/* Sandbox-only chrome: banner, About dialog, and hiding the ops tools that
   have no meaning without the real backend. */
#btn-screens, #btn-fillout, #btn-ops, #btn-sweep, #fillout-notice,
.coll-pop [data-act="screens"] { display: none !important; }

.demo-banner {
  display: flex; align-items: center; justify-content: center; gap: 12px; flex-wrap: wrap;
  padding: 7px 16px; background: var(--text); color: #fff;
  font: 500 12px/1.4 var(--font); letter-spacing: .01em; text-align: center;
}
.demo-banner strong { color: var(--accent-bright); text-transform: uppercase; letter-spacing: .08em; }
.demo-banner button {
  font: inherit; color: #fff; background: transparent; cursor: pointer;
  border: 1px solid rgba(255,255,255,.45); border-radius: var(--radius); padding: 2px 10px;
}
.demo-banner button:hover { border-color: #fff; }

.about-dialog {
  margin: auto; width: min(640px, calc(100vw - 32px)); max-height: min(86vh, 820px); padding: 0;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
  color: var(--text); font-family: var(--font); box-shadow: var(--shadow-float);
}
.about-dialog[open] { display: flex; flex-direction: column; }
.about-dialog::backdrop { background: rgba(8,32,60,.55); backdrop-filter: blur(6px); }
.about-head {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 16px;
  padding: 20px 22px 14px; border-bottom: 1px solid var(--line-soft);
}
.about-head h2 { margin: 4px 0 0; font: 700 20px/1.2 var(--font-display); text-transform: uppercase; letter-spacing: .02em; }
.about-body { padding: 6px 22px 8px; overflow-y: auto; font-size: 13px; line-height: 1.6; color: var(--ink-dim); }
.about-body p { margin: 12px 0; }
.about-body h3 { margin: 18px 0 6px; font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--text); }
.about-body ul { margin: 0; padding-left: 18px; }
.about-body li { margin: 4px 0; }
.about-body strong { color: var(--text); }
.about-body a { color: var(--accent); }
.about-body code { background: var(--surface-2); padding: 1px 5px; border: 1px solid var(--line-soft); font-size: 12px; }
.about-by { margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--line-soft); font-size: 12px; }
.about-foot {
  display: flex; justify-content: space-between; gap: 12px; padding: 14px 22px;
  border-top: 1px solid var(--line-soft); background: var(--surface-2);
}
.about-dialog .btn {
  min-height: 36px; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg); color: var(--text); font: 500 0.8rem/1.4 var(--font); cursor: pointer;
}
.about-dialog .btn:hover { border-color: var(--accent); color: var(--accent); }
.about-dialog .btn-primary {
  min-height: 36px; padding: 8px 18px; border: none; border-radius: var(--radius);
  background: var(--accent); color: #fff; font: 600 0.85rem/1.4 var(--font); cursor: pointer;
}
.about-dialog .btn-primary:hover { filter: brightness(1.1); }

@media (max-width: 700px) {
  .demo-banner { font-size: 11px; padding: 6px 12px; }
  .about-head, .about-body, .about-foot { padding-left: 16px; padding-right: 16px; }
}