:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --secondary: #dc2626;
  --accent: #f59e0b;
  --dark-bg: #0f172a;
  --darker-bg: #020617;
  --card-bg: #1e293b;
  --text: #e2e8f0;
  --text-light: #94a3b8;
  --success: #10b981;
  --warning: #f97316;
  --error: #ef4444;
}

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

body {
  font-family: 'Roboto', sans-serif;
  background-color: var(--dark-bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.main-header {
  background: linear-gradient(135deg, var(--primary), var(--darker-bg));
  color: white;
  padding: 2rem;
  text-align: center;
  border-radius: 0 0 20px 20px;
  margin-bottom: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.header-content h1 {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin-bottom: 0.5rem;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.byline {
  font-size: 1.2rem;
  color: var(--accent);
  font-weight: bold;
}

.content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.section-card {
  background-color: var(--card-bg);
  border-radius: 15px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

.section-card h2 {
  color: var(--accent);
  font-size: 2rem;
  margin-bottom: 1.5rem;
  text-align: center;
  border-bottom: 2px solid var(--primary);
  padding-bottom: 0.5rem;
}

.cube-fact {
  margin-bottom: 1.5rem;
}

.cube-fact h3 {
  color: var(--primary);
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  font-size: 1.1rem;
  font-weight: bold;
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.3s ease;
  text-align: center;
  border: none;
  cursor: pointer;
}

.primary-btn {
  background-color: var(--primary);
  color: white;
}

.primary-btn:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
}

.secondary-btn {
  background-color: var(--accent);
  color: var(--darker-bg);
}

.secondary-btn:hover {
  background-color: #d97706;
  color: white;
  transform: translateY(-2px);
}

.tertiary-btn {
  background-color: var(--success);
  color: white;
}

.tertiary-btn:hover {
  background-color: #059669;
  transform: translateY(-2px);
}

.tutorial-image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1rem auto;
  display: block;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.wide-image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1rem auto;
  display: block;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.algorithm-image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1rem auto;
  display: block;
  background-color: white;
  padding: 1rem;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.image-gallery img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.algorithm {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--primary);
}

.algorithm h3 {
  color: var(--accent);
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

code {
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--error);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: monospace;
}

.warning-box {
  background-color: rgba(239, 68, 68, 0.1);
  border-left: 4px solid var(--error);
  padding: 1.5rem;
  margin: 2rem 0;
  border-radius: 0 8px 8px 0;
}

.warning-box h3 {
  color: var(--error);
  margin-bottom: 0.5rem;
}

.congratulations {
  position: relative;
  background: linear-gradient(135deg, var(--success), #047857);
  color: white;
  padding: 3rem 2rem;
  text-align: center;
  border-radius: 15px;
  margin: 2rem 0;
  overflow: hidden;
}

.congratulations h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}

.congratulations p {
  font-size: 1.2rem;
  position: relative;
  z-index: 1;
}

.confetti {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><circle cx="10" cy="10" r="2" fill="white" opacity="0.7"/></svg>');
  background-size: 20px 20px;
  opacity: 0.6;
  animation: confetti 10s linear infinite;
}

@keyframes confetti {
  0% { background-position: 0 0; }
  100% { background-position: 100px 100px; }
}

.main-footer {
  background-color: var(--darker-bg);
  color: var(--text-light);
  text-align: center;
  padding: 1.5rem;
  margin-top: 3rem;
  border-radius: 20px 20px 0 0;
}

.main-footer p {
  margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
  .button-group {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .image-gallery {
    grid-template-columns: 1fr;
  }
  
  .section-card {
    padding: 1.5rem;
  }
}