/* ============================================================
   라이트 아웃 전용 스타일
   - 격자가 곧 게임이다: 정사각 셀을 CSS grid로 깔고, 셀 크기는 격자
     수(--n)에 맞춰 board 폭을 나눠 자동으로 맞춘다.
   - 판은 "불 켜진 패널" 느낌을 위해 라이트/다크 상관없이 어두운 판으로
     둔다(도구 자율). 켜진 칸은 따뜻한 램프색으로 은은히 빛나고, 꺼진 칸은
     차분히 가라앉는다. 힌트 칸만 주묵색 테두리로 신호를 준다.
   ============================================================ */

:root {
  --lo-panel: #1c1a24;       /* 판 배경(어두운 패널) */
  --lo-panel-edge: #2a2733;
  --lo-off: #2b2836;         /* 꺼진 칸 */
  --lo-off-edge: #3a3648;
  --lo-on: #f4b740;          /* 켜진 칸(램프색) */
  --lo-on-2: #ffcf6b;
  --lo-on-edge: #ffdf99;
  --lo-hint: #c23b30;        /* 힌트 테두리(주묵색) */
}

/* ---- 도입부 ---- */
.tool-intro { padding: clamp(30px, 5vw, 56px) 0 clamp(18px, 3vw, 30px); }
.tool-intro h1 { margin: 0 0 var(--space-4); }
.tool-intro .lead {
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--color-text-sub);
  max-width: 54ch;
  margin: 0;
}
.tool-intro .lead strong { color: var(--color-text); }
.tool-intro .lead-note {
  margin: var(--space-3) 0 0;
  font-size: .88rem;
  color: var(--color-text-sub);
}

/* ---- 설정 ---- */
.lo-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-4);
}
.lo-field {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.lo-lab {
  font-size: .95rem;
  font-weight: 700;
  color: var(--color-text-sub);
  min-width: 68px;
}
.lo-chips { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.lo-chip {
  font: inherit;
  font-size: 1rem;
  cursor: pointer;
  touch-action: manipulation;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}
.lo-chip:hover:not(:disabled) { border-color: var(--color-primary); }
.lo-chip[aria-pressed="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  font-weight: 700;
}
.lo-actions { margin-left: auto; }
.lo-btn {
  font: inherit;
  font-size: .98rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}
.lo-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.lo-btn:active { transform: scale(.97); }

/* ---- 상태 줄 ---- */
.lo-stage { max-width: 520px; margin: 0 auto; }
.lo-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.lo-stat {
  font-size: 1rem;
  color: var(--color-text-sub);
  font-variant-numeric: tabular-nums;
}
.lo-stat-r { text-align: right; }
.lo-stat b { font-size: 1.35rem; color: var(--color-text); }

/* ---- 게임판 ---- */
.lo-board-wrap {
  position: relative;
  display: grid;
}
.lo-board {
  --n: 5;
  display: grid;
  grid-template-columns: repeat(var(--n), 1fr);
  gap: clamp(6px, 1.8vw, 12px);
  width: 100%;
  aspect-ratio: 1 / 1;
  padding: clamp(10px, 2.4vw, 16px);
  background: var(--lo-panel);
  border: 1px solid var(--lo-panel-edge);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.lo-cell {
  font: inherit;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
  border: 1.5px solid var(--lo-off-edge);
  border-radius: 12px;
  background: var(--lo-off);
  transition: background .12s ease, box-shadow .12s ease, border-color .12s ease, transform .06s ease;
}
.lo-cell:active { transform: scale(.96); }
.lo-cell:focus-visible { outline: 3px solid var(--lo-on); outline-offset: 2px; }
.lo-cell.is-on {
  background: radial-gradient(circle at 32% 28%, var(--lo-on-2), var(--lo-on));
  border-color: var(--lo-on-edge);
  box-shadow: 0 0 0 1px var(--lo-on-edge) inset,
              0 0 18px color-mix(in srgb, var(--lo-on) 60%, transparent);
}
@supports not (background: color-mix(in srgb, red 50%, transparent)) {
  .lo-cell.is-on { box-shadow: 0 0 0 1px var(--lo-on-edge) inset, 0 0 18px rgba(244, 183, 64, .6); }
}
.lo-cell.is-hint {
  border-color: var(--lo-hint);
  box-shadow: 0 0 0 2px var(--lo-hint), 0 0 14px color-mix(in srgb, var(--lo-hint) 55%, transparent);
  animation: lo-pulse 1s ease-in-out infinite;
}
@keyframes lo-pulse {
  0%, 100% { box-shadow: 0 0 0 2px var(--lo-hint), 0 0 8px color-mix(in srgb, var(--lo-hint) 40%, transparent); }
  50% { box-shadow: 0 0 0 3px var(--lo-hint), 0 0 18px color-mix(in srgb, var(--lo-hint) 65%, transparent); }
}

/* ---- 오버레이(완주) ---- */
.lo-board-wrap > .lo-overlay,
.lo-board-wrap > .lo-board { grid-area: 1 / 1; }
.lo-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 20px;
  z-index: 3;
  background: color-mix(in srgb, var(--lo-panel) 82%, transparent);
  -webkit-backdrop-filter: blur(3px);
          backdrop-filter: blur(3px);
}
@supports not (background: color-mix(in srgb, red 50%, transparent)) {
  .lo-overlay { background: rgba(28, 26, 36, .92); }
}
.lo-overlay-panel {
  text-align: center;
  padding: var(--space-4) var(--space-5);
  max-width: 100%;
  color: #fff;
}
.lo-ov-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
}
.lo-ov-moves { margin: 0 0 var(--space-2); font-size: 1.05rem; color: rgba(255,255,255,.82); }
.lo-ov-moves b { font-size: 2.6rem; color: var(--lo-on); font-family: var(--font-serif); }
.lo-ov-line { margin: 0 0 var(--space-1); font-size: .95rem; color: rgba(255,255,255,.82); }
.lo-ov-line b { color: #fff; }
.lo-ov-hint { margin: var(--space-1) 0 var(--space-3); font-size: .86rem; color: rgba(255,255,255,.62); min-height: 1.2em; }
.lo-new { color: var(--lo-on); font-weight: 700; }

.lo-btn-big {
  font: inherit;
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  padding: 15px 40px;
  border-radius: 999px;
  border: 0;
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow);
}
.lo-btn-big:hover { filter: brightness(1.06); }
.lo-btn-big:active { transform: scale(.97); }

/* ---- 안내 문구 ---- */
.lo-msg {
  min-height: 1.7em;
  margin: var(--space-3) 0 0;
  text-align: center;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
}

/* ---- 본문 ---- */
.prose { max-width: 720px; margin: clamp(40px, 6vw, 64px) auto 0; }
.prose h2 { margin: 0 0 var(--space-3); }
.prose p { margin: 0 0 var(--space-3); color: var(--color-text); }
.prose ul { margin: 0; padding-left: 1.2em; }
.prose li { margin-bottom: var(--space-2); }
.prose li strong { color: var(--color-text); }

@media (prefers-reduced-motion: reduce) {
  .lo-cell { transition: none; }
  .lo-cell.is-hint { animation: none; }
}

@media (max-width: 420px) {
  .lo-lab { min-width: 100%; }
  .lo-actions { margin-left: 0; }
  .lo-stat { font-size: .9rem; }
  .lo-stat b { font-size: 1.2rem; }
}