:root {
  --bg: #f3f6fb;
  --ink: #172033;
  --muted: #68748a;
  --line: #dde5ef;
  --primary: #f0522e;
  --side: #101a2b;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; border: 0; border-radius: 8px; padding: 10px 16px; font-weight: 800; }
.primary { background: var(--primary); color: #fff; }
.outline { background: #fff; color: var(--ink); border: 1px solid var(--line); }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.login-view { min-height: 100vh; display: grid; place-items: center; }
.login-card { width: min(420px, calc(100vw - 32px)); display: grid; gap: 16px; background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 28px; }
label { display: grid; gap: 7px; color: #344056; font-weight: 800; }
input, select, textarea { width: 100%; border: 1px solid var(--line); border-radius: 8px; padding: 11px 12px; background: #fff; color: var(--ink); }
.app { min-height: 100vh; display: grid; grid-template-columns: 240px minmax(0, 1fr); }
.sidebar { position: sticky; top: 0; min-height: 100vh; background: var(--side); color: #fff; padding: 24px 16px; display: grid; grid-template-rows: auto 1fr auto; gap: 24px; }
.brand { color: #ff6a3f; font-size: 12px; font-weight: 900; letter-spacing: .08em; }
.sidebar h1 { margin: 6px 0 0; font-size: 28px; }
nav { display: grid; align-content: start; gap: 8px; }
.nav { text-align: left; background: transparent; color: #d9e1ef; }
.nav.active, .nav:hover { background: rgba(255,255,255,.12); color: #fff; }
.user-box { border: 1px solid rgba(255,255,255,.18); border-radius: 8px; padding: 14px; display: grid; gap: 10px; }
.content { padding: 28px; }
.page-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.page-head span { color: var(--primary); font-size: 12px; font-weight: 900; letter-spacing: .08em; }
.page-head h2 { margin: 4px 0 0; font-size: 30px; }
.panel { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 18px; }
.browser-grid { display: grid; grid-template-columns: 280px minmax(620px, 1fr); gap: 18px; align-items: start; }
.folder-tree { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 8px; display: grid; gap: 6px; }
.folder { display: grid; grid-template-columns: 1fr auto; gap: 10px; text-align: left; background: transparent; color: var(--ink); }
.folder:hover { background: #f8fafc; }
.folder b { display: block; }
.folder small { display: block; color: var(--muted); font-weight: 600; margin-top: 2px; }
.folder em { font-style: normal; background: #eef2f7; color: var(--muted); border-radius: 999px; padding: 4px 8px; align-self: center; }
.filters { display: grid; grid-template-columns: minmax(220px, 1fr) 180px 180px; gap: 12px; margin-bottom: 14px; }
.doc-list { display: grid; gap: 10px; }
.doc-card { border: 1px solid var(--line); border-radius: 8px; padding: 14px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(180px, 260px) auto; gap: 16px; align-items: center; }
.doc-card h3 { margin: 0 0 4px; font-size: 18px; }
.source { margin: 0 0 8px; color: var(--muted); overflow-wrap: anywhere; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tags span { border: 1px solid var(--line); border-radius: 999px; padding: 3px 8px; color: var(--muted); font-size: 12px; font-weight: 800; }
.doc-meta { display: grid; gap: 4px; color: var(--muted); }
.doc-meta b { color: var(--ink); font-size: 14px; }
.doc-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.upload-panel { max-width: 720px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.upload-panel label:nth-child(n+3), .file-row, .upload-panel p { grid-column: 1 / -1; }
.file-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px; align-items: center; }
.answer { min-height: 180px; border: 1px solid var(--line); border-radius: 8px; margin-top: 14px; padding: 14px; background: #fbfdff; line-height: 1.7; }
.source-list { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.source-list button { border: 1px solid var(--line); background: #fff; color: var(--muted); padding: 6px 9px; }
table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { border-bottom: 1px solid var(--line); text-align: left; padding: 10px; vertical-align: top; }
th { color: var(--muted); font-size: 13px; }
.modal { position: fixed; inset: 0; background: rgba(15, 23, 42, .55); display: grid; place-items: center; padding: 28px; }
.modal-card { width: min(1000px, 100%); max-height: 86vh; overflow: auto; background: #fff; border-radius: 10px; padding: 22px; position: relative; }
.modal-close { position: absolute; right: 14px; top: 14px; border-radius: 999px; background: #f1f5f9; }
.chunk { border: 1px solid var(--line); border-radius: 8px; padding: 12px; margin-bottom: 10px; }
pre { white-space: pre-wrap; word-break: break-word; color: #334155; line-height: 1.6; }
@media (max-width: 960px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: static; min-height: auto; }
  .browser-grid, .filters, .doc-card, .upload-panel { grid-template-columns: 1fr; }
}