:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}
*, *::before, *::after { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; min-height: 100vh; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
a { color: inherit; }
img, svg { display: block; max-width: 100%; }
[hidden] { display: none !important; }
.sr-only { position: absolute !important; width: 1px !important; height: 1px !important; overflow: hidden !important; clip: rect(0 0 0 0) !important; white-space: nowrap !important; }

:focus-visible {
  outline: 3px solid var(--focus-color, #ff5c7a);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 999px;
  background: #10131a;
  color: #fff;
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.bookmark-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  cursor: pointer;
}

.support-fab {
  position: fixed;
  z-index: 50;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  display: inline-flex;
  min-width: 54px;
  min-height: 54px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  background: #11141c;
  color: #fff;
  box-shadow: 0 16px 40px rgb(0 0 0 / 22%);
  cursor: pointer;
}
.support-fab::before {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #62ed9b;
  box-shadow: 0 0 0 4px rgb(98 237 155 / 16%);
  content: "";
}
.support-fab__icon { display: none; }

.support-panel {
  position: fixed;
  z-index: 60;
  right: max(18px, env(safe-area-inset-right));
  bottom: calc(max(18px, env(safe-area-inset-bottom)) + 68px);
  width: min(380px, calc(100vw - 36px));
  max-height: calc(100svh - 110px);
  overflow: auto;
  border: 1px solid var(--support-border, rgb(255 255 255 / 68%));
  border-radius: 26px;
  background: var(--support-surface, rgb(250 249 255 / 98%));
  color: var(--support-text, #191927);
  box-shadow: 0 24px 80px rgb(13 18 31 / 24%);
  backdrop-filter: blur(20px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px) scale(.985);
  transform-origin: bottom center;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease, visibility .2s step-end;
}
.support-panel.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
  transition: opacity .2s ease, transform .2s ease, visibility 0s;
}
.support-panel__header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 17px 18px;
  background: var(--support-header, linear-gradient(135deg,#8256ff,#6634ee));
  color: #fff;
}
.support-panel__header h2 { margin: 0; font-size: 1.05rem; }
.support-panel__status { display: inline-flex; align-items: center; gap: 6px; margin-right: auto; font-size: .78rem; }
.support-panel__status i { width: 9px; height: 9px; border-radius: 50%; background: #43eea0; box-shadow: 0 0 0 4px rgb(67 238 160 / 13%); }
.support-panel__close {
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 50%;
  background: rgb(255 255 255 / 12%);
  color: #fff;
  font-size: 1.55rem;
  line-height: 1;
  cursor: pointer;
}
.support-panel__body { padding: 20px; }
.support-panel__conversation { display: grid; grid-template-columns: 62px minmax(0,1fr); align-items: start; gap: 11px; }
.support-panel__avatar { width: 62px; height: 62px; }
.support-panel__greeting { padding: 13px 15px; border: 1px solid var(--support-soft-border,#ebe8f5); border-radius: 8px 18px 18px; background: var(--support-bubble,#fff); box-shadow: 0 8px 22px rgb(55 38 92 / 7%); }
.support-panel__greeting p { margin: 0; color: var(--support-text,#191927); font-size: .84rem; line-height: 1.65; }
.support-panel__prompt { margin: 18px 0 9px; color: var(--support-muted,#666477); font-size: .75rem; font-weight: 750; }
.support-panel__options { display: grid; gap: 8px; }
.support-panel__options button {
  min-height: 44px;
  border: 1px solid var(--support-option-border,#9b78ff);
  border-radius: 999px;
  background: var(--support-option,#fff);
  color: var(--support-text,#222631);
  text-align: left;
  padding: 10px 15px;
  cursor: pointer;
}
.support-panel__options button:hover { background: var(--support-option-hover,#f4efff); }
.support-panel__reply { margin: 12px 0 0; padding: 10px 12px; border-radius: 13px; background: var(--support-reply,#eee8ff); color: var(--support-text,#30303a); font-size: .78rem; line-height: 1.5; }
.support-panel__composer { display: grid; grid-template-columns: minmax(0,1fr) 42px 42px; gap: 7px; margin-top: 15px; padding: 7px; border: 1px solid var(--support-soft-border,#e8e4f1); border-radius: 17px; background: var(--support-bubble,#fff); box-shadow: 0 8px 24px rgb(55 38 92 / 8%); }
.support-panel__composer input { min-width: 0; border: 0; outline: 0; background: transparent; color: var(--support-text,#20202b); padding: 0 7px; }
.support-panel__composer input::placeholder { color: var(--support-muted,#8b8996); }
.support-panel__composer button { display: grid; width: 42px; height: 42px; place-items: center; border: 0; border-radius: 50%; cursor: pointer; }
.support-panel__emoji { background: transparent; color: var(--support-muted,#737080); font-size: 1.25rem; }
.support-panel__send { background: var(--support-send,#7347ef); color: #fff; font-size: 1.05rem; }

.toast {
  position: fixed;
  z-index: 80;
  left: 50%;
  bottom: max(24px, env(safe-area-inset-bottom));
  max-width: calc(100vw - 32px);
  padding: 12px 18px;
  border-radius: 999px;
  background: #11141c;
  color: #fff;
  box-shadow: 0 12px 36px rgb(0 0 0 / 24%);
  text-align: center;
  transform: translateX(-50%);
}

@media (max-width: 768px) {
  .support-fab { width: auto; height: 46px; min-width: 0; min-height: 46px; padding: 0 16px 0 14px; gap: 8px; border-radius: 999px; bottom: max(4px, env(safe-area-inset-bottom)); }
  .support-fab::before { display: none; }
  .support-fab__icon { display: block; width: 20px; height: 20px; flex: 0 0 auto; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.8; }
  .support-fab__label { position: static; width: auto; height: auto; overflow: visible; clip: auto; white-space: nowrap; }
  .support-panel,
  .support-panel--left,
  .support-panel--sidebar,
  .support-panel--hero,
  .support-panel--right {
    right: 12px;
    bottom: 12px;
    left: 12px;
    width: calc(100vw - 24px);
    max-height: 40vh;
    border-radius: 22px;
  }
  .support-panel.support-panel--left,
  .support-panel.support-panel--sidebar,
  .support-panel.support-panel--hero,
  .support-panel.support-panel--right {
    top: auto;
    right: 12px;
    bottom: 12px;
    left: 12px;
    width: calc(100vw - 24px);
    max-height: 40vh;
    overflow: hidden;
  }
  .support-panel__body {
    max-height: calc(40vh - 54px);
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
  }
  .support-panel__header { padding: 7px 12px; }
  .support-panel__header h2 { font-size: .96rem; }
  .support-panel__close { width: 32px; height: 32px; font-size: 1.3rem; }
  .support-panel__body { padding: 6px 12px 8px; }
  .support-panel__conversation { grid-template-columns: 44px minmax(0,1fr); gap: 7px; }
  .support-panel__avatar { width: 44px; height: 44px; }
  .support-panel__greeting { padding: 8px 10px; }
  .support-panel__greeting p { font-size: .76rem; line-height: 1.4; }
  .support-panel__prompt { margin: 9px 0 5px; font-size: .69rem; }
  .support-panel__options { gap: 5px; }
  .support-panel__options button { min-height: 30px; padding: 4px 12px; font-size: .77rem; }
  .support-panel__reply { margin-top: 7px; padding: 7px 9px; font-size: .72rem; }
  .support-panel__composer { grid-template-columns: minmax(0,1fr) 32px 32px; gap: 4px; margin-top: 8px; padding: 4px; }
  .support-panel__composer input { padding: 0 5px; font-size: .77rem; }
  .support-panel__composer button { width: 32px; height: 32px; }
  .support-panel__emoji { font-size: 1.05rem; }
  .support-panel__send { font-size: .92rem; }
  .support-is-open .toast { bottom: 88px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}