/* ── Variables ─────────────────────────────────────────────────────────────── */
:root {
  --color-bg: #f5f6fa;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-primary: #25d366;
  --color-primary-dark: #1da851;
  --color-danger: #e53e3e;
  --color-warning: #f6ad55;
  --color-success: #48bb78;
  --color-text: #2d3748;
  --color-text-muted: #718096;
  --color-sidebar: #1a1a2e;
  --color-sidebar-text: #e2e8f0;
  --color-sidebar-active: #25d366;

  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
}

/* ── Reset ─────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  display: flex;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; font: inherit; }

/* ── Layout ────────────────────────────────────────────────────────────────── */
.sidebar {
  width: 256px;
  height: 100vh;
  background: #0f172a;
  color: #94a3b8;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  border-right: 1px solid #1e293b;
}
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.brand-icon-wrap {
  width: 34px;
  height: 34px;
  background: var(--color-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.brand-icon-wrap .pi { color: #fff; font-size: 1rem; }
.brand-name { font-size: 0.9rem; font-weight: 700; color: #e2e8f0; letter-spacing: 0.01em; }
.nav-list { flex: 1; padding: 10px 8px; overflow-y: auto; }
.nav-list li { list-style: none; }
.nav-list li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  margin: 1px 0;
  transition: background 0.15s, color 0.15s;
  color: #64748b;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
}
.nav-list li a .pi { font-size: 0.95rem; width: 16px; text-align: center; flex-shrink: 0; }
.nav-list li a:hover { background: rgba(255,255,255,0.06); color: #cbd5e1; }
.nav-list li a.active {
  background: rgba(37,211,102,0.12);
  color: #25d366;
  font-weight: 600;
}
.nav-list li a.active .pi { color: #25d366; }
.sidebar-footer { padding: 10px 8px; border-top: 1px solid rgba(255,255,255,0.06); }
.btn-logout {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: #64748b;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
  cursor: pointer;
}
.btn-logout .pi { font-size: 0.95rem; width: 16px; text-align: center; flex-shrink: 0; }
.btn-logout:hover { background: rgba(239,68,68,0.12); color: #f87171; }

.main-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}
.page-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-xl);
  flex-shrink: 0;
}
.page-header h1 { font-size: 1.25rem; font-weight: 700; }
.page-body {
  padding: var(--spacing-xl);
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

/* ── Cards ─────────────────────────────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow);
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--spacing-md);
}
.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow);
}
.stat-card .stat-value { font-size: 2rem; font-weight: 700; color: var(--color-primary); }
.stat-card .stat-label { font-size: 0.85rem; color: var(--color-text-muted); margin-top: var(--spacing-xs); }

/* ── Status badges ─────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.badge-connected { background: #c6f6d5; color: #276749; }
.badge-disconnected { background: #fed7d7; color: #9b2c2c; }
.badge-connecting { background: #fef3c7; color: #92400e; }
.badge-qr_pending { background: #bee3f8; color: #2b6cb0; }

/* ── Table ─────────────────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th {
  text-align: left;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg);
  border-bottom: 2px solid var(--color-border);
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--color-bg); }

/* ── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: opacity 0.15s, background 0.15s;
}
.btn:hover { opacity: 0.85; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-secondary { background: var(--color-bg); border-color: var(--color-border); color: var(--color-text); }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 0.8rem; }

/* ── Forms ─────────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: var(--spacing-md); }
.form-group label { display: block; margin-bottom: var(--spacing-xs); font-size: 0.875rem; font-weight: 500; }
.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font: inherit;
  background: var(--color-surface);
  transition: border-color 0.15s;
}
.form-control:focus { outline: none; border-color: var(--color-primary); }

/* ── Login page ────────────────────────────────────────────────────────────── */
.login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: #f1f5f9;
}
.login-card {
  background: #ffffff;
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 4px 32px rgba(15,23,42,0.08), 0 1px 4px rgba(15,23,42,0.04);
}
.login-card-header { text-align: center; margin-bottom: 32px; }
.login-logo {
  width: 52px;
  height: 52px;
  background: var(--color-primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.login-logo .pi { color: #fff; font-size: 1.4rem; }
.login-card-header h1 { font-size: 1.4rem; font-weight: 700; color: #0f172a; margin-bottom: 6px; }
.login-card-header p { font-size: 0.875rem; color: #64748b; }
.input-icon-wrapper { position: relative; }
.input-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: #94a3b8;
  font-size: 0.875rem;
  pointer-events: none;
}
.form-control-icon { padding-left: 38px !important; }
.btn-login {
  width: 100%;
  justify-content: center;
  padding: 10px 20px;
  margin-top: 4px;
  font-size: 0.9rem;
  gap: 8px;
}
.btn-login .pi { font-size: 0.875rem; }
.alert { padding: var(--spacing-sm) var(--spacing-md); border-radius: var(--radius); font-size: 0.875rem; margin-bottom: var(--spacing-md); }
.alert-error { background: #fff5f5; border: 1px solid #fed7d7; color: var(--color-danger); }

/* ── QR modal ──────────────────────────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow-md);
}
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--spacing-lg); }
.modal-title { font-size: 1.1rem; font-weight: 700; }
.modal-close { background: none; border: none; font-size: 1.5rem; color: var(--color-text-muted); }
.qr-container { text-align: center; padding: var(--spacing-lg) 0; }
.qr-container img { max-width: 280px; border: 4px solid var(--color-border); border-radius: var(--radius); }
.qr-hint { font-size: 0.8rem; color: var(--color-text-muted); margin-top: var(--spacing-md); }

/* ── Circuit breaker banner ────────────────────────────────────────────────── */
.circuit-breaker-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
  transform: translateY(-100%);
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0;
  pointer-events: none;
}
.circuit-breaker-banner.visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.circuit-breaker-banner--open {
  background: #fef2f2;
  border-bottom: 2px solid #fca5a5;
  color: #991b1b;
}
.circuit-breaker-banner--open .pi {
  color: #dc2626;
}
.circuit-breaker-banner--recovered {
  background: #f0fdf4;
  border-bottom: 2px solid #86efac;
  color: #166534;
}
.circuit-breaker-banner--recovered .pi {
  color: #16a34a;
}
.circuit-breaker-banner__spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid #fca5a5;
  border-top-color: #dc2626;
  border-radius: 50%;
  animation: cb-spin 0.8s linear infinite;
}
@keyframes cb-spin {
  to { transform: rotate(360deg); }
}

/* ── Utilities ─────────────────────────────────────────────────────────────── */
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.text-muted { color: var(--color-text-muted); }
.text-sm { font-size: 0.875rem; }
.empty-state { text-align: center; padding: var(--spacing-xl); color: var(--color-text-muted); }