:root {
  --bg: #0f1419;
  --card: #1a2332;
  --border: #2a3544;
  --text: #e7ecf3;
  --muted: #8b98a8;
  --primary: #3b82f6;
  --danger: #ef4444;
  --radius: 12px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.auth-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-card, .modal-card, .node-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.auth-card { width: min(420px, 100%); }
.auth-card h1 { margin: 0 0 8px; font-size: 1.5rem; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(26, 35, 50, 0.8);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
}

.container { max-width: 960px; margin: 0 auto; padding: 24px; }

.hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.hero h1 { margin: 0 0 8px; }

.muted { color: var(--muted); }

.form label, .field label {
  display: block;
  margin: 12px 0 6px;
  color: var(--muted);
  font-size: 0.9rem;
}

input[type="text"],
input[type="password"],
input[readonly] {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #111827;
  color: var(--text);
}

.btn {
  border: 1px solid var(--border);
  background: #111827;
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

.btn:hover { border-color: var(--primary); }
.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}
.btn.ghost { background: transparent; }
.btn.danger {
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.4);
}

.node-list { display: grid; gap: 16px; }
.node-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.node-head h2 { margin: 0; font-size: 1.1rem; }
.tag {
  font-size: 0.8rem;
  color: var(--muted);
  background: #111827;
  padding: 4px 8px;
  border-radius: 999px;
}

.copy-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}

.node-actions { margin-top: 16px; text-align: right; }

.alert {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.35);
  padding: 10px 12px;
  border-radius: 8px;
  margin: 12px 0;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 12px 16px;
  border-radius: 8px;
  z-index: 20;
}

.hidden { display: none !important; }

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: grid;
  place-items: center;
  padding: 24px;
  z-index: 10;
}

.modal-card { width: min(420px, 100%); }
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 20px;
}

@media (max-width: 640px) {
  .hero { flex-direction: column; align-items: flex-start; }
  .copy-row { grid-template-columns: 1fr; }
}