/* Procédia · thème « parchemin d'érudit » (inspiré du système Perplexity, Refero Styles).
   Fond papier chaud, encre brun-noir, un seul accent bleu-vert profond, surfaces plates, filets fins. */
:root{
  --bg:#FAF8F5; --surface:#FDFBFA; --surface-2:#F3F0EA; --hover:#EEEAE3;
  --line:#E7E3DC; --line-2:#D1D1CD;
  --ink:#27251E; --ink-2:#4A4842; --muted:#72706B; --faint:#92918B;
  --accent:#016A71; --accent-ink:#FFFFFF; --accent-soft:#E2EEEE; --accent-deep:#014B50;
  --ok:#2E6B3C; --ok-soft:#E3EFE3; --warn:#9A4A16; --warn-soft:#F7E9DD; --code:#F5F2EC;
  --shadow-1:0 1px 2px rgba(39,37,30,.06); --shadow-2:0 18px 50px rgba(39,37,30,.18);
  --sans:'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono:'IBM Plex Mono', ui-monospace, Menlo, monospace;
  --math:'KaTeX_Main', 'Cambria Math', 'STIX Two Math', Georgia, serif;
  --r-card:16px; --r-input:12px; --r-btn:10px; --r-ghost:6px;
  --tabbar-h:0px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#1A1916; --surface:#211F1C; --surface-2:#2A2824; --hover:#312F2A;
  --line:#33312C; --line-2:#46443E;
  --ink:#ECEAE4; --ink-2:#CBC8C0; --muted:#9C9A92; --faint:#7E7C75;
  --accent:#3FA7AE; --accent-ink:#06191A; --accent-soft:#173033; --accent-deep:#A3D8DB;
  --ok:#86D29A; --ok-soft:#1C3222; --warn:#F0AE7E; --warn-soft:#3A2618; --code:#24221E;
  --shadow-1:0 1px 2px rgba(0,0,0,.3); --shadow-2:0 18px 50px rgba(0,0,0,.55); color-scheme:dark }}
:root[data-theme="dark"]{
  --bg:#1A1916; --surface:#211F1C; --surface-2:#2A2824; --hover:#312F2A;
  --line:#33312C; --line-2:#46443E;
  --ink:#ECEAE4; --ink-2:#CBC8C0; --muted:#9C9A92; --faint:#7E7C75;
  --accent:#3FA7AE; --accent-ink:#06191A; --accent-soft:#173033; --accent-deep:#A3D8DB;
  --ok:#86D29A; --ok-soft:#1C3222; --warn:#F0AE7E; --warn-soft:#3A2618; --code:#24221E;
  --shadow-1:0 1px 2px rgba(0,0,0,.3); --shadow-2:0 18px 50px rgba(0,0,0,.55); color-scheme:dark }

*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased;font-feature-settings:'cv11','ss01'}
[hidden]{display:none!important}
img{max-width:100%}
a{color:var(--accent)} a:hover{color:var(--accent-deep)}
button,input,textarea{font:inherit;color:inherit}
button{cursor:pointer;-webkit-tap-highlight-color:transparent}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
h1,h2,h3{text-wrap:balance;margin:0;font-weight:500;letter-spacing:-.01em}
strong,b{font-weight:600}
.mono{font-family:var(--mono)}
.label{font-size:11px;font-weight:500;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
.muted{color:var(--muted)}
.icon{width:18px;height:18px;flex:none}
.kbd{display:inline-flex;align-items:center;justify-content:center;min-width:22px;height:22px;padding:0 6px;border:1px solid var(--line-2);border-bottom-width:2px;border-radius:6px;font-family:var(--mono);font-size:11px;color:var(--ink-2);background:var(--surface)}

/* ---------- Bienvenue ---------- */
#login{min-height:100%;display:flex;flex-wrap:wrap;align-items:stretch}
.login-hero{flex:1 1 420px;background:var(--accent);color:#FFFFFF;padding:56px max(24px,env(safe-area-inset-left,0px)) 56px 24px;display:flex;flex-direction:column;justify-content:center}
:root[data-theme="dark"] .login-hero{background:#0E3F43}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .login-hero{background:#0E3F43}}
.login-hero-inner{max-width:480px;margin-inline:auto;display:flex;flex-direction:column;gap:36px;width:100%}
.login-hero h1{font-size:clamp(30px,4vw,42px);line-height:1.12;font-weight:500;letter-spacing:-.02em}
.login-hero p{margin:0;font-size:17px;color:#D6ECEC}
.feat{display:flex;gap:14px;align-items:flex-start}
.feat strong{display:block;font-size:15px;font-weight:500}
.feat span{font-size:14px;color:#D6ECEC}
.login-side{flex:1 1 420px;display:flex;align-items:center;justify-content:center;padding:48px max(24px,env(safe-area-inset-right,0px)) 48px 24px}
.login-card{width:100%;max-width:420px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:32px 28px;display:flex;flex-direction:column;gap:20px;box-shadow:var(--shadow-1)}
.btn-cas{min-height:50px;border-radius:var(--r-input);background:var(--ink);color:var(--bg);border:0;font-weight:500;font-size:15px;display:flex;align-items:center;justify-content:center;gap:10px}
.btn-cas:hover{filter:brightness(1.15)}
.note{padding:14px 16px;background:var(--surface-2);border-radius:var(--r-input);font-size:13px;color:var(--ink-2);display:flex;flex-direction:column;gap:8px}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{width:34px;height:34px;border-radius:9px;background:var(--accent);display:flex;align-items:center;justify-content:center;flex:none}
.brand-name{font-weight:600;font-size:17px;line-height:1.2;letter-spacing:-.01em}
.brand-sub{font-size:12px;color:var(--muted)}

/* ---------- Coque ---------- */
#app{min-height:100%;display:flex;align-items:stretch}
#side{flex:0 0 264px;background:var(--bg);border-right:1px solid var(--line);padding:22px 16px;display:flex;flex-direction:column;gap:24px;position:sticky;top:0;height:100vh;overflow:auto}
#main{flex:1 1 auto;min-width:0;display:flex;flex-direction:column;min-height:100vh}
.nav-group{display:flex;flex-direction:column;gap:6px}
.uv-link{display:flex;gap:8px;justify-content:space-between;align-items:center;padding:10px 12px;border-radius:var(--r-btn);background:var(--surface);border:1px solid var(--line);color:var(--ink);font-weight:500;font-size:14px;text-decoration:none}
.uv-link span{font-weight:400;font-size:12px;color:var(--muted)}
.nav{display:flex;flex-direction:column;gap:2px}
.nav button{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--r-btn);border:0;background:transparent;font-size:14px;color:var(--ink-2);text-align:left;min-height:40px}
.nav button .icon{color:var(--muted)}
.nav button:hover{background:var(--hover)}
.nav button[aria-current="page"]{background:var(--accent-soft);color:var(--accent-deep);font-weight:500}
.nav button[aria-current="page"] .icon{color:var(--accent-deep)}
.nav .short{display:none}
.side-res{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--ink-2);padding-inline:4px}
.me{margin-top:auto;display:flex;align-items:center;gap:10px;padding:14px 4px 0;border-top:1px solid var(--line)}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--surface-2);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:500;flex:none;overflow:hidden;color:var(--ink-2)}
button.avatar{padding:0}
.me-txt{display:flex;flex-direction:column;font-size:13px;min-width:0}
.me-txt b{font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.linkbtn{background:none;border:0;padding:0;color:var(--accent);font-size:13px;text-align:left}
.linkbtn:hover{color:var(--accent-deep);text-decoration:underline}
.side-top{display:flex;justify-content:space-between;align-items:center;gap:12px}

/* ---------- En-tête UV ---------- */
.uvhead{background:var(--bg);border-bottom:1px solid var(--line);padding:28px max(20px,env(safe-area-inset-right,0px)) 0 max(20px,env(safe-area-inset-left,0px))}
.wrap{max-width:960px;margin:0 auto;width:100%}
.uvhead .wrap{display:flex;flex-direction:column;gap:18px}
.uvtop{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px}
.uvtop h1{font-size:28px;line-height:1.2;letter-spacing:-.02em}
.actions{display:flex;flex-wrap:wrap;gap:8px}
.btn{min-height:42px;padding:0 15px;border-radius:var(--r-btn);border:1px solid var(--line-2);background:var(--surface);color:var(--ink);font-size:14px;font-weight:500;display:inline-flex;align-items:center;gap:8px;text-decoration:none;transition:background .15s,border-color .15s}
.btn:hover{background:var(--hover);color:var(--ink)}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:transparent}
.btn.primary:hover{background:var(--accent-deep);color:var(--accent-ink)}
:root[data-theme="dark"] .btn.primary:hover{background:#56BAC0}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .btn.primary:hover{background:#56BAC0}}
.btn.soft{background:var(--accent-soft);color:var(--accent-deep);border-color:transparent}
.btn.small{min-height:36px;padding:0 12px;font-size:13px}
.btn:disabled{opacity:.5;cursor:not-allowed}
.tabs{display:flex;gap:2px;overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tabs button{padding:11px 12px;font-size:14px;color:var(--muted);border:0;background:none;border-bottom:2px solid transparent;white-space:nowrap}
.tabs button:hover{color:var(--ink)}
.tabs button[aria-selected="true"]{color:var(--ink);font-weight:500;border-bottom-color:var(--accent)}
.page{flex:1;padding:28px max(20px,env(safe-area-inset-right,0px)) calc(48px + var(--tabbar-h)) max(20px,env(safe-area-inset-left,0px))}
.stack{display:flex;flex-direction:column;gap:20px}
.cols{display:flex;flex-wrap:wrap;gap:20px;align-items:flex-start}
.cols>*{flex:1 1 360px;min-width:0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:20px 22px;display:flex;flex-direction:column;gap:14px;box-shadow:var(--shadow-1)}
.card h2{font-size:17px}
.card-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.resume{flex-direction:row;flex-wrap:wrap;align-items:center;justify-content:space-between;padding:18px 22px}
.resume-l{display:flex;gap:14px;align-items:center;min-width:0}
.tile{width:44px;height:44px;border-radius:12px;background:var(--accent-soft);display:flex;align-items:center;justify-content:center;flex:none;color:var(--accent-deep)}
.list{display:flex;flex-direction:column}
.row{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:11px 0;border:0;border-bottom:1px solid var(--line);font-size:15px;color:var(--ink);background:none;text-align:left;width:100%}
.row:last-child{border-bottom:0}
.row:hover .row-t{color:var(--accent)}
.num{color:var(--faint);font-family:var(--mono);font-size:12px;margin-right:8px}
.pill{padding:3px 10px;border-radius:999px;font-size:12px;font-weight:500;white-space:nowrap;flex:none}
.pill.vu{background:var(--ok-soft);color:var(--ok)}
.pill.encours{background:var(--accent-soft);color:var(--accent-deep)}
.pill.avoir{background:var(--surface-2);color:var(--muted)}
.boxrow{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--r-input);font-size:15px;color:var(--ink);background:var(--surface);text-align:left;width:100%}
.boxrow:hover{border-color:var(--line-2);background:var(--hover)}
.ok-t{font-size:12px;font-weight:500;color:var(--ok)}

/* ---------- Cours / TD / Annales ---------- */
.chap{border:1px solid var(--line);border-radius:var(--r-card);background:var(--surface);overflow:hidden;box-shadow:var(--shadow-1)}
.chap>summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:15px 20px;font-weight:500}
.chap>summary::-webkit-details-marker{display:none}
.chap>summary:hover{background:var(--hover)}
.chap[open]>summary{border-bottom:1px solid var(--line)}
.chap-body{padding:14px 20px 20px;display:flex;flex-direction:column;gap:14px}
.secs{display:flex;flex-direction:column}
.sec{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:8px 0;border-bottom:1px solid var(--line);font-size:14px}
.sec:last-child{border-bottom:0}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{min-height:36px;padding:6px 13px;border:1px solid var(--line-2);border-radius:999px;font-size:13px;background:var(--surface);color:var(--ink-2);display:inline-flex;align-items:center;gap:6px;text-align:left}
.chip .icon{width:16px;height:16px}
.chip:hover{border-color:var(--accent);color:var(--accent-deep);background:var(--surface)}
.chip[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.chip:disabled{opacity:.45;cursor:not-allowed}
.exo{border:1px solid var(--line);border-radius:var(--r-card);background:var(--surface);padding:18px 20px;display:flex;flex-direction:column;gap:12px;box-shadow:var(--shadow-1);scroll-margin-top:16px}
.exo-h{display:flex;justify-content:space-between;gap:12px;align-items:baseline;flex-wrap:wrap}
.exo-h h3{font-size:16px}
.textblock{white-space:pre-wrap;font-size:14px;color:var(--ink-2);line-height:1.6;max-height:220px;overflow:auto;padding-right:6px}
.textblock.open{max-height:none}
.corr{background:var(--surface-2);border-radius:var(--r-input);padding:14px 16px;font-size:14px;line-height:1.65;display:flex;flex-direction:column;gap:6px}
.corr p{margin:0}
.lang{font-size:12px;color:var(--muted)}
.jump{display:flex;gap:6px;flex-wrap:wrap}
.jump button{min-width:40px;min-height:34px;border-radius:8px;border:1px solid var(--line);background:var(--surface);font-size:13px;color:var(--ink-2)}
.jump button:hover{border-color:var(--accent);color:var(--accent-deep)}

/* Capture d'un corrigé manuscrit : seulement les pages de l'exo */
.capture{display:flex;flex-direction:column;gap:10px;background:var(--surface-2);border-radius:var(--r-input);padding:12px}
.capture-top{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.capture-page{position:relative;background:#FFFFFF;border-radius:8px;overflow:hidden;border:1px solid var(--line);cursor:zoom-in}
.capture-page canvas{display:block;max-width:none}
.capture-page .tag{position:absolute;bottom:6px;right:6px;background:rgba(39,37,30,.62);color:#FFF;font-size:10px;font-weight:500;padding:2px 7px;border-radius:999px;pointer-events:none}
.capture .loading{padding:28px;text-align:center;color:var(--muted);font-size:14px}
.exo-box{border:1px solid var(--line);border-radius:var(--r-card);background:var(--surface);padding:12px 16px}
.exo-box>summary{list-style:none;cursor:pointer;display:flex;gap:10px;align-items:baseline;font-weight:500;font-size:14px}
.exo-box>summary::-webkit-details-marker,.exo-corr>summary::-webkit-details-marker{display:none}
.exo-box>summary::after{content:'';margin-left:auto;width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .2s;align-self:center}
.exo-box[open]>summary::after{transform:rotate(-135deg)}
.exo-corr>summary{list-style:none;cursor:pointer;display:inline-flex;gap:6px;align-items:center;font-size:13px;color:var(--accent);padding:6px 0}
.exo-corr>summary .icon{width:16px;height:16px}
.guided .exo-box{background:var(--surface)}
.capture.printed{background:transparent;padding:0}
.capture.printed .capture-top{padding:0 2px}
.capture.printed .capture-page{border-color:var(--line);box-shadow:var(--shadow-1)}
:root[data-theme="dark"] .capture-page canvas{filter:invert(.9) hue-rotate(180deg)}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .capture-page canvas{filter:invert(.9) hue-rotate(180deg)}}
:root[data-theme="dark"] .capture-page,:root[data-theme="dark"] .pdf-page{background:#1A1916}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .capture-page{background:#1A1916}}

/* ---------- Chat ---------- */
.chathead{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:14px max(20px,env(safe-area-inset-right,0px)) 14px max(20px,env(safe-area-inset-left,0px));background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.seg{display:flex;padding:3px;background:var(--surface-2);border-radius:var(--r-btn);gap:2px}
.seg button{border:0;border-radius:8px;padding:8px 13px;font-size:13px;background:transparent;color:var(--muted);min-height:38px}
.seg button[aria-pressed="true"]{background:var(--surface);color:var(--ink);font-weight:500;box-shadow:var(--shadow-1)}
#thread{flex:1;padding:28px max(20px,env(safe-area-inset-right,0px)) 28px max(20px,env(safe-area-inset-left,0px));display:flex;flex-direction:column;gap:22px;max-width:900px;width:100%;margin:0 auto}
.q{align-self:flex-end;max-width:min(560px,88%);background:var(--surface-2);color:var(--ink);padding:12px 16px;border-radius:16px 16px 4px 16px;font-size:15px;white-space:pre-wrap;overflow-wrap:anywhere}
.ans{background:transparent;border:0;padding:4px 2px;display:flex;flex-direction:column;gap:16px;font-size:15.5px;line-height:1.7;min-width:0}
.ans h3{font-size:20px;letter-spacing:-.015em}
.badge{display:inline-flex;align-items:center;gap:6px;padding:3px 10px;border-radius:999px;background:var(--ok-soft);color:var(--ok);font-size:12px;font-weight:500}
.badge .icon{width:14px;height:14px}
.badge.warn{background:var(--warn-soft);color:var(--warn)}
.steps{display:flex;flex-direction:column;gap:16px;counter-reset:s}
.step{display:flex;gap:14px}
.step-n{flex:none;width:26px;height:26px;border-radius:50%;background:var(--accent-soft);color:var(--accent-deep);font-weight:500;font-size:13px;display:flex;align-items:center;justify-content:center;margin-top:2px}
.step>div{min-width:0;display:flex;flex-direction:column;gap:4px}
.step strong{font-weight:500;color:var(--ink)}
.formula{background:var(--code);border:1px solid var(--line);border-radius:var(--r-input);padding:14px 18px;font-family:var(--math);font-size:17px;line-height:1.8;overflow-x:auto;text-align:center}
.formula.plain{text-align:left;font-style:normal}
.retenir{border-left:3px solid var(--accent);background:var(--accent-soft);color:var(--ink);padding:12px 16px;border-radius:0 var(--r-input) var(--r-input) 0;font-size:15px}
.retenir .label{color:var(--accent-deep);display:block;margin-bottom:2px}
.piege{border-left:3px solid var(--warn);background:var(--warn-soft);padding:12px 16px;border-radius:0 var(--r-input) var(--r-input) 0;font-size:15px}
.piege .label{color:var(--warn);display:block;margin-bottom:2px}
.ans p{margin:0}
.sources{display:flex;flex-direction:column;gap:8px;padding-top:14px;border-top:1px solid var(--line)}
.followups{display:flex;flex-wrap:wrap;gap:8px}
.thinking{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:14px}
.dots{display:inline-flex;gap:4px}
.dots i{width:6px;height:6px;border-radius:50%;background:var(--accent);opacity:.3;animation:blink 1.2s infinite}
.dots i:nth-child(2){animation-delay:.2s}.dots i:nth-child(3){animation-delay:.4s}
@keyframes blink{50%{opacity:1}}
.composer{position:sticky;bottom:var(--tabbar-h);background:linear-gradient(to bottom,transparent,var(--bg) 22px);padding:14px max(20px,env(safe-area-inset-right,0px)) calc(18px + env(safe-area-inset-bottom,0px)) max(20px,env(safe-area-inset-left,0px))}
.composer .wrap{max-width:860px;display:flex;flex-direction:column;gap:6px}
.inputbox{display:flex;gap:10px;background:var(--surface);border:1px solid var(--line-2);border-radius:18px;padding:8px 8px 8px 10px;align-items:flex-end;box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 7%,transparent),var(--shadow-1);transition:box-shadow .2s,border-color .2s}
.inputbox:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 16%,transparent)}
.inputbox textarea{flex:1;min-width:0;border:0;font-size:15px;padding:8px 4px;outline:none;background:transparent;resize:none;max-height:180px;line-height:1.45}
.send{width:40px;height:40px;border:0;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;flex:none;color:var(--accent-ink)}
.send:disabled{opacity:.4}
.send.stop{background:var(--ink-2)}
.ctxchip{align-self:flex-start;display:inline-flex;gap:8px;align-items:center;padding:3px 4px 3px 12px;border-radius:999px;background:var(--accent-soft);color:var(--accent-deep);font-size:13px;font-weight:500}
.ctxchip button{border:0;background:none;color:inherit;width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center}
.empty{display:flex;flex-direction:column;gap:16px;padding:20px 0}
.empty h2{font-size:26px;letter-spacing:-.02em}
.err{background:var(--warn-soft);color:var(--warn);border-radius:var(--r-input);padding:12px 14px;font-size:14px}

/* Mode guidé */
.guided{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-1)}
.g-head{padding:16px 20px 14px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:10px}
.g-top{display:flex;justify-content:space-between;align-items:center;gap:12px}
.bar{height:5px;border-radius:999px;background:var(--line)}
.bar>i{display:block;height:5px;border-radius:999px;background:var(--accent);transition:width .3s}
.g-body{padding:18px 20px;display:flex;flex-direction:column;gap:12px;background:var(--bg)}
.bubble{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:16px;font-size:15px;line-height:1.6;display:flex;flex-direction:column;gap:10px}
.choice{min-height:48px;text-align:left;padding:12px 14px;border-radius:var(--r-input);border:1px solid var(--line-2);background:var(--surface);font-size:15px;color:var(--ink);display:flex;gap:10px;align-items:center}
.choice .k{flex:none;width:24px;height:24px;border-radius:6px;border:1px solid var(--line-2);display:flex;align-items:center;justify-content:center;font-size:12px;font-family:var(--mono);color:var(--muted)}
.choice:hover:not(:disabled){border-color:var(--accent);background:var(--hover)}
.choice.good{border-color:var(--ok);background:var(--ok-soft);color:var(--ok);font-weight:500}
.choice.bad{border-color:var(--warn);background:var(--warn-soft);color:var(--warn)}
.choice:disabled{cursor:default}
.done-line{font-size:12px;font-weight:500;color:var(--ok)}
.valrow{display:flex;gap:8px;border:1px solid var(--line-2);border-radius:var(--r-input);padding:5px;background:var(--surface)}
.valrow input{flex:1;min-width:0;border:0;font-size:15px;padding:8px;outline:none;background:transparent}

/* ---------- Flashcards ---------- */
.fc-wrap{max-width:560px;margin:0 auto;width:100%;display:flex;flex-direction:column;gap:14px}
.fc-stage{position:relative;perspective:1400px;touch-action:pan-y;user-select:none;-webkit-user-select:none}
/* les deux faces sont empilées dans la même case de grille : la carte prend la hauteur de la plus longue, sans défilement interne */
.fc-card{position:relative;width:100%;display:grid;transform-style:preserve-3d;-webkit-transform-style:preserve-3d;transition:transform .45s cubic-bezier(.2,.7,.2,1);cursor:pointer}
.fc-card.flipped{transform:rotateY(180deg)}
.fc-face{grid-area:1/1;position:relative;min-height:320px;backface-visibility:hidden;-webkit-backface-visibility:hidden;border:1px solid var(--line);border-radius:20px;background:var(--surface);padding:22px 20px 18px;display:flex;flex-direction:column;gap:14px;box-shadow:var(--shadow-1)}
.fc-back{transform:rotateY(180deg)}
.fc-face .grow{flex:1;display:flex;flex-direction:column;justify-content:center;gap:14px}
.fc-q{font-size:22px;line-height:1.35;font-weight:500;letter-spacing:-.01em}
.fc-a{font-size:17px;line-height:1.6}
.fc-top{display:flex;justify-content:space-between;align-items:center;gap:10px}
.fc-mover{position:relative;will-change:transform}
.fc-mover.anim{transition:transform .28s ease-out,opacity .28s ease-out}
.fc-stamp{position:absolute;top:18px;z-index:3;padding:6px 12px;border-radius:999px;font-weight:600;font-size:13px;letter-spacing:.04em;text-transform:uppercase;opacity:0;pointer-events:none;border:2px solid currentColor;background:var(--surface)}
.fc-stamp.ok{right:18px;color:var(--ok)}
.fc-stamp.ko{left:18px;color:var(--warn)}
.fc-btns{display:flex;gap:10px}
.fc-btns .btn{flex:1;min-height:52px;justify-content:center;font-size:15px}
.btn.again{color:var(--warn)}
.btn.knew{background:var(--ok);color:#FFFFFF;border-color:transparent}
:root[data-theme="dark"] .btn.knew{color:#0E1F12}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .btn.knew{color:#0E1F12}}
.fc-help{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.fc-help span{display:inline-flex;gap:6px;align-items:center}
.fc-help .touch{display:none}
@media (hover:none) and (pointer:coarse){ .fc-help .keys{display:none} .fc-help .touch{display:inline-flex} }

/* ---------- Modales & lecteur PDF ---------- */
.modal{position:fixed;inset:0;z-index:50;background:rgba(26,25,22,.55);display:flex;align-items:center;justify-content:center;padding:max(16px,env(safe-area-inset-top,0px)) max(16px,env(safe-area-inset-right,0px)) max(16px,env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px))}
.sheet{background:var(--surface);border-radius:var(--r-card);box-shadow:var(--shadow-2);width:min(920px,100%);max-height:100%;display:flex;flex-direction:column;overflow:hidden}
.sheet.tall{height:100%}
.sheet-h{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.sheet-b{padding:18px;overflow:auto;display:flex;flex-direction:column;gap:12px}
.pdfstage{position:relative;background:var(--surface-2);overflow:auto;flex:1;min-height:300px;overscroll-behavior:contain}
.pdf-pages{display:flex;flex-direction:column;align-items:center;gap:14px;padding:16px 12px 84px}
.pdf-page{position:relative;background:#FFFFFF;box-shadow:var(--shadow-1);border-radius:4px;flex:none}
.pdf-page canvas{display:block;width:100%;height:100%;border-radius:4px}
.pdf-page .pg{position:absolute;bottom:-20px;left:0;right:0;text-align:center;font-size:11px;color:var(--muted)}
.pdf-bar{position:absolute;left:50%;bottom:16px;transform:translateX(-50%);width:max-content;max-width:calc(100% - 24px);display:flex;align-items:center;gap:4px;padding:5px;border-radius:999px;background:color-mix(in srgb,var(--ink) 92%,transparent);color:var(--bg);box-shadow:var(--shadow-2);z-index:2}
.pdf-bar button{width:38px;height:38px;border:0;border-radius:50%;background:transparent;color:inherit;display:flex;align-items:center;justify-content:center}
.pdf-bar button:hover{background:rgba(255,255,255,.12)}
.pdf-bar button:disabled{opacity:.35}
.pdf-bar .count{font-family:var(--mono);font-size:13px;padding:0 8px;font-variant-numeric:tabular-nums;white-space:nowrap}
.pdf-bar .sep{width:1px;height:20px;background:rgba(255,255,255,.2);margin:0 2px}
.iconbtn{width:38px;height:38px;border-radius:var(--r-btn);border:1px solid var(--line-2);background:var(--surface);display:inline-flex;align-items:center;justify-content:center;color:var(--ink)}
.iconbtn:hover{background:var(--hover)}
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(24px + var(--tabbar-h) + env(safe-area-inset-bottom,0px));background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:12px;font-size:14px;z-index:60;box-shadow:var(--shadow-2);display:flex;gap:12px;align-items:center}
.toast button{background:none;border:0;color:inherit;font-weight:600;text-decoration:underline;padding:0}
textarea.report{width:100%;min-height:90px;border:1px solid var(--line-2);border-radius:var(--r-input);padding:10px;background:var(--surface);resize:vertical}

/* Bienvenue + réglages IA */
.field{display:flex;flex-direction:column;gap:6px}
.field input{min-height:46px;border:1px solid var(--line-2);border-radius:var(--r-input);padding:0 14px;background:var(--surface);font-size:15px}
.field input:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:transparent}
.ai-state{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-2)}
.ai-state i{width:8px;height:8px;border-radius:50%;background:var(--line-2);flex:none}
.ai-state.on i{background:var(--ok)}
.ai-state.off i{background:var(--warn)}
.engine{border:1px solid var(--line);border-radius:var(--r-input);padding:14px 16px;display:flex;flex-direction:column;gap:10px}
.engine[aria-current="true"]{border-color:var(--accent);background:var(--accent-soft)}
.engine h3{font-size:15px}
.engine p{margin:0;font-size:14px;color:var(--ink-2)}

/* Maths (KaTeX) */
.katex{font-size:1.08em}
.formula .katex{font-size:1.18em}
.katex-display{margin:.2em 0;overflow-x:auto;overflow-y:hidden;padding:2px 0}
.math-u{font-family:var(--math);font-size:1.05em}

/* ---------- Languettes (énoncé / correction) ---------- */
.fold{border-top:1px solid var(--line)}
.fold>summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:10px;padding:10px 2px;font-size:13px;font-weight:500;color:var(--ink-2);user-select:none}
.fold>summary::-webkit-details-marker{display:none}
.fold>summary:hover{color:var(--ink)}
.fold-t{letter-spacing:.02em}
.fold .chev{margin-left:auto;width:7px;height:7px;border-right:1.8px solid currentColor;border-bottom:1.8px solid currentColor;transform:rotate(45deg);transition:transform .18s;opacity:.7}
.fold[open]>summary .chev{transform:rotate(-135deg)}
.fold-b{padding-bottom:10px}
.exo .fold+.fold{margin-top:-2px}
.donebtn{display:inline-flex;align-items:center;gap:6px;min-height:30px;padding:0 10px;border-radius:999px;border:1px solid var(--line-2);background:var(--surface);font-size:12px;color:var(--muted);flex:none}
.donebtn .icon{width:14px;height:14px}
.donebtn[aria-pressed="true"]{background:var(--ok-soft);border-color:transparent;color:var(--ok);font-weight:500}
.exo.is-done{background:color-mix(in srgb,var(--ok-soft) 35%,var(--surface))}
.exo.is-done h3::after{content:' ✓';color:var(--ok)}
.jump button.is-done{background:var(--ok-soft);color:var(--ok);border-color:transparent}
.cnt{font-size:11px;opacity:.8}

/* ---------- Réponses de l'IA en Markdown ---------- */
.md{display:flex;flex-direction:column;gap:10px;min-width:0}
.md>*{margin:0}
.md h1,.md h2{font-size:15.5px;font-weight:600;margin-top:6px}
.md h3{font-size:14.5px;font-weight:600;margin-top:4px}
.md h4{font-size:13.5px;font-weight:600}
.md ul,.md ol{padding-left:1.3em;display:flex;flex-direction:column;gap:4px}
.md li>p{margin:0}
.md li::marker{color:var(--muted)}
.md strong{font-weight:600;color:var(--ink)}
.md code{font-family:var(--mono);font-size:.9em;background:var(--code);border:1px solid var(--line);border-radius:5px;padding:0 4px}
.md pre{background:var(--code);border:1px solid var(--line);border-radius:10px;padding:10px 12px;overflow-x:auto}
.md pre code{border:0;padding:0;background:none}
.md hr{border:0;border-top:1px solid var(--line);margin:4px 0}
.md .katex-display{background:var(--code);border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin:2px 0}
.md blockquote{margin:0;border-left:3px solid var(--accent);background:var(--accent-soft);padding:9px 13px;border-radius:0 10px 10px 0}
.md blockquote.warn{border-left-color:var(--warn);background:var(--warn-soft)}
.md blockquote p{margin:0}
.md .tbl{overflow-x:auto;border:1px solid var(--line);border-radius:10px}
.md table{border-collapse:collapse;width:100%;font-size:.95em}
.md th,.md td{padding:7px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.md th{background:var(--surface-2);font-weight:600}
.md tr:last-child td{border-bottom:0}

/* ---------- Densité : site nettement moins « zoomé » ---------- */
body{font-size:13px;line-height:1.5}
.wrap{max-width:1140px}
.uvhead{padding-top:16px}
.uvhead .wrap{gap:12px}
.uvtop h1{font-size:20px}
.uvtop .muted{font-size:12px!important}
.page{padding-top:16px}
.stack{gap:12px}
.cols{gap:14px}
.card{padding:13px 15px;gap:10px;border-radius:12px}
.card h2{font-size:14.5px}
.resume{padding:12px 15px}
.tile{width:36px;height:36px;border-radius:10px}
.btn{min-height:32px;padding:0 11px;font-size:12.5px;border-radius:8px}
.btn.small{min-height:28px;padding:0 9px;font-size:12px}
.chip{min-height:28px;padding:3px 10px;font-size:12px}
.chip .icon,.btn .icon{width:14px;height:14px}
.row{padding:7px 0;font-size:13px}
.pill{font-size:11px;padding:2px 8px}
.tabs button{padding:7px 10px;font-size:12.5px}
#side{flex-basis:212px;padding:14px 12px;gap:16px}
.brand-mark{width:28px;height:28px}
.brand-name{font-size:15px}
.nav button{min-height:32px;padding:5px 9px;font-size:12.5px}
.nav button .icon{width:16px;height:16px}
.uv-link{padding:7px 10px;font-size:13px}
.side-res{font-size:12px}
.exo{padding:11px 13px;gap:4px;border-radius:12px}
.exo-h h3{font-size:14px}
.fold>summary{padding:7px 2px;font-size:12px}
.chap{border-radius:12px}
.chap>summary{padding:9px 13px;font-size:13px}
.chap-body{padding:10px 13px 13px;gap:10px}
.sec{padding:6px 0;font-size:12.5px}
.jump button{min-height:28px;min-width:34px;font-size:12px}
/* chat */
.chathead{padding-block:8px}
#thread{padding-top:18px;padding-bottom:18px;gap:16px;max-width:860px}
.q{font-size:13px;padding:8px 12px;border-radius:12px 12px 4px 12px}
.ans{font-size:13.5px;line-height:1.6;gap:10px}
.ans h3{font-size:16px}
.badge{font-size:11px;padding:2px 8px}
.formula{font-size:14px;padding:10px 12px}
.steps{gap:10px}
.step-n{width:22px;height:22px;font-size:11px}
.composer{padding-top:10px;padding-bottom:calc(12px + env(safe-area-inset-bottom,0px))}
.composer .wrap{max-width:820px}
.inputbox{border-radius:14px;padding:5px 5px 5px 8px}
.inputbox textarea{font-size:13.5px;padding:6px 4px}
.send{width:34px;height:34px}
.ctxchip{font-size:12px}
.empty{gap:12px;padding:10px 0}
.empty h2{font-size:19px}
.seg button{min-height:28px;padding:4px 10px;font-size:12px}
.seg{border-radius:8px}
/* mode guidé */
.g-head{padding:11px 14px 10px;gap:7px}
.g-top span[style*="font-size:16px"]{font-size:14px!important}
.g-body{padding:12px 14px;gap:9px}
.bubble{padding:11px 13px;font-size:13.5px;border-radius:12px;gap:8px}
.choice{min-height:38px;padding:8px 11px;font-size:13.5px;border-radius:10px}
.choice .k{width:20px;height:20px;font-size:11px}
.valrow input{font-size:13.5px;padding:6px}
.exo-box{padding:9px 12px;border-radius:12px}
/* flashcards */
.fc-wrap{max-width:500px;gap:10px}
.fc-q{font-size:17px}
.fc-a{font-size:14px}
.fc-face{min-height:270px;padding:18px 16px 14px}
.fc-btns .btn{min-height:42px;font-size:13.5px}
/* modales */
.sheet-h{padding:9px 13px}
.sheet-b{padding:13px;gap:10px}
.iconbtn{width:32px;height:32px}

/* ---------- Téléphone : barre d'onglets en bas ---------- */
@media (max-width:899px){
  :root{--tabbar-h:calc(62px + env(safe-area-inset-bottom,0px))}
  #app{flex-direction:column}
  /* pas de backdrop-filter ici : il « capturerait » la barre d'onglets position:fixed */
  #side{flex:none;height:auto;position:sticky;top:0;z-index:20;padding:10px max(16px,env(safe-area-inset-right,0px)) 10px max(16px,env(safe-area-inset-left,0px));gap:0;border-right:0;border-bottom:1px solid var(--line);background:var(--bg);overflow:visible}
  .brand-sub{display:none}
  .hide-m{display:none!important}
  .nav{position:fixed;left:0;right:0;bottom:0;z-index:30;flex-direction:row;justify-content:space-around;gap:0;padding:6px 4px env(safe-area-inset-bottom,0px);background:color-mix(in srgb,var(--surface) 94%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-top:1px solid var(--line);height:var(--tabbar-h)}
  .nav button{flex:1;flex-direction:column;gap:3px;padding:6px 2px;min-height:50px;font-size:11px;border-radius:10px;justify-content:center;color:var(--muted)}
  .nav button .icon{width:22px;height:22px}
  .nav button[aria-current="page"]{background:transparent;color:var(--accent)}
  .nav button[aria-current="page"] .icon{color:var(--accent)}
  .nav .long{display:none}
  .nav .short{display:inline}
  .nav button.show-m{display:none!important}
  .me{margin-top:0;padding-top:0;border-top:0}
  .me .me-txt{display:none}
  #main{min-height:0}
  :root{--tabbar-h:calc(54px + env(safe-area-inset-bottom,0px))}
  #side{padding-top:7px;padding-bottom:7px}
  .nav button{min-height:44px;font-size:10px;gap:2px;padding:4px 2px}
  .nav button .icon{width:20px;height:20px}
  .uvhead,.page,#thread,.composer,.chathead{padding-left:max(12px,env(safe-area-inset-left,0px))!important;padding-right:max(12px,env(safe-area-inset-right,0px))!important}
  .uvhead{padding-top:12px}
  .uvtop h1{font-size:18px}
  .uvtop .actions{display:none}
  .chathead{position:sticky;top:43px;padding-block:7px}
  .page{padding-top:12px}
  .fc-card{min-height:min(52vh,380px)}
  .modal{padding:0}
  .sheet{border-radius:0;width:100%;height:100%;max-height:none}
  .empty h2{font-size:18px}
  .ans{font-size:13.5px}
  .chips.scroll{margin-inline:-12px!important;padding-inline:12px!important}
  #main[data-view="flashcards"] .uvhead{display:none}
  .chips.scroll{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;margin-inline:-20px;padding-inline:20px;scroll-padding-inline:20px}
  .chips.scroll::-webkit-scrollbar{display:none}
  .chips.scroll .chip{flex:none}
  .page .stack{gap:12px}
}
@media (min-width:900px){.show-m{display:none!important}}
@media (prefers-reduced-motion: reduce){ .dots i{animation:none;opacity:.7} .fc-card,.fc-mover.anim,.bar>i{transition:none} }