body {
            font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 0;
            background: #050505;
            color: #fff;
            transition: background-color .3s ease, color .3s ease;
        }
        .container {
            max-width: 800px;
            margin: 40px auto;
            padding: 20px;
            background: rgba(20, 20, 20, 0.6);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.05);
            border-radius: 20px;
            transition: background-color .3s ease, border-color .3s ease;
        }
        h1 { text-align: center; color: #f59e0b; }
        .form-group { margin-bottom: 20px; }
        label { display: block; margin-bottom: 5px; font-weight: bold; }
        input, textarea, select {
            width: 100%;
            padding: 10px;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            background: rgba(0, 0, 0, 0.3);
            color: white;
            font-size: 1rem;
            box-sizing: border-box;
        }
        textarea { height: 200px; resize: vertical; }
        .btn {
            display: inline-block;
            padding: 10px 20px;
            font-size: 1rem;
            font-weight: bold;
            color: #fff;
            background: linear-gradient(135deg, #6366f1, #a855f7);
            border: none;
            border-radius: 30px;
            cursor: pointer;
            text-decoration: none;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
        }
        
        .btn-transparent {
            position: relative;
            background: transparent !important;
            color: #fff !important;
            border: none !important;
            z-index: 1;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
        .btn-transparent::before, .theme-btn::before {
            content: "";
            position: absolute;
            top: 0; right: 0; bottom: 0; left: 0;
            border-radius: 30px;
            padding: 1.5px;
            background: linear-gradient(45deg, #00f3ff, #b5179e);
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            z-index: -1;
            pointer-events: none;
        }
        .btn-transparent:hover {
            transform: scale(1.05);
            box-shadow: 0 4px 20px rgba(0, 243, 255, 0.3);
        }

        .theme-btn {
            position: relative;
            z-index: 1;
            border: none !important;
            background: transparent !important;
            color: #fff !important;
            font-size: 1.5rem;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
        .theme-btn:hover {
            transform: scale(1.1);
            box-shadow: 0 4px 15px rgba(255, 193, 7, 0.2);
        }

        @media (max-width: 600px) {
            .container { margin: 20px 10px; padding: 15px; }
            .btn { width: 100%; margin: 5px 0; display: block; }
        }

        /* Light Mode */
        body.light-mode { background: #f4f7f6; color: #333; }
        body.light-mode .container { background: #fff; border-color: #ddd; }
        body.light-mode h1 { color: #333; }
        body.light-mode label { color: #333; }
        body.light-mode input, body.light-mode textarea, body.light-mode select { background: #f0f0f0; color: #333; border: 1px solid #ccc; }
        body.light-mode .theme-btn { color: #333 !important; }
        body.light-mode .btn-transparent { color: #333 !important; }

        /* Theme Dropdown Styles */
        .theme-dropdown-container { position: relative; display: inline-block; }
        .theme-dropdown { position: absolute; bottom: 100%; right: 0; background: rgba(20, 20, 20, 0.9); backdrop-filter: blur(20px); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 12px; padding: 10px; display: none; flex-direction: column; gap: 8px; z-index: 1000; min-width: 160px; box-shadow: 0 -10px 30px rgba(0,0,0,0.5); margin-bottom: 10px; }
        .theme-dropdown.show { display: flex; animation: slideUp 0.2s ease; }
        .theme-option { padding: 10px; border-radius: 8px; border: 1px solid rgba(255, 255, 255, 0.1); cursor: pointer; font-weight: bold; text-align: left; display: flex; align-items: center; gap: 10px; transition: transform 0.2s, box-shadow 0.2s; font-family: inherit; font-size: 0.9rem; }
        .theme-option:hover { transform: scale(1.05); }
        .theme-option.active { border: 2px solid #f59e0b; box-shadow: 0 0 12px rgba(245, 158, 11, 0.4); transform: scale(1.02); }

        /* 5 New Futuristic Themes */
        body.cyberpunk-mode { background: radial-gradient(circle at top right, #501b87, #130321); color: #e2e8f0; }
        body.cyberpunk-mode .container { border-color: rgba(255, 0, 124, 0.2); }
        body.cyberpunk-mode .btn { background: linear-gradient(135deg, #f72585, #4361ee); box-shadow: 0 4px 15px rgba(247, 37, 133, 0.3); }
        body.matrix-mode { background: radial-gradient(circle at top, #004d00, #021a02); color: #e2e8f0; }
        body.matrix-mode .container { border-color: rgba(0, 255, 65, 0.2); }
        body.matrix-mode .btn { background: linear-gradient(135deg, #00b4d8, #00ff41); box-shadow: 0 4px 15px rgba(0, 255, 65, 0.3); color: #000; }
        body.ocean-mode { background: radial-gradient(circle at top left, #005f8a, #011b2e); color: #e2e8f0; }
        body.ocean-mode .btn { background: linear-gradient(135deg, #0077b6, #00b4d8); box-shadow: 0 4px 15px rgba(0, 119, 182, 0.3); }
        body.dracula-mode { background: #32354b; color: #f8f8f2; }
        body.dracula-mode .btn { background: linear-gradient(135deg, #bd93f9, #ff79c6); box-shadow: 0 4px 15px rgba(189, 147, 249, 0.3); }
        body.solar-mode { background: radial-gradient(circle at center, #6b1426, #1a0a24); color: #e2e8f0; }
        body.solar-mode .btn { background: linear-gradient(135deg, #dc2f02, #ffba08); box-shadow: 0 4px 15px rgba(220, 47, 2, 0.3); }
        
        /* Toast Notification */
        #toast-container { position: fixed; top: 20px; right: 20px; z-index: 9999; display: flex; flex-direction: column; gap: 10px; }
        .toast { background: #222; color: white; padding: 15px 20px; border-radius: 12px; box-shadow: 0 4px 12px rgba(0,0,0,0.5); display: flex; align-items: center; gap: 10px; opacity: 0; transform: translateX(100%); transition: all 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55); min-width: 250px; max-width: 350px; }
        .toast.show { opacity: 1; transform: translateX(0); }
        .toast.success { border-left: 5px solid #10b981; }
        .toast.error { border-left: 5px solid #ef4444; }
        .toast.info { border-left: 5px solid #6366f1; }
        .toast-icon { font-size: 1.2rem; }
        body.light-mode .toast { background: #fff; color: #333; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }