@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&family=Fredoka+One&display=swap');

/* =============================================
   ROOT VARIABLES — scoped to container
   ============================================= */
#basicMathRoot {
  --bg1: #0f0c29; --bg2: #302b63; --bg3: #24243e;
  --primary: #f7971e; --secondary: #ffd200;
  --accent: #21d4fd; --accent2: #b721ff;
  --green: #56ab2f; --green2: #a8e063;
  --red: #f7263f; --pink: #ff6fd8;
  --card: rgba(255,255,255,0.08);
  --glass: rgba(255,255,255,0.12);
  --border: rgba(255,255,255,0.18);
  --text: #ffffff; --text2: rgba(255,255,255,0.7);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --glow: 0 0 20px rgba(247,151,30,0.5);
  --radius: 18px; --radius-sm: 12px;
}

/* =============================================
   GAME ROOT CONTAINER
   ============================================= */
#basicMathRoot {
  width: 100% !important;
  height: 620px !important;
  min-height: 620px !important;
  max-height: 620px !important;
  position: relative !important;
  overflow: hidden !important;
  font-family: 'Nunito', sans-serif !important;
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e) !important;
  color: #ffffff !important;
  display: flex !important;
  flex-direction: column !important;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  box-sizing: border-box !important;
  padding: 0 !important;
  margin: 0 !important;
}

#basicMathRoot *, #basicMathRoot *::before, #basicMathRoot *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

/* =============================================
   SCREENS
   ============================================= */
#basicMathRoot .bm-screen {
  position: absolute !important;
  top: 0 !important; left: 0 !important; right: 0 !important; bottom: 0 !important;
  display: none;
  flex-direction: column;
  align-items: center;
  overflow-y: auto !important;
  overflow-x: hidden !important;
  padding-bottom: 80px;
  width: 100% !important;
  height: 100% !important;
}
#basicMathRoot .bm-screen.active { display: flex !important; }

#basicMathRoot .bm-screen::-webkit-scrollbar { width: 6px; }
#basicMathRoot .bm-screen::-webkit-scrollbar-track { background: transparent; }
#basicMathRoot .bm-screen::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 3px; }

/* =============================================
   START SCREEN
   ============================================= */
#basicMathRoot #bm-startScreen {
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
}
#basicMathRoot .bm-start-content {
  text-align: center;
  padding: 40px 30px;
  z-index: 2;
  position: relative;
}
#basicMathRoot .bm-start-logo {
  font-size: 5rem;
  margin-bottom: 20px;
  animation: bm-logoBounce 2s ease-in-out infinite;
}
@keyframes bm-logoBounce {
  0%,100% { transform: translateY(0) rotate(-5deg); }
  50%      { transform: translateY(-15px) rotate(5deg); }
}
#basicMathRoot .bm-start-title {
  font-family: 'Fredoka One', cursive;
  font-size: 3rem;
  line-height: 1.3;
  padding: 4px 8px;
  display: inline-block;
  background: linear-gradient(90deg, #f7971e, #ffd200, #21d4fd);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
#basicMathRoot .bm-start-sub {
  color: var(--text2);
  font-size: 1.1rem;
  margin-bottom: 40px;
}
#basicMathRoot .bm-start-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  border-radius: 20px;
  padding: 18px 50px;
  font-family: 'Fredoka One', cursive;
  font-size: 1.6rem;
  color: #1a1a1a;
  cursor: pointer;
  box-shadow: 0 8px 30px rgba(247,151,30,0.5);
  transition: all 0.3s;
  display: block;
  margin: 0 auto;
}
#basicMathRoot .bm-start-btn:hover  { transform: scale(1.05) translateY(-3px); box-shadow: 0 12px 40px rgba(247,151,30,0.7); }
#basicMathRoot .bm-start-btn:active { transform: scale(0.97); }

/* Floating emojis — contained */
#basicMathRoot .bm-floating-emoji {
  position: absolute;
  font-size: 2rem;
  animation: bm-floatAround linear infinite;
  pointer-events: none;
  opacity: 0.4;
}
@keyframes bm-floatAround {
  0%   { transform: translateY(0) rotate(0deg); }
  100% { transform: translateY(-700px) rotate(360deg); }
}

/* =============================================
   HOME SCREEN
   ============================================= */
#basicMathRoot #bm-homeScreen {
  justify-content: flex-start;
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
}
#basicMathRoot .bm-home-header {
  text-align: center;
  padding: 40px 20px 20px;
  width: 100%;
}
#basicMathRoot .bm-home-title {
  font-family: 'Fredoka One', cursive;
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  line-height: 1.3;
  padding: 4px 8px;
  display: inline-block;
  background: linear-gradient(90deg, #f7971e, #ffd200, #21d4fd, #b721ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: bm-titlePulse 3s ease-in-out infinite;
}
@keyframes bm-titlePulse {
  0%,100% { opacity: 1; }
  50%      { opacity: 0.85; }
}
#basicMathRoot .bm-home-subtitle { font-size: 1.1rem; color: var(--text2); margin-top: 8px; font-weight: 600; }
#basicMathRoot .bm-stars-display  { display: flex; gap: 8px; justify-content: center; margin-top: 12px; }
#basicMathRoot .bm-star-icon       { font-size: 1.8rem; animation: bm-starSpin 4s linear infinite; }
@keyframes bm-starSpin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

#basicMathRoot .bm-stats-bar {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 12px 20px;
  width: 100%;
}
#basicMathRoot .bm-stat-chip {
  background: var(--glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
  border-radius: 50px;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

#basicMathRoot .bm-modes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
  padding: 16px 20px;
  width: 100%;
  max-width: 700px;
}
#basicMathRoot .bm-mode-card {
  background: var(--card);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: 20px 12px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
#basicMathRoot .bm-mode-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(255,255,255,0.05));
  opacity: 0;
  transition: opacity 0.3s;
}
#basicMathRoot .bm-mode-card:hover::before,
#basicMathRoot .bm-mode-card:active::before { opacity: 1; }
#basicMathRoot .bm-mode-card:hover  { transform: translateY(-4px) scale(1.03); box-shadow: var(--shadow); }
#basicMathRoot .bm-mode-card:active { transform: scale(0.97); }
#basicMathRoot .bm-mode-icon          { font-size: 2.5rem; margin-bottom: 10px; display: block; }
#basicMathRoot .bm-mode-name          { font-weight: 800; font-size: 0.85rem; margin-bottom: 6px; }
#basicMathRoot .bm-mode-progress      { font-size: 0.75rem; color: var(--text2); }
#basicMathRoot .bm-mode-progress-bar  { height: 4px; background: rgba(255,255,255,0.15); border-radius: 10px; margin-top: 8px; overflow: hidden; }
#basicMathRoot .bm-mode-progress-fill { height: 100%; border-radius: 10px; transition: width 0.5s ease; }

/* =============================================
   LEVEL SELECT SCREEN
   ============================================= */
#basicMathRoot #bm-levelScreen { background: inherit; }
#basicMathRoot .bm-level-header {
  width: 100%;
  padding: 20px 20px 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}
#basicMathRoot .bm-back-btn {
  background: var(--glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
  border-radius: 12px;
  padding: 10px 16px;
  cursor: pointer;
  font-size: 1.2rem;
  transition: all 0.2s;
  color: var(--text);
}
#basicMathRoot .bm-back-btn:hover { background: rgba(255,255,255,0.2); transform: scale(1.05); }
#basicMathRoot .bm-level-title { font-family: 'Fredoka One', cursive; font-size: 1.8rem; }

#basicMathRoot .bm-levels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
  gap: 10px;
  padding: 10px 20px;
  width: 100%;
  max-width: 700px;
}
#basicMathRoot .bm-level-btn {
  aspect-ratio: 1;
  border-radius: 14px;
  border: none;
  font-family: 'Fredoka One', cursive;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.25s;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  position: relative;
  overflow: hidden;
}
#basicMathRoot .bm-level-btn.locked    { background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.3); cursor: not-allowed; }
#basicMathRoot .bm-level-btn.unlocked  { background: var(--glass); border: 1px solid var(--border); color: var(--text); }
#basicMathRoot .bm-level-btn.unlocked:hover { transform: scale(1.08); box-shadow: 0 4px 20px rgba(247,151,30,0.4); }
#basicMathRoot .bm-level-btn.completed { background: linear-gradient(135deg, var(--green), var(--green2)); color: #fff; box-shadow: 0 4px 15px rgba(86,171,47,0.5); }
#basicMathRoot .bm-level-stars         { font-size: 0.5rem; letter-spacing: 1px; }

/* =============================================
   GAME SCREEN
   ============================================= */
#basicMathRoot #bm-gameScreen {
  justify-content: flex-start;
  background: linear-gradient(135deg, var(--bg1), var(--bg2), var(--bg3));
}
#basicMathRoot .bm-game-topbar {
  width: 100%;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0,0,0,0.2);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
#basicMathRoot .bm-game-info { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
#basicMathRoot .bm-info-chip {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 4px;
}

#basicMathRoot .bm-progress-wrap  { width: 100%; padding: 10px 16px; flex-shrink: 0; }
#basicMathRoot .bm-progress-track { height: 8px; background: rgba(255,255,255,0.1); border-radius: 10px; overflow: hidden; }
#basicMathRoot .bm-progress-fill  { height: 100%; border-radius: 10px; background: linear-gradient(90deg, var(--primary), var(--secondary)); transition: width 0.5s ease; }

#basicMathRoot .bm-question-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px 16px;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  overflow-y: auto;
}
#basicMathRoot .bm-question-card {
  background: var(--glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 28px 24px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow);
  animation: bm-cardIn 0.4s ease;
}
@keyframes bm-cardIn {
  from { opacity: 0; transform: translateY(20px) scale(0.95); }
  to   { opacity: 1; transform: none; }
}
#basicMathRoot .bm-question-label {
  font-size: 0.85rem;
  color: var(--text2);
  margin-bottom: 8px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}
#basicMathRoot .bm-question-text {
  font-family: 'Fredoka One', cursive;
  font-size: clamp(1.6rem, 6vw, 3rem);
  line-height: 1.4;
  padding: 4px 8px;
  display: block;
  margin-bottom: 20px;
  background: linear-gradient(90deg, #f7971e, #ffd200);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* =============================================
   ANSWER OPTIONS
   ============================================= */
#basicMathRoot .bm-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 100%;
  max-width: 440px;
  margin: 0 auto;
}
#basicMathRoot .bm-option-btn {
  background: var(--glass);
  border: 2px solid var(--border);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 18px 12px;
  font-family: 'Fredoka One', cursive;
  font-size: 1.3rem;
  color: var(--text);
  cursor: pointer;
  transition: all 0.25s;
  text-align: center;
  line-height: 1.2;
}
#basicMathRoot .bm-option-btn:hover  { transform: scale(1.05); border-color: var(--primary); box-shadow: 0 0 20px rgba(247,151,30,0.4); }
#basicMathRoot .bm-option-btn:active { transform: scale(0.97); }
#basicMathRoot .bm-option-btn.correct { background: linear-gradient(135deg, #56ab2f, #a8e063); border-color: #56ab2f; animation: bm-correctPulse 0.5s ease; }
#basicMathRoot .bm-option-btn.wrong   { background: linear-gradient(135deg, #f7263f, #ff6b6b); border-color: #f7263f; animation: bm-wrongShake 0.4s ease; }
@keyframes bm-correctPulse { 0%{transform:scale(1)} 50%{transform:scale(1.1)} 100%{transform:scale(1)} }
@keyframes bm-wrongShake   { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-8px)} 75%{transform:translateX(8px)} }

/* =============================================
   INPUT ANSWER
   ============================================= */
#basicMathRoot .bm-input-answer-wrap {
  display: flex;
  gap: 10px;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}
#basicMathRoot .bm-answer-input {
  flex: 1;
  background: var(--glass);
  border: 2px solid var(--border);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 16px 20px;
  font-family: 'Fredoka One', cursive;
  font-size: 1.6rem;
  color: var(--text);
  text-align: center;
  outline: none;
  transition: border-color 0.3s;
}
#basicMathRoot .bm-answer-input:focus       { border-color: var(--primary); box-shadow: 0 0 20px rgba(247,151,30,0.3); }
#basicMathRoot .bm-answer-input::placeholder { color: rgba(255,255,255,0.3); }
#basicMathRoot .bm-submit-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  border-radius: 16px;
  padding: 16px 20px;
  font-size: 1.4rem;
  cursor: pointer;
  transition: all 0.25s;
}
#basicMathRoot .bm-submit-btn:hover  { transform: scale(1.08); box-shadow: var(--glow); }
#basicMathRoot .bm-submit-btn:active { transform: scale(0.95); }

/* =============================================
   DRAG & DROP
   ============================================= */
#basicMathRoot .bm-drag-options { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; margin-top: 16px; }
#basicMathRoot .bm-drag-item {
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  border-radius: 12px;
  padding: 14px 20px;
  font-family: 'Fredoka One', cursive;
  font-size: 1.3rem;
  cursor: grab;
  transition: all 0.25s;
  user-select: none;
  box-shadow: 0 4px 15px rgba(183,33,255,0.4);
}
#basicMathRoot .bm-drag-item:active { cursor: grabbing; transform: scale(1.1) rotate(3deg); }
#basicMathRoot .bm-drop-zone {
  min-width: 120px;
  min-height: 60px;
  border: 3px dashed var(--border);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  font-family: 'Fredoka One', cursive;
  transition: all 0.3s;
  margin: 16px auto;
}
#basicMathRoot .bm-drop-zone.drag-over { border-color: var(--primary); background: rgba(247,151,30,0.1); }
#basicMathRoot .bm-drop-zone.filled    { border-style: solid; border-color: var(--green); background: rgba(86,171,47,0.15); }

/* =============================================
   SHAPE / OBJECT COUNTING
   ============================================= */
#basicMathRoot .bm-shapes-area {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  padding: 16px;
  background: rgba(0,0,0,0.1);
  border-radius: 16px;
  margin-bottom: 20px;
  max-height: 160px;
  overflow-y: auto;
}
#basicMathRoot .bm-shape-item { font-size: 2rem; animation: bm-shapeBounce 2s ease-in-out infinite; }
@keyframes bm-shapeBounce { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-5px); } }

/* =============================================
   NUMBER MATCHING
   ============================================= */
#basicMathRoot .bm-matching-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; width: 100%; max-width: 440px; }
#basicMathRoot .bm-match-col     { display: flex; flex-direction: column; gap: 8px; }
#basicMathRoot .bm-match-item {
  background: var(--glass);
  border: 2px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  text-align: center;
  font-family: 'Fredoka One', cursive;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.25s;
  word-break: break-all;
}
#basicMathRoot .bm-match-item:hover       { border-color: var(--primary); }
#basicMathRoot .bm-match-item.selected    { border-color: var(--accent); background: rgba(33,212,253,0.2); }
#basicMathRoot .bm-match-item.matched     { border-color: var(--green); background: rgba(86,171,47,0.2); pointer-events: none; }
#basicMathRoot .bm-match-item.wrong-match { border-color: var(--red); background: rgba(247,38,63,0.2); animation: bm-wrongShake 0.4s ease; }

/* =============================================
   FEEDBACK OVERLAY — absolute inside container
   ============================================= */
#basicMathRoot .bm-feedback-overlay {
  position: absolute !important;
  inset: 0 !important;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(8px);
}
#basicMathRoot .bm-feedback-overlay.show { display: flex !important; }
#basicMathRoot .bm-feedback-card {
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  border: 2px solid var(--border);
  border-radius: 28px;
  padding: 40px 32px;
  text-align: center;
  max-width: 360px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
  animation: bm-cardIn 0.4s ease;
}
#basicMathRoot .bm-feedback-icon    { font-size: 4rem; margin-bottom: 16px; }
#basicMathRoot .bm-feedback-title   { font-family: 'Fredoka One', cursive; font-size: 2rem; margin-bottom: 8px; }
#basicMathRoot .bm-feedback-rewards { display: flex; gap: 16px; justify-content: center; margin: 16px 0; flex-wrap: wrap; }
#basicMathRoot .bm-reward-chip {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 8px 16px;
  font-weight: 800;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 4px;
}
#basicMathRoot .bm-feedback-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  border-radius: 16px;
  padding: 14px 32px;
  font-family: 'Fredoka One', cursive;
  font-size: 1.2rem;
  color: #1a1a1a;
  cursor: pointer;
  width: 100%;
  transition: all 0.25s;
  margin-top: 8px;
}
#basicMathRoot .bm-feedback-btn:hover { transform: scale(1.05); box-shadow: var(--glow); }

/* =============================================
   CONFETTI — absolute, clipped by container
   ============================================= */
#basicMathRoot .bm-confetti-piece {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  z-index: 200;
  pointer-events: none;
  animation: bm-confettiFall linear forwards;
}
@keyframes bm-confettiFall {
  0%   { transform: translateY(-20px) rotate(0deg);   opacity: 1; }
  100% { transform: translateY(700px) rotate(720deg); opacity: 0; }
}

/* =============================================
   ACHIEVEMENT TOAST — absolute inside container
   ============================================= */
#basicMathRoot .bm-achievement-toast {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-200px);
  background: linear-gradient(135deg, #f7971e, #ffd200);
  color: #1a1a1a;
  border-radius: 50px;
  padding: 12px 24px;
  font-weight: 800;
  font-size: 0.95rem;
  z-index: 300;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 8px 30px rgba(247,151,30,0.6);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  white-space: nowrap;
}
#basicMathRoot .bm-achievement-toast.show { transform: translateX(-50%) translateY(0); }

/* =============================================
   CONTROL BAR — absolute, bottom of container
   ============================================= */
#basicMathRoot #bm-controlBar {
  position: absolute !important;
  bottom: 0 !important; left: 0 !important; right: 0 !important;
  height: 70px !important;
  z-index: 50;
  display: flex !important;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: rgba(15,12,41,0.85);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  width: 100% !important;
  box-sizing: border-box !important;
}
#basicMathRoot .bm-ctrl-btn {
  background: var(--glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
  border-radius: 14px;
  padding: 10px 18px;
  cursor: pointer;
  color: var(--text);
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.25s;
  white-space: nowrap;
}
#basicMathRoot .bm-ctrl-btn:hover  { transform: scale(1.05); border-color: var(--primary); box-shadow: 0 0 15px rgba(247,151,30,0.4); }
#basicMathRoot .bm-ctrl-btn:active { transform: scale(0.95); }
#basicMathRoot .bm-ctrl-btn.music-on   { border-color: var(--accent); box-shadow: 0 0 12px rgba(33,212,253,0.3); }
#basicMathRoot .bm-ctrl-btn.close-btn  { background: linear-gradient(135deg, rgba(247,38,63,0.3), rgba(255,107,107,0.2)); border-color: var(--red); }
#basicMathRoot .bm-ctrl-btn.close-btn:hover { box-shadow: 0 0 15px rgba(247,38,63,0.5); }
#basicMathRoot .bm-home-ctrl { background: linear-gradient(135deg, rgba(247,151,30,0.2), rgba(255,210,0,0.1)); }
#basicMathRoot .bm-music-icon { font-size: 1.2rem; }
#basicMathRoot .bm-music-icon.playing { animation: bm-musicBounce 0.6s ease-in-out infinite alternate; }
@keyframes bm-musicBounce { from { transform: scale(1); } to { transform: scale(1.2); } }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 400px) {
  #basicMathRoot .bm-modes-grid   { grid-template-columns: repeat(2, 1fr); }
  #basicMathRoot .bm-levels-grid  { grid-template-columns: repeat(auto-fill, minmax(55px, 1fr)); }
  #basicMathRoot .bm-question-text { font-size: 1.6rem; }
  #basicMathRoot .bm-options-grid  { gap: 8px; }
  #basicMathRoot .bm-option-btn    { padding: 14px 8px; font-size: 1.1rem; }
}