*,
*::before,
*::after {
  box-sizing: border-box;
}

:root,
html.theme-light {
  --bg-body: #ffffff;
  --bg-header: #F8F0FF;
  --bg-panel: #F8F0FF;
  --bg-board: #EAE2F7;
  --bg-card: linear-gradient(145deg, rgba(255, 105, 180, 0.95) 0%, rgba(255, 20, 147, 0.95) 100%);
  --text-primary: #4a1942;
  --text-secondary: #5c3d5e;
  --text-heading: #800080;
  --text-muted: #6B21A8;
  --border-header: #e879f9;
  --border-panel: #f0abfc;
  --shadow-header: rgba(219, 39, 119, 0.2);
  --shadow-panel: rgba(219, 39, 119, 0.12);
  --input-bg: #fff;
  --bg-modal: #ffffff;
  --modal-text: #6B21A8;
}

html.theme-dark {
  --bg-body: #0f0a14;
  --bg-header: #1a1225;
  --bg-panel: #1a1225;
  --bg-board: #0f0a14;
  --bg-card: rgba(26, 18, 37, 0.95);
  --text-primary: #f5f0fa;
  --text-secondary: #d8b4fe;
  --text-heading: #e879f9;
  --text-muted: #c084fc;
  --border-header: #3b2a4a;
  --border-panel: #3b2a4a;
  --shadow-header: rgba(0, 0, 0, 0.4);
  --shadow-panel: rgba(0, 0, 0, 0.3);
  --input-bg: #2d2438;
  --bg-modal: #1a1225;
  --modal-text: #e9d5ff;
}

html {
  margin: 0;
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  font-family: "Nunito", "Segoe UI", system-ui, sans-serif;
  background: var(--bg-body);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease, color 0.3s ease;
}

.header {
  flex-shrink: 0;
  text-align: center;
  padding: 0.75rem 1.25rem 0.85rem;
  background: var(--bg-header);
  border-bottom: 3px solid var(--border-header);
  box-shadow: 0 4px 16px var(--shadow-header);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.header-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem 1rem;
  margin-bottom: 0.35rem;
}

.btn-ext {
  margin-left: auto;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  padding: 0.28rem 0.6rem;
  border-radius: 8px;
  position: relative;
  z-index: 1;
  background: linear-gradient(135deg, #8A2BE2 0%, #800080 100%);
  box-shadow: 0 2px 8px rgba(138, 43, 226, 0.4);
  transition: transform 0.2s, box-shadow 0.2s;
  overflow: hidden;
}

.btn-ext::before {
  content: "";
  position: absolute;
  inset: -3px;
  z-index: -2;
  border-radius: inherit;
  padding: 3px;
  background: conic-gradient(from 0deg, #e879f9, #f0abfc, #fbcfe8, #e879f9);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: ext-border-spin 2.5s linear infinite;
}

@keyframes ext-border-spin {
  to { transform: rotate(360deg); }
}

.btn-ext:hover,
.btn-ext:focus-visible {
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(138, 43, 226, 0.5);
}

.btn-ext.clicked {
  background: linear-gradient(135deg, #94a3b8 0%, #cbd5e1 100%);
  color: #64748b;
  box-shadow: none;
  cursor: default;
  transform: none;
}

.btn-ext.clicked::before {
  animation: none;
  background: transparent;
}

.btn-ext.clicked:hover,
.btn-ext.clicked:focus-visible {
  transform: none;
  box-shadow: none;
}

.btn-ext.link-highlight {
  z-index: 11;
  animation: link-pulse 1.5s ease-in-out infinite;
}
.btn-ext.link-highlight::before {
  animation: ext-border-spin 2.5s linear infinite;
}

@keyframes link-pulse {
  0%, 100% { box-shadow: 0 2px 10px rgba(255, 105, 180, 0.4), 0 0 0 0 rgba(219, 39, 119, 0.5); }
  50% { box-shadow: 0 4px 20px rgba(255, 105, 180, 0.6), 0 0 24px 4px rgba(219, 39, 119, 0.4); }
}

.link-wrap {
  margin-left: auto;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.2rem;
  position: relative;
  z-index: 10;
}

.redirect-hint {
  font-size: 0.7rem;
  color: var(--text-secondary, #64748b);
  font-weight: 500;
}
.redirect-hint.hidden {
  display: none !important;
}

.ext-link-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.2rem;
}
.ext-link-hint.hidden {
  display: none !important;
}

.overlay-modal {
  position: fixed;
  inset: 0;
  z-index: 9;
  background: rgba(15, 23, 42, 0.55);
  pointer-events: auto;
  transition: opacity 0.3s ease;
}
.overlay-modal.hidden {
  display: none !important;
}

.header h1 {
  margin: 0;
  font-size: clamp(1rem, 3vw, 1.35rem);
  font-weight: 800;
  color: var(--text-heading);
  text-shadow: 0 2px 4px rgba(255, 255, 255, 0.2);
  transition: color 0.3s ease;
}

html.theme-dark .header h1 {
  text-shadow: 0 0 20px rgba(232, 121, 249, 0.3);
}

.lang-toggle,
.theme-option {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.btn-theme-toggle {
  flex: 1;
  min-width: 0;
}

/* Light mode: button looks dark (invitation to switch to dark) */
html.theme-light .btn-theme-toggle {
  background: #504060;
  color: #fff;
  border: 2px solid #6B4E71;
}
html.theme-light .btn-theme-toggle:hover,
html.theme-light .btn-theme-toggle:focus-visible {
  background: #5c4a6a;
  border-color: #7d5a85;
}

/* Dark mode: when dark is ON, button looks clearly "active" and different */
html.theme-dark .btn-theme-toggle {
  background: var(--input-bg);
  color: var(--text-primary);
  border: 2px solid var(--border-panel);
}
html.theme-dark .btn-theme-toggle:hover,
html.theme-dark .btn-theme-toggle:focus-visible {
  background: #3d3550;
  border-color: #e879f9;
}
html.theme-dark .btn-theme-toggle.active {
  background: linear-gradient(135deg, #6B21A8 0%, #7e22ce 100%);
  color: #fff;
  border-color: #a78bfa;
  box-shadow: 0 0 12px rgba(167, 139, 250, 0.4);
}

.btn-lang {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  font-weight: 700;
  background: rgba(232, 121, 249, 0.2);
  color: #6B21A8;
  border: 3px solid #e879f9;
  border-radius: 999px;
  cursor: pointer;
}

.btn-lang:hover,
.btn-lang:focus-visible {
  background: rgba(232, 121, 249, 0.35);
  transform: scale(1.05);
}

.btn-lang.active {
  background: linear-gradient(135deg, #FF69B4 0%, #E91E8C 100%);
  color: #fff;
  border-color: #800080;
  box-shadow: 0 4px 14px rgba(255, 105, 180, 0.4);
}

.instruction {
  margin: 0.2rem 0 0;
  font-size: clamp(0.7rem, 1.8vw, 0.8rem);
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

.main {
  position: relative;
  flex: 1 1 auto;
  min-height: 80vh;
  width: 100%;
  padding: 1rem 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  overflow: visible;
}

.main-inner {
  flex: 1;
  min-height: 65vh;
  display: flex;
  flex-direction: row;
  gap: 1.5rem;
  overflow: hidden;
}

.game-center {
  flex: 1;
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.ad-slot {
  flex-shrink: 0;
  width: 160px;
  min-width: 120px;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #c8e6f5;
  transition: background 0.3s ease;
}

html.theme-dark .ad-slot {
  background: #1e293b;
}

.ad-slot-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: #64748b;
}

html.theme-dark .ad-slot-label {
  color: #94a3b8;
}

.ad-slot-bottom {
  width: 100%;
  min-width: 0;
  min-height: 90px;
  margin-top: 1rem;
  margin-bottom: 2rem;
  border-radius: 12px;
}

.options-panel {
  flex-shrink: 0;
  padding: 0.6rem 0 0;
  background: transparent;
  border: none;
  box-shadow: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-radius: 0;
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.options-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem 1.25rem;
}

.options-title {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: color 0.3s ease;
}

.header .options-panel .options-title {
  display: none;
}

.header .options-panel .controls {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  align-items: center;
}

.header .options-panel .controls label.control-label,
.header .options-panel .controls label {
  font-size: 0.75rem;
  margin: 0;
}

.header .options-panel .game-hud {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
  padding: 0;
}

.header .options-panel .hud-stat {
  font-size: 0.8rem;
}

.header .options-panel .progress-section {
  width: 100%;
  max-width: 280px;
}

.header .options-panel .progress-label {
  font-size: 0.7rem;
}

.header .options-panel .progress-bar-wrap,
.header .options-panel .pairs-progress-bar {
  height: 6px;
}

.header .options-panel .level-progress-bar,
.header .options-panel .pairs-progress-bar {
  height: 6px;
}

.mode-switcher {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.btn-mode {
  flex: 1;
  min-width: 0;
  padding: 0.28rem 0.4rem;
  font-size: 0.7rem;
  font-weight: 600;
  background: rgba(232, 121, 249, 0.12);
  color: var(--text-muted);
  border: 1px solid #e879f9;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, color 0.3s;
  white-space: nowrap;
  text-align: center;
  line-height: 1.2;
}

.btn-mode:hover,
.btn-mode:focus-visible {
  background: rgba(232, 121, 249, 0.2);
  transform: scale(1.02);
}

.btn-mode.active {
  background: linear-gradient(135deg, #FF69B4 0%, #E91E8C 100%);
  color: #fff;
  border-color: #800080;
}

.daily-progress-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  color: #059669;
  font-size: 0.9rem;
}

/* Daily mode: compact in header bar */
.options-panel:not(.practice-mode-view) .daily-progress-wrap {
  font-size: 0.9rem;
}

.options-panel:not(.practice-mode-view) .streak-display {
  font-size: 0.9rem;
}

.options-panel:not(.practice-mode-view) .streak-emoji {
  font-size: 0.85rem;
}

.streak-display {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 700;
  color: #ea580c;
  font-size: 0.95rem;
}

.streak-emoji {
  display: inline-block;
  animation: streak-fire 1.2s ease-in-out infinite;
}

@keyframes streak-fire {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.15); opacity: 0.9; }
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.controls label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

#set-select,
#level-select {
  padding: 0.3rem 0.5rem;
  font-size: 0.8rem;
  border: 2px solid #e879f9;
  border-radius: 6px;
  background: var(--input-bg, #fff);
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.3s ease, color 0.3s ease;
}

.level-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.level-row.hidden,
.daily-level-wrap.hidden,
.practice-level-strip.hidden {
  display: none !important;
}

/* Level circles (1–10) are for practice only; never show in daily mode */
.options-panel:not(.practice-mode-view) .practice-level-strip {
  display: none !important;
}

.practice-level-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  margin-top: 0.5rem;
}

.practice-level-btn {
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border-radius: 50%;
  border: 2px solid #e879f9;
  background: var(--input-bg, #fff);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.practice-level-btn:hover:not(:disabled) {
  background: #FF69B4;
  color: #fff;
  transform: scale(1.08);
}

.practice-level-btn.current {
  background: linear-gradient(135deg, #FF69B4 0%, #E91E8C 100%);
  color: #fff;
  border-color: #800080;
}

.practice-level-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  border-color: var(--border, #cbd5e1);
}

.daily-level-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

#daily-level-display {
  min-width: 3ch;
}

.btn {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover:not(:disabled),
.btn:focus-visible {
  transform: scale(1.04);
  box-shadow: 0 6px 20px rgba(255, 105, 180, 0.35);
}

.btn-primary {
  background: linear-gradient(135deg, #FF69B4 0%, #E91E8C 50%, #DB2777 100%);
  color: #fff;
  box-shadow: 0 4px 16px rgba(255, 105, 180, 0.35);
  border-radius: 999px;
  font-weight: 700;
}

.btn-secondary {
  background: rgba(232, 121, 249, 0.15);
  color: var(--text-muted);
  border: 2px solid #e879f9;
  transition: color 0.3s ease;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.game-hud {
  margin-top: 0.5rem;
  padding-top: 0.75rem;
  border-top: 2px solid rgba(232, 121, 249, 0.25);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  transition: color 0.3s ease;
}

/* Simplified options panel when daily mission is complete (score and time stay visible) */
.options-panel.daily-complete-view .progress-section {
  display: none;
}
.options-panel.daily-complete-view #level-label,
.options-panel.daily-complete-view #level-select-row {
  display: none;
}
.options-panel.daily-complete-view .game-hud {
  gap: 0.25rem;
  padding-top: 0.5rem;
}

/* Simplified options panel in practice mode (keep progress bar, score and time visible) */
.options-panel.practice-mode-view #level-label,
.options-panel.practice-mode-view #level-select-row {
  display: none;
}
.options-panel.practice-mode-view .game-hud {
  gap: 0.25rem;
  padding-top: 0.5rem;
}

/* Progress bar only: fade in from top when preview ends, fade out when round complete (score and time always visible) */
.options-panel .progress-section {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 0.45s ease, visibility 0.45s ease, transform 0.45s ease;
}
.options-panel.preview-active .progress-section {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-12px);
}
.options-panel.round-complete .progress-section {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-12px);
  transition: opacity 0.45s ease, visibility 0.45s ease, transform 0.45s ease;
}

.daily-progress-wrap.hidden {
  display: none;
}

.hud-title {
  font-size: clamp(0.85rem, 2vw, 1rem);
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  transition: color 0.3s ease;
}

#title-display {
  color: #800080;
}

.hud-time,
.hud-score {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
}

.hud-time #timer-text,
.hud-score #score-value {
  color: #E91E8C;
  font-weight: 800;
}

.progress-section {
  display: none !important;
}

.progress-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: #6B21A8;
  letter-spacing: 0.02em;
}

#progress-text {
  display: block;
  font-size: 0.8rem;
  color: #800080;
  letter-spacing: 0.02em;
}

.progress-bar-wrap {
  margin-bottom: 0.25rem;
}

.progress-bar {
  height: 0.5rem;
  border-radius: 999px;
  background: rgba(232, 121, 249, 0.2);
  border: 1px solid rgba(232, 121, 249, 0.3);
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.06);
}

.progress-bar.level-progress-bar {
  height: 0.5rem;
  background: linear-gradient(90deg, rgba(232, 121, 249, 0.25) 0%, rgba(255, 105, 180, 0.2) 100%);
  border-color: rgba(232, 121, 249, 0.35);
}

.level-progress-fill {
  background: linear-gradient(90deg, #FF69B4 0%, #E91E8C 50%, #DB2777 100%);
  box-shadow: 0 0 12px rgba(255, 105, 180, 0.4);
  transition: width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.pairs-progress-bar {
  height: 0.75rem;
  margin-top: 0.35rem;
  background: rgba(232, 121, 249, 0.2);
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  transition: width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.pairs-progress-fill {
  background: linear-gradient(90deg, #FF69B4 0%, #E91E8C 40%, #DB2777 100%);
  box-shadow: 0 0 14px rgba(255, 105, 180, 0.35);
  position: relative;
}

.pairs-progress-fill::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: linear-gradient(105deg, transparent 0%, rgba(255, 255, 255, 0.35) 50%, transparent 100%);
  pointer-events: none;
}

.game-board-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 2.5rem;
  background: var(--bg-board);
  transition: background 0.3s ease;
}

.game-green-box {
  position: relative;
  flex: 1;
  min-width: 0;
  min-height: 0;
  max-width: 100%;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #2ecc71;
  border-radius: 20px;
  padding: 4rem 5rem;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.06), 0 4px 24px rgba(0, 0, 0, 0.12);
}

.theme-dark .game-green-box {
  background: #27ae60;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08), 0 4px 24px rgba(0, 0, 0, 0.3);
}

.preview-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: rgba(15, 23, 42, 0.62);
  border-radius: 20px;
  margin: 1rem;
  z-index: 5;
  pointer-events: none;
  box-shadow: inset 0 0 100px rgba(0, 0, 0, 0.25);
  transition: background 0.3s ease;
}

.preview-overlay-msg {
  margin: 0;
  font-size: clamp(1.1rem, 4vw, 1.5rem);
  font-weight: 800;
  color: #fff;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
  letter-spacing: 0.02em;
}

.preview-overlay-count {
  margin: 0;
  font-size: clamp(3rem, 12vw, 5rem);
  font-weight: 900;
  color: #fff;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
  line-height: 1;
  animation: preview-pulse 1s ease-in-out infinite;
}

@keyframes preview-pulse {
  50% { transform: scale(1.1); }
}

.game-board-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 80%, rgba(240, 171, 252, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 80% 20%, rgba(255, 105, 180, 0.08) 0%, transparent 40%);
  pointer-events: none;
}

.game-green-box .game-area {
  max-width: 520px;
  max-height: 420px;
}

.game-area {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 0.5rem;
  aspect-ratio: 4 / 3;
  margin: auto;
}

.card {
  aspect-ratio: 1;
  min-height: 0;
  max-width: 100%;
  max-height: 100%;
  width: 100%;
  height: auto;
  perspective: 600px;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.card:hover:not(.matched) {
  transform: scale(1.03);
}

.card:hover:not(.matched) .card-back {
  box-shadow: 0 10px 28px rgba(255, 105, 180, 0.45);
}

html.theme-dark .card:hover:not(.matched) .card-back {
  box-shadow: 0 8px 24px rgba(71, 85, 105, 0.5);
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s ease;
  transform-style: preserve-3d;
}

.card.flipped .card-inner,
.card.matched .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: clamp(0.75rem, 2.5vw, 1.25rem);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.card-back {
  background: linear-gradient(145deg, #FF69B4 0%, #E91E8C 50%, #DB2777 100%);
  color: #fff;
  border: 4px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0 8px 24px rgba(255, 105, 180, 0.35);
}

html.theme-dark .card-back {
  background: linear-gradient(145deg, #2d1b4e 0%, #1e1533 100%);
  color: #fff;
  border: 2px solid rgba(139, 92, 246, 0.4);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.card-back::after {
  content: "?";
  font-size: 1.8em;
  opacity: 0.9;
}

.card-front {
  background: #fff;
  color: #1a1a2e;
  border: 3px solid #e879f9;
  transform: rotateY(180deg);
}

html.theme-dark .card-front {
  background: linear-gradient(145deg, #86efac 0%, #4ade80 100%);
  color: #14532d;
  border: 2px solid rgba(74, 222, 128, 0.8);
  box-shadow: 0 0 24px rgba(74, 222, 128, 0.5), 0 0 48px rgba(74, 222, 128, 0.2);
}

.card.matched .card-front {
  background: linear-gradient(145deg, #86efac 0%, #4ade80 100%);
  border-color: #22c55e;
  color: #166534;
  animation: match-shine 0.5s ease-out;
}

html.theme-dark .card.matched .card-front {
  background: linear-gradient(145deg, #86efac 0%, #4ade80 100%);
  border-color: #22c55e;
  color: #14532d;
  box-shadow: 0 0 28px rgba(74, 222, 128, 0.7), 0 0 56px rgba(74, 222, 128, 0.3);
}

@keyframes match-shine {
  0% { transform: rotateY(180deg) scale(1); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); }
  50% { transform: rotateY(180deg) scale(1.08); box-shadow: 0 0 20px rgba(34, 197, 94, 0.6); }
  100% { transform: rotateY(180deg) scale(1); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); }
}

.card.chinese .card-front {
  font-size: clamp(0.9rem, 3vw, 1.35rem);
  flex-direction: column;
  gap: 0.2em;
}

.card-emoji {
  display: block;
  font-size: 1.4em;
  line-height: 1;
}

.daily-limit-message {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  padding: 2.5rem 2rem;
  background: var(--bg-modal);
  border-radius: 20px;
  border: 3px solid #e879f9;
  text-align: center;
  z-index: 5;
  transition: background 0.3s ease;
}

.daily-limit-message.hidden {
  display: none !important;
}

.daily-limit-title {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.3;
  transition: color 0.3s ease;
}

.daily-limit-text {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--modal-text);
  line-height: 1.5;
  max-width: 32ch;
  transition: color 0.3s ease;
}

.daily-limit-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.hidden {
  display: none !important;
}

.win-message,
.timeup-message {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  text-align: center;
  padding: 1.75rem 2rem;
  max-width: min(90vw, 420px);
  width: 100%;
  box-sizing: border-box;
}

.win-message {
  background: var(--bg-modal);
  border-radius: 24px;
  border: 4px solid #22c55e;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.18), 0 0 0 2px rgba(34, 197, 94, 0.3);
  transition: background 0.3s ease;
}

.win-message p {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--modal-text);
  transition: color 0.3s ease;
}

.win-stats {
  margin: 1rem 0;
  font-size: 1.1rem;
  color: var(--modal-text);
  transition: color 0.3s ease;
}

.win-stars {
  display: flex;
  justify-content: center;
  gap: 0.35em;
  margin: 0 0 0.5rem;
  font-size: 2.5rem;
  line-height: 1;
}

.win-star {
  display: inline-block;
  transform: scale(0);
  opacity: 0;
  animation: star-pop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.win-star-filled {
  color: #fbbf24;
  text-shadow: 0 0 12px rgba(251, 191, 36, 0.5);
}

.win-star-empty {
  color: rgba(255, 105, 180, 0.25);
  animation-name: star-pop-subtle;
}

@keyframes star-pop {
  0% { transform: scale(0); opacity: 0; }
  60% { transform: scale(1.25); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes star-pop-subtle {
  0% { transform: scale(0); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.win-stats p {
  margin: 0.25rem 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.win-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 1rem;
}

.win-message .btn {
  margin: 0;
}

.timeup-message {
  border: 4px solid #e879f9;
  border-radius: 24px;
  background: var(--bg-modal, #ffffff);
  box-shadow: 0 20px 60px rgba(255, 105, 180, 0.2);
}

.timeup-message p {
  color: #6B21A8;
}

.timeup-hint {
  font-size: 0.95rem !important;
  font-weight: 600 !important;
  color: #800080 !important;
  margin: 0.5rem 0 1rem !important;
}

/* Scrollable “About / How to play” section below the game */
.page-content {
  width: 100%;
  max-width: 720px;
  margin: 3rem auto 4rem;
  padding: 0 1.5rem;
}

.page-content-inner {
  padding: 2rem 0;
  border-top: 2px solid var(--border-panel);
}

.page-content-title {
  margin: 0 0 1.25rem;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-heading);
  transition: color 0.3s ease;
}

.page-content-subtitle {
  margin: 1.5rem 0 0.6rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: color 0.3s ease;
}

.page-content-para {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

.page-content-para + .page-content-subtitle {
  margin-top: 1.75rem;
}

.page-content-about-title {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-panel);
}

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

.confetti-piece {
  position: absolute;
  top: -10px;
  border-radius: 2px;
  pointer-events: none;
  animation: confetti-fall 2.5s ease-out forwards;
}

@keyframes confetti-fall {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

.daily-complete-celebration {
  position: fixed;
  inset: 0;
  z-index: 25;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease-out;
}

.daily-complete-celebration.visible {
  opacity: 1;
}

.daily-complete-celebration.hidden {
  display: none !important;
}

.daily-complete-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
}

.daily-complete-streak-reveal {
  position: relative;
  z-index: 1;
  text-align: center;
  transform: scale(0.3);
  opacity: 0;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease-out;
}

.daily-complete-streak-reveal.revealed {
  transform: scale(1);
  opacity: 1;
}

.daily-complete-streak-label {
  margin: 0 0 0.25rem 0;
  font-size: 1rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.daily-complete-streak-value {
  margin: 0;
  font-size: 3rem;
  font-weight: 800;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
}

.daily-complete-emoji {
  display: inline-block;
  animation: streak-fire 1.2s ease-in-out infinite;
}

@media (max-width: 600px) {
  .main-inner {
    flex-direction: column;
  }
  .ad-slot {
    width: 100%;
    min-width: 0;
    min-height: 48px;
  }
  .ad-slot-left {
    order: 2;
  }
  .ad-slot-right {
    order: 3;
  }
  .game-center {
    order: 1;
  }
}

@media (min-width: 500px) {
  .game-area {
    grid-template-columns: repeat(4, 1fr);
  }
}