:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --line: #dde3ec;
  --text: #1f2937;
  --muted: #6b7280;
  --ok: #16a34a;
  --warn: #d97706;
  --err: #dc2626;
  --accent: #2563eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

header {
  background: #111827;
  color: #fff;
  padding: 14px 20px;
}

header h1 { margin: 0 0 8px; font-size: 18px; font-weight: 600; }

.tag {
  font-size: 12px;
  font-weight: 400;
  background: #374151;
  padding: 2px 8px;
  border-radius: 10px;
  vertical-align: middle;
}

.banner { padding: 6px 10px; border-radius: 4px; background: #374151; font-size: 13px; }
.banner.ok { background: #14532d; }
.banner.warn { background: #78350f; }
.banner.err { background: #7f1d1d; }

nav {
  display: flex;
  gap: 4px;
  padding: 8px 20px 0;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

nav button {
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  padding: 8px 14px;
  cursor: pointer;
  border-radius: 6px 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

nav button.active {
  background: var(--bg);
  border-color: var(--line);
  color: var(--accent);
  font-weight: 600;
}

.tab { display: none; padding: 16px 20px; }
.tab.active { display: block; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 1100px) { .grid2 { grid-template-columns: 1fr; } }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.card h2 { font-size: 15px; margin: 0 0 12px; }
.card h3 { font-size: 13px; margin: 14px 0 6px; color: var(--muted); }

label { display: block; margin-bottom: 10px; font-size: 13px; color: var(--muted); }

select, input[type="text"], input[type="number"], textarea {
  width: 100%;
  margin-top: 4px;
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-family: inherit;
  font-size: 13px;
  color: var(--text);
  background: #fff;
}

textarea { font-family: Consolas, "Courier New", monospace; font-size: 12px; resize: vertical; }

button {
  border: 1px solid var(--line);
  background: #fff;
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
}

button:hover { border-color: var(--accent); color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { opacity: .9; color: #fff; }
button:disabled { opacity: .5; cursor: not-allowed; }

.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin: 10px 0; }

.muted { color: var(--muted); font-size: 12px; }
.warn { color: var(--warn); font-size: 12px; }

.state { font-size: 12px; padding: 4px 0; }
.state.ok { color: var(--ok); }
.state.warn { color: var(--warn); }
.state.err { color: var(--err); }

.output {
  background: #0f172a;
  color: #d1e3ff;
  padding: 10px;
  border-radius: 6px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 12px;
  max-height: 420px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.output.small { max-height: 260px; }

.layers { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; }

.chip {
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  color: #3730a3;
  border-radius: 12px;
  padding: 3px 10px;
  font-size: 12px;
}

.graph { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin: 12px 0; }

.node {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
  background: #f8fafc;
  font-size: 12px;
  text-align: center;
  min-width: 110px;
}

.node.ok { border-color: #bbf7d0; background: #f0fdf4; }
.node.no { border-color: #fecaca; background: #fef2f2; color: var(--err); }

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

code { background: #eef2f7; padding: 1px 4px; border-radius: 3px; }