:root{
  --paper:#f3ede1; --paper-2:#ece3d3; --card:#fbf8f1; --ink:#23241f; --ink-soft:#5b5a4f;
  --line:#d9cfbb; --accent:#b5430f; --accent-deep:#7c2d0a; --green:#2f5d3a; --red:#9b2c2c; --gold:#a87a1e;
  --shadow:0 18px 40px -20px rgba(40,30,15,.45); --radius:16px;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
html,body{margin:0;padding:0;height:100%}
body{
  font-family:"Hanken Grotesk",system-ui,sans-serif;color:var(--ink);line-height:1.55;
  background:radial-gradient(1100px 560px at 88% -10%,#fff6e6 0,transparent 55%),var(--paper);
  display:flex;flex-direction:column;min-height:100vh;
}
.grain{position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");}

/* header */
.topbar{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;
  gap:16px;flex-wrap:wrap;padding:16px 22px;border-bottom:1px solid var(--line);background:rgba(251,248,241,.7);backdrop-filter:blur(6px)}
.brand{display:flex;align-items:center;gap:14px}
.mark{font-family:"Fraunces",serif;font-weight:600;font-size:24px;width:46px;height:46px;border-radius:12px;
  display:grid;place-items:center;color:#fff;background:linear-gradient(150deg,var(--accent),var(--accent-deep));box-shadow:var(--shadow)}
h1{font-family:"Fraunces",serif;font-weight:600;font-size:23px;margin:0;letter-spacing:-.4px}
.sub{margin:1px 0 0;color:var(--ink-soft);font-size:13px}
.nav{display:flex;align-items:center;gap:14px;font-size:14px}
.nav a{color:var(--ink-soft);text-decoration:none;padding:6px 12px;border-radius:999px;border:1px solid transparent}
.nav a.active,.nav a:hover{color:var(--accent-deep);border-color:var(--line);background:var(--card)}
.engine{font-size:12px;color:var(--ink-soft);background:var(--card);border:1px solid var(--line);padding:6px 11px;border-radius:999px}
.engine strong{color:var(--accent-deep)}

/* workspace */
.workspace{position:relative;z-index:1;flex:1;display:grid;grid-template-columns:288px 1fr 320px;gap:14px;
  padding:14px 18px;max-width:1500px;width:100%;margin:0 auto;min-height:0}
.pane{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  display:flex;flex-direction:column;min-height:0;overflow:hidden}
.pane-head{display:flex;align-items:center;justify-content:space-between;padding:15px 16px 10px}
.pane-head h2{font-family:"Fraunces",serif;font-size:14px;letter-spacing:.05em;text-transform:uppercase;color:var(--accent-deep);margin:0}
.mini{font-family:inherit;font-size:13px;border:1px solid var(--line);background:var(--paper-2);color:var(--ink);
  padding:6px 11px;border-radius:9px;cursor:pointer;transition:.14s}
.mini:hover{border-color:var(--accent)}
.mini.ghost{background:none}

/* sources */
.field-sm{display:flex;flex-direction:column;gap:5px;font-size:12px;color:var(--ink-soft);padding:0 16px 8px}
.field-sm input{font-family:inherit;font-size:14px;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:9px;padding:8px 10px}
.source-list{flex:1;overflow:auto;padding:4px 12px 8px}
.source-list .empty,.note-list .empty{color:var(--ink-soft);font-size:13px;padding:8px 6px;line-height:1.5}
.src-item{display:flex;align-items:flex-start;gap:9px;background:var(--paper-2);border:1px solid var(--line);
  border-radius:11px;padding:9px 11px;margin-bottom:8px;transition:.14s}
.src-item.hl{border-color:var(--accent);box-shadow:0 0 0 3px rgba(181,67,15,.12)}
.src-item input[type=checkbox]{margin-top:3px;accent-color:var(--accent)}
.src-item .si-body{min-width:0;flex:1}
.src-item .si-name{font-size:13.5px;font-weight:600;word-break:break-word}
.src-item .si-meta{font-size:11.5px;color:var(--ink-soft)}
.src-item .si-rm{border:none;background:none;color:var(--red);cursor:pointer;font-size:16px;line-height:1}
.src-actions{padding:8px 16px 14px;border-top:1px solid var(--line)}
.chk-all{font-size:12.5px;color:var(--ink-soft);display:flex;gap:7px;align-items:center;cursor:pointer}
.chk-all input{accent-color:var(--accent)}

/* chat */
.chat{position:relative}
.chat-stream{flex:1;overflow:auto;padding:20px 22px;display:flex;flex-direction:column;gap:16px}
.welcome{margin:auto;text-align:center;max-width:440px;color:var(--ink-soft)}
.wmark{font-size:26px;width:56px;height:56px;border-radius:50%;display:grid;place-items:center;margin:0 auto 12px;
  color:var(--accent);background:#fff;border:1px solid var(--line)}
.welcome h3{font-family:"Fraunces",serif;color:var(--ink);font-size:22px;margin:0 0 8px}
.starters{display:flex;flex-direction:column;gap:8px;margin-top:16px}
.chip{font-family:inherit;font-size:13.5px;text-align:left;background:var(--paper-2);border:1px solid var(--line);
  color:var(--ink);border-radius:11px;padding:10px 13px;cursor:pointer;transition:.14s}
.chip:hover{border-color:var(--accent);background:#f7ecdc}

.msg{display:flex;gap:11px;max-width:100%}
.msg .av{flex:none;width:30px;height:30px;border-radius:9px;display:grid;place-items:center;font-size:14px;font-weight:700}
.msg.user .av{background:var(--ink);color:#fff}
.msg.ai .av{background:linear-gradient(150deg,var(--accent),var(--accent-deep));color:#fff;font-family:"Fraunces",serif}
.msg .bubble{background:var(--card);border:1px solid var(--line);border-radius:13px;padding:13px 15px;font-size:15px;min-width:0}
.msg.user .bubble{background:var(--paper-2)}
.msg .bubble.thinking{color:var(--ink-soft);font-style:italic}
.cite{display:inline-block;font-size:11px;font-weight:700;color:#fff;background:var(--accent);
  border-radius:6px;padding:0 6px;margin:0 2px;cursor:pointer;vertical-align:baseline;line-height:1.7}
.cite:hover{background:var(--accent-deep)}
.msg .followups{display:flex;flex-direction:column;gap:6px;margin-top:11px}
.msg .savenote{margin-top:10px}

.composer{display:flex;gap:10px;align-items:flex-end;padding:14px 16px;border-top:1px solid var(--line);background:var(--card)}
.composer textarea{flex:1;resize:none;font-family:inherit;font-size:15px;color:var(--ink);background:#fff;
  border:1px solid var(--line);border-radius:13px;padding:12px 14px;max-height:160px;line-height:1.4}
.composer textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(181,67,15,.12)}
.send{flex:none;width:46px;height:46px;border-radius:12px;border:none;cursor:pointer;font-size:18px;color:#fff;
  background:linear-gradient(150deg,var(--accent),var(--accent-deep));transition:.14s}
.send:hover{transform:translateY(-1px)}
.send:disabled{opacity:.5;cursor:wait;transform:none}

/* studio */
.studio-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px;padding:4px 14px 6px}
.studio-btn{font-family:inherit;font-size:13px;display:flex;flex-direction:column;align-items:flex-start;gap:6px;
  background:var(--paper-2);border:1px solid var(--line);border-radius:12px;padding:12px;cursor:pointer;transition:.14s;color:var(--ink)}
.studio-btn span{font-size:18px}
.studio-btn:hover{border-color:var(--accent);background:#f7ecdc;transform:translateY(-1px)}
.studio-btn:disabled{opacity:.55;cursor:wait}
.note-list{flex:1;overflow:auto;padding:4px 14px 14px}
.note-item{background:var(--paper-2);border:1px solid var(--line);border-radius:11px;padding:10px 12px;margin-bottom:8px;cursor:pointer;transition:.14s}
.note-item:hover{border-color:var(--accent)}
.note-item .nt-title{font-size:13.5px;font-weight:600;word-break:break-word}
.note-item .nt-actions{display:flex;justify-content:flex-end;margin-top:4px}
.note-item .nt-rm{border:none;background:none;color:var(--red);cursor:pointer;font-size:12px}

/* modal */
.modal{position:fixed;inset:0;z-index:10;background:rgba(35,30,20,.42);display:grid;place-items:center;padding:20px}
.modal-card{background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);
  width:min(760px,100%);max-height:86vh;display:flex;flex-direction:column;overflow:hidden}
.modal-card.small{width:min(540px,100%)}
.modal-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 18px;border-bottom:1px solid var(--line)}
.modal-head h3{font-family:"Fraunces",serif;margin:0;font-size:18px}
.modal-actions{display:flex;gap:8px;flex-wrap:wrap}
.modal-body{padding:18px 20px;overflow:auto}
.field-full{width:100%;font-family:inherit;font-size:15px;color:var(--ink);background:#fff;border:1px solid var(--line);
  border-radius:11px;padding:11px 13px;margin-bottom:12px}
.field-full:focus{outline:none;border-color:var(--accent)}
.btn-primary{width:100%;border:none;cursor:pointer;font-family:"Fraunces",serif;font-size:16px;font-weight:600;color:#fff;
  background:linear-gradient(150deg,var(--accent),var(--accent-deep));padding:13px;border-radius:11px}

/* markdown */
.markdown{font-size:15px;line-height:1.65}
.markdown h1,.markdown h2,.markdown h3{font-family:"Fraunces",serif;line-height:1.25;margin:1.1em 0 .4em}
.markdown h1{font-size:24px}.markdown h2{font-size:20px}.markdown h3{font-size:17px}
.markdown p{margin:.5em 0}
.markdown ul,.markdown ol{padding-left:22px;margin:.5em 0}
.markdown li{margin:.2em 0}
.markdown code{background:var(--paper-2);padding:1px 5px;border-radius:5px;font-size:.9em}
.markdown pre{background:var(--paper-2);padding:12px;border-radius:10px;overflow:auto}
.markdown table{border-collapse:collapse;width:100%;margin:.6em 0}
.markdown th,.markdown td{border:1px solid var(--line);padding:7px 10px;text-align:left;font-size:14px}
.markdown blockquote{border-left:3px solid var(--accent);margin:.6em 0;padding:.2em 0 .2em 14px;color:var(--ink-soft)}
.markdown .cite{font-size:11px}

.spinner-sm{display:inline-block;width:15px;height:15px;border-radius:50%;border:3px solid var(--line);
  border-top-color:var(--accent);animation:spin 1s linear infinite;vertical-align:-2px;margin-right:6px}
@keyframes spin{to{transform:rotate(360deg)}}

.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%);z-index:20;background:var(--ink);color:#fff;
  font-size:14px;padding:11px 18px;border-radius:999px;box-shadow:var(--shadow)}

@media(max-width:980px){
  .workspace{grid-template-columns:1fr;height:auto}
  .pane{height:auto;max-height:none}
  .chat{min-height:60vh}
  .source-list,.note-list{max-height:320px}
}

/* ---- super-power additions ---- */
.studio-btn.feat{grid-column:1 / -1;flex-direction:row;align-items:center;color:#fff;
  background:linear-gradient(135deg,var(--accent),var(--accent-deep));border-color:transparent}
.studio-btn.feat span{font-size:20px}
.studio-btn.feat:hover{filter:brightness(1.05)}

/* audio overview */
.audio-wrap audio{width:100%;margin:4px 0 16px}
.audio-note{font-size:13px;color:var(--ink-soft);background:var(--paper-2);border:1px solid var(--line);
  border-radius:10px;padding:10px 12px;margin-bottom:14px}
.transcript .seg{display:flex;gap:10px;margin:0 0 10px}
.transcript .sp{flex:none;font-weight:700;font-size:12px;width:58px;color:var(--accent-deep)}
.transcript .sp.b{color:var(--green)}

/* mind map (collapsible tree) */
.mtree{font-size:14px}
.mtree ul{list-style:none;margin:0;padding-left:18px;border-left:1px dashed var(--line)}
.mtree>ul{border-left:none;padding-left:0}
.mtree li{margin:5px 0}
.mnode{display:inline-flex;align-items:center;gap:7px;background:var(--paper-2);border:1px solid var(--line);
  border-radius:9px;padding:5px 11px;cursor:default}
.mnode.root{background:linear-gradient(135deg,var(--accent),var(--accent-deep));color:#fff;border-color:transparent;font-weight:600;font-family:"Fraunces",serif}
.mnode.has-children{cursor:pointer}
.mnode .tw{font-size:11px;color:var(--ink-soft)}
.mnode.root .tw{color:#fff}
.mtree li.collapsed>ul{display:none}

/* citation passage popover */
.cite-pop{position:fixed;z-index:30;max-width:340px;background:var(--ink);color:#fff;font-size:13px;line-height:1.5;
  padding:11px 13px;border-radius:11px;box-shadow:var(--shadow)}
.cite-pop b{color:#ffd9a8;display:block;margin-bottom:4px;font-size:12px}
.rag-badge{display:inline-block;font-size:10.5px;letter-spacing:.04em;text-transform:uppercase;color:var(--green);
  border:1px solid var(--green);border-radius:6px;padding:1px 6px;margin-left:8px;vertical-align:1px}