:root {
  --tr-bg0: #0f1419;
  --tr-bg1: #1a2332;
  --tr-card: #243044;
  --tr-text: #f2f5f8;
  --tr-muted: #9aa8b8;
  --tr-me: #2f6fed;
  --tr-me-press: #1e4fbe;
  --tr-them: #0d9f6e;
  --tr-them-press: #087a54;
  --tr-warn: #e8a317;
  --tr-radius: 18px;
  --tr-safe-b: env(safe-area-inset-bottom, 0px);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: linear-gradient(165deg, var(--tr-bg0), var(--tr-bg1) 55%, #152028);
  color: var(--tr-text);
  font-family: "SF Pro Text", "PingFang SC", "Segoe UI", sans-serif;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.tr-app {
  max-width: 520px;
  margin: 0 auto;
  min-height: 100dvh;
  padding: 16px 16px calc(20px + var(--tr-safe-b));
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.tr-header h1 {
  margin: 6px 0 4px;
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tr-sub,
.tr-status {
  margin: 0;
  color: var(--tr-muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.tr-back,
.tr-link {
  color: #8eb6ff;
  text-decoration: none;
  font-size: 0.9rem;
}

.tr-gate {
  margin-top: 40px;
  padding: 24px;
  background: var(--tr-card);
  border-radius: var(--tr-radius);
  text-align: center;
}

.tr-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 0;
}

.tr-display-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--tr-muted);
}

.tr-seg {
  display: inline-flex;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  padding: 3px;
  gap: 2px;
}

.tr-seg-btn {
  border: 0;
  background: transparent;
  color: var(--tr-muted);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  cursor: pointer;
}

.tr-seg-btn.is-on {
  background: rgba(255, 255, 255, 0.14);
  color: var(--tr-text);
}

.tr-speak-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.tr-panel {
  flex: 1;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--tr-radius);
  padding: 16px;
  overflow: auto;
  min-height: 180px;
}

.tr-bubble {
  margin-bottom: 14px;
}

.tr-bubble p {
  margin: 6px 0 0;
  font-size: 1.15rem;
  line-height: 1.5;
  user-select: text;
  white-space: pre-wrap;
  word-break: break-word;
}

.tr-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--tr-muted);
}

.tr-dst p {
  color: #d7ecff;
  font-size: 1.28rem;
  font-weight: 600;
}

.tr-status.is-busy {
  color: var(--tr-warn);
}

.tr-status.is-err {
  color: #ff8e8e;
}

.tr-pads {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.tr-ptt {
  appearance: none;
  border: 0;
  border-radius: 22px;
  min-height: 132px;
  padding: 18px 12px;
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  touch-action: none;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
  transition: transform 0.08s ease, filter 0.08s ease, background 0.08s ease;
}

.tr-ptt-me {
  background: linear-gradient(160deg, #3b7cff, var(--tr-me));
}

.tr-ptt-them {
  background: linear-gradient(160deg, #18c489, var(--tr-them));
}

.tr-ptt:active,
.tr-ptt.is-holding {
  transform: scale(0.97);
  filter: brightness(1.08);
}

.tr-ptt-me.is-holding {
  background: var(--tr-me-press);
}

.tr-ptt-them.is-holding {
  background: var(--tr-them-press);
}

.tr-ptt:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.tr-ptt-title {
  font-size: 1.35rem;
  font-weight: 700;
}

.tr-ptt-hint {
  font-size: 0.78rem;
  opacity: 0.9;
}

@media (min-width: 720px) {
  .tr-app {
    padding-top: 28px;
  }
  .tr-ptt {
    min-height: 150px;
  }
}