:root{
  --bg:#0b1020;
  --panel:#0f1724;
  --muted:#93a0b0;
  --accent:#10a37f;
  --user:#155263;
  --assistant:#1f2937;
  --msg-bg:#0b1220;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;color:#e6eef6;background:linear-gradient(180deg,var(--bg),#051024)}
.app{height:100%;display:flex;align-items:center;justify-content:center;padding:24px}
.chat-container{width:100%;max-width:820px;height:80vh;background:var(--panel);border-radius:12px;display:flex;flex-direction:column;box-shadow:0 10px 30px rgba(2,6,23,0.6);overflow:hidden}
.chat-header{padding:14px 18px;border-bottom:1px solid rgba(255,255,255,0.03);color:var(--muted);font-weight:600}
.messages{flex:1;overflow:auto;padding:18px;display:flex;flex-direction:column;gap:12px}
.message{max-width:78%;padding:12px 14px;border-radius:12px;color:#e6eef6;line-height:1.4}
.msg-user{align-self:flex-end;background:linear-gradient(180deg,var(--user),#0e3b4a);border-bottom-right-radius:4px}
.msg-assistant{align-self:flex-start;background:linear-gradient(180deg,#0f1b2a,var(--assistant));border-bottom-left-radius:4px}
.msg-meta{margin-top:8px;font-size:13px;color:var(--muted)}
.input-area{padding:12px;border-top:1px solid rgba(255,255,255,0.03);background:linear-gradient(180deg,transparent,rgba(0,0,0,0.03))}
#input{width:100%;resize:none;padding:10px 12px;border-radius:8px;background:var(--msg-bg);border:1px solid rgba(255,255,255,0.03);color:#e6eef6;font-size:15px;outline:none}
.loading{opacity:0.9;font-style:italic;color:var(--muted)}
.kg-list{margin:8px 0 0 0;padding-left:18px}
.docs-list{margin:8px 0 0 0;padding-left:18px}
.spinner{display:inline-block;height:12px;width:12px;border-radius:50%;border:2px solid rgba(255,255,255,0.08);border-top-color:var(--accent);animation:spin 1s linear infinite;margin-right:8px;vertical-align:middle}
@keyframes spin{to{transform:rotate(360deg)}}
.small{font-size:13px;color:var(--muted)}

/* Knowledge Graph table */
.kg-table{width:100%;border-collapse:collapse;margin-top:8px}
.kg-table th,.kg-table td{padding:8px 10px;border-bottom:1px solid rgba(255,255,255,0.03);text-align:left;font-size:14px}
.kg-table th{color:var(--muted);font-weight:600;font-size:13px}
.kg-table tr:nth-child(even) td{background:rgba(255,255,255,0.01)}
.kg-badge{display:inline-block;padding:4px 8px;border-radius:999px;font-size:12px;font-weight:600}
.freq-high{background:#083E2B;color:#8FF3D6}
.freq-medium{background:#353016;color:#FFE9B3}
.freq-low{background:rgba(255,255,255,0.04);color:var(--muted)}

.section-title{margin-top:6px;margin-bottom:6px;color:var(--muted);font-size:13px;font-weight:700}
.answer-text{white-space:pre-wrap;font-size:15px}