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

        body {
            background: #0a0a0a;
            color: #ffffff;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 30px;
        }

        .logo {
            display: flex;
            align-items: center;
            font-size: 20px;
            font-weight: 600;
            color: #ffffff;
        }

        .logo::before {
            content: "📊";
            margin-right: 8px;
            font-size: 24px;
        }

        .back-link {
            color: #888;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.2s;
        }

        .back-link:hover {
            color: #fff;
        }

        .main-content {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .signup-container {
            background: #1a1a1a;
            border-radius: 12px;
            padding: 40px;
            width: 100%;
            max-width: 400px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }

        .title {
            font-size: 24px;
            font-weight: 600;
            text-align: center;
            margin-bottom: 30px;
            color: #ffffff;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-label {
            display: block;
            font-size: 14px;
            color: #888;
            margin-bottom: 6px;
        }

        .form-input {
            width: 100%;
            padding: 12px 16px;
            background: #2a2a2a;
            border: 1px solid #333;
            border-radius: 6px;
            color: #fff;
            font-size: 16px;
            transition: border-color 0.2s, background-color 0.2s;
        }

        .form-input:focus {
            outline: none;
            border-color: #4a9eff;
            background: #333;
        }

        .form-input::placeholder {
            color: #666;
        }

        .password-container {
            position: relative;
        }

        .password-toggle {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: #888;
            cursor: pointer;
            font-size: 18px;
            padding: 0;
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .password-toggle:hover {
            color: #fff;
        }

        .select-wrapper {
            position: relative;
        }

        .form-select {
            width: 100%;
            padding: 12px 16px;
            background: #2a2a2a;
            border: 1px solid #333;
            border-radius: 6px;
            color: #fff;
            font-size: 16px;
            cursor: pointer;
            appearance: none;
        }

        .select-wrapper::after {
            content: "▼";
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            color: #888;
            pointer-events: none;
            font-size: 12px;
        }

        .referral-section {
            margin: 20px 0;
        }

        .referral-link {
            color: #4a9eff;
            text-decoration: none;
            font-size: 14px;
        }

        .referral-link:hover {
            text-decoration: underline;
        }

        .captcha-container {
            display: flex;
            justify-content: center;
            margin: 20px 0;
            padding: 10px;
            background: #f9f9f9;
            border-radius: 6px;
        }

        .captcha-checkbox {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #333;
        }

        .captcha-checkbox input {
            width: 20px;
            height: 20px;
            cursor: pointer;
        }

        .login-link {
            text-align: center;
            margin: 20px 0;
        }

        .login-link a {
            color: #4a9eff;
            text-decoration: none;
            font-size: 14px;
        }

        .login-link a:hover {
            text-decoration: underline;
        }

        .create-btn {
            width: 100%;
            padding: 14px;
            background: linear-gradient(135deg, #4a9eff 0%, #007bff 100%);
            border: none;
            border-radius: 6px;
            color: white;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .create-btn:hover {
            transform: translateY(-1px);
            box-shadow: 0 8px 25px rgba(74, 158, 255, 0.3);
        }

        .create-btn:active {
            transform: translateY(0);
        }

        .chat-widget {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: #4a9eff;
            color: white;
            border: none;
            border-radius: 50%;
            width: 60px;
            height: 60px;
            font-size: 20px;
            cursor: pointer;
            box-shadow: 0 4px 20px rgba(74, 158, 255, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.2s;
        }

        .chat-widget:hover {
            transform: scale(1.1);
        }

        .chat-badge {
            position: absolute;
            top: -5px;
            right: -5px;
            background: #ff4757;
            color: white;
            border-radius: 50%;
            width: 24px;
            height: 24px;
            font-size: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
        }

        @media (max-width: 480px) {
            .signup-container {
                margin: 20px;
                padding: 30px 20px;
            }
            
            .header {
                padding: 15px 20px;
            }
        }