:root {
  --app-sidebar-width: 250px;
  --app-bg: #f4f6fb;
  --app-sidebar-bg: #16203a;
  --app-sidebar-bg-2: #111a2f;
  --app-sidebar-color: #aab4cf;
  --app-primary: #4f46e5;
  --app-primary-rgb: 79, 70, 229;
  --app-border: #e6e9f2;
  --app-text: #1f2a44;
  --app-muted: #6b7592;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 15px;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--app-bg);
  color: var(--app-text);
  font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

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

/* ----- Sidebar ----- */
.app-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--app-sidebar-width);
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, var(--app-sidebar-bg) 0%, var(--app-sidebar-bg-2) 100%);
  color: var(--app-sidebar-color);
  z-index: 1040;
}

.app-sidebar__brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: 1.15rem 1.25rem;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: .3px;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, .06);
}

.app-sidebar__brand i {
  color: var(--app-primary);
  font-size: 1.4rem;
}

.app-nav {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: .15rem;
  padding: .75rem .65rem;
}

.app-nav__heading {
  font-size: .68rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: rgba(255, 255, 255, .3);
  padding: .9rem .85rem .35rem;
}

.app-nav__link {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .65rem .85rem;
  border-radius: .55rem;
  color: var(--app-sidebar-color);
  text-decoration: none;
  font-weight: 500;
  transition: background-color .15s ease, color .15s ease;
}

.app-nav__link i {
  width: 1.25rem;
  font-size: 1.1rem;
  text-align: center;
}

.app-nav__link:hover {
  background: rgba(255, 255, 255, .06);
  color: #fff;
}

.app-nav__link.active {
  background: var(--app-primary);
  color: #fff;
  box-shadow: 0 6px 16px rgba(var(--app-primary-rgb), .35);
}

.app-sidebar__footer {
  padding: 1rem 1.25rem;
  font-size: .78rem;
  color: rgba(255, 255, 255, .35);
}

/* ----- Main ----- */
.app-main {
  flex-grow: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  margin-left: var(--app-sidebar-width);
}

.app-topbar {
  position: sticky;
  top: 0;
  z-index: 1020;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .85rem 1.5rem;
  background: #fff;
  border-bottom: 1px solid var(--app-border);
}

.app-topbar__title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--app-text);
}

.app-topbar__spacer {
  flex-grow: 1;
}

.app-topbar__date {
  font-size: .85rem;
}

.app-content {
  padding: 1.5rem;
}

/* ----- Page header ----- */
.page-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 1.25rem;
}

.page-header h2,
.page-header__title {
  margin: 0;
  font-size: 1.4rem;
  font-weight: 600;
}

.page-header > div:first-child {
  margin-right: auto;
}

.page-header__subtitle {
  color: var(--app-muted);
  font-size: .9rem;
}

/* ----- Cards ----- */
.card {
  border: 1px solid var(--app-border);
  border-radius: .7rem;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .04);
}

.card-header {
  background: #fff;
  border-bottom: 1px solid var(--app-border);
  font-weight: 600;
  padding: .9rem 1.1rem;
}

/* ----- Stat cards ----- */
.stat-card__icon {
  width: 48px;
  height: 48px;
  border-radius: .65rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.stat-card__value {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.1;
}

.stat-card__label {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--app-muted);
}

/* ----- Tables ----- */
.table {
  color: var(--app-text);
}

.table > thead {
  background: #f7f8fc;
}

.table > thead th {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  font-weight: 600;
  color: var(--app-muted);
  border-bottom: 1px solid var(--app-border);
}

.table > tbody td {
  vertical-align: middle;
}

/* ----- Buttons & forms ----- */
.btn-primary {
  background-color: var(--app-primary);
  border-color: var(--app-primary);
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active {
  background-color: #4338ca;
  border-color: #4338ca;
}

.btn:focus,
.btn:active:focus,
.form-control:focus,
.form-select:focus,
.form-check-input:focus {
  box-shadow: 0 0 0 .2rem rgba(var(--app-primary-rgb), .2);
}

.form-control:focus,
.form-select:focus {
  border-color: var(--app-primary);
}

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

a {
  color: var(--app-primary);
}

.badge {
  font-weight: 600;
  padding: .35em .6em;
}

/* ----- Empty state ----- */
.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--app-muted);
}

.empty-state i {
  display: block;
  margin-bottom: .5rem;
  font-size: 2rem;
  opacity: .5;
}

/* ----- Responsive sidebar ----- */
.app-sidebar__backdrop {
  display: none;
}

@media (max-width: 991.98px) {
  .app-sidebar {
    transform: translateX(-100%);
    transition: transform .25s ease;
  }

  .app-sidebar.show {
    transform: translateX(0);
  }

  .app-main {
    margin-left: 0;
  }

  .app-sidebar__backdrop.show {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .4);
    z-index: 1035;
  }
}

/* ----- Topbar user ----- */
.app-topbar__user {
  display: flex;
  align-items: center;
  gap: .6rem;
}

.app-topbar__avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(var(--app-primary-rgb), .12);
  color: var(--app-primary);
  font-weight: 700;
}

.app-topbar__username {
  font-weight: 600;
  font-size: .9rem;
}

/* ----- Auth pages ----- */
.auth-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--app-sidebar-bg) 0%, var(--app-sidebar-bg-2) 100%);
  padding: 1.5rem;
}

.auth-wrapper {
  width: 100%;
  max-width: 420px;
}

.auth-card {
  background: #fff;
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, .3);
}

.auth-card__brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--app-text);
  margin-bottom: 1.5rem;
}

.auth-card__brand i {
  color: var(--app-primary);
  font-size: 1.5rem;
}

.auth-card__header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.auth-card__title {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0;
}

.auth-card__subtitle {
  color: var(--app-muted);
  font-size: .9rem;
  margin: .35rem 0 0;
}