:root {
  --logic-ink: #263431;
  --logic-muted: #62706c;
  --logic-line: #d9e4e0;
  --logic-green: #188b77;
  --logic-green-dark: #0e6d5d;
  --logic-green-soft: #e8f6f2;
  --logic-blue: #3977ad;
  --logic-red: #c94b4b;
  --logic-gold: #bd8524;
}

.logic-body {
  margin: 0;
  color: var(--logic-ink);
  background: linear-gradient(180deg, #f2faf7 0, #fff 420px);
}

.logic-header {
  border-bottom: 1px solid rgba(24, 139, 119, .14);
  background: rgba(255, 255, 255, .96);
}

.logic-header nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logic-header nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: 999px;
  color: #40504c;
  font-weight: 700;
  text-decoration: none;
}

.logic-header nav a.active,
.logic-header nav a:hover {
  color: var(--logic-green-dark);
  background: var(--logic-green-soft);
}

.logic-shell {
  max-width: 1080px;
  padding-top: 30px;
  padding-bottom: 70px;
}

.logic-shell .back-button {
  display: inline-flex;
  margin-bottom: 20px;
  color: var(--logic-green-dark);
  font-weight: 700;
  text-decoration: none;
}

.logic-card,
.logic-game,
.logic-summary,
.logic-guide {
  border: 1px solid var(--logic-line);
  border-radius: 26px;
  background: #fff;
  box-shadow: 0 18px 50px rgba(39, 72, 63, .08);
}

.logic-intro {
  padding: clamp(24px, 5vw, 52px);
}

.logic-intro-head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 20px;
}

.logic-intro-icon,
.logic-finish-icon {
  width: 82px;
  height: 82px;
  display: grid;
  place-items: center;
  border-radius: 23px;
  color: #fff;
  background: linear-gradient(145deg, var(--logic-green), #42b59e);
  box-shadow: 0 12px 28px rgba(24, 139, 119, .24);
  font-size: 32px;
  font-weight: 900;
}

[data-logic-game="danger-grid"] .logic-intro-icon,
[data-logic-game="danger-grid"] .logic-finish-icon {
  background: linear-gradient(145deg, #356f9f, #68a5d1);
  box-shadow: 0 12px 28px rgba(53, 111, 159, .24);
}

.logic-intro .eyebrow,
.logic-guide .eyebrow,
.logic-game .eyebrow {
  color: var(--logic-green-dark);
  letter-spacing: .12em;
  font-size: 13px;
  font-weight: 900;
}

.logic-intro h1,
.logic-summary h1 {
  margin: 5px 0 8px;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.25;
}

.logic-intro-head p {
  margin: 0;
  color: var(--logic-muted);
  font-size: 17px;
  line-height: 1.75;
}

.logic-level-title {
  margin: 32px 0 14px;
  font-size: 20px;
}

.logic-levels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.logic-level-button {
  min-height: 126px;
  padding: 18px;
  border: 2px solid var(--logic-line);
  border-radius: 18px;
  color: var(--logic-ink);
  background: #fff;
  cursor: pointer;
  text-align: left;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.logic-level-button:hover,
.logic-level-button:focus-visible {
  border-color: var(--logic-green);
  box-shadow: 0 10px 25px rgba(24, 139, 119, .13);
  transform: translateY(-2px);
}

.logic-level-button b,
.logic-level-button span,
.logic-level-button small {
  display: block;
}

.logic-level-button b {
  margin-bottom: 4px;
  font-size: 20px;
}

.logic-level-button span {
  color: var(--logic-green-dark);
  font-weight: 800;
}

.logic-level-button small {
  margin-top: 6px;
  color: var(--logic-muted);
  font-size: 14px;
  line-height: 1.5;
}

.logic-resume {
  margin-top: 18px;
  padding: 18px 20px;
  border-radius: 16px;
  background: #f7faf9;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.logic-resume p { margin: 0; line-height: 1.55; }
.logic-resume b { display: block; }
.logic-resume span { color: var(--logic-muted); font-size: 14px; }

.logic-button {
  min-height: 48px;
  padding: 0 19px;
  border: 0;
  border-radius: 13px;
  color: #fff;
  background: var(--logic-green);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.logic-button:hover { background: var(--logic-green-dark); }
.logic-button.secondary { color: var(--logic-green-dark); background: var(--logic-green-soft); }
.logic-button.secondary:hover { background: #d6eee8; }
.logic-button.ghost { color: #52615d; background: #f3f6f5; }
.logic-button.danger { color: #a03c3c; background: #fff0f0; }

.logic-game {
  padding: clamp(18px, 4vw, 34px);
}

.logic-game-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.logic-game-nav a,
.logic-game-nav button {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border: 1px solid #cfe2dd;
  border-radius: 11px;
  color: var(--logic-green-dark);
  background: #fff;
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.logic-game-nav a:hover,
.logic-game-nav button:hover { background: var(--logic-green-soft); }

.logic-game-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.logic-game-title h1 {
  margin: 2px 0 0;
  font-size: clamp(24px, 4vw, 34px);
}

.logic-stats {
  display: flex;
  gap: 8px;
}

.logic-stat {
  min-width: 92px;
  padding: 9px 12px;
  border: 1px solid var(--logic-line);
  border-radius: 13px;
  background: #f9fbfa;
  text-align: center;
}

.logic-stat small,
.logic-stat b { display: block; }
.logic-stat small { color: var(--logic-muted); font-size: 12px; }
.logic-stat b { margin-top: 2px; font-size: 19px; }

.sudoku-layout {
  display: grid;
  grid-template-columns: minmax(300px, 570px) minmax(240px, 1fr);
  align-items: start;
  gap: clamp(20px, 4vw, 36px);
}

.sudoku-board {
  --sudoku-size: 9;
  --box-cols: 3;
  display: grid;
  grid-template-columns: repeat(var(--sudoku-size), 1fr);
  grid-template-rows: repeat(var(--sudoku-size), minmax(0, 1fr));
  width: min(100%, 570px);
  aspect-ratio: 1;
  overflow: hidden;
  border: 3px solid #334843;
  border-radius: 8px;
  background: #334843;
  gap: 1px;
}

.sudoku-cell {
  position: relative;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  border: 0;
  color: #276598;
  background: #fff;
  cursor: pointer;
  font: inherit;
  font-size: clamp(18px, 4.1vw, 31px);
  font-weight: 800;
  padding: 0;
}

.sudoku-cell.box-right { box-shadow: inset -3px 0 #334843; }
.sudoku-cell.box-bottom { border-bottom: 3px solid #334843; }
.sudoku-cell.given { color: #27332f; background: #f5f7f6; }
.sudoku-cell.peer { background: #edf7f4; }
.sudoku-cell.same-value { background: #d8eee8; }
.sudoku-cell.selected { background: #c6e8df; outline: 3px solid var(--logic-green); outline-offset: -3px; z-index: 2; }
.sudoku-cell.conflict { color: #b32f2f; background: #ffe5e5; }
.sudoku-cell.checked-wrong { color: #b32f2f; background: #fff0d8; }
.sudoku-cell.hinted { color: #7a5a12; background: #fff6d9; }

.sudoku-notes {
  position: absolute;
  inset: 3px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: center;
  justify-items: center;
  color: #4d6660;
  font-size: clamp(8px, 1.45vw, 12px);
  font-weight: 700;
  line-height: 1;
}

.sudoku-board.size-4 .sudoku-notes { grid-template-columns: repeat(2, 1fr); font-size: clamp(12px, 2.5vw, 18px); }
.sudoku-board.size-6 .sudoku-notes { grid-template-columns: repeat(3, 1fr); font-size: clamp(9px, 1.8vw, 14px); }

.sudoku-controls h2 {
  margin: 0 0 10px;
  font-size: 18px;
}

.logic-message {
  min-height: 52px;
  margin-bottom: 14px;
  padding: 13px 15px;
  border-radius: 13px;
  color: #40504c;
  background: #f3f7f5;
  line-height: 1.55;
}

.logic-message.warn { color: #8d3b31; background: #fff0ed; }
.logic-message.ok { color: #146954; background: #e7f7f1; }

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

.sudoku-number {
  min-height: 54px;
  border: 2px solid #dbe7e3;
  border-radius: 13px;
  color: var(--logic-green-dark);
  background: #fff;
  font: inherit;
  font-size: 23px;
  font-weight: 900;
  cursor: pointer;
}

.sudoku-number:hover { border-color: var(--logic-green); background: var(--logic-green-soft); }

.sudoku-tools,
.logic-bottom-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}

.sudoku-mode {
  position: relative;
  grid-column: 1 / -1;
  min-height: 52px;
  border: 2px solid #cbded9;
  border-radius: 13px;
  color: #3f514c;
  background: #f8fbfa;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.sudoku-mode[aria-pressed="true"] {
  border-color: var(--logic-gold);
  color: #71500e;
  background: #fff5d7;
  box-shadow: 0 0 0 3px rgba(189, 133, 36, .12);
}

.sudoku-mode small { display: block; margin-top: 2px; font-size: 12px; font-weight: 600; }

.logic-mini-note {
  margin: 13px 0 0;
  color: var(--logic-muted);
  font-size: 14px;
  line-height: 1.6;
}

.danger-layout { display: grid; justify-items: center; }

.danger-toolbar {
  width: min(100%, 660px);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 14px;
}

.flag-mode {
  min-height: 50px;
  padding: 0 20px;
  border: 2px solid #b8ccda;
  border-radius: 14px;
  color: #315f80;
  background: #eef6fb;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.flag-mode[aria-pressed="true"] {
  border-color: #c98425;
  color: #744807;
  background: #fff1c9;
  box-shadow: 0 0 0 3px rgba(201, 132, 37, .14);
}

.danger-board {
  --danger-size: 8;
  width: min(100%, 660px);
  display: grid;
  grid-template-columns: repeat(var(--danger-size), 1fr);
  grid-template-rows: repeat(var(--danger-size), minmax(0, 1fr));
  aspect-ratio: 1;
  overflow: hidden;
  gap: 2px;
  padding: 4px;
  border: 3px solid #315d78;
  border-radius: 12px;
  background: #315d78;
  touch-action: manipulation;
}

.danger-cell {
  width: 100%;
  height: 100%;
  min-width: 0;
  border: 0;
  border-radius: 3px;
  color: #243b47;
  background: linear-gradient(145deg, #e8f3f9, #c8deeb);
  box-shadow: inset 2px 2px rgba(255,255,255,.7), inset -2px -2px rgba(49,93,120,.16);
  cursor: pointer;
  font: inherit;
  font-size: clamp(12px, 2.4vw, 24px);
  font-weight: 900;
  padding: 0;
}

.danger-cell:hover { background: #f1f8fc; }
.danger-cell.open { background: #f8fbfc; box-shadow: none; cursor: default; }
.danger-cell.flagged { color: #955b09; background: #fff0bd; }
.danger-cell.mine { color: #fff; background: #c84e4e; }
.danger-cell.n1 { color: #2367ad; }
.danger-cell.n2 { color: #238254; }
.danger-cell.n3 { color: #c44942; }
.danger-cell.n4 { color: #6c50a1; }
.danger-cell.n5, .danger-cell.n6, .danger-cell.n7, .danger-cell.n8 { color: #7c3d32; }

.danger-help { margin: 14px 0 0; color: var(--logic-muted); font-size: 14px; text-align: center; }

.logic-summary {
  padding: clamp(28px, 5vw, 54px);
  text-align: center;
}

.logic-finish-icon { margin: 0 auto 18px; }
.logic-summary p { color: var(--logic-muted); font-size: 17px; line-height: 1.7; }

.logic-summary-stats {
  max-width: 620px;
  margin: 28px auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.logic-summary-stats div {
  padding: 17px 10px;
  border-radius: 15px;
  background: #f4f8f6;
}

.logic-summary-stats small,
.logic-summary-stats b,
.logic-summary-stats span { display: block; }
.logic-summary-stats small { color: var(--logic-muted); }
.logic-summary-stats b { margin-top: 4px; font-size: 28px; }
.logic-summary-stats span { font-size: 13px; }

.logic-summary-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.logic-summary-actions a { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }

.logic-guide {
  margin-top: 28px;
  padding: clamp(24px, 5vw, 45px);
}

.logic-guide h2 { margin: 5px 0 12px; font-size: clamp(24px, 4vw, 34px); }
.logic-guide > p { max-width: 820px; margin: 0; color: var(--logic-muted); font-size: 16px; line-height: 1.8; }
.logic-guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 24px; }
.logic-guide-grid section { padding: 20px; border-radius: 16px; background: #f6f9f8; }
.logic-guide-grid h3 { margin: 0 0 8px; font-size: 17px; }
.logic-guide-grid p { margin: 0; color: var(--logic-muted); font-size: 15px; line-height: 1.7; }

/* ゲーム中は、結果表示や次の操作をスクロールなしで確認できる高さに収める。 */
body.logic-body:has(.logic-game) { overflow: hidden; }
body.logic-body:has(.logic-game) footer,
.logic-shell:has(.logic-game) > .back-button,
.logic-shell:has(.logic-game) > .logic-guide { display: none; }
.logic-shell:has(.logic-game) {
  height: calc(100dvh - 82px);
  padding-top: 8px;
  padding-bottom: 8px;
}
.logic-shell:has(.logic-game) #logic-game-root { height: 100%; }
.logic-shell:has(.logic-game) .logic-game {
  height: 100%;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  padding: 10px 14px 12px;
  overflow: hidden;
}
.logic-shell:has(.logic-game) .logic-game-top { margin-bottom: 8px; }
.logic-shell:has(.logic-game) .logic-game-title h1 { font-size: clamp(22px, 3vw, 30px); }
.logic-shell:has(.logic-game) .logic-stat { padding-block: 5px; }
.logic-shell:has(.logic-game) .sudoku-layout {
  min-height: 0;
  grid-template-columns: minmax(280px, 1fr) minmax(250px, 340px);
  align-items: center;
  gap: clamp(14px, 2.5vw, 28px);
}
.logic-shell:has(.logic-game) .sudoku-board {
  width: min(100%, calc(100dvh - 225px), 520px);
  justify-self: center;
}
.logic-shell:has(.logic-game) .logic-message { margin-bottom: 8px; padding-block: 9px; }
.logic-shell:has(.logic-game) .sudoku-number { min-height: 45px; }
.logic-shell:has(.logic-game) .sudoku-mode { min-height: 44px; }
.logic-shell:has(.logic-game) .sudoku-tools .logic-button { min-height: 42px; }
.logic-shell:has(.logic-game) .logic-mini-note { margin-top: 7px; font-size: 12px; line-height: 1.45; }
.logic-shell:has(.logic-game) .danger-layout {
  min-height: 0;
  grid-template-rows: auto auto minmax(0, 1fr) auto auto;
  align-items: center;
  overflow: hidden;
}
.logic-shell:has(.logic-game) .danger-layout > .logic-message { width: min(100%, 660px); }
.logic-shell:has(.logic-game) .danger-toolbar { margin-bottom: 8px; }
.logic-shell:has(.logic-game) .danger-board {
  width: min(100%, calc(100dvh - 405px), 570px);
  max-height: 100%;
}
.logic-shell:has(.logic-game) .danger-help { margin-top: 7px; }

@media (max-width: 760px) {
  .logic-header { padding: 10px 14px; }
  .logic-header .brand-logo { max-width: 142px; }
  .logic-header nav { gap: 2px; }
  .logic-header nav a { min-height: 40px; padding: 0 9px; font-size: 13px; }
  .logic-shell { padding: 18px 12px 52px; }
  .logic-intro-head { grid-template-columns: 1fr; }
  .logic-intro-icon { width: 66px; height: 66px; border-radius: 18px; font-size: 26px; }
  .logic-levels { grid-template-columns: 1fr; }
  .logic-level-button { min-height: 0; }
  .logic-resume { align-items: stretch; flex-direction: column; }
  .logic-game-top { align-items: flex-start; flex-direction: column; }
  .logic-stats { width: 100%; }
  .logic-stat { min-width: 0; flex: 1; }
  .sudoku-layout { grid-template-columns: 1fr; }
  .sudoku-board { justify-self: center; }
  .sudoku-controls { width: 100%; }
  .sudoku-pad { grid-template-columns: repeat(5, 1fr); }
  .sudoku-number { min-height: 48px; }
  .logic-guide-grid { grid-template-columns: 1fr; }

  body.logic-body:has(.logic-game) .logic-header { height: 70px; }
  .logic-shell:has(.logic-game) { height: calc(100dvh - 70px); padding: 5px 7px; }
  .logic-shell:has(.logic-game) .logic-game { padding: 7px; }
  .logic-shell:has(.logic-game) .logic-game-nav { flex-wrap: nowrap; margin-bottom: 5px; }
  .logic-shell:has(.logic-game) .logic-game-nav a,
  .logic-shell:has(.logic-game) .logic-game-nav button { flex: 1; min-height: 34px; padding: 4px 6px; font-size: 11px; }
  .logic-shell:has(.logic-game) .logic-game-top { flex-direction: row; align-items: center; margin-bottom: 5px; }
  .logic-shell:has(.logic-game) .logic-game-title .eyebrow { font-size: 10px; }
  .logic-shell:has(.logic-game) .logic-game-title h1 { font-size: 19px; }
  .logic-shell:has(.logic-game) .logic-stats { width: auto; }
  .logic-shell:has(.logic-game) .logic-stat { min-width: 68px; padding: 3px 5px; }
  .logic-shell:has(.logic-game) .logic-stat small { font-size: 9px; }
  .logic-shell:has(.logic-game) .logic-stat b { font-size: 14px; }
  .logic-shell:has(.logic-game) .sudoku-layout {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, auto) auto;
    align-content: start;
    gap: 6px;
    overflow: hidden;
  }
  .logic-shell:has(.logic-game) .sudoku-board { width: min(100%, 35dvh, 340px); }
  .logic-shell:has(.logic-game) .sudoku-controls h2,
  .logic-shell:has(.logic-game) .logic-mini-note { display: none; }
  .logic-shell:has(.logic-game) .logic-message { min-height: 34px; margin-bottom: 5px; padding: 6px 8px; font-size: 11px; line-height: 1.35; }
  .logic-shell:has(.logic-game) .sudoku-pad { grid-template-columns: repeat(5, 1fr); gap: 4px; }
  .logic-shell:has(.logic-game) .sudoku-number { min-height: 32px; border-radius: 8px; font-size: 17px; }
  .logic-shell:has(.logic-game) .sudoku-tools { grid-template-columns: 1.5fr repeat(2, 1fr); gap: 4px; margin-top: 4px; }
  .logic-shell:has(.logic-game) .sudoku-mode { grid-column: auto; min-height: 34px; font-size: 11px; }
  .logic-shell:has(.logic-game) .sudoku-mode small { display: none; }
  .logic-shell:has(.logic-game) .sudoku-tools .logic-button { min-height: 34px; padding: 0 5px; border-radius: 8px; font-size: 11px; }
  .logic-shell:has(.logic-game) .danger-layout { align-content: start; }
  .logic-shell:has(.logic-game) .danger-toolbar { margin-bottom: 5px; }
  .logic-shell:has(.logic-game) .danger-toolbar button { min-height: 35px; padding-inline: 10px; font-size: 12px; }
  .logic-shell:has(.logic-game) .danger-board { width: min(100%, calc(100dvh - 270px), 480px); }
  .logic-shell:has(.logic-game) .danger-help { font-size: 10px; }
}

@media (max-width: 420px) {
  .logic-header nav a:nth-child(1) { display: none; }
  .logic-game { padding: 14px 10px 20px; border-radius: 18px; }
  .sudoku-cell { font-size: clamp(17px, 7vw, 27px); }
  .sudoku-board.size-9 .sudoku-notes { inset: 1px; font-size: 7px; }
  .danger-board { gap: 1px; padding: 3px; }
  .danger-cell { font-size: clamp(10px, 4.6vw, 18px); }
  .logic-summary-stats { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .logic-level-button { transition: none; }
}