/* =====================================================================
   智能客服 · 悬浮组件样式
   右下角悬浮入口 + 可收起对话面板，适配移动端与 prefers-reduced-motion
   ===================================================================== */

.support-root {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 250;
  font-family: inherit;
}

/* ---------------- 悬浮入口按钮 ---------------- */
.support-launcher {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--g-brand);
  box-shadow: var(--sh-brand);
  transition: transform var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease);
  position: relative;
}
.support-launcher:hover { transform: translateY(-3px) scale(1.04); }
.support-launcher:active { transform: translateY(-1px) scale(.98); }
.support-launcher:focus-visible {
  outline: 3px solid var(--c-primary-light);
  outline-offset: 3px;
}
.support-launcher-icon { display: grid; place-items: center; }

.support-launcher-badge {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-warn);
  border: 2px solid var(--c-surface);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.support-root.has-unread .support-launcher-badge { opacity: 1; }

/* ---------------- 对话面板 ---------------- */
.support-panel {
  position: absolute;
  right: 0;
  bottom: 70px;
  width: min(380px, calc(100vw - 32px));
  /* 用 height 而非仅 max-height：消息少时面板会收缩到内容高度，
     打开后只能看到一两条消息、留大片空白，视觉上"太矮"。
     固定高度让消息区始终有足够的可视空间。 */
  height: min(660px, calc(100vh - 140px));
  max-height: calc(100vh - 140px);
  display: flex;
  flex-direction: column;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-lg);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px) scale(.97);
  transform-origin: bottom right;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease-out), visibility var(--dur);
}
.support-root.is-open .support-panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

/* ---------------- 面板头部 ---------------- */
.support-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  background: var(--g-dark);
  color: #fff;
  flex-shrink: 0;
}
.support-head-info { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.support-head-title { font-size: .95rem; font-weight: 700; letter-spacing: .01em; }

.support-status {
  font-size: .72rem;
  color: #9fb4dd;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.support-status::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(0, 194, 168, .2);
}
.support-status.is-warn { color: #ffd08a; }
.support-status.is-warn::before { background: var(--c-warn); box-shadow: 0 0 0 3px rgba(247, 144, 9, .22); }

/* 当前生效的模型标识（由服务端 /api/support/config 下发） */
.support-status-model {
  font-size: .68rem;
  opacity: .72;
  font-variant-numeric: tabular-nums;
  padding-left: 4px;
}

.support-close {
  width: 30px; height: 30px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, .16);
  background: rgba(255, 255, 255, .06);
  color: #cfdcf5;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
  flex-shrink: 0;
}
.support-close:hover { background: rgba(255, 255, 255, .14); color: #fff; }

/* ---------------- 消息列表 ---------------- */
.support-messages {
  flex: 1 1 auto;
  /* 消息区至少占满剩余空间，撑起固定高度的面板 */
  min-height: 320px;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--c-surface-2);
  scroll-behavior: smooth;
}

.support-empty {
  margin: auto;
  font-size: .84rem;
  color: var(--c-text-3);
  text-align: center;
}

.support-bubble {
  max-width: 86%;
  padding: 10px 13px;
  border-radius: 14px;
  font-size: .875rem;
  line-height: 1.6;
  word-break: break-word;
  white-space: pre-wrap;
  animation: support-in .28s var(--ease-out);
}
@keyframes support-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.support-bubble.is-bot {
  align-self: flex-start;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-bottom-left-radius: 5px;
  color: var(--c-text);
}
.support-bubble.is-user {
  align-self: flex-end;
  background: var(--c-primary);
  color: #fff;
  border-bottom-right-radius: 5px;
}
.support-bubble.is-agent {
  align-self: flex-start;
  background: #fff7ed;
  border: 1px solid #fed7aa;
  border-bottom-left-radius: 5px;
  color: #7c2d12;
}
.support-bubble.is-system {
  align-self: center;
  max-width: 94%;
  background: transparent;
  border: 1px dashed var(--c-border);
  color: var(--c-text-3);
  font-size: .78rem;
  text-align: center;
}

.support-bubble-text { white-space: pre-wrap; }
.support-bubble-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
  font-size: .68rem;
  opacity: .78;
  flex-wrap: wrap;
}
.support-bubble.is-user .support-bubble-meta { justify-content: flex-end; }

.support-tag {
  padding: 1px 6px;
  border-radius: var(--r-full);
  background: rgba(47, 107, 255, .1);
  font-weight: 600;
}
.support-tag.is-warn { background: rgba(247, 144, 9, .16); color: #b45309; }
.support-time { opacity: .7; }

/* 加载态：三点跳动 */
.support-bubble.is-loading {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 12px 14px;
  align-self: flex-start;
}
.support-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-text-3);
  animation: support-bounce 1.1s infinite ease-in-out;
}
.support-dot:nth-child(2) { animation-delay: .16s; }
.support-dot:nth-child(3) { animation-delay: .32s; }
@keyframes support-bounce {
  0%, 70%, 100% { transform: translateY(0); opacity: .45; }
  35% { transform: translateY(-4px); opacity: 1; }
}

/* 错误态 */
.support-error {
  align-self: stretch;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: 10px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #b91c1c;
  font-size: .8rem;
}
.support-error-icon {
  width: 18px; height: 18px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--c-error);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: .7rem;
  font-weight: 700;
}
.support-error-text { flex: 1; min-width: 0; }

/* ---------------- 满意度 ---------------- */
.support-rate {
  padding: 12px 16px;
  border-top: 1px solid var(--c-border);
  background: var(--c-surface);
  flex-shrink: 0;
}
.support-rate[hidden] { display: none; }
.support-rate-title { font-size: .8rem; color: var(--c-text-2); margin-bottom: 8px; }

.support-stars { display: flex; gap: 4px; margin-bottom: 8px; }
.support-star {
  width: 30px; height: 30px;
  border: none;
  background: transparent;
  color: var(--c-text-3);
  cursor: pointer;
  padding: 0;
  transition: color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.support-star:hover { color: var(--c-warn); transform: scale(1.12); }
.support-star:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; border-radius: 6px; }

.support-rate-tags { display: flex; gap: 8px; }
.support-rate-tag {
  padding: 5px 12px;
  border-radius: var(--r-full);
  border: 1px solid var(--c-border);
  background: var(--c-surface-2);
  color: var(--c-text-2);
  font-size: .76rem;
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease);
}
.support-rate-tag:hover { border-color: var(--c-primary); color: var(--c-primary); }

/* ---------------- 输入区 ---------------- */
.support-composer {
  border-top: 1px solid var(--c-border);
  padding: 10px 12px 12px;
  background: var(--c-surface);
  flex-shrink: 0;
}

.support-input {
  width: 100%;
  min-height: 44px;
  max-height: 120px;
  padding: 10px 12px;
  border: 1px solid var(--c-border);
  border-radius: 12px;
  background: var(--c-surface-2);
  color: var(--c-text);
  font: inherit;
  font-size: .875rem;
  line-height: 1.5;
  resize: none;
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.support-input:focus {
  outline: none;
  border-color: var(--c-primary);
  background: var(--c-surface);
}
.support-input:disabled { opacity: .6; cursor: not-allowed; }

.support-actions {
  display: flex;
  gap: 8px;
  margin-top: 9px;
  align-items: center;
}
.support-btn {
  border-radius: var(--r-full);
  border: 1px solid transparent;
  font-size: .8rem;
  padding: 7px 15px;
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease);
  white-space: nowrap;
}
.support-btn:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; }
.support-btn:disabled { opacity: .5; cursor: not-allowed; }

.support-btn-primary {
  margin-left: auto;
  background: var(--c-primary);
  color: #fff;
  font-weight: 600;
}
.support-btn-primary:hover:not(:disabled) { background: var(--c-primary-dark); }

.support-btn-ghost {
  background: transparent;
  border-color: var(--c-border);
  color: var(--c-text-2);
}
.support-btn-ghost:hover:not(:disabled) { border-color: var(--c-primary); color: var(--c-primary); }

.support-btn-warn {
  background: #fff7ed;
  border-color: #fed7aa;
  color: #c2410c;
}
.support-btn-warn:hover:not(:disabled) { background: #ffedd5; }

.support-btn-xs { padding: 4px 10px; font-size: .72rem; }

/* 悬浮客服存在时，「回到顶部」按钮上移避让 */
body.has-support .to-top { bottom: 92px; }

@media (max-width: 720px) {
  body.has-support .to-top { bottom: 80px; }
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 720px) {
  .support-root { right: 14px; bottom: 14px; }
  .support-launcher { width: 50px; height: 50px; }
  .support-panel {
    bottom: 62px;
    width: calc(100vw - 28px);
    /* 小屏按视口比例给高度，但仍要留出输入区与头部的空间 */
    height: min(72vh, calc(100vh - 110px));
    max-height: calc(100vh - 110px);
  }
  .support-messages { min-height: 200px; }
  .support-bubble { max-width: 90%; }
}

@media (max-width: 420px) {
  .support-panel { width: calc(100vw - 20px); }
  .support-actions { flex-wrap: wrap; }
  .support-btn-primary { margin-left: 0; flex: 1; }
}

/* 无障碍：降低动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .support-panel,
  .support-launcher,
  .support-bubble,
  .support-dot {
    animation: none !important;
    transition: none !important;
  }
  .support-messages { scroll-behavior: auto; }
}