* {
  box-sizing: border-box;
}

:root {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 16% 12%, rgba(126, 96, 255, 0.24), transparent 30rem),
    radial-gradient(circle at 82% 80%, rgba(54, 226, 245, 0.18), transparent 28rem),
    #0f1220;
  color: #d9e1f4;
  font-family: Arial, sans-serif;
}

button {
  border: 0;
  border-radius: 12px;
  background: #4a8bff;
  color: #edf2ff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 12px 14px;
}

button:hover {
  background: #6ca2ff;
}

button.secondary {
  background: #2f3b64;
}

button.secondary:hover {
  background: #45568f;
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 690px) 280px;
  gap: 22px;
  justify-content: center;
  align-items: start;
  width: min(980px, 100%);
  margin: 0 auto;
  padding: 24px 18px 10px;
}

.game-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mobile-info-toggle {
  display: none;
}

.top-panel {
  display: grid;
  grid-template-columns: 1fr 1fr 1.4fr;
  gap: 10px;
}

.top-panel > div,
.status,
.board {
  border: 1px solid rgba(244, 247, 255, 0.22);
  border-radius: 18px;
  background: rgba(31, 42, 78, 0.88);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
}

.top-panel > div {
  min-height: 74px;
  padding: 12px;
}

.label {
  display: block;
  color: #aebcff;
  font-size: 13px;
  margin-bottom: 6px;
}

.top-panel strong {
  color: #ffffff;
  font-size: 28px;
}

.next-balls {
  display: flex;
  gap: 8px;
  min-height: 40px;
}

.board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 3px;
  width: 100%;
  max-width: 690px;
  aspect-ratio: 1;
  padding: 8px;
  touch-action: none;
}

.cell {
  position: relative;
  border: 1px solid rgba(244, 247, 255, 0.18);
  border-radius: 11px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.14), transparent 50%),
    #273454;
  cursor: pointer;
  display: grid;
  place-items: center;
  min-width: 0;
  padding: 0;
}

.cell.path {
  border-color: rgba(127, 176, 255, 0.75);
  box-shadow: inset 0 0 0 2px rgba(127, 176, 255, 0.2);
}

.ball,
.next-ball {
  border-radius: 50%;
  box-shadow:
    inset -10px -12px 14px rgba(0, 0, 0, 0.28),
    inset 7px 7px 9px rgba(255, 255, 255, 0.24),
    0 8px 16px rgba(0, 0, 0, 0.3);
}

.ball {
  width: 90%;
  height: 90%;
  transition:
    transform 140ms ease,
    box-shadow 140ms ease;
}

.cell.selected .ball {
  transform: translateY(-8%) scale(1.08);
  box-shadow:
    inset -10px -12px 14px rgba(0, 0, 0, 0.28),
    inset 7px 7px 9px rgba(255, 255, 255, 0.24),
    0 0 0 4px rgba(255, 212, 71, 0.26),
    0 14px 22px rgba(0, 0, 0, 0.36);
}

.cell.clearing .ball {
  animation: pop 280ms ease forwards;
}

.cell.new .ball {
  animation: grow 220ms ease forwards;
}

.cell.new.clearing .ball {
  animation: pop 280ms ease forwards;
}

.status {
  margin: 0;
  padding: 12px 14px;
  color: #c4ccee;
  line-height: 1.35;
}

.panel {
  border: 1px solid rgba(244, 247, 255, 0.14);
  border-radius: 18px;
  background: rgba(22, 29, 56, 0.9);
  padding: 18px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.24);
}

h1,
h2 {
  margin: 0 0 12px;
}

h1 {
  font-size: 28px;
  letter-spacing: -0.5px;
}

h2 {
  color: #edf2ff;
  font-size: 16px;
  margin-top: 18px;
}

.panel p {
  margin: 0 0 16px;
  color: #c4ccee;
  line-height: 1.45;
}

.next-ball {
  width: 38px;
  height: 38px;
}

.controls ul {
  margin: 8px 0 0;
  padding-left: 18px;
  color: #c4ccee;
  font-size: 14px;
  line-height: 1.45;
}

.controls li {
  margin-bottom: 5px;
}

.mobile-stats {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 10px;
}

.mobile-stats > div {
  border: 1px solid rgba(244, 247, 255, 0.12);
  border-radius: 14px;
  background: rgba(10, 14, 28, 0.45);
  padding: 10px;
}

.mobile-info-panel {
  display: none;
}

.mobile-restart {
  display: none;
}

.app-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  color: #7f8bb7;
  font-size: 13px;
}

.app-footer {
  grid-column: 2;
  padding-bottom: 8px;
}

.footer-sep {
  opacity: 0.45;
  user-select: none;
}

.footer-game {
  color: #b4c0e0;
  font-weight: 600;
}

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.56);
  padding: 18px;
}

.overlay-content {
  width: min(92vw, 390px);
  border: 1px solid rgba(244, 247, 255, 0.16);
  border-radius: 18px;
  background: #1b2442;
  padding: 22px;
  text-align: center;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
}

.overlay-content p {
  color: #c4ccee;
  line-height: 1.45;
}

.overlay-actions {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.overlay-name-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 12px;
  text-align: left;
}

.overlay-name-wrap label {
  color: #c7d1ee;
  font-size: 14px;
}

.overlay-name-wrap input {
  border: 1px solid #45568f;
  border-radius: 10px;
  background: #10162b;
  color: #d9e1f4;
  font-size: 16px;
  outline: none;
  padding: 11px 12px;
}

.overlay-name-wrap input:focus {
  border-color: #6ca2ff;
}

.hidden {
  display: none;
}

@keyframes pop {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1.4);
  }
}

@keyframes grow {
  0% {
    opacity: 0;
    transform: scale(0.35);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 880px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 10px 12px 8px;
  }

  .top-panel {
    grid-template-columns: 1fr 1fr;
  }

  .top-panel > div:last-child {
    grid-column: 1 / -1;
  }

  .board {
    gap: 2px;
    padding: 5px;
  }

  .side-area {
    display: none;
  }

  .mobile-info-toggle {
    display: block;
    max-width: 690px;
    width: 100%;
    align-self: center;
  }

  .mobile-info-panel {
    display: grid;
    gap: 12px;
    border: 1px solid rgba(244, 247, 255, 0.14);
    border-radius: 18px;
    background: rgba(22, 29, 56, 0.92);
    padding: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.24);
  }

  .mobile-info-panel.hidden {
    display: none;
  }

  .mobile-info-panel .controls h2 {
    margin-top: 0;
  }

  .mobile-info-panel button {
    width: 100%;
  }

  .mobile-restart {
    display: block;
    max-width: 690px;
    width: 100%;
    align-self: center;
  }

  .app-footer {
    grid-column: 1;
  }
}