:root {
  --bg: #0f1117;
  --card: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --primary: #2563eb;
  --accent: #60a5fa;
  --danger: #da3633;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.screen { display: none; min-height: 100vh; }
.screen.active { display: flex; flex-direction: column; }
.pin-card {
  margin: auto;
  max-width: 360px;
  width: 92%;
  padding: 2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  text-align: center;
}
#pin-input {
  width: 100%;
  font-size: 1.5rem;
  letter-spacing: 0.4em;
  text-align: center;
  padding: 0.75rem;
  margin: 1rem 0;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #21262d;
  color: var(--text);
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.5rem;
  background: #161b22;
}
.tabs button {
  flex: 1;
  min-width: 5rem;
  padding: 0.5rem;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.tabs button.active { background: var(--primary); color: #fff; }
.content { flex: 1; padding: 1rem; overflow: auto; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
}
.btn {
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1rem;
  cursor: pointer;
  font-weight: 600;
}
.btn.primary { background: var(--primary); color: #fff; }
.btn.small { background: #2d333b; color: var(--text); font-size: 0.85rem; }
.error { color: var(--danger); min-height: 1.2em; }
.muted { color: var(--muted); font-size: 0.85rem; margin-left: 0.5rem; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
th, td {
  padding: 0.5rem 0.4rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
th { color: var(--accent); font-size: 0.8rem; }
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}
.grid-cards a, .grid-cards button {
  display: block;
  padding: 1rem;
  background: #21262d;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
  text-align: center;
}