:root {
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.4);
  --secondary: #06b6d4;
  --accent: #f59e0b;
  --bg-dark: #020617;
  --bg-card: rgba(15, 23, 42, 0.8);
  --text-main: #f1f5f9;
  --text-dim: #94a3b8;
  --glass: rgba(255, 255, 255, 0.03);
  --border: rgba(255, 255, 255, 0.08);
  --font-en: 'Inter', system-ui, -apple-system, sans-serif;
  --font-ar: 'Noto Sans Arabic', sans-serif;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-en);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(to bottom, var(--primary), var(--secondary));
  border-radius: 10px;
}

/* Background Elements */
.bg-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.05) 0%, transparent 40%),
              radial-gradient(circle at 90% 80%, rgba(6, 118, 212, 0.05) 0%, transparent 40%);
  pointer-events: none;
  z-index: -1;
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Navigation */
aside {
  width: 320px;
  height: 100vh;
  position: sticky;
  top: 0;
  background: var(--glass);
  backdrop-filter: blur(20px);
  border-right: 1px solid var(--border);
  padding: 3rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px var(--primary-glow);
}

.brand h2 {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

nav ul {
  list-style: none;
}

nav li {
  margin-bottom: 0.5rem;
}

nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
}

nav a:hover, nav a.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
  transform: translateX(5px);
}

nav a.active {
  background: linear-gradient(to right, rgba(99, 102, 241, 0.1), transparent);
  border-left: 2px solid var(--primary);
}

/* Main Content Area */
main {
  flex: 1;
  position: relative;
}

.hero {
  position: relative;
  height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 200px;
  background: linear-gradient(to top, var(--bg-dark), transparent);
}

.hero-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.4) saturate(1.2);
  transform: scale(1.1);
  transition: transform 20s ease-out;
}

.hero:hover .hero-img {
  transform: scale(1.2);
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 800px;
  padding: 0 2rem;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 900;
  margin-bottom: 1.5rem;
  background: linear-gradient(to bottom, #fff, var(--text-dim));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
}

.badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--primary-glow);
  border: 1px solid var(--primary);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 2rem;
}

/* Tutorial Sections */
.sections-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 6rem 2rem;
}

section {
  margin-bottom: 10rem;
  scroll-margin-top: 4rem;
}

.section-label {
  color: var(--primary);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 1rem;
  display: block;
}

h2 {
  font-size: 2.75rem;
  font-weight: 800;
  margin-bottom: 3rem;
  letter-spacing: -1px;
}

/* Detailed Bilingual Blocks */
.deep-dive {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.en-side, .ar-side {
  flex: 1;
}

.ar-side {
  direction: rtl;
  font-family: var(--font-ar);
}

.deep-dive p {
  font-size: 1.15rem;
  color: var(--text-dim);
  margin-bottom: 2rem;
}

.highlight-box {
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 2rem;
  border-radius: 1.5rem;
  margin: 2rem 0;
  position: relative;
  overflow: hidden;
}

.highlight-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary);
}

/* Grid Cards */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 4rem 0;
}

.tech-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 2.5rem;
  border-radius: 2rem;
  transition: all 0.5s ease;
  position: relative;
}

.tech-card:hover {
  transform: translateY(-10px);
  border-color: var(--primary);
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.tech-card i {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 1.5rem;
  display: block;
}

/* Code Mirror Styles */
pre {
  background: #010409;
  padding: 2.5rem;
  border-radius: 1.5rem;
  border: 1px solid var(--border);
  overflow-x: auto;
  margin: 3rem 0;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.5);
}

code {
  font-family: 'Fira Code', monospace;
  font-size: 0.95rem;
  color: #e6edf3;
  line-height: 1.6;
}

/* Responsive */
@media (max-width: 1200px) {
  .deep-dive {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
}

@media (max-width: 768px) {
  aside {
    display: none;
  }
  .hero h1 {
    font-size: 2.5rem;
  }
}