:root {
  color-scheme: dark;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #07111f;
  color: #f7fbff;
  --accent: #65e6c4;
  --accent-dark: #123a35;
  --panel: #101f31;
  --muted: #b7c7d8;
  --danger: #ff8f8f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  background:
    radial-gradient(circle at 50% 22%, rgba(101, 230, 196, 0.14), transparent 32rem),
    #07111f;
}

button,
input,
summary {
  font: inherit;
}

button,
summary {
  min-height: 3rem;
}

.app-shell {
  width: min(100%, 42rem);
  min-height: 100dvh;
  margin: 0 auto;
  padding: max(1.25rem, env(safe-area-inset-top)) 1.25rem max(1.5rem, env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.app-header {
  text-align: center;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 750;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h1 {
  margin: 0.25rem 0 0;
  font-size: clamp(2rem, 8vw, 3.2rem);
}

.conversation {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.1rem;
  text-align: center;
}

.talk-button {
  width: min(72vw, 19rem);
  aspect-ratio: 1;
  border: 0.35rem solid rgba(255, 255, 255, 0.22);
  border-radius: 50%;
  background: var(--accent);
  color: #04130f;
  box-shadow: 0 1.2rem 4rem rgba(0, 0, 0, 0.36), inset 0 -0.5rem 1rem rgba(0, 0, 0, 0.12);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 120ms ease, background 180ms ease, box-shadow 180ms ease;
}

.talk-button:active {
  transform: scale(0.97);
}

.talk-button:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 0.3rem solid #fff;
  outline-offset: 0.25rem;
}

.talk-button[data-state="listening"] {
  background: #ffd166;
  box-shadow: 0 0 0 0.8rem rgba(255, 209, 102, 0.16), 0 1.2rem 4rem rgba(0, 0, 0, 0.36);
  animation: listening 1.4s ease-in-out infinite;
}

.talk-button[data-state="thinking"] {
  background: #9cb9ff;
}

.talk-button[data-state="speaking"] {
  background: #d8a7ff;
}

.talk-button[data-state="error"] {
  background: var(--danger);
}

@keyframes listening {
  50% { transform: scale(1.035); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

.button-label {
  font-size: clamp(2rem, 9vw, 3.5rem);
  font-weight: 850;
}

.button-hint {
  max-width: 12rem;
  font-size: 0.95rem;
  font-weight: 650;
}

.status {
  margin: 0;
  min-height: 2.5rem;
  font-size: clamp(1.2rem, 5vw, 1.65rem);
  font-weight: 700;
}

.transcript,
.response {
  margin: 0;
  max-width: 36rem;
  min-height: 1.5rem;
  font-size: 1.05rem;
  line-height: 1.5;
}

.transcript {
  color: var(--muted);
  font-style: italic;
}

.response {
  color: #fff;
}

.audio-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
}

.audio-actions button,
.fallback-panel button,
.fallback-panel input {
  border: 0.12rem solid rgba(255, 255, 255, 0.28);
  border-radius: 0.8rem;
  background: var(--panel);
  color: inherit;
  padding: 0.8rem 0.9rem;
}

.fallback-panel {
  border: 0.1rem solid rgba(255, 255, 255, 0.2);
  border-radius: 1rem;
  background: rgba(16, 31, 49, 0.76);
  padding: 0.75rem 1rem 1rem;
}

.fallback-panel summary {
  cursor: pointer;
  display: flex;
  align-items: center;
  font-weight: 750;
}

.fallback-panel form,
.examples {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.fallback-panel label {
  font-weight: 700;
}

.fallback-panel input {
  width: 100%;
  background: #fff;
  color: #07111f;
}

.privacy-note {
  margin: 0;
  color: var(--muted);
  text-align: center;
  font-size: 0.85rem;
}

@media (max-width: 28rem) {
  .audio-actions {
    grid-template-columns: 1fr;
  }
}