:root {
  --bg: #0b0e14;
  --panel: #131822;
  --panel2: #1b2230;
  --line: #232b3a;
  --text: #d7dee9;
  --muted: #8a97aa;
  --accent: #5db0ff;
  --ok: #3fb950;
  --warn: #d29922;
  --err: #f85149;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.brand { font-weight: 700; letter-spacing: 0.3px; }
.brand span { color: var(--accent); font-weight: 600; }
.status { color: var(--muted); font-size: 13px; }
.status.ok { color: var(--ok); }

.app { max-width: 1000px; margin: 0 auto; padding: 24px 22px 60px; }
.lede { color: var(--muted); max-width: 760px; }
.lede strong { color: var(--text); }

.node-control {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin: 18px 0; padding: 12px; background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
}
.node-control label { color: var(--text); font-weight: 600; font-size: 13px; }
.node-control select {
  min-width: 260px; background: #0d1117; color: var(--text); border: 1px solid var(--line);
  border-radius: 7px; padding: 7px 9px;
}
.node-control span { color: var(--muted); font-size: 12px; }

.tabs { display: flex; gap: 8px; margin: 18px 0 20px; }
.tab {
  background: var(--panel); color: var(--muted); border: 1px solid var(--line);
  padding: 7px 14px; border-radius: 8px; cursor: pointer; text-transform: capitalize;
}
.tab.active { color: var(--text); border-color: var(--accent); background: var(--panel2); }

.samples { display: grid; gap: 16px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; }
.card h3 { margin: 0 0 4px; font-size: 15px; }
.desc { margin: 0 0 12px; color: var(--muted); }

.modebar { display: flex; gap: 6px; margin-bottom: 0; }
.modebtn {
  background: transparent; color: var(--muted); border: 1px solid var(--line);
  border-bottom: none; padding: 5px 12px; border-radius: 6px 6px 0 0; cursor: pointer; font-size: 12px;
}
.modebtn.active { color: var(--text); background: var(--panel2); border-color: var(--line); }

.code {
  margin: 0 0 14px; padding: 14px; background: #0d1117; border: 1px solid var(--line);
  border-radius: 0 8px 8px 8px; overflow-x: auto; font: 12.5px/1.55 ui-monospace, SFMono-Regular, Menlo, monospace;
  color: #c9d4e3; white-space: pre;
}
.payload-label { display: block; font-size: 12px; color: var(--muted); margin: 0 0 5px; }
.payload {
  width: 100%; box-sizing: border-box; margin: 0 0 6px; padding: 9px 11px;
  background: #0d1117; border: 1px solid var(--line); border-radius: 8px; resize: vertical;
  color: #c9d4e3; font: 12.5px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
}
.payload:focus { outline: none; border-color: var(--accent); }
.payload-err { margin: 0 0 12px; color: var(--err); font-size: 12px; }

.panel { border-top: 1px dashed var(--line); padding-top: 12px; }
.controls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }

.btn {
  background: var(--accent); color: #08111c; border: none; padding: 7px 13px;
  border-radius: 7px; cursor: pointer; font-weight: 600; font-size: 13px; text-decoration: none;
}
.btn.run { background: var(--panel2); color: var(--text); border: 1px solid var(--line); font-weight: 500; }
.btn.run:hover { border-color: var(--accent); }

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

.result {
  margin: 0; padding: 12px 14px; background: #0d1117; border: 1px solid var(--line);
  border-radius: 8px; min-height: 20px; overflow-x: auto;
  font: 12.5px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; color: #9fb0c4; white-space: pre-wrap;
}
.result.err { color: var(--err); }

.denied { max-width: 520px; margin: 80px auto; text-align: center; }
.denied h1 { font-size: 20px; }
.denied p { color: var(--muted); }
.denied .btn { display: inline-block; margin-top: 14px; }