/* 1. المتغيرات والألوان المحسنة */
    :root {
      --bg-dark: #0b0d10;
      --bg-medium: #11161b; 
      --bg-light: #14181f;
      --text-primary: #e8e8e8;
      --text-secondary: #b0b0b0;
      --accent-color: #00aaff;
      --accent-secondary: #ff6b6b;
      --accent-tertiary: #00ffcc;
      --accent-hover: #66ccff;
      --neon-glow: #00aaff50; 
      --gradient-primary: linear-gradient(135deg, #00aaff 0%, #00ffcc 100%);
      --gradient-secondary: linear-gradient(135deg, #ff6b6b 0%, #ffa500 100%);
      --gradient-dark: linear-gradient(135deg, #0b0d10 0%, #11161b 100%);
      --card-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --transition-bounce: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    }

    /* Light Theme Variables */
    [data-theme="light"] {
      --bg-dark: #f0f2f5;
      --bg-medium: #ffffff;
      --bg-light: #f8f9fa;
      --text-primary: #2d3748;
      --text-secondary: #4a5568;
      --accent-color: #3182ce;
      --accent-secondary: #e53e3e;
      --accent-tertiary: #38a169;
      --accent-hover: #4299e1;
      --neon-glow: #3182ce50;
      --gradient-primary: linear-gradient(135deg, #3182ce 0%, #38a169 100%);
      --gradient-secondary: linear-gradient(135deg, #e53e3e 0%, #dd6b20 100%);
      --gradient-dark: linear-gradient(135deg, #f0f2f5 0%, #ffffff 100%);
      --card-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    }

    * { 
      margin: 0; 
      padding: 0; 
      box-sizing: border-box; 
    }
    
    html { 
      scroll-behavior: smooth; 
    }

    body {
      background-color: var(--bg-dark);
      color: var(--text-primary);
      line-height: 1.7;
      transition: var(--transition-smooth);
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 15% 50%, rgba(0, 170, 255, 0.05) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(255, 107, 107, 0.05) 0%, transparent 25%),
        radial-gradient(circle at 50% 80%, rgba(0, 255, 204, 0.05) 0%, transparent 25%);
      font-family: 'Poppins', 'Cairo', sans-serif;
    }

    /* Parallax Background */
    .parallax-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      background-image: 
        radial-gradient(circle at 20% 80%, rgba(0, 170, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 107, 107, 0.05) 0%, transparent 50%);
      transform: translateZ(0);
      pointer-events: none;
    }

    /* --- Header & Nav --- */
    #mainHeader {
      background: rgba(17, 22, 27, 0.95);
      color: var(--accent-color);
      padding: 15px 1rem;
      border-bottom: 1px solid rgba(20, 24, 31, 0.5);
      backdrop-filter: blur(10px);
      transition: var(--transition-smooth);
      display: flex;
      justify-content: center;
      align-items: center;
      height: 70px;
    }
    
    [data-theme="light"] #mainHeader {
      background: rgba(255, 255, 255, 0.95);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

    #mainHeader.scrolled {
      padding: 10px 1rem;
      box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    }

    .wrap {
      width: 100%;
      max-width: 1200px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .brand img {
      width: 36px;
      height: 36px;
      border-radius: 6px;
      background: rgba(255, 255, 255, 0.03);
      padding: 4px;
    }

    .brand .name {
      font-weight: 800;
      letter-spacing: 0.4px;
      font-size: 1.3em;
      background: var(--gradient-primary);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }

    .brand .small-meta {
      font-size: 0.7rem;
      color: var(--text-secondary);
    }

    nav.desktop {
      display: flex;
      gap: 12px;
      align-items: center;
    }

    nav.desktop a {
      color: var(--text-secondary);
      font-weight: 500;
      padding: 6px 10px;
      border-radius: 6px;
      transition: var(--transition-smooth);
      text-decoration: none;
      font-size: 0.9em;
    }

    nav.desktop a:hover, nav.desktop a:focus {
      color: var(--accent-color);
      background: rgba(255, 255, 255, 0.02);
    }

    nav.desktop a.active {
      color: var(--accent-color);
      background: rgba(0, 170, 255, 0.1);
    }

    .cta-primary, .cta-ghost {
      padding: 6px 12px;
      border-radius: 8px;
      font-weight: 700;
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
      font-size: 0.9em;
    }

    .cta-primary {
      background: var(--gradient-primary);
      color: var(--bg-dark);
    }

    .cta-ghost {
      border: 1px solid rgba(255, 255, 255, 0.1);
      color: var(--text-secondary);
      background: rgba(255, 255, 255, 0.02);
    }

    .cta-ghost:hover {
      background: rgba(255, 255, 255, 0.05);
      transform: translateY(-2px);
    }

    /* Hamburger Menu */
    .hamburger {
        display: none;
        flex-direction: column;
        background: none;
        border: none;
        cursor: pointer;
        padding: 5px;
        z-index: 1001;
    }

    .hamburger .bar {
        width: 22px;
        height: 2px;
        background-color: var(--accent-color);
        margin: 2.5px 0;
        transition: 0.3s;
        border-radius: 2px;
    }

    .hamburger.is-active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.is-active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.is-active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    /* Mobile Navigation */
    .mobile-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--bg-medium);
        backdrop-filter: blur(10px);
        display: flex;
        flex-direction: column;
        padding: 80px 20px 20px;
        transition: 0.5s;
        z-index: 999;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }

    .mobile-nav.is-active {
        right: 0;
    }

    .mobile-nav a {
        padding: 15px;
        text-decoration: none;
        color: var(--text-primary);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        transition: var(--transition-smooth);
        font-weight: 500;
    }

    .mobile-nav a:hover {
        color: var(--accent-color);
        background: rgba(0, 170, 255, 0.05);
    }

    /* --- Main Content --- */
    main {
      max-width: 800px;
      margin: 30px auto 80px;
      padding: 0 20px;
    }

    .article-content {
      line-height: 1.8;
      font-size: 1.1rem;
      color: var(--text-primary);
    }
    
    .article-header {
      margin-bottom: 40px; 
      text-align: center;
    }

    .article-content h1 {
      font-size: 2.3rem; 
      margin: 0 0 20px;
      color: var(--accent-color);
      text-shadow: 0 0 10px var(--neon-glow);
      line-height: 1.3;
    }

    .article-content h2 {
      font-size: 1.8rem;
      margin: 40px 0 20px;
      color: var(--accent-color);
      padding-bottom: 10px;
      border-bottom: 2px solid rgba(0, 170, 255, 0.2);
    }

    .article-content h3 {
      font-size: 1.4rem;
      margin: 30px 0 15px;
      color: var(--accent-tertiary);
    }

    .article-content p {
      margin-bottom: 20px;
      text-align: justify;
    }

    .article-content blockquote {
      border-left: 4px solid var(--accent-color);
      padding: 15px 20px;
      margin: 25px 0;
      background: rgba(0, 170, 255, 0.05);
      border-radius: 0 8px 8px 0;
      font-style: italic;
    }

    .article-content ul, .article-content ol {
      margin: 20px 0;
      padding-left: 30px;
    }

    .article-content li {
      margin-bottom: 10px;
    }

    .article-meta {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin: 10px 0 30px 0;
      display: flex;
      gap: 15px;
      align-items: center;
      flex-wrap: wrap;
    }

    .article-tag {
      background: rgba(0, 170, 255, 0.1);
      color: var(--accent-color);
      padding: 6px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
      display: inline-block;
    }

    .back-button {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--accent-color);
      text-decoration: none;
      font-weight: 600;
      margin-bottom: 30px;
      transition: var(--transition-smooth);
    }

    .back-button:hover {
      transform: translateX(-5px);
      color: var(--accent-hover);
    }

    .article-footer {
      margin-top: 50px;
      padding-top: 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .article-navigation {
      display: flex;
      justify-content: space-between;
      margin-top: 30px;
    }

    .nav-button {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 20px;
      background: var(--bg-light);
      border-radius: 10px;
      text-decoration: none;
      color: var(--text-primary);
      transition: var(--transition-smooth);
      border: 1px solid rgba(255, 255, 255, 0.05);
    }

    .nav-button:hover {
      background: var(--bg-medium);
      transform: translateY(-2px);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    }

    /* --- Footer --- */
    footer {
      background: var(--bg-medium);
      color: var(--text-secondary);
      padding: 30px 20px;
      margin-top: 60px;
      border-top: 1px solid var(--bg-light);
      position: relative;
    }

    footer::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 1px;
      background: var(--gradient-primary);
    }

    .footer-content {
      max-width: 1200px;
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 20px;
      flex-wrap: wrap;
    }

    /* --- Scroll Progress Bar --- */
    .progress-container {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: transparent;
      z-index: 1001;
    }
    
    .progress-bar {
      height: 100%;
      background: var(--gradient-primary);
      width: 0%;
      transition: width 0.3s ease;
    }

    /* --- Back to Top Button --- */
    .back-to-top {
      position: fixed;
      bottom: 30px;
      right: 30px;
      width: 50px;
      height: 50px;
      background: var(--gradient-primary);
      color: var(--bg-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2em;
      cursor: pointer;
      transition: var(--transition-smooth);
      opacity: 0;
      visibility: hidden;
      z-index: 999;
      box-shadow: 0 5px 15px rgba(0, 170, 255, 0.4);
    }
    
    .back-to-top.visible {
      opacity: 1;
      visibility: visible;
    }
    
    .back-to-top:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 170, 255, 0.6);
    }

    /* --- Theme Toggle --- */
    .theme-toggle {
      position: fixed;
      top: 15px;
      right: 15px;
      width: 40px;
      height: 40px;
      background: var(--bg-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      z-index: 1002;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
      transition: var(--transition-smooth);
    }
    
    .theme-toggle:hover {
      transform: rotate(30deg);
    }
    
    .theme-toggle i {
      font-size: 1.2em;
      color: var(--accent-color);
    }

    /* --- Notification Toast --- */
    .toast {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--bg-light);
      color: var(--text-primary);
      padding: 15px 25px;
      border-radius: 30px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
      z-index: 1003;
      display: flex;
      align-items: center;
      gap: 10px;
      opacity: 0;
      visibility: hidden;
      transition: var(--transition-smooth);
    }
    
    .toast.visible {
      opacity: 1;
      visibility: visible;
    }
    
    .toast i {
      color: var(--accent-color);
    }

    /* --- Responsiveness --- */
    @media (max-width: 768px) {
      #mainHeader {
        padding: 12px 1rem;
        height: 70px;
      }
      
      nav.desktop {
        display: none;
      }
      
      .hamburger {
        display: flex;
      }
      
      .brand .name {
        font-size: 1.3em;
      }
      
      .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 10px;
      }
      
      .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
      }
      
      .theme-toggle {
        top: 15px;
        right: 15px;
        width: 45px;
        height: 45px;
      }
      
      .article-navigation {
        flex-direction: column;
        gap: 15px;
      }
    }
    
    @media (max-width: 480px) {
      .mobile-nav {
        width: 85%;
      }
    }

    @supports (backdrop-filter: blur(10px)) {
      #mainHeader {
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
      }
    }

    #mainHeader * {
      box-sizing: border-box;
    }