:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --border: #e4e7eb;
  --ink: #1b1f23;
  --muted: #6a737d;
  --accent: #0b6bcb;
  --accent-soft: #e6f0fb;
  --ok: #1f883d;
  --ok-soft: #e7f6ec;
  --warn: #b35c00;
  --warn-soft: #fff4e5;
  --err: #b42318;
  --err-soft: #fde8e6;
  --shadow: 0 1px 2px rgba(17, 24, 39, 0.04), 0 1px 3px rgba(17, 24, 39, 0.06);
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  padding: 1.5rem;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.45;
}

.container { max-width: 1100px; margin: 0 auto; }

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}
header h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.bar { display: flex; gap: 0.75rem; align-items: center; }

button {
  padding: 0.5rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  box-shadow: var(--shadow);
  transition: background 0.15s ease;
}
button:hover { background: #0958a8; }
button:active { background: #074a8f; }

.status {
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  background: #eef1f4;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.status.listening { background: var(--ok-soft); color: var(--ok); }
.status.error { background: var(--err-soft); color: var(--err); }
.status.connecting { background: var(--accent-soft); color: var(--accent); }
.status.closed, .status.disconnected { background: #eef1f4; color: var(--muted); }

main {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  box-shadow: var(--shadow);
}

#prompt { grid-column: 1 / -1; }
#prompt label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}
#prompt textarea {
  width: 100%;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1rem;
  padding: 0.75rem 0.9rem;
  background: #fafbfc;
  border: 1px solid var(--border);
  border-radius: 6px;
  resize: vertical;
  line-height: 1.6;
  color: var(--ink);
}
#prompt textarea:focus { outline: none; border-color: var(--accent); background: var(--card); }
#prompt textarea:disabled { background: #f3f4f6; color: var(--muted); cursor: not-allowed; }
.keyterms-line { margin: 0.6rem 0 0; font-size: 0.8rem; color: var(--muted); line-height: 1.5; }
.keyterms-label { font-weight: 500; margin-right: 0.35rem; }
.keyterm-pill { display: inline-block; background: var(--accent-soft); color: var(--accent); padding: 0.1rem 0.45rem; border-radius: 10px; margin: 0 0.2rem 0.2rem 0; font-size: 0.78rem; font-weight: 500; }
.keyterm-none { font-style: italic; color: #a0a5ab; }

#transcript { min-height: 280px; }
#finals { margin: 0; color: var(--ink); font-size: 1.05rem; line-height: 1.6; }
#interim { margin: 0.5rem 0 0; color: var(--muted); font-style: italic; min-height: 1.3em; font-size: 1.05rem; line-height: 1.6; }

#metrics { height: fit-content; font-size: 0.85rem; padding: 0.75rem 0.9rem; }
#metrics div {
  display: flex;
  justify-content: space-between;
  padding: 0.35rem 0;
  border-bottom: 1px solid #f0f2f5;
}
#metrics div:last-child { border-bottom: none; }
#metrics span:first-child { color: var(--muted); }
#metrics span:last-child { font-variant-numeric: tabular-nums; font-weight: 500; }

#comparison { grid-column: 1 / -1; }
#comparison h2 {
  margin: 0 0 0.75rem;
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}
.wer-row {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.85rem;
  padding: 0.5rem 0.75rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 6px;
  display: inline-block;
}
.diff-row { margin-bottom: 0.5rem; line-height: 2; font-size: 0.98rem; }
.diff-row strong { color: var(--muted); font-weight: 600; margin-right: 0.5rem; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.03em; }
.diff-legend {
  margin-top: 0.9rem;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--border);
  font-size: 0.75rem;
  color: var(--muted);
}
.diff-legend span { margin-right: 0.15rem; }

.d-match { color: var(--ink); }
.d-del { color: var(--err); background: var(--err-soft); text-decoration: line-through; padding: 0.05rem 0.25rem; border-radius: 3px; }
.d-ins { color: var(--ok); background: var(--ok-soft); padding: 0.05rem 0.25rem; border-radius: 3px; }
.d-sub { color: var(--warn); background: var(--warn-soft); text-decoration: line-through; padding: 0.05rem 0.25rem; border-radius: 3px; }
.d-sub-hyp { color: var(--warn); background: var(--warn-soft); padding: 0.05rem 0.25rem; border-radius: 3px; }
.d-gap { color: #c8ccd1; letter-spacing: 0.15em; }

.error {
  grid-column: 1 / -1;
  background: var(--err-soft);
  color: var(--err);
  padding: 0.75rem 1rem;
  border: 1px solid #f5c2be;
  border-radius: 6px;
  font-size: 0.9rem;
}
.hidden { display: none; }

@media (max-width: 760px) {
  main { grid-template-columns: 1fr; }
  #metrics { order: 3; }
}