:root {
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: #222;
  background: #f7f7fb;
}

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.app {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: minmax(280px, 420px) 260px;
  background: #fff;
  padding: 2rem;
  border-radius: 24px;
  box-shadow: 0 25px 45px rgba(15, 29, 54, 0.1);
}

.app.sidebar-hidden {
  grid-template-columns: minmax(280px, 420px);
}

.sidebar.hidden {
  display: none;
}

.board h1 {
  margin: 0 0 0.5rem;
  font-size: 1.8rem;
}

.hint {
  margin: 0 0 1rem;
  color: #666;
}

.grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
  background: #e6ecff;
  padding: 6px;
  border-radius: 18px;
  border: 2px solid #ced9ff;
}

.cell {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: #fff;
  position: relative;
  transition: transform 120ms ease, background 120ms ease, box-shadow 120ms ease,
    border-color 120ms ease;
}

.cell.path {
  background: #fff9e6;
  box-shadow: inset 0 0 0 2px rgba(255, 196, 69, 0.7);
}

.grid.hide-path .cell.path:not(.path-next):not(.path-done) {
  background: #fff;
  box-shadow: none;
  border: none;
}

.cell.path-next {
  background: #ffe08a;
  box-shadow: inset 0 0 0 3px #ff9800, 0 0 10px rgba(255, 152, 0, 0.9);
}

.cell.path-done {
  background: #e3f8e8;
  box-shadow: inset 0 0 0 2px rgba(45, 134, 89, 0.7);
}

.cell.obstacle {
  background: #2f3b66;
  box-shadow: inset 0 0 0 3px #000, 0 0 8px rgba(0, 0, 0, 0.5);
}

.cell.obstacle::after {
  content: "🚧";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
}

.cell.home {
  background: linear-gradient(135deg, #ffd361, #ffb347);
  border: 2px dashed #d48a00;
}

.cell.cat {
  background: #6c8dff;
  box-shadow: 0 8px 16px rgba(108, 141, 255, 0.35);
  transform: scale(1.05);
}

.cell.cat::after {
  content: "🐱";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2.5rem;
  transform-origin: center;
  transition: transform 160ms ease;
}

.cell.cat.cat-dir-up::after {
  transform: translate(-50%, -50%) rotate(180deg);
}

.cell.cat.cat-dir-right::after {
  transform: translate(-50%, -50%) rotate(-90deg);
}

.cell.cat.cat-dir-down::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.cell.cat.cat-dir-left::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.cell.cat::before {
  display: none;
}

.cell.cat-next-up::before {
  display: none;
}

.cell.cat-next-down::before {
  display: none;
}

.cell.cat-next-left::before {
  display: none;
}

.cell.cat-next-right::before {
  display: none;
}

.cell.home::after {
  content: "🏠";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
}

.controls {
  margin: 1.2rem 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}

.controls .row {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
}

.ctrl-btn {
  width: 52px;
  height: 52px;
  border-radius: 8px;
  border: 3px solid #000;
  background: #fff;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.ctrl-inner {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 3px solid #000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.ctrl-btn:hover .ctrl-inner {
  background: #000;
  color: #fff;
}

.ctrl-btn:active {
  transform: translateY(1px);
  box-shadow: 0 0 0;
}

.controller-shell {
  position: relative;
  margin: 1.2rem auto 0.8rem;
  padding: 1.4rem 3.4rem;
  border-radius: 70px;
  border: 3px solid #111;
  background: #ffffff;
  box-shadow: 0 14px 24px rgba(0, 0, 0, 0.15);
  max-width: 380px;
  width: 100%;
}

.controller-shell::before,
.controller-shell::after {
  content: "";
  position: absolute;
  top: -20px;
  width: 60px;
  height: 30px;
  border-radius: 30px 30px 0 0;
  border: 3px solid #111;
  border-bottom: none;
  background: #ffffff;
}

.controller-shell::before {
  left: 46px;
}

.controller-shell::after {
  right: 46px;
}

.status {
  margin: 0.5rem 0;
  min-height: 1.4em;
  font-weight: 600;
  color: #415086;
}

.status.error {
  color: #d64045;
}

.status.success {
  color: #2d8659;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 0.4rem 0 0.6rem;
}

.option-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: #414867;
  cursor: pointer;
  width: 100%;
}

.option-toggle input[type="checkbox"] {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 2px solid #6c8dff;
  accent-color: #6c8dff;
  cursor: pointer;
}

.reset {
  border: none;
  background: #ffd361;
  color: #4c3b08;
  padding: 0.6rem 1rem;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease;
}

.reset:hover {
  background: #ffc445;
  transform: translateY(-2px);
}

.sidebar {
  background: #f4f6ff;
  border-radius: 18px;
  padding: 1.25rem;
  border: 1px solid #dce3ff;
}

.sidebar h2 {
  margin: 0 0 1rem;
}

.instructions {
  list-style: decimal;
  padding-left: 1.3rem;
  margin: 0 0 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.instructions li {
  padding: 0.35rem 0.5rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.instr-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  min-width: 2.1rem;
  min-height: 2.1rem;
  border-radius: 12px;
  background: #6c8dff;
  color: #ffffff;
  font-size: 1.5rem;
  box-shadow: 0 4px 10px rgba(108, 141, 255, 0.4);
}

.instr-text {
  font-size: 0.9rem;
}

.instructions li.current {
  background: #dbe4ff;
  font-weight: 600;
  border: 1px solid #9eb4ff;
}

.instructions li.done {
  opacity: 0.6;
  text-decoration: line-through;
}

.tip {
  margin: 0;
  color: #5a6180;
  font-size: 0.9rem;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(4, 11, 30, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease;
}

.overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: #ffffff;
  border-radius: 20px;
  padding: 1.8rem 2.1rem 1.6rem;
  max-width: 340px;
  width: 90%;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  position: relative;
  text-align: center;
}

.modal-emoji {
  font-size: 2.3rem;
  margin-bottom: 0.5rem;
}

.modal h2 {
  margin: 0 0 0.5rem;
}

.modal-text {
  margin: 0 0 1.2rem;
  color: #4f5670;
}

.modal-button {
  border: none;
  background: #6c8dff;
  color: #fff;
  padding: 0.6rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.95rem;
}

.modal-button:hover {
  background: #5a74d9;
}

.modal-close {
  position: absolute;
  top: 0.4rem;
  right: 0.6rem;
  border: none;
  background: transparent;
  font-size: 1.4rem;
  cursor: pointer;
  color: #777;
}

.modal-close:hover {
  color: #333;
}

@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
  }

  .grid {
    grid-template-columns: repeat(6, 1fr);
  }
}