:root {
  --usc-accent: #eb8e05;
  --usc-accent-dark: #c97704;
  --usc-text: #262626;
  --usc-muted: #718096;
  --usc-border: #e2e8f0;
  --usc-surface: #ffffff;
  --usc-soft: #fffbeb;
  --usc-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
}

.usc-root {
  position: fixed;
  bottom: 0;
  left: auto;
  right: 0;
  width: 0;
  height: 0;
  z-index: 1000001;
  font-family: inherit;
  color: var(--usc-text);
}

.usc-toggle {
  position: fixed;
  left: auto;
  right: 20px !important;
  bottom: 20px;
  z-index: 1000001;
  width: 58px;
  height: 58px;
  border: 0;
  border-radius: 50%;
  background: var(--usc-accent);
  color: #ffffff;
  box-shadow: var(--usc-shadow);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 2px;
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.2s;
}

.usc-toggle:hover {
  background: var(--usc-accent-dark);
  transform: scale(1.05);
}

.usc-toggle:active {
  transform: scale(0.95);
}

.usc-toggle i {
  font-size: 1.35rem;
  line-height: 1;
}

.usc-toggle-text {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  line-height: 1;
}

.usc-toggle:focus-visible,
.usc-send:focus-visible,
.usc-input:focus-visible,
.usc-close:focus-visible {
  outline: 3px solid rgba(235, 142, 5, 0.35);
  outline-offset: 2px;
}

.usc-panel {
  position: fixed;
  left: auto;
  right: 20px !important;
  bottom: 184px;
  z-index: 1000001;
  width: 380px;
  max-width: calc(100vw - 44px);
  height: 540px;
  max-height: calc(100vh - 214px);
  background: var(--usc-surface);
  border: 1px solid var(--usc-border);
  border-radius: 12px;
  box-shadow: var(--usc-shadow);
  overflow: hidden;
  
  display: flex;
  flex-direction: column;
  
  /* Smooth opacity & translate-up transitions */
  visibility: hidden;
  opacity: 0;
  transform: translateY(15px);
  pointer-events: none;
  transition: visibility 0s 0.22s, opacity 0.22s ease-out, transform 0.22s ease-out;
}

.usc-root.is-open .usc-panel {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  transition: visibility 0s 0s, opacity 0.22s ease-out, transform 0.22s ease-out;
}

.usc-root.is-open .usc-toggle {
  background: var(--usc-accent-dark);
}

.usc-header {
  background: var(--usc-accent);
  color: #ffffff;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.usc-header,
.usc-header * {
  color: #ffffff !important;
}

.usc-title {
  margin: 0;
  font-size: 1rem;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: 0.3px;
}

.usc-subtitle {
  display: block;
  margin-top: 3px;
  font-size: 0.74rem;
  font-weight: 400;
  opacity: 0.92;
}

.usc-close {
  width: 32px;
  height: 32px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 50%;
  color: #ffffff;
  background: transparent;
  cursor: pointer;
  font-size: 1.3rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s;
}

.usc-close:hover {
  background: rgba(255, 255, 255, 0.15);
}

.usc-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  background: linear-gradient(180deg, #ffffff 0%, #fffbf5 100%);
  display: flex;
  flex-direction: column;
}

.usc-message {
  max-width: 88%;
  margin: 0 0 12px;
  padding: 10px 14px;
  border-radius: 12px;
  line-height: 1.5;
  font-size: 0.92rem;
  word-break: break-word;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  display: flex;
  flex-direction: column;
}

.usc-message.bot {
  background: #ffffff;
  border: 1px solid var(--usc-border);
  color: var(--usc-text);
  align-self: flex-start;
  border-bottom-left-radius: 2px;
}

.usc-message.user {
  align-self: flex-end;
  background: var(--usc-accent);
  color: #ffffff;
  border-bottom-right-radius: 2px;
}

.usc-message-meta {
  font-size: 0.68rem;
  color: var(--usc-muted);
  text-align: right;
  margin-top: 5px;
  user-select: none;
}

.usc-message.user .usc-message-meta {
  color: rgba(255, 255, 255, 0.75);
}

.usc-message blockquote {
  border-left: 3px solid var(--usc-accent);
  background: var(--usc-soft);
  margin: 8px 0;
  padding: 6px 10px;
  border-radius: 0 8px 8px 0;
  font-style: italic;
  font-size: 0.88rem;
  color: #4a5568;
}

.usc-bullet {
  margin-left: 4px;
  margin-top: 3px;
  margin-bottom: 3px;
  line-height: 1.45;
}

.usc-message a {
  color: var(--usc-accent-dark);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px dashed var(--usc-accent);
}

.usc-message a:hover {
  color: var(--usc-accent);
  border-bottom-style: solid;
}

.usc-message.user a {
  color: #ffffff;
  border-bottom-color: #ffffff;
}

/* Suggestion Chips Style */
.usc-chips-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 12px;
  align-self: flex-start;
}

.usc-chip {
  background: #ffffff;
  border: 1px solid var(--usc-accent);
  color: var(--usc-accent);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.usc-chip:hover {
  background: var(--usc-accent);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.08);
}

.usc-thinking {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 2px 0;
}

.usc-thinking-text {
  color: var(--usc-muted);
  font-size: 0.86rem;
  font-weight: 500;
}

.usc-thinking-dots {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}

.usc-thinking-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--usc-accent);
  animation: usc-bounce 1s infinite ease-in-out;
}

.usc-thinking-dots span:nth-child(2) {
  animation-delay: 0.15s;
}

.usc-thinking-dots span:nth-child(3) {
  animation-delay: 0.3s;
}

.usc-sources {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--usc-border);
  width: 100%;
}

.usc-sources strong {
  display: block;
  margin-bottom: 4px;
  color: var(--usc-text);
  font-size: 0.82rem;
}

.usc-sources a {
  display: inline-block;
  margin-right: 12px;
  margin-top: 2px;
  font-size: 0.84rem;
}

.usc-form {
  border-top: 1px solid var(--usc-border);
  padding: 10px;
  display: flex;
  align-items: stretch;
  gap: 8px;
  background: #ffffff;
}

.usc-input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--usc-border);
  border-radius: 8px;
  padding: 10px 14px;
  font: inherit;
  font-size: 0.92rem;
  transition: border-color 0.2s;
}

.usc-input:focus {
  border-color: var(--usc-accent);
  outline: none;
}

.usc-send {
  min-width: 72px;
  border: 0;
  border-radius: 8px;
  padding: 0 16px;
  background: var(--usc-accent);
  color: #ffffff;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

.usc-send:hover {
  background: var(--usc-accent-dark);
}

.usc-send:active {
  transform: scale(0.96);
}

.usc-note {
  padding: 0 12px 10px;
  color: var(--usc-muted);
  font-size: 0.72rem;
  background: #ffffff;
  text-align: center;
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 12px;
}

@keyframes usc-bounce {
  0%,
  80%,
  100% {
    opacity: 0.35;
    transform: translateY(0);
  }
  40% {
    opacity: 1;
    transform: translateY(-4px);
  }
}

@media (max-width: 575.98px) {
  .usc-toggle {
    left: auto;
    right: 18px !important;
    bottom: 18px;
    width: 56px;
    height: 56px;
  }

  .usc-panel {
    left: 10px;
    right: 10px;
    bottom: 184px;
    width: auto;
    max-width: none;
    height: calc(100vh - 212px);
    max-height: 520px;
    border-radius: 12px;
  }

  .usc-header {
    padding: 12px 14px;
  }

  .usc-messages {
    padding: 12px;
  }

  .usc-message {
    max-width: 92%;
    font-size: 0.9rem;
  }
}