:root {
  --bs-primary: #4338ca;
  --bs-primary-rgb: 67, 56, 202;
  --bs-primary-bg-subtle: #e0e7ff;
  --bs-primary-border-subtle: #c7d2fe;
  --bs-secondary: #334155;
  --bs-secondary-rgb: 51, 65, 85;
  --bs-info: #0284c7;
  --bs-success: #059669;
  --bs-warning: #d97706;
  --bs-danger: #dc2626;
  --bs-dark: #0f172a;
  --bs-light: #f8fafc;
  --bs-border-radius: 0.75rem;
  --bs-border-radius-lg: 1rem;
  --bs-border-radius-xl: 1.25rem;
  --bs-border-radius-2xl: 1.5rem;
  --bs-body-bg: #f6f8fc;
  --bs-body-color: #0f172a;
  --bs-border-color: rgba(15, 23, 42, 0.1);
  --bs-secondary-color: #475569;
  --bs-tertiary-color: #64748b;
  --bs-font-sans-serif: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --app-surface: rgba(255, 255, 255, 0.92);
  --app-surface-muted: linear-gradient(180deg, rgba(248, 250, 252, 0.98), rgba(241, 245, 249, 0.96));
  --app-border-strong: rgba(15, 23, 42, 0.12);
  --app-shadow-sm: 0 12px 28px rgba(15, 23, 42, 0.06);
  --app-shadow-md: 0 20px 46px rgba(15, 23, 42, 0.08);
}

body.app-body {
  background:
    radial-gradient(circle at top left, rgba(67, 56, 202, 0.12), transparent 28%),
    radial-gradient(circle at top right, rgba(2, 132, 199, 0.08), transparent 24%),
    linear-gradient(180deg, #fcfdff 0%, #f4f7fb 56%, #edf2f7 100%);
  min-height: 100vh;
}

.app-shell {
  min-height: 100vh;
}

.card {
  background: var(--app-surface);
  border: 1px solid var(--app-border-strong) !important;
  box-shadow: var(--app-shadow-sm) !important;
}

.btn {
  border-radius: 0.9rem;
  font-weight: 600;
  transition:
    transform 0.16s ease,
    box-shadow 0.16s ease,
    background-color 0.16s ease,
    border-color 0.16s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(180deg, #4f46e5 0%, #4338ca 100%);
  border-color: #4338ca;
  box-shadow: 0 10px 24px rgba(67, 56, 202, 0.18);
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active {
  background: linear-gradient(180deg, #4338ca 0%, #3730a3 100%) !important;
  border-color: #3730a3 !important;
  box-shadow: 0 14px 28px rgba(67, 56, 202, 0.22) !important;
}

.btn-outline-secondary {
  background: rgba(255, 255, 255, 0.72);
  border-color: rgba(51, 65, 85, 0.16);
  color: #334155;
}

.btn-outline-secondary:hover,
.btn-outline-secondary:focus {
  background: #ffffff;
  border-color: rgba(67, 56, 202, 0.22);
  color: #1e293b;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

.badge {
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge.text-bg-light {
  background: #eef2ff !important;
  color: #3730a3 !important;
  border: 1px solid rgba(67, 56, 202, 0.14);
}

.app-hero {
  background:
    radial-gradient(circle at top right, rgba(191, 219, 254, 0.24), transparent 32%),
    linear-gradient(135deg, #111827 0%, #312e81 48%, #2563eb 100%);
  color: #fff;
  box-shadow: var(--app-shadow-md);
}

.app-muted-card {
  background: var(--app-surface-muted);
}

.app-section-title {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #4f46e5;
  font-weight: 600;
}

.app-phone-shell {
  max-width: 360px;
  border-radius: 2rem;
  background: linear-gradient(180deg, #0f172a 0%, #111827 100%);
  border: 1px solid rgba(148, 163, 184, 0.22);
  box-shadow: 0 22px 48px rgba(15, 23, 42, 0.24);
}

.app-phone-screen {
  border-radius: 1.5rem;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.question-nav .btn {
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

.survey-surface .card,
.survey-surface .list-group-item,
.survey-surface .table {
  box-shadow: var(--app-shadow-sm);
}

.survey-surface .list-group-item,
.survey-surface .table,
.survey-surface .form-control,
.survey-surface .table > :not(caption) > * > * {
  border-color: rgba(15, 23, 42, 0.1);
}

.survey-surface .list-group-item {
  background: rgba(255, 255, 255, 0.96);
}

.survey-surface .form-control {
  border-radius: 0.95rem;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: none;
}

.survey-surface .form-control:focus {
  border-color: rgba(67, 56, 202, 0.34);
  box-shadow: 0 0 0 0.25rem rgba(67, 56, 202, 0.12);
}

.survey-surface .form-check-input:checked {
  background-color: var(--bs-primary);
  border-color: var(--bs-primary);
}

.survey-surface .form-check-input:focus {
  box-shadow: 0 0 0 0.25rem rgba(67, 56, 202, 0.12);
}

.app-status-tile {
  min-height: 100%;
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%) !important;
  border: 1px solid rgba(148, 163, 184, 0.1) !important;
  box-shadow: 0 18px 36px rgba(15, 23, 42, 0.18) !important;
}

.app-soft-shadow {
  box-shadow: var(--app-shadow-md);
}

.app-card-title {
  font-weight: 600;
}

.app-kpi-value {
  font-size: 2rem;
  font-weight: 700;
}

.app-runtime-sidebar .card + .card {
  margin-top: 1rem;
}

.app-runtime-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.alert {
  border-radius: 1rem;
  border-width: 1px;
  box-shadow: none;
}

.alert-warning {
  background: #fff7ed;
  border-color: #fed7aa;
  color: #9a3412;
}

.alert-info {
  background: #eff6ff;
  border-color: #bfdbfe;
  color: #1d4ed8;
}

a.card {
  transition:
    transform 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease;
}

a.card:hover {
  transform: translateY(-2px);
  border-color: rgba(67, 56, 202, 0.18) !important;
  box-shadow: var(--app-shadow-md) !important;
}