 0 6px;}
  .legal-page ul{padding-left:1.2em;}

  /* ---------- Schémas dessinés par le tuteur ---------- */
  .md .schema{margin:0 0 0.7em;}
  .schema img{display:block; width:100%; max-width:420px; height:auto; background:#fff; border:1px solid var(--line); border-radius:12px;}
  .schema-note{color:var(--ink-dim); font-size:0.84rem; padding:8px 10px; background:var(--surface-2); border-radius:10px; margin-bottom:0.6em;}
  .schema-note.pending::before{content:""; display:inline-block; width:12px; height:12px; margin-right:8px; vertical-align:-2px; border-radius:50%; border:2px solid var(--line); border-top-color:var(--accent); animation:spin 0.9s linear infinite;}