:root {
  --rs-bg: #f6f7fb;
  --rs-ink: #0f172a;
  --rs-muted: #64748b;
  --rs-border: #e5e7eb;
  --rs-primary: #1e40af;
  --rs-primary-soft: #e0e7ff;
  --rs-accent: #0891b2;
  --rs-good: #15803d;
  --rs-warn: #b45309;
  --rs-danger: #b91c1c;
  --rs-card-shadow: 0 1px 2px rgba(15,23,42,0.04), 0 4px 16px rgba(15,23,42,0.06);
}

* { box-sizing: border-box; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--rs-bg);
  color: var(--rs-ink);
  margin: 0;
  min-height: 100vh;
}

.topbar {
  background: white;
  border-bottom: 1px solid var(--rs-border);
  padding: 0.75rem 0;
}
.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--rs-ink);
  text-decoration: none;
}
.brand i { color: var(--rs-primary); font-size: 1.4rem; }
.topbar-actions { display: flex; gap: 1.25rem; align-items: center; }
.topbar-link {
  color: var(--rs-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.92rem;
}
.topbar-link:hover { color: var(--rs-primary); }
.topbar-user { color: var(--rs-ink); font-weight: 600; font-size: 0.92rem; }

.main-content { max-width: 1200px; margin: 0 auto; padding: 2rem 1.5rem; }

/* === LOGIN === */
.login-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: linear-gradient(135deg, #f0f4ff 0%, #fff 60%, #ecfeff 100%);
}
.login-card {
  background: white;
  border-radius: 14px;
  box-shadow: var(--rs-card-shadow);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 400px;
}
.login-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--rs-ink);
  margin-bottom: 0.25rem;
}
.login-brand i { color: var(--rs-primary); font-size: 1.7rem; }
.login-sub { color: var(--rs-muted); margin-bottom: 1.5rem; font-size: 0.95rem; }
.login-card .btn-primary { background: var(--rs-primary); border: none; padding: 0.6rem; font-weight: 600; }
.login-card .form-control { padding: 0.55rem 0.75rem; border-radius: 8px; }

/* === QUERY === */
.query-shell {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 1.5rem;
}
@media (max-width: 960px) { .query-shell { grid-template-columns: 1fr; } }

.query-hero h1 { font-size: 1.85rem; font-weight: 800; margin: 0 0 0.35rem; }
.query-hero p { color: var(--rs-muted); margin: 0 0 1.25rem; font-size: 0.98rem; }

.ask-form {
  display: flex; gap: 0.5rem;
  background: white;
  border: 1px solid var(--rs-border);
  border-radius: 12px;
  padding: 0.45rem;
  box-shadow: var(--rs-card-shadow);
}
.ask-form input {
  flex: 1;
  border: none;
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  background: transparent;
  color: var(--rs-ink);
}
.ask-form input:focus { outline: none; }
.ask-form button {
  background: var(--rs-primary);
  color: white;
  border: none;
  border-radius: 9px;
  padding: 0 1.1rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.ask-form button:disabled { opacity: 0.6; cursor: progress; }
.ask-form button:hover:not(:disabled) { background: #1e3a8a; }

.ask-suggestions { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin: 0.85rem 0 1.5rem; font-size: 0.86rem; color: var(--rs-muted); }
.suggestion {
  background: white;
  border: 1px solid var(--rs-border);
  border-radius: 999px;
  padding: 0.3rem 0.85rem;
  font-size: 0.86rem;
  color: var(--rs-ink);
  cursor: pointer;
  transition: all 0.15s;
}
.suggestion:hover { border-color: var(--rs-primary); color: var(--rs-primary); background: var(--rs-primary-soft); }

.status-box {
  display: flex; align-items: center; gap: 0.7rem;
  padding: 0.85rem 1.1rem;
  background: white;
  border: 1px solid var(--rs-border);
  border-radius: 12px;
  color: var(--rs-muted);
  font-weight: 500;
  margin-bottom: 1rem;
}
.spinner {
  width: 18px; height: 18px;
  border: 2.5px solid var(--rs-primary-soft);
  border-top-color: var(--rs-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.result-card {
  background: white;
  border: 1px solid var(--rs-border);
  border-radius: 12px;
  box-shadow: var(--rs-card-shadow);
  padding: 1.25rem 1.5rem 1.5rem;
}
.result-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--rs-danger);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}
.result-meta {
  display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center;
  font-size: 0.84rem;
  margin-bottom: 0.6rem;
}
.meta-pill {
  font-weight: 700; font-size: 0.74rem;
  padding: 0.18rem 0.55rem; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.pill-good { background: #dcfce7; color: var(--rs-good); }
.pill-warn { background: #fef3c7; color: var(--rs-warn); }
.meta-muted { color: var(--rs-muted); font-size: 0.84rem; }

.result-interpretation {
  background: #ecfeff;
  border-left: 3px solid var(--rs-accent);
  padding: 0.85rem 1.1rem;
  border-radius: 6px;
  color: #155e75;
  margin-bottom: 1.1rem;
  font-size: 0.97rem;
  line-height: 1.55;
}
.result-interpretation:empty { display: none; }

.single-stat { padding: 1.5rem 0.5rem 1rem; text-align: center; }
.single-stat .stat-label {
  font-size: 0.78rem; text-transform: uppercase; color: var(--rs-muted);
  letter-spacing: 0.06em; font-weight: 600;
}
.single-stat .stat-value {
  font-size: 3rem; font-weight: 800; color: var(--rs-primary);
  margin-top: 0.5rem; letter-spacing: -0.02em;
}

.empty-result { padding: 1.5rem; text-align: center; color: var(--rs-muted); }

.table-scroll { overflow-x: auto; max-height: 480px; overflow-y: auto; }
.result-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.result-table thead th {
  position: sticky; top: 0;
  background: #f8fafc;
  text-align: left;
  font-weight: 600; color: var(--rs-ink);
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--rs-border);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.result-table tbody td {
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid #f1f5f9;
  white-space: nowrap;
}
.result-table tbody tr:hover { background: #f8fafc; }

.result-actions { display: flex; gap: 0.5rem; margin-top: 0.9rem; }
.sql-display {
  margin-top: 0.85rem;
  background: #0f172a;
  color: #e2e8f0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  white-space: pre-wrap;
  word-break: break-word;
}

.hidden { display: none !important; }

/* === HISTORY === */
.history-panel {
  background: white;
  border: 1px solid var(--rs-border);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: var(--rs-card-shadow);
  height: fit-content;
  position: sticky; top: 1rem;
  max-height: 80vh;
  overflow-y: auto;
}
.history-header {
  display: flex; align-items: center; gap: 0.45rem;
  font-weight: 700; font-size: 0.92rem; color: var(--rs-ink);
  margin-bottom: 0.85rem;
}
.history-list { list-style: none; padding: 0; margin: 0; }
.history-empty { color: var(--rs-muted); font-size: 0.88rem; padding: 1rem 0; text-align: center; }
.history-item {
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--rs-border);
  border-radius: 8px;
  margin-bottom: 0.55rem;
  cursor: pointer;
  transition: all 0.12s;
}
.history-item:hover { border-color: var(--rs-primary); background: var(--rs-primary-soft); }
.history-q { font-weight: 600; font-size: 0.88rem; color: var(--rs-ink); margin-bottom: 0.3rem; line-height: 1.35; }
.history-meta { display: flex; gap: 0.4rem; align-items: center; flex-wrap: wrap; font-size: 0.78rem; }
.history-meta .muted { color: var(--rs-muted); }