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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --border: #2a2d3a;
  --accent: #6c63ff;
  --text: #e2e8f0;
  --muted: #64748b;
  --success: #22c55e;
  --error: #ef4444;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.container {
  width: 100%;
  max-width: 640px;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--accent);
}

.subtitle {
  color: var(--muted);
  margin-top: 0.25rem;
  font-size: 0.9rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.card h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 1rem;
}

.info-grid {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.info-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.label {
  color: var(--muted);
  font-size: 0.875rem;
  flex-shrink: 0;
}

.value {
  font-size: 0.875rem;
  text-align: right;
  word-break: break-all;
}

.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.5rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}

.btn:hover { opacity: 0.85; }
.btn:active { opacity: 0.7; }

.result {
  margin-top: 0.75rem;
  padding: 0.75rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-family: monospace;
  background: var(--bg);
  border: 1px solid var(--border);
}

.result.success { border-color: var(--success); color: var(--success); }
.result.error   { border-color: var(--error);   color: var(--error); }
.hidden { display: none; }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 1.5rem;
}