.support-widget {
  --support-blue: #175cd3;
  --support-dark: #15171b;
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 180;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

.support-fab {
  position: relative;
  width: 56px;
  height: 56px;
  margin-left: auto;
  border: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--support-blue);
  color: white;
  box-shadow: 0 12px 32px rgba(23, 92, 211, .3);
  cursor: pointer;
  transition: transform .2s ease, background .2s ease;
}

.support-fab:hover { background: #123f91; transform: translateY(-2px); }
.support-fab:focus-visible, .support-panel button:focus-visible, .support-composer textarea:focus-visible { outline: 3px solid rgba(23, 92, 211, .28); outline-offset: 2px; }
.support-fab svg { width: 24px; height: 24px; }
.support-unread { position: absolute; top: -5px; right: -5px; min-width: 22px; height: 22px; padding: 0 6px; border: 2px solid white; border-radius: 11px; display: grid; place-items: center; background: #d92d20; color: white; font-size: 10px; font-weight: 700; }

.support-panel {
  width: 380px;
  height: min(640px, calc(100dvh - 104px));
  margin-bottom: 14px;
  border: 1px solid #d9dde5;
  border-radius: 8px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  overflow: hidden;
  background: #fff;
  color: var(--support-dark);
  box-shadow: 0 24px 72px rgba(15, 23, 42, .22);
  animation: support-panel-in .2s ease;
}

.support-panel-header { min-height: 78px; padding: 14px 12px 14px 16px; display: grid; grid-template-columns: 42px minmax(0, 1fr) auto; align-items: center; gap: 11px; column-gap: 18px; background: #15171b; color: white; }
.support-agent-mark { width: 42px; height: 42px; border-radius: 6px; display: grid; place-items: center; background: #2369d8; }
.support-agent-mark svg { width: 20px; }
.support-panel-copy { min-width: 0; display: grid; gap: 4px; }
.support-panel-header h2 { margin: 0; font-size: 15px; line-height: 20px; letter-spacing: 0; }
.support-presence { position: relative; min-width: 0; margin: 0; display: flex; align-items: center; gap: 6px; color: #cbd1dc; font-size: 11px; line-height: 16px; }
.support-presence i { position: absolute; top: 50%; left: -12px; width: 7px; height: 7px; border-radius: 50%; background: #8b95a5; transform: translateY(-50%); }
.support-presence.online i { background: #32d583; }
.support-presence.waiting i { background: #fdb022; }
.support-presence.error i { background: #f97066; }
.support-presence span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.support-panel-actions { display: flex; align-items: center; gap: 2px; }
.support-panel-actions button { width: 34px; height: 34px; padding: 0; border: 0; border-radius: 5px; display: grid; place-items: center; background: transparent; color: #d6dae2; cursor: pointer; }
.support-panel-actions button:hover { background: rgba(255,255,255,.1); color: white; }
.support-panel-actions svg { width: 18px; }

.support-messages { min-height: 0; padding: 18px 16px 24px; overflow-y: auto; overscroll-behavior: contain; background: #f7f8fa; scrollbar-width: thin; }
.support-welcome { padding: 14px; border: 1px solid #e1e4e9; border-radius: 7px; display: flex; align-items: flex-start; gap: 11px; background: white; }
.support-welcome > span { width: 32px; height: 32px; flex: 0 0 auto; border-radius: 5px; display: grid; place-items: center; background: #15171b; color: white; font-size: 10px; font-weight: 700; }
.support-welcome strong { display: block; margin: 0 0 5px; font-size: 13px; }
.support-welcome p { margin: 0; color: #687080; font-size: 12px; line-height: 1.6; }
.support-system-note { width: fit-content; max-width: 92%; margin: 14px auto; padding: 7px 10px; border-radius: 4px; display: flex; align-items: center; gap: 6px; background: #e9edf3; color: #626b79; font-size: 10px; line-height: 1.45; text-align: center; }
.support-system-note svg { width: 13px; height: 13px; flex: 0 0 auto; }

.support-message { width: 100%; max-width: none; margin-top: 16px; display: flex; align-items: flex-end; gap: 8px; }
.support-message.own { justify-content: flex-end; padding-left: 40px; }
.support-message.agent { justify-content: flex-start; padding-right: 40px; }
.support-message-avatar { width: 26px; height: 26px; flex: 0 0 auto; border-radius: 50%; display: grid; place-items: center; background: #e7edf8; color: #175cd3; font-size: 10px; font-weight: 700; }
.support-message > div { max-width: 100%; display: flex; flex-direction: column; }
.support-message.own > div { margin-left: auto; align-items: flex-end; }
.support-message.agent > div { margin-right: auto; align-items: flex-start; }
.support-message p { width: fit-content; max-width: 100%; margin: 0; padding: 10px 12px; border: 1px solid #dde1e7; border-radius: 6px 6px 6px 2px; background: white; font-size: 13px; line-height: 1.55; white-space: pre-wrap; overflow-wrap: anywhere; }
.support-message.own p { border-color: #175cd3; border-radius: 6px 6px 2px 6px; background: #175cd3; color: white; }
.support-message small { min-height: 18px; margin-top: 4px; display: flex; align-items: center; gap: 5px; color: #89909c; font-size: 9px; }
.support-message.own small { justify-content: flex-end; }
.support-message small svg { width: 12px; height: 12px; }
.support-message small button { padding: 0; border: 0; display: inline-flex; align-items: center; gap: 3px; background: none; color: #b42318; font-size: 9px; cursor: pointer; }

.support-error { min-height: 42px; padding: 8px 12px; border-top: 1px solid #fecdca; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 7px; background: #fff4f3; color: #b42318; font-size: 10px; }
.support-error > svg { width: 15px; }
.support-error button { padding: 4px 7px; border: 0; display: inline-flex; align-items: center; gap: 4px; background: transparent; color: #912018; font-size: 10px; font-weight: 700; cursor: pointer; }
.support-error button svg { width: 12px; }

.support-composer { position: relative; min-height: 88px; padding: 12px 14px 28px; border-top: 1px solid #e0e3e8; display: grid; grid-template-columns: minmax(0, 1fr) 48px; align-items: stretch; gap: 8px; background: white; }
.support-composer > label { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.support-composer textarea { width: 100%; height: 48px; min-height: 48px; max-height: 96px; padding: 13px 12px; border: 1px solid #cfd5de; border-radius: 6px; resize: none; color: #15171b; background: #fafbfc; font: inherit; font-size: 13px; line-height: 20px; transition: border-color .2s ease, box-shadow .2s ease, background .2s ease; }
.support-composer textarea::placeholder { color: #9299a5; }
.support-composer textarea:focus { border-color: #175cd3; background: #fff; box-shadow: 0 0 0 3px rgba(23, 92, 211, .12); outline: 0; }
.support-composer textarea:disabled { opacity: .7; cursor: wait; }
.support-composer > button { width: 48px; height: 48px; border: 0; border-radius: 6px; display: grid; place-items: center; background: #175cd3; color: white; cursor: pointer; transition: background .2s ease, transform .2s ease; }
.support-composer > button:hover { background: #123f91; }
.support-composer > button:active { transform: translateY(1px); }
.support-composer > button:disabled { background: #c7ced9; cursor: not-allowed; }
.support-composer > button svg { width: 19px; height: 19px; }
.support-composer > small { position: absolute; left: 14px; bottom: 8px; color: #9aa1ac; font-size: 9px; }

.spin { animation: support-spin .8s linear infinite; }
@keyframes support-spin { to { transform: rotate(360deg); } }
@keyframes support-panel-in { from { opacity: 0; transform: translateY(10px) scale(.98); } }

@media (max-width: 800px) {
  body.support-chat-open { overflow: hidden; }
  .support-widget { right: 16px; bottom: 94px; z-index: 210; }
  .support-widget.is-open { inset: 0; }
  .support-widget.is-open .support-fab { display: none; }
  .support-panel { position: fixed; inset: 0; width: 100%; height: 100dvh; max-height: none; margin: 0; border: 0; border-radius: 0; grid-template-rows: auto minmax(0, 1fr) auto auto; box-shadow: none; animation: support-mobile-in .2s ease; }
  .support-panel-header { min-height: calc(68px + env(safe-area-inset-top)); padding-top: calc(10px + env(safe-area-inset-top)); }
  .support-panel-actions button:first-child { display: none; }
  .support-panel-actions button:last-child::after { content: ''; }
  .support-messages { padding: 18px 16px 28px; }
  .support-composer { padding-bottom: calc(28px + env(safe-area-inset-bottom)); }
  .support-composer > small { bottom: calc(8px + env(safe-area-inset-bottom)); }
  .support-message.own { padding-left: 32px; }
  .support-message.agent { padding-right: 32px; }
  @keyframes support-mobile-in { from { opacity: 0; transform: translateY(14px); } }
}

@media (prefers-reduced-motion: reduce) {
  .support-panel, .support-fab, .spin { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}