:root {
  --fg: #1f2937;
  --bg: #f9fafb;
  --card-bg: #ffffff;
  --accent: #4338ca;
  --accent-hover: #3730a3;
  --border: #e5e7eb;
  --muted: #6b7280;
  --green: #16a34a;
  --red: #dc2626;
  --amber: #d97706;
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

header h1 {
  margin: 0;
  font-size: 1.25rem;
}

nav {
  display: flex;
  gap: 1rem;
}

nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

nav a:hover, nav a.current {
  background: var(--bg);
  color: var(--accent);
}

main {
  max-width: 800px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.05rem;
  color: var(--accent);
}

.hidden { display: none; }

label {
  display: block;
  margin: 0.5rem 0;
  font-size: 0.9rem;
  color: var(--muted);
}

input[type=text], input[type=email] {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 1rem;
  margin-top: 0.25rem;
}

button {
  background: var(--accent);
  color: white;
  border: 0;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.95rem;
  margin: 0.25rem 0.25rem 0.25rem 0;
}

button:hover { background: var(--accent-hover); }

button.secondary {
  background: white;
  color: var(--accent);
  border: 1px solid var(--accent);
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 0.5rem 0;
}

th, td {
  text-align: left;
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.status-ok { color: var(--green); font-weight: 600; }
.status-down { color: var(--red); font-weight: 600; }
.status-pending { color: var(--amber); font-weight: 600; }

pre.small {
  background: #f3f4f6;
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  font-size: 0.8rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

#qr-container {
  display: flex;
  justify-content: center;
  margin: 1rem 0;
}

#qr-container canvas, #qr-container img {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.5rem;
  background: white;
}

.hint {
  color: var(--muted);
  font-size: 0.85rem;
}

.actions {
  list-style: none;
  padding: 0;
}

.actions li {
  margin: 0.4rem 0;
}

.result-box {
  padding: 1rem;
  border-radius: 4px;
  margin: 0.5rem 0;
}

.result-box.success {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
}

.result-box.error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #7f1d1d;
}

.result-box.pending {
  background: #fffbeb;
  border: 1px solid #fde68a;
  color: #78350f;
}