:root {
            --primary-color: #2563eb;
            --secondary-color: #1e40af;
            --bg-color: #f8fafc;
            --text-main: #1e293b;
            --text-light: #64748b;
            --white: #ffffff;
            --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            --transition: all 0.3s ease;
        }

        body {
            font-family: 'Tajawal', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-main);
            margin: 0;
            line-height: 1.6;
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
            padding: 20px;
        }

        h1.space {
            color: var(--primary-color);
            font-size: 2.5rem;
            margin-bottom: 5px;
            text-align: center;
            font-weight: 700;
        }

        sup {
            display: block;
            text-align: center;
            color: var(--text-light);
            font-size: 0.7rem;
            margin-bottom: 30px;
            letter-spacing: 1px;
        }

        .whitebox {
            background: var(--white);
            padding: 25px;
            border-radius: 12px;
            box-shadow: var(--shadow);
            margin-bottom: 20px;
            border: 1px solid #e2e8f0;
            transition: var(--transition);
        }

        .whitebox:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
        }

        h2 {
            color: var(--secondary-color);
            border-bottom: 2px solid #eff6ff;
            padding-bottom: 10px;
            margin-top: 0;
        }

        details {
            background: #f1f5f9;
            margin-bottom: 10px;
            padding: 12px 15px;
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
        }

        details[open] {
            background: #fff;
            border: 1px solid var(--primary-color);
        }

        summary {
            font-weight: 500;
            color: var(--secondary-color);
            outline: none;
        }

        details p {
            padding-top: 10px;
            font-size: 0.95rem;
            color: var(--text-main);
        }

        #download {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 30px;
        }

        @media (max-width: 768px) {
            #download { grid-template-columns: 1fr; }
        }

        .btn {
            display: inline-block;
            background: var(--primary-color);
            color: white !important;
            padding: 10px 20px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: bold;
            margin: 5px;
            transition: var(--transition);
            border: none;
            box-shadow: 0 4px 0px #1e40af;
        }

        .btn:hover {
            background: var(--secondary-color);
            transform: translateY(2px);
            box-shadow: 0 2px 0px #1e40af;
        }

        #Gbtn {
            background: #475569;
            box-shadow: 0 4px 0px #1e293b;
        }

        a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
        }

        a:hover {
            text-decoration: underline;
        }

        footer {
            background: #1e293b;
            color: #cbd5e1;
            padding: 30px;
            text-align: center;
            margin-top: 50px;
        }

        .hr-shadow {
            border: 0;
            height: 1px;
            background-image: linear-gradient(to right, rgba(255,255,255,0), rgba(255,255,255,0.75), rgba(255,255,255,0));
            margin: 20px 0;
        }

        nav {
            background: var(--white);
            box-shadow: var(--shadow);
            padding: 10px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        #download:target {
        animation: light-blink 1.5s ease-out;
        }

        @keyframes light-blink {
            0% { background-color: transparent; }
            50% { background-color: rgba(255, 235, 59, 0.3); }
            100% { background-color: transparent; }
        }