/* =========================================================================
   ENGLISH FUN LAND - MODERN WHIMSICAL & ACCESSIBLE DESIGN SYSTEM
   Bootstrap 5 + Custom Glassmorphism + Dark Mode + Print Support
   ========================================================================= */

:root {
  --font-display: "Fredoka", "Mitr", sans-serif;
  --font-body: "Mitr", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --bg-main: #f0f8ff;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-solid: #ffffff;
  --text-main: #2d3748;
  --text-muted: #718096;
  --border-subtle: rgba(226, 232, 240, 0.8);

  --primary: #4F46E5;
  --primary-light: #EEF2FF;
  --accent-pink: #FF6B9D;
  --accent-yellow: #FFD166;
  --accent-green: #06D6A0;
  --accent-blue: #118AB2;
  --accent-orange: #F78C6B;

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 12px 28px rgba(0, 0, 0, 0.08);

  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 24px;
  --radius-pill: 9999px;

  --nav-height: 70px;
}

body.dark-mode {
  --bg-main: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.85);
  --bg-card-solid: #1e293b;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --border-subtle: rgba(51, 65, 85, 0.8);
  --primary-light: #1e1b4b;
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Floating Whimsical Decors */
.deco-cloud, .deco-balloon, .deco-sun {
  position: fixed;
  pointer-events: none;
  z-index: 0;
  user-select: none;
  opacity: 0.8;
}

.cloud-1 { top: 12%; left: 4%; font-size: 3rem; animation: floatCloud 25s infinite linear; }
.cloud-2 { top: 22%; right: 8%; font-size: 2.4rem; animation: floatCloud 32s infinite linear reverse; }
.cloud-3 { top: 60%; left: 85%; font-size: 3.5rem; animation: floatCloud 28s infinite linear; }
.balloon-1 { top: 35%; left: 8%; font-size: 2.2rem; animation: floatBalloon 6s infinite ease-in-out; }
.balloon-2 { top: 70%; right: 6%; font-size: 2.6rem; animation: floatBalloon 8s infinite ease-in-out reverse; }
.deco-sun { top: 4%; right: 4%; font-size: 3.2rem; animation: rotateSun 30s infinite linear; }

@keyframes floatCloud {
  0% { transform: translateX(0); }
  50% { transform: translateX(40px); }
  100% { transform: translateX(0); }
}

@keyframes floatBalloon {
  0%, 100% { transform: translateY(0) rotate(-3deg); }
  50% { transform: translateY(-25px) rotate(4deg); }
}

@keyframes rotateSun {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Top Navigation Bar */
.topbar {
  position: sticky;
  top: 0;
  height: var(--nav-height);
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: none;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  text-decoration: none;
}

.brand-grad {
  background: linear-gradient(135deg, var(--accent-pink), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-btn {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  background: var(--primary-light);
}

.btn-install {
  background: linear-gradient(135deg, #10B981, #059669) !important;
  color: #FFFFFF !important;
  font-weight: 700 !important;
  border-color: #059669 !important;
  animation: pulseInstall 2.8s infinite ease-in-out;
}

.btn-install:hover {
  background: linear-gradient(135deg, #059669, #047857) !important;
  color: #FFFFFF !important;
}

@keyframes pulseInstall {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  50% { transform: scale(1.04); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
}

.user-chip-badge {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem 0.8rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-login-pill {
  background: linear-gradient(135deg, var(--primary), var(--accent-pink));
  color: #ffffff;
  border: none;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-login-pill:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35);
}

/* Views Management */
#app {
  position: relative;
  z-index: 10;
  padding-bottom: 4rem;
}

.view {
  display: none;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.view.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

/* Container */
.container-custom {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 3rem 1rem 2rem;
}

.hero-mascot {
  font-size: 4rem;
  display: inline-block;
  animation: bounceMascot 2s infinite ease-in-out;
}

@keyframes bounceMascot {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-14px) scale(1.05); }
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 700;
  margin-top: 0.5rem;
}

.hero-sub {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.hero-tagline {
  font-size: 1rem;
  color: var(--text-muted);
}

.hero-characters {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
}

.char-bubble {
  font-size: 2rem;
  background: var(--bg-card-solid);
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease;
}

.char-bubble:hover {
  transform: scale(1.25) rotate(10deg);
}

/* Level Grid */
.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.level-card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.level-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--lvl-grad, var(--primary));
}

.level-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-card);
  border-color: var(--lvl-color, var(--primary));
}

.level-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.level-icon { font-size: 2.2rem; }
.level-mascot { font-size: 2.6rem; }

.level-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  margin-bottom: 0.5rem;
}

.level-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.level-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.2rem;
}

.level-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
}

.level-word-count {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.btn-start-level {
  background: var(--lvl-grad, var(--primary));
  color: #ffffff;
  border: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: transform 0.2s;
}

.btn-start-level:hover {
  transform: scale(1.05);
}

/* Category View */
.level-header {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn-back {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-back:hover {
  background: var(--primary-light);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.category-icon-box {
  font-size: 2.2rem;
  background: var(--bg-card-solid);
  width: 58px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.category-details {
  flex-grow: 1;
}

.category-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.category-title-en {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.category-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  gap: 0.75rem;
  margin-top: 0.4rem;
}

.category-action-btn {
  font-size: 1rem;
  color: var(--primary);
  font-weight: bold;
}

/* 3D Flashcard Studio */
.lesson-container {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.flashcard {
  perspective: 1200px;
  width: 100%;
  max-width: 460px;
  height: 380px;
  margin: 1.5rem auto;
  cursor: pointer;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
}

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

.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 2px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.card-front {
  background: linear-gradient(145deg, var(--bg-card-solid), rgba(240, 248, 255, 0.6));
}

.card-back {
  transform: rotateY(180deg);
  background: linear-gradient(145deg, var(--bg-card-solid), rgba(254, 243, 199, 0.3));
}

.card-img {
  font-size: 5rem;
  margin-bottom: 0.75rem;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.1));
}

.card-word-en {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.3rem;
}

.card-word-th {
  font-size: 1.4rem;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.card-badge-wrap {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.card-pos-badge {
  font-size: 0.8rem;
  background: #E0E7FF;
  color: #4338CA;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
}

.card-phonetic-badge {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

.card-example-label {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent-orange);
  margin-bottom: 0.75rem;
}

.card-example {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.card-example-th {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Mastered Button */
.btn-mastered {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 0.5rem;
}

.btn-mastered.mastered {
  background: #FEF3C7;
  border-color: #F59E0B;
  color: #B45309;
}

/* Action Audio & Navigation */
.action-buttons {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 1.25rem 0;
}

.btn-audio {
  background: linear-gradient(135deg, #10B981, #059669);
  color: #ffffff;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(16, 185, 129, 0.3);
  transition: transform 0.2s;
}

.btn-audio:hover { transform: translateY(-2px); }

.btn-audio-slow {
  background: #FEF3C7;
  border: 1px solid #FCD34D;
  color: #D97706;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
}

.btn-nav-arrow {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-nav-arrow:hover { background: var(--primary-light); }

.lesson-nav-dots {
  display: flex;
  justify-content: center;
  gap: 0.4rem;
  margin: 1rem 0;
  flex-wrap: wrap;
}

.nav-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-pill);
  background: #CBD5E1;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-dot.active {
  width: 24px;
  background: var(--primary);
}

.nav-dot.mastered {
  background: #F59E0B;
}

/* Learning Game Launch Bar */
.game-launch-bar {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 2rem;
  box-shadow: var(--shadow-sm);
}

.game-btn-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.btn-game-mode {
  background: var(--bg-card-solid);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.2s ease;
}

.btn-game-mode:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.btn-game-mode .mode-icon { font-size: 1.8rem; }

/* Word Match Game Grid */
.match-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
  max-width: 640px;
  margin: 0 auto;
}

.match-card {
  aspect-ratio: 1;
  perspective: 800px;
  background: none;
  border: none;
  cursor: pointer;
}

.match-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.4s ease;
}

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

.match-card-front, .match-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
  box-shadow: var(--shadow-sm);
  border: 2px solid var(--border-subtle);
}

.match-card-front {
  background: linear-gradient(135deg, #6366F1, #4F46E5);
  color: #ffffff;
  font-size: 2rem;
}

.match-card-back {
  background: var(--bg-card-solid);
  transform: rotateY(180deg);
  color: var(--text-main);
}

.match-card-text {
  font-weight: 700;
  font-size: 1.1rem;
  text-align: center;
}

.match-card-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.match-card.matched .match-card-back {
  background: #D1FAE5;
  border-color: #10B981;
  color: #065F46;
  animation: pulseMatched 0.5s ease;
}

@keyframes pulseMatched {
  0% { transform: rotateY(180deg) scale(0.9); }
  50% { transform: rotateY(180deg) scale(1.1); }
  100% { transform: rotateY(180deg) scale(1); }
}

/* Spelling Bee */
.spell-slots-wrap {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.spell-slot {
  width: 50px;
  height: 56px;
  border-bottom: 3px solid var(--primary);
  background: rgba(79, 70, 229, 0.06);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
  cursor: pointer;
  transition: all 0.2s;
}

.spell-slot.filled {
  background: var(--primary-light);
  box-shadow: var(--shadow-sm);
}

.spell-slot.correct {
  border-bottom-color: #10B981;
  background: #D1FAE5;
  color: #065F46;
}

.spell-slot.wrong {
  border-bottom-color: #EF4444;
  background: #FEE2E2;
  color: #991B1B;
}

.spell-tiles-wrap {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.spell-tile {
  background: var(--bg-card-solid);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  width: 52px;
  height: 56px;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.spell-tile:hover:not(:disabled) {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.spell-tile.used {
  opacity: 0.25;
  cursor: default;
  pointer-events: none;
}

/* Listening Master Wave Button */
.btn-listen-wave {
  background: linear-gradient(135deg, #3B82F6, #1D4ED8);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-pill);
  padding: 1rem 2rem;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.35);
  transition: all 0.2s;
}

.btn-listen-wave:hover {
  transform: scale(1.05);
}

.listen-options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  max-width: 540px;
  margin: 0 auto;
}

.listen-opt-btn, .quiz-opt-btn {
  background: var(--bg-card-solid);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: all 0.2s;
}

.listen-opt-btn:hover, .quiz-opt-btn:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  transform: translateX(4px);
}

.listen-opt-btn.correct, .quiz-opt-btn.correct {
  background: #D1FAE5 !important;
  border-color: #10B981 !important;
  color: #065F46 !important;
}

.listen-opt-btn.wrong, .quiz-opt-btn.wrong {
  background: #FEE2E2 !important;
  border-color: #EF4444 !important;
  color: #991B1B !important;
}

/* Shake Animation */
.shake {
  animation: shakeAnimation 0.5s ease-in-out;
}

@keyframes shakeAnimation {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

/* Progress Bar */
.progress-bar {
  background: #E2E8F0;
  border-radius: var(--radius-pill);
  height: 10px;
  overflow: hidden;
}

.progress-bar.thin { height: 6px; }

.progress-fill {
  background: linear-gradient(90deg, #10B981, #3B82F6);
  height: 100%;
  border-radius: var(--radius-pill);
  transition: width 0.3s ease;
}

.hidden {
  display: none !important;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 2000;
  transition: opacity 0.2s ease;
}

.modal-overlay.hidden { display: none !important; }

/* Locked Level Card */
.level-card.locked {
  position: relative;
  opacity: 0.95;
  border-style: dashed;
}

.level-card.locked:hover {
  transform: translateY(-4px);
}

.btn-locked {
  background: #64748B !important;
  color: #FFFFFF !important;
}

.auth-gate-banner {
  background: linear-gradient(135deg, rgba(238, 242, 255, 0.95), rgba(254, 243, 199, 0.95));
  border: 2px dashed #6366F1;
  color: #1E293B;
}

.welcome-user-banner {
  background: linear-gradient(135deg, rgba(209, 250, 229, 0.95), rgba(224, 242, 254, 0.95));
  border: 1px solid #10B981;
  color: #065F46;
}

.modal-card {
  background: var(--bg-card-solid);
  border-radius: var(--radius-lg);
  max-width: 580px;
  width: 100%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-body {
  padding: 1.25rem 1.5rem;
  overflow-y: auto;
}

.btn-close-modal {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #1E293B;
  color: #FFFFFF;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: var(--shadow-lg);
  z-index: 3000;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Confetti */
.confetti-piece {
  position: fixed;
  z-index: 2500;
  border-radius: 2px;
  pointer-events: none;
  animation: fallConfetti linear forwards;
}

@keyframes fallConfetti {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(105vh) rotate(720deg); opacity: 0; }
}

/* Print Styles */
@media print {
  .topbar, .deco-cloud, .deco-balloon, .deco-sun, .action-buttons, .game-launch-bar, .toast, .voice-fab {
    display: none !important;
  }

  body {
    background: #ffffff !important;
    color: #000000 !important;
  }

  .flashcard {
    border: 2px solid #333;
    page-break-inside: avoid;
    box-shadow: none !important;
  }
}