:root {
  --color-primary: #1565c0;
  --color-primary-dark: #0d47a1;
  --color-primary-light: #e3f0ff;
  --color-primary-mid: #90caf9;
  --color-bg: #f0f4f8;
  --color-text: #1a2a3a;
  --color-text-muted: #455a64;

  --ship-carrier: #1565c0;
  --ship-battleship: #0288d1;
  --ship-cruiser: #00838f;
  --ship-submarine: #558b2f;
  --ship-destroyer: #f57f17;

  --cell-size: 38px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 16px 48px;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: 920px;
}

header {
  display: flex;
  align-items: center;
  gap: 16px;
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}

#loading-indicator {
  font-size: 0.85rem;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-mid);
  border-radius: 20px;
  padding: 4px 14px;
}

#controls {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

#mode-toggle {
  display: flex;
  background: #dce8f8;
  border-radius: 8px;
  padding: 3px;
  gap: 3px;
}

.toggle-btn {
  padding: 8px 20px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--color-primary);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition:
    background 0.15s,
    color 0.15s;
}

.toggle-btn.active {
  background: var(--color-primary);
  color: #fff;
}

.toggle-btn:not(.active):hover {
  background: #b3d0f5;
}

#action-btns {
  display: flex;
  gap: 10px;
}

button {
  padding: 9px 22px;
  border: none;
  border-radius: 7px;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    background 0.15s,
    opacity 0.15s;
}

button:disabled {
  background: #b0bec5;
  cursor: not-allowed;
}

button:hover:not(:disabled) {
  background: var(--color-primary-dark);
}

button.secondary {
  background: #fff;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

button.secondary:hover:not(:disabled) {
  background: var(--color-primary-light);
}

#game-status {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-mid);
  border-radius: 8px;
  padding: 8px 24px;
  min-width: 280px;
  text-align: center;
}

#end-banner {
  background: var(--color-primary);
  color: #fff;
  border-radius: 10px;
  padding: 12px 36px;
  font-size: 1.2rem;
  font-weight: 700;
  text-align: center;
}

#placement-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
}

#placement-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

#ship-list {
  list-style: none;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

#ship-list li {
  padding: 5px 13px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 5px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: grab;
  user-select: none;
  transition: opacity 0.15s;
}

#ship-list li[data-ship="carrier"] {
  background: var(--ship-carrier);
}
#ship-list li[data-ship="battleship"] {
  background: var(--ship-battleship);
}
#ship-list li[data-ship="cruiser"] {
  background: var(--ship-cruiser);
}
#ship-list li[data-ship="submarine"] {
  background: var(--ship-submarine);
}
#ship-list li[data-ship="destroyer"] {
  background: var(--ship-destroyer);
}

#ship-list li:hover {
  opacity: 0.85;
}

#ship-list li.dragging {
  opacity: 0.5;
  outline: 2px dashed var(--color-primary);
  cursor: grabbing;
}

#ship-list li.placed {
  background: #cfd8dc;
  color: #78909c;
  cursor: default;
  text-decoration: line-through;
}

#boards {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  justify-content: center;
}

.board-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.board-wrap h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.board {
  display: grid;
  grid-template-columns: repeat(10, var(--cell-size));
  grid-template-rows: repeat(10, var(--cell-size));
  gap: 2px;
  border: 2px solid var(--color-primary-mid);
  border-radius: 6px;
  padding: 4px;
  background: var(--color-primary-light);
}

.board.placeholder {
  opacity: 0.45;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  background: #fff;
  border: 1px solid #bbdefb;
  border-radius: 3px;
  transition: background 0.1s;
}

.cell.ship-carrier {
  background: var(--ship-carrier);
}
.cell.ship-battleship {
  background: var(--ship-battleship);
}
.cell.ship-cruiser {
  background: var(--ship-cruiser);
}
.cell.ship-submarine {
  background: var(--ship-submarine);
}
.cell.ship-destroyer {
  background: var(--ship-destroyer);
}
.cell.ship {
  background: var(--color-primary);
}

.cell.hit {
  background: #e53935;
  border-color: #b71c1c;
}
.cell.miss {
  background: #eceff1;
  border-color: #b0bec5;
  position: relative;
}
.cell.miss::after {
  content: "•";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #90a4ae;
  font-size: 1.1rem;
}

.cell.preview-valid {
  background: #a5d6a7;
  border-color: #388e3c;
}
.cell.preview-invalid {
  background: #ef9a9a;
  border-color: #c62828;
}

#board-enemy .cell.clickable {
  cursor: crosshair;
  background: var(--color-primary-light);
}
#board-enemy .cell.clickable:hover {
  background: var(--color-primary-mid);
}

.hidden {
  display: none !important;
}

#placement-area-aivai {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
}

.placement-side {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.placement-side-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.ship-list-side {
  list-style: none;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.ship-list-side li {
  padding: 5px 13px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 5px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: grab;
  user-select: none;
  transition: opacity 0.15s;
}

.ship-list-side li[data-ship="carrier"] {
  background: var(--ship-carrier);
}
.ship-list-side li[data-ship="battleship"] {
  background: var(--ship-battleship);
}
.ship-list-side li[data-ship="cruiser"] {
  background: var(--ship-cruiser);
}
.ship-list-side li[data-ship="submarine"] {
  background: var(--ship-submarine);
}
.ship-list-side li[data-ship="destroyer"] {
  background: var(--ship-destroyer);
}

.ship-list-side li:hover {
  opacity: 0.85;
}

.ship-list-side li.dragging {
  opacity: 0.5;
  outline: 2px dashed var(--color-primary);
  cursor: grabbing;
}

.ship-list-side li.placed {
  background: #cfd8dc;
  color: #78909c;
  cursor: default;
  text-decoration: line-through;
}