:root {
  --cell: #c0c0c0;
  --cell-lit: #d8d8d8;
  --cell-open: #bdbdbd;
  --border-3d-light: #ffffff;
  --border-3d-dark: #808080;
  --mine-bg: #c62828;
  --flag: #c62828;
  --num1: #0000dd;
  --num2: #017b01;
  --num3: #dd0000;
  --num4: #000080;
  --num5: #800000;
  --num6: #008080;
  --num7: #000;
  --num8: #808080;
}

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

html,
body {
  height: 100%;
  margin: 0;
}

body {
  font-family: "Nunito", system-ui, sans-serif;
  color: #333;
  line-height: 1.45;
}

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(145deg, #e8eaf6 0%, #c5cae9 40%, #9fa8da 100%);
}

.app {
  min-height: 100%;
  max-width: 100%;
  padding: clamp(0.65rem, 1.2vw, 1rem) clamp(0.65rem, 1.2vw, 1rem) clamp(0.65rem, 1.2vw, 1rem)
    clamp(1rem, 2.4vw, 2rem);
  display: flex;
  flex-direction: column;
}

.layout-main {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  gap: clamp(0.45rem, 1vw, 1rem);
  flex: 1;
  min-height: min(calc(100vh - 2rem), 1100px);
}

.layout-sidebar {
  flex: 0 0 clamp(300px, 33vw, 440px);
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  min-height: 0;
  overflow-y: auto;
  padding-left: clamp(0.25rem, 0.8vw, 0.65rem);
  padding-right: clamp(0.15rem, 0.5vw, 0.35rem);
}

.layout-game {
  flex: 1;
  min-width: 0;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem;
}

.header h1 {
  margin: 0;
  font-family: "Fredoka", system-ui, sans-serif;
  font-size: clamp(2rem, 4vw, 2.85rem);
  font-weight: 700;
  color: #283593;
  text-shadow: 1px 1px 0 #fff;
}

.hint--rules {
  font-size: clamp(0.82rem, 1.15vw, 0.95rem);
  font-weight: 600;
  margin: 0;
  padding: 0.65rem 0.75rem;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 14px;
  border: 3px dashed #5c6bc0;
  line-height: 1.55;
}

.panel {
  background: rgba(255, 255, 255, 0.96);
  border: 4px solid #5c6bc0;
  border-radius: 18px;
  padding: 0.9rem 1rem;
  box-shadow: 0 6px 0 rgba(92, 107, 192, 0.2), 0 10px 28px rgba(0, 0, 0, 0.06);
}

.panel--controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.field span {
  font-size: 0.95rem;
  font-weight: 700;
  color: #3949ab;
}

select {
  padding: 0.65rem 0.85rem;
  border-radius: 14px;
  border: 3px solid #5c6bc0;
  background: #fff;
  font-size: 1.05rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
}

.btn {
  padding: 0.75rem 1.15rem;
  border-radius: 16px;
  border: 4px solid #3949ab;
  background: #fff;
  font-family: "Fredoka", sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  box-shadow: 0 4px 0 #3949ab;
}

.btn--start-wide {
  width: 100%;
  padding: 1rem 1.35rem;
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 #3949ab;
}

.btn:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 #3949ab;
}

.btn--primary {
  background: linear-gradient(180deg, #7986cb, #5c6bc0);
  border-color: #3949ab;
  color: #fff;
  box-shadow: 0 4px 0 #303f9f;
}

.btn--primary:hover {
  box-shadow: 0 6px 0 #303f9f;
}

.side-stats {
  padding: 0.75rem 0.65rem;
}

.stats--compact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}

.stat-bubble {
  font-weight: 700;
  font-size: 0.85rem;
  line-height: 1.3;
  padding: 0.55rem 0.45rem;
  background: linear-gradient(180deg, #e8eaf6, #c5cae9);
  border: 3px solid #5c6bc0;
  border-radius: 14px;
  text-align: center;
}

.stat-bubble strong {
  display: inline-block;
  margin-top: 0.2rem;
  color: #1a237e;
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 800;
}

.game-stage {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: min(90vh, 1080px);
  padding: 0.5rem;
}

.board-outer {
  width: 100%;
  max-width: min(92vw, 720px);
}

.message {
  min-height: 1.6rem;
  margin: 0 0 0.65rem;
  text-align: center;
  font-weight: 700;
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: #283593;
}

.message--win {
  color: #2e7d32;
}

.message--lose {
  color: #c62828;
}

.board {
  display: inline-grid;
  gap: 0;
  padding: 6px;
  background: #9e9e9e;
  border: 4px solid;
  border-color: var(--border-3d-light) var(--border-3d-dark) var(--border-3d-dark) var(--border-3d-light);
  border-radius: 4px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  user-select: none;
  -webkit-user-select: none;
}

.board .cell[aria-disabled="true"] {
  opacity: 1;
  cursor: default;
}

.cell {
  width: clamp(28px, 7.5vw, 40px);
  height: clamp(28px, 7.5vw, 40px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Fredoka", sans-serif;
  font-weight: 700;
  font-size: clamp(0.95rem, 4vw, 1.25rem);
  cursor: pointer;
  border: 2px solid;
  border-color: var(--border-3d-light) var(--border-3d-dark) var(--border-3d-dark) var(--border-3d-light);
  background: var(--cell);
  line-height: 1;
}

.cell:hover:not(.cell--open):not(.cell--flagged):not([aria-disabled="true"]) {
  background: var(--cell-lit);
}

.cell--open {
  border: 1px solid #9e9e9e;
  border-color: #9e9e9e;
  background: var(--cell-open);
  cursor: default;
}

.cell--mine {
  background: var(--mine-bg);
  color: #fff;
}

.cell--flagged {
  background: var(--cell);
}

.cell--bad-flag {
  background: #ffcdd2;
}

.cell--n1 {
  color: var(--num1);
}
.cell--n2 {
  color: var(--num2);
}
.cell--n3 {
  color: var(--num3);
}
.cell--n4 {
  color: var(--num4);
}
.cell--n5 {
  color: var(--num5);
}
.cell--n6 {
  color: var(--num6);
}
.cell--n7 {
  color: var(--num7);
}
.cell--n8 {
  color: var(--num8);
}

.cell__flag {
  font-size: 1.1em;
  color: var(--flag);
}

.cell__mine {
  font-size: 1.05em;
}

@media (max-width: 900px) {
  .layout-main {
    flex-direction: column;
    min-height: auto;
  }

  .layout-sidebar {
    flex: none;
    max-width: none;
    width: 100%;
    order: 2;
  }

  .layout-game {
    order: 1;
  }

  .header {
    text-align: center;
  }
}