:root {
            --primary-neon: #00ffff;
            --secondary-neon: #ff0080;
            --accent-neon: #00ff41;
            --dark-bg: #0a0a0f;
            --card-bg: rgba(15, 15, 25, 0.9);
            --glass-bg: rgba(255, 255, 255, 0.05);
            --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            --success-color: #00ff41;
            --error-color: #ff4757;
            --warning-color: #ffa502;
        }

        * {
            box-sizing: border-box;
        }

        body {
            background: var(--dark-bg);
            background-image: 
                radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 40% 80%, rgba(120, 219, 226, 0.3) 0%, transparent 50%);
            min-height: 100vh;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            overflow-x: hidden;
            position: relative;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: 
                radial-gradient(2px 2px at 20px 30px, var(--primary-neon), transparent),
                radial-gradient(2px 2px at 40px 70px, var(--accent-neon), transparent),
                radial-gradient(1px 1px at 90px 40px, var(--secondary-neon), transparent);
            background-repeat: repeat;
            background-size: 100px 100px;
            animation: particleMove 20s linear infinite;
            opacity: 0.1;
            z-index: -1;
        }

        @keyframes particleMove {
            0% { transform: translate(0, 0); }
            100% { transform: translate(-100px, -100px); }
        }

        .form-container {
            background: var(--glass-bg);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 20px;
            padding: 2rem;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.1);
            position: relative;
            overflow: hidden;
            max-width: 450px;
            margin: 0 auto;
            animation: slideIn 0.8s ease-out;
        }

        @keyframes slideIn {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .logo {
            width: 80px;
            height: 80px;
            margin: 0 auto 2rem auto;
            background: var(--gradient-accent);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            font-weight: bold;
            color: white;
            text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
            box-shadow: 0 0 30px rgba(79, 172, 254, 0.5);
            animation: logoGlow 2s ease-in-out infinite alternate;
        }

        @keyframes logoGlow {
            from { box-shadow: 0 0 30px rgba(79, 172, 254, 0.5); }
            to { box-shadow: 0 0 50px rgba(79, 172, 254, 0.8); }
        }

        .main-title {
            background: var(--gradient-primary);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-align: center;
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 2rem;
            animation: titleGlow 3s ease-in-out infinite alternate;
        }

        @keyframes titleGlow {
            from { filter: drop-shadow(0 0 5px rgba(102, 126, 234, 0.5)); }
            to { filter: drop-shadow(0 0 15px rgba(118, 75, 162, 0.8)); }
        }

        /* Bootstrap Floating Label Overrides */
        .form-floating {
            position: relative;
        }

        .form-floating > .form-control {
            padding: 1.5rem 1rem;
            height: auto;
        }

        .form-floating > label {
            padding: 1.5rem 1rem;
            color: rgba(255, 255, 255, 0.5);
            border: 0;
        }

        .form-floating > .form-control:focus ~ label,
        .form-floating > .form-control:not(:placeholder-shown) ~ label {
            transform: scale(.85) translateY(-.75rem) translateX(.15rem);
            color: var(--primary-neon);
            background: var(--dark-bg);
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            height: auto;
        }

        .form-control {
            background: linear-gradient(145deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.08));
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            color: white;
            font-size: 1rem;
            font-weight: 500;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
        }

        .form-control:focus {
            background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.15));
            border-color: var(--primary-neon);
            box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
            color: white;
        }

        /* Styling for Select Dropdowns */
        select.form-control {
            -webkit-appearance: none; /* Remove default browser styling */
            -moz-appearance: none;
            appearance: none;
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%2300ffff' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
            background-repeat: no-repeat;
            background-position: right 0.75rem center;
            background-size: 16px 12px;
        }

        select.form-control option {
            background: var(--dark-bg);
            color: white;
        }

        .password-toggle {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: rgba(255, 255, 255, 0.5);
            cursor: pointer;
            z-index: 3;
        }

        .error-message {
            color: var(--error-color);
            font-size: 0.8rem;
            margin-top: 0.25rem;
            margin-left: 0.5rem;
        }

        .alert {
            border: none;
            border-radius: 12px;
            margin-bottom: 1rem;
            backdrop-filter: blur(10px);
        }

        .alert-success {
            background: rgba(0, 255, 65, 0.1);
            color: var(--success-color);
            border: 1px solid rgba(0, 255, 65, 0.3);
        }

        .alert-danger {
            background: rgba(255, 71, 87, 0.1);
            color: var(--error-color);
            border: 1px solid rgba(255, 71, 87, 0.3);
        }

        .btn-futuristic {
            background: var(--gradient-accent);
            border: none;
            border-radius: 12px;
            padding: 1rem 2rem;
            color: white;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            transition: all 0.3s ease;
            box-shadow: 0 10px 30px rgba(79, 172, 254, 0.3);
            width: 100%;
        }

        .btn-futuristic:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 40px rgba(79, 172, 254, 0.5);
        }

        .loading-spinner {
            display: none;
            margin-left: 0.5rem;
        }

        .spinner {
            width: 20px;
            height: 20px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-top: 2px solid white;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin { to { transform: rotate(360deg); } }

        .form-check-input {
            background-color: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.3);
        }

        .form-check-input:checked {
            background-color: var(--primary-neon);
            border-color: var(--primary-neon);
        }

        .signup-links {
            text-align: center;
            margin-top: 2rem;
        }

        .signup-links a {
            color: var(--primary-neon);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .signup-links a:hover {
            color: var(--accent-neon);
        }

        .theme-toggle {
            position: fixed;
            top: 20px;
            right: 20px;
            z-index: 1000;
        }

        /* Light theme adjustments */
        [data-bs-theme="light"] {
            --dark-bg: #f0f2f5;
            --card-bg: #ffffff;
            --primary-neon: #0d6efd;
            --accent-neon: #198754;
        }

        [data-bs-theme="light"] body {
            background: var(--dark-bg);
            color: #212529;
        }

        [data-bs-theme="light"] .form-container {
            background: var(--card-bg);
            backdrop-filter: none;
            border: 1px solid #dee2e6;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }

        [data-bs-theme="light"] .form-control {
            background: #f8f9fa;
            color: #212529;
            border: 1px solid #ced4da;
        }

        [data-bs-theme="light"] .form-control:focus {
            background: #fff;
            border-color: var(--primary-neon);
            box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
            color: #212529;
        }

        [data-bs-theme="light"] .form-floating > label {
            color: #6c757d;
        }

        [data-bs-theme="light"] .form-floating > .form-control:focus ~ label,
        [data-bs-theme="light"] .form-floating > .form-control:not(:placeholder-shown) ~ label {
            color: var(--primary-neon);
            background: #f8f9fa;
        }

        [data-bs-theme="light"] .password-toggle {
            color: #6c757d;
        }

        [data-bs-theme="light"] .main-title {
            background: linear-gradient(135deg, #0d6efd 0%, #6f42c1 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        [data-bs-theme="light"] select.form-control {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
        }

        [data-bs-theme="light"] select.form-control option {
            background: white;
            color: #212529;
        }

        .password-mask {
            -webkit-text-security: disc;
            text-security: disc;
        }