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

        body {
            font-family: 'Arial', sans-serif;
            background: linear-gradient(135deg, #0a0a0a 0%, #1a0d2e 25%, #16213e 50%, #0f3460 75%, #533483 100%);
            color: #ffffff;
            overflow-x: hidden;
            min-height: 100vh;
            position: relative;
        }

        /* Animated starfield background */
        .starfield {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
            pointer-events: none;
        }

        .star {
            position: absolute;
            width: 1px;
            height: 1px;
            background: white;
            border-radius: 50%;
            animation: twinkle 4s infinite ease-in-out;
        }

        @keyframes twinkle {
            0%, 100% { opacity: 0.3; transform: scale(1); }
            50% { opacity: 1; transform: scale(1.5); }
        }

        /* Floating cosmic particles */
        .cosmic-particle {
            position: fixed;
            width: 3px;
            height: 3px;
            background: radial-gradient(circle, #64ffda, transparent);
            border-radius: 50%;
            animation: float 20s infinite linear;
            z-index: 1;
        }

        @keyframes float {
            0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
            10% { opacity: 1; }
            90% { opacity: 1; }
            100% { transform: translateY(-100px) rotate(360deg); opacity: 0; }
        }

        .container {
            position: relative;
            z-index: 10;
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            text-align: center;
            margin-bottom: 40px;
            padding: 30px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 25px;
            backdrop-filter: blur(20px);
            border: 1px solid rgba(100, 255, 218, 0.2);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }

        .header h1 {
            font-size: 3.5rem;
            background: linear-gradient(45deg, #64ffda, #7c4dff, #ff4081, #ffab40);
            background-size: 400% 400%;
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            animation: gradientShift 3s ease-in-out infinite;
            margin-bottom: 15px;
            text-shadow: 0 0 50px rgba(100, 255, 218, 0.3);
        }

        @keyframes gradientShift {
            0%, 100% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
        }

        .subtitle {
            font-size: 1.3rem;
            color: #64ffda;
            margin-bottom: 20px;
            opacity: 0.9;
        }

        .date-selector {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 20px;
            margin: 30px 0;
            flex-wrap: wrap;
        }

        .date-input {
            padding: 12px 20px;
            background: rgba(100, 255, 218, 0.1);
            border: 2px solid rgba(100, 255, 218, 0.3);
            border-radius: 25px;
            color: white;
            font-size: 1.1rem;
            outline: none;
            transition: all 0.3s ease;
        }

        .date-input:focus {
            border-color: #64ffda;
            box-shadow: 0 0 20px rgba(100, 255, 218, 0.3);
            transform: scale(1.05);
        }

        .cosmic-btn {
            padding: 12px 25px;
            background: linear-gradient(45deg, #64ffda, #7c4dff);
            border: none;
            border-radius: 25px;
            color: white;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 1px;
            position: relative;
            overflow: hidden;
        }

        .cosmic-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(100, 255, 218, 0.4);
        }

        .cosmic-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.5s;
        }

        .cosmic-btn:hover::before {
            left: 100%;
        }

        .timeline-container {
            position: relative;
            margin: 40px 0;
        }

        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }

        .timeline::after {
            content: '';
            position: absolute;
            width: 4px;
            background: linear-gradient(to bottom, #64ffda, #7c4dff, #ff4081);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -2px;
            border-radius: 2px;
            box-shadow: 0 0 20px rgba(100, 255, 218, 0.5);
        }

        .timeline-event {
            padding: 10px 40px;
            position: relative;
            background-color: inherit;
            width: 50%;
            opacity: 0;
            transform: translateY(50px);
            transition: all 0.6s ease;
        }

        .timeline-event.animate {
            opacity: 1;
            transform: translateY(0);
        }

        .timeline-event::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            right: -10px;
            background: linear-gradient(45deg, #64ffda, #7c4dff);
            border-radius: 50%;
            top: 50%;
            transform: translateY(-50%);
            box-shadow: 0 0 15px rgba(100, 255, 218, 0.7);
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% { transform: translateY(-50%) scale(1); }
            50% { transform: translateY(-50%) scale(1.2); }
        }

        .timeline-event.right {
            left: 50%;
        }

        .timeline-event.right::after {
            left: -10px;
        }

        .event-content {
            padding: 25px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 20px;
            border: 1px solid rgba(100, 255, 218, 0.2);
            backdrop-filter: blur(10px);
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .event-content:hover {
            transform: scale(1.02);
            box-shadow: 0 20px 40px rgba(100, 255, 218, 0.2);
            border-color: rgba(100, 255, 218, 0.5);
        }

        .event-date {
            font-size: 1.1rem;
            color: #64ffda;
            font-weight: bold;
            margin-bottom: 10px;
        }

        .event-title {
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: #ffffff;
        }

        .event-description {
            color: #b3b3b3;
            line-height: 1.6;
            margin-bottom: 15px;
        }

        .event-significance {
            padding: 10px;
            background: rgba(100, 255, 218, 0.1);
            border-radius: 10px;
            border-left: 4px solid #64ffda;
            font-style: italic;
            color: #64ffda;
        }

        .cosmic-visualization {
            position: relative;
            height: 400px;
            background: radial-gradient(ellipse at center, rgba(100, 255, 218, 0.1) 0%, transparent 70%);
            border-radius: 20px;
            margin: 40px 0;
            overflow: hidden;
            border: 1px solid rgba(100, 255, 218, 0.2);
        }

        .planet {
            position: absolute;
            border-radius: 50%;
            animation: orbit 20s infinite linear;
        }

        .sun {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 80px;
            height: 80px;
            background: radial-gradient(circle, #ffab40, #ff5722);
            border-radius: 50%;
            transform: translate(-50%, -50%);
            box-shadow: 0 0 50px rgba(255, 171, 64, 0.6);
            animation: rotate 10s infinite linear;
        }

        @keyframes orbit {
            from { transform: rotate(0deg) translateX(150px) rotate(0deg); }
            to { transform: rotate(360deg) translateX(150px) rotate(-360deg); }
        }

        @keyframes rotate {
            from { transform: translate(-50%, -50%) rotate(0deg); }
            to { transform: translate(-50%, -50%) rotate(360deg); }
        }

        .earth {
            top: 50%;
            left: 50%;
            width: 30px;
            height: 30px;
            background: radial-gradient(circle, #4CAF50, #2196F3);
            transform-origin: 150px 0;
        }

        .mars {
            top: 50%;
            left: 50%;
            width: 25px;
            height: 25px;
            background: radial-gradient(circle, #FF5722, #D32F2F);
            transform-origin: 200px 0;
            animation-duration: 30s;
        }

        .stats-panel {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 40px 0;
        }

        .stat-card {
            background: rgba(255, 255, 255, 0.05);
            padding: 25px;
            border-radius: 15px;
            border: 1px solid rgba(100, 255, 218, 0.2);
            backdrop-filter: blur(10px);
            text-align: center;
            transition: all 0.3s ease;
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(100, 255, 218, 0.2);
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: bold;
            color: #64ffda;
            margin-bottom: 10px;
        }

        .stat-label {
            color: #b3b3b3;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .loading-animation {
            text-align: center;
            padding: 40px;
        }

        .cosmic-loader {
            width: 50px;
            height: 50px;
            border: 3px solid rgba(100, 255, 218, 0.3);
            border-top: 3px solid #64ffda;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto 20px;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        @media (max-width: 768px) {
            .timeline-event {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }

            .timeline-event.right {
                left: 0%;
            }

            .timeline::after {
                left: 31px;
            }

            .timeline-event::after {
                left: 21px;
            }

            .timeline-event.right::after {
                left: 21px;
            }

            .header h1 {
                font-size: 2.5rem;
            }

            .date-selector {
                flex-direction: column;
            }
        }