/* ============================================================================
   博庚创投 · 官网 AI 客服组件
   与站点主题一致：深色玻璃质感 + 品牌渐变强调色。
   ========================================================================= */
.bgc-root { position: fixed; z-index: 900; right: 0; bottom: 0; font-family: var(--font-body); }

.bgc-launch {
  display: inline-flex; align-items: center; gap: 10px;
  height: 54px; padding: 0 20px; border-radius: 999px;
  color: #fff; cursor: pointer; border: 1px solid color-mix(in oklab, var(--fg) 12%, transparent);
  background: linear-gradient(135deg, oklch(0.568 0.227 23), oklch(0.668 0.212 40));
  box-shadow: 0 14px 34px -12px oklch(0.568 0.227 23 / 0.7), inset 0 1px 0 rgba(255,255,255,0.25);
  transition: transform .3s var(--ease-out), box-shadow .3s var(--ease-out);
}
.bgc-launch:hover { transform: translateY(-2px); box-shadow: 0 20px 44px -12px oklch(0.568 0.227 23 / 0.8), inset 0 1px 0 rgba(255,255,255,0.3); }
.bgc-launch svg { flex: none; }
.bgc-launch-label { font-size: 14px; font-weight: 600; letter-spacing: .01em; white-space: nowrap; }
@media (max-width: 520px) { .bgc-launch-label { display: none; } .bgc-launch { padding: 0; width: 54px; justify-content: center; } }

.bgc-panel {
  position: fixed; top: 74px; right: clamp(16px, 3vw, 32px); bottom: auto;
  width: min(400px, calc(100vw - 32px)); height: min(640px, calc(100vh - 100px));
  display: flex; flex-direction: column; overflow: hidden;
  border-radius: 20px; border: 1px solid color-mix(in oklab, var(--fg) 12%, transparent);
  background: color-mix(in oklab, var(--bg-deep) 92%, transparent);
  -webkit-backdrop-filter: blur(20px) saturate(1.3); backdrop-filter: blur(20px) saturate(1.3);
  box-shadow: 0 30px 80px -30px rgba(0,0,0,.7);
  transform-origin: 100% 0; /* 从导航按钮处展开 */
  opacity: 0; visibility: hidden; pointer-events: none;
  will-change: transform, opacity, border-radius; backface-visibility: hidden;
}
.bgc-panel.is-open { opacity: 1; visibility: visible; pointer-events: auto; }

.bgc-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 14px 16px; border-bottom: 1px solid var(--hair); }
.bgc-head-l { display: flex; align-items: center; gap: 10px; }
.bgc-dot { width: 8px; height: 8px; border-radius: 50%; background: oklch(0.72 0.17 150); box-shadow: 0 0 0 4px oklch(0.72 0.17 150 / 0.18); }
.bgc-title { font-size: 14px; font-weight: 600; color: var(--fg); }
.bgc-head-btn { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; border-radius: 8px; color: var(--muted); background: transparent; border: 1px solid transparent; cursor: pointer; transition: var(--ease) .2s; }
.bgc-head-btn:hover { color: var(--fg); border-color: var(--border); background: var(--fg-soft); }

.bgc-sessions { border-bottom: 1px solid var(--hair); max-height: 200px; overflow-y: auto; padding: 8px; display: none; }
.bgc-sessions.is-open { display: block; }
.bgc-sessions-head { display: flex; align-items: center; justify-content: space-between; padding: 2px 6px 8px; }
.bgc-sessions-head span { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.bgc-new { font-size: 12px; color: var(--accent-2); background: none; border: 0; cursor: pointer; }
.bgc-session { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 8px; cursor: pointer; font-size: 13px; color: var(--muted); }
.bgc-session:hover { background: var(--fg-soft); color: var(--fg); }
.bgc-session.is-active { background: color-mix(in oklab, var(--accent) 14%, transparent); color: var(--fg); }
.bgc-session-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bgc-session-del { color: var(--muted); background: none; border: 0; cursor: pointer; opacity: 0; }
.bgc-session:hover .bgc-session-del { opacity: .8; }

.bgc-body { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.bgc-welcome { border: 1px solid var(--hair); border-radius: 14px; padding: 16px; background: var(--fg-soft); }
.bgc-welcome h4 { margin: 0 0 8px; font-size: 14px; color: var(--fg); }
.bgc-welcome p { margin: 0; font-size: 13px; line-height: 1.7; color: var(--muted); }
.bgc-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.bgc-chip { font-size: 12px; color: var(--fg); background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 6px 12px; cursor: pointer; transition: var(--ease) .2s; }
.bgc-chip:hover { border-color: var(--accent); color: var(--accent-2); }

.bgc-msg { max-width: 86%; padding: 10px 13px; border-radius: 12px; font-size: 13.5px; line-height: 1.75; white-space: normal; word-break: break-word; }
.bgc-msg--user { align-self: flex-end; background: linear-gradient(135deg, oklch(0.568 0.227 23), oklch(0.668 0.212 40)); color: #fff; border-bottom-right-radius: 4px; }
.bgc-msg--bot { align-self: flex-start; background: var(--surface); border: 1px solid var(--hair); color: var(--fg); border-bottom-left-radius: 4px; }
.bgc-msg p { margin: 0 0 8px; } .bgc-msg p:last-child { margin-bottom: 0; }
.bgc-msg h2, .bgc-msg h3 { font-size: 14px; margin: 10px 0 6px; color: var(--fg); }
.bgc-msg ul, .bgc-msg ol { margin: 6px 0; padding-left: 20px; }
.bgc-msg code { font-family: var(--font-mono); font-size: 12px; background: var(--fg-soft); padding: 1px 5px; border-radius: 4px; }
.bgc-msg pre { background: oklch(0.115 0.010 48); border: 1px solid var(--border); border-radius: 8px; padding: 10px; overflow-x: auto; }
.bgc-msg pre code { background: none; padding: 0; }
.bgc-msg a { color: var(--accent-2); text-decoration: underline; text-underline-offset: 2px; }
.bgc-msg blockquote { margin: 8px 0; padding: 4px 12px; border-left: 3px solid var(--accent); color: var(--muted); }
.bgc-think { font-size: 12px; color: var(--muted); border: 1px dashed var(--border); border-radius: 8px; padding: 8px 10px; margin-bottom: 8px; white-space: pre-wrap; }
.bgc-loading { display: inline-flex; gap: 4px; align-items: center; }
.bgc-loading i { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); animation: bgc-blink 1s infinite; }
.bgc-loading i:nth-child(2) { animation-delay: .2s; } .bgc-loading i:nth-child(3) { animation-delay: .4s; }
@keyframes bgc-blink { 0%,80%,100% { opacity: .3; } 40% { opacity: 1; } }

.bgc-foot { border-top: 1px solid var(--hair); padding: 12px; display: flex; gap: 10px; align-items: flex-end; }
.bgc-input { flex: 1; resize: none; min-height: 40px; max-height: 120px; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface); color: var(--fg); font: inherit; font-size: 13.5px; outline: none; }
.bgc-input:focus { border-color: var(--accent); }
.bgc-send { flex: none; width: 40px; height: 40px; border-radius: 10px; border: 0; cursor: pointer; color: #fff; background: linear-gradient(135deg, oklch(0.568 0.227 23), oklch(0.668 0.212 40)); display: inline-flex; align-items: center; justify-content: center; }
.bgc-send:disabled { opacity: .45; cursor: not-allowed; }
.bgc-note { font-size: 11px; color: var(--muted); text-align: center; padding: 0 12px 10px; }

/* AI 动作按钮（如表单） */
.bgc-action {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 10px;
  padding: 8px 14px; border-radius: 10px; cursor: pointer; font-size: 13px; font-weight: 600;
  color: #fff; border: 0; background: linear-gradient(135deg, oklch(0.568 0.227 23), oklch(0.668 0.212 40));
}
.bgc-action:hover { filter: brightness(1.05); }

/* 内嵌投递 BP 表单 */
.bgc-lead { border: 1px solid var(--hair); border-radius: 12px; padding: 14px; background: var(--surface); }
.bgc-lead-title { font-size: 14px; font-weight: 600; color: var(--fg); margin-bottom: 4px; }
.bgc-lead-note { margin: 0 0 10px; font-size: 12px; color: var(--muted); line-height: 1.6; }
.bgc-lead-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.bgc-lead-input {
  width: 100%; box-sizing: border-box; padding: 9px 11px; margin-bottom: 8px;
  border-radius: 8px; border: 1px solid var(--border); background: var(--bg); color: var(--fg);
  font: inherit; font-size: 13px; outline: none;
}
.bgc-lead-input:focus { border-color: var(--accent); }
.bgc-lead-actions { display: flex; justify-content: flex-end; }
.bgc-lead-submit { padding: 8px 18px; border-radius: 8px; border: 0; cursor: pointer; color: #fff; font-size: 13px; font-weight: 600; background: linear-gradient(135deg, oklch(0.568 0.227 23), oklch(0.668 0.212 40)); }
.bgc-lead-submit:disabled { opacity: .5; cursor: not-allowed; }
.bgc-lead-msg { font-size: 12px; margin-top: 8px; }


/* 打开时的渐入（配合 JS 设置的 animation-delay 做错落） */
.bgc-welcome, .bgc-msg { animation: bgc-msgin .38s var(--ease-out) both; }
@keyframes bgc-msgin { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .bgc-welcome, .bgc-msg { animation: none; } }

/* 自定义细滚动条（替代浏览器默认样式） */
.bgc-body, .bgc-sessions, .bgc-input, .bgc-lead-input, .bgc-msg pre {
  scrollbar-width: thin;
  scrollbar-color: color-mix(in oklab, var(--fg) 20%, transparent) transparent;
}
.bgc-body::-webkit-scrollbar, .bgc-sessions::-webkit-scrollbar,
.bgc-input::-webkit-scrollbar, .bgc-msg pre::-webkit-scrollbar { width: 6px; height: 6px; }
.bgc-body::-webkit-scrollbar-track, .bgc-sessions::-webkit-scrollbar-track,
.bgc-input::-webkit-scrollbar-track, .bgc-msg pre::-webkit-scrollbar-track { background: transparent; }
.bgc-body::-webkit-scrollbar-thumb, .bgc-sessions::-webkit-scrollbar-thumb,
.bgc-input::-webkit-scrollbar-thumb, .bgc-msg pre::-webkit-scrollbar-thumb {
  background: color-mix(in oklab, var(--fg) 18%, transparent); border-radius: 999px;
}
.bgc-body::-webkit-scrollbar-thumb:hover, .bgc-sessions::-webkit-scrollbar-thumb:hover {
  background: color-mix(in oklab, var(--fg) 30%, transparent);
}
.bgc-panel { scrollbar-color: auto; }

/* 思考过程（折叠） */
.bgc-think { border: 1px dashed var(--border); border-radius: 8px; padding: 0; margin-bottom: 8px; background: transparent; }
.bgc-think > summary {
  cursor: pointer; list-style: none; padding: 7px 10px; font-size: 12px; color: var(--muted);
  user-select: none; outline: none;
}
.bgc-think > summary::-webkit-details-marker { display: none; }
.bgc-think > summary::before { content: '▸ '; }
.bgc-think[open] > summary::before { content: '▾ '; }
.bgc-think-body { padding: 0 10px 9px; font-size: 12px; color: var(--muted); white-space: pre-wrap; line-height: 1.7; }


/* 移动端：AI 顾问全屏展开 */
@media (max-width: 640px) {
  .bgc-panel {
    top: 0; right: 0; left: 0; bottom: 0;
    width: 100%; height: 100dvh; max-height: none;
    border-radius: 0; border: 0;
    transform-origin: 50% 0;
  }
  .bgc-head { padding-top: max(14px, env(safe-area-inset-top)); }
  .bgc-foot { padding-bottom: max(12px, env(safe-area-inset-bottom)); }
}

/* 导航栏入口按钮 */
/* 导航入口：复用站点 .btn/.btn-sm 规范，保证高度与「投递 BP」一致 */
.nav-chat svg, .nav-cta-icon { color: var(--accent-2); flex: none; }
.nav-chat:hover, .nav-cta:hover { border-color: var(--accent); color: var(--fg); }
/* 小屏：导航内两个按钮统一收成图标，保持高度/尺寸一致 */
@media (max-width: 560px) {
  .nav-actions .nav-chat span, .nav-actions .nav-cta-label { display: none; }
  .nav-actions .nav-chat, .nav-actions .nav-cta { padding: 0 12px; }
}