:root {
  --page-bg: #ebe2d1;
  --panel: rgba(248, 242, 229, 0.94);
  --panel-border: #d8c6a5;
  --text-main: #2e261a;
  --text-soft: #665845;
  --accent: #b88630;
  --accent-dark: #8e6420;
  --board-bg: #f7f1e4;
  --board-line: #9d8b68;
  --board-strong: #5a4c36;
  --board-highlight: #e8dfc7;
  --board-selected: #d9e9d6;
  --board-conflict: #f4d5d1;
  --board-fixed: #3e3426;
  --board-input: #274634;
  --shadow-soft: 0 16px 40px rgba(30, 28, 22, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.58), transparent 24%),
    linear-gradient(180deg, #f1e7d3 0%, var(--page-bg) 62%, #dacba9 100%);
}

html,
body {
  max-width: 100%;
  overflow-x: hidden;
}

a,
button,
input,
select,
textarea {
  font: inherit;
}

a {
  color: inherit;
}

.page-shell {
  width: min(1440px, calc(100vw - 48px));
  margin: 0 auto;
  padding: 18px 0 max(52px, env(safe-area-inset-bottom));
}

.hero {
  display: block;
  margin-bottom: 14px;
}

.hero-copy,
.hero-panel,
.intro-panel,
.control-bar,
.board-panel,
.number-pad-panel,
.content-panel,
.faq-panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  box-shadow: var(--shadow-soft);
}

.hero-copy {
  padding: 14px 18px;
}

.hero-panel,
.intro-panel,
.content-panel,
.number-pad-panel,
.faq-panel {
  padding: 24px 26px;
}

.breadcrumb {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  color: var(--text-soft);
}

.breadcrumb a {
  text-decoration: none;
}

.control-bar {
  padding: 12px 16px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  margin-bottom: 12px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.84rem;
  font-weight: 700;
}

.crumb-link {
  text-decoration: none;
}

h1,
h2 {
  margin: 0;
  font-weight: 700;
}

h1 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.15;
  margin-bottom: 10px;
}

.lead,
.hero-panel ul,
.content-panel p {
  color: var(--text-soft);
  line-height: 1.72;
}

.lead {
  max-width: 62ch;
  font-size: 1.16rem;
  margin: 0;
}

.hero-actions {
  display: flex;
  gap: 10px;
  margin-top: 0;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 22px;
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.primary-button {
  border: 0;
  color: #fffaf0;
  background: linear-gradient(180deg, #d6ab52, var(--accent));
  box-shadow: 0 8px 18px rgba(184, 134, 48, 0.28);
}

.secondary-button {
  color: var(--text-main);
  background: #eadfc7;
  border: 1px solid #ceb98d;
}

.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-1px);
}

.primary-button:focus-visible,
.secondary-button:focus-visible,
.difficulty-picker select:focus-visible,
.number-pad-button:focus-visible,
.sudoku-cell:focus-visible {
  outline: 3px solid rgba(255, 248, 209, 0.96);
  outline-offset: 2px;
}

.hero-panel h2,
.content-panel h2,
.number-pad-panel h2,
.intro-panel h2,
.faq-panel h2 {
  font-size: 1.55rem;
  margin-bottom: 10px;
}

.hero-panel ul {
  margin: 0;
  padding-left: 22px;
}

.intro-panel p,
.faq-panel p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.72;
}

.status-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.76rem;
  color: var(--text-soft);
}

.status-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.status-group strong {
  display: block;
  font-size: 1.2rem;
  line-height: 1.25;
  min-height: 1.4em;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.difficulty-picker {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.difficulty-picker select {
  min-width: 160px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid #cdbb97;
  background: #fbf6ec;
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) 320px;
  gap: 22px;
  align-items: start;
}

.board-panel {
  position: relative;
  padding: 24px;
}

.sudoku-board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 0;
  width: min(720px, 100%);
  margin: 0 auto;
  background: var(--board-strong);
  padding: 3px;
  border-radius: 20px;
}

.sudoku-cell {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid var(--board-line);
  background: var(--board-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.9rem;
  color: var(--board-input);
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
}

.sudoku-cell.fixed {
  font-weight: 700;
  color: var(--board-fixed);
}

.sudoku-cell.selected {
  background: var(--board-selected);
}

.sudoku-cell.related {
  background: var(--board-highlight);
}

.sudoku-cell.conflict {
  background: var(--board-conflict);
}

.sudoku-cell.box-right {
  border-right: 3px solid var(--board-strong);
}

.sudoku-cell.box-bottom {
  border-bottom: 3px solid var(--board-strong);
}

.sudoku-cell .cell-value {
  position: relative;
  z-index: 1;
}

.notes-grid {
  position: absolute;
  inset: 6px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 2px;
  font-size: 0.72rem;
  color: #6a7a63;
}

.note {
  display: flex;
  align-items: center;
  justify-content: center;
}

.side-panel {
  display: grid;
  gap: 18px;
}

.number-pad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 12px;
  margin-bottom: 14px;
}

.number-pad-button {
  min-height: 68px;
  border-radius: 18px;
  border: 1px solid #ccb791;
  background: #faf4e8;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--board-input);
  cursor: pointer;
}

.number-pad-button:hover {
  background: #f0e6d2;
}

.full-width {
  width: 100%;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.seo-content {
  display: grid;
  gap: 18px;
  margin-top: 20px;
}

.content-panel p {
  margin: 0;
}

.faq-panel {
  margin-top: 0;
}

.faq-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 16px;
}

.faq-item {
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 251, 243, 0.72);
  border: 1px solid #e4d6b7;
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
}

.faq-item p {
  margin: 0;
}

.win-overlay {
  position: absolute;
  inset: 24px;
  display: grid;
  place-items: center;
  background: rgba(29, 53, 38, 0.58);
  border-radius: 24px;
  z-index: 20;
}

.win-overlay[hidden] {
  display: none;
}

.win-panel {
  width: min(480px, calc(100% - 32px));
  padding: 32px 30px;
  text-align: center;
  background: rgba(248, 242, 227, 0.98);
  border: 1px solid #dbc89c;
  border-radius: 24px;
  box-shadow: 0 18px 40px rgba(20, 28, 21, 0.28);
}

.win-kicker {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.82rem;
  font-weight: 700;
}

.win-panel h2 {
  font-size: 2.4rem;
  margin-bottom: 10px;
}

.win-summary {
  margin: 0 0 22px;
  color: var(--text-soft);
  line-height: 1.6;
}

@media (max-width: 1024px) {
  .page-shell {
    width: min(100%, calc(100vw - 24px));
    padding: 20px 0 32px;
  }

  .hero,
  .game-layout {
    grid-template-columns: 1fr;
  }

  .control-bar {
    grid-template-columns: 1fr 1fr;
  }

  .side-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100%, calc(100vw - 16px));
    padding: 12px 0 24px;
  }

  .hero-copy,
  .hero-panel,
  .intro-panel,
  .control-bar,
  .board-panel,
  .number-pad-panel,
  .content-panel,
  .faq-panel {
    padding: 16px;
    border-radius: 18px;
  }

  h1 {
    font-size: 1.75rem;
  }

  .breadcrumb {
    margin-bottom: 10px;
  }

  .hero-actions {
    gap: 8px;
  }

  .primary-button,
  .secondary-button {
    padding: 11px 16px;
    font-size: 0.96rem;
    min-height: 48px;
  }

  .control-bar,
  .side-panel,
  .content-grid,
  .faq-list {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .control-bar {
    padding: 12px;
  }

  .difficulty-picker select {
    min-width: 0;
    width: 100%;
    min-height: 48px;
  }

  .status-group strong {
    min-height: 1.3em;
  }

  .game-layout {
    display: flex;
    flex-direction: column;
  }

  .side-panel {
    display: contents;
  }

  .board-panel {
    order: 1;
    overflow-x: hidden;
  }

  .number-pad-panel {
    order: 2;
    padding: 12px;
  }

  .side-panel .content-panel {
    order: 3;
  }

  .board-panel {
    padding: 10px;
  }

  .sudoku-board {
    width: 100%;
    max-width: calc(100vw - 36px);
    min-width: 0;
    border-radius: 16px;
  }

  .sudoku-cell {
    font-size: clamp(1.05rem, 5vw, 1.35rem);
    min-width: 0;
    min-height: 0;
  }

  .notes-grid {
    font-size: 0.58rem;
    inset: 4px;
  }

  .number-pad-button {
      min-width: 48px;
      min-height: 48px;
      border-radius: 14px;
      font-size: 1.2rem;
    }

  .win-overlay {
    inset: 12px;
  }

  .win-panel {
    padding: 24px 18px;
    border-radius: 18px;
  }
}