:root {
  color-scheme: dark;
  --bg: #17231f;
  --panel: #22332f;
  --panel-2: #2d4039;
  --ink: #f6f0df;
  --muted: #b8c4b2;
  --accent: #ffd166;
  --accent-2: #78d6b5;
  --warn: #ff7a6f;
  --line: rgba(246, 240, 223, 0.16);
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
  font-family: "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  min-height: 100svh;
  background:
    radial-gradient(circle at 12% 12%, rgba(120, 214, 181, 0.18), transparent 28%),
    linear-gradient(155deg, #17231f 0%, #24362f 44%, #40372a 100%);
  color: var(--ink);
  touch-action: manipulation;
  user-select: none;
}

button {
  border: 0;
  color: inherit;
  font: inherit;
}

.app-shell {
  width: min(100%, 720px);
  min-height: 100svh;
  margin: 0 auto;
  padding: max(16px, env(safe-area-inset-top)) 16px max(16px, env(safe-area-inset-bottom));
  display: grid;
  grid-template-rows: auto auto 1fr auto auto auto;
  gap: 12px;
}

.topbar,
.status-strip,
.game-panel,
.controls,
.mode-row {
  width: 100%;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow,
.label,
.install-note,
#versionLabel {
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 2px 0 0;
  font-size: clamp(2.1rem, 12vw, 4.4rem);
  line-height: 0.92;
  letter-spacing: 0;
}

.score-stack {
  min-width: 76px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(34, 51, 47, 0.86);
  box-shadow: var(--shadow);
}

.score-stack span {
  display: block;
  font-size: 1.65rem;
  font-weight: 800;
}

.score-stack small {
  margin-top: -14px;
  color: var(--muted);
  font-size: 0.72rem;
}

.status-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.status-strip div {
  min-height: 58px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(34, 51, 47, 0.78);
}

.status-strip strong {
  display: block;
  margin-top: 2px;
  font-size: 1.25rem;
}

.game-panel {
  min-height: 0;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(34, 51, 47, 0.82);
  box-shadow: var(--shadow);
}

.board-wrap {
  min-height: 0;
  display: grid;
  place-items: center;
}

.board {
  --size: 5;
  --grid-size: 6;
  width: min(100%, 92svh, 640px);
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(var(--grid-size), 1fr);
  grid-template-rows: repeat(var(--grid-size), 1fr);
  gap: clamp(4px, 1.3vw, 8px);
}

.cell,
.target,
.corner {
  min-width: 0;
  min-height: 0;
  border-radius: 8px;
}

.cell {
  position: relative;
  display: grid;
  place-items: center;
  border: 1px solid rgba(246, 240, 223, 0.16);
  background: linear-gradient(145deg, #f6f0df, #d9d6bf);
  color: #16241f;
  box-shadow: inset 0 -5px 0 rgba(0, 0, 0, 0.12);
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease;
}

.cell:active {
  transform: scale(0.96);
}

.cell.is-on {
  background: linear-gradient(145deg, #ffd166, #ef9f55);
  border-color: rgba(255, 209, 102, 0.86);
  box-shadow: inset 0 -5px 0 rgba(89, 42, 12, 0.22), 0 0 0 3px rgba(255, 209, 102, 0.15);
}

.cell.is-hint {
  animation: pulse 780ms ease-in-out 3;
}

.cell-number {
  font-size: clamp(1.05rem, 7vw, 2.55rem);
  font-weight: 900;
  line-height: 1;
}

.target,
.corner {
  display: grid;
  place-items: center;
  padding: 2px;
  border: 1px solid var(--line);
  background: rgba(23, 35, 31, 0.86);
  color: var(--muted);
  font-weight: 800;
  font-size: clamp(0.72rem, 3.4vw, 1.15rem);
  line-height: 1;
}

.target.is-good {
  color: #17231f;
  background: var(--accent-2);
}

.target.is-over {
  color: #2d0e0b;
  background: var(--warn);
}

.target small {
  display: block;
  margin-top: 2px;
  font-size: 0.58em;
  opacity: 0.78;
}

.message-row {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

#message {
  margin: 0;
  font-size: clamp(0.9rem, 3.5vw, 1.05rem);
  line-height: 1.35;
}

#versionLabel {
  flex: 0 0 auto;
}

.controls,
.mode-row {
  display: grid;
  gap: 8px;
}

.controls {
  grid-template-columns: repeat(4, 1fr);
}

.mode-row {
  grid-template-columns: repeat(3, 1fr);
}

.controls button,
.mode-button {
  min-height: 50px;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  font-weight: 850;
  box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.16);
}

.controls button:active,
.mode-button:active {
  transform: translateY(1px);
}

.mode-button.is-active {
  background: var(--accent-2);
  color: #10231e;
}

.install-note {
  padding: 0 2px;
  text-align: center;
  line-height: 1.45;
  text-transform: none;
}

@keyframes pulse {
  50% {
    transform: scale(1.08);
    box-shadow: 0 0 0 6px rgba(120, 214, 181, 0.24);
  }
}

@media (min-width: 780px) {
  .app-shell {
    padding-inline: 24px;
  }
}

@media (max-height: 720px) {
  h1 {
    font-size: 2.05rem;
  }

  .install-note {
    display: none;
  }

  .status-strip div,
  .controls button,
  .mode-button {
    min-height: 44px;
  }
}