:root {
  --app-bg: #f4f6f8;
  --app-surface: #ffffff;
  --app-border: #dfe5ec;
  --app-text: #19212a;
  --app-muted: #657282;
  --app-primary: #2454d6;
  --app-primary-soft: #edf3ff;
  --app-shadow: 0 10px 30px rgba(20, 31, 46, .06);
}

html { min-height: 100%; }

body {
  min-height: 100%;
  background: var(--app-bg);
  color: var(--app-text);
  font-size: 15px;
}

.app-nav {
  background: rgba(255, 255, 255, .96) !important;
  border-bottom: 1px solid var(--app-border);
  box-shadow: 0 1px 0 rgba(17, 24, 39, .02);
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  letter-spacing: 0;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--app-primary);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
}

.navbar .nav-link {
  border-radius: 7px;
  color: #4b5563;
  margin: 0 .05rem;
  padding: .45rem .7rem;
}

.navbar .nav-link:hover {
  background: #f0f3f7;
  color: var(--app-text);
}

.navbar .nav-link.active {
  background: var(--app-primary-soft);
  color: var(--app-primary);
  font-weight: 600;
}

.app-main {
  max-width: 1440px;
}

.auth-card {
  max-width: 430px;
  margin: 9vh auto;
  background: var(--app-surface);
  border: 1px solid var(--app-border);
  border-radius: 8px;
  padding: 28px;
  box-shadow: var(--app-shadow);
}

.narrow { max-width: 760px; }

h1, h2, h3, h4, h5 { letter-spacing: 0; }

.text-secondary { color: var(--app-muted) !important; }

.stat {
  background: var(--app-surface);
  border: 1px solid var(--app-border);
  border-radius: 8px;
  padding: 20px;
  min-height: 112px;
  box-shadow: var(--app-shadow);
}

.stat .fs-3,
.stat .fs-4 {
  color: #111827;
}

.table-card {
  background: var(--app-surface);
  border: 1px solid var(--app-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--app-shadow);
}

.table-card .table { margin-bottom: 0; }

.table thead th {
  background: #f8fafc;
  color: #536172;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .04em;
  border-bottom-color: var(--app-border);
}

.table tbody td {
  color: #26313d;
  vertical-align: middle;
}

.table-hover tbody tr:hover { --bs-table-hover-bg: #f8fbff; }

.form-control,
.form-select {
  border-color: #d7dee7;
  border-radius: 7px;
}

.form-control:focus,
.form-select:focus {
  border-color: #7ea0f4;
  box-shadow: 0 0 0 .2rem rgba(36, 84, 214, .12);
}

.btn {
  border-radius: 7px;
  font-weight: 600;
}

.btn-primary {
  --bs-btn-bg: var(--app-primary);
  --bs-btn-border-color: var(--app-primary);
  --bs-btn-hover-bg: #1f49ba;
  --bs-btn-hover-border-color: #1f49ba;
}

.btn-outline-primary {
  --bs-btn-color: var(--app-primary);
  --bs-btn-border-color: #9cb4f4;
  --bs-btn-hover-bg: var(--app-primary);
  --bs-btn-hover-border-color: var(--app-primary);
}

.alert {
  border: 1px solid var(--app-border);
  border-radius: 8px;
}

.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.badge {
  border-radius: 999px;
  font-weight: 600;
}

.badge-soft {
  background: var(--app-primary-soft);
  color: #24459a;
}

textarea.form-control { min-height: 120px; }

.language-form .form-select {
  width: auto;
  min-width: 118px;
}

pre { border: 1px solid var(--app-border); }

@media (max-width: 991.98px) {
  .app-main {
    padding-left: 16px !important;
    padding-right: 16px !important;
  }

  .language-form {
    margin: .75rem 0;
  }
}