:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --border: #2d3a4d;
  --text: #e7ecf3;
  --muted: #8b9cb3;
  --accent: #3d8bfd;
  --success: #34c759;
  --danger: #ff453a;
  --warn: #ffd60a;
  --radius: 12px;
  --font: "Segoe UI", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: radial-gradient(ellipse 120% 80% at 50% -20%, #1e3a5f 0%, var(--bg) 55%);
  color: var(--text);
  line-height: 1.5;
}

.app {
  max-width: 420px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.header {
  text-align: center;
  margin-bottom: 1.25rem;
}

.header h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0.35rem 0 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.card-title {
  margin: 0 0 0.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hint {
  margin: 0 0 1rem;
  font-size: 0.8125rem;
  color: var(--muted);
}

.fields {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.8125rem;
  color: var(--muted);
}

.optional {
  font-weight: 400;
  opacity: 0.8;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(61, 139, 253, 0.25);
}

.actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.btn {
  flex: 1;
  min-width: 100px;
  padding: 0.65rem 1rem;
  border: none;
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: opacity 0.15s, transform 0.1s;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn:not(:disabled):active {
  transform: scale(0.98);
}

.btn.primary {
  background: var(--accent);
  color: #fff;
}

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

.status-card .status-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9375rem;
  font-weight: 500;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--muted);
  flex-shrink: 0;
}

.status-dot.registering {
  background: var(--warn);
  animation: pulse 1s ease infinite;
}

.status-dot.registered {
  background: var(--success);
  box-shadow: 0 0 10px rgba(52, 199, 89, 0.5);
}

.status-dot.error {
  background: var(--danger);
}

@keyframes pulse {
  50% {
    opacity: 0.5;
  }
}

.log-card .log {
  margin: 0;
  max-height: 160px;
  overflow: auto;
  font-size: 0.75rem;
  color: var(--muted);
  white-space: pre-wrap;
  word-break: break-word;
}

audio {
  display: none;
}