:root {
  --bg: #020617;
  --bg2: #0f172a;
  --glass: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.15);
  --primary: #6366f1;
  --secondary: #22d3ee;
  --danger: #ef4444;
  --warning: #f59e0b;
  --safe: #22c55e;
  --text: #e5e7eb;
  --muted: #9ca3af;
}

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

body {
  font-family: "Inter", sans-serif;
  background: radial-gradient(circle at top, var(--bg2), var(--bg));
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.7;
}

/* Floating Gradient Blobs */
.blob {
  position: fixed;
  width: 320px;
  height: 320px;
  background: linear-gradient(135deg, #6366f1, #22d3ee);
  border-radius: 50%;
  filter: blur(130px);
  opacity: 0.35;
  animation: float 14s infinite alternate ease-in-out;
  z-index: -1;
}

.blob.one { top: 5%; left: 5%; }
.blob.two { bottom: 5%; right: 5%; animation-delay: 4s; }

@keyframes float {
  from { transform: translateY(0); }
  to   { transform: translateY(-80px); }
}

/* Top Navigation Bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(2, 6, 23, 0.75);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topbar span {
  font-weight: 800;
  letter-spacing: 1px;
}

.topbar .links a {
  margin-left: 12px;
  text-decoration: none;
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.topbar .links a:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.6);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 120px 20px 80px;
}

.hero h1 {
  font-size: 3.8rem;
  font-weight: 800;
  background: linear-gradient(90deg, #6366f1, #22d3ee);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
  text-shadow: 0 0 40px rgba(99, 102, 241, 0.5);
}

.hero h2 {
  font-size: 1.4rem;
  color: var(--muted);
  margin-bottom: 10px;
}

.tagline {
  color: var(--secondary);
  font-style: italic;
  font-weight: 500;
}

/* Main Container */
.container {
  max-width: 1050px;
  margin: auto;
  padding: 0 20px 90px;
}

/* Glass Cards */
.card {
  background: var(--glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(18px);
  border-radius: 20px;
  padding: 34px;
  margin-bottom: 45px;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.3);

  /* Animation base */
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.9s ease;
}

.card.visible {
  opacity: 1;
  transform: translateY(0);
}

.card:hover {
  transform: scale(1.02);
  box-shadow: 0 0 70px rgba(99, 102, 241, 0.45);
}

/* Headings */
.card h3 {
  font-size: 1.7rem;
  margin-bottom: 15px;
  color: #fff;
}

.card h4 {
  margin-top: 22px;
  margin-bottom: 10px;
  color: var(--secondary);
  font-weight: 600;
}

/* Text */
.card p {
  margin-bottom: 14px;
  color: var(--text);
}

.card ul,
.card ol {
  padding-left: 22px;
  margin-top: 10px;
}

.card li {
  margin-bottom: 8px;
  color: var(--muted);
}

/* Inline Code */
code {
  background: rgba(255,255,255,0.08);
  padding: 2px 6px;
  border-radius: 4px;
  color: #fca5a5;
  font-family: Consolas, monospace;
}

/* Code Blocks */
pre {
  background: #020617;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin: 18px 0;
  overflow-x: auto;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.5);
}

pre code {
  color: #fca5a5;
  background: none;
  padding: 0;
}

/* Notes */
.note {
  margin-top: 10px;
  color: var(--primary);
  font-weight: 500;
}

/* Blockquote */
blockquote {
  border-left: 4px solid var(--warning);
  padding-left: 14px;
  margin: 12px 0;
  color: #fde68a;
  font-style: italic;
}

/* Critical Warning */
.critical {
  color: var(--danger);
  font-weight: 600;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%   { text-shadow: 0 0 5px rgba(239,68,68,0.4); }
  50%  { text-shadow: 0 0 30px rgba(239,68,68,1); }
  100% { text-shadow: 0 0 5px rgba(239,68,68,0.4); }
}

/* Conclusion Highlight */
.conclusion {
  border: 1px solid var(--primary);
  background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(34,211,238,0.05));
}

/* Back Link */
.back-link {
  text-align: center;
  margin-top: 50px;
}

.back-link a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  border: 1px solid var(--primary);
  padding: 12px 22px;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.back-link a:hover {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 0 25px rgba(99, 102, 241, 0.6);
  transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.4rem;
  }

  .hero h2 {
    font-size: 1.1rem;
  }

  .card {
    padding: 24px;
  }

  .topbar {
    flex-direction: column;
    gap: 10px;
  }
}