:root {
  color-scheme: light dark;
  --bg: #0b0f14;
  --surface: #121820;
  --border: #243044;
  --text: #e8edf4;
  --muted: #8b9bb4;
  --accent: #3d8bfd;
  --accent-dim: #2563eb;
  --ok: #3ecf8e;
  --warn: #f5a623;
  --err: #f87171;
  --radius: 10px;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fb;
    --surface: #fff;
    --border: #d8dee9;
    --text: #1a2332;
    --muted: #5c6b82;
    --accent: #0969da;
    --accent-dim: #0550ae;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 56rem; margin: 0 auto; padding: 1.5rem 1.25rem 3rem; }

header.site {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: -0.02em; }
.brand span { color: var(--muted); font-weight: 500; }

nav.top { display: flex; gap: 1rem; flex-wrap: wrap; font-size: 0.95rem; }

.hero h1 { font-size: clamp(1.75rem, 4vw, 2.35rem); margin: 0 0 0.75rem; letter-spacing: -0.03em; }
.hero p.lead { font-size: 1.1rem; color: var(--muted); max-width: 38rem; margin: 0 0 1.5rem; }

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  margin: 2rem 0;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.card h2, .card h3 { margin: 0 0 0.5rem; font-size: 1rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.btn-row { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-top: 1.25rem; }

button, .btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 1rem;
  font-size: 0.95rem;
  cursor: pointer;
  font-family: inherit;
}
button.primary, .btn.primary {
  background: var(--accent);
  border-color: var(--accent-dim);
  color: #fff;
}
button.primary:hover { filter: brightness(1.08); }
button:disabled { opacity: 0.55; cursor: not-allowed; }

.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1.25rem; }
.panel h2 { margin: 0 0 1rem; font-size: 1.1rem; }

label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.35rem; }
input, select {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
  font-family: inherit;
}

.msg { margin-top: 0.75rem; padding: 0.65rem 0.85rem; border-radius: 8px; font-size: 0.9rem; }
.msg.ok { background: color-mix(in srgb, var(--ok) 18%, transparent); color: var(--ok); }
.msg.err { background: color-mix(in srgb, var(--err) 18%, transparent); color: var(--err); }
.msg.warn { background: color-mix(in srgb, var(--warn) 18%, transparent); color: var(--warn); }

.token-box {
  font-family: ui-monospace, "Cascadia Code", monospace;
  font-size: 0.85rem;
  word-break: break-all;
  padding: 0.75rem;
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: 8px;
  margin-top: 0.5rem;
}

.tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.tabs button { flex: 1; min-width: 6rem; }
.tabs button.active { border-color: var(--accent); color: var(--accent); }

.hidden { display: none !important; }

code { font-family: ui-monospace, monospace; font-size: 0.88em; background: var(--bg); padding: 0.1em 0.35em; border-radius: 4px; }

ul.compact { margin: 0.5rem 0 0; padding-left: 1.2rem; color: var(--muted); font-size: 0.92rem; }

footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem; }