:root {
  color-scheme: light;
  --color-bg: #eef5f4;
  --color-surface: rgba(255, 255, 255, 0.82);
  --color-border: rgba(255, 255, 255, 0.96);
  --color-text: #102136;
  --color-muted: #68778a;
  --color-mint: #36c8b1;
  --color-mint-dark: #087b6b;
  --color-blue: #2394ed;
  --radius-panel: 24px;
  --radius-control: 16px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  color: var(--color-text);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background:
    linear-gradient(rgba(255, 255, 255, 0.54), rgba(255, 255, 255, 0.54)),
    radial-gradient(circle at 16% 84%, rgba(70, 216, 190, 0.3), transparent 34%),
    radial-gradient(circle at 86% 12%, rgba(108, 158, 244, 0.22), transparent 30%),
    var(--color-bg);
}

button,
textarea,
select {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

.demo-shell {
  width: min(1440px, calc(100% - 48px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 32px 0;
}

.topbar {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.eyebrow,
.step {
  margin: 0 0 4px;
  color: var(--color-mint-dark);
  font-size: 14px;
  font-weight: 600;
  line-height: 22px;
}

h1,
h2,
p {
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: 28px;
  line-height: 36px;
}

h2 {
  margin: 0;
  font-size: 22px;
  line-height: 30px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 40px;
  padding: 0 16px;
  color: var(--color-muted);
  font-size: 14px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--color-border);
  border-radius: 20px;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: #a8b2bd;
  border-radius: 50%;
}

.status[data-state="speaking"] .status-dot {
  background: var(--color-blue);
  animation: status-pulse 1.2s ease-in-out infinite;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(440px, 0.95fr);
  gap: var(--space-3);
  min-height: calc(100vh - 128px);
}

.input-panel,
.avatar-panel {
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-panel);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.input-panel {
  display: flex;
  flex-direction: column;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.counter {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 24px;
}

textarea {
  width: 100%;
  min-height: clamp(184px, 30vh, 260px);
  resize: none;
  padding: 24px;
  color: var(--color-text);
  font-size: 20px;
  line-height: 32px;
  background: rgba(247, 251, 252, 0.88);
  border: 1px solid rgba(160, 181, 188, 0.3);
  border-radius: var(--radius-control);
  outline: none;
  transition: border-color 160ms ease, background-color 160ms ease;
}

textarea:focus {
  background: #ffffff;
  border-color: var(--color-mint);
}

.read-progress {
  min-height: 88px;
  margin-top: var(--space-3);
  padding: 20px 24px;
  background: rgba(223, 244, 240, 0.56);
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: var(--radius-control);
}

.progress-label {
  display: block;
  margin-bottom: var(--space-1);
  color: var(--color-mint-dark);
  font-size: 13px;
  font-weight: 600;
  line-height: 20px;
}

.read-progress p {
  margin: 0;
  color: #43546a;
  font-size: 16px;
  line-height: 24px;
}

.controls {
  display: grid;
  grid-template-columns: minmax(140px, 1fr) 120px 160px;
  gap: 12px;
  align-items: end;
  margin-top: auto;
  padding-top: var(--space-3);
}

.rate-control {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  color: var(--color-muted);
  font-size: 13px;
  line-height: 20px;
}

select,
.button {
  min-height: 52px;
  border-radius: 26px;
}

select {
  padding: 0 18px;
  color: var(--color-text);
  background: #ffffff;
  border: 1px solid rgba(160, 181, 188, 0.34);
  outline: none;
}

.button {
  padding: 0 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 140ms ease, background-color 140ms ease, color 140ms ease;
}

.button:active:not(:disabled) {
  transform: scale(0.98);
}

.button:disabled {
  color: #a4aeb8;
  cursor: not-allowed;
  background: rgba(234, 238, 241, 0.72);
  border-color: transparent;
}

.button-primary {
  color: #ffffff;
  background: var(--color-mint);
  border: 1px solid var(--color-mint);
}

.button-primary:hover:not(:disabled) {
  background: #27bba5;
}

.button-secondary {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.66);
  border: 1px solid rgba(160, 181, 188, 0.34);
}

.button-secondary:hover:not(:disabled) {
  background: #ffffff;
}

.avatar-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.avatar-heading {
  align-items: center;
}

.background-switch {
  display: flex;
  gap: var(--space-1);
  padding: 6px;
  background: rgba(235, 240, 243, 0.76);
  border-radius: 20px;
}

.swatch {
  width: 28px;
  height: 28px;
  padding: 0;
  cursor: pointer;
  background: #e9f4f5;
  border: 2px solid transparent;
  border-radius: 50%;
}

.swatch.is-active {
  border-color: var(--color-mint-dark);
}

.swatch-dark {
  background: #152233;
}

.swatch-green {
  background: #117b55;
}

.avatar-stage {
  position: relative;
  display: grid;
  place-items: center;
  width: min(100%, calc(100vh - 232px), 520px);
  aspect-ratio: 1;
  margin: auto;
  overflow: hidden;
  background: linear-gradient(145deg, #eefcff 0%, #d9f2ef 48%, #e8e6ff 100%);
  border: 1px solid rgba(255, 255, 255, 0.96);
  border-radius: 50%;
  transition: background-color 180ms ease;
}

.avatar-stage[data-background="dark"] {
  background: #152233;
}

.avatar-stage[data-background="green"] {
  background: #117b55;
}

.avatar-composite {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  transform-origin: 50% 72%;
  transform: translate3d(var(--avatar-x, 0), var(--avatar-y, 0), 0)
    rotate(var(--avatar-rotate, 0deg)) scale(var(--avatar-scale, 1));
  transition: transform var(--avatar-motion-duration, 2200ms) cubic-bezier(0.22, 0.61, 0.36, 1);
}

.avatar-panel.is-speaking .avatar-composite {
  --avatar-motion-duration: 1400ms;
}

.avatar-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
  user-select: none;
}

.feature-layer {
  position: absolute;
  z-index: 3;
  pointer-events: none;
  user-select: none;
}

.mouth-layer {
  left: 39.583%;
  top: 47.222%;
  width: 20.833%;
  height: 9.444%;
  opacity: 0;
  transform: scaleY(var(--mouth-scale-y, 0.96));
  transform-origin: 50% 50%;
  transition: opacity 72ms ease-out, transform 120ms ease-out;
}

.mouth-layer.is-visible {
  opacity: var(--mouth-opacity, 0.82);
}

.eye-layer {
  left: 30.556%;
  top: 29.167%;
  width: 38.889%;
  height: 13.889%;
  z-index: 4;
  opacity: 0;
  transition: opacity 56ms ease-out;
}

.eye-layer.is-blinking {
  opacity: 1;
}

.speech-ring {
  position: absolute;
  z-index: 1;
  inset: 14px;
  border: 8px solid rgba(255, 255, 255, 0.84);
  border-radius: 50%;
  opacity: 0.72;
}

.avatar-panel.is-speaking .speech-ring {
  animation: ring-speech 680ms ease-in-out infinite;
}

.viseme-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  margin-top: var(--space-3);
  padding: 0 18px;
  color: var(--color-muted);
  font-size: 14px;
  background: rgba(255, 255, 255, 0.56);
  border: 1px solid rgba(255, 255, 255, 0.94);
  border-radius: 24px;
}

.viseme-status strong {
  color: var(--color-mint-dark);
  font-weight: 600;
}

@keyframes ring-speech {
  0%,
  100% {
    inset: 14px;
    border-width: 8px;
    opacity: 0.6;
  }
  35% {
    inset: 10px;
    border-width: 16px;
    opacity: 0.92;
  }
  68% {
    inset: 12px;
    border-width: 12px;
    opacity: 0.74;
  }
}

@keyframes status-pulse {
  0%,
  100% {
    opacity: 0.42;
  }
  50% {
    opacity: 1;
  }
}

@media (max-width: 960px) {
  .demo-shell {
    width: min(100% - 32px, 760px);
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .avatar-panel {
    min-height: 620px;
  }
}

@media (max-width: 640px) {
  .demo-shell {
    width: min(100% - 24px, 560px);
    padding: 20px 0;
  }

  .topbar {
    align-items: flex-start;
  }

  h1 {
    font-size: 24px;
    line-height: 32px;
  }

  .input-panel,
  .avatar-panel {
    padding: 20px;
  }

  textarea {
    min-height: 220px;
    padding: 18px;
    font-size: 18px;
    line-height: 28px;
  }

  .controls {
    grid-template-columns: 1fr 1fr;
  }

  .rate-control {
    grid-column: 1 / -1;
  }

  .avatar-panel {
    min-height: auto;
  }
}

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