/* SQL Data Consulting — Clean, minimalist layout
   Target: CFO/COO audience. Professional, trustworthy, fast. */

:root {
  --nav-bg: #1a1f2e;
  --nav-text: #9ca3b4;
  --nav-active: #ffffff;
  --accent: #4a7a9c;
  --accent-light: #6b9bc0;
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #1e2229;
  --text-muted: #6b7280;
  --border: #e2e4e8;
  --banner-height: 56px;
  --sidebar-width: 200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── TOP BANNER ── */
.banner {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--banner-height);
  background: var(--nav-bg);
  display: flex;
  align-items: center;
  padding: 0 24px;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.banner-brand {
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.banner-brand small {
  font-weight: 400;
  color: var(--nav-text);
  font-size: 0.85rem;
  margin-left: 8px;
}

/* ── LEFT SIDEBAR ── */
.sidebar {
  position: fixed; top: var(--banner-height); left: 0; bottom: 0;
  width: var(--sidebar-width);
  background: var(--nav-bg);
  padding: 24px 0;
  overflow-y: auto;
  z-index: 99;
}
.sidebar a {
  display: block;
  padding: 8px 24px;
  color: var(--nav-text);
  font-size: 0.85rem;
  font-weight: 450;
  text-decoration: none;
  transition: color 0.15s, background 0.15s;
  border-left: 3px solid transparent;
}
.sidebar a:hover {
  color: #fff;
  background: rgba(255,255,255,0.04);
}
.sidebar a.active {
  color: var(--nav-active);
  border-left-color: var(--accent-light);
  background: rgba(255,255,255,0.06);
}
.sidebar-section {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(255,255,255,0.25);
  padding: 16px 24px 6px;
  font-weight: 600;
}

/* ── MAIN CONTENT ── */
.main {
  margin-left: var(--sidebar-width);
  margin-top: var(--banner-height);
  min-height: calc(100vh - var(--banner-height));
  padding: 40px 48px;
  max-width: 960px;
}
.main h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  color: var(--text);
}
.main .subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.5;
}
.main h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 40px;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.main p {
  margin-bottom: 16px;
  color: #374151;
  max-width: 680px;
}
.main .lead {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.7;
}

/* ── CARDS ── */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 20px;
}
.card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* ── INSIGHT CALLOUT ── */
.callout {
  background: #eef3f8;
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  border-radius: 0 6px 6px 0;
  margin-bottom: 20px;
  max-width: 680px;
}
.callout p {
  font-size: 0.88rem;
  margin-bottom: 0;
  color: #2c3e50;
}
.callout strong {
  color: var(--accent);
  font-weight: 600;
}

/* ── CHARTS ── */
.chart-container {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin: 24px 0;
  max-width: 700px;
}

/* ── BUTTONS ── */
.btn {
  display: inline-block;
  padding: 10px 24px;
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.15s;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-light); }
.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}
.btn-outline:hover {
  background: var(--accent);
  color: #fff;
}

/* ── FOOTER ── */
.footer {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-muted);
}
.footer a { color: var(--accent); text-decoration: none; }

/* ── RESPONSIVE ── */
@media (max-width: 700px) {
  .sidebar { display: none; }
  .main { margin-left: 0; padding: 24px 20px; }
  .banner { padding: 0 16px; }
}