html, body { margin: 0; height: 100%; background: #07070d; overflow: hidden; }
body { display: flex; align-items: center; justify-content: center; }
canvas { display: block; }
/* Прозрачная кнопка поверх надписи «Група» на canvas. */
#groupBtn {
  position: fixed; z-index: 1; padding: 0; border: 0; border-radius: 8px;
  background: transparent; color: transparent; cursor: pointer;
}
#groupBtn[hidden], #menu[hidden], #hint[hidden], #install[hidden], #installYes[hidden] { display: none; }
#groupBtn:focus-visible { outline: 2px solid #ff3fb4; outline-offset: 2px; }

/* Выбор группы в стиле скина: неоновые трубки. */
#menu {
  position: fixed; inset: 0; z-index: 2; display: flex; align-items: center; justify-content: center;
  background: rgba(7, 7, 13, .78);
  font-family: "Segoe UI", Roboto, "Helvetica Neue", system-ui, sans-serif;
}
#menuPanel {
  padding: 18px 20px 20px; max-width: calc(100vw - 32px); box-sizing: border-box;
  background: #07070d; border: 2px solid #ff3fb4; border-radius: 16px;
  box-shadow: 0 0 22px #ff3fb4, inset 0 0 14px rgba(255, 63, 180, .35);
}
#menuTitle {
  margin: 0 0 14px; text-align: center; font-size: 16px; font-weight: 500;
  color: #ff7ccb; text-shadow: 0 0 10px #ff3fb4;
}
#menuGrid { display: grid; grid-template-columns: repeat(4, minmax(52px, 1fr)); gap: 10px; }
#menuGrid button {
  min-height: 44px; padding: 0 8px; font: 600 17px inherit; font-family: inherit; cursor: pointer;
  color: #25e6ff; background: rgba(37, 230, 255, .06);
  border: 1.5px solid #25e6ff; border-radius: 10px;
  box-shadow: 0 0 8px rgba(37, 230, 255, .75), inset 0 0 6px rgba(37, 230, 255, .25);
  text-shadow: 0 0 8px #25e6ff;
}
#menuGrid button:hover { background: rgba(37, 230, 255, .18); }
#menuGrid button:focus-visible { outline: 2px solid #f4f1e8; outline-offset: 2px; }
#menuGrid button[aria-current="true"] {
  color: #fff; background: rgba(255, 63, 180, .28); border-color: #ff3fb4;
  box-shadow: 0 0 14px #ff3fb4, inset 0 0 8px rgba(255, 63, 180, .5);
  text-shadow: 0 0 8px #ff3fb4;
}
@media (max-width: 340px) { #menuGrid { grid-template-columns: repeat(3, minmax(52px, 1fr)); } }

/* Подсказка при первом входе: неоновая рамка, пока группа не выбрана. */
#hint {
  position: fixed; z-index: 1; width: 176px; height: 42px; padding: 0; box-sizing: border-box; cursor: pointer;
  color: #fff; font: 600 15px "Segoe UI", Roboto, "Helvetica Neue", system-ui, sans-serif;
  background: rgba(7, 7, 13, .92); border: 1.5px solid #ff3fb4; border-radius: 12px;
  text-shadow: 0 0 8px #ff3fb4;
  animation: hint-pulse 1.6s ease-in-out infinite, hint-float 3.2s ease-in-out infinite;
}
#hint::after {   /* уголок к надписи */
  content: ""; position: absolute; left: 50%; bottom: -6px; width: 10px; height: 10px; margin-left: -5px;
  background: #07070d; border-right: 1.5px solid #ff3fb4; border-bottom: 1.5px solid #ff3fb4; transform: rotate(45deg);
}
#hint:focus-visible { outline: 2px solid #f4f1e8; outline-offset: 3px; }
@keyframes hint-pulse {
  0%, 100% { box-shadow: 0 0 5px #ff3fb4, 0 0 12px rgba(255, 63, 180, .55), inset 0 0 5px rgba(255, 63, 180, .3); }
  50% { box-shadow: 0 0 10px #ff3fb4, 0 0 28px #ff3fb4, inset 0 0 10px rgba(255, 63, 180, .55); }
}
@keyframes hint-float { 0%, 100% { translate: 0 0; } 50% { translate: 0 -4px; } }
@media (prefers-reduced-motion: reduce) {
  #hint { animation: none; box-shadow: 0 0 10px #ff3fb4; }
}

/* Предложение поставить ярлык на телефоне. */
#install {
  position: fixed; left: 12px; right: 12px; bottom: max(12px, env(safe-area-inset-bottom)); z-index: 1;
  max-width: 420px; margin: 0 auto; padding: 14px 16px; box-sizing: border-box;
  background: #07070d; border: 2px solid #25e6ff; border-radius: 14px;
  box-shadow: 0 0 18px rgba(37, 230, 255, .8), inset 0 0 10px rgba(37, 230, 255, .25);
  font-family: "Segoe UI", Roboto, "Helvetica Neue", system-ui, sans-serif;
}
#installText { margin: 0 0 12px; color: #f4f1e8; font-size: 15px; line-height: 1.35; }
#installActions { display: flex; gap: 10px; justify-content: flex-end; }
#installActions button {
  min-height: 40px; padding: 0 14px; font: inherit; font-size: 15px; font-weight: 600; cursor: pointer;
  border-radius: 10px; color: #25e6ff; background: transparent; border: 1.5px solid #3a3d50;
}
#installYes { color: #fff !important; background: rgba(255, 63, 180, .28) !important; border-color: #ff3fb4 !important; box-shadow: 0 0 10px #ff3fb4; }
#installActions button:focus-visible { outline: 2px solid #f4f1e8; outline-offset: 2px; }