:root {
  --bg-deep: #050a18;
  --bg-card: rgba(10, 20, 45, 0.75);
  --cyan: #00e5ff;
  --cyan-dim: #55ccff;
  --violet: #7000ff;
  --text: #e8f4ff;
  --text-muted: #8ba4c4;
  --danger: #ff4d6d;
  --success: #00e5a0;
  --border: rgba(0, 229, 255, 0.25);
  --glow: 0 0 20px rgba(0, 229, 255, 0.35);
  --radius: 16px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

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

html, body {
  min-height: 100%;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg-deep);
  overflow-x: hidden;
}

body {
  background:
    radial-gradient(ellipse 80% 50% at 20% 20%, rgba(0, 100, 200, 0.25), transparent),
    radial-gradient(ellipse 60% 40% at 80% 70%, rgba(112, 0, 255, 0.2), transparent),
    linear-gradient(180deg, #050a18 0%, #000 100%);
}

.stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 30% 60%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 70% 30%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 90% 80%, rgba(255,255,255,0.4), transparent);
  opacity: 0.6;
}

.app {
  position: relative;
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 16px 40px;
  min-height: 100vh;
}

.logo-wrap {
  text-align: center;
  margin-bottom: 32px;
}

.logo-img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  box-shadow: var(--glow);
  margin-bottom: 12px;
  object-fit: cover;
}

.logo-title {
  font-size: 1.75rem;
  font-weight: 300;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--cyan);
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
}

.logo-sub {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-top: 4px;
}

.card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--glow);
}

.card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--cyan-dim);
}

.card p {
  color: var(--text-muted);
  line-height: 1.5;
  font-size: 0.95rem;
}

.btn {
  display: block;
  width: 100%;
  padding: 14px 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(0, 229, 255, 0.08);
  color: var(--cyan);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: all 0.25s ease;
  margin-bottom: 10px;
}

.btn:last-child {
  margin-bottom: 0;
}

.btn:hover, .btn:active {
  background: rgba(0, 229, 255, 0.18);
  box-shadow: var(--glow);
}

.btn-primary {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.2), rgba(112, 0, 255, 0.15));
  border-color: var(--cyan);
}

.btn-danger {
  border-color: rgba(255, 77, 109, 0.5);
  color: var(--danger);
  background: rgba(255, 77, 109, 0.08);
}

.btn-sm {
  padding: 8px 12px;
  font-size: 0.85rem;
  width: auto;
  display: inline-block;
  margin-right: 6px;
  margin-bottom: 6px;
}

.device-grid {
  display: grid;
  gap: 10px;
}

.device-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
}

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

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

.steps li {
  position: relative;
  padding-left: 36px;
  margin-bottom: 16px;
  color: var(--text-muted);
  line-height: 1.5;
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hidden {
  display: none !important;
}

.screen {
  animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.error-box {
  background: rgba(255, 77, 109, 0.12);
  border: 1px solid rgba(255, 77, 109, 0.4);
  color: var(--danger);
  padding: 12px 16px;
  border-radius: 12px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

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

.back-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  margin-bottom: 16px;
  padding: 4px 0;
}

.back-btn:hover {
  color: var(--cyan);
}

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

.user-item {
  padding: 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
}

.user-item.selected {
  border-color: var(--cyan);
  box-shadow: var(--glow);
}

.user-name {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.user-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-pending { background: rgba(255, 200, 0, 0.15); color: #ffc800; }
.badge-active { background: rgba(0, 229, 160, 0.15); color: var(--success); }
.badge-frozen { background: rgba(112, 0, 255, 0.2); color: #b388ff; }

.form-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.3);
  color: var(--text);
  font-size: 1rem;
  margin-bottom: 12px;
}

.form-input:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: var(--glow);
}

.code-display {
  font-size: 2rem;
  letter-spacing: 0.3em;
  text-align: center;
  color: var(--cyan);
  text-shadow: var(--glow);
  padding: 16px;
  margin: 12px 0;
}

.server-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 6px;
}

.status-dot.ok { background: var(--success); box-shadow: 0 0 8px var(--success); }
.status-dot.fail { background: var(--danger); }

.traffic {
  font-size: 0.8rem;
  color: var(--cyan-dim);
}