/* 全站 AI 接入助手 —— 自适应 landing（深蓝）与 console（暗绿）两套主题 */
.pca-fab {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  height: 48px;
  padding: 0 18px 0 14px;
  border: 1px solid var(--line-2, var(--line-strong));
  border-radius: 999px;
  background: color-mix(in srgb, var(--ink) 86%, transparent);
  color: var(--text);
  font-family: var(--display, var(--head));
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  cursor: pointer;
  backdrop-filter: blur(14px);
  box-shadow: 0 16px 40px -20px rgba(0, 0, 0, .85), inset 0 0 0 1px rgba(255, 255, 255, .03);
  transition: transform .3s var(--ease, cubic-bezier(.16, 1, .3, 1)),
              border-color .3s var(--ease, cubic-bezier(.16, 1, .3, 1)),
              box-shadow .3s var(--ease, cubic-bezier(.16, 1, .3, 1));
}
.pca-fab:hover {
  transform: translate3d(0, -2px, 0);
  border-color: var(--lime, var(--sign));
  box-shadow: 0 20px 44px -18px rgba(0, 0, 0, .9), 0 0 0 4px rgba(201, 242, 77, .08);
}
.pca-fab:active { transform: translate3d(0, 0, 0) scale(.98); }
.pca-fab-mark {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--lime, var(--sign)), var(--cyan));
  color: #06110c;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0;
}
.pca-fab[aria-expanded="true"] {
  border-color: var(--lime, var(--sign));
  background: color-mix(in srgb, var(--lime, var(--sign)) 18%, var(--ink));
}
.pca-fab[aria-expanded="true"] .pca-fab-mark { background: linear-gradient(135deg, var(--cyan), var(--lime, var(--sign))); }

/* ── 面板 ───────────────────────────────────────────── */
.pca-panel {
  position: fixed;
  right: 22px;
  bottom: 82px;
  z-index: 81;
  display: flex;
  flex-direction: column;
  width: 396px;
  height: min(600px, calc(100dvh - 132px));
  border: 1px solid var(--line-2, var(--line-strong));
  border-radius: 12px;
  background: color-mix(in srgb, var(--ink) 94%, transparent);
  backdrop-filter: blur(20px);
  box-shadow: 0 40px 80px -32px rgba(0, 0, 0, .9), 0 0 0 1px rgba(255, 255, 255, .02);
  overflow: hidden;
  opacity: 0;
  transform: translate3d(0, 14px, 0) scale(.98);
  transform-origin: 100% 100%;
  pointer-events: none;
  transition: opacity .26s var(--ease, cubic-bezier(.16, 1, .3, 1)),
              transform .34s var(--ease, cubic-bezier(.16, 1, .3, 1));
}
.pca-panel.open { opacity: 1; transform: translate3d(0, 0, 0) scale(1); pointer-events: auto; }

.pca-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(201, 242, 77, .06), transparent);
}
.pca-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--lime, var(--sign));
  box-shadow: 0 0 10px var(--lime, var(--sign));
  animation: pcaPulse 2.4s ease-in-out infinite;
}
@keyframes pcaPulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
.pca-title { display: flex; flex-direction: column; line-height: 1.35; min-width: 0; }
.pca-title b { font-size: 13px; font-weight: 700; letter-spacing: .04em; }
.pca-title span { font-family: var(--mono); font-size: 9.5px; letter-spacing: .12em; color: var(--dim); }
.pca-close {
  margin-left: auto;
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
  transition: color .2s, border-color .2s;
}
.pca-close:hover { color: var(--lime, var(--sign)); border-color: var(--lime, var(--sign)); }

.pca-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scrollbar-width: thin;
  scrollbar-color: rgba(201, 242, 77, .3) transparent;
}
.pca-body::-webkit-scrollbar { width: 6px; }
.pca-body::-webkit-scrollbar-thumb { background: rgba(201, 242, 77, .28); border-radius: 6px; }

.pca-msg { max-width: 92%; font-size: 13px; line-height: 1.72; word-break: break-word; }
.pca-msg.user {
  align-self: flex-end;
  padding: 8px 12px;
  border: 1px solid color-mix(in srgb, var(--lime, var(--sign)) 34%, transparent);
  border-radius: 10px 10px 3px 10px;
  background: color-mix(in srgb, var(--lime, var(--sign)) 11%, transparent);
  white-space: pre-wrap;
}
.pca-msg.bot {
  align-self: flex-start;
  padding-left: 11px;
  border-left: 2px solid color-mix(in srgb, var(--cyan) 55%, transparent);
  color: var(--text);
}
.pca-msg.bot.err { border-left-color: #ff6f5e; color: #ffb3a8; }
.pca-msg.bot p { margin: 0 0 8px; }
.pca-msg.bot p:last-child { margin-bottom: 0; }
.pca-msg.bot ul { margin: 0 0 8px; padding-left: 17px; }
.pca-msg.bot li { margin: 3px 0; }
.pca-msg.bot code.inl {
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(150, 190, 255, .07);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--cyan);
}
.pca-msg.bot pre {
  margin: 8px 0;
  padding: 10px 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(4, 10, 20, .72);
  overflow-x: auto;
}
.pca-msg.bot pre code {
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.65;
  color: #d7e6ff;
  white-space: pre;
}
html.light .pca-msg.bot pre { background: #0d1729; }
html.light .pca-msg.bot pre code { color: #d7e6ff; }
.pca-caret {
  display: inline-block;
  width: 6px; height: 13px;
  margin-left: 2px;
  background: var(--lime, var(--sign));
  vertical-align: -2px;
  animation: pcaBlink .9s steps(2, start) infinite;
}
@keyframes pcaBlink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }
.pca-thinking { display: inline-flex; gap: 4px; padding: 4px 0; }
.pca-thinking i {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--muted);
  animation: pcaBounce 1.1s infinite ease-in-out;
}
.pca-thinking i:nth-child(2) { animation-delay: .15s; }
.pca-thinking i:nth-child(3) { animation-delay: .3s; }
@keyframes pcaBounce { 0%, 80%, 100% { transform: translateY(0); opacity: .4; } 40% { transform: translateY(-4px); opacity: 1; } }

.pca-quick { display: flex; flex-wrap: wrap; gap: 7px; padding: 0 14px 10px; }
.pca-quick button {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: var(--display, var(--head));
  font-size: 11.5px;
  cursor: pointer;
  transition: color .2s, border-color .2s, background .2s;
}
.pca-quick button:hover {
  color: var(--lime, var(--sign));
  border-color: var(--lime, var(--sign));
  background: rgba(201, 242, 77, .07);
}

.pca-foot {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 10px 12px 8px;
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--ink) 70%, transparent);
}
.pca-input {
  flex: 1;
  min-height: 38px;
  max-height: 96px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(150, 190, 255, .04);
  color: var(--text);
  font-family: var(--display, var(--head));
  font-size: 13px;
  line-height: 1.5;
  resize: none;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.pca-input::placeholder { color: var(--dim); }
.pca-input:focus { border-color: var(--lime, var(--sign)); box-shadow: 0 0 0 3px rgba(201, 242, 77, .1); }
.pca-send {
  flex: none;
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border: 1px solid var(--lime, var(--sign));
  border-radius: 8px;
  background: var(--lime, var(--sign));
  color: #071004;
  font-size: 15px;
  cursor: pointer;
  transition: filter .2s, transform .2s;
}
.pca-send:hover { filter: brightness(1.08); }
.pca-send:active { transform: scale(.95); }
.pca-send:disabled { opacity: .45; cursor: not-allowed; }
.pca-note {
  padding: 0 12px 9px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .06em;
  color: var(--dim);
}
.pca-note a { color: var(--muted); text-decoration: underline; text-underline-offset: 2px; }
.pca-note a:hover { color: var(--lime, var(--sign)); }

/* ── 移动端：避开底部 CTA / dock ─────────────────────── */
@media (max-width: 900px) {
  .pca-fab {
    right: 14px;
    bottom: calc(76px + env(safe-area-inset-bottom));
    height: 44px;
    padding: 0 14px 0 11px;
    font-size: 12px;
  }
  .pca-fab-mark { width: 22px; height: 22px; }
  .pca-panel {
    left: 8px;
    right: 8px;
    bottom: calc(130px + env(safe-area-inset-bottom));
    width: auto;
    height: min(70dvh, calc(100dvh - 210px));
    border-radius: 12px;
  }
}
@media (max-width: 420px) {
  .pca-fab { right: 10px; }
  .pca-panel { left: 6px; right: 6px; }
}
@media (prefers-reduced-motion: reduce) {
  .pca-panel, .pca-fab { transition: none; }
  .pca-dot, .pca-caret, .pca-thinking i { animation: none; }
}