:root {
  --bg: #0a0d12;
  --panel: #141a22;
  --border: #252d38;
  --ink: #eef2f7;
  --muted: #97a4b2;
  --teal: #ff8a3d;
  --blue: #7c9cff;
  --green: #3ddc97;
  --red: #ff6b6b;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: Inter, system-ui, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  min-height: 100vh;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: var(--mono); font-size: 0.9em; color: var(--teal); }
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 13, 18, 0.9);
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  z-index: 10;
}
.brand { display: flex; gap: 0.75rem; align-items: center; }
.brand .sub { font-size: 0.75rem; color: var(--muted); }
.mark {
  width: 2rem; height: 2rem; border-radius: 8px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--teal), #f2701f);
  color: #0a0d12; font-weight: 800;
}
nav { display: flex; gap: 0.5rem; flex-wrap: wrap; }
nav a {
  color: var(--muted);
  padding: 0.4rem 0.7rem;
  border-radius: 8px;
  text-decoration: none;
}
nav a:hover, nav a.active { color: var(--ink); background: var(--panel); }
.wrap { max-width: 960px; margin: 0 auto; padding: 2rem 1.25rem 4rem; }
h1 { font-size: 1.75rem; letter-spacing: -0.02em; margin: 0 0 0.5rem; }
.lead { color: var(--muted); max-width: 60ch; }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.75rem 0;
}
.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem 1.2rem;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s;
}
.card:hover { border-color: var(--teal); text-decoration: none; }
.card h2 { margin: 0 0 0.4rem; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem 1.25rem;
  margin-top: 1.25rem;
}
.box h3 { margin: 0 0 0.6rem; font-size: 0.95rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
label { display: block; font-size: 0.85rem; color: var(--muted); margin: 0.75rem 0 0.3rem; }
input, textarea, select {
  width: 100%;
  background: #0e1116;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--ink);
  padding: 0.6rem 0.75rem;
  font-family: var(--mono);
  font-size: 0.85rem;
}
textarea { min-height: 220px; resize: vertical; }
.row { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: 1rem; }
button, .btn {
  appearance: none;
  border: none;
  border-radius: 8px;
  padding: 0.55rem 1rem;
  font-weight: 700;
  cursor: pointer;
  background: var(--teal);
  color: #0a0d12;
  font-size: 0.9rem;
}
button.ghost, .btn.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--border);
}
button:disabled { opacity: 0.5; cursor: not-allowed; }
.out {
  margin-top: 1rem;
  background: #0e1116;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 480px;
  overflow: auto;
}
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
}
.badge.ok { background: rgba(61, 220, 151, 0.15); color: var(--green); }
.badge.fail { background: rgba(255, 107, 107, 0.15); color: var(--red); }
.check { margin: 0.25rem 0; }
.check.pass { color: var(--green); }
.check.fail { color: var(--red); }
.hint { font-size: 0.8rem; color: var(--muted); margin-top: 0.35rem; }