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

html, body {
  height: 100%;
  font-family: 'Poppins', sans-serif;
  overflow-x: hidden;
}

/* Gaming Background - Dark with Grid */
body {
  background: #0a0e27;
  position: relative;
  min-height: 100vh;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Animated Grid Lines */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(138, 43, 226, 0.1) 2px, transparent 2px),
    linear-gradient(90deg, rgba(138, 43, 226, 0.1) 2px, transparent 2px);
  background-size: 50px 50px;
  animation: gridMove 20s linear infinite;
  z-index: 0;
}

@keyframes gridMove {
  0% { transform: perspective(500px) rotateX(60deg) translateY(0); }
  100% { transform: perspective(500px) rotateX(60deg) translateY(50px); }
}

/* Neon Glow Orbs */
.neon-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.4;
  pointer-events: none;
  z-index: 1;
  animation: float 8s ease-in-out infinite;
}

.orb-1 {
  width: 20vw;
  height: 20vw;
  background: radial-gradient(circle, #ff00ff, transparent);
  top: -5vw;
  left: -5vw;
  animation-delay: 0s;
}

.orb-2 {
  width: 18vw;
  height: 18vw;
  background: radial-gradient(circle, #00ffff, transparent);
  bottom: -5vw;
  right: -5vw;
  animation-delay: 2s;
}

.orb-3 {
  width: 15vw;
  height: 15vw;
  background: radial-gradient(circle, #ffff00, transparent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: 4s;
}

/* Geometric Floating Shapes */
.geo-shape {
  position: fixed;
  pointer-events: none;
  opacity: 0.1;
  z-index: 1;
}

.shape-1 {
  width: 15vw;
  height: 15vw;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 50% 40% 60% 50%;
  top: -5vw;
  left: -5vw;
  animation: morphShape 20s ease-in-out infinite, rotate 30s linear infinite;
}

.shape-2 {
  width: 12vw;
  height: 12vw;
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  border-radius: 60% 40% 50% 50%;
  bottom: -4vw;
  right: -4vw;
  animation: morphShape 25s ease-in-out infinite reverse, rotate 35s linear infinite reverse;
}

.shape-3 {
  width: 10vw;
  height: 10vw;
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  border-radius: 40% 60% 50% 50%;
  top: 50%;
  right: -3vw;
  animation: morphShape 18s ease-in-out infinite, float 8s ease-in-out infinite;
}

@keyframes morphShape {
  0%, 100% { border-radius: 50% 40% 60% 50%; transform: scale(1); }
  25% { border-radius: 40% 60% 50% 60%; transform: scale(1.1); }
  50% { border-radius: 60% 50% 40% 50%; transform: scale(0.9); }
  75% { border-radius: 50% 60% 60% 40%; transform: scale(1.05); }
}

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

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-1.5vw); }
}

/* Stars/Particles */
.star {
  position: fixed;
  width: 0.15vw;
  height: 0.15vw;
  background: white;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0;
  animation: twinkle 3s infinite;
  box-shadow: 0 0 0.5vw rgba(255, 255, 255, 0.8);
}

@keyframes twinkle {
  0%, 100% { opacity: 0; transform: scale(0); }
  50% { opacity: 1; transform: scale(1.5); }
}

.container {
  min-height: 100vh;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  z-index: 2;
  padding: 1vw;
  box-sizing: border-box;
}

/* Glass Card with Enhanced Effects */
.content {
  width: 100%;
  max-width: 45vw;
  max-height: 90vh;
  text-align: center;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(1.2vw) saturate(180%);
  -webkit-backdrop-filter: blur(1.2vw) saturate(180%);
  border-radius: 1vw;
  padding: 2.5vw 2vw;
  box-shadow:
    0 1.1vw 3vw rgba(0, 0, 0, 0.3),
    inset 0 0.06vw 0 rgba(255, 255, 255, 0.4),
    0 0 5vw rgba(255, 255, 255, 0.1);
  border: 0.12vw solid rgba(255, 255, 255, 0.2);
  position: relative;
  box-sizing: border-box;
  transform: translateY(0);
  transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  animation: slideUp 0.8s ease;
  overflow-y: auto; /* Vertical scrollbar only when content overflows */
  overflow-x: hidden; /* Explicitly prevent horizontal scrollbar */
}

/* Custom Scrollbar Styling (Vertical Only) */
.content::-webkit-scrollbar {
  width: 0.5vw;
  display: none; /* Hidden by default */
}

.content::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 0.5vw;
}

.content::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.3);
  border-radius: 0.5vw;
}

.content::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.5);
}

/* Show scrollbar only when content overflows */
.content.scroll-active::-webkit-scrollbar {
  display: block;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(3vw); }
  to { opacity: 1; transform: translateY(0); }
}

/* Animated Border Gradient */
.content::before {
  content: '';
  position: absolute;
  top: -0.2vw;
  left: -0.2vw;
  right: -0.2vw;
  bottom: -0.2vw;
  background: linear-gradient(
    45deg,
    rgba(31, 41, 55, 0.8),
    rgba(17, 24, 39, 0.8),
    rgba(55, 65, 81, 0.8),
    rgba(31, 41, 55, 0.8)
  );
  background-size: 300% 300%;
  z-index: -1;
  border-radius: 1.2vw;
  opacity: 0;
  transition: opacity 0.5s ease;
  animation: rotateBorder 4s linear infinite;
  filter: blur(0.5vw);
}

@keyframes rotateBorder {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.content:hover::before {
  opacity: 0.8;
}

.content:hover {
  transform: translateY(-0.6vw) scale(1.02);
  box-shadow: 
    0 1.5vw 4vw rgba(0, 0, 0, 0.4),
    inset 0 0.06vw 0 rgba(255, 255, 255, 0.5),
    0 0 7vw rgba(255, 255, 255, 0.2);
}

/* Sparkle Effect */
.sparkle {
  position: absolute;
  width: 0.25vw;
  height: 0.25vw;
  background: white;
  border-radius: 50%;
  pointer-events: none;
  animation: sparkleAnim 1.5s ease-out forwards;
  box-shadow: 0 0 0.9vw rgba(255, 255, 255, 0.9);
}

@keyframes sparkleAnim {
  0% { transform: scale(0) rotate(0deg); opacity: 1; }
  100% { transform: scale(1.5) rotate(180deg); opacity: 0; }
}

/* Title Styling */
h1 {
  color: #fff;
  text-shadow:
    0 0 0.9vw rgba(255, 255, 255, 0.5),
    0 0.2vw 0.4vw rgba(0, 0, 0, 0.3);
  margin-bottom: 0.9vw;
  font-weight: 700;
  font-size: 1.8rem;
  letter-spacing: 0.02vw;
  animation: titleGlow 2s ease-in-out infinite alternate;
  position: relative;
  display: inline-block;
}

@keyframes titleGlow {
  from { text-shadow: 0 0 0.9vw rgba(255, 255, 255, 0.5), 0 0.2vw 0.4vw rgba(0, 0, 0, 0.3); }
  to { text-shadow: 0 0 1.8vw rgba(255, 255, 255, 0.8), 0 0.2vw 0.4vw rgba(0, 0, 0, 0.3), 0 0 3vw rgba(255, 100, 200, 0.6); }
}

h1 i {
  display: inline-block;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-0.5vw) rotate(8deg); }
}

/* Button Enhancements */
.game-btn {
  position: relative;
  padding: 0.8vw 1.5vw;
  font-weight: 600;
  font-size: 1rem;
  border-radius: 2.8vw;
  border: none;
  color: white;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: 0 0.4vw 0.9vw rgba(0, 0, 0, 0.3);
  text-decoration: none;
  display: inline-block;
  width: 100%;
}

.btn-join {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.btn-create {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.game-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  transition: left 0.5s ease;
}

.game-btn:hover::before {
  left: 100%;
}

.game-btn:hover {
  transform: translateY(-0.25vw) scale(1.04);
  box-shadow: 0 0.7vw 1.8vw rgba(0, 0, 0, 0.4);
}

.game-btn:active {
  transform: translateY(-0.06vw) scale(1.01);
}

.game-btn i {
  margin-right: 0.4vw;
  font-size: 1.2rem;
}

/* Instructions Section */
h3 {
  color: #fff;
  text-shadow: 0 0.06vw 0.3vw rgba(0, 0, 0, 0.3);
  font-weight: 600;
  font-size: 1.8rem;
  margin-top: 1.2vw;
  margin-bottom: 0.5vw;
  animation: fadeInUp 1s ease 0.3s both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(0.9vw); }
  to { opacity: 1; transform: translateY(0); }
}

.sub-text {
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 0.06vw 0.2vw rgba(0, 0, 0, 0.2);
  line-height: 1.5;
  animation: fadeInUp 1s ease 0.5s both;
}

.timer {
  display: inline-block;
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffd700;
  text-shadow:
    0 0 0.5vw rgba(255, 215, 0, 0.8),
    0 0.06vw 0.2vw rgba(0, 0, 0, 0.3);
  padding: 0.4vw 1vw;
  background: rgba(255, 215, 0, 0.2);
  border-radius: 1.2vw;
  animation: pulse 1.5s ease-in-out infinite;
  margin-top: 0.9vw;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

/* Category Badges */
.alphabet-badge {
  display: inline-block;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 0.7vw 1.5vw;
  border-radius: 1.2vw;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.7vw;
  box-shadow: 0 0.4vw 0.9vw rgba(102, 126, 234, 0.4);
  animation: fadeInUp 1s ease 0.7s both;
}

.category-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5vw;
  margin-top: 0.7vw;
}

.badge {
  padding: 0.8vw 1.2vw;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 1.2vw;
  box-shadow: 0 0.3vw 0.7vw rgba(0, 0, 0, 0.2);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  cursor: pointer;
  border: 0.12vw solid transparent;
  animation: badgeAppear 0.6s ease both;
}

.badge:nth-child(1) { animation-delay: 0.8s; }
.badge:nth-child(2) { animation-delay: 0.9s; }
.badge:nth-child(3) { animation-delay: 1s; }
.badge:nth-child(4) { animation-delay: 1.1s; }
.badge:nth-child(5) { animation-delay: 1.2s; }

@keyframes badgeAppear {
  from { opacity: 0; transform: scale(0) rotate(180deg); }
  to { opacity: 1; transform: scale(1) rotate(0deg); }
}

.badge:hover {
  transform: translateY(-0.4vw) scale(1.1) rotate(5deg);
  box-shadow: 0 0.6vw 1.2vw rgba(0, 0, 0, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
}

.badge i {
  margin-right: 0.3vw;
}

/* Ripple Effect */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
  transform: scale(0);
  animation: rippleEffect 0.6s ease-out;
  pointer-events: none;
}

@keyframes rippleEffect {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Enhanced Responsive Media Queries for Width */
@media (min-width: 2560px) { /* For ultra-large screens like 4K LED */
  .content {
    max-width: 40vw;
    padding: 3vw 2.5vw;
  }

  h1 {
    font-size: 3rem;
  }

  h3 {
    font-size: 2.2rem;
  }

  .game-btn {
    padding: 1.2vw 2vw;
    font-size: 1.4rem;
  }

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

  .badge {
    padding: 1vw 1.5vw;
    font-size: 1.3rem;
  }

  .alphabet-badge {
    font-size: 1.4rem;
    padding: 1vw 2vw;
  }

  .sub-text {
    font-size: 1.8rem;
  }

  .timer {
    font-size: 1.6rem;
  }

  .orb-1 { width: 18vw; height: 18vw; }
  .orb-2 { width: 16vw; height: 16vw; }
  .orb-3 { width: 14vw; height: 14vw; }

  .shape-1 { width: 14vw; height: 14vw; }
  .shape-2 { width: 11vw; height: 11vw; }
  .shape-3 { width: 9vw; height: 9vw; }
}

@media (min-width: 1920px) and (max-width: 2559px) {
  .content {
    max-width: 42vw;
    padding: 2.8vw 2.2vw;
  }

  h1 {
    font-size: 2.7rem;
  }

  h3 {
    font-size: 2rem;
  }

  .game-btn {
    padding: 1vw 1.8vw;
    font-size: 1.3rem;
  }

  .game-btn i {
    font-size: 1.6rem;
  }

  .badge {
    padding: 0.9vw 1.3vw;
    font-size: 1.2rem;
  }

  .alphabet-badge {
    font-size: 1.3rem;
    padding: 0.9vw 1.8vw;
  }

  .sub-text {
    font-size: 1.6rem;
  }

  .timer {
    font-size: 1.4rem;
  }
}

@media (min-width: 1600px) and (max-width: 1919px) {
  .content {
    max-width: 45vw;
    padding: 2.5vw 2vw;
  }

  h1 {
    font-size: 2.3rem;
  }

  h3 {
    font-size: 1.8rem;
  }

  .game-btn {
    padding: 0.9vw 1.5vw;
    font-size: 1.2rem;
  }

  .game-btn i {
    font-size: 1.4rem;
  }

  .badge {
    padding: 0.8vw 1.2vw;
    font-size: 1.1rem;
  }

  .alphabet-badge {
    font-size: 1.2rem;
    padding: 0.8vw 1.5vw;
  }

  .sub-text {
    font-size: 1.4rem;
  }

  .timer {
    font-size: 1.2rem;
  }
}

@media (min-width: 1200px) and (max-width: 1599px) {
  .content {
    max-width: 50vw;
    padding: 2vw 1.8vw;
  }

  h1 {
    font-size: 2rem;
  }

  h3 {
    font-size: 1.6rem;
  }

  .game-btn {
    padding: 0.8vw 1.3vw;
    font-size: 1.1rem;
  }

  .game-btn i {
    font-size: 1.3rem;
  }

  .badge {
    padding: 0.7vw 1vw;
    font-size: 1rem;
  }

  .alphabet-badge {
    font-size: 1.1rem;
    padding: 0.7vw 1.3vw;
  }

  .sub-text {
    font-size: 1.3rem;
  }

  .timer {
    font-size: 1.1rem;
  }
}

@media (min-width: 992px) and (max-width: 1199px) {
  .content {
    max-width: 55vw;
    padding: 1.8vw 1.5vw;
  }

  h1 {
    font-size: 1.8rem;
  }

  h3 {
    font-size: 1.4rem;
  }

  .game-btn {
    padding: 0.7vw 1.2vw;
    font-size: 1rem;
  }

  .game-btn i {
    font-size: 1.2rem;
  }

  .badge {
    padding: 0.6vw 0.9vw;
    font-size: 0.9rem;
  }

  .alphabet-badge {
    font-size: 1rem;
    padding: 0.6vw 1.2vw;
  }

  .sub-text {
    font-size: 1.2rem;
  }

  .timer {
    font-size: 1rem;
  }
}

@media (min-width: 768px) and (max-width: 991px) {
  .content {
    max-width: 60vw;
    padding: 1.5vw 1.2vw;
  }

  h1 {
    font-size: 1.6rem;
  }

  h3 {
    font-size: 1.3rem;
  }

  .game-btn {
    padding: 0.6vw 1vw;
    font-size: 0.9rem;
  }

  .game-btn i {
    font-size: 1.1rem;
  }

  .badge {
    padding: 0.5vw 0.8vw;
    font-size: 0.85rem;
  }

  .alphabet-badge {
    font-size: 0.9rem;
    padding: 0.5vw 1vw;
  }

  .sub-text {
    font-size: 1.1rem;
  }

  .timer {
    font-size: 0.9rem;
  }
}

@media (min-width: 576px) and (max-width: 767px) {
  .container {
    justify-content: center;
    align-items: center;
  }

  .content {
    max-width: 80vw;
    padding: 1.2vw 0.9vw;
    border-radius: 0.7vw;
    max-height: 90vh;
  }

  h1 {
    font-size: 1.4rem;
  }

  h3 {
    font-size: 1.2rem;
  }

  .game-btn {
    padding: 0.5vw 0.9vw;
    font-size: 0.85rem;
  }

  .game-btn i {
    font-size: 1rem;
  }

  .badge {
    padding: 0.4vw 0.7vw;
    font-size: 0.8rem;
  }

  .alphabet-badge {
    font-size: 0.85rem;
    padding: 0.4vw 0.9vw;
  }

  .sub-text {
    font-size: 1rem;
  }

  .timer {
    font-size: 0.85rem;
  }

  .category-list {
    gap: 0.4vw;
  }
}

@media (min-width: 360px) and (max-width: 575px) {
  .container {
    justify-content: center;
    align-items: center;
  }

  .content {
    max-width: 90vw;
    padding: 0.9vw 0.7vw;
    margin: 0.3vw auto;
    max-height: 90vh;
  }

  h1 {
    font-size: 1.2rem;
    letter-spacing: 0.01vw;
  }

  h3 {
    font-size: 1.1rem;
  }

  .game-btn {
    padding: 0.4vw 0.8vw;
    font-size: 0.8rem;
  }

  .game-btn i {
    font-size: 0.9rem;
  }

  .badge {
    padding: 0.3vw 0.6vw;
    font-size: 0.75rem;
  }

  .alphabet-badge {
    font-size: 0.8rem;
    padding: 0.3vw 0.8vw;
  }

  .sub-text {
    font-size: 0.9rem;
  }

  .timer {
    font-size: 0.8rem;
  }

  .category-list {
    gap: 0.3vw;
  }
}

@media (max-width: 359px) {
  .container {
    justify-content: center;
    align-items: center;
  }

  .content {
    max-width: 95vw;
    padding: 0.7vw 0.5vw;
    margin: 0.3vw auto;
    max-height: 90vh;
  }

  h1 {
    font-size: 1rem;
    letter-spacing: 0;
  }

  h3 {
    font-size: 1rem;
  }

  .game-btn {
    padding: 0.3vw 0.7vw;
    font-size: 0.7rem;
  }

  .game-btn i {
    font-size: 0.85rem;
  }

  .badge {
    padding: 0.2vw 0.5vw;
    font-size: 0.7rem;
  }

  .alphabet-badge {
    font-size: 0.75rem;
    padding: 0.2vw 0.7vw;
  }

  .sub-text {
    font-size: 0.8rem;
  }

  .timer {
    font-size: 0.75rem;
  }

  .category-list {
    gap: 0.2vw;
  }
}

/* Height-Based Media Queries */
@media (max-height: 600px) {
  .container {
    justify-content: center;
    align-items: center;
    padding: 0.5vw;
  }

  .content {
    max-width: 90vw;
    max-height: 85vh;
    padding: 0.9vw 0.7vw;
    margin: 0.5vw auto;
  }

  h1 {
    font-size: 1.2rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  .game-btn {
    padding: 0.4vw 0.8vw;
    font-size: 0.8rem;
  }

  .game-btn i {
    font-size: 0.9rem;
  }

  .badge {
    padding: 0.3vw 0.6vw;
    font-size: 0.75rem;
  }

  .alphabet-badge {
    font-size: 0.8rem;
    padding: 0.3vw 0.8vw;
  }

  .sub-text {
    font-size: 0.9rem;
  }

  .timer {
    font-size: 0.8rem;
  }

  .category-list {
    gap: 0.3vw;
  }
}

/* High Zoom Levels or Very High Resolution Small Screens */
@media (max-width: 600px) and (min-resolution: 3dppx),
       (max-width: 600px) and (-webkit-device-pixel-ratio: 3) {
  .container {
    justify-content: center;
    align-items: center;
    padding: 0.3vw;
  }

  .content {
    max-width: 85vw;
    padding: 0.6vw 0.5vw;
    max-height: 85vh;
    border-radius: 0.6vw;
  }

  h1 {
    font-size: 0.9rem;
  }

  h3 {
    font-size: 0.9rem;
  }

  .game-btn {
    padding: 0.3vw 0.6vw;
    font-size: 0.65rem;
  }

  .game-btn i {
    font-size: 0.8rem;
  }

  .badge {
    padding: 0.2vw 0.5vw;
    font-size: 0.65rem;
  }

  .alphabet-badge {
    font-size: 0.7rem;
    padding: 0.2vw 0.6vw;
  }

  .sub-text {
    font-size: 0.75rem;
  }

  .timer {
    font-size: 0.7rem;
  }

  .category-list {
    gap: 0.2vw;
  }
}