/* 2312 MOON_NONOGRAM — 레이아웃·컴포넌트
 * 그래프 페이퍼 + 틸 단색. 평면·헤어라인·여백. Space Grotesk + IBM Plex Mono.
 */
* { box-sizing: border-box; }
/* hidden 속성은 항상 우선 — .overlay/.board-cover/.side-panel 의 display 지정이 [hidden]을 덮지 않도록 */
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  color: var(--ink);
  background-color: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-weight: 700; line-height: 1.25; letter-spacing: -0.01em; }
.mono, .timer, .nono-hint, .big-time { font-family: 'JetBrains Mono', ui-monospace, monospace; }

.wrap { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 18px; }
.sr-title, .sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- 헤더 ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  position: sticky; top: 0; z-index: 30;
}
.header-in { display: flex; align-items: center; gap: 16px; height: 58px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 18px; letter-spacing: -0.02em; }
.brand .mark {
  display: grid; grid-template-columns: repeat(2, 8px); grid-template-rows: repeat(2, 8px);
  gap: 2px; padding: 4px; border: 1px solid var(--line-strong); border-radius: 5px;
}
.brand .mark i { display: block; width: 8px; height: 8px; background: var(--line-strong); }
.brand .mark i.on { background: var(--accent); }
.header-nav { display: flex; gap: 4px; margin-left: 10px; flex: 1; }
.header-nav a {
  padding: 7px 11px; font-size: 14px; color: var(--ink-2); border-radius: 6px; font-weight: 600;
}
.header-nav a:hover { color: var(--ink); background: var(--surface-2); }
.header-tools { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  display: inline-grid; place-items: center; width: 36px; height: 36px;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-2);
  border-radius: 7px; cursor: pointer; font-size: 15px;
}
.icon-btn:hover { color: var(--ink); border-color: var(--line-strong); }
.lang-select {
  height: 36px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2);
  border-radius: 7px; padding: 0 8px; font-size: 13px; font-family: inherit; cursor: pointer; max-width: 130px;
}

/* ---------- 게임 메인 ---------- */
.play-main { padding: 16px 0 30px; }
.play-area { max-width: 720px; margin: 0 auto; }
.play-top {
  display: flex; align-items: center; justify-content: center; gap: 14px; margin-bottom: 12px;
}
.timer {
  font-size: 20px; font-weight: 600; color: var(--ink); min-width: 62px; text-align: center;
  font-variant-numeric: tabular-nums;
}
.diff-label {
  font-size: 13px; color: var(--ink-2); font-weight: 600; padding: 3px 10px;
  border: 1px solid var(--line); border-radius: 999px; text-transform: capitalize;
}

/* ---------- 보드 ---------- */
.board-wrap {
  position: relative; display: flex; justify-content: center;
  padding: 10px; margin: 0 auto; overflow: auto;
}
#board {
  --cell: 32px;
  display: grid; gap: 0;
  background: var(--grid-tint);
  padding: 1px;
  border: 1px solid var(--line-strong);
  user-select: none; -webkit-user-select: none; touch-action: none;
}
.nono-corner { background: transparent; }
.nono-hint {
  display: grid; place-items: center;
  width: var(--cell); height: var(--cell);
  font-size: var(--cellfont); font-weight: 600; color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}
.nono-hint.col { align-items: end; padding-bottom: 2px; }
.nono-hint.row { justify-items: end; padding-right: 3px; }
.nono-hint.grp { color: var(--ink); }

.nono-cell {
  width: var(--cell); height: var(--cell);
  padding: 0; margin: 0; border: 0; cursor: pointer;
  background: var(--cell-bg);
  box-shadow: inset -1px -1px 0 var(--line), inset 1px 1px 0 var(--line);
  position: relative;
}
.nono-cell.bl { box-shadow: inset -1px -1px 0 var(--line), inset 2px 1px 0 var(--line-strong); }
.nono-cell.bt { box-shadow: inset -1px -1px 0 var(--line), inset 1px 2px 0 var(--line-strong); }
.nono-cell.bl.bt { box-shadow: inset -1px -1px 0 var(--line), inset 2px 2px 0 var(--line-strong); }
.nono-cell.on { background: var(--fill); }
.nono-cell.x::after {
  content: '×'; position: absolute; inset: 0; display: grid; place-items: center;
  color: var(--x); font-size: calc(var(--cell) * 0.62); font-weight: 400; line-height: 1;
}
.nono-cell.err { background: var(--danger); box-shadow: inset 0 0 0 1px var(--danger); }
.nono-cell.flash { animation: flash .5s ease; }
@keyframes flash { 0% { transform: scale(0.7); } 60% { transform: scale(1.08); } 100% { transform: scale(1); } }

.board-cover {
  position: absolute; inset: 10px; display: grid; place-items: center;
  background: var(--surface); color: var(--ink-2); font-weight: 600; font-size: 15px;
  border: 1px solid var(--line); cursor: pointer; z-index: 5;
}

/* ---------- 도구 ---------- */
.tools {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin: 18px auto 0; max-width: 560px;
}
.mode-btn, .tool-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 50px; height: 50px; padding: 0; cursor: pointer;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-2);
  border-radius: 9px;
}
.mode-btn svg, .tool-btn svg { width: 22px; height: 22px; }
.mode-btn:hover, .tool-btn:hover { color: var(--ink); border-color: var(--line-strong); }
.mode-btn.active { color: var(--accent-2); border-color: var(--accent-line); background: var(--accent-soft); }
.mode-btn .swatch { width: 22px; height: 22px; border-radius: 5px; }
.mode-btn.fill .swatch { background: var(--fill); }
.mode-btn.mark .swatch { display: grid; place-items: center; border: 1px solid var(--line-strong); color: var(--x); font-size: 16px; }

/* ---------- 광고 (애드핏 규정: 래퍼 border-radius/overflow 금지) ---------- */
.ad-wrap { margin: 26px auto 4px; display: flex; justify-content: center; }
.ad-grid { display: flex; flex-direction: column; align-items: center; gap: 14px; width: 100%; max-width: 672px; margin: 0 auto; }
.ad-grid[data-ad-layout="mixed"] { max-width: 760px; }
.ad-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; width: 100%; }
.ad-cell { min-height: 50px; }

/* ---------- FAB · 패널 ---------- */
.fab-stack { position: fixed; right: 18px; bottom: 18px; display: flex; flex-direction: column; gap: 10px; z-index: 40; }
.fab {
  display: inline-flex; align-items: center; gap: 8px; padding: 11px 15px;
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink);
  border-radius: 999px; cursor: pointer; font-family: inherit; font-size: 13px; font-weight: 600;
}
.fab svg { width: 18px; height: 18px; }
/* 우하단 설정 버튼 무채 통일 — 채움 없이 .fab 기본(테두리만) 사용 */
.fab:hover { border-color: var(--accent-line); }
.fab-txt { display: none; }   /* 글자 최소화: FAB는 아이콘만(aria-label 유지) */

.side-panel {
  position: fixed; right: 18px; bottom: 84px; width: 300px; max-width: calc(100vw - 36px);
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: 12px;
  z-index: 45; overflow: hidden;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; padding: 13px 15px; border-bottom: 1px solid var(--line); }
.panel-head h3 { margin: 0; font-size: 15px; }
.panel-close { border: 0; background: none; color: var(--ink-3); font-size: 16px; cursor: pointer; }
.panel-body { padding: 15px; }
.set-block { margin-bottom: 16px; }
.set-label { font-size: 12px; color: var(--ink-3); font-weight: 600; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.04em; }
.seg { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; }
.seg .tab {
  padding: 9px 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2);
  border-radius: 8px; cursor: pointer; font-family: inherit; font-size: 13px; font-weight: 600; text-align: center;
}
.seg .tab.active { color: var(--accent-2); border-color: var(--accent-line); background: var(--accent-soft); }
.set-row { display: flex; align-items: center; justify-content: space-between; padding: 6px 0; }
.switch { position: relative; width: 42px; height: 24px; border-radius: 999px; border: 1px solid var(--line-strong); background: var(--surface-2); cursor: pointer; }
.switch .knob { position: absolute; top: 2px; left: 2px; width: 18px; height: 18px; border-radius: 50%; background: var(--ink-3); transition: .18s; }
.switch.on { background: var(--accent-soft); border-color: var(--accent-line); }
.switch.on .knob { left: 20px; background: var(--accent); }
.row-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 14px; }
.ghost-btn { padding: 9px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 8px; cursor: pointer; font-family: inherit; font-size: 13px; font-weight: 600; }
.ghost-btn:hover { border-color: var(--line-strong); }
.panel-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.28); z-index: 42; }

.stats { display: flex; flex-direction: column; gap: 2px; }
.stat-row { display: grid; grid-template-columns: 1fr auto auto; gap: 12px; padding: 9px 4px; border-bottom: 1px solid var(--line); font-size: 14px; }
.stat-row:last-child { border-bottom: 0; }
.stat-row .d { color: var(--ink-2); font-weight: 600; text-transform: capitalize; }
.stat-row .n { min-width: 48px; text-align: right; font-variant-numeric: tabular-nums; }
.stat-row .n b { color: var(--accent-2); }

/* ---------- 완료 오버레이 ---------- */
.overlay { position: fixed; inset: 0; display: grid; place-items: center; background: rgba(0,0,0,0.42); z-index: 60; padding: 20px; }
.overlay-card { background: var(--surface); border: 1px solid var(--line-strong); border-radius: 16px; padding: 26px; width: 340px; max-width: 100%; text-align: center; }
.badge { display: inline-grid; place-items: center; width: 46px; height: 46px; margin: 0 auto 12px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-2); }
.badge svg { width: 26px; height: 26px; }
.overlay-card h2 { margin: 0 0 4px; font-size: 21px; }
.big-time { font-size: 34px; font-weight: 700; color: var(--ink); margin: 6px 0; }
.ov-meta { color: var(--ink-2); font-size: 13px; margin-bottom: 14px; }
.ov-preview { display: grid; gap: 1px; width: 132px; margin: 0 auto 18px; background: var(--line); border: 1px solid var(--line); }
.ov-preview i { display: block; aspect-ratio: 1; background: var(--surface); }
.ov-preview i.on { background: var(--fill); }
.btn-primary { display: inline-block; padding: 12px 20px; border: 0; border-radius: 10px; background: var(--accent); color: #fff; font-family: inherit; font-size: 15px; font-weight: 700; cursor: pointer; }
:root[data-theme="dark"] .btn-primary { color: #06201d; }
.ov-actions { display: flex; gap: 10px; justify-content: center; margin-top: 2px; }
.ov-actions .ghost-btn, .ov-actions .btn-primary { flex: 1; }

/* ---------- 스테이지 선택 화면 ---------- */
.stage-screen { padding: 34px 18px 50px; }
.stage-head { max-width: 560px; margin: 0 auto 26px; text-align: center; }
.stage-brand { font-size: 32px; font-weight: 800; letter-spacing: -0.02em; }
.stage-summary { margin-top: 6px; font-size: 13px; color: var(--ink-3); font-family: 'JetBrains Mono', ui-monospace, monospace; }
.stage-list { max-width: 560px; margin: 0 auto; }
.level-sec { margin-bottom: 24px; }
.level-head { display: flex; align-items: center; gap: 8px; margin: 0 0 11px; }
.level-fires { display: inline-flex; gap: 3px; color: var(--ink); }
.level-fires svg { width: 16px; height: 16px; }
.level-size { font-size: 13px; color: var(--ink-3); font-family: 'JetBrains Mono', ui-monospace, monospace; }
.stage-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(88px, 1fr)); gap: 10px; }
.stage-cell { position: relative; aspect-ratio: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; padding: 8px; border: 1px solid var(--line-strong); background: var(--surface); border-radius: 12px; cursor: pointer; }
.stage-cell:hover { border-color: var(--accent); }
.stage-cell.random { border-style: dashed; }
.stage-num { font-size: 26px; font-weight: 700; color: var(--ink-2); font-family: 'JetBrains Mono', ui-monospace, monospace; }
.stage-rnd { font-size: 34px; font-weight: 800; color: var(--ink-3); font-family: 'JetBrains Mono', ui-monospace, monospace; }
.stage-thumb { display: grid; width: 62%; aspect-ratio: 1; gap: 1px; }
.stage-thumb i { display: block; background: transparent; }
.stage-thumb i.on { background: var(--fill); }
.stage-check { position: absolute; top: 7px; right: 9px; font-size: 12px; font-weight: 700; color: var(--accent); }
@media (max-width: 420px) { .stage-grid { grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); } }

/* ---------- 문서 페이지 (about·기법·가이드·난이도) ---------- */
main { padding: 26px 0 40px; }
.doc { max-width: 760px; margin: 0 auto; }
.doc h1 { font-size: 30px; margin: 4px 0 10px; }
.doc h2 { font-size: 20px; margin: 30px 0 12px; padding-top: 8px; border-top: 1px solid var(--line); }
.doc p { margin: 0 0 14px; color: var(--ink); }
.doc ul, .doc ol { margin: 0 0 16px; padding-left: 20px; }
.doc li { margin: 6px 0; }
.lead { font-size: 17px; color: var(--ink-2); }
.muted { color: var(--ink-3); font-size: 13px; }
.breadcrumb { font-size: 13px; color: var(--ink-3); margin-bottom: 10px; }
.breadcrumb a { color: var(--ink-2); }
.breadcrumb a:hover { color: var(--accent-2); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin: 6px 0 18px; }
.card { display: block; padding: 15px; border: 1px solid var(--line); border-radius: 11px; background: var(--surface); }
.card:hover { border-color: var(--accent-line); }
.card .tag { display: inline-block; font-size: 11px; font-weight: 700; color: var(--accent-2); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 6px; }
.card h3 { margin: 0 0 5px; font-size: 16px; }
.card p { margin: 0; font-size: 13px; color: var(--ink-2); }
.faq details { border: 1px solid var(--line); border-radius: 10px; padding: 4px 14px; margin-bottom: 8px; background: var(--surface); }
.faq summary { padding: 11px 0; font-weight: 600; cursor: pointer; }
.faq .a { padding: 0 0 12px; color: var(--ink-2); }
.pager { display: flex; justify-content: space-between; gap: 12px; margin: 22px 0; font-size: 14px; }
.pager a { color: var(--accent-2); font-weight: 600; }
.start-link { display: inline-block; margin-top: 6px; padding: 10px 18px; border-radius: 9px; background: var(--accent); color: #fff; font-weight: 700; }
:root[data-theme="dark"] .start-link { color: #06201d; }

/* ---------- 푸터 ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--surface); margin-top: 20px; }
.site-footer.mini { position: static; }
.footer-in { padding: 26px 0 20px; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; max-width: 620px; }
.footer-cols h4 { margin: 0 0 8px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-3); }
.footer-cols a { display: block; padding: 3px 0; font-size: 14px; color: var(--ink-2); }
.footer-cols a:hover { color: var(--accent-2); }
.copyright { margin-top: 18px; padding: 14px 0 0; font-size: 12px; color: var(--ink-3); }
.site-footer.mini .copyright { margin: 0; padding: 14px 0; text-align: center; }

/* ---------- 반응형 ---------- */
@media (max-width: 720px) {
  .header-nav { display: none; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
  .fab-txt { display: none; }
  .fab { padding: 12px; }
  .side-panel { right: 12px; left: 12px; width: auto; bottom: 78px; }
  .doc h1 { font-size: 25px; }
}
@media (max-width: 420px) {
  .footer-cols { grid-template-columns: 1fr; }
  .mode-btn, .tool-btn { min-width: 56px; padding: 8px 9px; }
}