/* Modern Color Palette */
:root {
  --primary: #4063ac;
  --secondary: #35313b;
  --accent: #00ffff;
  --dark: #0f172a;
  --light: #f8fafc;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
}
/* Game Mode Selector */
.game-mode-selector {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 30px 0;
  flex-wrap: wrap;
}

.mode-option {
  background: rgba(255, 255, 255, 0.1);
  padding: 20px;
  border-radius: 10px;
  width: 280px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.mode-option:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-5px);
}

.mode-option.selected {
  background: rgba(0, 255, 255, 0.1);
  border-color: var(--accent);
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.3);
}

.mode-option h3 {
  color: var(--accent);
  margin-bottom: 10px;
  font-family: 'Orbitron', sans-serif;
}

.mode-option p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .game-mode-selector {
    flex-direction: column;
    align-items: center;
  }
  
  .mode-option {
    width: 100%;
    max-width: 300px;
  }
}
#ol {
  z-index: 100; /* Higher than floating numbers */
  background: rgba(7, 12, 22, 0.95); /* Semi-transparent dark */
  display: flex; /* Ensure it's visible when shown */
}
/* === Base Reset === */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Montserrat', sans-serif;
  background: #141414; /* Dark background */
  color: #f5f4f4;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: fadeInBody 1s ease;
}

@keyframes fadeInBody {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Game Controls */
.game-controls {
  position: fixed;
  top: 10px;
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 1000;
}

/* Header Styles */
header {
  text-align: center;
  padding: 20px 0;
  margin-bottom: 20px;
}

#main-heading {
  font-family: 'Orbitron', sans-serif;
  font-size: 3.5rem;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  margin-bottom: 15px;
  letter-spacing: 2px;
  color: #425857;
  text-shadow: 0 0 10px #74bbb9, 0 0 20px #00fff7;
  margin-top: 30px;
  animation: fadeDown 1s ease-out;
}
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-40px); }
  to { opacity: 1; transform: translateY(0); }
}

/* === Game Info Panel === */
#game-info {
  background: rgba(255, 255, 255, 0.05);
  padding: 15px 25px;
  border-radius: 10px;
  margin-top: 15px;
  display: flex;
  gap: 25px;
  font-weight: bold;
  font-size: 1.1rem;
  box-shadow: 0 0 12px rgba(0, 255, 255, 0.2);
}

#game-info div span {
  color: #44422f;
  font-weight: bold;
}

#game-info div {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.1rem;
  color: var(--accent);
}
.image-container {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 5px;
}

.image-container img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* Card Styles */
table {
  margin: 20px auto;
  border-spacing: 10px;
}

td {
  width: 100px;
  height: 100px;
  perspective: 1000px;
  border-radius: 10px;
  position: relative;
}

td:hover {
  transform: scale(1.05);
}

/* Card Styles */
.inner {
  width: 100%;
  height: 100%;
  position: relative;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

table {
  margin-top: 30px;
  border-spacing: 10px;
}

td {
  width: 100px;
  height: 100px;
  perspective: 1000px;
  border-radius: 10px;
}

.inner {
  width: 100%;
  height: 100%;
  position: relative;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.front, .back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 8px;
}

.front {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  transform: rotateY(0deg);
}
.binary-card {
  font-family: 'Courier New', monospace;
  font-size: 1rem;
  background: #1a1a1a;
  color: #00ff00;
  padding: 5px;
  text-align: center;
  word-break: break-word;
  border: 1px solid #333;
  box-shadow: inset 0 0 5px rgba(0,255,0,0.2);
}

.binary-card span {
  display: inline-block;
  padding: 3px 6px;
  background: rgba(0,0,0,0.3);
  border-radius: 3px;
}
/* Binary Cards */
.binary-card {
  font-family: 'Courier New', monospace;
  font-size: 1rem;
  background: #1a1a1a;
  color: #00ff00;
  padding: 5px;
  text-align: center;
  word-break: break-word;
  border: 1px solid #333;
  box-shadow: inset 0 0 5px rgba(0,255,0,0.2);
}

.binary-card span {
  display: inline-block;
  padding: 3px 6px;
  background: rgba(0,0,0,0.3);
  border-radius: 3px;
}

/* Decimal Cards */
.back:not(.binary-card) {
  font-size: 1.8rem;
  font-weight: bold;
  color: #ffffff;
  background: #1a1a1a;
}

/* Floating Numbers */
.floating-number {
  position: absolute;
  color: rgba(204, 210, 29, 0.15);
  font-size: 24px;
  font-weight: bold;
  animation: floatUp linear infinite;
  font-family: 'Orbitron', monospace;
  user-select: none;
  text-shadow: 0 0 5px rgba(189, 215, 215, 0.5);
  opacity: 1;
}

@keyframes floatUp {
  0% {
    transform: translateY(100vh) translateX(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-10vh) translateX(calc(var(--random-drift, 0) * 1px));
    opacity: 0;
  }
}
/* Difficulty-specific styles */
.easy .binary-card {
  font-size: 1.2rem;
}

.normal .binary-card {
  font-size: 1.1rem;
}

.medium .binary-card {
  font-size: 0.9rem;
}

.hard .binary-card {
  font-size: 0.7rem;
  word-break: break-all;
}

.expert .binary-card {
  font-size: 0.6rem;
  word-break: break-all;
  line-height: 1.1;
}

/* Card size adjustments */
.easy td, .normal td {
  width: 100px;
  height: 100px;
}
/* Card sizes by level */
.beginner td {
  width: 120px;
  height: 120px;
}

.intermediate td {
  width: 110px;
  height: 110px;
}

.advanced td {
  width: 100px;
  height: 100px;
}

.expert td {
  width: 90px;
  height: 90px;
}

/* Logo cards */
.logo-card {
  padding: 10px;
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-card .image-container {
  width: 90%;
  height: 90%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-card img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* Binary cards */
.binary-card {
  font-family: 'Courier New', monospace;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 5px;
  background: #f0f0f0;
  color: #333;
}
/* Binary card styling */
.binary-card {
  font-family: 'Courier New', monospace;
  background: #000000;
  color: #ce7b7b;
  padding: 10px;
  text-align: center;
  font-weight: bold;
}

/* Decimal card styling */
.back:not(.binary-card) {
  font-size: 1.8rem;
  font-weight: bold;
  color: #333;
  background: #f8f8f8;
}

/* Different sizes for levels */
.beginner .binary-card { font-size: 1.2rem; }
.intermediate .binary-card { font-size: 1rem; }
.advanced .binary-card { font-size: 0.8rem; }
.expert .binary-card { font-size: 0.6rem; word-break: break-all; }
.beginner .binary-card {
  font-size: 1.2rem;
}

.intermediate .binary-card {
  font-size: 1rem;
}

.advanced .binary-card {
  font-size: 0.8rem;
}

.expert .binary-card {
  font-size: 0.6rem;
  word-break: break-all;
}
.medium td {
  width: 90px;
  height: 90px;
}

.hard td {
  width: 80px;
  height: 80px;
}

.expert td {
  width: 70px;
  height: 70px;
}
.back:not(.binary-card) {
  font-size: 1.8rem;
  font-weight: bold;
  color: #ffffff;
  background: #1a1a1a;
}
.back {
  background: #a15b5b;
  color: #438989;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2em;
  transform: rotateY(180deg);
  padding: 10px; /* Add some padding */
  overflow: hidden; /* Prevent image overflow */
}
.back img {
  max-width: 90%; /* Limit image width */
  max-height: 90%; /* Limit image height */
  object-fit: contain; /* Maintain aspect ratio */
  display: block; /* Remove extra space under image */
}

/* Binary Card Specific */
.binary-card {
  font-family: 'Courier New', monospace;
  font-size: 1.2rem;
  padding: 5px;
  word-break: break-all; /* Prevent long binary numbers from overflowing */
}

/* Animations */
@keyframes cardFlip {
  0% { transform: rotateY(0); }
  100% { transform: rotateY(180deg); }
}

@keyframes matchPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-5px); }
  40%, 80% { transform: translateX(5px); }
}

.matched {
  animation: matchPulse 0.5s ease-out;
}

.mismatch {
  animation: shake 0.5s ease-in-out;
}

/* Button Styles */
button {
  background: linear-gradient(45deg, #08728f, #0d0d0d);
  color: rgb(248, 245, 245);
  border: none;
  border-radius: 10px;
  padding: 12px 24px;
  font-size: 1em;
  font-weight: bold;
  margin: 10px;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  box-shadow: 0 0 10px #424042, 0 0 10px #eeeef7;
}

button:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
  box-shadow: 0 0 15px #8e8ad0, 0 0 25px #3fa3a3;
}

.grid-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  margin-top: 30px;
}

.grid-buttons button {
  min-width: 100px;
}

/* Modal Styles */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  background: rgba(17, 58, 85, 0.95);
  color: #fff;
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 0 30px rgba(51, 127, 127, 0.3);
}

.modal-content {
  background: linear-gradient(135deg, #c7d6ed, #0f172a);
  padding: 30px;
  border-radius: 15px;
  max-width: 500px;
  width: 90%;
  text-align: center;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #133f3e;
  text-shadow: 0 0 5px #085552;
}

.modal h2 {
  color: var(--accent);
  margin-bottom: 20px;
  font-family: 'Orbitron', sans-serif;
}

/* Instruction Overlay */
#ol {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(240, 246, 239, 0.95);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9998;
  backdrop-filter: blur(5px);
}

#inst {
  max-width: 600px;
  padding: 30px;
  background: rgba(30, 41, 59, 0.8);
  border-radius: 15px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

#inst h2 {
  color: var(--accent);
  color: #03032c;
  margin-bottom: 10px;
  text-shadow: 0 0 5px rgba(0, 255, 255, 0.5);
  font-family: 'Orbitron', sans-serif;
  font-size: 2.5rem;
  text-align: center;
}

#inst ul {
  text-align: left;
  margin: 20px 0;
  padding-left: 20px;
}
#inst p, #inst li {
  font-size: 1.1rem;
  margin: 8px 0;
}

#inst li {
  margin-bottom: 10px;
  line-height: 1.6;
}

/* Message Box */
#message-box {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: linear-gradient(135deg, #1e293b, #0f172a);
  padding: 30px 40px;
  border-radius: 15px;
  text-align: center;
  z-index: 9999;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
  max-width: 80%;
  display: none;
}

#message-box h2 {
  color: var(--accent);
  margin-bottom: 20px;
}

/* Leaderboard Styles */
#leaderboard-results {
  margin: 20px 0;
  text-align: left;
}

.leaderboard-entry {
  display: flex;
  justify-content: space-between;
  padding: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive Design */
@media (max-width: 600px) {
  #main-heading {
    font-size: 2rem;
  }
button {
    width: 90%;
}
  #game-info {
    flex-wrap: wrap;
    gap: 15px;
    padding: 10px;
    flex-direction: column;
    align-items: center;
  }
  
td {
    height: 80px;
    width: 80px;
    perspective: 1000px;
    border-radius: 10px;
  }
  
  .grid-buttons button {
    min-width: 80px;
    padding: 8px 15px;
  }
}

@media (max-width: 600px) {
td {
    height: 60px;
    width: 60px;
  }
table {
  margin-top: 30px;
  border-spacing: 10px;
}
.inner {
  transition: transform 0.6s;
  transform-style: preserve-3d;
  width: 100%;
  height: 100%;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(255,255,255,0.1);
}

.front, .back {
  border-radius: 10px;
  backface-visibility: hidden;
  position: absolute;
  width: 100%;
  height: 100%;
}

.back {
  background: #100b0b;
  color: #364848;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2em;
  transform: rotateY(180deg);
}
}

.grid-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  margin-top: 20px;
}
/* === Animations === */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* === Responsive === */
@media (max-width: 600px) {
  #game-info {
    flex-direction: column;
    align-items: center;
  }

}
table {
  margin-top: 30px;
  border-spacing: 10px;
}

td {
  width: 100px;
  height: 100px;
  perspective: 1000px;
  border-radius: 10px;
}

.inner {
  transition: transform 0.6s;
  transform-style: preserve-3d;
  width: 100%;
  height: 100%;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(255,255,255,0.1);
}

.front, .back {
  border-radius: 10px;
  backface-visibility: hidden;
  position: absolute;
  width: 100%;
  height: 100%;
}

.back {
  background: #100b0b;
  color: #364848;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2em;
  transform: rotateY(180deg);
}

/* Floating Numbers Container */
#floating-numbers {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  z-index: 1; /* Just above background, below UI */
}
/* Instruction overlay */
#ol {
  z-index: 100; /* Higher than floating numbers */
  background: rgba(7, 12, 22, 0.95); /* Semi-transparent dark */
}
/* Individual number */
.floating-number {
  position: absolute;
  color: rgba(204, 210, 29, 0.15); /* Neon blue glow */
  font-size: 24px;
  font-weight: bold;
  animation: floatUp linear infinite;
  font-family: 'Orbitron', monospace;
  user-select: none;
  text-shadow: 0 0 5px rgba(189, 215, 215, 0.5);
  opacity: 1;
}

/* Floating Animation */
@keyframes floatUp {
  0% {
    transform: translateY(100vh) translateX(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-10vh) translateX(calc(var(--random-drift, 0) * 1px));
    opacity: 0;
  }
}

/* Add these to ensure animations work */
.matched, .mismatch {
  animation-fill-mode: forwards;
}

/* Make sure these aren't being overridden */
.matched {
  animation: matchPulse 0.5s ease-out !important;
}

.mismatch {
  animation: shake 0.5s ease-in-out !important;
}