:root {
  --bg: #0c0d14;
  --surface: #131626;
  --surface-2: #191d31;
  --border: #2b2f49;
  --text: #eceffd;
  --muted: #9fa6ce;
  --accent: #8b5cf6;
  --accent-2: #a78bfa;
  --danger: #ef4444;
  --success: #22c55e;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Segoe UI", Tahoma, sans-serif; background: radial-gradient(circle at 10% 0%, #1a1533, var(--bg)); color: var(--text); }
.hidden { display: none !important; }

.login-gate { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.login-card { width: min(420px, 100%); background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 24px; display: grid; gap: 10px; }
.login-card h1 { margin: 0; font-size: 22px; }
.login-card p { margin: 0 0 8px; color: var(--muted); }
input, select, button { border-radius: 10px; border: 1px solid var(--border); padding: 10px 12px; background: var(--surface-2); color: var(--text); }
button { background: linear-gradient(90deg, var(--accent), var(--accent-2)); border: none; cursor: pointer; font-weight: 600; }
button.ghost { background: transparent; border: 1px solid var(--border); }
.error { color: #ff8d8d; min-height: 18px; font-size: 13px; }

.app-shell { display: grid; grid-template-columns: 260px 1fr; min-height: 100vh; }
.sidebar { border-right: 1px solid var(--border); background: rgba(19,22,38,0.9); padding: 18px; display: grid; grid-template-rows: auto 1fr auto; gap: 18px; }
.brand { font-weight: 700; font-size: 18px; }
.menu { display: grid; gap: 8px; }
.tab { text-align: left; background: transparent; border: 1px solid var(--border); }
.tab.active { background: rgba(139,92,246,0.2); border-color: var(--accent); }
.sidebar-foot { display: grid; gap: 8px; }

.content { padding: 20px; }
.panel { display: none; }
.panel.active { display: block; }
h2 { margin-top: 0; }

.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 16px; }
.kpi { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 12px; }
.kpi .label { color: var(--muted); font-size: 12px; }
.kpi .value { font-size: 24px; font-weight: 700; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 14px; }
.chart-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 14px; }
canvas { width: 100% !important; height: 260px !important; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid var(--border); padding: 10px; text-align: left; }
.meta { color: var(--muted); font-size: 12px; margin-top: 8px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.stack { display: grid; gap: 10px; }
.insight { background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--accent); border-radius: 10px; padding: 10px; }
.insight.high { border-left-color: var(--danger); }
.insight.low { border-left-color: var(--success); }

.chat-fab { position: fixed; right: 18px; bottom: 18px; width: 58px; height: 58px; border-radius: 999px; z-index: 30; }
.chat-panel { position: fixed; right: 18px; bottom: 86px; width: min(420px, calc(100vw - 24px)); height: 520px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; display: grid; grid-template-rows: auto 1fr auto; z-index: 30; }
.chat-head { display: flex; justify-content: space-between; align-items: center; padding: 10px 12px; border-bottom: 1px solid var(--border); }
.chat-body { padding: 12px; overflow: auto; display: grid; gap: 8px; }
.chat-msg { background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; padding: 8px; white-space: pre-wrap; }
.chat-msg.user { border-color: var(--accent); }
.chat-input-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; padding: 10px; border-top: 1px solid var(--border); }

@media (max-width: 920px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: sticky; top: 0; z-index: 20; grid-template-rows: auto auto auto; }
}