:root {
  --bg: #0d0f12;
  --fg: #e6e6e6;
  --muted: #888;
  --accent: #4caf50;
  --accent-2: #1e88e5;
  --warn: #ffb300;
  --err: #e53935;
  --panel: #1a1d22;
  --border: #2a2e35;
  --font: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.4;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

header h1 {
  font-size: 18px;
  margin: 0 0 4px;
  letter-spacing: 0.5px;
}
header .sub {
  margin: 0 0 24px;
  color: var(--muted);
}

h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin: 0 0 8px;
}

section {
  margin-bottom: 24px;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

fieldset {
  border: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
fieldset legend { display: none; }
fieldset label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

input[type="text"] {
  background: #0d0f12;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 10px;
  font-family: var(--font);
  font-size: 14px;
  width: 100%;
  margin-bottom: 8px;
}
input[type="text"]:focus { outline: 1px solid var(--accent-2); }

button {
  background: var(--accent);
  color: #0d0f12;
  border: none;
  border-radius: 4px;
  padding: 8px 14px;
  font-family: var(--font);
  font-weight: 600;
  cursor: pointer;
}
button:disabled { opacity: 0.5; cursor: default; }
button.listening { background: var(--err); color: white; }

.muted { color: var(--muted); }
.sub { color: var(--muted); font-size: 13px; }

#mic-status { margin-left: 12px; }

canvas { display: block; width: 100%; height: 160px; background: #0d0f12; border-radius: 4px; }
.freq-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
  color: var(--muted);
  font-size: 11px;
}

#log {
  background: #0d0f12;
  border-radius: 4px;
  padding: 8px;
  max-height: 280px;
  overflow-y: auto;
  font-size: 13px;
}
.log-line { padding: 2px 0; white-space: pre-wrap; word-break: break-word; }
.log-sent { color: var(--accent-2); }
.log-recv { color: var(--accent); }
.log-recv.bad { color: var(--warn); }
.log-dropped { color: var(--err); }
.log-info { color: var(--muted); }

footer { color: var(--muted); font-size: 12px; }