.battle-icon {
  color: #185ac5;
  letter-spacing: .18em;
}

.battle-quick-panel { max-width: 820px; margin-inline: auto; }

.battle-quick-intro {
  max-width: 620px;
  margin: 16px auto 20px;
  text-align: center;
}

.battle-quick-intro h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
.battle-quick-intro > p:last-child { margin: 0; color: #526a84; font-size: 1.08rem; }

.battle-quick-start {
  max-width: 620px;
  margin: 0 auto;
  padding: clamp(18px, 4vw, 30px);
  border: 2px solid #d7e2ef;
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 14px 34px #17385c12;
}

.battle-opponent-field { display: grid; gap: 8px; }
.battle-field-label,
.battle-quick-grid label { font-weight: 900; }

.battle-opponent-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 5px;
  border-radius: 14px;
  background: #edf3fa;
}

.battle-opponent-toggle button {
  min-height: 48px;
  border: 2px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: #314b68;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.battle-opponent-toggle button.selected {
  border-color: #10151c;
  background: #10151c;
  color: #fff;
  box-shadow: 0 4px 12px #10151c25;
}

.battle-quick-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 18px;
}

.battle-quick-grid label { display: grid; align-content: start; gap: 7px; }

.battle-ready-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 18px;
  padding: 12px 14px;
  border: 1px solid #bfd5ef;
  border-radius: 13px;
  background: #eff6ff;
  color: #174c96;
  font-weight: 850;
}

.battle-ready-row .secondary { flex: 0 0 auto; padding: 10px 14px; }
.battle-start-button { width: 100%; min-height: 52px; }

.battle-letter-input {
  text-align: center;
  text-transform: uppercase;
  font-size: 1.35rem;
  font-weight: 1000;
}

.battle-setup-message {
  min-height: 1.3em;
  margin: 8px 0;
  color: #b3263f;
  font-weight: 850;
}

.battle-layout {
  display: grid;
  grid-template-columns: minmax(330px, 500px) minmax(280px, 1fr);
  align-items: start;
  gap: 24px;
  margin-top: 16px;
}

.battle-board-wrap {
  display: grid;
  place-items: center;
  padding: 18px;
  border: 2px solid #d3dfed;
  border-radius: 20px;
  background: #f4f8fd;
}

.battle-board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  gap: 4px;
  width: min(100%, 480px);
  aspect-ratio: 1;
  padding: 8px;
  background: #d9e6f3;
  border-radius: 12px;
  isolation: isolate;
}

.battle-board::before,
.battle-board::after {
  content: "";
  position: absolute;
  z-index: 0;
  background: #12243a;
  pointer-events: none;
}

.battle-board::before {
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  transform: translateX(-1.5px);
}

.battle-board::after {
  left: 0;
  right: 0;
  top: 50%;
  height: 3px;
  transform: translateY(-1.5px);
}

.battle-axis-marker {
  position: absolute;
  z-index: 3;
  color: #12243a;
  font-size: .82rem;
  font-weight: 1000;
  font-style: italic;
  pointer-events: none;
}

.battle-axis-marker::before,
.battle-axis-marker::after {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
}

.axis-x {
  left: -10px;
  right: -18px;
  top: calc(50% - 18px);
  height: 36px;
  text-align: right;
}

.axis-x::before {
  left: 0;
  top: 11px;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-right: 10px solid #12243a;
}

.axis-x::after {
  right: 0;
  top: 11px;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-left: 10px solid #12243a;
}

.axis-y {
  left: calc(50% + 8px);
  top: -19px;
  bottom: -10px;
  width: 20px;
}

.axis-y::before {
  left: -13px;
  top: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-bottom: 10px solid #12243a;
}

.axis-y::after {
  left: -13px;
  bottom: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-top: 10px solid #12243a;
}

.battle-origin {
  position: absolute;
  z-index: 4;
  left: 50%;
  top: 50%;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #12243a;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.battle-cell {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  min-width: 0;
  border: 2px solid #7595b8;
  border-radius: 7px;
  background: #fff;
}

.battle-piece {
  display: grid;
  place-items: center;
  width: 76%;
  height: 76%;
  border-radius: 7px;
  background: #10151c;
  color: #fff;
  font-size: clamp(1rem, 3vw, 1.55rem);
  font-weight: 1000;
  box-shadow: 0 4px 9px #0004;
}

.battle-piece.active {
  outline: 4px solid #f0b429;
  outline-offset: 2px;
}

.battle-piece.player-k {
  background: #080d13;
  color: #8fc1ff;
}

.battle-controls {
  padding: 18px;
  border-radius: 18px;
  background: #f3f7fc;
}

.battle-type-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
}

.battle-type-tabs button,
.battle-choice-row button {
  border: 2px solid #bad0e7;
  border-radius: 10px;
  background: #fff;
  color: #173f88;
  font-weight: 900;
  cursor: pointer;
}

.battle-type-tabs button {
  padding: 13px 7px;
}

.battle-type-tabs button.selected {
  border-color: #10151c;
  background: #10151c;
  color: #fff;
}

.battle-move-options {
  display: grid;
  gap: 10px;
  margin: 16px 0;
}

.battle-choice-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}

.battle-choice-row button {
  min-width: 66px;
  padding: 10px 13px;
}

.battle-choice-row button.selected {
  border-color: #185ac5;
  background: #185ac5;
  color: #fff;
}

.battle-preview {
  min-height: 54px;
  margin: 12px 0;
  padding: 12px;
  border-radius: 11px;
  background: #e8f1fc;
  color: #173f88;
  font-weight: 800;
  line-height: 1.45;
}

.battle-controls .primary {
  width: 100%;
}

.battle-result {
  grid-column: 1 / -1;
}

.battle-result[hidden] {
  display: none;
}

.battle-celebration {
  position: fixed;
  inset: 0;
  z-index: 100;
  overflow: hidden;
  pointer-events: none;
}

.battle-firework {
  position: absolute;
  left: var(--burst-x);
  top: var(--burst-y);
  width: 1px;
  height: 1px;
}

.battle-firework i {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--spark-color);
  box-shadow: 0 0 12px var(--spark-color);
  animation: battle-firework-spark 1.35s ease-out forwards;
}

@keyframes battle-firework-spark {
  0% { opacity: 1; transform: translate(0, 0) scale(.45); }
  75% { opacity: 1; }
  100% { opacity: 0; transform: translate(var(--spark-x), var(--spark-y)) scale(1); }
}

@media (max-width: 900px) {
  .battle-layout { grid-template-columns: 1fr; }
  .battle-board { width: min(100%, 450px); }
  .battle-result { grid-column: auto; }
}

@media (max-width: 560px) {
  .battle-board-wrap { padding: 9px; }
  .battle-board { gap: 3px; padding: 6px; }
  .battle-cell { border-width: 1px; border-radius: 4px; }
  .battle-piece { border-radius: 4px; }
  .battle-type-tabs { grid-template-columns: 1fr; }
  .battle-quick-grid { grid-template-columns: 1fr; }
  .battle-ready-row { align-items: stretch; flex-direction: column; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  .battle-firework i { animation-duration: .01ms; }
}