:root{
  --bg:#f6f5f2; --card:#fff; --ink:#22211f; --muted:#8a877f; --line:#e4e1da;
  --accent:#5b5bd6; --accent-soft:#ededfb; --danger:#c0392b; --ok:#1e8e5a;
  --radius:14px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font:16px/1.55 -apple-system,"Segoe UI",Roboto,"PT Sans",sans-serif;background:var(--bg);color:var(--ink);-webkit-text-size-adjust:100%}
button{font:inherit;cursor:pointer;border:0;border-radius:10px;padding:.55em 1em;background:var(--accent);color:#fff}
button.ghost{background:transparent;color:var(--accent);border:1px solid var(--line)}
button.danger{background:var(--danger)}
button.small{padding:.3em .7em;font-size:.85em}
button:disabled{opacity:.45;cursor:default}
input,textarea{font:inherit;padding:.6em .8em;border:1px solid var(--line);border-radius:10px;width:100%;background:#fff}
a{color:var(--accent)}
h1,h2,h3{line-height:1.25}

/* top bar */
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:10px;padding:10px 16px;height:41px;background:var(--card);border-bottom:1px solid var(--line)}
.topbar .logo{font-weight:700;font-size:1.05em}
.topbar .spacer{flex:1}

/* layout */
.wrap{max-width:860px;margin:0 auto;padding:16px 16px 96px;overflow-wrap:anywhere}
.editor,.pre,.msg{overflow-wrap:anywhere;word-break:break-word}

/* login */
.login{max-width:340px;margin:15vh auto;background:var(--card);padding:28px;border-radius:var(--radius);border:1px solid var(--line)}
.login h1{font-size:1.3em;margin:0 0 16px}
.login button{width:100%;margin-top:12px}

/* lecture cards */
.lec-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin-top:14px}
.lec-card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;text-decoration:none;color:inherit;display:block}
.lec-card .del{position:absolute;top:8px;right:8px;background:none;border:none;font-size:.9em;opacity:.4;cursor:pointer;padding:4px}
.lec-card .del:hover{opacity:1}
.lec-card:hover{border-color:var(--accent)}
.lec-card .num{color:var(--muted);font-size:.8em}
.lec-card h3{margin:.2em 0 .6em;font-size:1.05em}
.pills{display:flex;flex-wrap:wrap;gap:5px}
.pill{font-size:.72em;padding:.25em .6em;border-radius:999px;background:#efedе8;background:#efece6;color:var(--muted)}
.pill.on{background:var(--accent-soft);color:var(--accent);font-weight:600}
.pill.done{background:#e2f3ea;color:var(--ok)}

/* wizard */
.modal-bg{position:fixed;inset:0;background:rgba(0,0,0,.35);z-index:50;display:flex;align-items:center;justify-content:center;padding:16px}
.modal{background:var(--card);border-radius:var(--radius);padding:22px;max-width:420px;width:100%}
.modal label{display:block;font-size:.85em;color:var(--muted);margin:10px 0 4px}
.modal .row{display:flex;gap:8px;justify-content:flex-end;margin-top:16px}

/* workspace */
.ws-head{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.ws-head h2{margin:0;font-size:1.2em}
.tabs{display:flex;gap:4px;margin:14px 0;border-bottom:1px solid var(--line);overflow-x:auto}
@media (min-width:721px){
  .tabs{position:sticky;top:41px;z-index:15;background:var(--bg);margin-bottom:0;padding-top:6px}
  .toolbar{top:calc(41px + 51px)}
}
.tabs button{background:none;color:var(--muted);border-radius:8px 8px 0 0;padding:.6em .9em;white-space:nowrap}
.tabs button.on{color:var(--accent);box-shadow:inset 0 -2px 0 var(--accent);font-weight:600}
.lock-banner{background:#fff4e0;border:1px solid #f0d9a8;color:#8a6d1f;padding:10px 14px;border-radius:10px;margin-bottom:12px}

/* editor */
.toolbar{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px;position:sticky;top:52px;background:var(--bg);padding:6px 0;z-index:10}
.editor{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;min-height:40vh}
.editor [contenteditable]{outline:none}
.editor .blk{margin:0 0 .55em;border-radius:6px;padding:2px 4px}
.editor .blk:focus{background:#fafaf7}
.editor h1.blk{font-size:1.5em}
.editor h2.blk{font-size:1.25em;margin-top:1em}
.editor h3.blk{font-size:1.1em;margin-top:.9em}
.editor ul.blk,.editor ol.blk{padding-left:1.4em}
.editor blockquote.blk{border-left:3px solid var(--line);padding-left:12px;color:#555}
.editor .raw{font-family:ui-monospace,monospace;font-size:.85em;color:var(--muted);white-space:pre-wrap}
.savebar{display:flex;gap:8px;align-items:center;margin-top:12px}
.dirty{color:var(--danger);font-size:.85em}
.saved{color:var(--ok);font-size:85%;font-size:.85em}


.slide-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.slide-head{display:flex;align-items:center;gap:8px;padding:8px 12px;background:#fafaf7;border-bottom:1px solid var(--line);font-size:.85em;color:var(--muted)}
.slide-head .ord{display:flex;gap:4px}
.slide-head button{padding:.2em .5em;font-size:.8em}
.slide-body{padding:16px 18px;min-height:90px}
.slide-body .s-title{font-size:1.2em;font-weight:700;margin-bottom:.4em;outline:none}
.slide-body .s-text{outline:none;white-space:pre-wrap;margin-bottom:.5em}
.slide-body .s-note{background:#fbf7e8;border-radius:8px;padding:8px 10px;font-size:.85em;color:#7a6a2a;outline:none;margin-top:6px}
.slide-body img{max-width:100%;border-radius:8px}
.slide-body .imgrow{display:flex;gap:8px;align-items:center;margin:6px 0}
.slide-actions{display:flex;gap:8px;padding:8px 12px;border-top:1px dashed var(--line)}

/* chat */
.chat{display:flex;flex-direction:column;gap:12px;padding-bottom:76px}
.msg{max-width:88%;padding:10px 14px;border-radius:14px;white-space:pre-wrap;word-break:break-word}
.msg.user{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:4px}
.msg.assistant{align-self:flex-start;background:var(--card);border:1px solid var(--line);border-bottom-left-radius:4px}
.msg .sel{display:block;font-size:.8em;opacity:.75;border-left:3px solid rgba(255,255,255,.5);padding-left:8px;margin-bottom:6px}
.msg.assistant .sel{border-color:var(--line);color:var(--muted)}
.msg.agent{border-left:3px solid var(--accent)}
.msg-acts{display:flex;gap:4px;justify-content:flex-end;opacity:.35;margin-top:4px}
.msg-acts:hover{opacity:1}
.msg-acts button{padding:.15em .45em;font-size:.85em}
.jrow{display:flex;gap:8px;align-items:center;font-size:.82em;color:var(--muted);padding:3px 0}
.jst{font-weight:600;text-transform:uppercase;font-size:.85em}
.jst.running{color:var(--accent)}.jst.done{color:#15803d}.jst.error,.jst.cancelled{color:#b91c1c}.jst.queued{color:var(--muted)}
.jnote{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.edit-card{border:1px solid var(--line);border-radius:10px;margin:10px 0;overflow:hidden;font-size:.9em}
.edit-card .ec-file{background:#f1efe9;padding:5px 10px;font-size:.8em;color:var(--muted)}
.edit-card .ec-old{background:#fdeceb;padding:8px 10px;white-space:pre-wrap;color:#8b2318}
.edit-card .ec-new{background:#e8f6ee;padding:8px 10px;white-space:pre-wrap;color:#14532d}
.edit-card .ec-btns{display:flex;gap:8px;padding:8px 10px}
.chat-input{display:flex;gap:8px;align-items:flex-end;position:fixed;left:50%;transform:translateX(-50%);width:min(860px,100%);bottom:0;background:var(--bg);padding:8px 16px;z-index:25;border-top:1px solid var(--line)}
.chat-input textarea{flex:1;min-height:40px;max-height:124px;resize:none;overflow-y:hidden}
.chat-input button{align-self:flex-end;display:flex;align-items:center;justify-content:center;width:40px;height:40px;padding:0}
.chat-input button svg{display:block}

/* sources view */
.pre{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;white-space:pre-wrap;font-family:inherit}
.pre.docview{white-space:normal;line-height:1.55}
.pre.docview h1,.pre.docview h2,.pre.docview h3{margin:.9em 0 .3em}
.pre.docview a{color:var(--accent)}

/* bottom nav (mobile) */
.bottomnav{display:none}
@media (max-width:720px){
  .wrap{padding:12px 12px 120px}
  .tabs{display:none}
  .bottomnav{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:30;background:var(--card);border-top:1px solid var(--line);height:calc(48px + env(safe-area-inset-bottom));padding:4px 2px calc(4px + env(safe-area-inset-bottom))}
  .bottomnav button{flex:1 1 0;min-width:0;background:none;color:var(--muted);font-size:.68em;padding:.55em .1em;border-radius:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .chat-input{bottom:calc(48px + env(safe-area-inset-bottom))}
  .bottomnav button.on{color:var(--accent);font-weight:600;background:var(--accent-soft)}
  .editor{padding:14px}
  .toolbar{top:49px}
  .msg{max-width:95%}
}
.dot{display:none;width:7px;height:7px;border-radius:50%;background:var(--danger);margin-left:5px;vertical-align:super}
.dot.show{display:inline-block}

/* ============ slide canvas — 1280x720 scaled ============ */
.slbar{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.slbar select{font:inherit;padding:.3em .5em;border:1px solid var(--line);border-radius:8px;background:var(--card)}
.slgrid{display:flex;flex-direction:column;gap:14px}
.slpanel{position:relative;border:1px solid var(--line);border-radius:12px;overflow:hidden;cursor:zoom-in;background:#fff}
.slframe{aspect-ratio:16/9;position:relative;overflow:hidden}
.slcanvas{position:absolute;left:0;top:0;width:1280px;height:720px;transform-origin:0 0;
  background:var(--sbg,#fff);color:var(--sfg,#1a1a1a);font-family:var(--sfont,'Segoe UI',system-ui,sans-serif);
  display:flex;flex-direction:column;padding:56px 72px 48px;box-sizing:border-box}
.sl-head{flex:0 0 auto;min-height:64px;margin-bottom:14px}
.sl-title{font-size:42px;font-weight:600;line-height:1.15;color:var(--saccent,#0b5cad)}
.t-titleline .sl-title{border-bottom:2px solid var(--saccent);padding-bottom:8px}
.slcanvas.t-title{justify-content:center;text-align:center}
.slcanvas.t-title .sl-title{font-size:56px}
.sl-body{flex:1;overflow:hidden;font-size:32px;line-height:1.4}
.sl-body h1,.sl-body h2,.sl-body h3{color:var(--saccent);margin:.15em 0;line-height:1.2}
.sl-body h1{font-size:1.5em}.sl-body h2{font-size:1.3em}.sl-body h3{font-size:1.1em}
.sl-body p{margin:.25em 0}
.sl-body ul,.sl-body ol{padding-left:1.3em;margin:.2em 0}
.sl-body li{margin:.12em 0}
.sl-body strong{color:var(--saccent)}
.sl-body blockquote{border-left:6px solid var(--squote);padding-left:.7em;color:var(--smut);margin:.3em 0;font-style:italic}
.sl-body pre.raw,.sl-body .raw{font-size:.75em;background:var(--scode);padding:.6em .8em;border-radius:10px;white-space:pre-wrap;overflow:hidden}
.sl-body img,.sl-body .imgs img,.sl-body .simg{max-width:100%;max-height:55%;object-fit:contain;display:block;margin:.2em auto}
.sl-body .hblk svg{max-width:100%;max-height:60%;display:block;margin:0 auto}
.sl-body table{border-collapse:collapse;font-size:.8em}
.sl-body th{background:var(--scode);padding:.2em .6em}
.sl-body td{padding:.15em .6em;border:1px solid var(--scode)}
.sl-page{position:absolute;right:20px;bottom:12px;font-size:16px;color:var(--smut)}
.cap{display:block;font-size:.6em;color:var(--smut)}

/* modal: canvas view + edit pane */
.slmodal{position:fixed;inset:0;z-index:60;background:rgba(0,0,0,.55);display:flex;align-items:center;justify-content:center;padding:10px}
.slmodal-in{background:var(--card);border-radius:14px;width:100%;max-width:960px;max-height:94vh;display:flex;flex-direction:column;overflow:hidden}
.slmodal-bar{display:flex;align-items:center;gap:8px;padding:8px 12px;border-bottom:1px solid var(--line);color:var(--muted);font-size:.85em}
.slmodal-bar span:first-child{flex:1}
.slmodal-view{display:flex;align-items:stretch;gap:6px;padding:10px}
.slmodal-view .slframe{flex:1;border:1px solid var(--line);border-radius:10px;min-width:0}
.slmodal-view>button{align-self:center;flex:0 0 auto;font-size:1.4em;padding:.4em .55em}
.sledit{overflow-y:auto;padding:8px 14px;max-height:38vh;border-top:1px dashed var(--line)}
.sledit .s-title{font-weight:700;font-size:1.1em;outline:none;margin-bottom:8px}
.sledit .s-title:empty:before{content:attr(data-ph);color:var(--muted)}
.sblk{position:relative;padding-right:52px;margin:.3em 0}
.sblk .ed{outline:none;white-space:pre-wrap;line-height:1.35}
.sblk.is-note .ed{background:#fbf7e8;border-radius:8px;padding:6px 10px;font-size:.85em;color:#7a6a2a}
.sblk img{max-height:120px;border-radius:8px}
.sblk .bctl{position:absolute;right:0;top:0;display:flex;flex-direction:column;gap:2px}
.sblk .bctl button{background:var(--card);border:1px solid var(--line);border-radius:6px;color:var(--muted);font-size:.75em;padding:1px 6px;cursor:pointer;line-height:1.2}
.s-add{display:flex;gap:6px;margin:.6em 0;justify-content:center}
.slnotes{border-top:1px solid var(--line);padding:10px 14px;font-size:.85em;color:var(--muted);white-space:pre-wrap;max-height:25vh;overflow-y:auto}
.slstatus{min-height:22px;padding:0 14px 8px;font-size:.8em;color:var(--muted)}
.imgs img{max-width:100%;border-radius:8px}
.msg .imgs img,.msg img{max-width:min(300px,100%);display:block;margin:.3em 0}
@media (max-width:640px){.slmodal-view>button{position:absolute;bottom:6px;z-index:3;background:var(--card);border-radius:8px}.slmodal-view>button:first-child{left:14px}.slmodal-view>button:last-child{right:14px}.slmodal-view{position:relative}}

/* autofit inner + overflow badge + tables */
.sl-fit{transform-origin:0 0;display:grid;grid-template-columns:repeat(12,1fr);gap:18px;align-content:start}
.sl-fit>*{grid-column:span 12;min-width:0}
.sl-cell img{max-height:440px}
.sl-over{position:absolute;left:12px;bottom:8px;font-size:14px;color:#b3541e;background:rgba(255,244,230,.92);border:1px solid #f0d0a8;border-radius:6px;padding:1px 8px}
.sl-body table{border-collapse:collapse;font-size:.72em;width:100%}
.sl-body th{background:var(--scode);padding:.25em .55em;text-align:left}
.sl-body td{padding:.2em .55em;border:1px solid var(--scode)}
.chat table,.wrap table{border-collapse:collapse;font-size:.9em}
.chat th,.chat td,.wrap th,.wrap td{border:1px solid var(--line);padding:.3em .6em;text-align:left}
.chat th,.wrap th{background:var(--accent-soft)}


/* presenter view */
.present{min-height:100vh;display:flex;flex-direction:column;background:#111;color:#eee;padding:10px}
.present .slframe{border:1px solid #333;border-radius:10px;overflow:hidden}
.pnotes{flex:1;padding:14px 4px;font-size:1.15em;line-height:1.5;white-space:pre-wrap}
.pnav{display:flex;align-items:center;gap:10px;padding:8px 0;color:#999;font-size:.9em}
.pnav button{background:#222;color:#eee;padding:.4em .9em;font-size:1.2em}
.pnav span{flex:1;text-align:center}
.pnav a{color:#999;text-decoration:none;padding:.4em}