:root {
            --space-blue: #00d4ff;
            --nebula-purple: #8b5cf6;
            --star-gold: #fbbf24;
            --mars-red: #ef4444;
            --space-black: #0a0a0f;
            --space-dark: #1a1a2e;
            --surface: rgba(0, 212, 255, 0.08);
            --text: #e2e8f0;
            --text-dim: #94a3b8;
            --radius: 12px;
        }

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

        body {
            font-family: 'Inter', sans-serif;
            background: var(--space-black);
            color: var(--text);
            line-height: 1.6;
            min-height: 100vh;
            position: relative;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background:
                radial-gradient(2px 2px at 20px 30px, var(--space-blue), transparent),
                radial-gradient(3px 3px at 200px 100px, var(--star-gold), transparent),
                radial-gradient(1px 1px at 90px 40px, var(--nebula-purple), transparent);
            background-size: 400px 300px;
            animation: cosmicDrift 40s linear infinite;
            opacity: 0.15;
            z-index: -1;
        }
		

        @keyframes cosmicDrift {
            0% {
                transform: translateY(0) translateX(0);
            }

            100% {
                transform: translateY(-300px) translateX(-200px);
            }
        }

        .hero {
            background: linear-gradient(135deg, var(--space-black), var(--space-dark));
            padding: 4rem 2rem;
            text-align: center;
            border-bottom: 1px solid rgba(0, 212, 255, 0.2);
        }

        .hero h1 {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, var(--space-blue), var(--nebula-purple), var(--star-gold));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            font-size: 1.2rem;
            color: var(--text-dim);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 3rem 2rem;
        }

        .calculator-grid {
            display: grid;
            grid-template-columns: 400px 1fr;
            gap: 3rem;
        }

        .panel {
            background: var(--surface);
            backdrop-filter: blur(15px);
            border-radius: var(--radius);
            padding: 2rem;
            border: 1px solid rgba(0, 212, 255, 0.2);
        }

        .panel h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .destination-grid {
            display: grid;
            gap: 0.75rem;
            margin-bottom: 2rem;
            max-height: 400px;
            overflow-y: auto;
        }

        .destination-option {
            background: var(--space-dark);
            border: 2px solid transparent;
            border-radius: var(--radius);
            padding: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .destination-option:hover,
        .destination-option.active {
            border-color: var(--destination-color);
            box-shadow: 0 0 20px rgba(var(--destination-rgb), 0.3);
        }

        .destination-icon {
            font-size: 1.5rem;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            color: var(--destination-color);
        }

        .destination-info h3 {
            font-weight: 600;
            margin-bottom: 0.25rem;
        }

        .destination-info p {
            font-size: 0.875rem;
            color: var(--text-dim);
        }

        .propulsion-dropdown select {
            width: 100%;
            background: var(--space-dark);
            color: var(--text);
            border: 1px solid rgba(0, 212, 255, 0.2);
            border-radius: var(--radius);
            padding: 0.75rem;
            font-size: 1rem;
            margin-bottom: 1rem;
        }

        /* Table styling */
        table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 1rem;
        }

        th {
            background: rgba(0, 212, 255, 0.1);
            text-align: left;
            padding: 0.75rem;
            font-weight: 600;
        }

        td {
            padding: 0.75rem;
            border-bottom: 1px solid rgba(0, 212, 255, 0.1);
        }

        tr:last-child td {
            border-bottom: none;
        }

        /* Share Button Styles */
         /* ADDED: Premium Modal Styles */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(10, 10, 15, 0.8);
            backdrop-filter: blur(5px);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
            padding: 1rem;
        }

        .modal-content {
            background: var(--space-dark);
            border: 1px solid #1e293b; /* --space-blue-dark */
            border-radius: 1rem; /* --radius-lg */
            padding: 2rem;
            max-width: 550px;
            width: 100%;
            box-shadow: 0 10px 40px rgba(0, 212, 255, 0.2);
            position: relative;
            color: var(--text-light);
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #1e293b; /* --space-blue-dark */
        }

        .modal-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--star-gold);
            text-shadow: 0 0 10px var(--star-gold);
        }

        .modal-close {
            background: transparent;
            border: none;
            color: var(--text-dim);
            font-size: 2.5rem;
            line-height: 1;
            cursor: pointer;
            transition: color 0.2s ease;
        }

        .modal-close:hover {
            color: var(--mars-red);
        }

        .modal-body {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .image-preview-container {
            border: 1px dashed var(--space-blue);
            padding: 0.5rem;
            border-radius: var(--radius);
            background: rgba(0,0,0,0.2);
        }

        .image-preview {
            width: 100%;
            border-radius: 4px; /* --radius-sm */
            aspect-ratio: 1200 / 630;
            object-fit: cover;
        }

        .share-prompt {
            font-size: 1rem;
            color: var(--text-dim);
            text-align: center;
            margin: 0;
        }

        .share-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
            gap: 1rem;
        }

        .modal-share-button {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 1rem 0.5rem;
            background-color: #1e293b; /* --space-blue-dark */
            border: 1px solid transparent;
            border-radius: var(--radius);
            color: var(--text-light);
            font-size: 0.875rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease-in-out;
        }

        .modal-share-button:hover {
            background-color: var(--space-blue);
            border-color: var(--star-gold);
            transform: translateY(-3px);
            box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
        }

        .modal-share-icon {
            font-size: 2rem;
            line-height: 1;
        }

        .copy-link-section {
            display: flex;
            gap: 0.5rem;
            margin-top: 1rem;
        }

        .copy-link-input {
            flex-grow: 1;
            background-color: #0a0a0f;
            border: 1px solid #1e293b; /* --space-blue-dark */
            border-radius: 4px; /* --radius-sm */
            color: var(--text-dim);
            padding: 0.5rem 0.75rem;
            font-family: 'Inter', sans-serif;
            font-size: 0.875rem;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .copy-link-button {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            background-color: var(--space-blue);
            color: #fff;
            border: none;
            border-radius: 4px; /* --radius-sm */
            padding: 0.5rem 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.2s ease;
        }

        .copy-link-button:hover {
            background-color: #3b82f6; /* Lighter blue */
        }

        .copy-link-button:disabled {
            background-color: #16a34a; /* Green for success */
            cursor: default;
        }

        /* UPDATED: Premium Share Button Style */
        .share-button.premium {
            display: inline-flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.75rem 1.5rem;
            background: linear-gradient(45deg, var(--star-gold), var(--nebula-purple));
            color: white;
            font-weight: 700;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
            font-size: 1rem;
            margin-top: 1rem;
            width: 100%;
            justify-content: center;
        }

        .share-button.premium:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 6px 20px rgba(251, 191, 36, 0.5);
        }

        .share-button.premium .share-icon {
            font-size: 1.25rem;
        }

        /* Hidden canvas for image generation */
        #shareCanvas {
            display: none;
        }

        .distance-note {
            font-size: 0.8rem;
            color: var(--text-dim);
            margin-top: 0.5rem;
            font-style: italic;
        }

        @media (max-width: 1024px) {
            .calculator-grid {
                grid-template-columns: 1fr;
            }
        }