:root {
  --bg: #0a0a0a;
  --bg-card: #111111;
  --border: #1e1e1e;
  --text: #fafafa;
  --dim: #888888;
  --accent: #f59e0b;
  --green: #22c55e;
  --red: #ef4444;
  --mono: 'JetBrains Mono', 'SF Mono', Consolas, Monaco, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { background: var(--bg); color: var(--text); font-family: -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; }

body { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  display: flex; align-items: baseline; gap: 16px;
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
}
.brand { font-size: 1.25rem; font-weight: 700; }
.tag { color: var(--dim); font-size: 0.85rem; }

.layout {
  flex: 1;
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
  max-width: 1100px; width: 100%; margin: 0 auto;
  padding: 24px;
}
@media (max-width: 800px) { .layout { grid-template-columns: 1fr; } }

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
.panel-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 16px; }

.dropzone {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 32px;
  text-align: center;
  color: var(--dim);
  margin-bottom: 16px;
}
.dropzone.drag { border-color: var(--accent); color: var(--text); }

button { cursor: pointer; font-family: inherit; }
#pick-btn, .btn-act {
  background: var(--accent); color: #000; border: none;
  padding: 10px 16px; border-radius: 6px; font-weight: 600;
  margin-top: 8px;
}
.btn-act:disabled { opacity: 0.4; cursor: not-allowed; }

.meta { margin: 12px 0; font-size: 0.9rem; line-height: 1.5; }
.meta code { font-family: var(--mono); color: var(--green); word-break: break-all; }
.hidden { display: none !important; }
.dim { color: var(--dim); }

.chip-wrap { margin-top: 16px; display: flex; align-items: center; gap: 10px; }
.code-chip {
  font-family: var(--mono); font-size: 0.95rem;
  background: #1a1a1a; color: var(--accent);
  border: 1px solid var(--accent); border-radius: 6px;
  padding: 8px 12px;
}
.flash { color: var(--green); font-size: 0.85rem; }

.recv-row { display: flex; }
#code-input {
  width: 100%;
  background: #0d0d0d; color: var(--text);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 12px; font-family: var(--mono); font-size: 0.9rem;
}

.status {
  max-width: 1100px; width: 100%; margin: 0 auto; padding: 0 24px 24px;
}
.status-line { display: flex; gap: 8px; margin: 6px 0; font-size: 0.95rem; }
#state.act { color: var(--accent); }
#sas { font-family: var(--mono); color: var(--accent); }
#progress { font-family: var(--mono); color: var(--accent); }
#result.ok { color: var(--green); }
#result.fail { color: var(--red); }

.progressbar {
  height: 10px; background: #1a1a1a;
  border-radius: 5px; overflow: hidden; margin: 8px 0;
}
.progressbar-fill { height: 100%; width: 0%; background: var(--accent); transition: width 0.15s; }

.foot {
  border-top: 1px solid var(--border);
  padding: 16px 24px; text-align: center;
  color: var(--dim); font-size: 0.85rem;
}