:root {
  --ink: #1f2a2e;
  --muted: #677579;
  --paper: #fffaf1;
  --panel: rgba(255, 250, 241, 0.88);
  --line: rgba(31, 42, 46, 0.14);
  --shadow: 0 24px 70px rgba(50, 33, 17, 0.2);
  --accent: #e86f51;
  --teal: #157f83;
  --gold: #e7b84d;
  --board-size: min(68vmin, 560px);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(120deg, rgba(255, 249, 232, 0.78), rgba(225, 244, 239, 0.7)),
    url("assets/cozy-game-bg.png") center / cover fixed;
}

button {
  border: 0;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 12;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 10px max(16px, calc((100vw - 1180px) / 2));
  background: rgba(255, 250, 241, 0.82);
  border-bottom: 1px solid rgba(31, 42, 46, 0.1);
  backdrop-filter: blur(16px);
}

.site-brand,
.site-nav,
.site-footer nav {
  display: flex;
  align-items: center;
}

.site-brand {
  gap: 10px;
  font-weight: 950;
  text-decoration: none;
}

.site-nav {
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav a,
.site-footer a,
.text-link {
  font-weight: 850;
  text-decoration: none;
}

.site-nav a {
  padding: 8px 10px;
  border-radius: 999px;
}

.site-nav a:hover,
.text-link:hover,
.site-footer a:hover {
  color: var(--teal);
}

.app-shell {
  min-height: calc(100vh - 68px);
  padding: 10px 12px 18px;
  display: grid;
  place-items: center;
}

.game-stage {
  width: min(1180px, 100%);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 22px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.42);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.topbar,
.layout,
.board-header,
.brand,
.pill-row,
.controls,
.modal-actions {
  display: flex;
}

.topbar {
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  margin-bottom: 12px;
}

.brand {
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 46px;
  height: 46px;
  object-fit: contain;
  filter: drop-shadow(0 10px 12px rgba(64, 38, 14, 0.2));
}

.eyebrow,
.panel-label {
  margin: 0 0 4px;
  color: #7f614a;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.8rem, 3.8vw, 3.1rem);
  line-height: 0.92;
}

h2 {
  margin-bottom: 8px;
}

.pill-row {
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.stat-pill,
.assist-toggle {
  min-height: 36px;
  display: inline-grid;
  place-items: center;
  padding: 0 13px;
  border: 1px solid rgba(31, 42, 46, 0.1);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  font-weight: 800;
  box-shadow: 0 8px 16px rgba(68, 46, 28, 0.08);
}

.heart-pill {
  min-width: 110px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  white-space: nowrap;
}

.heart {
  width: 22px;
  height: 22px;
  display: inline-grid;
  place-items: center;
  flex: 0 0 22px;
  color: #e74a5c;
  font-size: 1.28rem;
  line-height: 1;
  filter: drop-shadow(0 4px 4px rgba(154, 25, 47, 0.18));
}

.heart::before {
  content: "♥";
}

.heart.empty {
  filter: none;
}

.heart.empty::before {
  content: "♡";
  font-weight: 900;
}

.layout {
  align-items: stretch;
  gap: 12px;
}

.side-panel,
.board-wrap {
  border: 1px solid rgba(255, 255, 255, 0.68);
  border-radius: 20px;
  background: var(--panel);
}

.side-panel {
  width: 248px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.level-card,
.rule-card,
.cat-counter-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.56);
}

.cat-counter {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 9px;
  padding: 2px;
}

.cat-slot {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.66) url("assets/cat-token.png") center / 120% no-repeat;
  box-shadow: inset 0 0 0 1px rgba(31, 42, 46, 0.1), 0 7px 12px rgba(68, 46, 28, 0.1);
  transition: opacity 180ms ease, transform 180ms ease;
}

.cat-slot.used {
  opacity: 0.22;
  transform: scale(0.82);
  background-image: none;
}

.progress-track {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(31, 42, 46, 0.09);
}

.progress-track span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--gold), var(--accent));
  transition: width 240ms ease;
}

.controls {
  display: block;
}

.placement-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.language-control {
  display: grid;
  gap: 3px;
}

.header-language {
  justify-self: end;
  min-width: 176px;
}

.language-control .panel-label {
  margin: 0;
}

.language-control select {
  width: 100%;
  height: 36px;
  border: 0;
  border-radius: 999px;
  padding: 0 34px 0 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.74);
  box-shadow: inset 0 0 0 1px rgba(31, 42, 46, 0.1), 0 8px 16px rgba(68, 46, 28, 0.08);
  font: inherit;
  font-weight: 850;
}

.seo-hero {
  padding: 68px max(18px, calc((100vw - 1120px) / 2)) 48px;
  background:
    linear-gradient(120deg, rgba(255, 250, 241, 0.94), rgba(225, 244, 239, 0.86)),
    url("assets/cozy-game-bg.png") center / cover;
}

.seo-hero-inner {
  max-width: 860px;
}

.seo-hero h1 {
  max-width: 760px;
  margin-bottom: 18px;
  font-size: clamp(2.4rem, 6vw, 4.8rem);
  line-height: 0.96;
}

.seo-lede {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.14rem;
  line-height: 1.7;
}

.seo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.seo-button {
  display: inline-grid;
  min-height: 42px;
  place-items: center;
  padding: 0 16px;
  border-radius: 999px;
  background: #243438;
  color: #fff;
  font-weight: 900;
  text-decoration: none;
  box-shadow: 0 12px 24px rgba(36, 52, 56, 0.2);
}

.seo-button.secondary {
  background: rgba(255, 255, 255, 0.78);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px rgba(31, 42, 46, 0.12), 0 10px 20px rgba(68, 46, 28, 0.08);
}

.difficulty-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  max-width: 420px;
  margin: 0 auto 10px;
  padding: 5px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.64);
  box-shadow: inset 0 0 0 1px rgba(31, 42, 46, 0.1), 0 10px 18px rgba(68, 46, 28, 0.08);
}

.difficulty-tabs button {
  min-height: 34px;
  border-radius: 13px;
  background: transparent;
  color: var(--muted);
  font-weight: 950;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.difficulty-tabs button.active {
  color: #fff;
  background: #243438;
  box-shadow: 0 8px 16px rgba(36, 52, 56, 0.22);
}

.difficulty-tabs button:hover {
  transform: translateY(-1px);
}

.mode-button,
.assist-toggle,
.tool-grid button,
.modal-actions button {
  min-height: 38px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.74);
  font-weight: 900;
  box-shadow: inset 0 0 0 1px rgba(31, 42, 46, 0.1), 0 8px 16px rgba(68, 46, 28, 0.08);
  transition: transform 140ms ease, background 140ms ease, box-shadow 140ms ease;
}

.mode-button {
  flex: 1;
}

.mode-button.active {
  color: #fff;
  background: #243438;
}

.assist-toggle {
  white-space: nowrap;
}

.assist-toggle.active {
  color: #fff;
  background: var(--teal);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.tool-grid button:hover,
.mode-button:hover,
.assist-toggle:hover,
.modal-actions button:hover {
  transform: translateY(-1px);
}

.rule-card ul {
  margin: 8px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.5;
}

.board-wrap {
  flex: 1;
  padding: 12px;
  min-width: 0;
}

.board-header {
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 8px;
}

.board {
  width: min(var(--board-size), 100%);
  aspect-ratio: 1;
  display: grid;
  margin: 0 auto;
  border: 5px solid rgba(31, 42, 46, 0.82);
  border-radius: 18px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.68);
  box-shadow: 0 18px 36px rgba(43, 32, 18, 0.18);
  touch-action: manipulation;
}

.board.celebrate {
  animation: boardWin 820ms cubic-bezier(.2, 1.4, .34, 1);
}

.cell {
  position: relative;
  display: grid;
  place-items: center;
  border-right: 1px solid rgba(31, 42, 46, 0.17);
  border-bottom: 1px solid rgba(31, 42, 46, 0.17);
  outline: 0;
  background: var(--room-color);
  transition: filter 160ms ease, transform 160ms ease;
}

.cell:nth-child(1n) {
  min-width: 0;
}

.cell:hover,
.cell:focus-visible {
  filter: brightness(1.06) saturate(1.07);
  z-index: 2;
}

.cell.blocked::after {
  content: "";
  width: 34%;
  height: 34%;
  border-radius: 50%;
  background: rgba(31, 42, 46, 0.22);
}

.cell.marked::after {
  content: "";
  width: 30%;
  height: 30%;
  border-radius: 50%;
  background: #243438;
  box-shadow: 0 0 0 5px rgba(255, 255, 255, 0.34);
}

.cell.assist-mark::after {
  content: "";
  width: 24%;
  height: 24%;
  border-radius: 50%;
  background: rgba(31, 42, 46, 0.35);
}

.cell.cat::before {
  content: "";
  width: 104%;
  height: 104%;
  display: block;
  background: url("assets/cat-token.png") center / contain no-repeat;
  filter: drop-shadow(0 10px 10px rgba(49, 28, 10, 0.24));
  animation: pop 210ms cubic-bezier(.2, 1.7, .4, 1);
}

.cell.hint {
  box-shadow: inset 0 0 0 5px rgba(255, 255, 255, 0.88), inset 0 0 0 9px rgba(232, 111, 81, 0.8);
}

.cell.error {
  animation: shake 280ms ease;
}

.icon-cat,
.icon-dot {
  display: inline-block;
  vertical-align: -3px;
  margin-right: 7px;
}

.icon-dot.hollow {
  background: transparent;
  box-shadow: inset 0 0 0 2px currentColor;
}

.icon-cat {
  width: 18px;
  height: 18px;
  background: url("assets/cat-token.png") center / contain no-repeat;
}

.icon-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: currentColor;
}

.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(26, 33, 34, 0.42);
  backdrop-filter: blur(8px);
}

.modal.hidden {
  display: none;
}

.modal-card {
  width: min(420px, 100%);
  padding: 22px;
  border-radius: 24px;
  background: var(--paper);
  text-align: center;
  box-shadow: var(--shadow);
  animation: modalPop 520ms cubic-bezier(.2, 1.5, .35, 1);
}

.victory-art {
  width: 100%;
  max-height: 210px;
  object-fit: contain;
  margin-bottom: 8px;
}

.modal-actions {
  gap: 10px;
}

.modal-actions button {
  flex: 1;
  padding: 0 12px;
}

.modal-actions button:first-child {
  color: #fff;
  background: var(--teal);
}

@keyframes pop {
  from { transform: scale(0.3) rotate(-8deg); opacity: 0; }
  to { transform: scale(1) rotate(0); opacity: 1; }
}

@keyframes shake {
  20% { transform: translateX(-5px); }
  45% { transform: translateX(5px); }
  70% { transform: translateX(-3px); }
}

.celebration-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 20;
}

.spark {
  position: absolute;
  width: 12px;
  height: 18px;
  border-radius: 4px;
  background: var(--spark-color);
  left: var(--x);
  top: -26px;
  transform: rotate(var(--r));
  animation: confettiFall var(--d) cubic-bezier(.16, .7, .24, 1) forwards;
}

.spark.cat-spark {
  width: 38px;
  height: 38px;
  border-radius: 0;
  background: url("assets/cat-token.png") center / contain no-repeat;
  filter: drop-shadow(0 8px 8px rgba(49, 28, 10, 0.2));
}

@keyframes boardWin {
  0% { transform: scale(1); filter: saturate(1); }
  32% { transform: scale(1.035) rotate(-0.8deg); filter: saturate(1.25) brightness(1.06); }
  62% { transform: scale(1.02) rotate(0.8deg); }
  100% { transform: scale(1); filter: saturate(1); }
}

@keyframes modalPop {
  from { opacity: 0; transform: translateY(24px) scale(0.86); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes confettiFall {
  0% { opacity: 0; transform: translateY(-30px) rotate(var(--r)) scale(0.9); }
  8% { opacity: 1; }
  100% { opacity: 0; transform: translateY(112vh) translateX(var(--drift)) rotate(calc(var(--turns) * 1deg)) scale(1); }
}

.seo-section {
  padding: 54px max(18px, calc((100vw - 1100px) / 2));
  background: rgba(255, 250, 241, 0.88);
}

.seo-section.alt {
  background: rgba(225, 244, 239, 0.78);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.6fr);
  gap: 28px;
  align-items: start;
}

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

.seo-section h2 {
  font-size: clamp(1.7rem, 3vw, 2.5rem);
}

.seo-section p,
.seo-section li,
.site-footer p {
  color: var(--muted);
  line-height: 1.65;
}

.seo-card,
.content-grid.three article {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: 0 12px 28px rgba(68, 46, 28, 0.08);
}

.seo-card h2,
.seo-card h3,
.content-grid article h2,
.content-grid article h3 {
  line-height: 1.12;
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.answer-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.66);
}

.answer-card p:last-child,
.seo-card p:last-child,
.content-grid article p:last-child {
  margin-bottom: 0;
}

.keyword-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.keyword-cloud a,
.keyword-cloud span {
  padding: 8px 11px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 850;
  text-decoration: none;
  box-shadow: inset 0 0 0 1px rgba(31, 42, 46, 0.1);
}

.text-link {
  color: var(--teal);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  padding: 34px max(18px, calc((100vw - 1100px) / 2));
  color: var(--ink);
  background: #fffaf1;
  border-top: 1px solid rgba(31, 42, 46, 0.1);
}

.site-footer nav {
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.footer-mark {
  width: 36px;
  height: 36px;
  margin-right: 8px;
  vertical-align: middle;
  object-fit: contain;
}

@media (max-width: 860px) {
  .app-shell {
    padding: 8px;
  }

  .game-stage {
    padding: 10px;
    border-radius: 18px;
  }

  .topbar,
  .layout {
    flex-direction: column;
  }

  .site-header,
  .site-footer {
    grid-template-columns: 1fr;
    align-items: flex-start;
  }

  .header-language {
    justify-self: start;
  }

  .content-grid,
  .content-grid.three {
    grid-template-columns: 1fr;
  }

  .topbar {
    align-items: stretch;
  }

  .pill-row {
    justify-content: flex-start;
  }

  .side-panel {
    width: 100%;
  }

  .side-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .rule-card {
    grid-column: 1 / -1;
  }

  .board {
    --board-size: min(92vw, 560px);
    border-width: 4px;
    border-radius: 14px;
  }
}

@media (max-width: 540px) {
  .site-header {
    position: static;
  }

  .site-nav {
    font-size: 0.9rem;
    justify-content: flex-start;
  }

  .answer-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2rem;
  }

  .brand-mark {
    width: 48px;
    height: 48px;
    border-radius: 14px;
  }

  .side-panel {
    grid-template-columns: 1fr;
  }

  .rule-card {
    display: none;
  }

  .language-control {
    width: min(100%, 190px);
  }

  .board-wrap {
    padding: 12px;
  }

  .board-header {
    align-items: flex-start;
  }

  #statusText {
    font-size: 1.05rem;
  }

  .seo-section {
    padding-block: 38px;
  }
}