:root {
  --bg-primary: #0a1628;
  --bg-secondary: #0f2140;
  --bg-card: #132847;
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.35);
  --text-primary: #e8f0fe;
  --text-secondary: #94a3b8;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius: 16px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font);
  background: linear-gradient(160deg, var(--bg-primary) 0%, #061020 50%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  min-height: 100vh;
  padding: 16px;
  padding-bottom: 32px;
}

.container {
  max-width: 420px;
  margin: 0 auto;
}

.logo-block {
  text-align: center;
  padding: 24px 0 20px;
}

.logo-img {
  width: 160px;
  height: auto;
  margin: 0 auto 12px;
  display: block;
  border-radius: 16px;
}

.logo-img-sm {
  width: 120px;
}

.logo-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 12px;
  background: linear-gradient(135deg, var(--accent) 0%, #1d4ed8 100%);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 32px var(--accent-glow);
}

.logo-icon svg {
  width: 40px;
  height: 40px;
}

.logo-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.logo-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 4px;
}

.card {
  background: var(--bg-card);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.card h2 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--accent-light);
}

.card p {
  color: var(--text-secondary);
  line-height: 1.5;
  font-size: 0.925rem;
}

.device-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.device-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 16px 18px;
  background: var(--bg-secondary);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
}

.device-btn:hover, .device-btn:active {
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.12);
}

.device-btn .icon {
  font-size: 1.5rem;
}

.step-list {
  list-style: none;
  counter-reset: steps;
}

.step-list li {
  counter-increment: steps;
  position: relative;
  padding-left: 36px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.5;
  font-size: 0.925rem;
}

.step-list li::before {
  content: counter(steps);
  position: absolute;
  left: 0;
  top: 0;
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px 20px;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #2563eb 100%);
  color: white;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:hover, .btn-primary:active {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.btn-sm {
  padding: 10px 14px;
  font-size: 0.875rem;
}

.btn.disabled,
.btn:disabled {
  opacity: 0.55;
  pointer-events: none;
  cursor: default;
  transform: none;
  box-shadow: none;
}

.hidden {
  display: none !important;
}

.error-msg {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 0.875rem;
}

.success-msg {
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #86efac;
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 0.875rem;
}

.back-btn {
  background: none;
  border: none;
  color: var(--accent-light);
  font-size: 0.875rem;
  cursor: pointer;
  padding: 8px 0;
  margin-bottom: 12px;
}

.store-links a {
  color: var(--accent-light);
  text-decoration: none;
  font-size: 0.875rem;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-frozen {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
}

.badge-active {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-secondary);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 1rem;
}

.user-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.user-item {
  background: var(--bg-secondary);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: 12px;
  padding: 14px;
  cursor: pointer;
  transition: border-color 0.2s;
}

.user-item:hover {
  border-color: var(--accent);
}

.user-item .name {
  font-weight: 600;
  margin-bottom: 4px;
}

.user-item .meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.user-detail .stat-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-size: 0.875rem;
}

.user-detail .stat-row span:last-child {
  color: var(--accent-light);
}

.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

.code-display {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-light);
  padding: 16px;
  background: var(--bg-secondary);
  border-radius: 12px;
  margin: 12px 0;
}

.invite-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-size: 0.875rem;
}

.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-secondary);
}

.version-badge {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  padding: 8px 12px;
  text-align: center;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: #93c5fd;
  background: rgba(10, 22, 40, 0.92);
  border-top: 1px solid rgba(59, 130, 246, 0.25);
  backdrop-filter: blur(6px);
}

body {
  padding-bottom: 48px;
}