:root {
  --app-bg: #f3f5f9;
  --app-surface: #ffffff;
  --app-ink: #0f172a;
  --app-muted: #64748b;
  --app-border: #e2e8f0;
  --app-primary: #0f766e;
  --app-primary-hover: #0b5f59;
  --app-shadow-sm: 0 4px 14px rgba(15, 23, 42, 0.06);
  --app-shadow: 0 10px 28px rgba(15, 23, 42, 0.08);

  /* Legacy aliases used by module-specific styles (dashboard, etc.) */
  --primary-color: var(--app-primary);
  --secondary-color: #e6f4f3;
  --background-color: var(--app-bg);
  --card-background: var(--app-surface);
  --text-primary: var(--app-ink);
  --text-secondary: var(--app-muted);
  --border-color: var(--app-border);
  --border-radius: 12px;
  --shadow: var(--app-shadow-sm);
}

html,
body {
  background: var(--app-bg);
  color: var(--app-ink);
}

.container-fluid {
  padding-left: 0.75rem;
  padding-right: 0.75rem;
}

/* Professional base cards */
.card {
  border: 1px solid var(--app-border);
  border-radius: 14px;
  box-shadow: var(--app-shadow-sm);
}

.card-header {
  background: #fff;
  border-bottom: 1px solid var(--app-border);
  font-weight: 700;
}

/* Unified button system */
.btn {
  border-radius: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
  padding: 0.5rem 0.95rem;
  transition: all 170ms ease;
}

.btn-primary {
  background: var(--app-primary);
  border-color: var(--app-primary);
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--app-primary-hover);
  border-color: var(--app-primary-hover);
  color: #fff;
  box-shadow: 0 8px 20px rgba(15, 118, 110, 0.22);
}

.btn-success {
  background: #15803d;
  border-color: #15803d;
}

.btn-success:hover,
.btn-success:focus {
  background: #166534;
  border-color: #166534;
}

.btn-outline-secondary {
  color: #334155;
  border-color: #cbd5e1;
}

.btn-outline-secondary:hover,
.btn-outline-secondary:focus {
  background: #f8fafc;
  color: #0f172a;
  border-color: #94a3b8;
}

.btn-light {
  background: #fff;
  border-color: #dbe3ef;
}

/* Better form consistency */
.form-control,
.form-select {
  border-radius: 10px;
  border-color: #d7deea;
  min-height: 40px;
}

.form-control:focus,
.form-select:focus {
  border-color: rgba(15, 118, 110, 0.55);
  box-shadow: 0 0 0 0.2rem rgba(15, 118, 110, 0.12);
}

/* Full-page app shell polish */
.app-shell-main {
  min-height: 100vh;
}

.app-shell-content {
  padding: 0.85rem 0.75rem 1.25rem;
}

.app-shell-topbar {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--app-border);
  backdrop-filter: blur(8px);
}

@media (min-width: 992px) {
  .app-shell-content {
    padding: 1rem 1rem 1.4rem;
  }
}