/* Custom Styles & Design Enhancements */
        :root {
            --bg-dark: #020412;
            --bg-space: #0a1128;
            --bg-nebula: #1a2a44;
            --accent-gold: #f5b94f;
            --accent-gold-darker: #e0a84a;
            --text-light: #e0e0e0;
            --text-gray: #d1d5db;
        }

        html { scroll-behavior: smooth; }
        body {
            font-family: 'Cairo', sans-serif;
            background-color: var(--bg-dark);
            color: var(--text-light);
            overflow-x: hidden;
            background: linear-gradient(-45deg, var(--bg-dark), var(--bg-space), var(--bg-nebula), var(--bg-dark));
            background-size: 400% 400%;
            animation: gradientBG 25s ease infinite;
        }

        @keyframes gradientBG {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }
        
        #star-canvas {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
        }
        
        /* Custom Colors & Shadows */
        .text-accent { color: var(--accent-gold); }
        .shadow-accent { box-shadow: 0 0 25px rgba(245, 185, 79, 0.6), 0 0 10px rgba(245, 185, 79, 0.8) inset; }
        .shadow-accent-light { box-shadow: 0 0 15px rgba(245, 185, 79, 0.5); }

        /* --- Scrollbar Styling --- */
        ::-webkit-scrollbar { width: 8px; }
        ::-webkit-scrollbar-track { background: var(--bg-space); }
        ::-webkit-scrollbar-thumb { background: var(--accent-gold); border-radius: 10px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--accent-gold-darker); }

        /* --- Loader --- */
        #loader {
            position: fixed; top: 0; left: 0; width: 100%; height: 100%;
            background-color: var(--bg-dark); z-index: 9999; display: flex;
            justify-content: center; align-items: center;
            transition: opacity 0.7s ease-out, visibility 0.7s;
        }
        .logo-loader {
            width: 120px; height: 120px; color: var(--accent-gold);
            animation: pulse-loader 2.5s infinite ease-in-out;
        }
        @keyframes pulse-loader {
            0% { transform: scale(0.95); opacity: 0.7; }
            50% { transform: scale(1.05); opacity: 1; }
            100% { transform: scale(0.95); opacity: 0.7; }
        }

        /* --- Glassmorphism Modal --- */
        #modal-backdrop {
            position: fixed; top: 0; left: 0; width: 100%; height: 100%;
            background-color: rgba(0,0,0,0.5); backdrop-filter: blur(10px);
            z-index: 100; opacity: 0; visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s;
        }
        #modal-backdrop.visible { opacity: 1; visibility: visible; }
        #modal-content {
            position: fixed; top: 50%; left: 50%;
            transform: translate(-50%, -50%) scale(0.9);
            background: rgba(26, 42, 68, 0.6);
            border: 1px solid rgba(245, 185, 79, 0.3);
            backdrop-filter: blur(20px);
            border-radius: 1rem;
            box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
            transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
        }
        #modal-backdrop.visible #modal-content { transform: translate(-50%, -50%) scale(1); }
        #modal-body ul { list-style-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5b94f' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m9 18 6-6-6-6'/%3E%3C/svg%3E"); }


        /* --- ENHANCED Planet Styles --- */
        @keyframes subtle-pulse {
            0% { box-shadow: inset -10px -10px 20px rgba(0,0,0,0.2), 0 0 15px var(--planet-color), 0 0 5px var(--planet-color) inset; }
            50% { box-shadow: inset -10px -10px 20px rgba(0,0,0,0.2), 0 0 25px var(--planet-color), 0 0 8px var(--planet-color) inset, 0 0 30px rgba(255, 255, 255, 0.2); }
            100% { box-shadow: inset -10px -10px 20px rgba(0,0,0,0.2), 0 0 15px var(--planet-color), 0 0 5px var(--planet-color) inset; }
        }
        
        @keyframes gentle-bob {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-10px); }
        }

        .planet-container {
            display: flex; flex-direction: column; align-items: center;
            gap: 1rem; cursor: pointer;
            transition: transform 0.3s ease;
            animation: gentle-bob 6s infinite ease-in-out;
            position: relative; 
        }
        
        .planet-container:hover {
            animation-play-state: paused;
        }

        .planet {
            border-radius: 50%; position: relative;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            animation: subtle-pulse 4s infinite ease-in-out;
            background-color: var(--planet-color);
            background-image: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.8), rgba(255,255,255,0) 70%);
            overflow: hidden; 
        }

        .planet-name {
            color: var(--text-gray); font-weight: 600; font-size: 0.9rem;
            text-align: center; transition: all 0.3s ease; 
        }
        
        .planet-container:hover .planet {
            transform: scale(1.1);
        }
        .planet-container:hover .planet-name {
            transform: translateY(15px); 
            z-index: 10; 
        }

        .planet-container:hover .planet {
            box-shadow: inset -10px -10px 20px rgba(0,0,0,0.2), 0 0 40px var(--planet-color), 0 0 20px var(--accent-gold) inset;
        }
        .planet-container:hover .planet-name {
            color: var(--accent-gold); text-shadow: 0 0 10px rgba(245, 185, 79, 0.7);
        }

        .planet-container.has-ring::before {
            content: ''; position: absolute; 
            top: 48px; /* Half of planet height (96px) */
            left: 50%;
            width: 154px; /* 96px * 1.6 */
            height: 154px; /* 96px * 1.6 */
            border-radius: 50%;
            border: 3px solid rgba(245, 185, 79, 0.4);
            box-shadow: 0 0 15px rgba(245, 185, 79, 0.3), inset 0 0 5px rgba(245, 185, 79, 0.2);
            transform: translate(-50%, -50%) rotateX(75deg) rotateZ(-10deg);
            transition: transform 0.4s ease;
        }

        @media (min-width: 768px) {
             .planet-container.has-ring::before {
                 top: 64px; /* Half of desktop planet height (128px) */
                 width: 205px; /* 128px * 1.6 */
                 height: 205px; /* 128px * 1.6 */
             }
        }

        .planet-container:hover.has-ring::before {
            transform: translate(-50%, -50%) rotateX(75deg) rotateZ(5deg) scale(1.05);
        }
        
        /* Styles for the Prep Helper Moon */
        .prep-helper-moon .planet {
            background-color: #e0e0e0;
            --planet-color: #e0e0e0;
            background-image: radial-gradient(circle at 30% 30%, rgba(255,255,255,1), rgba(255,255,255,0) 80%);
        }
        .prep-helper-moon.has-ring::before {
            border-color: rgba(224, 224, 224, 0.4);
            box-shadow: 0 0 15px rgba(224, 224, 224, 0.3), inset 0 0 5px rgba(224, 224, 224, 0.2);
        }

        /* ✨ NEW: Larger styles for the dedicated Prep Helper Moon section */
        #prep-helper-display .planet {
            width: 144px; /* 36 * 4 */
            height: 144px;
        }
        #prep-helper-display .planet-container.has-ring::before {
            top: 72px; /* half of 144px */
            width: 230px; /* 144 * 1.6 */
            height: 230px;
        }

        @media (min-width: 768px) {
            #prep-helper-display .planet {
                width: 192px; /* 48 * 4 */
                height: 192px;
            }
            #prep-helper-display .planet-container.has-ring::before {
                top: 96px; /* half of 192px */
                width: 307px; /* 192 * 1.6 */
                height: 307px;
            }
        }
        
        /* Moon Craters */
        .moon-crater {
            position: absolute;
            border-radius: 50%;
            background-color: rgba(0,0,0,0.1);
            box-shadow: inset 1px 1px 4px rgba(0,0,0,0.2);
        }
        .crater-1 { top: 20%; left: 55%; width: 25%; height: 25%; }
        .crater-2 { top: 50%; left: 20%; width: 18%; height: 18%; }
        .crater-3 { top: 65%; left: 65%; width: 15%; height: 15%; }


        @media (min-width: 768px) {
            .orbiting-planet {
                position: absolute;
                transition: top 0.5s ease, left 0.5s ease;
            }
        }


        /* --- Scroll-triggered Animations --- */
        .fade-in-section {
            opacity: 0;
            transform: translateY(40px);
            transition: opacity 0.8s ease-out, transform 0.8s ease-out;
        }
        .fade-in-section.is-visible {
            opacity: 1;
            transform: translateY(0);
        }
        
        /* --- Hero Section Intro Animations --- */
        .hero-logo { animation: fade-in-down 1.2s cubic-bezier(0.165, 0.84, 0.44, 1) 0.2s both; }
        .hero-title { animation: fade-in-up 1.2s cubic-bezier(0.165, 0.84, 0.44, 1) 0.4s both; }
        .hero-subtitle { animation: fade-in-up 1.2s cubic-bezier(0.165, 0.84, 0.44, 1) 0.6s both; }
        .hero-button { animation: fade-in-up 1.2s cubic-bezier(0.165, 0.84, 0.44, 1) 0.8s both; }

        @keyframes fade-in-down {
            from { opacity: 0; transform: translateY(-30px) scale(0.9); }
            to { opacity: 1; transform: translateY(0) scale(1); }
        }
        @keyframes fade-in-up {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        /* IMPROVED Hero Button */
        .hero-button {
            position: relative;
            overflow: hidden;
            background: linear-gradient(45deg, var(--accent-gold), var(--accent-gold-darker));
        }
        .hero-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 50%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
            transform: skewX(-25deg);
            transition: left 0.7s ease;
        }
        .hero-button:hover::before {
            left: 150%;
        }

        /* Thematic footer */
        footer {
            position: relative;
        }
        footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100px;
            background: linear-gradient(to top, rgba(10, 17, 40, 0.4), transparent);
            z-index: -1;
            pointer-events: none;
        }