.kacb {
  position: fixed;
  left: 20px;
  bottom: 20px;
  z-index: 9998;
  --k-primary: var(--primaryColor, #4a7afe);
  --k-bg: var(--bg2, #ffffff);
  --k-bg-soft: var(--bg_lighter2, #f3f6fb);
  --k-border: color-mix(in srgb, var(--k-text) 14%, transparent);
  --k-text: var(--text, #22314f);
}

.kacb-fab {
  width: 60px;
  height: 60px;
  border: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, color-mix(in srgb, #fff 28%, var(--k-primary)), var(--k-primary));
  color: #fff;
  box-shadow: 0 12px 24px color-mix(in srgb, var(--k-primary) 45%, transparent);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform .2s ease;
}

.kacb-fab:hover {
  transform: translateY(-2px);
}

.kacb-fab svg {
  width: 40px;
  height: 40px;
}

.kacb-core {
  animation: kacbPulse 2.1s ease-in-out infinite;
  transform-origin: center;
}

.kacb-ring {
  animation: kacbSpin 6s linear infinite;
  transform-origin: center;
}

@keyframes kacbPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

@keyframes kacbSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.kacb-panel {
  position: absolute;
  left: 0;
  bottom: 74px;
  width: min(390px, calc(100vw - 24px));
  height: 560px;
  background: var(--k-bg);
  border: 0;
  border-radius: 16px;
  overflow: hidden;
  display: none;
  box-shadow: 0 16px 40px rgba(0, 18, 51, 0.25);
  transform: translateY(16px);
  opacity: 0;
}

.kacb-panel.is-open {
  display: flex;
  flex-direction: column;
  animation: kacbFadeInUp .22s ease forwards;
}

.kacb-panel.is-closing {
  animation: kacbFadeOutDown .22s ease forwards;
}

.kacb-header {
  background: linear-gradient(135deg, color-mix(in srgb, var(--k-bg-soft) 84%, var(--k-bg)), color-mix(in srgb, var(--k-bg-soft) 65%, var(--k-bg)));
  color: var(--k-text);
  padding: 12px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.kacb-head-actions { display: flex; gap: 8px; }

.kacb-close,
.kacb-clear {
  border: 0;
  background: color-mix(in srgb, var(--k-text) 10%, transparent);
  color: var(--k-text);
  border-radius: 8px;
  width: 30px;
  height: 30px;
  cursor: pointer;
}

.kacb-meta {
  font-size: 12px;
  color: color-mix(in srgb, var(--k-text) 75%, #667792);
  padding: 7px 12px;
  border-bottom: 1px solid color-mix(in srgb, var(--k-border) 75%, transparent);
}

.kacb-messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  background: color-mix(in srgb, var(--k-bg-soft) 72%, var(--k-bg));
}

.kacb-msg { margin-bottom: 10px; display: flex; }
.kacb-msg.is-user { justify-content: flex-end; }
.kacb-msg.is-ai { justify-content: flex-start; }

.kacb-bubble {
  max-width: 88%;
  border-radius: 12px;
  padding: 10px 11px;
  line-height: 1.7;
  font-size: 13px;
}

.kacb-bubble p { margin: 0 0 8px 0; }
.kacb-bubble p:last-child { margin-bottom: 0; }
.kacb-bubble ul { margin: 6px 0; padding-right: 18px; }

.kacb-msg.is-user .kacb-bubble {
  background: var(--k-primary);
  color: #fff;
}

.kacb-msg.is-ai .kacb-bubble {
  background: var(--k-bg);
  color: var(--k-text);
  border: 0;
}

.kacb-time {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  opacity: .75;
}

.kacb-form {
  border-top: 1px solid color-mix(in srgb, var(--k-border) 70%, transparent);
  padding: 10px;
  display: flex;
  gap: 8px;
  background: var(--k-bg);
}

.kacb-form.is-loading {
  opacity: .7;
}

#kacb-input {
  flex: 1;
  resize: none;
  border: 0;
  outline: none;
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 13px;
  background: var(--k-bg-soft);
  color: var(--k-text);
  transition: box-shadow .2s ease, background-color .2s ease;
}

#kacb-input:focus {
  outline: none;
  background: color-mix(in srgb, var(--k-bg) 78%, var(--k-bg-soft));
  box-shadow:
    0 0 0 2px color-mix(in srgb, var(--k-primary) 22%, transparent),
    0 8px 20px color-mix(in srgb, var(--k-primary) 12%, transparent);
}

#kacb-send {
  border: 0;
  border-radius: 10px;
  background: var(--k-primary);
  color: #fff;
  padding: 0 16px;
  cursor: pointer;
}

.kacb-dots {
  display: inline-flex;
  gap: 4px;
}

.kacb-dots i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--k-primary) 80%, #fff);
  animation: kacbDots 1s ease-in-out infinite;
}

.kacb-dots i:nth-child(2) { animation-delay: .15s; }
.kacb-dots i:nth-child(3) { animation-delay: .3s; }

@keyframes kacbDots {
  0%, 80%, 100% { transform: translateY(0); opacity: .45; }
  40% { transform: translateY(-4px); opacity: 1; }
}

.kacb-skeleton-wrap {
  padding: 6px 0;
}

.kacb-skeleton {
  height: 14px;
  border-radius: 999px;
  margin-bottom: 10px;
  background: linear-gradient(
    90deg,
    color-mix(in srgb, var(--k-bg) 75%, #e7edf8) 25%,
    color-mix(in srgb, var(--k-bg) 40%, #f7faff) 50%,
    color-mix(in srgb, var(--k-bg) 75%, #e7edf8) 75%
  );
  background-size: 220% 100%;
  animation: kacbSkeleton 1.15s ease-in-out infinite;
}

.kacb-skeleton.sk-1 { width: 78%; }
.kacb-skeleton.sk-2 { width: 92%; }
.kacb-skeleton.sk-3 { width: 66%; }

@keyframes kacbSkeleton {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

@keyframes kacbFadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes kacbFadeOutDown {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(16px); }
}

.kacb-vip-lock {
  background: var(--k-bg);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.08);
}

.kacb-vip-text {
  margin: 0 0 10px;
  color: var(--k-text);
}

.kacb-vip-btn {
  display: inline-block;
  text-decoration: none;
  padding: 9px 14px;
  border-radius: 10px;
  color: #fff;
  background: var(--k-primary);
}

@media (max-width: 600px) {
  .kacb { left: 12px; bottom: 12px; }
  .kacb-panel { width: calc(100vw - 24px); height: 72vh; }
}