@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============================================================
   Design tokens - indigo accent on slate neutrals
   ============================================================ */
:root{
  /* Neutrals */
  --bg:#f8fafc;
  --surface:#ffffff;
  --surface-2:#f1f5f9;
  --line:#e2e8f0;
  --line-strong:#cbd5e1;

  /* Text */
  --text:#0f172a;
  --text-2:#475569;
  --text-3:#94a3b8;

  /* Indigo accent ramp */
  --accent:#5b5bd6;
  --accent-hover:#4f4fc4;
  --accent-soft:#eef2ff;
  --accent-border:#c7d2fe;
  --accent-text:#4338ca;

  /* Feedback */
  --danger:#dc2626;
  --danger-soft:#fef2f2;
  --success:#059669;
  --highlight:#fde68a;
  --highlight-active:#fbbf24;

  /* Shape & depth */
  --r-sm:6px;
  --r-md:9px;
  --r-lg:14px;
  --r-xl:18px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow-md:0 4px 12px rgba(15,23,42,.08);
  --shadow-lg:0 24px 56px rgba(15,23,42,.18);
  --ring:0 0 0 3px rgba(91,91,214,.18);

  --bar-h:60px;
}

*{box-sizing:border-box}
[hidden]{display:none !important}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:'Inter',system-ui,-apple-system,sans-serif;font-size:14px;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
a{color:inherit}
::selection{background:var(--accent-soft);color:var(--accent-text)}

:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* Slim, unobtrusive scrollbars */
*::-webkit-scrollbar{width:10px;height:10px}
*::-webkit-scrollbar-track{background:transparent}
*::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:99px;
  border:3px solid transparent;background-clip:content-box}
*::-webkit-scrollbar-thumb:hover{background:var(--text-3);background-clip:content-box}

.app{height:100vh;display:flex;flex-direction:column;background:var(--surface)}

/* ============================================================
   Top bar
   ============================================================ */
.bar{height:var(--bar-h);flex-shrink:0;border-bottom:1px solid var(--line);background:var(--surface);
  display:flex;align-items:center;justify-content:space-between;padding:0 18px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:14.5px;letter-spacing:-.2px}
.brand b{color:var(--accent);font-weight:600}
.brand-mark{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;flex-shrink:0;
  background:linear-gradient(135deg,var(--accent),#7c7cf0);color:#fff;font-size:13px;
  box-shadow:var(--shadow-sm)}
.avatar{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;flex-shrink:0;
  background:var(--accent-soft);color:var(--accent-text);font-size:12px;border:1px solid var(--accent-border)}
.bar-right{display:flex;align-items:center;gap:10px}

.status-pill{display:inline-flex;align-items:center;gap:7px;background:var(--surface-2);
  border:1px solid var(--line);border-radius:999px;padding:5px 12px;font-size:12px;
  color:var(--text-2);font-weight:500;white-space:nowrap}
.status-pill .dot{width:6px;height:6px;border-radius:50%;background:var(--success);
  box-shadow:0 0 0 3px rgba(5,150,105,.14)}

.ghost-btn{border:1px solid var(--line);background:var(--surface);color:var(--text-2);font:inherit;
  font-size:13px;font-weight:500;padding:7px 14px;border-radius:var(--r-md);cursor:pointer;
  white-space:nowrap;transition:background .14s,color .14s,border-color .14s}
.ghost-btn:hover{background:var(--surface-2);color:var(--text);border-color:var(--line-strong)}

/* ============================================================
   Upload screen
   ============================================================ */
.upload-view{flex:1;overflow:auto;display:grid;place-items:center;padding:40px 24px;background:var(--bg)}
.upload-inner{width:100%;max-width:560px;text-align:center}
.eyebrow{display:inline-block;font-size:11px;font-weight:600;letter-spacing:1.4px;
  color:var(--accent-text);background:var(--accent-soft);border:1px solid var(--accent-border);
  padding:5px 12px;border-radius:999px}
.upload-inner h1{font-size:clamp(30px,4.4vw,42px);line-height:1.15;letter-spacing:-1.4px;
  font-weight:700;margin:20px 0 14px}
.upload-inner em{font-style:normal;color:var(--accent)}
.lead{color:var(--text-2);line-height:1.65;margin:0 auto;max-width:420px;font-size:15px}

.dropzone{margin-top:30px;min-height:200px;border:1.5px dashed var(--line-strong);
  border-radius:var(--r-xl);display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:10px;cursor:pointer;background:var(--surface);color:var(--text-2);text-align:center;padding:26px;
  transition:border-color .16s,background .16s,box-shadow .16s}
.dropzone:hover{border-color:var(--accent);background:var(--accent-soft);box-shadow:var(--shadow-sm)}
.dropzone.dragover{border-color:var(--accent);background:var(--accent-soft);box-shadow:var(--ring)}
.dropzone.compact{min-height:150px;margin-top:0}
.dropzone input{display:none}
.dropzone strong{color:var(--text);font-size:14.5px;font-weight:600}
.drop-icon{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;
  background:var(--accent-soft);color:var(--accent);font-size:19px;border:1px solid var(--accent-border)}
.dropzone small{font-size:11.5px;letter-spacing:.4px;color:var(--text-3);font-weight:500}

.file-list:not(:empty){margin:16px 0 4px;text-align:left;border:1px solid var(--line);
  border-radius:var(--r-md);overflow:hidden;background:var(--surface)}
.file-row{display:flex;gap:11px;align-items:center;padding:11px 13px;font-size:13px;
  border-bottom:1px solid var(--line)}
.file-row:last-child{border-bottom:0}
.file-icon{width:24px;height:24px;border-radius:var(--r-sm);display:grid;place-items:center;flex-shrink:0;
  background:var(--accent-soft);color:var(--accent-text);font-size:10px;font-weight:600;
  font-family:'JetBrains Mono',monospace}
.file-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0;flex:1;
  font-weight:500;color:var(--text)}
.file-row small{color:var(--text-3);flex-shrink:0;font-variant-numeric:tabular-nums}
.row-remove{border:0;background:none;color:var(--text-3);cursor:pointer;font-size:12px;
  padding:5px 7px;border-radius:var(--r-sm);flex-shrink:0;line-height:1}
.row-remove:hover:not(:disabled){background:var(--danger-soft);color:var(--danger)}
.row-remove:disabled{opacity:.4;cursor:not-allowed}

.primary{margin-top:18px;height:44px;padding:0 22px;background:var(--accent);color:#fff;border:0;
  border-radius:var(--r-md);font:inherit;font-size:14px;font-weight:600;cursor:pointer;
  box-shadow:var(--shadow-sm);transition:background .14s,box-shadow .14s,transform .1s}
.primary:hover:not(:disabled){background:var(--accent-hover);box-shadow:var(--shadow-md)}
.primary:active:not(:disabled){transform:translateY(1px)}
.primary:disabled{background:var(--line-strong);color:#fff;box-shadow:none;cursor:not-allowed}

.upload-status{font-size:13px;color:var(--text-2);min-height:19px;margin:14px 0 0}
.upload-status.error{color:var(--danger)}
.upload-status.success{color:var(--success)}

/* ============================================================
   Workspace: document | chat
   ============================================================ */
.workspace-split{flex:1;min-height:0;display:grid;grid-template-columns:var(--split,1fr) 1px 1fr;
  background:var(--bg)}
.doc-pane,.chat-pane{display:flex;flex-direction:column;min-width:0;min-height:0;overflow:hidden}
.doc-pane{background:var(--bg)}
.chat-pane{background:var(--surface)}

.pane-head{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:0 20px;border-bottom:1px solid var(--line);height:64px;background:inherit}
.pane-title{min-width:0;flex:1;display:flex;flex-direction:column;justify-content:center;gap:2px;
  align-items:flex-start}
.pane-title small{color:var(--text-3);letter-spacing:1.2px;font-size:9.5px;font-weight:600}
.pane-title h2{margin:0;font-size:15px;font-weight:600;letter-spacing:-.2px}

#doc-select{font:inherit;font-size:14.5px;font-weight:600;letter-spacing:-.2px;color:var(--text);
  background:transparent;border:0;border-radius:var(--r-sm);padding:2px 24px 2px 6px;margin-left:-6px;
  max-width:100%;cursor:pointer;appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2394a3b8' stroke-width='1.6' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 7px center}
#doc-select:hover{background-color:var(--surface-2)}

.doc-tools{display:flex;align-items:center;gap:6px;flex-shrink:0}
.finder{position:relative;display:flex;align-items:center}
#doc-search{font:inherit;font-size:13px;width:180px;padding:8px 44px 8px 12px;
  border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface);
  color:var(--text);outline:0;transition:border-color .14s,box-shadow .14s}
#doc-search::placeholder{color:var(--text-3)}
#doc-search:focus{border-color:var(--accent);box-shadow:var(--ring)}
.find-count{position:absolute;right:10px;font-size:11px;color:var(--text-3);pointer-events:none;
  font-variant-numeric:tabular-nums;font-weight:500}
.icon-btn{width:30px;height:32px;border:1px solid var(--line);background:var(--surface);
  border-radius:var(--r-md);color:var(--text-2);cursor:pointer;font-size:11px;line-height:1;
  flex-shrink:0;transition:background .14s,color .14s,border-color .14s}
.icon-btn:hover:not(:disabled){background:var(--surface-2);color:var(--text);border-color:var(--line-strong)}
.icon-btn:disabled{opacity:.4;cursor:not-allowed}

/* Document text - monospace for a source-document feel */
.doc-body{flex:1;overflow:auto;padding:24px 26px;font-size:13px;line-height:1.85;color:var(--text-2);
  font-family:'JetBrains Mono',ui-monospace,monospace;
  white-space:pre-wrap;overflow-wrap:break-word;outline:0}
.doc-body mark{background:var(--highlight);color:var(--text);border-radius:3px;padding:1px 2px}
.doc-body mark.active{background:var(--highlight-active);box-shadow:0 0 0 2px var(--highlight-active)}
.doc-placeholder{color:var(--text-3);font-style:italic;font-family:'Inter',sans-serif}

.pane-foot{flex-shrink:0;border-top:1px solid var(--line);padding:0 26px;height:38px;
  font-size:11px;color:var(--text-3);display:flex;align-items:center;gap:16px;flex-wrap:wrap;
  background:var(--surface);font-variant-numeric:tabular-nums}

/* Divider */
.divider{background:var(--line);cursor:col-resize;position:relative;transition:background .14s}
.divider::after{content:'';position:absolute;inset:0 -4px;z-index:1}
.divider:hover,.divider.dragging{background:var(--accent)}
.divider span{display:none}

body.resizing{cursor:col-resize;user-select:none}

/* ============================================================
   Chat
   ============================================================ */
.messages{flex:1;overflow:auto;padding:22px 22px 6px;min-height:0}
.welcome,.bubble{display:flex;gap:11px;margin-bottom:18px;align-items:flex-start}
.welcome strong{font-size:14px;font-weight:600;display:block;margin-bottom:3px}
.welcome p{color:var(--text-2);line-height:1.6;margin:0}
.bubble .body{background:var(--surface-2);padding:11px 14px;border-radius:4px 12px 12px 12px;
  line-height:1.65;white-space:pre-wrap;overflow-wrap:break-word;font-size:13.5px;
  color:var(--text);max-width:100%;border:1px solid var(--line)}
.bubble.user{flex-direction:row-reverse}
.bubble.user .body{background:var(--accent);color:#fff;border-color:var(--accent);
  border-radius:12px 4px 12px 12px;box-shadow:var(--shadow-sm)}
.bubble.pending .body{color:var(--text-3)}
.bubble.error .body{background:var(--danger-soft);color:var(--danger);border-color:#fecaca}

.context-note{display:flex;align-items:center;gap:10px;margin:2px 0 16px;font-size:11px;
  color:var(--text-3);font-weight:500}
.context-note::before,.context-note::after{content:'';flex:1;height:1px;background:var(--line)}

.suggestions{flex-shrink:0;display:flex;flex-wrap:wrap;gap:7px;padding:0 22px 12px}
.suggestions:empty{display:none}
.chip{border:1px solid var(--line);background:var(--surface);color:var(--text-2);font:inherit;
  font-size:12.5px;padding:7px 13px;border-radius:999px;cursor:pointer;text-align:left;
  transition:background .14s,color .14s,border-color .14s}
.chip:hover{background:var(--accent-soft);color:var(--accent-text);border-color:var(--accent-border)}

.composer{flex-shrink:0;display:flex;gap:9px;align-items:flex-end;border:1px solid var(--line);
  border-radius:var(--r-lg);padding:8px 8px 8px 14px;margin:0 22px;background:var(--surface);
  transition:border-color .14s,box-shadow .14s}
.composer:focus-within{border-color:var(--accent);box-shadow:var(--ring)}
.composer textarea{border:0;outline:0;resize:none;width:100%;font:inherit;font-size:13.5px;
  line-height:1.55;padding:7px 0;max-height:150px;background:transparent;color:var(--text)}
.composer textarea::placeholder{color:var(--text-3)}
.composer button{background:var(--accent);color:#fff;border:0;border-radius:var(--r-md);height:34px;
  padding:0 15px;cursor:pointer;flex-shrink:0;font-size:14px;transition:background .14s}
.composer button:hover:not(:disabled){background:var(--accent-hover)}
.composer button:disabled{background:var(--line-strong);cursor:not-allowed}
.privacy{flex-shrink:0;text-align:center;color:var(--text-3);font-size:11px;margin:9px 22px 14px}

/* ============================================================
   Overlay
   ============================================================ */
.overlay{position:fixed;inset:0;background:rgba(15,23,42,.5);backdrop-filter:blur(3px);
  display:grid;place-items:center;padding:24px;z-index:50}
.sheet{background:var(--surface);border-radius:var(--r-xl);padding:22px;width:100%;max-width:500px;
  max-height:85vh;overflow:auto;box-shadow:var(--shadow-lg);border:1px solid var(--line)}
.sheet-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.sheet-head h3{margin:0;font-size:16px;font-weight:600;letter-spacing:-.2px}
.sheet-docs{margin-top:20px}
.sheet-docs:empty{display:none}
.existing-head{font-size:9.5px;letter-spacing:1.2px;color:var(--text-3);font-weight:600;
  margin-bottom:8px}
.sheet-docs .file-list-box{border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden}
.row-open{border:1px solid var(--line);background:var(--surface);color:var(--text-2);font:inherit;
  font-size:12px;font-weight:500;border-radius:var(--r-sm);padding:5px 11px;cursor:pointer;flex-shrink:0;
  transition:background .14s,color .14s,border-color .14s}
.row-open:hover{background:var(--accent-soft);color:var(--accent-text);border-color:var(--accent-border)}

/* ============================================================
   Responsive
   ============================================================ */
@media(max-width:900px){
  :root{--bar-h:54px}
  .bar{padding:0 14px}
  .workspace-split{grid-template-columns:1fr;grid-template-rows:44vh 1px 1fr}
  .divider{cursor:row-resize}
  .divider::after{inset:-4px 0}
  .doc-pane{border-bottom:1px solid var(--line)}
  .pane-head{padding:0 14px;height:56px;gap:8px}
  .pane-title small{display:none}
  .doc-body{padding:16px 14px}
  .pane-foot{padding:0 14px}
  #doc-search{width:120px}
  .messages{padding:16px 14px 4px}
  .suggestions{padding:0 14px 10px}
  .composer{margin:0 14px}
  .privacy{margin:8px 14px 12px}
  .upload-inner h1{font-size:27px}
}