:root {
  --bg-main: #0a0e17;
  --bg-sidebar: #0f172a;
  --bg-card: #141e33;
  --bg-card-hover: #1c2a47;
  --bg-input: #0b1120;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: #06b6d4;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-indigo: #6366f1;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.15);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  overflow-x: hidden;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: #25334d;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-cyan);
}

/* App Layout */
#app-container {
  display: flex;
  width: 100vw;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.sidebar-header {
  padding: 24px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
}

.logo-badge {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.2rem;
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #fff, var(--text-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 0.72rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.nav-menu {
  list-style: none;
  padding: 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.04);
  color: #fff;
}

.nav-item.active {
  background: linear-gradient(90deg, rgba(6, 182, 212, 0.15), rgba(99, 102, 241, 0.05));
  color: var(--accent-cyan);
  border-left: 3px solid var(--accent-cyan);
}

.nav-icon {
  font-size: 1.1rem;
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0.15);
}

.admin-info {
  display: flex;
  flex-direction: column;
}

.admin-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
}

.admin-role {
  font-size: 0.72rem;
  color: var(--text-dim);
}

.btn-logout {
  background: transparent;
  border: none;
  color: var(--accent-rose);
  cursor: pointer;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
  font-size: 0.85rem;
}

.btn-logout:hover {
  background: rgba(244, 63, 94, 0.15);
}

/* Main Content */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  max-height: 100vh;
}

.topbar {
  padding: 18px 32px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.page-heading {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.topbar-actions {
  display: flex;
  gap: 12px;
}

.content-body {
  padding: 32px;
  flex: 1;
}

/* Cards & Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 22px;
  display: flex;
  align-items: center;
  gap: 18px;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s, border-color 0.2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.15);
}

.stat-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.stat-icon.cyan { background: rgba(6, 182, 212, 0.15); color: var(--accent-cyan); }
.stat-icon.emerald { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); }
.stat-icon.amber { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }
.stat-icon.indigo { background: rgba(99, 102, 241, 0.15); color: var(--accent-indigo); }

.stat-val {
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #fff;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Section Box */
.section-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  margin-bottom: 30px;
}

.section-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
}

.section-title {
  font-size: 1.05rem;
  font-weight: 700;
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

.data-table th {
  padding: 14px 20px;
  background: rgba(0, 0, 0, 0.2);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  vertical-align: middle;
}

.data-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-online { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-offline { background: rgba(100, 116, 139, 0.15); color: var(--text-dim); border: 1px solid rgba(100, 116, 139, 0.3); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-danger { background: rgba(244, 63, 94, 0.15); color: var(--accent-rose); border: 1px solid rgba(244, 63, 94, 0.3); }
.badge-cyan { background: rgba(6, 182, 212, 0.15); color: var(--accent-cyan); border: 1px solid rgba(6, 182, 212, 0.3); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), #0284c7);
  color: #fff;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.25);
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 6px 16px rgba(6, 182, 212, 0.35);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-danger {
  background: rgba(244, 63, 94, 0.15);
  border-color: rgba(244, 63, 94, 0.3);
  color: var(--accent-rose);
}

.btn-danger:hover {
  background: rgba(244, 63, 94, 0.3);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.78rem;
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 650px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  animation: modalSlide 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlide {
  from { transform: translateY(20px) scale(0.96); }
  to { transform: translateY(0) scale(1); }
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close:hover { color: #fff; }

.modal-body {
  padding: 24px;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  background: rgba(0, 0, 0, 0.15);
}

/* Form Controls */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: #fff;
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Contacts Sub-list in Modal */
.contact-item-row {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 12px;
  position: relative;
}

/* Token Box */
.token-display-box {
  background: #070a11;
  border: 1px dashed var(--accent-cyan);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-family: monospace;
  font-size: 1rem;
  color: var(--accent-cyan);
  display: flex;
  justify-content: space-between;
  align-items: center;
  word-break: break-all;
}

/* Toast Notifications */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-cyan);
  padding: 14px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  font-size: 0.88rem;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 12px;
  animation: toastIn 0.3s ease;
  min-width: 280px;
}

.toast.success { border-left-color: var(--accent-emerald); }
.toast.error { border-left-color: var(--accent-rose); }
.toast.warning { border-left-color: var(--accent-amber); }

@keyframes toastIn {
  from { transform: translateX(50px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Login Screen Overlay */
#login-view {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, #111a2f 0%, #060911 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.login-card {
  width: 90%;
  max-width: 400px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  text-align: center;
}