:root {
  --bg: #101112;
  --card: #1a1b1d;
  --border: #2c2d30;
  --text: #e8e8e9;
  --muted: #9a9b9e;
  --accent: #e8e8e9;
  --accent-hover: #ffffff;
  --accent-text: #101112;
  --success: #4caf6d;
  --error: #e5534b;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  line-height: 1.5;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 28px;
  width: 100%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

.brand {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.brand span {
  color: var(--accent);
}

.subtitle {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 24px;
}

.state {
  display: none;
}

.state.active {
  display: block;
}

h1 {
  font-size: 18px;
  margin: 12px 0 8px;
}

p {
  color: var(--muted);
  font-size: 14px;
  margin: 8px 0;
}

.btn {
  display: inline-block;
  width: 100%;
  border: none;
  border-radius: 10px;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  cursor: pointer;
  margin-top: 16px;
  transition: background 0.15s ease;
}

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

.btn:disabled {
  opacity: 0.6;
  cursor: default;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin: 8px auto;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.icon {
  font-size: 40px;
  line-height: 1;
  margin-bottom: 4px;
}

.icon.success {
  color: var(--success);
}

.icon.error {
  color: var(--error);
}

.footer {
  margin-top: 24px;
  font-size: 12px;
  color: var(--muted);
}