* { box-sizing: border-box; }
:root {
  --nx-primary: #0B5FFF;
  --nx-secondary: #00C2A8;
  --nx-bg: #F4F6FA;
  --nx-panel: #FFFFFF;
  --nx-text: #1B2430;
  --nx-muted: #6B7686;
  --nx-border: #E3E7EE;
  --nx-danger: #E74C3C;
  --nx-success: #2ECC71;
  --nx-warn: #F5A623;
}
html, body {
  margin: 0; padding: 0; font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--nx-bg); color: var(--nx-text);
}
a { color: var(--nx-primary); text-decoration: none; }

/* ---------- Login ---------- */
.login-body { display: flex; align-items: center; justify-content: center; height: 100vh; background: linear-gradient(135deg, #0B0F1A, #142140); }
.login-card {
  background: var(--nx-panel); padding: 2.6rem 2.4rem; border-radius: 16px;
  width: 100%; max-width: 380px; box-shadow: 0 20px 60px rgba(0,0,0,0.35);
  text-align: center;
}
.login-logo { height: 48px; margin-bottom: 1rem; }
.login-card h1 { margin: 0 0 0.2rem 0; font-size: 1.5rem; }
.login-sub { color: var(--nx-muted); margin-top: 0; margin-bottom: 1.6rem; font-size: 0.9rem; }
.login-card form { display: flex; flex-direction: column; gap: 1rem; text-align: left; }
.login-card label { font-size: 0.85rem; color: var(--nx-muted); display: flex; flex-direction: column; gap: 0.35rem; }
.login-card input { padding: 0.65rem 0.75rem; border: 1px solid var(--nx-border); border-radius: 8px; font-size: 0.95rem; }
.login-card button, .btn-primary {
  background: var(--nx-primary); color: #fff; border: none; padding: 0.7rem 1rem;
  border-radius: 8px; font-size: 0.95rem; cursor: pointer; font-weight: 600;
}
.login-footer { margin-top: 1.5rem; font-size: 0.75rem; color: var(--nx-muted); }
.alert { padding: 0.6rem 0.8rem; border-radius: 8px; font-size: 0.85rem; margin-bottom: 1rem; }
.alert-error { background: #FDEDEC; color: var(--nx-danger); }
.alert-success { background: #EAFAF1; color: #1E8449; }
.alert-warn { background: #FEF5E7; color: #B9770E; }

/* ---------- Admin shell ---------- */
.admin-shell { display: flex; min-height: 100vh; align-items: flex-start; }
.admin-sidebar {
  width: 240px; background: #101826; color: #fff; display: flex; flex-direction: column;
  padding: 1.4rem 1rem; flex-shrink: 0;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.admin-brand { display: flex; align-items: center; gap: 0.6rem; padding: 0 0.5rem 1.4rem 0.5rem; border-bottom: 1px solid rgba(255,255,255,0.1); margin-bottom: 1rem; }
.admin-brand img { height: 28px; }
.admin-brand span { font-weight: 600; font-size: 0.95rem; }
.admin-sidebar nav { display: flex; flex-direction: column; gap: 0.2rem; flex: 1; }
.admin-sidebar nav a { color: rgba(255,255,255,0.75); padding: 0.6rem 0.7rem; border-radius: 8px; font-size: 0.9rem; }
.admin-sidebar nav a:hover { background: rgba(255,255,255,0.06); }
.admin-sidebar nav a.nav-active { background: var(--nx-primary); color: #fff; }
.admin-logout { display: flex; flex-direction: column; gap: 0.5rem; padding-top: 1rem; border-top: 1px solid rgba(255,255,255,0.1); font-size: 0.8rem; color: rgba(255,255,255,0.6); }
.admin-logout button { background: transparent; border: 1px solid rgba(255,255,255,0.2); color: #fff; padding: 0.4rem; border-radius: 6px; cursor: pointer; }

.admin-main { flex: 1; padding: 2rem 2.4rem; max-width: 1400px; }
.admin-main h1 { margin-top: 0; }
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.6rem; }
.page-header p.subtitle { color: var(--nx-muted); margin: 0.2rem 0 0 0; }

.panel { background: var(--nx-panel); border: 1px solid var(--nx-border); border-radius: 12px; padding: 1.4rem 1.6rem; margin-bottom: 1.4rem; }
.panel h2 { margin-top: 0; font-size: 1.05rem; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 0.65rem 0.7rem; border-bottom: 1px solid var(--nx-border); font-size: 0.9rem; }
th { color: var(--nx-muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.4px; }
tr:hover td { background: #FAFBFD; }

.badge { display: inline-block; padding: 0.15rem 0.55rem; border-radius: 999px; font-size: 0.72rem; font-weight: 600; }
.badge-up { background: #EAFAF1; color: #1E8449; }
.badge-down { background: #FDEDEC; color: #C0392B; }
.badge-degraded { background: #FEF5E7; color: #B9770E; }
.badge-role { background: #EEF2FF; color: #3B4CCA; }

.btn { display: inline-block; padding: 0.45rem 0.85rem; border-radius: 7px; font-size: 0.85rem; cursor: pointer; border: 1px solid var(--nx-border); background: #fff; color: var(--nx-text); }
.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.78rem; }
.btn-danger { color: var(--nx-danger); border-color: #F5C6C0; }
.btn-primary { background: var(--nx-primary); color: #fff; border: none; }
.btn-row { display: flex; gap: 0.6rem; margin-top: 1rem; }

form.stacked { display: flex; flex-direction: column; gap: 1rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-grid.single { grid-template-columns: 1fr; }
.form-group { display: flex; flex-direction: column; gap: 0.35rem; }
.form-group label { font-size: 0.82rem; font-weight: 600; color: var(--nx-muted); }
.form-group input, .form-group select, .form-group textarea {
  padding: 0.55rem 0.7rem; border: 1px solid var(--nx-border); border-radius: 7px; font-size: 0.9rem;
}
.form-hint { font-size: 0.75rem; color: var(--nx-muted); margin-top: -0.2rem; }
.checkbox-row { display: flex; align-items: center; gap: 0.5rem; font-size: 0.88rem; }
.section-divider { border: none; border-top: 1px solid var(--nx-border); margin: 1.6rem 0; }

.color-swatch { width: 22px; height: 22px; border-radius: 6px; display: inline-block; vertical-align: middle; margin-right: 0.4rem; border: 1px solid rgba(0,0,0,0.1); }
.logo-preview { max-height: 60px; max-width: 220px; border: 1px dashed var(--nx-border); border-radius: 8px; padding: 0.5rem; }

.log-viewer { background: #101826; color: #C7D3E0; font-family: 'Consolas', 'Menlo', monospace; font-size: 0.78rem; padding: 1rem; border-radius: 10px; max-height: 520px; overflow: auto; white-space: pre-wrap; }
.log-file-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1rem; }
.log-file-list a { padding: 0.3rem 0.6rem; border-radius: 6px; background: #EEF2FF; font-size: 0.8rem; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin-bottom: 1.6rem; }
.stat-card { background: var(--nx-panel); border: 1px solid var(--nx-border); border-radius: 12px; padding: 1.1rem 1.3rem; }
.stat-card .stat-value { font-size: 1.8rem; font-weight: 700; }
.stat-card .stat-label { color: var(--nx-muted); font-size: 0.8rem; }