/* NoBlox brand system — monochrome, derived from the NB logo (ink #231f20 / white). */
:root {
  --ink: #231f20;
  --paper: #faf7f1;

  /* light mode (default) */
  --bg: #faf7f1;
  --bg-soft: #efe9de;
  --card: #ffffff;
  --text: #231f20;
  --muted: #726a63;
  --line: rgba(35, 31, 32, 0.15);
  --accent: #231f20;
  --accent-hover: #000000;
  --on-accent: #ffffff;
  --logo-light: block; /* ink logo, for light bg */
  --logo-dark: none;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1614;
    --bg-soft: #252019;
    --card: #252019;
    --text: #f5f0ea;
    --muted: #a89f95;
    --line: rgba(245, 240, 234, 0.15);
    --accent: #f5f0ea;
    --accent-hover: #ffffff;
    --on-accent: #231f20;
    --logo-light: none;
    --logo-dark: block; /* white logo, for dark bg */
  }
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--text); }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: var(--bg-soft);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 0.92em;
}

.logo-light { display: var(--logo-light); }
.logo-dark { display: var(--logo-dark); }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 720px; }

.nav { display: flex; justify-content: space-between; align-items: center; padding: 18px 0; }
.nav .brand { height: 40px; width: auto; }

.btn {
  display: inline-flex; align-items: center; gap: 10px; border: 0; cursor: pointer;
  font: inherit; font-weight: 700; text-decoration: none; border-radius: 10px;
  padding: 13px 22px; background: var(--accent); color: var(--on-accent);
}
.btn:hover { background: var(--accent-hover); }
.btn-li { background: #0a66c2; color: #fff; }
.btn-li:hover { background: #0959ab; }
.btn-ghost { background: transparent; color: var(--muted); padding: 8px 10px; }
.btn-ghost:hover { color: var(--text); }
.btn-sm { padding: 9px 14px; border-radius: 8px; }

.muted { color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 24px; }

label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 5px; }
input, textarea {
  width: 100%; padding: 11px 13px; border-radius: 9px; border: 1px solid var(--line);
  background: var(--bg); color: var(--text); font: inherit;
}
input:focus, textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }
textarea { min-height: 96px; resize: vertical; }

.banner { padding: 12px 16px; border-radius: 10px; margin-bottom: 18px; font-weight: 600; border: 1px solid var(--line); }
.banner-ok { background: var(--bg-soft); color: var(--text); }
.banner-err { background: #fdecec; color: #a11; border-color: transparent; }
@media (prefers-color-scheme: dark) { .banner-err { background: #3a1414; color: #ff9a9a; } }