:root {
  --im-primary: #2455a4;
  --im-primary-dark: #173b78;
  --im-sidebar-bg: #16274b;
  --im-sidebar-hover: #1f3563;
  --im-sidebar-active: #2455a4;
  --im-accent: #f5a623;
  --im-body-bg: #f2f4f8;
  --im-card-radius: 0.6rem;
}

html, body {
  height: 100%;
  background-color: var(--im-body-bg);
}

body {
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 0.925rem;
  color: #26324a;
}

/* ---------- App shell ---------- */
.app-shell {
  display: flex;
  min-height: 100vh;
}

.im-sidebar {
  width: 250px;
  flex-shrink: 0;
  background: var(--im-sidebar-bg);
  color: #dbe4f7;
  min-height: 100vh;
  position: sticky;
  top: 0;
  align-self: flex-start;
  transition: margin-left .25s ease;
}

.im-sidebar .brand {
  padding: 1.1rem 1.25rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,.08);
  display: flex;
  align-items: center;
  gap: .6rem;
}

.im-sidebar .brand .logo-badge {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--im-accent);
  color: #16274b;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.im-sidebar .nav-section-title {
  text-transform: uppercase;
  font-size: .7rem;
  letter-spacing: .07em;
  color: #7f93c2;
  padding: .9rem 1.25rem .25rem;
}

.im-sidebar .nav-link {
  color: #c7d3ee;
  padding: .55rem 1.25rem;
  border-left: 3px solid transparent;
  display: flex;
  align-items: center;
  gap: .6rem;
}

.im-sidebar .nav-link i { width: 1.1rem; text-align: center; }

.im-sidebar .nav-link:hover {
  background: var(--im-sidebar-hover);
  color: #fff;
}

.im-sidebar .nav-link.active {
  background: var(--im-sidebar-active);
  color: #fff;
  border-left-color: var(--im-accent);
  font-weight: 600;
}

.im-sidebar .nav-sub .nav-link {
  padding-left: 2.6rem;
  font-size: .87rem;
}

.im-main {
  flex-grow: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.im-topbar {
  background: #fff;
  border-bottom: 1px solid #e4e8f1;
  padding: .6rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 1020;
}

.im-topbar .user-chip {
  display: flex;
  align-items: center;
  gap: .6rem;
}

.im-topbar .user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--im-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.im-content {
  padding: 1.25rem;
  flex-grow: 1;
}

.im-page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 1rem;
}

.im-page-header h1 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: .15rem;
}

.breadcrumb {
  background: transparent;
  padding: 0;
  margin-bottom: .25rem;
  font-size: .82rem;
}

/* ---------- Cards / KPIs ---------- */
.card {
  border: 1px solid #e7ebf3;
  border-radius: var(--im-card-radius);
}

.kpi-card {
  border-radius: var(--im-card-radius);
  color: #fff;
  padding: 1rem 1.15rem;
  position: relative;
  overflow: hidden;
}

.kpi-card .kpi-icon {
  position: absolute;
  right: .75rem;
  top: .6rem;
  font-size: 2rem;
  opacity: .25;
}

.kpi-card .kpi-value { font-size: 1.6rem; font-weight: 700; }
.kpi-card .kpi-label { font-size: .8rem; opacity: .9; }

.kpi-blue   { background: linear-gradient(135deg, #2455a4, #173b78); }
.kpi-green  { background: linear-gradient(135deg, #1f9d55, #16773f); }
.kpi-orange { background: linear-gradient(135deg, #f5a623, #c9820e); }
.kpi-purple { background: linear-gradient(135deg, #6c4fd6, #4d35a3); }
.kpi-teal   { background: linear-gradient(135deg, #17a2b8, #12798b); }
.kpi-red    { background: linear-gradient(135deg, #d9534f, #a83b38); }

/* ---------- Tables ---------- */
.table-responsive { border-radius: .5rem; overflow: hidden; }
.table thead th {
  background: #eef1f8;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: #56628a;
  border-bottom: none;
  white-space: nowrap;
}
.table td { vertical-align: middle; }

.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: #8b96b3;
}
.empty-state i { font-size: 2.2rem; display: block; margin-bottom: .5rem; }

/* ---------- Badges ---------- */
.badge-status { font-weight: 600; font-size: .72rem; padding: .38em .6em; }
.overdue-row { background-color: #fdecea !important; }

/* ---------- Forms ---------- */
.form-label { font-weight: 600; font-size: .85rem; }
.required-mark { color: #d9534f; }
.form-section-title {
  font-weight: 700;
  font-size: .95rem;
  color: var(--im-primary-dark);
  border-bottom: 1px solid #e4e8f1;
  padding-bottom: .4rem;
  margin: 1.25rem 0 1rem;
}
.form-section-title:first-child { margin-top: 0; }

/* ---------- Misc ---------- */
.filter-card { background: #fff; }
.text-balance-due { color: #d9534f; font-weight: 700; }
.text-balance-clear { color: #1f9d55; font-weight: 700; }

.im-loading-overlay {
  position: fixed; inset: 0; background: rgba(255,255,255,.6);
  display: none; align-items: center; justify-content: center; z-index: 2000;
}
.im-loading-overlay.active { display: flex; }

@media print {
  .im-sidebar, .im-topbar, .no-print { display: none !important; }
  .im-content { padding: 0; }
}

@media (max-width: 991.98px) {
  .im-sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    margin-left: -250px;
    z-index: 1050;
    box-shadow: 4px 0 18px rgba(0,0,0,.25);
  }
  .im-sidebar.show { margin-left: 0; }
  .sidebar-backdrop {
    display: none;
    position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 1040;
  }
  .sidebar-backdrop.show { display: block; }
}