/* 🎮 General Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: linear-gradient(135deg, #1a1a2e, #16213e, #0f3460);
  font-family: "Poppins", sans-serif;
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  overflow-x: hidden;
  padding: 20px;
}

/* 🌟 Main Container */
.container {
  text-align: center;
  padding: 20px;
  max-width: 900px;
  width: 100%;
}

/* ✨ Headings */
.title {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  color: #00e0ff;
  text-shadow: 0 0 15px rgba(0, 224, 255, 0.5);
  animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
  from { text-shadow: 0 0 15px rgba(0, 224, 255, 0.5); }
  to { text-shadow: 0 0 25px rgba(0, 224, 255, 0.8), 0 0 35px rgba(0, 224, 255, 0.5); }
}

/* 📋 Instruction Cards */
.instruction-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 25px;
  margin-bottom: 40px;
}

.instruction-card {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 15px;
  padding: 25px;
  width: 280px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  animation: fadeInUp 0.8s ease forwards;
  opacity: 0;
}

.instruction-card:nth-child(1) {
  animation-delay: 0.2s;
}

.instruction-card:nth-child(2) {
  animation-delay: 0.4s;
}

.instruction-card:nth-child(3) {
  animation-delay: 0.6s;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.instruction-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 40px rgba(0, 224, 255, 0.2);
}

.card-icon {
  font-size: 3rem;
  margin-bottom: 15px;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-15px);
  }
  60% {
    transform: translateY(-7px);
  }
}

.instruction-card h2 {
  color: #00e0ff;
  margin-bottom: 15px;
  font-size: 1.5rem;
}

.instruction-card p, .instruction-card li {
  color: #ccc;
  text-align: left;
  margin-bottom: 10px;
  line-height: 1.5;
}

.instruction-card ul, .instruction-card ol {
  padding-left: 20px;
}

/* 🎨 Demo Section */
.demo-section {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 15px;
  padding: 25px;
  margin-bottom: 30px;
  animation: fadeIn 1s ease forwards;
  animation-delay: 0.8s;
  opacity: 0;
}

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

.demo-section h2 {
  color: #00e0ff;
  margin-bottom: 20px;
  font-size: 1.8rem;
}

.demo-board {
  display: grid;
  grid-template-columns: repeat(2, 100px);
  grid-template-rows: repeat(2, 100px);
  gap: 15px;
  justify-content: center;
  margin: 20px auto;
}

.demo-btn {
  width: 100px;
  height: 100px;
  border-radius: 25%;
  cursor: pointer;
  transition: transform 0.2s, opacity 0.2s;
  border: 3px solid rgba(255, 255, 255, 0.2);
  animation: pulse 3s infinite;
}

.demo-btn:nth-child(1) {
  animation-delay: 0s;
}

.demo-btn:nth-child(2) {
  animation-delay: 0.5s;
}

.demo-btn:nth-child(3) {
  animation-delay: 1s;
}

.demo-btn:nth-child(4) {
  animation-delay: 1.5s;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.4);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 0 0 10px rgba(255, 255, 255, 0);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
  }
}

.demo-btn.green { background: #4caf50; }
.demo-btn.red { background: #f44336; }
.demo-btn.yellow { background: #ffeb3b; }
.demo-btn.blue { background: #2196f3; }

.demo-section p {
  color: #ccc;
  margin-top: 15px;
  font-style: italic;
}

/* 🔙 Back Button */
.back-button {
  background: #00e0ff;
  color: #0a0a0a;
  font-weight: bold;
  border: none;
  padding: 12px 25px;
  border-radius: 30px;
  font-size: 1rem;
  cursor: pointer;
  box-shadow: 0 0 20px rgba(0, 224, 255, 0.5);
  transition: all 0.3s;
  margin-top: 20px;
  animation: fadeIn 1s ease forwards;
  animation-delay: 1s;
  opacity: 0;
}

.back-button:hover {
  background: #00bfff;
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(0, 224, 255, 0.7);
}

/* ❤️ Footer */
footer {
  position: relative;
  bottom: 10px;
  font-size: 0.9rem;
  color: #aaa;
  margin-top: 40px;
}

/* 📱 Responsive Design */
@media (max-width: 768px) {
  .title { font-size: 2rem; }
  .instruction-card {
    width: 100%;
    max-width: 400px;
  }
  .demo-board {
    grid-template-columns: repeat(2, 80px);
    grid-template-rows: repeat(2, 80px);
  }
  .demo-btn {
    width: 80px;
    height: 80px;
  }
}

@media (max-width: 480px) {
  .title { font-size: 1.8rem; }
  .instruction-card {
    padding: 20px;
  }
  .demo-board {
    grid-template-columns: repeat(2, 70px);
    grid-template-rows: repeat(2, 70px);
  }
  .demo-btn {
    width: 70px;
    height: 70px;
  }
}