:root {
  --bg-dark: #0a0c10;
  --bg-panel: rgba(18, 22, 31, 0.75);
  --bg-card: rgba(26, 32, 44, 0.6);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.5);
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.25);
  
  --accent: #10b981;
  --accent-glow: rgba(16, 185, 129, 0.2);
  --danger: #ef4444;
  --warning: #f59e0b;

  --text-main: #f8fafc;
  --text-dim: #94a3b8;
  --text-muted: #64748b;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background: var(--bg-dark);
  background-image: 
    radial-gradient(at 10% 20%, rgba(99, 102, 241, 0.12) 0px, transparent 50%),
    radial-gradient(at 90% 80%, rgba(16, 185, 129, 0.08) 0px, transparent 50%);
  color: var(--text-main);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Glassmorphism Classes */
.glass-card {
  background: var(--bg-panel);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.36);
}

/* Header & Nav */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-glass);
  background: rgba(10, 12, 16, 0.8);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-badge {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-size: 1.4rem;
  box-shadow: 0 0 20px var(--primary-glow);
}

.logo-badge.sm {
  width: 34px;
  height: 34px;
  font-size: 1.1rem;
}

.nav-tabs {
  display: flex;
  gap: 8px;
  padding: 0.75rem 2rem;
  border-bottom: 1px solid var(--border-glass);
  background: rgba(18, 22, 31, 0.4);
  overflow-x: auto;
}

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-dim);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
}

.tab-btn.active {
  color: #fff;
  background: var(--primary-glow);
  border-color: rgba(99, 102, 241, 0.4);
}

/* Layout */
.content-container {
  max-width: 1200px;
  width: 100%;
  margin: 1.5rem auto;
  padding: 0 1.5rem;
  flex: 1;
}

.tab-pane {
  display: none;
  animation: fadeIn 0.2s ease forwards;
}

.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.pane-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

.split-panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .split-panes {
    grid-template-columns: 1fr;
  }
}

/* Item Cards */
.user-card, .device-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.user-card:hover, .device-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.16);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: #fff;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  border-top: 1px solid var(--border-glass);
  padding-top: 0.75rem;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
  font-family: var(--font-mono);
}

.badge-accent {
  background: var(--accent-glow);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-primary {
  background: var(--primary-glow);
  color: #818cf8;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-dim {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-dim);
  border: 1px solid var(--border-glass);
}

/* Form Controls */
label {
  display: block;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 6px;
  font-weight: 500;
}

input[type="text"],
input[type="password"],
input[type="number"],
select,
textarea {
  width: 100%;
  background: rgba(15, 18, 25, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.65rem 0.85rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

textarea {
  line-height: 1.5;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-check-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 1rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  color: var(--text-main);
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 10px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 10px var(--accent-glow);
}

.btn-accent:hover {
  filter: brightness(1.1);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.25);
}

.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border-glass);
}

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

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}

.btn-group {
  display: flex;
  gap: 8px;
}

/* Auth / Overlay */
.auth-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5, 7, 10, 0.85);
  backdrop-filter: blur(12px);
  z-index: 999;
}

.login-card {
  width: 100%;
  max-width: 420px;
  padding: 2.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 2rem;
}

.subtitle {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.input-group {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}

.error-msg {
  color: #fca5a5;
  font-size: 0.85rem;
  margin-top: 8px;
  min-height: 1.2rem;
}

.sync-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.sync-dot.ready {
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.modal-card {
  width: 90%;
  max-width: 540px;
  max-height: 90vh;
  overflow-y: auto;
}

/* Code box */
.code-box {
  background: #000;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-top: 0.75rem;
  overflow-x: auto;
}

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #1e293b;
  border: 1px solid var(--border-glass);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  z-index: 1000;
  transition: opacity 0.2s, transform 0.2s;
}

.hidden {
  display: none !important;
}

.text-dim { color: var(--text-dim); }
.text-sm { font-size: 0.85rem; }
.mt-3 { margin-top: 0.75rem; }