:root {
  color-scheme: light;
  --bg: #f7f5f0;
  --panel: #fffdf8;
  --panel-soft: #fbfaf6;
  --ink: #111827;
  --muted: #667085;
  --line: #d9d6ce;
  --line-heavy: #1f2d3d;
  --accent: #2f73df;
  --accent-strong: #1f65d6;
  --accent-soft: #eaf3ff;
  --related: #eaf4ff;
  --box: #f1f7ff;
  --match: #dff3e8;
  --match-ink: #08734d;
  --error: #ffe0dc;
  --error-ink: #a51c16;
  --given: #101828;
  --player: #25415f;
  --shadow: 0 24px 70px rgba(35, 32, 26, 0.13);
  --soft-shadow: 0 12px 28px rgba(35, 32, 26, 0.09);
  --radius: 20px;
  --board-size: min(76vw, 620px);
  font-family: ui-serif, Georgia, "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 5%, rgba(47, 115, 223, 0.08), transparent 24rem),
    linear-gradient(180deg, #fffdf9 0%, var(--bg) 100%);
}

button,
select {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

[hidden] {
  display: none !important;
}

.app-shell {
  width: min(1120px, calc(100% - 28px));
  margin: 14px auto;
  padding: 28px;
  background: rgba(255, 253, 248, 0.82);
  border: 1px solid rgba(25, 35, 50, 0.09);
  border-radius: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.title-screen {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(300px, 440px);
  gap: clamp(28px, 7vw, 86px);
  align-items: center;
  min-height: min(720px, calc(100vh - 84px));
  padding: clamp(18px, 5vw, 58px);
}

.title-screen .brand {
  align-items: flex-start;
  flex-direction: column;
  gap: 22px;
}

.title-screen .brand h1 {
  font-size: clamp(4.4rem, 13vw, 9.5rem);
}

.title-screen .brand-mark {
  width: 86px;
  height: 86px;
}

.title-card,
.settings-card {
  padding: 24px;
  border: 1px solid rgba(25, 35, 50, 0.09);
  border-radius: 20px;
  background: rgba(255, 253, 248, 0.92);
  box-shadow: var(--soft-shadow);
}

.title-copy,
.save-note,
.settings-card p {
  margin: 0;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

.title-copy {
  margin-bottom: 18px;
  font-size: 1.05rem;
}

.title-actions {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.title-actions .primary-button,
.completion-actions .primary-button {
  grid-column: auto;
}

.save-note {
  margin-top: 16px;
  text-align: center;
  font-size: 0.92rem;
}

.game-screen {
  min-height: min(780px, calc(100vh - 84px));
}

.game-topbar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: max-content;
}

.brand h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4.1rem);
  line-height: 1;
  letter-spacing: 0;
  font-weight: 650;
}

.brand-mark {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  width: 66px;
  height: 66px;
  padding: 7px;
  border: 4px solid var(--accent);
  border-radius: 11px;
  background: #f8fbff;
  box-shadow: inset 0 0 0 1px rgba(47, 115, 223, 0.18);
}

.brand-mark span {
  border-radius: 2px;
  background: #cfe2ff;
}

.topbar-controls {
  display: flex;
  align-items: stretch;
  gap: 14px;
}

.field,
.timer-card,
.mistake-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 58px;
  padding: 9px 14px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 3px 12px rgba(31, 45, 61, 0.04);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.field {
  flex-direction: column;
  align-items: flex-start;
  gap: 5px;
}

.field span,
.timer-card span {
  font-size: 0.82rem;
  color: var(--muted);
}

select {
  width: 148px;
  border: 0;
  color: var(--ink);
  background: transparent;
  font-size: 1rem;
  font-weight: 700;
  outline: none;
  cursor: pointer;
}

.timer-card {
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  min-width: 112px;
}

.timer-card strong {
  font-size: 1.65rem;
  line-height: 1;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.primary-button,
.menu-button,
.icon-button,
.action-button,
.number-button {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
  color: var(--ink);
  border-radius: 12px;
  box-shadow: 0 8px 22px rgba(31, 45, 61, 0.07);
  cursor: pointer;
  transition: transform 150ms ease, border-color 150ms ease, background 150ms ease, box-shadow 150ms ease, color 150ms ease;
}

.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 58px;
  padding: 0 19px;
  border-color: rgba(8, 115, 77, 0.5);
  color: #075d42;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  font-weight: 800;
}

.menu-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 58px;
  padding: 0 19px;
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  font-weight: 800;
}

.icon-button {
  display: grid;
  place-items: center;
  width: 58px;
  min-width: 58px;
  height: 58px;
  padding: 0;
  color: var(--ink);
}

svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.primary-button:hover,
.menu-button:hover,
.icon-button:hover,
.action-button:hover,
.number-button:hover {
  transform: translateY(-1px);
  border-color: rgba(47, 115, 223, 0.35);
  box-shadow: 0 12px 28px rgba(31, 45, 61, 0.11);
}

.primary-button:active,
.menu-button:active,
.icon-button:active,
.action-button:active,
.number-button:active {
  transform: translateY(1px);
}

.primary-button:focus-visible,
.menu-button:focus-visible,
.icon-button:focus-visible,
.action-button:focus-visible,
.number-button:focus-visible,
.cell:focus-visible,
select:focus-visible,
.mistake-toggle:focus-within {
  outline: 3px solid rgba(47, 115, 223, 0.28);
  outline-offset: 3px;
}

button:disabled,
button[aria-disabled="true"] {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
}

button:disabled:hover,
button[aria-disabled="true"]:hover {
  transform: none;
  border-color: var(--line);
  box-shadow: none;
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 26px;
  align-items: start;
}

.board-section {
  min-width: 0;
}

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

.board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  width: var(--board-size);
  height: var(--board-size);
  overflow: hidden;
  background: var(--panel);
  border: 3px solid var(--line-heavy);
  border-radius: 9px;
  box-shadow: var(--soft-shadow);
}

.cell {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  min-width: 0;
  aspect-ratio: 1;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: rgba(255, 255, 255, 0.58);
  box-shadow: none;
  color: var(--player);
  font-family: ui-serif, Georgia, "Times New Roman", serif;
  font-size: clamp(1.48rem, 5.3vw, 2.65rem);
  line-height: 1;
  font-weight: 520;
  cursor: pointer;
  transition: background-color 120ms ease, color 120ms ease, box-shadow 120ms ease;
}

.cell:nth-child(3n) {
  border-right-width: 3px;
  border-right-color: var(--line-heavy);
}

.cell:nth-child(9n) {
  border-right: 0;
}

.cell[data-row="2"],
.cell[data-row="5"] {
  border-bottom-width: 3px;
  border-bottom-color: var(--line-heavy);
}

.cell[data-row="8"] {
  border-bottom: 0;
}

.cell.given {
  color: var(--given);
  font-weight: 760;
}

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

.cell.box-related {
  background: var(--box);
}

.cell.matching {
  background: var(--match);
  color: var(--match-ink);
}

.cell.error {
  background: var(--error);
  color: var(--error-ink);
}

.cell.selected {
  z-index: 1;
  background: #eef6ff;
  box-shadow: inset 0 0 0 3px var(--accent);
  color: var(--accent-strong);
}

.notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: 86%;
  height: 82%;
  align-items: center;
  justify-items: center;
  color: #596579;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: clamp(0.47rem, 1.55vw, 0.77rem);
  line-height: 1;
  font-weight: 650;
}

.status-strip {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px;
  align-items: center;
  width: min(var(--board-size), 100%);
  margin: 18px auto 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(31, 45, 61, 0.06);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.status-icon,
.completion-badge {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(145deg, #0c7a5b, #0f9f74);
  color: white;
  box-shadow: 0 8px 20px rgba(8, 115, 77, 0.22);
}

.status-strip strong {
  display: block;
  font-size: 1rem;
}

.status-strip span {
  color: var(--muted);
  font-size: 0.9rem;
}

.progress {
  min-width: 86px;
  padding-left: 18px;
  border-left: 1px solid var(--line);
  text-align: center;
}

.progress strong {
  font-size: 1.45rem;
}

.controls-section {
  display: flex;
  flex-direction: column;
  gap: 15px;
  padding-top: 3px;
}

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

.number-button {
  display: grid;
  place-items: center;
  min-height: 64px;
  font-family: ui-serif, Georgia, "Times New Roman", serif;
  font-size: 2.15rem;
}

.number-button.active {
  background: linear-gradient(145deg, #347fe6, #2468d6);
  color: white;
  border-color: transparent;
}

.number-button.complete {
  border-color: rgba(217, 214, 206, 0.4);
  background: rgba(255, 255, 255, 0.4);
  color: rgba(17, 24, 39, 0.4);
  box-shadow: none;
  cursor: not-allowed;
}

.number-button.complete:hover {
  transform: none;
  border-color: rgba(217, 214, 206, 0.4);
  box-shadow: none;
}

.number-button:disabled {
  opacity: 1;
}

.action-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.action-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 74px;
  padding: 12px;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  font-weight: 760;
}

.action-button small {
  display: grid;
  place-items: center;
  min-width: 25px;
  height: 25px;
  padding: 0 6px;
  border-radius: 999px;
  background: #0b7d5d;
  color: white;
  font-size: 0.78rem;
}

.toggle-button[aria-pressed="true"] {
  border-color: rgba(8, 115, 77, 0.42);
  background: #f4fbf7;
  color: #075d42;
}

.danger {
  color: #a51c16;
}

.mistake-toggle {
  justify-content: center;
  min-height: 52px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 720;
}

.mistake-toggle input {
  width: 19px;
  height: 19px;
  accent-color: var(--accent);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(17, 24, 39, 0.34);
  backdrop-filter: blur(8px);
}

.modal-backdrop[hidden] {
  display: none;
}

.completion-card,
.settings-card {
  width: min(420px, 100%);
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, 0.66);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
  text-align: center;
}

.settings-card {
  width: min(480px, 100%);
  text-align: left;
}

.settings-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.settings-head h2 {
  margin: 0 0 6px;
  font-size: 2rem;
}

.settings-list {
  display: grid;
  gap: 12px;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 58px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.78);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 760;
}

.settings-row span {
  color: var(--muted);
}

.settings-modal .action-button,
.settings-list .action-button {
  width: 100%;
}

#settingsModal[data-context="title"] .puzzle-setting {
  display: none;
}

.completion-badge {
  margin: 0 auto 16px;
  width: 72px;
  height: 72px;
}

.completion-card h2 {
  margin: 0 0 8px;
  font-size: 2rem;
}

.completion-card p {
  margin: 0 0 22px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.completion-actions {
  display: grid;
  gap: 12px;
}

@media (max-width: 980px) {
  :root {
    --board-size: min(92vw, 620px);
  }

  .app-shell {
    padding: 18px;
  }

  .title-screen {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 20px;
  }

  .title-screen .brand {
    align-items: center;
    text-align: center;
  }

  .title-screen .brand h1 {
    font-size: clamp(4rem, 16vw, 7rem);
  }

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

  .topbar {
    display: grid;
  }

  .topbar-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .primary-button {
    grid-column: span 2;
  }

  .title-actions .primary-button,
  .completion-actions .primary-button {
    grid-column: auto;
  }

  .game-layout {
    display: grid;
  }

  .controls-section {
    width: min(var(--board-size), 100%);
    margin: 0 auto;
  }

  .number-pad {
    grid-template-columns: repeat(9, minmax(0, 1fr));
  }

  .number-button {
    min-height: 58px;
    font-size: 1.65rem;
  }

  .action-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .app-shell {
    width: 100%;
    min-height: 100vh;
    margin: 0;
    padding: 14px;
    border: 0;
    border-radius: 0;
  }

  .brand-mark {
    width: 46px;
    height: 46px;
    border-width: 3px;
    gap: 2px;
    padding: 5px;
  }

  .title-screen {
    gap: 20px;
    padding: 10px 0 0;
  }

  .title-screen .brand-mark {
    width: 62px;
    height: 62px;
  }

  .title-card,
  .settings-card,
  .completion-card {
    padding: 18px;
    border-radius: 18px;
  }

  .game-topbar {
    margin-bottom: 12px;
  }

  .icon-button {
    width: 50px;
    min-width: 50px;
    height: 50px;
  }

  .topbar {
    gap: 14px;
    margin-bottom: 14px;
  }

  .topbar-controls {
    gap: 9px;
  }

  .field,
  .timer-card,
  .primary-button {
    min-height: 50px;
    padding: 8px 11px;
  }

  select {
    width: 100%;
    font-size: 0.95rem;
  }

  .timer-card strong {
    font-size: 1.3rem;
  }

  .board {
    border-width: 2px;
    border-radius: 7px;
  }

  .cell {
    font-size: clamp(1.28rem, 7.4vw, 2.05rem);
  }

  .cell:nth-child(3n),
  .cell[data-row="2"],
  .cell[data-row="5"] {
    border-width: 2px;
  }

  .notes {
    font-size: clamp(0.42rem, 2.15vw, 0.62rem);
  }

  .status-strip {
    grid-template-columns: auto 1fr;
    padding: 12px;
    gap: 12px;
  }

  .status-icon {
    width: 44px;
    height: 44px;
  }

  .progress {
    grid-column: 1 / -1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-width: 0;
    padding: 10px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .number-pad {
    gap: 6px;
  }

  .number-button {
    min-height: 46px;
    border-radius: 10px;
    font-size: 1.35rem;
  }

  .action-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 9px;
  }

  .action-button {
    min-height: 58px;
    font-size: 0.9rem;
  }

  .action-button svg {
    width: 19px;
    height: 19px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}