:root {
  --brand-primary: #14532d;   /* deep corporate green */
  --brand-accent: #d4a017;    /* gold accent */
  --sidebar-width: 240px;
  --topbar-height: 56px;
}

body {
  background-color: #f4f6f8;
  font-family: 'Segoe UI', Roboto, Arial, sans-serif;
}

.app-topbar {
  height: var(--topbar-height);
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
  z-index: 1030;
}

.app-body {
  min-height: calc(100vh - var(--topbar-height));
}

.app-sidebar {
  width: var(--sidebar-width);
  background: var(--brand-primary);
  min-height: calc(100vh - var(--topbar-height));
  flex-shrink: 0;
  padding-top: .75rem;
}

.app-sidebar .nav-link {
  color: rgba(255,255,255,.85);
  padding: .6rem 1rem;
  border-radius: 0;
}

.app-sidebar .nav-link i { width: 20px; text-align: center; margin-right: 8px; }

.app-sidebar .nav-link:hover,
.app-sidebar .nav-link.active {
  background: rgba(255,255,255,.12);
  color: #fff;
  border-left: 3px solid var(--brand-accent);
}

.app-sidebar .nav-heading {
  color: rgba(255,255,255,.5);
  text-transform: uppercase;
  font-size: .7rem;
  padding: 1rem 1rem .25rem;
  letter-spacing: .05em;
}

.app-content {
  flex: 1;
  padding: 1.5rem;
}

.stat-card {
  border: none;
  border-radius: .75rem;
  box-shadow: 0 1px 3px rgba(0,0,0,.08);
}

.stat-card .stat-value { font-size: 1.6rem; font-weight: 700; }

.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--brand-primary), #0b2e18);
}

.login-card {
  width: 100%;
  max-width: 380px;
  border-radius: 1rem;
  border: none;
  box-shadow: 0 10px 40px rgba(0,0,0,.25);
}

@media (max-width: 991.98px) {
  .app-sidebar {
    position: fixed;
    left: -260px;
    top: var(--topbar-height);
    z-index: 1040;
    transition: left .2s ease-in-out;
  }
  .app-sidebar.open { left: 0; }
}